JP6374830B2 - Seal ring - Google Patents

Description

  The present invention relates to a seal ring.

  Conventionally, it has a generally annular overall shape with a cut at one circumference, has a ring main body, a first convex part and a second convex part that protrude in the circumferential direction from both ends of the ring main body, and is compressed A seal ring for sealing between the movable scroll of the machine and the housing is known, and the material thereof is mainly PTFE (polytetrafluoroethylene) (see, for example, Patent Document 1 and Patent Document 2).

JP 2007-247526 A JP-A-8-276508

A conventional seal ring of this type has been manufactured by first mechanically cutting a cylindrical PTFE material and then machining such as cutting, grinding, and cutting.
Therefore, the conventional ones have the disadvantages that the number of processing steps such as machining is increased, the material loss is increased, and the manufacturing cost is high.

  On the other hand, manufacturing by injection molding is possible, but in that case, the sealing performance at the joint portion of the first convex portion and the second convex portion is lowered, and the amount of fluid (oil) leakage from the joint portion is excessive. There was a drawback. In the rocking test, it was confirmed that the amount of fluid (oil) leakage was significantly larger than that of the PTFE seal ring. It is not preferable from the viewpoint of the function of the compressor that the fluid leakage from the seal portion is extremely increased. Further, as the frictional resistance of the sliding contact surface that is in sliding contact with the sealed surface of the movable scroll or the housing increases, the sliding at the time of swing becomes unstable, and the joint portion of the first convex portion and the second convex portion This is a factor that increases the amount of fluid leakage by changing the seal gap.

  Therefore, an object of the present invention is to provide a seal ring that can be manufactured at low cost by injection molding of a thermoplastic resin composition and that can reduce the amount of fluid leakage from the joint portion. In particular, a seal ring suitable for a compressor that performs scrolling motion is provided.

The seal ring according to the present invention is formed in an annular overall shape having a cut at one place on the circumference, and is attached to the ring body and extending in the circumferential direction from the first end and the second end of the ring body. at a sealing ring having a first convex portion, second convex portion that is entirely formed integrally of a thermoplastic resin composition, cross-sectional shape of the ring body, and the movable target sealing surface With respect to one corner of the basic rectangle corresponding to the corner with the fixed-side sealed surface, the other corner of the basic rectangle as a diagonal is notched to form a notch, and the first protrusion and the first The two convex portions are obtained by dividing the cross section of the ring main body having the cross-sectional shape having the cutout portion into two by a separation line so that the first corresponding surface and the second corresponding surface face each other. Is a cross-sectional shape in which a continuous cut-out portion is formed in the notch of the ring body, and the first convex The second convex portion at a break closed state overlapping with each other, the first protrusion and the second protrusion is set to a dimension that does not protrude from the basic rectangle with.

Further, the first slidable contact surface on which the ring main body is slidably contacted with the movable-side sealed surface includes a shallow groove-shaped notch for reducing frictional resistance.
Further, the first sliding contact surface on which the ring main body slides on the movable-side sealed surface is formed by coating with a material having a low friction coefficient so as to reduce the frictional resistance.

  The ring body in the open state has a portion with a maximum radius of curvature within a range of 180 ° ± 30 ° with respect to the center point of the cut, and the first end portion extends from the portion with the maximum size. -It is set so that the radius of curvature decreases as it approaches the circumferential direction toward each of the second end portions, and the overall shape is in a closed state in which the first convex portion and the second convex portion overlap each other. Is configured to be a true circle.

  According to the seal ring of the present invention, the sealing performance at the joint portion of the first convex portion and the second convex portion can be improved, and fluid leakage can be reduced. By injection molding of the thermoplastic resin composition, the dimensions can be easily set, and a high-quality and high-performance seal ring can be obtained easily and inexpensively. Machining such as cutting / grinding / cutting can be omitted, material loss is reduced, and manufacturing can be performed at low cost. In particular, it is possible to provide a seal ring suitable for a compressor that performs a scrolling motion.

It is a compressor sectional view which illustrated the use of the seal ring concerning the present invention concretely. It is the expanded sectional view which showed the reference example deeply related to this invention, and showed the use location. It is a top view of a break open state. It is a front view of a cut open state (illustrated with a part of the rear portion omitted). It is a top view of a break closed state. It is a front view of a break closed state. It is an expanded sectional view showing a modification of ring main part 1. It is BB expanded sectional drawing of FIG. It is CC sectional drawing of FIG. 4, and an expanded sectional view which shows a modification. It is DD expanded sectional drawing of FIG. 6, and an expanded sectional view which shows a modification. It is a principal part expanded sectional view which shows a pressure receiving state. It is sectional drawing which showed the other reference example of this invention. It is a top view of a break closed state. It is a principal part enlarged plan view. It is a top view of the break closed state which showed the modification of the other reference example of this invention. It is sectional drawing which showed another reference example of this invention. It is sectional drawing which showed another reference example of this invention. It is a sectional view showing the various embodiments of the present onset bright. It is a sectional view showing another embodiment of the present onset bright. Modification with another embodiment of the present onset bright is a sectional view showing the. It is principal part sectional drawing for demonstrating a various modification. It is principal part sectional explanatory drawing which shows another modification.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
As shown in FIGS. 3 and 4, the seal ring S of the present invention has an annular overall shape having a cut 5 at one place in the circumference in a free state. The seal ring S includes a ring main body 1 occupying a central angle slightly smaller than 360 °, and a first convex portion extending in a circumferential direction from the first end portion 11 and the second end portion 12 of the ring main body 1. 21. A second convex portion 22 is attached.
FIGS. 1 and 2 show the state of use, and exemplifies a case where the present invention is applied to a scroll compression mechanism 3 of a compressor 2 for an air conditioner.

