Sealing ring and mold for manufacturing sealing ring

Abstract

The utility model discloses a sealing ring and a mould for manufacturing the sealing ring, and relates to the technical field of sealing products, the sealing ring comprises a sealing ring body, the section of the sealing ring body is in a right triangle shape, the outermost periphery of a fillet corresponding to the right angle of the right triangle is a sealing surface, and the half position of a second right-angle side is used as a reference surface. The sealing ring body is provided with an outer parting line and an inner parting line, and the inner parting line and the outer parting line are arranged on the upper side and the lower side of the datum plane respectively and avoid the sealing face. Wherein the die is provided with parting surfaces with height difference through an upper die plate and a lower die plate, so that an inner parting line and an outer parting line avoid a sealing surface. The sealing face of the sealing ring is smooth, the sealing ring can make close contact with a ball body when installed in the ball valve, the parting line is prevented from making contact with the ball body, and the sealing reliability of the valve is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing products, in particular to a sealing ring and a mold for manufacturing the sealing ring. Background Art

[0002] At present, a triangular sealing ring is mostly used as a seal in a valve with a rotating sphere, such as a ball valve. The triangular sealing ring is formed by an injection mold. Most of the injection molds are composed of an upper mold and a lower mold. It is impossible to make the joint between the upper and lower molds absolutely smooth, and a parting line will be generated. In order to facilitate the molding of the sealing ring, the parting surface of the existing mold for manufacturing the sealing ring is located at half of the thickness of the sealing ring. After the sealing ring is molded, the outer parting line coincides with the sealing surface. When this sealing ring is installed on the valve seat of the ball valve, since the sphere rotates frequently, burrs and flash that are difficult to grind flat easily occur at the parting line of the sealing ring. When it contacts and seals with the sphere, the burrs and flash are likely to scratch the surface of the sphere, affecting the sealing performance of the valve. Due to the influence of factors such as temperature, cracks may also occur at the parting line, and the frequent rotation of the sphere may cause the cracks to expand, affecting the reliable operation of the valve. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the utility model provides a sealing ring and a mold for manufacturing the sealing ring.

[0004] The technical solution provided by the utility model is as follows:

[0005] A sealing ring includes a sealing ring body. The cross-section of the sealing ring body is a right triangle, including a first right-angled side, a second right-angled side, and a hypotenuse. The joints between the surfaces are provided with rounded corners. The outermost periphery of the rounded corner corresponding to the right angle of the right triangle is the sealing surface. Taking half of the second right-angled side as the reference surface, the sealing ring body is provided with an outer parting line and an inner parting line. The inner parting line and the outer parting line are respectively arranged on the upper and lower sides of the reference surface and are arranged to avoid the sealing surface.

[0006] The outer parting line is arranged at the outer edge of the rounded corner at the joint of the first right-angled side and the hypotenuse, and the inner parting line is arranged at the outer edge of the second right-angled side.

[0007] The outer parting line is arranged at the outer edge of the rounded corner at the joint of the first right-angled side and the hypotenuse, and the inner parting line is arranged at the outer edge of the rounded corner at the joint of the second right-angled side and the hypotenuse.

[0008] Taking the first right-angled side as the reference line, the distance from the outer parting line to the reference line is less than the distance from the inner parting line to the reference line.

[0009] A mold for manufacturing a sealing ring, comprising an upper template and a lower template. The lower template includes a first lower parting surface and a second lower parting surface. A first mold cavity is formed between the first lower parting surface and the second lower parting surface, and the first lower parting surface is lower than the second lower parting surface. The upper template includes a first upper parting surface and a second upper parting surface. A second mold cavity is formed between the first upper parting surface and the second upper parting surface, and the first upper parting surface is lower than the second upper parting surface. After the upper template and the lower template are closed, the first lower parting surface fits the first upper parting surface, and the gap between the first lower parting surface and the first upper parting surface forms the outer parting line of the sealing ring body. The second lower parting surface fits the second upper parting surface, and the gap between the second lower parting surface and the second upper parting surface forms the inner parting line of the sealing ring body. The first mold cavity and the second mold cavity constitute the forming space of the sealing ring body.

[0010] A guiding inclined surface is provided on the side of the lower template, and a guiding convex block adapted to the guiding inclined surface is provided on the upper template.

[0011] The beneficial effects of the present utility model: The present utility model uses half of the second right-angled side of the sealing ring with a right-angled triangle cross-section as the reference plane. By respectively arranging the inner and outer parting lines on the upper and lower sides of the reference plane and avoiding the sealing surface, the sealing surface is relatively smooth. When it is installed in a ball valve, it can be in close contact with the sphere, avoiding the parting line from contacting the sphere and ensuring the reliability of valve sealing; by setting the parting surfaces of the upper and lower templates with a height difference, the inner and outer parting lines avoid the sealing surface. Description of the Drawings

[0012] Figure 1 It is a schematic cross-sectional structure diagram of the sealing ring of the present utility model;

[0013] Figure 2 It is an enlarged cross-sectional view of the sealing ring of the present utility model;

[0014] Figure 3 It is a schematic structural diagram of the mold of the present utility model. Detailed Embodiments

[0015] The following further describes the embodiments of the present utility model with reference to the drawings.

