TW201546388A - Seal ring - Google Patents

Abstract

It is an object of the present invention to provide a seal ring, having an opening on one postiton on the periohery, of which cross section is polygonal, formed without machine work, and shows excellent sealing ability. The seal ring is injection-molded with heat-plastic resin compound, having a formed configuration of nontrue circle with an opening slit, and diminished to a ture circle in used state.

Description

Sealing ring

The invention relates to a sealing ring.

A conventional seal ring having an annular shape having a notch at a circumference thereof, comprising a ring body and first and second protrusions protruding from the two ends of the ring body in a circumferential direction, The seal is sealed between the movable scroll of the compressor and the outer cover, and the material is mainly PTFE (polytetrafluoroethylene). (Japanese Laid-Open Patent Publication No. 2007-247526 and Japanese Patent Application Publication No. Hei 8-276508)

This type of seal ring is a cylindrical PTFE material which is first mechanically tangentially wound and then machined by cutting, grinding, cutting, or the like. Therefore, conventional materials have a number of processing operations requiring mechanical processing, etc., and also cause a large loss of materials and a disadvantage of high manufacturing cost. On the other hand, although it is possible to manufacture the injection molding, in this case, the opening portion is chamfered, and when the bevel is joined, the sealing ring cannot form a perfect circle, and thus the sealing property may be insufficient.

Therefore, the seal ring of the present invention has an annular overall shape having a notch at one circumference, and includes a ring body and a first end portion and a second end portion of the ring body extending in a circumferential direction. a first convex portion and a second convex portion; the notch is an annular overall shape in which the thermoplastic resin composition is integrally formed into an open state, and the ring body 1 in the open state is opposite to a center point of the notch at 180 Within the range of ±30°, the radius of curvature is the largest part And the position of the largest dimension is directed toward each of the first end portion and the second end portion, and the radius of curvature decreases as the circumferential direction approaches, and the first convex portion and the second convex portion overlap each other In the closed state of the notch, the overall shape is formed into a perfect circular shape.

Further, the thermoplastic composition of the thermoplastic resin composition is a resin composition of 1500 MPa or more and 6000 MPa or less. Further, the arithmetic mean roughness of the surfaces of the two contact faces facing the counterpart member is set to be 0.1 or more and 2 or less.

Furthermore, the cross-sectional shape of the ring body is rectangular, and the first convex portion and the second convex portion are divided into two cross-sectional shapes by a separation line to divide the rectangular cross section of the ring body; When the notch and the second convex portion overlap each other, the two corresponding surfaces of the first convex portion and the second convex portion have a gap therebetween.

According to the present invention, machining such as cutting, grinding cutting, cutting, and the like can be omitted, and the loss of material can be reduced, and a high-quality, high-performance sealing ring can be manufactured at low cost. In particular, a seal ring suitable for a compressor for scrolling motion can be provided.

