Double-seal type sealing rubber ring

Abstract

The utility model relates to the technical field of water pipe connection sealing, and particularly discloses a double-seal type sealing rubber ring which is installed in a pipeline sealing groove and comprises a pressure-bearing ring and a rubber ring, the rubber ring comprises a first ball part and a second ball part, the section of the rubber ring is in a double-peak shape, and the outer end of the first ball part is connected with the inner end of the pressure-bearing ring. The rubber ring can still be kept in situ under high pressure through rigid constraint of the pressure-bearing ring, a double-ball-part cooperative sealing mechanism of the rubber ring is adopted, namely, a double-peak structure forms a double-sealing interface (a first ball part main-stage sealing line and a second ball part main-stage sealing line) when being pressed, the two sealing lines are distributed in a stepped mode, and the higher the pressure is, the higher the sealing interface is, the higher the sealing interface is. The larger the deformation amount of the second ball part is, the sealing contact area is dynamically increased, the contact pressure distribution is more uniform, and reliable sealing in the high-pressure environment is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of water pipe connection and sealing, in particular to a double-sealing sealing rubber ring. Background Art

[0002] In the cast iron pipe connection process of water pipe systems, sealing rings play an irreplaceable role as key sealing components. Through the compression and deformation characteristics of elastic materials, they create continuous and uniform contact pressure on the pipe interface end faces, effectively filling microscopic gaps caused by machining precision errors or thermal expansion, achieving zero-leakage transmission of fluid media.

[0003] The O-ring, a commonly used sealing ring in existing technology, has a standardized circular cross-section and is installed in a pipe sealing groove. It relies on compression and rebound force to achieve a seal and is resistant to chemical corrosion and high temperatures. However, when used in water mains, due to the high pressure in the water pipe, the O-ring is easily squeezed into the pipe gap under high pressure, resulting in seal failure. Utility Model Content

[0004] The purpose of the utility model is to provide a double-seal sealing rubber ring to solve the problems mentioned in the above background technology.

[0005] In order to solve the above technical problems, the utility model provides a double-seal sealing rubber ring, which is installed in a pipeline sealing groove, and includes a pressure-bearing ring and a rubber ring. The rubber ring includes a first ball portion and a second ball portion. The cross-section of the rubber ring is a double-peak shape, and the outer end of the first ball portion is connected to the inner end of the pressure-bearing ring.

[0006] Furthermore, the inner diameter of the pressure ring gradually increases from the inner end of the pressure ring to the outer end of the pressure ring.

[0007] Furthermore, the outer end surface of the first ball portion is a first inclined surface that is inclined upward along the outer side of the first ball portion toward the inner side of the first ball portion, and the inner end surface of the pressure ring is adapted to the outer end surface of the first ball portion.

[0008] Furthermore, the angle between the first inclined surface and the horizontal direction is 20°.

[0009] Furthermore, an outer side of the second ball portion and an outer side of the inner end of the pressure ring are both provided with mounting grooves, and the mounting grooves are adapted to the limiting rings on the inner wall of the sealing groove.

[0010] Furthermore, a connecting portion is provided between the first ball portion and the second ball portion, the outer side surfaces of the connecting portion, the first ball portion and the second ball portion are flush, and the inner side of the inner end of the second ball portion is a second inclined surface that tilts upward from the outside to the inside.

[0011] Furthermore, the angle between the inner side surface of the pressure ring and the horizontal direction is 65°.

[0012] The beneficial effects of the present invention are as follows: the present invention enables the rubber ring to remain in place under high pressure through the rigid constraint of the pressure-bearing ring, and the rubber ring double-ball collaborative sealing mechanism, that is, the double-peak structure forms a double sealing interface (first ball main-stage sealing line + second ball main-stage sealing line) when under pressure, and the two sealing lines are distributed in a stepped manner. The higher the pressure, the greater the deformation of the second ball, the dynamic increase of the sealing contact area, and the more uniform the contact pressure distribution, thereby achieving reliable sealing under high-pressure environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic cross-sectional view of an embodiment of the utility model installed in a cast iron pipe.

[0014] Figure 2 It is a schematic cross-sectional structure diagram of an embodiment of the present utility model.

[0015] Among them: 1. Sealing groove; 2. Pressure ring; 3. Rubber ring; 4. Installation groove; 5. Limiting ring; 6. First cast iron pipe; 7. Second cast iron pipe.

