High-pressure sealing rubber ring for water conveying pipe

Abstract

The utility model relates to the technical field of water pipe connection and sealing, and particularly discloses a high-pressure sealing rubber ring for a water pipe, which is mounted in a pipeline sealing groove and comprises a pressure-bearing ring and a rubber ring, the rubber ring comprises a ball part and a lip part, the section of the rubber ring is in a double-peak shape, and the outer end of the ball part is connected with the inner end of the pressure-bearing ring. The rubber ring can still keep in situ under high pressure through rigid constraint of the pressure-bearing ring, a double-peak structure of the rubber ring forms a double sealing interface (a ball part main sealing surface and a lip part secondary sealing surface) when being pressed, and meanwhile, elastic deformation of the lip part can compensate gap change caused by expansion caused by heat and contraction caused by cold or vibration of a pipeline to achieve dynamic sealing.

Description

Technical Field

[0001] The utility model relates to the technical field of water pipe connection and sealing, in particular to a high-pressure sealing rubber ring used for water pipes. 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 high-pressure sealing rubber ring for a water pipe to solve the problems mentioned in the above background technology.

[0005] In order to solve the above technical problems, the utility model provides a high-pressure sealing rubber ring for a water pipe, which is installed in a pipe sealing groove. It includes a pressure-bearing ring and a rubber ring. The rubber ring includes a ball portion and a lip portion. The cross-section of the rubber ring is a double-peak shape, and the outer end of the 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 ball portion is an inclined surface that is inclined upward along the outer side of the ball portion toward the inner side of the ball portion, and the inner end surface of the pressure ring is adapted to the outer end surface of the ball portion.

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

[0009] Furthermore, an outer side of the outer end of the lip 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, the angle between the inner side surface of the lip and the horizontal direction is 30°.

[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; the double-peak structure of the rubber ring forms a double sealing interface (primary sealing surface of the ball part + secondary sealing surface of the lip part) when under pressure; at the same time, the elastic deformation of the lip part can compensate for the gap changes caused by thermal expansion and contraction or vibration of the pipeline to achieve dynamic sealing. 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. Ball; 32. Lip. 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 utility model discloses a high-pressure sealing rubber ring for water pipes. It is installed in a sealing groove 1 inside a cast iron pipe. Specifically, when a first cast iron pipe 6 is connected to a second cast iron pipe 7, the second cast iron pipe 7 is inserted into the first cast iron pipe 6. The outer ring of the rubber ring 3 contacts the inner wall of the first cast iron pipe 6, while the inner ring of the rubber ring 3 contacts the inner wall of the second cast iron pipe 7, thereby sealing the connection between the first and second cast iron pipes 6, 7. The rubber ring 3 comprises a pressure ring 2 and a rubber ring 3. The rubber ring 3 includes a ball 31 and a lip 32. The rubber ring 3 has a bimodal cross-section, with the outer end of the ball 31 connected to the inner end of the pressure ring 2. The outer end of the ball 31 is connected to the pressure ring 2 and serves as a supporting body. During installation, it is subjected to axial compression, causing radial expansion, forming initial contact pressure with the wall of the sealing groove 1, providing a long-lasting preload and compensating for macroscopic machining errors. The lip 32 is designed as a thin-walled, arc-shaped structure. Under the action of the axial preload, it expands radially, further contacting the wall of the sealing groove 1. The sharp angles of the lip 32's edge allow it to fit into microscopic gaps, enhancing the sealing effect. This dual-peak structure forms a dual sealing interface (primary sealing surface of the ball 31 + secondary sealing surface of the lip 32) when under pressure. As the medium pressure increases, the fluid pressure pushes the lip 32 further against the pipe's inner wall, achieving a pressure-enhanced seal. The pressure-bearing ring 2, made of a hard material (such as a hard rubber ring), acts as a support, limiting axial displacement of the ball 31 of the rubber ring 3 under high pressure and preventing it from being squeezed into pipe gaps.

