KR101760064B1 - Fitting mechanism for use with multilayer composite pipe - Google Patents

Fitting mechanism for use with multilayer composite pipe Download PDF

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Publication number
KR101760064B1
KR101760064B1 KR1020150160602A KR20150160602A KR101760064B1 KR 101760064 B1 KR101760064 B1 KR 101760064B1 KR 1020150160602 A KR1020150160602 A KR 1020150160602A KR 20150160602 A KR20150160602 A KR 20150160602A KR 101760064 B1 KR101760064 B1 KR 101760064B1
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KR
South Korea
Prior art keywords
distal end
ferrule
fitting
inclined surface
fitting body
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KR1020150160602A
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Korean (ko)
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KR20170057516A (en
Inventor
이준배
안경욱
홍원식
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주식회사 로도에이치
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Priority to KR1020150160602A priority Critical patent/KR101760064B1/en
Publication of KR20170057516A publication Critical patent/KR20170057516A/en
Application granted granted Critical
Publication of KR101760064B1 publication Critical patent/KR101760064B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
    • F16L25/14—Joints for pipes of different diameters or cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
    • F16L15/08—Screw-threaded joints; Forms of screw-threads for such joints with supplementary elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/06—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/06—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends
    • F16L19/07—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends adapted for use in socket or sleeve connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
    • F16L25/02—Electrically insulating joints or couplings

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gasket Seals (AREA)

Abstract

According to the present invention, there is provided a composite pipe fitting structure used for hermetically sealing a multi-layered composite pipe having a metal layer inside and a plastic layer on its outer surface, comprising a first threaded portion formed to be engaged with the plastic layer at the tip of the composite pipe, A second threaded portion formed on an inlet side of the fitting body, a first inclined surface formed between the first threaded portion and the second threaded portion, and a coupling end portion disposed on the opposite side of the first inclined surface with the first threaded portion interposed therebetween, ; A fitting body A second inclined surface formed corresponding to the first inclined surface, and a third screwed portion engaged with the second screwed portion; Contact prevention means disposed between the engagement distal end of the fitting body and the distal end of the composite tube; And a cover ring mounted on the distal end of the ferrule body, wherein the tip of the composite tube is pressed onto the coupling end of the fitting body by the coupling of the composite tube and the first threaded portion of the fitting body, The first inclined face of the body and the second inclined face of the ferrule body are airtightly adhered to each other while the ferrule body deformed portion is deformed by the first inclined face of the fitting body to dig the plastic layer of the composite pipe, And the covering is disposed between at least any one of the first inclined surface and the second inclined surface and between the plastic layer and the distal end of the ferrule body.

Description

[0001] FITTING MECHANISM FOR USE WITH MULTILAYER COMPOSITE PIPE [0002]

TECHNICAL FIELD The present invention relates to a fitting structure for maintaining the airtightness of a composite pipe having a multi-layered structure having an outer layer made of plastic, and more particularly to a fitting structure for a composite pipe which can more reliably maintain the airtightness of the composite pipe even under high temperature, .

A variety of pipes (tubes, pipes) used as a fluid flow means are hermetically sealed to prevent fluid leakage at the connection, fittings having a structure and material suitable for the characteristics of the tube are used.

Generally, a metal pipe is a high-pressure pipe, and a ferrule-type fitting structure is widely used. In the case of a plastic pipe, since it is used at a relatively low pressure, a fusion bonding method of a plastic having a simple structure, , Or a simple one-touch byte type.

Recently, a plastic composite pipe used as a water pipe or a low-pressure gas pipe has begun to be applied as a high-pressure pipe, and a suitable fitting has been made. However, most of the conventional fittings are used as they are, Or it becomes a burden on the installation economically.

Particularly, in the method of installing the fitting body in the inside of the pipe and pressing the sleeve from the outside, the body installed inside interferes with the fluid flowing inside the pipe, thereby reducing the efficiency of the whole system.

In addition, when the connection part is mounted on a system of a copper system such as an air conditioner, the body of the fitting should be made of a copper alloy such as brass in order to prevent galvanic corrosion. There is a disadvantage in that the airtightness is lowered.

In addition, when the temperature difference is set at a place where the temperature difference is high, there is a disadvantage that the risk of leakage increases due to repeated shrinkage and expansion due to the temperature change.

In the case of manufacturing using iron as a material, there is a disadvantage in that it requires economical burden and complicated structure because a plurality of separate plastic parts are required to be interposed in order to insulate the metal.

