Self-tightening seal ring embedded with expansion agent

Abstract

The application discloses a self-tight sealing ring embedded with an expanding agent, which comprises a soft sealing ring body, a first sealing surface on the outer side of the sealing ring body in the radial direction, a pressure receiving surface on the inner side of the sealing ring body in the radial direction, a second sealing surface on the side of the sealing ring body close to a plug-in pipe, the second sealing surface being attached to the end surface of the plug-in pipe, a connecting piece arranged on the sealing ring body, the sealing ring body being detachably arranged on the plug-in pipe through the connecting piece, an inner ring cavity arranged on the sealing ring body, and an expanding agent arranged in the inner ring cavity. The sealing ring body is sealed with the expanding agent through the inner ring cavity, and the petal-shaped opening weakens the rigidity of the edge position of the sealing ring, so that the outer ring surface of the sealing ring is effectively turned outwards, and the pressure on the end surface of the shaft is simultaneously generated.

Description

Technical Field

[0001] This invention belongs to the field of sealing ring technology, specifically relating to a self-tightening sealing ring with an embedded expansion agent. Background Technology

[0002] PVC pipes are widely used in water transmission. For ease of installation, spigot and socket connections are commonly used. This involves enlarging one end of the spigot and socket pipe and inserting the socket pipe directly into the enlarged end, with a sealing and locking connection at the joint. The sealing performance at the spigot and socket is one of the key factors determining whether the pipeline can successfully complete its transportation task.

[0003] Patent CN205479831U discloses a composite pipe socket joint sealed with neutral silicone filler. The sealing ring is fitted on the outer wall of the plug pipe. After the plug pipe is inserted into the socket pipe, an expanding agent is injected into the sealing ring to expand and seal the gap between the plug pipe and the socket pipe. However, because the sealing ring is fitted on the outer wall of the plug pipe, the outer diameter of the plug pipe is larger than the inner diameter of the socket pipe, making it difficult to insert the plug pipe into the socket pipe and inconvenient to use. In addition, after the medium is introduced into the pipeline, the plug pipe is subjected to axial force. Under pressure, the connection between the plug pipe and the sealing ring is prone to cracking or even separation. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a self-tightening sealing ring with an embedded expanding agent. The expanding agent is sealed within the inner ring cavity, and the petal-shaped opening weakens the edge stiffness of the sealing ring, thereby effectively driving the outer ring of the sealing ring to rotate outwards. This simultaneously generates a clamping force on the shaft end face, achieving a seal between the insertion tube and the receiving tube. Furthermore, the connecting piece ensures that when the expanding agent expands outwards, the inner connecting piece tightly hooks the sealing ring body onto the end of the insertion tube. This prevents the sealing ring from detaching and ensures a stable connection for long-term use.

[0005] The pressure-bearing surface makes the seal tighter when the medium is introduced into the pipe, achieving self-tightening. It has the advantages of simple structure, convenient use, strong adaptability and good sealing performance.

[0006] The embodiments of the present invention are achieved through the following technical solutions:

[0007] A self-tightening sealing ring with embedded expanding agent includes a soft sealing ring body, the outer diameter of the sealing ring body being smaller than the inner diameter of the receiving pipe, the radially outer side of the sealing ring body being a first sealing surface, the side of the sealing ring body near the receiving pipe being a second sealing surface, the second sealing surface being in contact with the end face of the receiving pipe, the sealing ring body being provided with a connector, the sealing ring body being detachably mounted to the receiving pipe via the connector, and the sealing ring body being provided with expanding agent.

[0008] When the expanding agent expands, the outer side of the sealing ring body is pressed outward, so that the first sealing surface is pressed tightly against the inner wall of the receiving pipe, and the second sealing surface is pressed tightly against the end face of the insertion pipe.

[0009] The connector includes a connector body and a locking block. One end of the connector body is connected to the radial inner side of the sealing ring body, and the other end of the connector body is equipped with a locking block. The inner wall of the insertion tube is equipped with a groove that matches the locking block, and the locking block is embedded in the groove.

[0010] Both the clamping block and the slot are annular, and the connecting body has an annular rolled edge.

[0011] There is an annular notch between the slot and the end face of the insertion tube, which matches the connector and is housed within the annular notch.

[0012] The sealing ring body is characterized by having several openings at the end away from the insertion tube.

[0013] The number of openings is at least four, and several openings cut the edge of the sealing ring body into a petal shape.

[0014] The sealing ring body has a pressure-bearing surface on its radial inner side. When a medium is introduced into the receiving pipe, the pressure-bearing surface is pressed, causing part of the sealing ring body to be squeezed into the gap between the insertion pipe and the receiving pipe.

