A delayed expansion agent driven self-tightening seal

Abstract

The application discloses a self-tight sealing ring driven by delayed expansion agent, which comprises a sealing ring body, a soft sealing body arranged on the radial outer side of the sealing ring body, a first sealing ring surface on the outer side of the soft sealing body, a second sealing ring surface on the side of the soft sealing body close to a plug-in pipe, a pressure receiving surface arranged on the radial inner side of the sealing ring body, a rotating connection part arranged on the sealing ring body and connected with the end surface of the plug-in pipe, a plurality of counterbores arranged on the end surface of the plug-in pipe, and an expansion agent and a piston rod arranged in the counterbores. The piston rod is driven by the delayed expansion agent to top the outer turning of the sealing ring body, the first sealing ring surface is in contact with the inner wall of the receiving pipe to generate a pre-pressure, the second sealing ring surface is in contact with the end surface of the plug-in pipe to generate a pre-pressure, and the pressure receiving surface makes the sealing more tight when the medium is introduced into the pipe to realize self-tightness. The self-tight sealing ring has good adaptability to problems such as misalignment of the pipe plug-in part, large gap, and insufficient surface cleanliness.

Description

Technical Field

[0001] This invention belongs to the field of sealing ring technology, and specifically relates to a self-tightening sealing ring driven by a delayed 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 CN201520343854.X discloses a PVC pipe connection structure that uses an internal connection. The enlarged section features a protruding arc-shaped structure called the "R-joint," where a sealing ring and locking element are used. This type of sealing ring has a complex structure, and the sealing ring and locking element interact within the limited space of the R-joint. Axial displacement of the locking element affects the fit between the sealing element and the tapered joint. Under axial force and internal pressure on the pipe, the R-joint deforms, directly affecting the sealing effect of the socket joint.

[0004] Based on the above background, a new type of sealing ring is designed to solve the problem of mutual interference between the sealing and locking mechanisms of PVC pipe splices, and to solve the problem of the sealing effect being affected by the deformation of the existing PVC pipe splice parts. This has practical significance and application prospects. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a self-tightening sealing ring driven by a delayed expansion agent. The sealing ring body is externally rotated by a top rotating part, with the first sealing ring surface contacting the inner wall of the receiving pipe and generating pre-pressure, and the second sealing ring surface contacting the end face of the insertion pipe and generating pre-pressure. Furthermore, the pressure-bearing surface ensures a tighter seal when a medium is introduced into the pipe, achieving self-tightening. This design offers advantages such as 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 seal driven by a delayed expansion agent, comprising:

[0008] A sealing ring body is disposed on the end face of the insertion pipe, and the sealing ring body has a shaft end face that fits against the end face of the insertion pipe. The radial outer surface of the sealing ring body is a first sealing ring surface, and a second sealing ring surface is provided between the first sealing ring surface and the shaft end face.

[0009] A rotating connecting part is disposed on the shaft end face of the sealing ring body, and the rotating connecting part is rotatably connected to the insertion pipe; and

[0010] The top rotating part is disposed at the end of the insertion tube and is used to abut against the shaft end face so that the sealing ring body flips outward with the rotating connection part as the base point. When the sealing ring body flips outward with the rotating connection part as the base point, the first sealing ring surface is tightly attached to the inner wall of the receiving tube and the second sealing ring surface is tightly attached to the end face of the insertion tube.

[0011] The top rotating part includes an expanding agent and a piston rod. The end face of the insertion pipe is provided with a countersunk hole that matches the piston rod. The piston rod is movably disposed in the countersunk hole. The expanding agent is disposed in the countersunk hole. When the expanding agent is in an expanded state, the expanding agent drives the piston rod to extend out of the countersunk hole and top the sealing ring to flip outward.

[0012] The sealing ring body is also provided with a pressure-bearing surface on its radial inner side; so that when the medium is introduced into the receiving pipe, the medium applies pressure to the pressure-bearing surface, causing the sealing ring body to partially deform and squeeze into the gap between the insertion pipe and the receiving pipe.

[0013] The rotating connection includes a rotating component and a clamping component. The rotating component is rotatably connected to the sealing ring body. The clamping component is connected to the rotating component. The end face of the insertion pipe is provided with a groove that matches the clamping component. The clamping component is fitted into the groove.

[0014] The first sealing ring surface is a conical surface. The larger end of the first sealing ring surface is connected to the second sealing ring surface, and the smaller end of the first sealing ring surface extends away from the end face of the insertion pipe and connects to the pressure surface.

[0015] The second sealing ring surface is a conical surface. The small diameter end of the second sealing ring surface extends to the rotating connection part, and the large diameter end of the second sealing ring surface extends to connect to the first sealing ring surface.

