CN210462018U

CN210462018U - Thread clamping and pressing type pipe fitting structure

Info

Publication number: CN210462018U
Application number: CN201921589810.XU
Authority: CN
Inventors: 励行根; 魏世军; 罗文军; 李征
Original assignee: NINGBO TIANSHENG SEALING PACKING CO Ltd
Current assignee: NINGBO TIANSHENG SEALING PACKING CO Ltd
Priority date: 2019-09-23
Filing date: 2019-09-23
Publication date: 2020-05-05
Anticipated expiration: 2029-09-23

Abstract

A thread clamping and pressing type pipe fitting structure is characterized by comprising a joint body, a nut and a sealing assembly; the joint body comprises a pipeline accommodating section and a sealing assembly accommodating section; the pipeline accommodating section is provided with a positioning spigot, and the sealing assembly accommodating section is provided with a sealing assembly accommodating cavity; the outer wall of the accommodating section of the sealing assembly is provided with external threads, and the accommodating section of the sealing assembly is connected with the nut through threads; the seal assembly is disposed within the seal assembly receiving cavity. The utility model discloses a screw thread clamp pressure formula pipe fitting structure, from the angle of chooseing for use the sealing washer, the creative packing sealing ring that uses replaces traditional O type rubber seal, when improving sealing performance, has prolonged the life-span of clamp pressure formula pipe assembly again greatly, and the life-span can be prolonged to more than 20 years by original 3-5 years. Furthermore, the utility model discloses innovate card pressure formula pipe assembly structure, solve the dismouting that current card pressure formula pipe fitting exists frequently, tensile strength scheduling problem inadequately.

Description

Thread clamping and pressing type pipe fitting structure

Technical Field

The utility model relates to a sealed technical field especially relates to a screw thread clamp pressure formula pipe fitting structure.

Background

The clamping and pressing type pipe fitting joint is a commonly used connecting piece in industry and has the characteristics of reliable and safe connection, convenient and fast installation, relatively superior economical efficiency and the like. The working principle of the clamping and pressing type pipe fitting is that a thin-wall stainless steel pipe is inserted into a socket of the clamping and pressing type pipe fitting, the stainless steel pipe is clamped and fixed in the pipe fitting by a special clamping and pressing tool, and the section of a clamping and pressing part is hexagonal. The sealing ring is arranged between the stainless steel pipe and the pipe fitting, so that the stainless steel pipe has the characteristics of leakage prevention, pulling resistance, vibration resistance, high pressure resistance and the like, and can be used in a drinking water system, a tap water system, a heating system, a steam system, an industrial oil pipe system and an industrial gas pipe system.

The clamping and pressing type pipe fitting is widely used on a natural gas transportation pipeline, the traditional clamping and pressing type pipe fitting adopts an O-shaped rubber sealing ring, the O-shaped sealing ring has a self-sealing effect and good sealing performance, but the service life of the pipe fitting is generally short, about 1-2 years, and for the natural gas pipeline, frequent disassembly, assembly and replacement of the sealing ring are very troublesome; meanwhile, the O-shaped sealing ring is adopted, so that the abrasion is large in the air pressure sealing process, lubricating oil needs to be added, and once the sealing ring fails in sealing due to abrasion, major accidents can be caused. At present, in order to prevent such problems, a method of periodically repairing a natural gas pipeline is generally used, but the method consumes a large amount of manpower and material resources. Therefore, the cost performance of the clamping and pressing type pipe fitting sealed by the O-shaped rubber ring is not high in the whole natural gas transportation pipeline.