[0015] The pressure-bearing surface is a conical surface, with the large-diameter end of the pressure-bearing surface connected to the first sealing surface, and the small-diameter end of the pressure-bearing surface extending into the insertion tube.

[0016] The sealing ring body is provided with an inner ring cavity, which is connected to a plurality of injection channels. One end of the injection channel away from the inner ring cavity extends to the surface of the sealing ring body, and the expansion agent is injected into the inner ring cavity through the injection channels.

[0017] The sealing ring body is provided with an annular joint, which is connected to the inner annular cavity.

[0018] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0019] (1) The present invention separates the sealing and internal locking devices of PVC pipe plug connection. That is, the slot for connection and fixing is set on the inner wall of the plug pipe, and the first sealing surface and the second sealing surface on the outer side of the sealing ring body are used for sealing. The plug connection and sealing of the sealing ring body do not interfere with each other, making the design more flexible.

[0020] (2) In this invention, the pipe splice seal is set at the axial end of the splice pipe, and the first sealing surface mates with the inner wall of the receiving pipe. The axial relative displacement between the splice pipe and the receiving pipe will not affect the seal, thus facilitating the insertion of the splice pipe into the receiving pipe for sealing. Furthermore, by opening a groove on the inner wall of the splice pipe, when the expanding agent expands and the sealing ring body expands outward, the clamping block located on the inner side presses tightly into the groove, so that the sealing ring body is tightly hooked onto the end of the splice pipe, improving the stability of the connection.

[0021] (3) Compared with the existing PVC pipe R-port sealing ring, the sealing ring of the present invention has a simple structure and is easy to process.

[0022] (4) The sealing ring of the present invention is in a reduced diameter state when installed, which makes it easy to insert the sealing ring into the socket. The sealing ring does not come into contact with the socket pipe during installation, thus preventing the sealing ring from turning over.

[0023] (5) The present invention drives the sealing ring to expand outward by using a delayed expansion agent, and the sealing ring and the sealing surface generate pre-pressure, which has good adaptability to problems such as misalignment of pipe joints, large gaps, and insufficient surface cleanliness.

[0024] (6) The sealing ring of the present invention is sealed with foaming agent through the inner ring cavity. The foaming agent has a large storage capacity and the corresponding expansion deformation is large, which helps the sealing ring overcome the problems of pipe socket error and surface defects.

[0025] (7) The present invention uses an inner ring cavity to seal the expansion agent and the petal-shaped opening to weaken the edge stiffness of the sealing ring, thereby effectively driving the outer ring of the sealing ring to flip outward and simultaneously generating a pressing force on the shaft end face; it can easily achieve the pre-pressure of multiple sealing surfaces.

[0026] (8) By setting a pressure-bearing surface, when the medium is introduced into the pipe and pressure is generated, the pressure-bearing surface is pressed and the soft sealing body is squeezed into the gap between the insertion pipe and the socket pipe, and becomes tighter and tighter, thus achieving a self-sealing effect. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a cross-sectional view of the present invention when it is in the position of the annular joint.

[0029] Figure 2 This is a schematic diagram of the structure of the present invention in its natural state.

[0030] Figure 3 This is a schematic diagram of the structure of the present invention during the expansion of the expanding agent.

[0031] Figure 4 This is a schematic diagram of the structure after expansion and deformation under the constraint of the bearing pipe when the expanding agent expands according to the present invention.

[0032] Figure 5 This is a simplified structural diagram of the present invention under pressure.

[0033] Icons: 1-Sealing ring body, 101-First sealing surface, 102-Second sealing surface, 103-Pressure-bearing surface, 21-Connector, 22-Clamping block, 3-Inner annular cavity, 4-Expansion agent, 5-Slot, 6-Annular notch, 7-Opening, 8-Injection channel, 9-Annular joint, 10-Insertion pipe, 11-Receiving pipe. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0037] In the description of this invention, it should be noted that if terms such as "inner" or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0038] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "configure," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Example

[0040] Please refer to Figures 1-5 This embodiment provides a self-tightening sealing ring with an embedded expanding agent 4, comprising a soft sealing ring body 1. The outer diameter of the sealing ring body 1 is smaller than the inner diameter of the receiving pipe 11. In this embodiment, the sealing ring body 1 is made of rubber material and has an annular structure with a triangular cross-section. The radially outer surface of the sealing ring body 1 is a first sealing surface 101, which is a cylindrical surface. In other embodiments, the first sealing surface 101 may be an annular surface or a conical surface. The side of the sealing ring body 1 closest to the insertion pipe 10 is a second sealing surface 102, which is a plane. In other embodiments, the second sealing surface 102 may be a conical surface or a stepped surface. The second sealing surface 102 is in contact with the end face of the insertion pipe 10. When the second sealing surface 102 is a conical surface or a stepped surface, the second sealing surface 102 is partially in contact with the end face of the insertion pipe 10.