〔this invention〕

1‧‧‧ ring ontology

2‧‧‧Compressor

3‧‧‧Vortex compression mechanism

4‧‧‧ Cover

4A‧‧‧Flat Department

4B‧‧‧Sealing groove

5‧‧‧ gap

6‧‧‧ fixed scroll

7‧‧‧ movable scroll

7A‧‧‧Back

8‧‧‧ corner

9‧‧‧ gap

10‧‧‧Injection into the gate trace

11‧‧‧ First end

12‧‧‧ second end

13‧‧‧The part of the largest radius of curvature

15‧‧‧ corner

16‧‧‧Going to the corner

16A‧‧‧cutting

16B‧‧‧ Curved concave section

17‧‧‧ corner

18‧‧‧ corner

19‧‧‧ corner

21‧‧‧First convex

22‧‧‧second convex

23‧‧‧Corresponding face

24‧‧‧ corresponding face

26‧‧‧First contact surface

27‧‧‧Second contact surface

34‧‧‧ arc-shaped recess

35‧‧‧ Small fillet

F‧‧‧Injection direction

G‧‧‧Basic rectangle

H23‧‧‧ radial size

H24‧‧‧ radial size

K1‧‧‧External leakage gap

K2‧‧‧ External leakage gap

L0‧‧‧ line

L15‧‧‧Slanted straight line

L21‧‧ separate line

M1‧‧‧ circumferential direction

M2‧‧‧ circumferential direction

M10‧‧‧ arrow

M20‧‧‧ arrow

O1‧‧‧ Center Point

P1‧‧‧ sealed plane

P2‧‧‧ sealed inner circumference

P5‧‧‧ Center Point

R0‧‧‧ radius of curvature

R1‧‧‧ radius of curvature

R2‧‧‧ radius of curvature

R11‧‧‧ radius of curvature

R12‧‧‧ radius of curvature

R13‧‧‧ radius of curvature

S‧‧‧Seal ring

T23‧‧‧ axial dimensions

T24‧‧‧ axial dimensions

Figure 1 is a cross-sectional view of a compressor specifically illustrating the use of the seal ring of the present invention.

Fig. 2 is an enlarged cross-sectional view showing the use of one embodiment of the present invention.

Figure 3 is a top view of the notched opening state.

Fig. 4 is a front elevational view showing a state in which the notch opening of one of the rear portions is omitted.

Figure 5 is a partially enlarged top view of the notched opening state.

Fig. 6 is a partially enlarged front elevational view showing the state of the notched opening.

Figure 7 is a top view of the gap closed state.

Figure 8 is a front view of the notched closed state.

Figure 9 is a partially enlarged top view of the notched closed state.

Figure 10 is a partially enlarged front elevational view of the notched closed state.

Figure 11 is an explanatory view of a partial section.

Fig. 12A is a cross-sectional explanatory view of the separation line.

Fig. 12B is a cross-sectional view taken along line B-B of Fig. 6.

Fig. 13A is a cross-sectional view taken along line C-C of Fig. 6 and a cross-sectional view of a modification.

Fig. 13B is a cross-sectional view taken along line C-C of Fig. 6 and a cross-sectional view of a modification.

Fig. 13C is a cross-sectional view taken along line C-C of Fig. 6 and a cross-sectional view showing a modification.

Fig. 14A is a cross-sectional view taken along line E-E of Fig. 10 and a cross-sectional view showing a modification.

Fig. 14B is a cross-sectional view taken along line E-E of Fig. 10 and a cross-sectional view showing a modification.

Fig. 14C is a cross-sectional view taken along line E-E of Fig. 10 and a cross-sectional view showing a modification.

Fig. 14D is a cross-sectional view taken along line E-E of Fig. 10 and a cross-sectional view showing a modification.

Fig. 15 is a partially enlarged cross-sectional view showing the state of use.

Figure 16A is a partial cross-sectional view showing different embodiments.

Figure 16B is a partial cross-sectional view showing different embodiments.

Figure 16C is a partial cross-sectional view showing different embodiments.

Figure 16D is a partial cross-sectional view showing different embodiments.

Figure 16E is a partial cross-sectional view showing different embodiments.

Figure 16F is a partial cross-sectional view illustrating various embodiments.

Fig. 17 is a partially enlarged cross-sectional view showing the state of use disclosed in the case where the dimensional tolerance of the first convex portion is not uniform.

Fig. 18 is a partially enlarged cross-sectional view showing the state of use disclosed in the case where the dimensional tolerance of the first convex portion is not uniform.

The above and other objects, features and advantages of the present invention will become more <RTIgt; <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; Sealing ring S is formed in a circle The overall shape of the ring having a notch 5 on Monday. Further, the seal ring S includes a ring body 1 that occupies a center angle slightly smaller than 360°, and a first one that is extended in the circumferential direction by the first end portion 11 and the second end portion 12 of the ring body 1. The convex portion 21 and the second convex portion 22. The use state is shown in Figs. 1 and 2, and the case where the scroll compression mechanism 3 of the compressor 2 for an air conditioner is applied is exemplified.

The scroll compression mechanism 3 is mainly composed of a fixed scroll 6 disposed above the outer cover 4 and the outer cover 4, a movable scroll 7 that engages the fixed scroll 6, and the like. In the outer cover 4, a seal groove 4B is recessed in a flat portion 4A facing the lower surface (back surface) 7A of the movable scroll 7, and the seal ring B of the present invention is incorporated in the seal groove 4B. The seal ring S seals (closes) the back surface 7A of the movable scroll 7 and the flat portion 4A of the outer cover 4 to form a back pressure space. In addition, Fig. 2 is an enlarged view of the Y portion of Fig. 1 .