[0016] A groove is provided between the second sealing ring surface and the rotating connection surface, and the groove is in contact with the rotating connection part.

[0017] The pressure-bearing surface is an arc-shaped annular surface.

[0018] The shaft end face is provided with a top plate, which is correspondingly arranged with the piston rod.

[0019] The foaming agent is a delayed foaming agent.

[0020] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0021] (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 end face of the plug pipe, and the first sealing ring surface and the second sealing ring surface on the outside 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.

[0022] (2) The present invention provides a countersunk hole on the end face of the insertion pipe, and provides an expanding agent and a piston rod in the countersunk hole. The expanding agent expands and drives the piston rod to extend. The piston rod presses against the sealing ring body and causes it to flip outward with the rotating connection part as the base point, so that the first sealing ring surface is tightly attached to the inner wall of the receiving pipe and the second sealing ring surface is tightly attached to the end face of the insertion pipe, thereby achieving a seal between the insertion pipe and the receiving pipe.

[0023] (3) 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 receiving pipe, and the pressure becomes tighter and tighter, thus achieving a self-sealing effect.

[0024] (4) The present invention sets the pipe insertion seal at the axial end of the insertion pipe, and the first sealing ring surface cooperates with the inner wall of the receiving pipe. The axial relative displacement between the insertion pipe and the receiving pipe will not affect the seal, thereby facilitating the insertion pipe to be inserted into the receiving pipe for sealing.

[0025] (5) 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;

[0026] (6) The sealing ring of the present invention is in a reduced diameter state when installed, which facilitates the insertion of the sealing ring into the socket. The sealing ring does not contact the socket pipe during installation, preventing the sealing ring from turning over.

[0027] (7) 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. Attached Figure Description

[0028] 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.

[0029] Figure 1 This is a schematic diagram of the structure of the present invention in its natural state;

[0030] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0031] Figure 3 This is a schematic diagram of the structure of the present invention during the expansion of the expanding agent;

[0032] Figure 4 This is a schematic diagram of the structure of the present invention after expansion and deformation under the constraint of the bearing pipe when the expanding agent expands;

[0033] Figure 5 This is a simplified structural diagram of the present invention under pressure.

[0034] Icons: 1-Sealing ring body, 101-First sealing ring surface, 102-Second sealing ring surface, 103-Pressure surface, 104-Shaft end face, 105-Groove, 2-Rotating connection, 21-Rotating component, 22-Clamping component, 3-Counterhole, 4-Expanding agent, 5-Piston rod, 6-Slot, 7-Top plate, 8-Insertion pipe, 9-Receiving pipe. Detailed Implementation

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Example

[0041] Please refer to Figure 1-5 This embodiment provides a self-tightening seal ring driven by a delayed expansion agent, including a seal ring body 1, a rotating connecting part 2, and a top rotating part.

[0042] The sealing ring body 1 has an annular structure and is disposed on the end face of the insertion tube 8. The sealing ring body 1 has a shaft end face 104 that fits against the end face of the insertion tube 8. The radial outer surface of the sealing ring body 1 is a first sealing ring surface 101, and a second sealing ring surface 102 is provided between the first sealing ring surface 101 and the shaft end face 104. In this embodiment, the sealing ring body 1 is made of rubber material, which has a certain deformation capability.

[0043] The rotating connection part 2 is disposed on the shaft end face 104 of the sealing ring body 1. The rotating connection part 2 can be rotatably connected to the insertion pipe 8. The sealing ring body 1 can be flipped outward using the rotating connection part 2 as a base point. The rotating connection part 2 is used to make the sealing ring body 1 in a reduced diameter state during installation, so as to facilitate the insertion pipe 8 to be inserted into the receiving pipe 9 for sealing.

[0044] The top rotating part is disposed at the end of the insertion tube 8, with the axis of the insertion tube 8 as the center. The distance between the top rotating part and the axis is less than the distance between the rotating connection part 2 and the axis of the insertion tube 8, so that when the top rotating part abuts the shaft end face 104, the sealing ring body 1 flips outward with the rotating connection part 2 as the base point. When the sealing ring body 1 flips outward with the rotating connection part 2 as the base point, the first sealing ring surface 101 is tightly attached to the inner wall of the receiving tube 9, and the second sealing ring surface 102 is tightly attached to the end face of the insertion tube 8, thereby achieving a seal between the insertion tube 8 and the receiving tube 9.

