Combined plug structure

Abstract

The utility model provides a combined plug structure which comprises a plug body, the plug body is tubular, one end of the plug body is closed, the plug body is made of rubber, and an annular expansion cavity is formed in the open end of the plug body; a fixing plate is fixedly connected to the bottom of the inner side of the plug body, a tubular connecting pipe is arranged on the fixing plate, the outer diameter of the connecting pipe is smaller than the inner diameter of the plug body, and external threads are arranged on the outer side wall of the connecting pipe. The fixing plate and the plug body are provided with a channel communicated with the inner side of the connecting pipe and the expansion cavity. The plug body is axially and fixedly connected with the pipeline through the connecting pipe, and after fluid in the pipeline enters the expansion cavity, the open end of the plug body expands and is tightly attached to the side wall of the pipeline, so that sealing is formed. Compared with the prior art, according to the plugging scheme, no special requirement for axial pressing force exists, and sealing is formed mainly by means of pressure formed by fluid in the pipeline.

Description

Technical Field

[0001] This utility model relates to the field of sealing plug technology, specifically to a combined plug structure. Background Technology

[0002] In existing technologies, when sealing the end of a pipe, a plug is usually inserted into the pipe for sealing. A sealing gasket is placed between the pipe and the plug. The sealing gasket is pressed between the pipe and the plug under axial pressure to achieve a seal.

[0003] Its sealing reliability is highly dependent on the precise control of axial clamping force. When the clamping force is insufficient, the gasket cannot fully fill the interface gap, and the medium is prone to leakage through the gap. When the clamping force is too large, the gasket may fail due to plastic deformation caused by excessive compression, which will also cause leakage risk.

[0004] It is evident that this type of sealing requires high axial clamping force; if the axial clamping force is insufficient, leakage is likely to occur. Utility Model Content

[0005] In view of the problems pointed out in the background art, this utility model proposes a combined plug structure to solve the above-mentioned technical problems.

[0006] The technical solution of this utility model is implemented as follows:

[0007] A composite plug structure includes a plug body, which is tubular and closed at one end, and is made of rubber.

[0008] The plug body has an annular expansion cavity inside its open end;

[0009] A fixing plate is fixedly connected to the bottom of the inner side of the plug body. The fixing plate is provided with a tubular connecting pipe. The outer diameter of the connecting pipe is smaller than the inner diameter of the plug body. The outer wall of the connecting pipe is provided with external threads.

[0010] The fixing plate and the plug body are provided with a channel connecting the inner side of the connecting pipe and the expansion cavity.

[0011] The present invention is further configured such that the fixing plate includes a circular plate and an annular plate arranged axially spaced apart, a connecting rib connecting the circular plate and the annular plate, and a connecting pipe connected to the annular plate.

[0012] The present invention is further configured such that the channel on the plug body is annular and the cross-section of the channel on the plug body is L-shaped.

[0013] The present invention is further configured such that a rigid sleeve is fitted on the outer side of the plug body.

[0014] The present invention is further configured such that the rigid sleeve has multiple through holes distributed thereon.

[0015] The present invention is further configured such that the fixing plate and the connecting pipe are integrally formed and are made of metal or plastic.

[0016] The present invention is further configured such that the connecting pipe and the plug body are coaxially arranged.

[0017] By adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0018] The combined plug structure provided by this utility model has a plug body that is axially fixed to a pipe via a connecting pipe. After the fluid in the pipe enters the expansion chamber, the open end of the plug body expands and adheres tightly to the side wall of the pipe, thus forming a seal. Compared with the prior art, the sealing solution of this application does not have special requirements for axial clamping force, and mainly relies on the pressure generated by the fluid in the pipe to form a seal. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is an exploded view of the present invention.

[0022] Figure 3 This is a cross-sectional view of the present invention.

[0023] Figure 4 This is a schematic diagram of the internal structure of this utility model.

[0024] The following are the labels in the attached diagram: 1. Plug body; 2. Expansion cavity; 4. Connecting pipe; 5. Channel; 6. Circular plate; 7. Ring plate; 8. Connecting rib; 9. Rigid sleeve; 10. Through hole. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] For reference as follows Figures 1-4 The present invention will be described as follows:

[0027] Example: A combined plug structure includes a plug body 1, which is tubular and closed at one end, forming a space to accommodate other components and the end of the pipe.

[0028] The plug body 1 is made of rubber. The excellent elastic deformation ability of rubber provides the basic conditions for sealing.

[0029] The plug body 1 has an annular expansion cavity 2 inside its open end. This is a key structure for achieving a seal, providing space for the fluid to expand and deform after entering.

[0030] A fixing plate is fixedly connected to the bottom inner side of the plug body 1. A tubular connecting pipe 4 is mounted on the fixing plate, coaxially with the plug body 1. The outer diameter of the connecting pipe 4 is smaller than the inner diameter of the plug body 1, and external threads are provided on the outer wall of the connecting pipe 4. This allows the connecting pipe 4 to be threadedly connected to the inner wall of the pipe, achieving axial fixation between the plug and the pipe. Compared to traditional methods relying on axial clamping force, this fixing method is more stable and has relatively lower requirements for assembly precision.

[0031] The fixing plate and connecting pipe 4 are integrated into one piece, made of metal or plastic. This ensures the strength and stability of the connection.