Further, as shown in FIGS. 3 to 6, the notch 5 is formed of a thermoplastic resin composition and integrally molded into an overall shape in an open state. In Fig. 3, the arrow F reveals the injection direction of the molten resin at the time of injection molding, and the symbol 10 is injected into the gate trace portion, and the cutting edge can be cut as beautifully as possible, but the remaining minute portion is formed.虞, therefore, it is also possible to perform machining such as grinding and cutting of the final finishing. However, in addition to the injection of the gate trace portion 10, machining may be omitted to form an injection molding surface.

A preferred thermoplastic resin composition for injection molding of the seal ring S of the present invention is a PES resin composition. Since the injection molded article has an advantage that it is difficult to produce a so-called burr, and the shrinkage property after removal of the metal mold is low due to a low coefficient of thermal expansion, the size of the seal ring S can also maintain high precision, so that the aforementioned machining can be omitted. advantage.

Further, as shown in Fig. 3, the notch 5 is integrally formed in the open state, and is integrally formed of a thermoplastic resin composition such as a PES resin composition. However, the notch 5 taken out by the injection mold is in an open state. The ring body 1 of the seal ring S has a portion 13 having a maximum radius of curvature R _{13 on} the opposite side of the notch 5, and is set to face the first end portion 11 and the second end from the portion 13 of the maximum size. The portion 12 is formed to gradually decrease in radius of curvature R ₁ , R ₂ as it approaches the circumferential direction M ₁ , M ₂ , and the radius of curvature R ₁₁ , R ₁₂ of the first end portion 11 and the second end portion 12 form a minimum size. Further, the radius of curvature of the outer peripheral surface of the first convex portion 21 and the second convex portion 22 having a small protruding size is the same as that of the above-described R ₁₁ and R ₁₂ . Further, as shown in Fig. 3, the curvature radii R ₁₃ , R ₁ , R ₂ , R ₁₁ , and R ₁₂ are the dimensions from the center point O ₁ to the outer circumferential surface of the ring main body 1.

Further, the above-mentioned maximum size portion 13 will be additionally described. In the third diagram, the ring body 1 in the open state is located at a point (center point) P ₅ with respect to the center of the notch 5, and exists within a range of 180° ± 30°. The largest size part 13. That is, the θ shown in Fig. 3 is 30°, and the portion 13 having the largest size is disposed in the range of 2θ = 60°. The center angle of the portion 13 of the largest size is selected to be in the range of 1 to 60 degrees. Further, in Fig. 3, L ₀ reveals a line including the diameter of the center point P ₅ .

Thus, the shape and size of the cavity of the metal mold and the seal ring S (refer to FIG. 3) taken out therefrom have an outer peripheral shape of ±θ (=±30°) on the opposite side of 180° with respect to the notch 5. In the range of the range, the portion 13 having the radius of curvature R ₁₃ is the largest size, and is set to a non-circular shape in which the portion 13 gradually decreases toward the notch 5. In the state of use, that is, in the state in which the sealing groove 4B is attached as shown in FIG. 2, the first convex portion 21 and the second convex portion 22 are overlapped with each other to form a notched closed state, but in the notched opening state, By the above-mentioned non-asymmetric circle, and with the elastic deformation, a perfect circle having the same radius R ₀ is formed from the center point O ₁ , and the inner wall surface on the outer side in the radial direction of the seal groove 4B shown in FIG. 2 is tight. s contact. When the notch opening state (Fig. 3) is deformed toward the notch closed state (Fig. 7), the portion 13 deformed to the maximum size is the largest and the radius of curvature is reduced, and the first end portion 11 and the second end portion 12 are 12 The system will hardly deform. Therefore, the radius of curvature R ₀ shown in Fig. 7 is formed to be equal to the curvature radii R ₁₁ and R ₁₂ of the first end portion 11 and the second end portion 12 shown in Fig. 3 .