The scroll compression mechanism 3 mainly includes a housing 4, a fixed scroll 6 disposed in close contact with the upper side of the housing 4, and a movable scroll 7 that meshes with the fixed scroll 6. In the housing 4, a seal groove 4 </ b> B is formed in a flat surface portion 4 </ b> A facing the lower surface (back surface) 7 </ b> A of the movable scroll 7, and the seal ring S of the present invention is inserted in the seal groove 4 </ b> B.
The seal ring S seals between the back surface 7A of the movable scroll 7 and the flat portion 4A of the housing 4 to form a back pressure space. (FIG. 2 is an enlarged view of a Y portion in FIG. 1.)

  And as shown in FIG. 3 and FIG. 4, it forms integrally with the thermoplastic resin composition in the whole shape which the cut | interruption 5 is an open state. In FIG. 3, arrow F indicates the injection direction of the molten resin at the time of injection molding, 10 is an injection gate (trace) portion, and even if it is cut as beautifully as possible with a cutting blade (not shown), There is a possibility that minute protrusions may remain, and machining such as grinding may be performed for finishing. However, except for such an injection gate trace portion 10, machining can be omitted to form an injection molding surface.

  As a thermoplastic resin composition suitable for injection molding the seal ring S of the present invention, a PES resin composition may be mentioned. The injection-molded product has the advantage that so-called burrs are less likely to occur. Furthermore, the thermal expansion coefficient is low, the shrinkability after taking out from the mold is low, and the size of the seal ring S is maintained with high accuracy, so There is an advantage that it can be omitted.

Then, as shown in FIG. 3, the cut line 5 is integrally formed with a thermoplastic resin composition such as a PES resin composition in the entire shape in the open state, but the cut line 5 taken out from the injection mold. The ring body 1 of the seal ring S in the open state has a portion 13 having the maximum radius of curvature R ₁₃ (maximum size) on the side opposite to the cut 5, and the first end from the portion 13 having the maximum dimension. The curvature radii R ₁ and R ₂ gradually decrease toward the respective portions 11 and 2 toward the circumferential directions M ₁ and M ₂ , and the first end portion 11 and the second end portion 12. The radius of curvature R ₁₁ , R ₁₂ of the first convex portion 21 and the second convex portion 22 (which are small projecting dimensions) are set to be the minimum dimension, and the curvature radius of the outer peripheral surface of the first convex portion 21 and the second convex portion 22 is R ₁₁ , Same as ₁₂ .
The curvature radii R ₁₃ , R ₁ , R ₂ , R ₁₁ , R ₁₂ are the dimensions from the center point O ₁ to the outer peripheral surface of the ring body 1 as shown in FIG.

Further, in addition, in the plan view of FIG. 3, the ring body 1 in the open state has a maximum dimension within a range of 180 ° ± 30 ° with respect to the central point (center point) P ₅ of the cut 5. The site | part 13 exists. That is, θ shown in FIG. 3 is 30 °, and the portion 13 having the maximum dimension is disposed in the range of 2θ = 60 °. (In FIG. 3, L ₀ is a line indicating the diameter including the center point P _5. )

As described above, the shape and size of the cavity of the mold and the seal ring S (see FIG. 3) taken out from the cavity have an outer peripheral edge shape of ± θ (= ± on the opposite side of 180 ° with respect to the cut 5. A portion 13 having a maximum radius of curvature R ₁₃ is disposed within a range of 30 °), and is set to a non-circular shape that gradually decreases from this portion 13 toward the cut 5.
In the state of use --- the state of being attached to the seal groove 4B as shown in FIG .---- the first convex portion 21 and the second convex portion 22 overlap each other, and the cut is closed, but the cut is opened. Due to the non-circular shape described above under the state, it becomes a true circular shape with the same radius of curvature R ₀ from the center point O ₁ due to the elastic deformation, and the inside of the seal groove 4B shown in FIG. Close contact with the wall surface 14. When deformed from the cut open state (FIG. 3) to the cut closed state (FIG. 5), the portion 13 having the largest dimension is deformed so that the radius of curvature is the largest, and the first end portion 11 and the second end portion 12 side. Hardly deforms. Accordingly, the curvature radius R ₀ shown in FIG. 5 is equal to the curvature radii R ₁₁ and R ₁₂ of the end portions 11 and 12 shown in FIG.