A typical fitting that is coupled to the outside of the pipe without disturbing the flow of the fluid is a conventional method using a ferrule. This structure is mainly applied to a metal pipe and is effectively used for a semiconductor line and the like.

The paralle type is divided into a front paralle and a rear paralle so that the front paralle is deformed by the compressive force of the rear paralle so that the outer surface of the pipe and the fitting body are closely contacted to maintain airtightness. Recently, a single paralel has been developed, to be.

However, since the paralle type is not developed for a composite pipe having a plastic envelope, it is disadvantageous in that it is economically burdensome to use as it is made of unnecessary oversized design. When the paralle type is combined with an excessive compression force to a plastic envelope having a very low hardness There is a disadvantage that leakage occurs along with damage of the pipe shell at a high temperature.

Also, when used in a place with a large temperature deviation under high pressure, if it is used for a long time due to a difference in thermal expansion coefficient between the shell plastic and the metal fitting, there is a risk of leakage due to a minute gap between the metal and the plastic. There is a disadvantage in that, under the high-temperature environment above a certain level, the portion where the ferrule is joined to the outer surface of the pipe produces pressure concentration and the outer plastic can not withstand and is destroyed.

Therefore, the conventional ferrule type fitting structure can not be used under high temperature and high pressure.

The present invention can simplify a fitting body and a ferrule structure which fix a shell plastic of a pipe by screwing to constitute a monolithic ferrule body and withstand the pressure applied to the pipe shell under high temperature and high pressure, The fitting portion and the parallel portion provide a fitting structure that can be used through cooperation and complementary action.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a fitting structure for a composite pipe having a structure in which a composite pipe having a plastic shell is combined with a shell so as not to interfere with the flow of fluid when used under high- have.

Another object of the present invention is to provide a fitting structure for a composite pipe which is adapted to a conventional paralle type fitting structure and which provides a combined type fitting structure suitable for a plastic sheath and double the airtightness maintaining effect.

Another object of the present invention is to provide a composite pipe fitting structure which can be used even in an environment with a large temperature deviation by minimizing the airtightness breakdown due to the difference in thermal expansion between the metal and the plastic of the composite pipe.

According to another aspect of the present invention, there is provided a composite fitting structure for use in hermetically sealing a multi-layered composite pipe having a metal layer therein and a plastic layer, the hollow fitting body comprising: A first screw portion formed to be engaged with the plastic layer at a tip end of the composite pipe inserted into the inside of the composite pipe, a second screw portion formed at an inlet side of the fitting body into which the distal end of the composite pipe is inserted, The fitting body including a first inclined face formed between the two screw portions, and a fitting end portion disposed on the opposite side of the first inclined face with the first screw portion interposed therebetween; Wherein the ferrule has a hollow parallelepiped body into which the distal end of the composite tube is inserted, wherein a distal end of the ferrule has a second inclined surface formed corresponding to the first inclined surface and a third threaded portion adapted to be engaged with the second screwed portion, Body; Contact prevention means disposed between the engagement distal end of the fitting body and the distal end of the composite tube; And a cover ring mounted on the distal end of the ferrule body, wherein the tip of the composite tube is pressed onto the coupling end of the fitting body by the coupling of the composite tube and the first threaded portion of the fitting body, When the fitting body and the ferrule body are coupled by the second threaded portion of the body and the third threaded portion of the ferrule body, the first inclined surface of the fitting body and the second inclined surface of the ferrule body hermetically seal each other Wherein the paralle body deforming portion corresponding to the distal end portion of the second inclined surface of the paralle body is deformed by the first inclined surface of the fitting body to pierce the plastic layer of the composite tube, Between the second inclined surface and between the plastic layer and the distal end of the ferrule body To provide a composite fitting structure that is disposed between me.

The covering may include an outer portion disposed on the outer side of the far body when the distal end is mounted on the distal end of the far body, and a medial portion disposed on the inner side of the far body.

The covering may include a connecting portion connecting the outer side portion and the inner side portion.

The medial portion may include a thicker round portion than other portions of the medial portion.

The connecting portion may include a thinner breaking portion than other portions of the connecting portion.

A stepped portion may be formed on the distal end of the ferrule body on which the covering is mounted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a fully assembled fitting structure according to an embodiment of the present invention,
FIG. 2 is a cross-sectional view of the fitting structure according to an embodiment of the present invention,
FIG. 3 is a cross-sectional view of a ferrule according to another embodiment of the present invention,
FIG. 4 is a cross-sectional view of a fitting structure according to another embodiment of the present invention,
5 is a cross-sectional view of a covering and a ferrule body end according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

1 is a cross-sectional view of an embodiment according to the present invention before coupling is completed.