The cross-sectional shape of the ring body 1 is rectangular. In the present invention, the term "rectangular" includes, of course, a square or a rectangle as shown in Fig. 2, and even includes a shape in which a corner portion 15 is removed by a substantially rectangular G by a slanted straight line L ₁₅ as shown in Fig. 11. And may also be defined as a shape in which at least one of the four corners including a square or a rectangle has a small rounded portion. In the usage state shown in FIG. 2, comprising contacting the movable scroll 7 and the like of the back surface 7A (movable side) of the inner wall surface of the sealing plane P ₁ of the first contact surface 26, and the contact 4B of the seal groove 14 and the like ( The fixed side) is sealed with the second contact surface 27 of the inner peripheral surface P ₂ . The corner portion 8 formed by the vertically sealed plane P ₁ and the sealed inner peripheral surface P ₂ is pressed when pressed.

However, even in the present invention, by using a thermoplastic resin composition such as a PES resin composition, a cross section is formed into a square shape or a rectangular shape (omitted chamfering) as shown in Fig. 2 and the like, and the seal ring S is formed in the wrap motion. One of the corner portions 15 has an advantage that no trouble occurs in the gap between the back surface 7A and the flat portion 4A. However, in the case where the conditions of use such as pressure, temperature, moving speed, direction of action, and the characteristics of the fluid are too severe, it is preferable to form the chamfered portion 16 as shown in Fig. 11 and the like. Described in relation to the additional cross-sectional shape of the corner portion 16, then as shown in FIG. 11, a straight line inclined by ₁₅ by the two-dot chain line L G in the substantially rectangular shape 15 is removed (FIG. 11 in the corner portion based Take the C chamfer as an example).

Next, in the embodiment shown in FIG. 12, FIG. 13A, FIG. 14A, FIG. 15, and FIG. 16A, the first convex portion 21 and the second convex portion 22 are divided into a pentagon and a triangle by a slanted straight line. . That is, the first convex portion 21 is a cross-sectional shape of a pentagon of the three corner portions 17, 18, 19 of the substantially rectangular G shown in Fig. 11; further, the second convex portion 22 is a triangular cross-sectional shape. And the two corresponding faces 23, 24 are formed in a slanted shape to form a correspondence. Further, as shown in Fig. 11, the cross-sectional shape of the ring body 1 is a pentagon shape in which a corner portion 15 is removed from the substantially rectangular G by the inclined straight line L ₁₅ , and the embodiment shown in Figs. 13B and 14B is implemented. In the example, the second convex portion 22 is formed in a trapezoidal shape having the chamfered portion 16. Further, the bottom surface thereof is used as the corresponding surface 24, and faces the inclined corresponding surface 23 of the first convex portion 21. Further, in Fig. 14B, as shown by the solid line, although the two corresponding faces 23, 24 may be parallel to the chamfered portion 16, it may be preferably non-parallel as shown by the two-dot chain line in the figure ( At this time, the second convex portion 22 does not form a trapezoidal shape.

Next, in the embodiment shown in FIGS. 13C and 14C, the shape of the first convex portion 21 is the same as that of the above-mentioned 13B and 14B, and the second convex portion 22 is formed with a small rounded corner at the top. The triangular cross-sectional shape of the portion 35. Further, the two corresponding faces 23 and 24 are the same as those of the above-described Figs. 13B and 14B. Further, in the embodiment shown in Fig. 14D, it is revealed that the small rounded portion 35 described in Fig. 14C can be changed to the arcuate concave portion 34. The other lines are the same as the 14D picture. In other words, the deangulated portion 16 having a straight line is shown in Fig. 14B, and the curved deangulation is applied in the 14C and 14D drawings.