The cross-sectional shape of the ring main body 1 is a rectangular shape as an example. In the present invention, the “rectangular shape” includes, of course, the squares and rectangles shown in FIGS. 2, 9 (A), 10 (A), etc. As shown in FIG. 10B, one corner ₁₅ is chamfered from the basic rectangle G by an inclined straight line L ₁₅ , and one of the remaining corners other than the corner 15 is omitted although not shown. In addition, it includes a polygonal shape in which all or part of the surface is chamfered, and includes a shape having a shallow groove-like notch 29 as shown in FIGS. 12 to 16 and 18, and FIGS. ) Is defined to include a shape having the small rounded portion 35 shown in (1) in at least one of the four corners.
In the state of use shown in FIG. 2, the first sliding contact surface 26 slidably contacting the (movable side) sealed surface (plane) P ₁ such as the back surface 7A of the movable scroll 7 and the inner wall surface 14 of the seal groove 4B (fixed) Side) and a _second sliding contact surface 27 that is in sliding contact with the sealed surface (curved surface) P2. It is pressed against the corner 8 formed by the orthogonal sealed surfaces P ₁ and P ₂ when receiving pressure.

By the way, the present invention adopts a thermoplastic resin composition such as a PES resin composition, so that the cross section shown in FIG. 2 or the like is made square or rectangular (even if chamfering is omitted), or during the scroll motion. There is an advantage that the corner portion 15 of the seal ring S does not cause a problem such as biting into the gap 9 between the back surface 7A and the flat surface portion 4A. However, it is sometimes preferable to form the chamfered portion 16 shown in FIG. 7 or the like in consideration of severe conditions of use such as pressure, temperature, motion speed / operation direction, and fluid characteristics. By adding describes cross-sectional shape formed with the chamfered portion 16, as shown in FIG. 7, the one corner portion 15 from the basic rectangle G shown in two-dot chain line is chamfered by the inclined shape linear L _15. (FIG. 7 illustrates C chamfering.)

As shown in FIG. 8, the first convex portion 21 includes a first contact piece portion 31 having one corner portion 19 of the basic rectangle G adjacent to the one corner portion 15 (shown in FIG. 7), and the other It has the 2nd contact piece part 32 which has the corner | angular part 17, and the 1st contact piece part 31 and the inclined piece part 30 which connects the 2nd contact piece part 32 (thin-wall shape).
The 1st convex part 21 is formed in the cross-sectional shape [the shape (tortoise bracket shape) bent at two places. The inclined piece 30 has an inclined corresponding surface 23 on the outer side of the turtle bracket ([), and a recess 33 having a bottom surface 25 on the inner side. Thickness T ₁ of the inclined projection 30 and, at the same time the strength and rigidity can be secured, to impart suitable flexibility, pressure conditions, and which can ensure a sufficient amount of deformation dimension.

As shown in FIGS. 9 (A) and 9 (C), the second convex portion 22 has a triangular cross-sectional shape, and has a sharp top at right angles in FIG. 9 (A), and in FIG. 9 (C). It is a triangle having a small rounded portion 35 at the top. In FIG. 9B, the cross-sectional shape of the second convex portion 22 is formed in a trapezoidal shape, and has a chamfered portion 16 in which the top of the triangle shown in FIG. 9A is chamfered.
9A, 9B, and 9C each have an inclined surface 24 on the bottom side (lower base). Then, as shown in FIGS. 10A and 10B, in the closed state where the first convex portion 21 and the second convex portion 22 overlap each other, the triangular or trapezoidal inclined surface 24 has the inclined piece portion 30. Face to the corresponding slope 23 (in parallel). The trapezoidal cross-sectional shape is not limited to the case where the chamfered portion 16 and the inclined surface 24 are parallel as shown in the figure, but also includes the case where the chamfered portion 16 and the inclined surface 24 are not truly parallel. Note that FIG. 10A corresponds to FIG. 9A, FIG. 10B corresponds to FIG. 9B, and the triangle indicated by the two-dot chain line in FIG. (C) corresponds.

  What has been described above with reference to FIGS. 8, 9, and 10 will be described with another expression. The ring body 1 has a rectangular cross-sectional shape, and the first convex portion 21 and the second convex portion 22 have a rectangular cross-section of the ring main body 1 as shown in FIG. The first corresponding surface 41 (the inclined corresponding surface 23) and the second corresponding surface 42 (the inclined surface 24) correspond to each other. Further, the first convex portion 21 is formed with a scraped portion (concave portion) 33 on the opposite side of the first corresponding surface 41.

As shown in FIGS. 5 and 6, in the closed state where the first convex portion 21 and the second convex portion 22 overlap each other, the first convex portion 21 and the second convex portion 22 are The dimensions of the cross sections of the first convex portion 21 and the second convex portion 22 are set to dimensions that do not protrude from the basic rectangle G shown in FIG.
Against radial dimension H ₂₃ · Axial dimension T ₂₃ inclined corresponding surfaces 23 (first corresponding surface 41) of the first convex portion 21 shown in FIG. 8, FIG. 9 (A) (B) (C) The radial dimension H ₂₄ and the axial dimension T ₂₄ of the inclined surface 24 (second corresponding surface 42) of the second convex portion 22 are set to be slightly smaller. In this manner, the first convex portion 21 and the second convex portion 22 are set to dimensions (dimension tolerance) that do not protrude from the outline of the cross section of the ring body 1 in the closed state.