[0016] 31. First ball portion; 32. Second ball portion; 33. Connecting portion. DETAILED DESCRIPTION

[0017] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiment described is only one embodiment of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] In order to make the objectives, technical solutions and advantages of this application clearer, this application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] In the following description, references to "one embodiment," "an embodiment," "an example," "an example," etc. indicate that the embodiment or example described may include certain features, structures, characteristics, properties, elements, or limitations, but not every embodiment or example necessarily includes the certain features, structures, characteristics, properties, elements, or limitations. In addition, repeated use of the phrase "according to one embodiment of the present application" may refer to the same embodiment, but does not necessarily refer to the same embodiment.

[0020] like Figure 1-2As shown, the present invention discloses a double-seal rubber seal installed in a pipe sealing groove 1. The seal comprises a pressure-bearing ring 2 and a rubber ring 3. The rubber ring 3 includes a first spherical portion 31 and a second spherical portion 32. The rubber ring 3 has a bimodal cross-section, with the outer end of the first spherical portion 31 connected to the inner end of the pressure-bearing ring 2. The rubber ring 3 employs an asymmetric dual-spherical design (the first spherical portion 31 is connected to the pressure-bearing ring 2, while the second spherical portion 32 is free), resulting in a bimodal cross-section. When the pipe is pressurized, the first spherical portion 31 preferentially expands radially due to the constraint of the pressure-bearing ring 2, forming an initial sealing line with the sidewall of the pipe sealing groove 1. The second spherical portion 32 undergoes secondary radial deformation under the action of the fluid pressure, forming a secondary sealing line. Thus, the bimodal structure forms a dual sealing interface under pressure (the primary sealing line of the first spherical portion 31 and the primary sealing line of the second spherical portion 32). The two sealing lines are distributed in a stepped manner. As the pressure increases, the deformation of the second spherical portion 32 increases, dynamically increasing the sealing contact area and providing a more uniform contact pressure distribution, thus achieving reliable sealing under high-pressure conditions. Furthermore, under high pressure, the deformation of the second ball portion 32 can fill the sealing groove 1, thereby forming an effective seal. The pressure ring 2 is made of a hard material (such as a hard rubber ring) and serves as a support to limit the axial displacement of the first ball portion 31 of the rubber ring 3 under high pressure, preventing it from being squeezed into the pipe gap.

[0021] The utility model enables the rubber ring 3 to remain in place under high pressure through the rigid constraint of the pressure ring 2. The double-ball collaborative sealing mechanism of the rubber ring 3, that is, the double-peak structure, forms a double sealing interface (the main-stage sealing line of the first ball 31 + the main-stage sealing line of the second ball 32) when under pressure. The two sealing lines are distributed in a stepped manner. The higher the pressure, the greater the deformation of the second ball 32, the dynamic increase of the sealing contact area, and the more uniform the contact pressure distribution, thereby achieving reliable sealing under high-pressure environment.

[0022] In one embodiment, the inner diameter of the pressure ring 2 gradually increases from its inner end toward its outer end. Specifically, the inner diameter of the pressure ring 2 adopts a gradually expanding tapered structure (smaller at the inner end and larger at the outer end). When high-pressure fluid acts on the rubber ring 3, the tapered expansion of the inner diameter of the pressure ring 2 forms a mechanical barrier, limiting the outward displacement of the rubber ring 3 (particularly the first ball portion 31), preventing it from being squeezed into the pipe assembly gap by the high pressure, while also facilitating the installation of the water pipe.

[0023] In one embodiment, the outer end surface of the first spherical portion 31 forms a first inclined surface that slopes upward from the outer side of the first spherical portion 31 toward the inner side of the first spherical portion 31. The inner end surface of the pressure ring 2 conforms to the outer end surface of the first spherical portion 31. The outer end surface of the spherical portion adopts an inclined surface that slopes upward from the outer side to the inner side (e.g., at an angle of 15°-30° relative to the horizontal plane), and the inner end surface of the pressure ring 2 forms a complementary inclined surface structure with it, forming a wedge-shaped coupling interface. Under axial installation pressure, the inclined surface converts part of the axial force into radial expansion force, enhancing the initial contact pressure between the first spherical portion 31 and the bottom of the sealing groove 1, further limiting the radial displacement of the rubber ring 3.

[0024] In one embodiment, the angle between the first inclined surface and the horizontal direction is 20°, achieving an optimal balance between installation force and sealing performance.

[0025] In one embodiment, an installation groove 4 is formed on the outer side of the second ball portion 32 and the outer side of the inner end of the pressure ring 2. The installation groove 4 is adapted to the limiting ring 5 on the inner wall of the sealing groove 1, so as to facilitate the stable installation of the sealing ring in the sealing groove 1 and further prevent the sealing ring from moving in the axial direction.