[0021] At the same time, when water flows into between the first cast iron pipe 6 and the second cast iron pipe 7, the pressure of the water flow impacts the lip 32, pushing the lip 32 toward the ball part, further forcing the contact area between the lip 32 and the side wall of the sealing groove 1 to increase, thereby enhancing the sealing performance.

[0022] 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-peak structure of the rubber ring 3 forms a double sealing interface (the main sealing surface of the ball part 31 + the secondary sealing surface of the lip part 32) when under pressure. At the same time, the elastic deformation of the lip 32 can compensate for the gap changes caused by thermal expansion and contraction or vibration of the pipeline to achieve dynamic sealing.

[0023] 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 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.

[0024] In one embodiment, the outer end surface of the ball 31 is inclined, sloping upward from the outside toward the inside. The inner end surface of the pressure ring 2 aligns with the outer end surface of the ball 31. The outer end surface of the ball 31 features an inclined surface that slopes upward from the outside toward the inside (e.g., at an angle of 15°-30° relative to the horizontal), while the inner end surface of the pressure ring 2 forms a complementary inclined surface, forming a wedge-shaped coupling interface. Under axial installation pressure, the inclined surface converts some of the axial force into radial expansion force, enhancing the initial contact pressure between the ball 31 and the bottom of the sealing groove 1 and further limiting radial displacement of the rubber ring 3.

[0025] In one embodiment, the angle between the inclined surface and the horizontal direction is 20°, achieving an optimal balance between installation force and sealing performance.

[0026] In one embodiment, an installation groove 4 is formed on the outer side of the outer end of the lip 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.

[0027] In one embodiment, the angle between the inner side surface of the lip 32 and the horizontal direction is 30°.

[0028] In one embodiment, the angle between the inner side surface of the pressure ring 2 and the horizontal direction is 65°.

[0029] The design ideas of this utility model are as follows:

[0030] 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 the inner end to the outer end of the pressure ring 2. That is, 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), with an angle of 65° with the horizontal. The rubber ring 3 includes a bulb 31 and a lip 32. The cross-section of the rubber ring 3 is bimodal. The outer end surface of the bulb 31 is inclined upward from the outer side to the inner side, with an angle of 20° with the horizontal. The lip 32 and the inner side surface form an angle of 30° with the horizontal. The rubber ring 3 of the sealing ring is installed inwardly into the sealing groove 1 inside the first cast iron pipe 6, so that the installation groove 4 is compatible 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.

[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-peak structure of the rubber ring 3 forms a double sealing interface (the main sealing surface of the ball part 31 + the secondary sealing surface of the lip part 32) when under pressure. At the same time, the elastic deformation of the lip 32 can compensate for the gap changes caused by thermal expansion and contraction or vibration of the pipeline to achieve dynamic sealing.

[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 high-pressure sealing rubber ring for a water pipe, installed in a pipe sealing groove, characterized by: It comprises a pressure-bearing ring and a rubber ring, wherein the rubber ring comprises a ball portion and a lip portion, the cross section of the rubber ring is in a double-peak shape, and the outer end of the ball portion is connected to the inner end of the pressure-bearing ring.

2. A high-pressure sealing rubber ring for a water pipe 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 high-pressure sealing rubber ring for a water pipe according to claim 1, characterized in that: The outer end surface of the ball portion is an inclined surface that is inclined upward along the outer side of the ball portion toward the inner side of the ball portion, and the inner end surface of the pressure ring is adapted to the outer end surface of the ball portion.

4. The high-pressure sealing rubber ring for a water pipe according to claim 3, characterized in that: The angle between the inclined surface and the horizontal direction is 20°.

5. The high-pressure sealing rubber ring for a water pipe according to claim 1, characterized in that: The outer side of the outer end of the lip 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 high-pressure sealing rubber ring for a water pipe according to claim 1, characterized in that: The included angle between the inner side surface of the lip and the horizontal direction is 30°.

7. The high-pressure sealing rubber ring for a water pipe 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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