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Two-section type pipe thread sealing structure

A technology of sealing structure and pipe thread, which is applied in the field of pipe thread sealing, which can solve the problems such as complicated reapplying sealant process, difficulty for users to reapply sealant, and thread sealant is easy to fall off, etc., so as to achieve reliable sealing connection effect and simple maintenance process Convenient and fast installation effect

Active Publication Date: 2018-11-02
NINGBO AIRTAC AUTOMATIC INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the tapered internal and external threads are mated and locked, a larger tightening force is required than the straight thread. Since the thread sealant filled in the gap between the internal and external threads ensures the seal, the thread sealant is easy to fall off after repeated use, and the seal will fail after the sealant falls off. Hidden danger, the process of reapplying sealant is more complicated, and it is not easy for users to reapply sealant by themselves

Method used

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  • Two-section type pipe thread sealing structure
  • Two-section type pipe thread sealing structure
  • Two-section type pipe thread sealing structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 In the shown embodiment, a two-stage pipe thread sealing structure includes a pipe joint 3 and a connection object 2. The upper end of the pipe joint is connected to the pipe 4 to keep the seal between them, and the lower end of the pipe joint is connected to the connection object. combine figure 2 As shown, the pipe joint is provided with an external thread section 3a and a sealing section 3c, and the sealing section is located at the root of the external thread section. There is an external thread 3b on the external thread section, the surface C where the crest of the external thread is in a cylindrical shape, and the surface B where the bottom of the external thread is conical, shrinking from the root of the external thread to the top of the external thread, so the bottom of the external thread The diameter of the circumference where it is located is gradually reduced by the pipe joint.

[0027] The connection object is provided with an internal t...

Embodiment 2

[0032] Based on the structure of the above-mentioned embodiment 1, such as Figure 5 As shown, the upper end surface and the lower end surface of the sealing ring are respectively provided with end surface ribs 11 . During actual use, the inner and outer diameters of the sealing ring rotate due to different friction forces, and then twist and deform. At this time, the end ribs on the upper and lower end faces can simultaneously seal the pipe joint and the connected object to ensure the sealing effect.

Embodiment 3

[0034] The difference between embodiment 3 and embodiment 1 is that, as Image 6As shown, the sealing ring is provided with a closed inner cavity 1b, the inner cavity and the sealing ring are coaxially arranged, the inner cavity is provided with a thread sealant 1c, and the end of the sealing ring facing the external thread section is provided with a number of evenly distributed blind holes 1d, The outer end of the blind hole is provided with a thin-walled layer 1e whose thickness is smaller than that of the end wall of the cavity. When the pipe joint is tightened, the pipe joint squeezes the connected object, extrudes the thread sealant to the internal and external threads, and the thread sealant flows to fill the gap between the internal and external threads, improving the sealing performance of the pipe joint. When the thread sealant falls off after many times of use, the gasket can be replaced after removing the residual glue. After the internal and external threads are ti...

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Abstract

The invention discloses a two-section type pipe thread sealing structure comprising a pipe connector and a connection object. The pipe connector is provided with an outer thread section and a sealingsection located at the root of the outer thread section. The outer thread section is provided with an outer thread. The plane where the crest of the outer thread is located is cylindrical. The plane where the bottom of the outer thread is located is a retractile cone from the root of the outer thread to the top of the outer thread. The connection object is provided with an inner thread matched with the outer thread section. The sealing section is provided with a sealing conical face. A seal ring is arranged between the end, close to the pipe connector, of the inner thread and the sealing conical face. The two-section type pipe thread sealing structure provided by the invention is reliable in sealing effect and convenient to install and use.

Description

technical field [0001] The invention belongs to the field of pipe thread sealing, in particular to a two-stage pipe thread sealing structure. Background technique [0002] At present, pipe joints are widely used in pressure systems for sealing between pipelines. The pipe joint is usually provided with external threads, and the corresponding connection object is provided with internal threads, and the two threads are connected together. There are mainly two types of sealing structures for pipe threads currently on the market: straight threads and tapered threads. [0003] For straight thread connection, the external thread can be completely screwed into the internal thread, and the thread locking and sealing are guaranteed by the sealing ring. However, it is unreliable to rely on the sealing ring to lock, and it is easy to cause thread loosening and sealing failure in a vibration environment. The contact surface between the sealing ring and the internal thread must be smoot...

Claims

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Application Information

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IPC IPC(8): F16L15/04F16L15/06F16L13/10
CPCF16L13/10F16L15/007F16L15/008F16L15/04F16L15/06
Inventor 王世忠袁培荣俞尚锟毛晨晓
Owner NINGBO AIRTAC AUTOMATIC INDAL
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