[0041] The sealing ring body 1 is equipped with a connector, and the sealing ring body 1 is detachably mounted on the insertion pipe 10 via the connector; the sealing ring body is equipped with an expanding agent; specifically in this embodiment, the sealing ring body 1 is equipped with an inner ring cavity 3, which is an annular cavity with a circular or elliptical cross-section, and the inner ring cavity 3 is equipped with an expanding agent 4; when the expanding agent 4 is not expanded, the outer diameter of the sealing ring body 1 is less than or equal to the outer diameter of the insertion pipe, thereby facilitating insertion into the receiving pipe 11, and when the expanding agent 4 expands, the sealing ring body 1 deforms due to the expansion of the expanding agent 4, the first sealing surface 101 is turned outward and pressed tightly against the inner wall of the receiving pipe 11, and the second sealing surface 102 is pressed tightly against the end face of the insertion pipe 10, thereby achieving a seal between the insertion pipe 10 and the receiving pipe 11.

[0042] Please refer to Figure 1The connector is located at the junction of the pressure-bearing surface 103 and the second sealing surface 102. The connector includes a connecting body 21 and a clamping block 22. The inner wall of the insertion tube 10 is provided with a groove 5 that matches the clamping block 22. The clamping block 22 is embedded in the groove 5. By opening the groove 5 on the inner wall of the insertion tube 10, when the expanding agent 4 expands and the sealing ring body 1 expands outward, the clamping block 22 located on the inner side is pressed tightly into the groove 5, so that the sealing ring body 1 is tightly hooked onto the end of the insertion tube 10, providing good stability. Furthermore, there is an annular notch 6 between the groove 5 and the end face of the insertion tube 10. This annular notch 6 matches the connecting body 21. When the clamping block 22 is embedded in the groove 5, the connecting body 21 is located within the annular notch 6. The inner diameter of the sealing ring body 1 is less than or equal to the inner diameter of the insertion tube, preventing the connector from protruding from the inner wall of the insertion tube and thus not affecting the flow velocity inside the pipe.

[0043] In this embodiment, in order to improve the stability of the connection between the sealing ring body 1 and the connector 10, both the clamping block 22 and the slot 5 are annular, and the connector 21 has an annular rolled edge.

[0044] Please refer to Figure 1 The sealing ring body 1 has several openings 7 at the end away from the insertion pipe 10. These openings 7 are located at the edge where the pressure surface 103 connects to the first sealing surface 101. At least four openings 7 cut the edge of the sealing ring body 1 into a petal shape. These openings 7 are not connected to the inner annular cavity 3. The cleavage lines of the openings 7 are straight and slope towards the middle region of the inner annular surface. The multiple openings 7 cutting the edge of the sealing ring body 1 into a petal shape weakens the stiffness of the edge of the pressure surface 103 when the expanding agent 4 foams and expands, thereby increasing the outward rotation of the first sealing surface 101.

[0045] Please refer to Figure 1 The sealing ring body 1 has a pressure-bearing surface 103 arranged radially inside. To increase the pressure-bearing area of ​​the pressure-bearing surface 103, the pressure-bearing surface 103 is a conical surface or an arc-shaped annular surface. The large-diameter end of the pressure-bearing surface 103 is connected to the first sealing surface 101, and the small-diameter end of the pressure-bearing surface 103 extends towards the insertion pipe. When a medium is introduced into the receiving pipe 11, the pressure-bearing surface 103 is compressed, causing part of the sealing ring body 1 to be squeezed into the gap between the insertion pipe 10 and the receiving pipe 11, and becoming tighter and tighter, thus achieving a self-sealing effect.

[0046] Please refer to Figure 2 The inner ring cavity 3 is connected to a plurality of injection channels 8. One end of the injection channel 8 away from the inner ring cavity 3 extends to the surface of the sealing ring body 1. The plurality of injection channels 8 are evenly arranged in the circumferential direction of the sealing ring body 1.

[0047] It should be noted that the inner annular cavity 3 is formed by inserting the sealing ring body 1 into the inner mold. In order to facilitate the removal of the inner mold, the sealing ring body 1 is provided with an annular joint 9, which is connected to the inner annular cavity 3. After the inner mold is removed from the annular joint 9, the annular joint 9 is closed by adhesive bonding.

[0048] Please refer to Figure 1 The connections between the first sealing surface 101 and the pressure-bearing surface 103, between the second sealing surface 102 and the first sealing surface 101, and between the pressure-bearing surface 103 and the connecting body 21 are all provided with rounded chamfers.