[0045] Please refer to the figure. The top rotating part includes an expanding agent 4 and a piston rod 5. To ensure the top rotating effect of the top rotating part on the sealing ring body 1, the number of the top rotating parts is at least two, and the top rotating parts are arranged symmetrically with the axis of the insertion pipe 8 as the center. The end face of the insertion pipe 8 is provided with a countersunk hole 3 that matches the piston rod 5. The piston rod 5 is a cylindrical structure. The end face of the piston rod 5 near the expanding agent 4 is flat or groove 105, and the end face away from the expanding agent 4 is spherical. The expanding agent 4 and the piston rod 5 are arranged in the same straight line, and the expanding agent 4 is located inside the countersunk hole 3. After the expanding agent 4 is filled into the countersunk hole 3, the piston rod 5 is placed. Before the expansion agent 4 foams, the piston is fully retracted into the counterbore 3. When the expansion agent 4 foams and expands, the piston rod 5 pushes against the sealing ring body 1, causing it to flip outward with the rotating connection part 2 as the base point, so that the first sealing ring surface 101 is tightly attached to the inner wall of the receiving pipe and the second sealing ring surface 102 is tightly attached to the end face of the insertion pipe 8. By utilizing the delayed expansion effect of the expansion agent 4, the insertion pipe 8 achieves self-sealing after being inserted into the receiving pipe 9.

[0046] Furthermore, in this embodiment, a pressure-bearing surface 103 is also provided on the radially inner side of the sealing ring body 1; so that when a medium is introduced into the receiving pipe 9, the medium applies pressure to the pressure-bearing surface 103, causing the sealing ring body 1 to partially deform and squeeze into the gap between the insertion pipe 8 and the receiving pipe 9, and becoming tighter and tighter, thus achieving a self-sealing effect. Please refer to... Figure 1 In order to increase the pressure on the sealing ring body 1 when the medium is introduced, the pressure-bearing surface 103 is an arc-shaped annular surface, and in some other embodiments, the pressure-bearing surface 103 is a conical surface.

[0047] Please refer to Figure 1 and Figure 2 The rotating connection part 2 includes a rotating component 21 and a clamping component 22. The rotating component 21 is connected to the sealing ring body 1, and the clamping component 22 is connected to the rotating component 21. The rotating component 21 can rotate or bend, and the rotation or bending of the rotating component 21 is used to achieve the rotation and outward turning of the sealing ring body 1. In order to improve the stability of the connection with the insertion tube 8, the clamping component 22 in this embodiment is annular. The end face of the insertion tube 8 is provided with an annular groove 6 that matches the clamping component 22. In order to further clamp the clamping component 22, the opening end of the groove 6 is narrower and the inside of the groove 6 is wider. The clamping component 22 is fitted into the groove 6. It should be noted that both the rotating component 21 and the clamping component 22 in this embodiment are made of rubber material, and the rotating connection part 2 is integrally formed with the sealing ring body 1.

[0048] Please refer to Figure 1 The first sealing ring surface 101 is a conical surface. In other embodiments, the first sealing ring surface 101 is a cylindrical surface or an arc-shaped ring surface. The larger end of the first sealing ring surface 101 is connected to the second sealing ring surface 102. The smaller end of the first sealing ring surface 101 extends away from the end face of the insertion pipe 8 and connects to the pressure surface 103. By using the conical first sealing ring surface 101, the sealing ring body 1 is in a reduced diameter state under normal conditions, which facilitates the insertion of the sealing ring body 1 into the receiving pipe.

[0049] Please refer to Figure 1 and Figure 2 To facilitate the sealing ring body 1 to flip outward for sealing, the second sealing ring surface 102 is a conical surface. The small-diameter end of the second sealing ring surface 102 extends to the rotating connection part 2, and the large-diameter end of the second sealing ring surface 102 extends to connect to the first sealing ring surface 101. Furthermore, the second sealing ring surface 102 is provided with a groove 105, which connects to the rotating connection part 2. This groove 105 facilitates the contact and compression between the second sealing ring surface 102 and the end face of the insertion pipe 8.

[0050] Please refer to Figure 1The shaft end face 104 is a plane, and the shaft end face 104 mates with the end face of the insertion tube 8, which has a limiting function for the sealing ring body 1. One end of the shaft end face 104 is connected to the pressure surface 103, and the other end of the shaft end face 104 is connected to the second sealing ring surface 102. The shaft end face 104 is provided with a top plate 7, which is made of a hard material. The top plate 7 is correspondingly arranged with the piston rod 5, and the top plate 7 is used to facilitate the piston rod 5 to push the sealing ring body 1 outward.

[0051] It should be noted that the expanding agent 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, which can delay the decomposition and gas generation of the sodium bicarbonate core at a temperature higher than its thermal decomposition temperature.

[0052] Please refer to the figure. The connection between the shaft end face 104 and the pressure surface 103, between the pressure surface 103 and the first sealing ring surface 101, and between the first sealing ring surface 101 and the second sealing ring surface 102 are all provided with rounded chamfers.