The basic structure consists of two main parts: a fitting body (1), a ferrule body (2), and a composite pipe (3) having more than two layers.

The fitting body 1 and the ferrule body 2 are made of a common metal material such as stainless steel or brass and the composite pipe 3 is composed of a plastic layer 31 and a metal layer 32 forming the outer shell.

As the plastic layer 31, a polymer polymer such as polyethylene or polyimide is used. The metal layer 32 is determined depending on the use place of the composite pipe, and in general, inexpensive aluminum is most used.

Although not shown, the composite pipe 3 may have a triple structure consisting of a plastic-metal-plastic layer.

The fitting body 1 has a first screw portion 11 for engaging with a plastic layer 31 forming an outer surface of the composite pipe 3 on the inner surface of the fitting body 1. A ferrule body 2 is inserted into an inlet portion, And the second threaded portion 12 is engaged with the third threaded portion 21 provided on the outer surface of the paralle body 2.

A fitting body inclined surface 13 having a predetermined angle is formed between the first screw portion 11 and the second screw portion 12 of the fitting body 1. A ferrule body sloping surface 22 is formed at one end of the ferrule body 2. [ So that they are tightly sealed by metal-to-metal contact of the respective inclined surfaces 13, 22 when they are fully engaged.

The coupling process with the composite pipe 3 is as follows.

The plastic layer 31 of the composite pipe 3 is engaged with the first threaded portion 11 of the fitting body 1 by the rotation torque of the cooperator and proceeds to the left side in the direction of the arrow in FIG.

When the distal end of the composite tube 3 reaches the coupling end portion 14 of the fitting body 1, the coupling end portion 14 and the plastic layer 31 form an airtight structure.

Wherein the radius of the coupling end 14 is adjusted such that it does not come into contact with the metal layer 32 of the composite pipe 3.

This is to prevent galvanic corrosion due to direct contact because the metal material of the fitting body 1 and the metal material of the composite tube 3 and the metal layer 32 are generally different.

When the coupling between the composite pipe 3 and the fitting body 1 is completed, a torque is applied to the ferrule body 2 to couple the fitting body 1 and the ferrule body 2 together.

Fig. 2 is a view showing a cross section after the coupling is made.

As the second screw portion 12 of the fitting body 1 is engaged with the third screw portion 21 of the ferrule body 2, the ferrule body deformation portion 23, which is the distal end of the ferrule body 2, (13) and deforms at a certain angle as it receives a force, and is bent into the plastic layer (31) of the composite pipe (3) and tightened.

This action is similar to conventional parallel type fittings and is obvious to those skilled in the art. However, since the strength of the ferrous body 2 made of a metal is much greater than the strength of the plastic layer 31, the ferrule-body-deformed portion 23 is formed into a large portion of the plastic layer 31.

The coupling between the first screw portion 11 of the fitting body 1 and the plastic layer 31 of the composite pipe 3 complements the disadvantages of the conventional simple paralle fitting. Conventionally, the paralle is generally divided into a front paralle and a rear paralle The distal end of the front paralle is deformed by the compression of the rear paralle, and the paralle is acted on the pipe.

When such a structure is applied to the composite pipe in the same manner, a load load is concentrated on the coupling portion between the ferrule body deformation portion 23 of the ferrule body 2 and the plastic layer 31, and in the case of high temperature and high pressure, The damage to the outer shell is broken or peeled off.

Therefore, it is impossible to apply the conventional technique to the composite pipe as it is.

The first threaded portion 11 of the fitting body 1 disperses the load applied to the coupling portion, thereby helping the outer sheathing plastic layer 31 to withstand the high temperature and high pressure.

Particularly, when the airtight means by the engagement end portion 14 of the fitting body 1 is operated, the effect of expanding the pipe by the internal pressure of the pipe and making the plastic layer 31 more closely contact with the first screw portion 11 Thereby bringing about a synergistic synergistic effect.

The airtight portion formed by the engagement of the coupling end portion 14 of the fitting body 1 with the distal end portion of the composite pipe 3 and the coupling between the paralle body modification portion 23 of the ferrule body 2 and the plastic layer 31 of the composite pipe 3 The confidentiality of the work is complementary and cooperates with each other as follows.

When the ferrule body 2 moves to the right in the figure due to external disturbance such as external shock or vibration or other temperature change, the fitting of the ferrule body deformation portion 23 is loosened, The sealing end between the distal end of the composite pipe 3 and the fitting end 14 of the fitting body 1 is strengthened and the movement of the coupling end 14 toward the left side is increased to increase the risk of leakage At the same time, the paralle body 2 also moves to the left side, so that the coupling between the paralle body deforming portion 23 and the plastic layer 31 is strengthened to compensate for the risk of leakage.