Next, various embodiments are disclosed in FIG. 16, and FIG. 16A again discloses the same cross-sectional shape as that of FIG. 14A, and FIG. 16B shows the shapes of the first convex portion 21 and the second convex portion 22 ( Triangle) is set to approximately equal. Further, in the drawings of FIGS. 16A and 16B, the cross-sectional shape of the second convex portion 22 is a right-angled equilateral triangle shape, and preferably, the cross-sectional shape may be formed as shown in FIGS. 16C and 16D. Triangular shape. As described above, in the 16A, 16B, 16C, and 16D drawings, the two corresponding surfaces 23 and 24 are straight lines (in the cross-sectional shape). Furthermore, in the embodiment shown in FIG. 16E, the cross-sectional shape of the first convex portion 21 is formed by cutting a rectangular or square cutout portion 16A at one corner, and the second convex portion 22 is formed to be fitted. The rectangular or square cross-sectional shape of the cutout portion 16A is formed, and the two corresponding surfaces 23 and 24 are formed in a L-shaped cross section. Furthermore, in the embodiment shown in FIG. 16F, the cross-sectional shape of the first convex portion 21 is formed by cutting a concave concave portion 16B of a quarter circle or the like at a corner portion, and the second convex portion is formed. The portion 22 is formed into a sector shape in which the cross section of the cutout portion 16B is quarter-circular, and the two corresponding surfaces 23 and 24 form a circular arc curve. Further, the shape of the cutout portion in the intermediate portion of the two embodiments shown in Figs. 16E and 16F can be freely formed (the drawings are omitted). Alternatively, the small rounded portion 35 and the arcuate recessed portion 34 as shown in Fig. 14C or Fig. 14D may be preferably formed at the right angle top of the second convex portion 22 of each of the sixteenth embodiments. .

Further, as shown in FIGS. 7 to 10, in the state in which the first convex portion 21 and the second convex portion 22 overlap each other, the cross-sectional portions of the first convex portion 21 and the second convex portion 22 are set to each other in size. The dimensional tolerance of the basic rectangle G not shown in Fig. 11 is out of range. The radial dimension H ₂₃ and the axial dimension T ₂₃ (refer to FIG. 12B) of the inclined corresponding surface 23 along the separation line L ₂₁ shown in FIG. 12A will be divided as shown in FIG. 12A. The radial dimension H ₂₄ and the axial dimension T ₂₄ of the inclined counterpart surface 24 of the offline line L _{21 are} set to be the same or only minute. That is, in the closed state in which the first convex portion 21 and the second convex portion 22 overlap each other, the contact faces 26 and 27 of the first convex portion 21 and the second convex portion 22 which are overlapped each other are formed to conform to the substantially rectangular G. In this case, the cross-sectional shape and size of the first convex portion 21 and the second convex portion 22 are set such that a gap is formed between the two corresponding surfaces 23 and 24 (see FIGS. 14, 15, and 16).

In the present invention, since it can be produced by injection molding of a thermoplastic resin composition, it is easy to set dimensional tolerances like H ₂₄ ≦H ₂₃ and T ₂₄ ≦T ₂₃ (in the stage of the mold of the metal mold). . Fig. 17 or Fig. 18 is an explanatory diagram showing a case where a failure state is set assuming that H ₂₄ > H ₂₃ and T ₂₄ > T _{23 are set} . That is, in the use state, the ring body S is pressed by the corner portion 8 formed by the sealed plane P ₁ and the sealed inner peripheral surface P ₂ , and at this time, the second convex portion 22 is in close contact with the two faces P ₁ , P ₂ , and the first convex portion 21 abuts only one of the surfaces, and generates external leakage gaps K ₁ , K ₂ , and fluid leakage occurs in the directions of arrows M ₁₀ and M ₂₀ .

In the present invention, the gap can be closed by the formation of H ₂₄ ≦H ₂₃ , T ₂₄ ≦T ₂₃ as described above, and the first convex portion 21 and the second convex portion 22 overlap each other without being substantially rectangular G Exceeding the range, and having a gap between the two corresponding faces 23 and 24, it is possible to prevent a bad state as shown in Figs. Further, as shown in Fig. 15, when the first convex portion 21 and the second convex portion 22 are formed to overlap (consistent) with the four sides of the basic rectangle G of Fig. 11, the second corresponding surface along the separation line L ₂₁ That is, the gap size ε of the corresponding surface 23 and the corresponding surface 24 is maximized, and the maximum gap size ε0 is preferably set to be 10 μm or more and 100 μm or less. That is, it is preferable to form 10 μm ≦ ε 0 ≦ 100 μm. When the upper limit is exceeded, the fluid leakage will increase dramatically.