[0016] See Figure 1-2, A sealing ring, comprising a sealing ring body 1. The cross-section of the sealing ring body 1 is a right triangle, including a first right-angled side 11, a second right-angled side 12, and a hypotenuse 13. The joints between the surfaces are provided with rounded corners. The outermost periphery of the rounded corner corresponding to the right angle of the right triangle is the sealing surface 16. Taking the midpoint of the second right-angled side 12 as the reference plane 101, the sealing ring body 1 is provided with an outer parting line 15 and an inner parting line 14. The inner parting line 14 and the outer parting line 15 are respectively arranged on the upper and lower sides of the reference plane 101 and are arranged to avoid the sealing surface 16, making the sealing surface relatively smooth. When it is installed in a ball valve, it can be in close contact with the sphere, avoiding the contact between the parting line and the sphere and ensuring the reliability of the valve seal.

[0017] In this embodiment, the outer parting line 15 is arranged at the outer edge of the rounded corner at the joint of the first right-angled side 11 and the hypotenuse 13, and the inner parting line 12 is arranged at the outer edge of the second right-angled side, avoiding arranging the parting line on the surface corresponding to the hypotenuse 13. When the sealing ring is installed in the groove of the ball valve seat, the surface corresponding to the hypotenuse 13 can be in close contact with the inner wall of the groove. The inner parting line can also be arranged at the outer edge of the rounded corner at the joint of the second right-angled side 12 and the hypotenuse 14. Taking the first right-angled side 11 as the reference line, the distance from the outer parting line 15 to the reference line is less than the distance from the inner parting line 14 to the reference line. The inner parting line 14 and the outer parting line 15 are arranged at different heights, which is convenient for molding.

[0018] See Figure 3 , A mold for manufacturing a sealing ring, comprising an upper template 21 and a lower template 22. The lower template 22 includes a first lower parting surface 221 and a second lower parting surface 222. A first mold cavity 223 is formed between the first lower parting surface 221 and the second lower parting surface 222. The first lower parting surface 221 is lower than the second lower parting surface 222. The first mold cavity 223 is a stepped structure, and its inner wall corresponds to the surfaces corresponding to the first right-angled side 11 and the second right-angled side 12 of the cross-section of the sealing ring body 1. The upper template 21 includes a first upper parting surface 211 and a second upper parting surface 212. A second mold cavity 213 is formed between the first upper parting surface 211 and the second upper parting surface 212. The first upper parting surface 211 is lower than the second upper parting surface 212. The inner wall of the second mold cavity 213 corresponds to the surface corresponding to the hypotenuse 13 of the cross-section of the sealing ring body 1. A guiding inclined surface 24 is provided on the side of the lower template 22, and a guiding convex block 25 adapted to the guiding inclined surface 24 is provided on the upper template 21.

[0019] When manufacturing a sealing ring with this mold, after the upper template 21 and the lower template 22 are closed, the guiding bump 25 cooperates with the guiding inclined surface 24 to ensure accurate positioning of the mold closing position. The first lower parting surface 221 fits against the first upper parting surface 211, and the gap between the first lower parting surface 221 and the first upper parting surface 211 forms the outer parting line of the sealing ring body. The second lower parting surface 222 fits against the second upper parting surface 212, and the gap between the second lower parting surface 222 and the second upper parting surface 212 forms the inner parting line of the sealing ring body. The first mold cavity 223 and the second mold cavity 213 constitute the forming space of the sealing ring body. By setting parting surfaces with a height difference on the upper and lower templates, the inner and outer parting lines are avoided from the sealing surface.

[0020] The embodiments should not be construed as limiting the present invention, and any non-creative improvements based on the spirit of the present invention should be regarded as within the protection scope of the present invention.

Claims

1. A sealing ring, characterized in that: It includes a sealing ring body. The cross-section of the sealing ring body is a right triangle, including a first right-angled side, a second right-angled side, and a hypotenuse. The joints between surfaces are provided with rounded corners. The outermost periphery of the rounded corner corresponding to the right angle of the right triangle is the sealing surface. Taking half of the second right-angled side as the reference surface, the sealing ring body is provided with an outer parting line and an inner parting line. The inner parting line and the outer parting line are respectively arranged on the upper and lower sides of the reference surface and are arranged to avoid the sealing surface.

2. The sealing ring according to claim 1, wherein: The outer parting line is arranged on the outer edge of the rounded corner at the joint of the first right-angled side and the hypotenuse, and the inner parting line is arranged on the outer edge of the second right-angled side.

3. A sealing ring according to claim 1, characterized in that: The outer parting line is arranged on the outer edge of the rounded corner at the joint of the first right-angled side and the hypotenuse, and the inner parting line is arranged on the outer edge of the rounded corner at the joint of the second right-angled side and the hypotenuse.

4. A sealing ring according to claim 2 or 3, characterized in that: Taking the first right-angled side as the reference line, the distance from the outer parting line to the reference line is less than the distance from the inner parting line to the reference line.

5. A mold for manufacturing the sealing ring according to any one of claims 1-4, characterized in that: It includes an upper template and a lower template. The lower template includes a first lower parting surface and a second lower parting surface. A first mold cavity is formed between the first lower parting surface and the second lower parting surface. The first lower parting surface is lower than the second lower parting surface. The upper template includes a first upper parting surface and a second upper parting surface. A second mold cavity is formed between the first upper parting surface and the second upper parting surface. The first upper parting surface is lower than the second upper parting surface. After the upper template and the lower template are closed, the first lower parting surface fits the first upper parting surface, and the gap between the first lower parting surface and the first upper parting surface forms the outer parting line of the sealing ring body. The second lower parting surface fits the second upper parting surface, and the gap between the second lower parting surface and the second upper parting surface forms the inner parting line of the sealing ring body. The first mold cavity and the second mold cavity form the molding space of the sealing ring body.

6. The mold according to claim 5, characterized in that: The side part of the lower template is provided with a guiding inclined surface, and the upper template is provided with a guiding convex block adapted to the guiding inclined surface.

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