That is, as shown in FIG. 10, when the first convex portion 21 and the second convex portion 22 overlap (coincide with) the four sides of the basic rectangle G in FIG. ) A minute seal gap g is formed between the inclined corresponding surface 23 and the inclined surface 24 (of the second convex portion 22). The maximum dimension of the seal gap g is desirably set to 10 μm or more and 100 μm or less. That is, it is desirable that 10 μm ≦ g ≦ 100 μm. When the seal gap g exceeds 100 μm, fluid leakage increases rapidly.
In this way, the corresponding two surfaces 23 and 24 (first and second) are closed so that the first convex portion 21 and the second convex portion 22 overlap the four sides of the basic rectangle G. Since the maximum gap dimension is set to 10 μm or more and 100 μm or less with the seal gap g of the corresponding surfaces 41 and 42 being maximized, the corresponding two surfaces 23 and 24 (first and second corresponding surfaces 41 and 42). Leakage can be suppressed, and the first convex portion 21 and the second convex portion 22 do not protrude from the basic rectangle G, and the sealing performance can be further improved.

As shown in FIG. 11, in the pressure receiving state, the seal ring S is pressed against the corner 8 formed by the sealed surface (plane) P ₁ and the sealed surface (curved surface) P ₂ , and the pressure P _{0 of the} fluid L The first convex portion 21 is elastically deformed and pressed against the second convex portion 22.
As the movable scroll 7 performs a scrolling motion, the first sliding contact surface 26 and the second sliding contact surface 27 come into contact (pressure contact) with the mating member --- the sealed surface P ₁ and the sealed surface P ₂ --- The first convex portion 21 is pressed against the second convex portion 22 by the pressure P _{0 of the} fluid L. When the first convex portion 21 presses the second convex portion 22, the sealing performance between both the first convex portion 21 and the second convex portion 22 is improved, and the leakage of the fluid L from the seal gap g is prevented. Decrease. As is clear from FIG. 10, a first sliding contact surface 26 and a second sliding contact surface 27 having a continuous surface are formed on the first convex portion 21 and the second convex portion 22. In the present invention, the first slidable contact surface 26 and the second slidable contact surface 27 (as described above) can be used as they are as the injection-molded surfaces omitted from machining, and in accordance with JIS B 0601. The arithmetic average roughness (Ra) of the measured surface is set to 0.1 or more and 2.0 or less to exhibit excellent sealing performance and wear resistance.

In the present invention, the thermoplastic resin composition to be injection-molded may have a flexural modulus of 1500 MPa or more and 6000 MPa or less. For example, a polysulfone resin composition, specifically, PES (polyether A sulfone resin composition, a PSU (polysulfone) resin composition, and a PPSU (polyphenylsulfone) resin composition are preferable. In particular, the flexural modulus is preferably 2000 MPa or more and 4000 MPa or less.
The PES resin composition suitable for the seal ring according to the present invention is a PES resin composition obtained by adding a compound having a layered crystal structure such as graphite powder and / or a fluororesin powder to the PES resin. Such addition makes it easy to adjust the characteristics within the above-mentioned range of bending elasticity, excellent wear resistance as a seal ring, good heat and chemical resistance, sufficient stretchability, wearability and It also has good sealing properties and is suitable for the air conditioner compressor exemplified in FIG.
In addition, as another thermoplastic resin composition, a polyarylene sulfide-based resin composition, specifically, a compound having a layered crystal structure such as the above-described graphite powder in a PPS (polyphenyl sulfide) resin, a fluororesin powder, A PPS resin composition to which a fibrous filler such as glass fiber or carbon fiber is added can also be applied.

In the present invention, since the thermoplastic resin composition can be manufactured by injection molding, the dimensional tolerance can be easily set (at the mold cavity stage) such that H ₂₄ ≦ H ₂₃ and T ₂₄ ≦ T _23. .
Although not shown, if H ₂₄ > H ₂₃ and T ₂₄ > T ₂₃ are set, a seal ring is formed at the corner portion 8 formed by the sealed surface P ₁ and the sealed surface P _{2 in use} . S is pressed. At this time, the second convex portion 22 is in close contact with both surfaces P ₁ and P ₂ , but the first convex portion 21 is in contact with only one of the surfaces to generate an external leakage gap, thereby preventing fluid leakage. Arise. In the present invention, such a problem is set to H ₂₄ ≦ H ₂₃ and T ₂₄ ≦ T ₂₃ (as described above), and the first convex portion 21 and the second convex portion 22 overlap each other. It is configured and prevented from protruding from the basic rectangle G in a closed state.