[0053] The principle of this embodiment is described as follows:

[0054] like Figure 1 As shown, the rotating part 21 and the clamping part 22 of the sealing ring body 1 are inserted into the groove 6 at the end of the insertion tube 8, and the clamping part 22 is locked into the groove 6 to fix the sealing ring body 1. At this time, the sealing ring body 1 is in a reduced diameter state. An expanding agent 4 is injected into the countersunk hole 3 at the end of the insertion tube 8. Before the expanding agent 4 foams, the insertion tube 8 is inserted into the joint of the receiving tube 9.

[0055] like Figure 3 As shown, the expanding agent 4 foams and expands, and the piston rod 5, driven by the expanding agent 4, pushes against the top plate 7. The piston rod 5 pushes the sealing ring body 1 out and flips it outward. The sealing ring body 1 flips outward with the connecting rotating part as the reference. The second sealing ring surface 102 presses tightly against the end face of the insertion pipe 8, and the first sealing ring surface 101 tilts outward and exceeds the outer diameter of the insertion pipe 8.

[0056] like Figure 4 As shown, under the constraint of the receiving pipe 9, the first sealing ring surface 101 is pressed against the inner cylindrical surface of the receiving pipe, thereby generating pre-pressure.

[0057] like Figure 5 As shown, after the medium is introduced into the receiving pipe 9 to generate pressure, the sealing ring body 1 is inserted into the gap between the insertion pipe 8 and the receiving pipe under the action of internal pressure, and becomes tighter and tighter, thus achieving a self-sealing effect.

[0058] 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 driven by a delayed expansion agent, characterized in that, include: A sealing ring body is disposed on the end face of the insertion pipe, and the sealing ring body has a shaft end face that fits against the end face of the insertion pipe. The radial outer surface of the sealing ring body is a first sealing ring surface, and a second sealing ring surface is provided between the first sealing ring surface and the shaft end face. A rotating connecting portion is disposed on the shaft end face of the sealing ring body, and the rotating connecting portion is rotatably connected to the insertion pipe; and, A top-rotating part, disposed at the end of the insertion tube, is used to abut against the end face of the shaft to cause the sealing ring body to flip outward with the rotating connection part as the base point. When the sealing ring body flips outward with the rotating connection part as the base point, the first sealing ring surface is tightly attached to the inner wall of the receiving tube, and the second sealing ring surface is tightly attached to the end face of the insertion tube. The top-rotating part includes an expanding agent and a piston rod. The end face of the insertion tube is provided with a countersunk hole that matches the piston rod. The piston rod is movably disposed in the countersunk hole. The expanding agent is disposed in the countersunk hole. When the expanding agent is in an expanded state, the expanding agent drives the piston rod to extend out of the countersunk hole and abut against the seal ring to flip outward. The expanding agent is a delayed foaming agent.

2. The self-tightening sealing ring driven by a delayed expansion agent according to claim 1, characterized in that, The sealing ring body is also provided with a pressure-bearing surface on its radial inner side; so that when the medium is introduced into the receiving pipe, the medium applies pressure to the pressure-bearing surface, causing the sealing ring body to partially deform and squeeze into the gap between the insertion pipe and the receiving pipe.

3. The self-tightening sealing ring driven by a delayed expansion agent according to claim 2, characterized in that, The pressure-bearing surface is an arc-shaped annular surface.

4. The self-tightening sealing ring driven by a delayed expansion agent according to claim 1, characterized in that, The rotating connection includes a rotating component and a clamping component. The rotating component is rotatably connected to the sealing ring body. The clamping component is connected to the rotating component. The end face of the insertion pipe is provided with a groove that matches the clamping component. The clamping component is fitted into the groove.

5. The self-tightening sealing ring driven by a delayed expansion agent according to claim 1, characterized in that, The first sealing ring surface is a conical surface. The larger end of the first sealing ring surface is connected to the second sealing ring surface, and the smaller end of the first sealing ring surface extends away from the end face of the insertion pipe and connects to the pressure surface.

6. The self-tightening sealing ring driven by a delayed expansion agent according to claim 1, characterized in that, The second sealing ring surface is a conical surface. The small diameter end of the second sealing ring surface extends to the rotating connection part, and the large diameter end of the second sealing ring surface extends to connect to the first sealing ring surface.

7. A self-tightening sealing ring driven by a delayed expansion agent according to claim 6, characterized in that, A groove is provided between the second sealing ring surface and the rotating connection part, and the groove is in contact with the rotating connection part.

8. The self-tightening sealing ring driven by a delayed expansion agent according to claim 1, characterized in that, The shaft end face is provided with a top plate, which is correspondingly arranged with the piston rod.

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