[0032] The fixing plate and plug body 1 are provided with a channel 5 connecting the inner side of the connecting pipe 4 and the expansion chamber 2. The function of the channel 5 is to guide the fluid in the pipe into the expansion chamber 2. When the end of the pipe to be sealed enters between the plug body 1 and the connecting pipe 4, and the initial installation is completed by threading the connecting pipe 4 to the inner wall of the pipe, the fluid in the pipe flows into the expansion chamber 2 through the channel 5.

[0033] When in use, the end of the pipe to be blocked is inserted between the plug body 1 and the connecting pipe 4, and the connecting pipe 4 is threaded to the inner wall of the pipe.

[0034] During operation, as fluid continuously enters the expansion chamber 2, the pressure inside the chamber gradually increases, causing the open end of the plug body 1 to expand and deform. Since the plug body 1 is made of elastic rubber, under pressure, its open end will tightly adhere to the outer wall of the pipe. This sealing method is fundamentally different from existing technologies, which rely on axial clamping force to deform the sealing gasket and fill the gap. This structure primarily relies on the pressure generated by the fluid inside the pipe to achieve a seal, eliminating the stringent requirements for axial tightening force.

[0035] The fixing plate includes axially spaced circular plates 6 and annular plates 7, forming a channel 5 between them. This provides a stable transmission path for fluid to flow from the inside of the connecting pipe 4 to the expansion chamber 2. This spaced layout not only ensures the fixing plate's support and fixation of the connecting pipe 4, but also makes reasonable use of space to construct a fluid channel, avoiding the problem of weakening the fixing plate's strength due to the channel arrangement.

[0036] A connecting rib 8 is provided between the circular plate 6 and the annular plate 7, which not only enhances the connection stability between the two plates, but also provides a certain support for the channel 5, preventing the channel from deforming under fluid pressure and ensuring that the fluid can pass through smoothly.

[0037] Connecting pipe 4 is connected to annular plate 7.

[0038] The channel 5 on the plug body 1 is annular, and the cross-section of the channel 5 on the plug body 1 is L-shaped. The annular channel allows the fluid to flow evenly into the expansion chamber 2, avoiding inconsistent expansion deformation of the plug body 1 due to uneven fluid distribution, thereby ensuring the uniformity of the fit between the open end of the plug body 1 and the outer wall of the pipe, and improving the sealing effect.

[0039] A rigid sleeve 9 is fitted on the outer side of the plug body 1. The rigid sleeve 9 can constrain the outward deformation of the plug body 1. Multiple through holes 10 are distributed on the rigid sleeve 9.

[0040] The rigid sleeve 9 is made of high-strength rigid material, such as metal alloy or engineering plastic, and its hardness and strength are significantly higher than those of the rubber plug body 1. The rigid sleeve 9 is tightly fitted onto the outside of the plug body 1, effectively constraining the direction and extent of deformation of the plug body 1 during operation. When fluid enters the expansion chamber 2 and causes the open end of the plug body 1 to expand, the rigid sleeve 9 restricts excessive outward expansion of the plug body 1. This constraint has multiple benefits: firstly, it prevents uneven pressure distribution between the plug body 1 and the outer wall of the pipe due to excessive expansion, preventing excessive local stress from causing the plug body 1 to rupture or the outer wall of the pipe to be damaged; secondly, it ensures that the expansion deformation of the plug body 1 is mainly directed towards the direction of contact with the outer wall of the pipe, allowing the plug body 1 to achieve a tight seal through a more reasonable deformation pattern, thus improving the stability of the sealing effect.

[0041] In the combined plug structure, after the pipe and connecting pipe 4 are threaded together, the end of the pipe will directly contact the annular plate 7. To further improve the sealing performance of this contact area, a sealing gasket that abuts against the end of the pipe is provided on the annular plate 7. This design complements and optimizes the overall sealing system.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A combined plug structure, comprising a plug body, the plug body being tubular and closed at one end, the plug body being made of rubber, characterized in that: The plug body has an annular expansion cavity inside its open end; A fixing plate is fixedly connected to the bottom of the inner side of the plug body. The fixing plate is provided with a tubular connecting pipe. The outer diameter of the connecting pipe is smaller than the inner diameter of the plug body. The outer wall of the connecting pipe is provided with external threads. The fixing plate and the plug body are provided with a channel connecting the inner side of the connecting pipe and the expansion cavity.

2. The combined plug structure according to claim 1, characterized in that: The fixing plate includes a circular plate and an annular plate spaced apart axially, with a connecting rib between the circular plate and the annular plate, and a connecting pipe connected to the annular plate.

3. The combined plug structure according to claim 2, characterized in that: The channel on the plug body is annular, and the cross-section of the channel on the plug body is L-shaped.

4. The combined plug structure according to claim 1, characterized in that: The outer side of the plug body is fitted with a rigid sleeve.

5. A combined plug structure according to claim 4, characterized in that: The rigid sleeve has multiple through holes.

6. The combined plug structure according to claim 1, characterized in that: The fixing plate and connecting pipe are integrated and made of metal or plastic.

7. The combined plug structure according to claim 1, characterized in that: The connecting pipe is coaxially arranged with the plug body.

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