Next, another reference example of the present invention will be described.
As shown in FIG. 12, the cross-sectional shape of the ring body 1 is the above-described rectangular shape, and in the case of the rectangle (square) shown by the solid line in FIG. the (by inclined straight line L ₁₅ as shown in FIG. 7) the chamfered portion 16 notching a polygonal shape having as two-dot chain line, (sliding use state shown in FIG. 2 to the movable side the sealing surface P ₁ The first slidable contact surface 26 in contact has frictional resistance reducing means 28.
The ring main body 1 is formed with a shallow groove-shaped notch 29 as a frictional resistance reducing means 28, which is not in contact with the sealed surface P ₁ by notching the corner 19 of the basic rectangle G. By forming the shallow groove-shaped notch 29 in the first sliding contact surface 26, the oil in the sealed fluid enters between the first sliding contact surface 26 and the sealed surface P ₁ (see FIG. 2). improves the sliding (slipping) of the target sealing surface P _1. Thus, the shallow groove-like notch 29 is a notch for reducing frictional resistance. In the cross section of FIG. 12, when the chamfered portion 16 has a two-dot chain line, the width dimension W ₁ of the first sliding contact surface 26 is 10% to 50% of the width dimension W ₂ of the second sliding contact surface 27. %, And more preferably 15% to 30%. When the width W ₁ of the first sliding contact surface 26 is less than the lower limit value, there is a possibility that the sealing performance decreases, exceeds the upper limit, sliding of the first sliding contact surface 26 is insufficient, when the swing Becomes unstable, the joint portion of the first convex portion 21 and the second convex portion 22 is changed, and the leakage amount of the fluid L is increased.

As shown in FIG. 13 and FIG. 14, the shallow groove-shaped notch 29 is continuous in the circumferential direction over a central angle range slightly smaller than 360 ° excluding the first end 11 and the second end 12 of the ring body 1. Is formed. In the first end portion 11 and the second end portion 12, the cutout portion 29 is formed, so that the first convex portion 21 is not in contact with the sealed plane P ₁ , and the above-described fluid leakage occurs. Since a problem occurs, the first sliding contact surface 26 of the first convex portion 21 remains.

As shown in FIG. 15, a plurality of shallow groove-like notches 29 are intermittent in the circumferential direction in a central angle range slightly smaller than 360 ° excluding the first end 11 and the second end 12 of the ring body 1. It may be formed.
In FIG. 16, the shallow groove-shaped notch 29 is disposed at the intermediate position in the width direction of the first sliding contact surface 26 while leaving the corner portion 19 of the basic rectangle G. As shown in FIG. 17, the first sliding contact surface 26 may be covered with a material having a lower friction coefficient than the other part (second sliding contact surface 27) of the seal body 1. Alternatively, although not shown, the first sliding contact surface 26 may be provided with irregularities. In this way, the sliding property of the first sliding contact surface 26 is improved.

Next, as shown in FIG. 18A, the ring body 1 may form a notch 20 by notching the other corner 18 of the basic rectangle G that is a diagonal of the corner 15. This notch portion 20 can also be called a shaving portion. The cutout 20 is preferably formed in the same shape as the concave portion (cut-off portion) 33 of the first convex portion 21 shown in FIG. With this configuration, the mold can be easily manufactured and the cost can be reduced. Moreover, since the notch part 20 (and the recessed part 33 of the 1st convex part 21) is formed at the time of the injection molding of a thermoplastic resin composition, it does not require machining, and also has the cross-sectional shape shown in FIG.7 and FIG.12. Compared with the ring main body 1, it is possible to save the thermoplastic resin composition and to keep the material cost low. In FIG. 18A, the corner portion 19 of the basic rectangle G is cut out to form a shallow groove-like cutout portion 29, and the frictional resistance of the first sliding contact surface 26 is reduced.
Further, as shown in FIG. 18B, it is also possible to form rounded portions 29A having a small radius of curvature R ₂₉ at the corners of the shallow groove-shaped notches 29 as the frictional resistance reducing means 28 (in order to prevent cracks due to stress concentration). From) is desirable. Alternatively, as shown in FIG. 18C, the shallow groove-like notch 29 may be a thin triangular notch.

Figures 19 and 20 (A) is a cross-sectional view showing another embodiment of the present onset bright.
In FIG. 19, in the ring body 1, the basic rectangle G is a rectangle, and the side (short side) forming the first sliding contact surface 26 is shorter than the side (long side) forming the second sliding contact surface 27. That is, (used in sliding contact with the movable side to be sealed surface P ₁ At a state) frictional resistance of the first sliding contact surface 26 is reduced, which improves the sliding property. The other corner 18 of the basic rectangle G that is the opposite of the one corner 15 is cut out to form a cut-off portion (notch) 20.
As shown in FIG. 20A, the second convex portion 22 has a triangular cross-sectional shape, and the first convex portion 21 is an inclined surface of one side of the square of the second convex portion 22. 24 has an inclined piece 30 having an inclined corresponding surface 23 parallel to 24. The inclined piece portion 30 has an inclination corresponding surface 23 on the outer side, and the cut-out portion 20 of the ring body 1 and a continuous scraping portion 33 are formed on the inner side.