Thus, in the gap closed state, and the first convex portion 21 and the second convex portion 22 are overlapped with the four sides of the basic rectangle G, the gap size ε along the two corresponding faces 23, 24 of the separation line L ₂₁ is maximized. In this state, since the maximum gap size ε0 is set to 10 μm or more and 100 μm or less, leakage from the two corresponding faces 23 and 24 can be suppressed, and the first convex portion 21 and the second convex portion 22 are not exceeded by the basic rectangular G. , but can further improve the sealing performance.

Referring back to Fig. 2, since the movable scroll 7 is subjected to the wrap motion, the two contact faces 26 and 27 are brought into contact with each other by the sealing plane P ₁ and the sealed inner peripheral surface P ₂ (pressure-bonded). Further, as is apparent from the third to tenth views, the first convex portion 21 and the second convex portion 22 also have continuous faces to form the two contact faces 26 and 27. In the present invention, the two contact faces 26 and 27 also omits the original appearance of the mechanical injection molding as described above, and the arithmetic mean roughness (Ra) of the surface measured by JIS B 0601 is set. It is 0.1~2, and it can exert excellent sealing performance and abrasion resistance. In addition, the thermoplastic resin composition required for the injection molding may be a material having a flexural modulus of 1500 MPa or more and 6000 MPa or less. For example, a polyfluorene-based resin composition, specifically, a PES (polyether) resin is preferable. Composition, PSU (polyfluorene) resin composition, PPSU (polyphenyl hydrazine) resin composition. In particular, the bending elastic modulus is preferably 2000 MPa or more and 4,000 MPa or less.

Further, as a preferred PES resin composition of the seal ring of the present invention, a PES resin composition having a layered crystal structure such as graphite powder and/or a fluororesin powder is added to the PES resin. By such addition, the characteristics can be easily adjusted within the range of the above-mentioned bending elasticity, and the seal ring is excellent in abrasion resistance, heat resistance and chemical resistance, and has sufficient elongation, and is excellent in sealing and sealing. It is also suitable for the air conditioner compressor and the like illustrated in Fig. 1 . Further, as the other thermoplastic resin composition, a polyarylene sulfide-based resin composition can be used, and specifically, a layered graphite powder or the like is added to the PPS (polyphenylene sulfide) resin composition. A PPS resin composition of a crystalline structure compound, a fluororesin powder, and/or a fibrous filler such as glass fiber or carbon fiber may also be used.

In the present invention, the notch 5 is formed of a thermoplastic resin composition, and is integrally molded into an overall shape in an open state, and an injection molding surface in which mechanical processing is omitted can be formed in addition to the injection gate trace portion 10 of the thermoplastic resin composition. Therefore, the shape of the non-overlapping portion is formed by the plan view, and the metal mold is easy to manufacture, and the machining can be almost or completely omitted, and the number of times of processing can be reduced, compared with the conventional manufacturing method that requires cutting or grinding. In addition, the loss of material can be reduced, and the manufacturing cost can be reduced, and the sealing ring system with good sealing or abrasion resistance can maintain stable high quality and be mass-produced.

The present invention is as described above, since the seal ring is formed in an annular overall shape having a notch 5 at one circumference, and includes the ring body 1 and the first end portion 11 and the second end portion 12 of the ring body 1 a first convex portion 21 and a second convex portion 22 which are extended in the circumferential direction; the notch 5 is an annular overall shape in which the thermoplastic resin composition is integrally formed into an open state, and the ring body 1 is in the open state. Relative to the center point P _{5 of} the notch 5, in the range of 180°±30°, the radius of curvature R ₁₃ is the portion 13 having the largest dimension, and is set to be from the portion 13 of the largest dimension toward each of the first ends. The portion 11 and the second end portion 12 are formed to have a smaller radius of curvature R ₁ and R ₂ as they approach the circumferential directions M ₁ and M ₂ , and the first convex portion 21 and the second convex portion 22 are closed at mutually overlapping gaps. In the state in which the overall shape is formed into a perfect circular shape; therefore, even if the notch 5 in which the metal mold is easily manufactured is in an open state, the first convex portion 21 and the second convex portion 22 are in a state of being overlapped with each other, Forms a perfect circle and exhibits excellent sealing with respect to the circular inner peripheral surface (Closed).