Aiming at the problem of serious abrasion caused by the fact that an O-shaped sealing ring is selected in a traditional clamping and pressing type pipe fitting, the prior art is also improved to a certain extent, for example, Chinese patent No. CN204164548U discloses a novel clamping and pressing type pipe fitting structure. A ring lip type sealing ring is arranged between the pipe joint and the pipe body of the clamping and pressing type pipe fitting, the pipe joint and the pipe body can form self sealing through the ring lip type sealing ring, and the sealing effect is good. Meanwhile, compared with an O-shaped sealing ring, the service life of the lip-shaped sealing ring is prolonged to a certain extent. However, in the structure, the mechanical tensile strength of the pipe joint and the pipe body is far from insufficient only by adding the lining lantern rings inside and outside the clamping and pressing part, and under the working state, because of the characteristics of medium internal pressure action and self-tightening action of the sealing device, the gasket can be compressed for the second time, so that the sealing performance is improved to a certain extent; however, as the time is prolonged and the number of times of secondary compression is increased, the compression amount of the gasket is continuously close to the compression limit, so that the gasket loses resilience, fatigue failure is caused, sealing failure and medium leakage are caused, and in addition, the O-shaped rubber ring used in the gasket is greatly abraded in a pneumatic environment, so that the service life is reduced.

Disclosure of Invention

The technical solution problem of the utility model is that: overcomes the defects of the prior art and provides a thread clamping and pressing type pipe fitting structure.

The technical solution of the utility model is that:

a thread clamping and pressing type pipe fitting structure comprises a joint body, a nut and a sealing assembly;

the joint body comprises a pipeline accommodating section and a sealing assembly accommodating section; the pipeline accommodating section is provided with a positioning spigot, and the sealing assembly accommodating section is provided with a sealing assembly accommodating cavity; the outer wall of the accommodating section of the sealing assembly is provided with external threads, and the accommodating section of the sealing assembly is connected with the nut through threads; the seal assembly is disposed within the seal assembly receiving cavity.

Furthermore, the sealing assembly comprises a compression ring, a packing sealing ring and a positioning ring which are arranged in sequence.

Further, the seal pack receiving section of the fitting body has an inner diameter that is greater than the outer diameter of the pipe to be joined and the inner diameter of the pipe receiving section.

Furthermore, the sealing assembly of the joint body is accommodated in the cavity, a conical section is arranged at the end far away from the nut along the axial direction of the joint body, and the positioning ring is a conical ring.

Further, the packing seal ring is a graphite seal ring.

Further, the joint body or the connected pipeline or the nut is made of stainless steel materials.

Compared with the prior art, the utility model the advantage lie in:

1. the utility model discloses a screw thread clamp pressure formula pipe fitting structure, from the angle of chooseing for use the sealing washer, the creative packing sealing ring that uses replaces traditional O type rubber seal, when improving sealing performance, has prolonged the life-span of clamp pressure formula pipe assembly again greatly.

2. The utility model discloses a screw thread clamp pressure formula pipe fitting structure when adopting the packing sealing ring to replace traditional O type rubber seal, innovates clamp pressure formula pipe assembly structure, solves the dismouting that current clamp pressure formula pipe fitting exists frequently, tensile strength scheduling problem inadequately.

3. The utility model discloses a screw thread clamp pressure formula pipe fitting structure, adopt flexible graphite sealing ring as packing sealing ring, this kind of sealing ring is being made through the mould pressing by pure graphite through high temperature bulking, sealed principal ingredients content is carbon element, strong acid resistance, the alkali, can use at PH1-PH14 within range, simultaneously high temperature resistant, high pressure, can use within temperature 450 ℃, 10MPa, sealing ring ultraviolet resistance is extremely strong, the material is not ageing, the service life is more than 20 years, be applicable to water, oil, the natural gas, hydrogen, multiple media such as oxygen.

4. The utility model discloses a screw thread clamp pressure formula pipe fitting structure, the outer wall that the seal assembly spare held the section is provided with the external screw thread to the setting holds the outer wall threaded connection's of section nut with the seal assembly spare, the external screw thread with the interior screw-thread fit of nut has improved the tensile strength of pipe assembly.

5. The utility model discloses a screw thread card pressure formula pipe fitting structure adopts by the clamping ring, and the sealing sub-assembly that packing sealing ring and conical ring constitute, through the nut of screwing, the nut compresses tightly the clamping ring and produces the axial force, and this axial force is to the compression of packing sealing ring, and then realizes sealed function, and simultaneously, this axial force produces the extrusion through the conical surface that the transmission of packing sealing ring held the intracavity to the conical ring and the joint body in the sealing sub-assembly, makes the conical ring produce the chucking pipeline that warp to the tensile strength of joint body and pipeline has further been improved.