  FIG. 20B shows a modification of FIG. 20A. As shown in FIG. 20B, the first convex portion 21 has an inclined corresponding surface 23 on the outer side, and particularly on the inner side. An arcuate curved cut-out portion (concave portion) 33 is formed. Further, the arcuate curved cut-out portion 33 forms the first abutment piece 31 and the second abutment piece 32 of the first convex portion 21 so that the thickness dimension is locally increased. 20B, the cross-sectional shape of the ring main body 1 (not shown) is formed by cutting out the arcuate curved cut-out portion 33 from the basic rectangle G (not shown). It is also desirable that the cutout portion 20 and the scraping portion 33 of the ring body 1 are continuous as the shape. In FIG. 20A, the same operation and effect as described above can be obtained.

Next, various modifications shown in FIG. 21 will be described.
In FIG. 21, the cross-sectional area of the first convex portion 21 decreases in the order of (A), (B), and (C). In other words, it shows a case where the smaller in the order of the thickness _{T 1} is (A) (B) (C ). Speaking from the strength, it becomes weaker in the order of (A), (B), and (C), but the inclined corresponding surface 23 of the first convex portion 21 is elastically deformed with respect to the inclined surface 24 of the first convex portion 21 when pressure is received. It becomes easy to be pressed. Judging from both aspects of strength and ease of pressing, it can be said that it is preferable in order of (A), (B), and (C) in FIG. _{21A and} 21B, it is possible to form the bottom surface 25 in a non-parallel manner with respect to the inclination corresponding surface 23 as indicated by a one-dot chain line L21.
Note that the cross-sectional shape of the ring body 1 having the first convex portion 21 and the second convex portion 22 shown in FIGS. 21A, 21B, and 21C in a protruding shape is omitted in the drawing, but FIG. Then, the ring body 1 can be formed in a rectangular shape or a shape having a notch (cutting portion) 20 along the bottom surface 25 (see FIG. 18A). However, for FIGS. 21B and 21C, if the same contour shape is used, the cross section of the ring body 1 becomes excessively small and the posture during use becomes unstable. .

Next, since FIG. 21D has already been described with reference to FIGS. 10 and 11, description thereof is omitted here.
FIG. 21E shows a case where the concave portion 33 is formed in a curved arc shape, and it is also desirable that the concave portion 33 be a quarter circle. Judging from both the strength of the first convex portion 21 and the ease of being pressed against the inclined surface 24 of the first convex portion 21 (appropriate flexibility), FIGS. 21 (D) and (E) It is practically preferable to FIGS. 21A, 21B, and 21C.
And as a cross-sectional shape of the ring main body 1 having FIGS. 21D and 21E, a cut-out portion (cutting portion) 20 having a rectangular shape or having the same cross-sectional shape as the concave portion 33 (FIG. 18 ( The shape having A) is also freely selectable.

  By the way, in each embodiment already described based on FIG. 18 to FIG. 21 and the like, the cross-sectional shape of the ring body 1 is not a rectangular shape, but other corner portions 18 of the basic rectangle G are cut out. In the case of a shape in which the cutout portion 20 is formed and the cross-sectional shape in which the cutout portion 33 is formed on the first convex portion 21, the cutout portion 20 and the cutout portion 33 are continuous. It is desirable from the viewpoint of not generating a surface and stress concentration. However, the term “continuous” in the present invention is not limited to the shapes of the scraping portion 33 and the cutout portion 20, and includes cases where they are continuous as shapes similar to each other.

  Next, FIG. 22 shows a plurality of other embodiments. In FIGS. 22A and 22B, the first convex portion 21 and the second convex portion 22 are the same as those shown in FIGS. A case is shown in which two parts are divided by an L-shaped separation line Lc (instead of such a linear separation line Lc). In other words, the first convex portion 21 has a rectangular or square cutaway portion 16A having a rectangular cross section, and the second convex portion 22 has a rectangular or square cross sectional shape that fits into the cutout portion 16A. The first and second corresponding surfaces 41 and 42 are L-shaped in cross section. 22A, the scraping portion 33 of the first convex portion 21 is L-shaped. In FIG. 22B, the scraping portion 33 is a pentagon (shown by a solid line) or “1”. For example, a rectangle indicated by a chain line. Although not shown, the cross-sectional shape of the ring main body 1 corresponding to FIG. 22A or 22B is a rectangular shape and a shape having a cutout portion 20 that is the same or similar to the scraping portion 33. A case may be considered.

In the embodiment shown in FIGS. 22C and 22D, the first convex portion 21 and the second convex portion 22 are divided into two by a semicircular arc-shaped separation line Lc. That is, the cross-sectional shape of the first convex portion 21 has a four semicircular cutout portion 16B at one corner, and the second convex portion 22 has a four semicircular shape that fits into the cutout portion 16B. In FIG. 22C, the scraped portion 33 of the first convex portion 21 is a diamond type composed of an arc portion 36 having a large radius along the arc-shaped separation line Lc and short straight portions 37 and 37 at both ends thereof. It is. FIG. 22D illustrates the case where the scraping portion 33 is a triangle.
Although not shown, the cross-sectional shape of the ring main body 1 corresponding to FIGS. 22C and 22D has a rectangular shape and a shape having a notch 20 that is the same as or similar to the scraping portion 33. There is a case.
In any of the embodiments shown in FIGS. 22A, 22B, C, and D, the first corresponding surface 41 and the second corresponding surface 42 are parallel to each other. Draw an L-shape or a quarter-circle shape with a constant small dimension.