[0049] It should be noted that the expanding agent 4 is a delayed foaming agent. The expanding agent 4 has a core-shell structure, wherein the core uses sodium bicarbonate particles as the gas generating material, and the outer shell is composed of non-volatile substances after the evaporation of oxidized polyethylene wax emulsion. It can delay the decomposition and gas generation of the sodium bicarbonate core at a temperature higher than its thermal decomposition temperature.

[0050] The principle of this embodiment is described as follows:

[0051] like Figure 1 As shown, the inner mold for preparing the inner annular cavity 3 is removed from the annular joint 9, and then the annular joint 9 is pasted. The locking block 22 of the sealing ring is inserted into the groove 5 at the end of the insertion tube 10.

[0052] like Figure 2 As shown, the sealing ring body 1 at the end of the insertion tube 10 is in a reduced diameter state. The expansion agent 4 is injected into the inner ring cavity 3 through the injection channel 8. Before the expansion agent 4 foams, the insertion tube 10 is inserted into the joint of the receiving tube.

[0053] like Figure 3 As shown, the delayed expansion agent 4 foams and expands, causing the first sealing surface 101 of the sealing ring body 1 to expand outward; in the free state, the first sealing surface 101 expands outward beyond the space where the insertion pipe 10 is located. Multiple openings 7 cut the edge of the sealing ring body 1 into a petal shape, weakening the stiffness of the edge of the first sealing surface 101 so that the degree of outward flipping of the first sealing surface 101 increases.

[0054] like Figure 4 As shown, under the constraint of the receiving pipe 11, the first sealing surface 101 is pressed against the inner wall of the receiving pipe 11, and the first sealing surface 101 is deformed by compression, thereby generating pre-pressure. At the same time, the second sealing surface 102 is pressed tightly against the end face of the insertion pipe 10.

[0055] like Figure 5 As shown, after the medium is introduced into the receiving pipe 11 and pressure is generated, the sealing ring body 1 is inserted into the gap between the receiving pipe 11 and the insertion pipe under the action of internal pressure, and becomes tighter and tighter, thus achieving a self-sealing effect.

[0056] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A self-tightening sealing ring with an embedded expanding agent, characterized in that, The device includes a soft sealing ring body, the outer diameter of which is smaller than the inner diameter of the receiving pipe. The radially outer surface of the sealing ring body is a first sealing surface, and the side of the sealing ring body near the insertion pipe is a second sealing surface, which is in contact with the end face of the insertion pipe. The sealing ring body is equipped with a connector, and the sealing ring body is detachably mounted on the end face of the insertion pipe via the connector. The sealing ring body is also equipped with an expanding agent. When the expanding agent expands, the outer side of the sealing ring body is pressed outward, causing the first sealing surface to press tightly against the inner wall of the receiving pipe, and the second sealing surface to press tightly against the end face of the insertion pipe. The end of the sealing ring body away from the insertion pipe has at least four openings, which cut the edge of the sealing ring body into a petal shape. The radially inner surface of the sealing ring body has a pressure-bearing surface, which is a conical surface. The large-diameter end of the pressure-bearing surface is connected to the first sealing surface, and the small-diameter end of the pressure-bearing surface extends towards the insertion pipe. When a medium is introduced into the receiving pipe, the pressure-bearing surface is compressed, causing part of the sealing ring body to be squeezed into the gap between the insertion pipe and the receiving pipe.

2. The self-tightening sealing ring with embedded expanding agent according to claim 1, characterized in that, The connector includes a connector body and a locking block. One end of the connector body is connected to the radial inner side of the sealing ring body, and the other end of the connector body is equipped with a locking block. The inner wall of the insertion tube is equipped with a groove that matches the locking block, and the locking block is embedded in the groove.

3. The self-tightening sealing ring with embedded expanding agent according to claim 2, characterized in that, Both the clamping block and the slot are annular, and the connecting body has an annular rolled edge.

4. A self-tightening sealing ring with an embedded expanding agent according to claim 2, characterized in that, There is an annular notch between the slot and the end face of the insertion tube, which matches the connector and is housed within the annular notch.

5. A self-tightening sealing ring with an embedded expanding agent according to claim 1, characterized in that, The sealing ring body is provided with an inner ring cavity, which is connected to a plurality of injection channels. One end of the injection channel away from the inner ring cavity extends to the surface of the sealing ring body, and the expansion agent is injected into the inner ring cavity through the injection channels.

6. A self-tightening sealing ring with an embedded expanding agent according to claim 5, characterized in that, The sealing ring body is provided with an annular joint, which is connected to the inner annular cavity.

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