This complementary behavior creates an effective airtight structure beyond merely having a dual airtight structure.

2, the distal end portion of the composite pipe 3 and the coupling end portion 14 of the fitting body 1 are not directly in contact with each other but are not coupled to each other, and a washer-shaped metal layer contact preventing means 16 have.

Since galvanic corrosion due to direct contact may occur when a contact of dissimilar metals occurs as in the case where the metal layer 32 of the composite pipe 3 is aluminum and the fitting body 1 is made of brass, The distal end 14 may be designed to have a radius such that only the plastic layer 31 located at the outermost edge of the composite tube 3 is contacted and compressed, or a metal layer 32 (see FIG. 2) is formed between the distal end 14 of the composite tube 3 and the distal end of the composite tube 3 The metal layer contact prevention means 16 is provided.

The metal layer contact preventing means 16 not only prevents galvanic corrosion but also has an effect of enhancing airtightness.

That is, when polyethylene, which is mainly used as a shell of a pipe, is directly brought into contact with the fitting body 1, there is a problem in primary airtightness due to thermal property, elastic modulus and thermal expansion rate under an environment of high temperature and temperature deviation. It is preferable to fabricate the metal layer contact preventing means 16 so as to have a better airtightness by using a Teflon material or silicone rubber having an excellent thermal characteristic and an elastic modulus as compared with polyethylene. In the case of using silicone rubber, it is preferable to use a silicone rubber having a high hardness, for example, 60 to 80 (durometer A) so as not to cause severe deformation by being pressed by the composite pipe 3 and the fitting body 1 .

It is important to select an appropriate thickness and area so that the metal layer contact preventive means 16 does not collapse or deform because the metal layer contact preventing means 16 is pressed against the rotational torque of the composite pipe 3.

The paralle body sloping surface 22 immediately above the paralle body deforming portion 23 which is the distal end of the paralle body 2 digging into the outer surface of the composite pipe 3 is airtight by metal to metal contact with the sloped surface 13 of the fitting body .

The function of the paralle body deforming part 23 is similar to that of the known paralle but in the present invention, the deformation displacement of the paralle body deforming part 23 is considerably large and the insertion angle is different from the conventional one.

The insertion length is 1.2 to 2.5 mm in the horizontal direction and 0.3 to 1 mm in the vertical direction, and the angle is preferably set to 25 to 45 degrees.

In addition, in the case of a single ferrule, the known technology forms an appropriate groove or a wedge-shaped deformation portion in various portions of the paralle to assist the airtight action by the contact of the metal, but the present invention may use an additional inclined surface.

It is of course possible to form an appropriate groove on the inside and outside of the paralle body 2 so that the paralle body deforming portion 23 is appropriately deformed to provide a hermetic action.

The airtightness by the direct contact of the slopes 13 and 22 becomes important for the surface roughness of the fitting body slope 13, and if the surface roughness is insufficient, a minute leak may occur.

Also, since the contact of the upper right portion of the paralle body deforming portion 23 is not perfect due to the machining error of the paralle body 2, or the pipe is not uniform, the paralle body deforming portion 23 is partially unevenly received By the deformation, minute leaks may occur in the metal-to-metal hermetic seal at the upper end.

In addition, there is a possibility that the forward amount of the ferrule body 2 changes depending on the force exerted by the assembler, so that uniform performance can not be exhibited.

3 is a cross-sectional view of a paralle body 2 according to another embodiment of the present invention.

The cover ring 4 is inserted into the distal end portion of the paralle body 2 on which the paralle body slope 22 and the paralle body deforming portion 23 are formed. A step 25 may be formed on the inside of the front end of the ferrule body 2 into which the cover ring 4 is inserted. The step portion 25 can be formed by further cutting the inner portion of the tip end portion.

The covering 4 may be made of NBR (Nitrile Butadiene Rubber) rubber, silicone, or the like.

The covering 4 includes an outer portion 41 disposed on the outside of the paralle body 2 when inserted into the paralle body slope 22, an inner portion 42 disposed on the inner side of the paralle body 3, And a connecting portion 44 for connecting the inner side portion 42 with each other. Between the outer side portion 41 and the inner side portion 42 is formed an insertion groove 43 into which at least one portion of the distal end portion of the paralle body 2, for example, the paralle body deforming portion 23, is inserted.