The use method (action) of the above-described seal ring of the present invention will be described.
As shown in FIG. 11, the seal ring S is pressed against the movable scroll 7 and the corner portion 8 of the housing 4 in the pressure receiving state, and the second convex portion 22 corresponds to the inner portion of the corner portion 8. In the seal ring S, the first slidable contact surface 26 is in slidable contact (pressure contact) with the movable side sealed plane P ₁ of the movable scroll 7 that scrolls, and the second slidable contact surface 27 is fixed on the fixed side of the housing 4. sliding contact (pressure contact) to the plane _{P 2.} In the first convex portion 21, the inclined piece portion 30 is pressed against the inclined surface 24 of the second convex portion 22 by the pressure P _{0 of the} fluid L, and between the first convex portion 21 and the second convex portion 22. Sealability is improved. In this way, fluid leakage from the joint portion of the first convex portion 21 and the second convex portion 22 is reduced. It should be noted that fluid leakage is not allowed at all at the place where the seal ring S is used in the compressor, and the seal ring S of the present invention has the same level of sealing performance as the current PTFE seal ring. Required. That is, it is not preferable that the seal ring S has excessive fluid leakage (compared to the PTFE seal ring), but it is also not preferable that fluid leakage be excessive. Therefore, as described in detail with reference to FIGS. 21A to 21E, the seal ring S of the present invention changes the thickness dimension T1 and the shape of the first convex portion 21 to change the _first at the time of pressure reception. The deformation amount (easiness of deformation) of one convex portion 21 can be adjusted.

As shown in FIG. 12 and FIGS. 16 to 18, a shallow groove-like notch 29 is provided to reduce (reduce) the frictional resistance of the first sliding contact surface 26 slidably contacting the movable side sealed plane P ₁ . Thus, the seal ring S is held in a stable posture at the movable scroll 7 and the corner 8 of the housing 4, and the sliding (sliding) between the sealed plane P ₁ of the movable scroll 7 and the first sliding contact surface 26 is performed. It can stabilize and can suppress the change of the joint part of the 1st convex part 21 and the 2nd convex part 22.

  Although already described in FIGS. 20 and 21, the present invention can be modified in design, and the first convex portion 21 can be deformed so as to be convex toward the second convex portion 22. The shape may be any shape, and the inclination corresponding surface 23 and the bottom surface 25 may not be parallel, and the bottom surface 25 may be curved in an arc shape.

  As described above, the seal ring according to the present invention is formed in an annular overall shape having a cut 5 at one place on the circumference, and the ring body 1 and the first end 11 and the second end of the ring body 1. In the seal ring having the first convex portion 21 and the second convex portion 22 attached in a stretched manner in the circumferential direction from the portion 12, the entire ring is formed integrally with the thermoplastic resin composition. The first projecting portion 21 and the second projecting portion 22 divide the rectangular cross section of the ring body 1 into two by the separation line Lc, and the first corresponding surface 41 has a rectangular shape. The second corresponding surfaces 42 face each other, and the first convex portion 21 has a cross-sectional shape in which a scraped portion 33 is formed on the opposite surface side of the first corresponding surface 41, and the first convex portion 21 and the second convex portion 22 are overlapped with each other, and the first convex portion 21 is closed. Since the second convex portion 22 is configured to have a dimension that does not protrude from the outline of the cross section of the ring body 1, the sealing at the joint portion of the first convex portion 21 and the second convex portion 22 is performed. Performance can be improved and fluid leakage can be reduced. In injection molding of a thermoplastic resin composition, dimensional tolerance can be easily set, and a high-quality and high-performance seal ring can be obtained easily and inexpensively. Machining such as cutting / grinding / cutting can be omitted, material loss is reduced, and manufacturing can be performed at low cost.

Further, the present invention is formed in an annular overall shape having a cut 5 at one place on the circumference, and extends in the circumferential direction from the ring body 1 and the first end portion 11 and the second end portion 12 of the ring body 1. In the seal ring having the first convex portion 21 and the second convex portion 22 attached in a shape, the whole is integrally formed of a thermoplastic resin composition, and the cross-sectional shape of the ring body 1 is movable. With respect to one corner 15 of the basic rectangle G corresponding to the corner 8 of the side sealed surface P ₁ and the fixed side sealed surface P ₂ , the other corner 18 of the basic rectangle G as a diagonal is cut away. The notch 20 is formed, and the first protrusion 21 and the second protrusion 22 divide the transverse cross section of the ring body 1 having the notch 20 into two at the separation line Lc, The first corresponding surface 41 and the second corresponding surface 42 face each other, and the first convex portion 21 is formed on the ring body 1. The first convex portion has a cross-sectional shape in which a continuous scraping portion 33 is formed in the notch portion 20, and the first convex portion is in a closed state in which the first convex portion 21 and the second convex portion 22 overlap each other. 21 and the second convex portion 22 are set to dimensions that do not protrude from the basic rectangle G, so that the sealing performance at the joint portion of the first convex portion 21 and the second convex portion 22 can be improved. , Fluid leakage can be reduced. In injection molding of a thermoplastic resin composition, dimensional tolerance can be easily set, and a high-quality and high-performance seal ring can be obtained easily and inexpensively. Machining such as cutting / grinding / cutting can be omitted, material loss is reduced, and manufacturing can be performed at low cost. The posture at the time of sliding is stabilized, the fluctuation of the joint portion of the first convex portion 21 and the second convex portion 22 can be suppressed, and the fluid leakage can be prevented from becoming excessive. The material cost can be kept low by saving the thermoplastic resin composition. In addition, the lifetime is increased.