[0026] In one embodiment, a connecting portion 33 is provided between the first spherical portion 31 and the second spherical portion 32. The outer surfaces of the connecting portion 33, the first spherical portion 31, and the second spherical portion 32 are flush. The inner surface of the inner end of the second spherical portion 32 forms a second inclined surface that slopes upward from the outside to the inside. This ensures full contact between the rubber ring 3 and the inner wall of the sealing groove 1, eliminating initial clearance and guiding the directional deformation of the second spherical portion 32 to prevent axial distortion. In this embodiment, the angle between the second inclined surface and the horizontal is 30°.

[0027] In one embodiment, the angle between the inner side surface of the pressure ring 2 and the horizontal direction is 65°.

[0028] The design ideas of this utility model are as follows:

[0029] The sealing ring consists of a pressure ring 2 and a rubber ring 3. The pressure ring 2 is made of a rigid material. The inner diameter of the pressure ring 2 gradually increases from its inner end to its outer end, forming a tapered structure (smaller at the inner end and larger at the outer end), with an angle of 65° to the horizontal. The rubber ring 3 comprises a first bulbous portion 31 and a second bulbous portion 32. Its cross-section is bimodal. The outer end surface of the first bulbous portion 31 has a first inclined surface that slopes upward from the outer end to the inner end, forming an angle of 20° to the horizontal. The inner end surface of the second bulbous portion 32 has a second inclined surface that slopes upward from the outer end to the inner end. The sealing ring is installed with the rubber ring 3 facing inward into the sealing groove 1 inside the first cast iron pipe 6, ensuring that the mounting groove 4 aligns with the retaining ring 5 in the sealing groove 1. The second cast iron pipe 7 is then inserted into the first cast iron pipe 6, passing through the pressure ring 2 and rubber ring 3 in sequence.

[0030] When the second cast iron pipe 7 is pressurized, the first ball 31, constrained by the pressure ring 2, expands radially first, forming an initial seal with the sidewall of the pipe sealing groove 1. The second ball 32, then deforms radially under the fluid pressure, forming a secondary seal. Furthermore, under high pressure, the second ball 32's deformation is sufficient to fill the sealing groove 1, effectively forming a seal.

[0031] The utility model enables the rubber ring 3 to remain in place under high pressure through the rigid constraint of the pressure ring 2. The double-ball collaborative sealing mechanism of the rubber ring 3, that is, the double-peak structure, forms a double sealing interface (the main-stage sealing line of the first ball 31 + the main-stage sealing line of the second ball 32) when under pressure. The two sealing lines are distributed in a stepped manner. The higher the pressure, the greater the deformation of the second ball 32, the dynamic increase of the sealing contact area, and the more uniform the contact pressure distribution, thereby achieving reliable sealing under high-pressure environment.

[0032] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A double-seal rubber ring installed in a pipe sealing groove, characterized by: It comprises a pressure ring and a rubber ring, wherein the rubber ring comprises a first ball portion and a second ball portion, the cross section of the rubber ring is in a double-peak shape, and the outer end of the first ball portion is connected to the inner end of the pressure ring.

2. The double-seal rubber ring according to claim 1, characterized in that: The inner diameter of the pressure ring gradually increases from the inner end of the pressure ring to the outer end of the pressure ring.

3. The double-seal rubber ring according to claim 1, characterized in that: The outer end surface of the first ball portion is a first inclined surface that is inclined upward along the outer side of the first ball portion toward the inner side of the first ball portion, and the inner end surface of the pressure ring is adapted to the outer end surface of the first ball portion.

4. The double-seal rubber ring according to claim 3, characterized in that: The angle between the first inclined surface and the horizontal direction is 20°.

5. The double-seal rubber ring according to claim 1, characterized in that: The outer side of the second ball portion and the outer side of the inner end of the pressure ring are both provided with mounting grooves, and the mounting grooves are adapted to the limiting rings on the inner wall of the sealing groove.

6. The double-seal rubber ring according to claim 1, characterized in that: A connecting portion is provided between the first ball portion and the second ball portion. The outer side surfaces of the connecting portion, the first ball portion and the second ball portion are flush. The inner side of the inner end of the second ball portion is a second inclined surface that tilts upward from the outside to the inside.

7. The double-seal rubber ring according to claim 2, characterized in that: The angle between the inner side surface of the pressure ring and the horizontal direction is 65°.

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