In addition, since the thermoplastic resin composition having a flexural modulus of 1500 MPa or more and 6000 MPa or less is used as the thermoplastic resin composition, it has sufficient stretchability, and can exhibit a preferable elastic tension as a seal ring, and the opposite aspect. The contact condition is also excellent, and has excellent sealing performance (closedness). Further, for the first time, by injection molding, it is possible to realize the practical use of a seal ring excellent in heat resistance, chemical resistance, and abrasion resistance. Further, since the arithmetic mean roughness Ra of the surfaces of the two contact faces 26 and 27 facing the counterpart member is set to 0.1 or more and 2 or less, Therefore, it is possible to ensure better sealing performance (closure).

Furthermore, since the cross-sectional shape of the ring body 1 is rectangular, and the first convex portion 21 and the second convex portion 22 are separated by a separation line L _21, the rectangular cross section of the ring body 1 is divided into two. a cross-sectional shape; and in a closed state in which the first convex portion 21 and the second convex portion 22 overlap each other, the two corresponding surfaces 23 and 24 of the first convex portion 21 and the second convex portion 22 are mutually connected The gap; therefore, the leakage in the directions of the arrows M ₁₀ and M ₂₀ described in Figs. 17 and 18 will be remarkably reduced. That is, the sealing property at the joint portion between the first convex portion 21 and the second convex portion 22 can be improved. Further, by the injection molding of the resin, the seal ring of such a shape can be obtained easily and inexpensively.

While the present invention has been disclosed in its preferred embodiments, it is not intended to limit the scope of the present invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the patent application.

1‧‧‧ ring ontology

5‧‧‧ gap

10‧‧‧Injection into the gate trace

11‧‧‧ First end

12‧‧‧ second end

13‧‧‧The part of the largest radius of curvature

21‧‧‧First convex

22‧‧‧second convex

26‧‧‧First contact surface

2‧‧‧second contact surface

F‧‧‧Injection direction

L ₀ ‧‧‧ line

M ₁ ‧‧‧ circumferential direction

M ₂ ‧‧‧ circumferential direction

O ₁ ‧‧‧ Center

P ₅ ‧‧‧ Center Point

R ₁ ‧‧‧ radius of curvature

R ₂ ‧‧‧ radius of curvature

R ₁₁ ‧‧‧ radius of curvature

R ₁₂ ‧‧‧ radius of curvature

R ₁₃ ‧‧‧ radius of curvature

S‧‧‧Seal ring

Claims (4)

A seal ring having a ring-shaped overall shape having a notch at one circumference, and comprising a ring body and a first protrusion portion extending from a first end portion and a second end portion of the ring body in a circumferential direction a second convex portion; the notch is an annular overall shape in which the thermoplastic resin composition is integrally formed into an open state, and the ring body 1 in the open state is at a center point of the notch at 180°±30° In the range, the radius of curvature is the portion having the largest dimension, and is set such that the portion of the largest dimension faces each of the first end portion and the second end portion, and the radius of curvature decreases as the circumferential direction approaches, When the convex portion and the second convex portion are in a closed state in which the gaps are overlapped, the overall shape is formed into a perfect circular shape. The seal ring according to claim 1, wherein the thermoplastic resin composition has a flexural modulus of 1500 MPa or more and 6000 MPa or less. The seal ring according to claim 1 or 2, wherein the arithmetic mean roughness of the surfaces of the two contact faces facing the counterpart member is set to 0.1 or more and 2 or less. The sealing ring of claim 1, wherein the cross-sectional shape of the ring body is rectangular, and the first convex portion and the second convex portion are separated by a separating line. The rectangular cross section is divided into two cross-sectional shapes; in a closed state in which the first convex portion and the second convex portion overlap each other, the two corresponding surfaces of the first convex portion and the second convex portion are mutually connected gap.