The first sliding contact surface 26 of the ring body 1 is in sliding contact with the movable side to be sealed surface P ₁ is provided with the shallow groove-like notch 29 for friction reduction, the posture is stabilized during sliding The fluctuation of the joint portion of the first convex portion 21 and the second convex portion 22 can be suppressed, and the fluid leakage can be prevented from becoming excessive. Furthermore, there is an advantage that the lifetime is long.
The first sliding contact surface 26 of the ring body 1 is in sliding contact with the movable side to be sealed surface P ₁ is formed by coating with a low coefficient of friction material, which is configured to reduce the frictional resistance, sliding The posture at the time of movement is stabilized, the fluctuation of the joint portion of the first convex portion 21 and the second convex portion 22 can be suppressed, and the fluid leakage can be prevented from becoming excessive. Furthermore, there is an advantage that the lifetime is long.

The ring body 1 in the open state has a portion 13 having a maximum radius of curvature R ₁₃ within a range of 180 ° ± 30 ° with respect to the center point P _{5 of the} cut 5. To the first end portion 11 and the second end portion 12, the curvature radii R ₁ and R ₂ are set so as to decrease toward the circumferential directions M ₁ and M _2, and the first convex portion 21 and the second convex portion 22 are configured so that the overall shape is a perfect circle in the closed state where the second convex portion 22 overlaps with each other. Under the use condition where 21 and the 2nd convex part 22 overlap, it becomes a perfect circle and exhibits the outstanding sealing performance (sealability) with respect to a circular internal peripheral surface.

DESCRIPTION OF SYMBOLS 1 Ring main body 5 Cut | interruption 8 Corner | angular part 11 1st end part 12 2nd end part 13 Maximum dimension part 15 1 corner | angular part 16 Chamfering part 16A, 16B Notch part 18 Corner | angular part 20 Notch part 21 1st convex part 22 2nd convex part Part 23 Inclination corresponding surface 24 Inclined surface 26 First sliding contact surface 28 Friction resistance reducing means 29 Shallow groove-shaped notch 30 Inclined piece 33 Cutting part (recess)
G basic rectangular Lc separation lines L ₁₅ inclined straight line M _{1, M 2} circumferential P ₁ movable the sealed surface P ₂ stationary be sealed surface P ₅ midpoint _{R 13,} R 1, R ₂ radius of curvature

Claims (4)

Formed in an annular overall shape having a cut (5) at one place on the circumference, from the ring body (1) and the first end (11) and the second end (12) of the ring body (1) In a seal ring having a first convex portion (21) and a second convex portion (22) attached in a stretched manner in the circumferential direction,
The whole is integrally formed with the thermoplastic resin composition,
The cross-sectional shape of the ring body (1) is _one corner of the basic rectangle (G) corresponding to the corner (8) of the movable side sealed surface (P ₁ ) and the fixed side sealed surface (P ₂ ). With respect to the part (15), the other corner (18) of the basic rectangle (G) as a diagonal is notched to form a notch (20),
It said first projection (21) and the second projection (22), the horizontal cross section of the ring body of the cross-sectional shape (1) with the notch (20) 2 divided by separation line (Lc) Te, continuous to face each other with a first corresponding surface (41), second corresponding surface (42), the first protrusion on SL (21), the notch of the ring body (1) to (20) A cross-sectional shape in which a shaped cut-out part (33) is formed,
Above cut closed state where the first protrusion (21) and the second convex portion and the (22) overlapping each other, the first projection (21) and said second projection (22) is the basic rectangle ( A seal ring having a dimension that does not protrude from G) . The first sliding contact surface ( 26) in which the ring main body (1) is in sliding contact with the movable side sealed surface (P ₁ ) is provided with a shallow groove-shaped notch (29) for reducing frictional resistance. seal ring. The first sliding contact surface (26) in which the ring body (1) is in sliding contact with the movable side sealed surface (P ₁ ) is formed by covering with a material having a low friction coefficient so as to reduce the frictional resistance.請Motomeko 1 Symbol placement of the seal ring there. The ring body (1) in the open state has a maximum radius of curvature (R ₁₃ ) within a range of 180 ° ± 30 ° with respect to the center point (P ₅ ) of the cut (5) (13) And a radius of curvature (as it approaches the circumferential direction (M ₁ ) (M ₂ ) from the maximum dimension portion (13) toward each of the first end (11) and the second end (12). R ₁ ) (R ₂ ) is set so as to decrease, and the overall shape is a perfect circle in a closed state where the first convex portion (21) and the second convex portion (22) overlap each other. claim that is configured to be 1, 2 or 3 Shiruri ring according.

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