Drawings

Fig. 1 is a schematic structural view of the thread clamping and pressing type pipe fitting structure of the present invention.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "abutted" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, a thread press-fitting type pipe fitting structure includes a fitting body 100, a nut 300, and a seal assembly; the 100 comprises an integrally formed pipe receiving section 11 and a seal assembly receiving section 12; the pipe receiving section 11 is provided with a positioning spigot 13 for positioning a connected pipe 20, the inner diameter of the seal pack receiving section 12 of the joint body 10 is larger than the outer diameter of the connected pipe 20 and the inner diameter of the pipe receiving section 11, and the seal pack receiving section 12 is provided with a seal pack receiving cavity 14 for receiving a seal pack; the outer wall of the seal assembly accommodating section 12 is provided with an external thread 15, and the seal assembly accommodating section 12 is in threaded connection with a nut 30; the sealing assembly is arranged in the sealing assembly accommodating cavity 14 and comprises a pressing ring 41, a packing sealing ring 42 and a positioning ring 43, the self-sealing assembly accommodating section 12 is arranged along the axial direction of the joint body 10 towards the pipeline accommodating section 11, and the pressing ring 41, the packing sealing ring 42 and the positioning ring 43 are sequentially arranged in the sealing assembly accommodating cavity 14.

Preferably, the end of the sealing assembly receiving cavity 14 of the fitting body 10 remote from the nut 30 in the direction of the fitting body is provided with a tapered segment, and the retaining ring 43 is a tapered ring.

Preferably, the packing seal ring 42 is a graphite seal ring.

Preferably, the fitting body 10 or the connected pipe 20 or the nut 30 is made of stainless steel.

The utility model discloses a method for using of screw thread clamp formula pipe fitting structure, including following step:

s100, placing the seal assembly into the seal assembly accommodating cavity 14 of the seal assembly accommodating section 12, preferably, sequentially placing the positioning ring 43, the packing seal ring 42 and the pressing ring 41.

S200, connecting the nut 30 with the sealing assembly accommodating section 12 of the joint body 10 through threads;

s300, inserting the connected pipeline 20 into the joint body 10 until one end of the connected pipeline 20 inserted into the joint body 10 abuts against the positioning spigot 13;

s400, rotating the nut 20, and matching the external thread 15 of the seal assembly accommodating section 12 with the internal thread of the nut 20 until one end of the seal assembly accommodating section 12, which extends into the nut 20, is abutted against the nut 20. At this moment, the nut 30 compresses the compression ring 41 to generate an axial force, the axial force compresses the graphite sealing ring 42, so that a sealing function is realized, and meanwhile, the axial force is transmitted through the packing sealing ring to extrude the conical surface in the accommodating cavity of the sealing assembly in the conical ring and the joint body, so that the conical ring deforms to clamp the pipeline, and the tensile strength of the joint body and the pipeline is further improved.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A thread clamping and pressing type pipe fitting structure is characterized by comprising a joint body, a nut and a sealing assembly;

2. The threaded clamp-on pipe fitting structure according to claim 1, wherein the seal assembly comprises a compression ring, a packing ring and a positioning ring arranged in sequence.

3. The threaded snap-fit tubular structure of claim 2, wherein the seal pack receiving section of the fitting body has an inner diameter greater than the outer diameter of the pipe to be joined and the inner diameter of the pipe receiving section.

4. The threaded snap-fit pipe fitting structure of claim 2, wherein the seal assembly receiving cavity of the fitting body has a tapered portion disposed along the axis of the fitting body away from the nut end, and the retaining ring is a tapered ring.

5. The threaded snap-fit pipe fitting structure according to claim 2, wherein the packing seal ring is a graphite seal ring.

6. The structure of claim 1, wherein the fitting body or the pipe or nut is made of stainless steel.