The connecting portion 44 is formed to have a thickness smaller than the thickness of the outer side portion 41 and the inner side portion 42. The connecting portion 44 can be easily cut by the edge of the distal end of the ferrule body 2 when the ferrule body 2 is coupled to the fitting body 1 as described later.

4 is a cross-sectional view of a state in which the ferrule body 2 equipped with the cover ring 4 is engaged with the fitting body 1. Fig.

As described above, the paralle body deforming portion 23 is pushed by the fitting body inclined surface 13 to dig the plastic layer 31 of the composite pipe 3.

The connecting portion 44 connecting the outer side portion 41 and the inner side portion 42 of the covering 4 is pushed by the stepped portion 25 and the outer side portion 41 and the inner side portion 42 are separated from each other.

The separated outer side portion 41 is disposed between the fitting body slope surface 13 and the ferrule body slope surface 22 and functions as a sealing member such as an O-ring, so that the airtightness between these slope surfaces 13, . In particular, it is possible to fundamentally eliminate the risk of gas leakage that may occur when the surface roughness of the inclined surfaces 13, 22 is poor due to machining errors.

The separated inner side portion 42 is disposed between the plastic layer 31 and the step portion 25 and functions as a sealing member such as an O-ring, so that the plastic layer 31 and the ferrule body deformation portion 23 are formed, Thereby enhancing the airtightness. The sealing member having such a large elastic modulus plays an important function for preventing leakage which may occur during repetitive thermal load due to a difference in thermal expansion coefficient between the plastic layer 31 and the stepped portion 25 made of a metal material do.

5 is a cross-sectional view of the distal end portion of the paralle body 2 in a state in which the cover ring 4a is mounted.

The inner side portion 42 of the covering 4a has a round portion 421 having the greatest thickness t1 in a portion close to the connecting portion 44. [ The round portion 421 is formed in such a manner that when the ferrule body 2 is coupled to the fitting body 1 and the inner side portion 42 is separated from the connecting portion 44, It is possible to maintain the shape close to the O-ring, thereby more effectively maintaining the airtightness therebetween.

The connecting portion 44 of the covering 4a has a fracture preventing portion 422 having the smallest thickness t2 at a portion adjacent to the inner side portion 42. [ The rupturing portion 422 can be easily cut by the edge of the distal end of the ferrule body 2 when the ferrule body 2 is engaged with the fitting body 1. [

The outer portion 41 may have a thickness t3 that is greater than thickness t2 and less than thickness t1.

As described above, embodiments of a fitting structure for use in a high-pressure composite pipe and a reliable composite pipe fitting structure that can be used in an environment in which a temperature change is abruptly accompanied are provided through the drawings.

In the above description, the right side portion of the fitting structure shown in the drawings has been mainly described. In the left side portion, which is not shown, the same symmetrical structure as the right side portion is integrally formed for connection of pipes, A screw thread for connection to an air conditioner or the like may be formed on the inner surface or the outer surface of the fitting body, which is obvious to a person skilled in the art.

1: fitting body 11: first threaded portion
12: second screw portion 13: fitting body inclined surface
14: coupling end 16: metal layer contact prevention means
2: ferrule body 21: third thread portion
22: Paralle body slope 23: Paralle body deformation section
25:
3: Composite tube 31: Plastic layer
32: metal layer
4: Covering 41: Inner side
42: outer side portion 43: insertion groove
44: connection part 421: round part
422:

Claims (6)

A composite pipe fitting structure used for hermetically sealing a multi-layered composite pipe having a metal layer inside and an outer plastic layer,
A hollow fitting body comprising: a first threaded portion formed to be engaged with the plastic layer at a tip end portion of the composite pipe inserted into the fitting body; a first threaded portion formed at an inlet side of the fitting body into which the distal end portion of the composite pipe is inserted, The fitting body having a first thread portion, a second thread portion, a first inclined face formed between the first threaded portion and the second threaded portion, and a coupled end portion disposed on the opposite side of the first inclined face with the first threaded portion interposed therebetween;
Wherein the ferrule has a hollow parallelepiped body into which the distal end of the composite tube is inserted, wherein a distal end of the ferrule has a second inclined surface formed corresponding to the first inclined surface and a third threaded portion adapted to be engaged with the second screwed portion, Body;
Contact prevention means disposed between the engagement distal end of the fitting body and the distal end of the composite tube; And
And a cover ring mounted on the distal end of the paralle body,
The tip end portion of the composite pipe is pressed onto the joint end portion of the fitting body by the engagement of the composite pipe and the first screw portion of the fitting body,
When the fitting body and the ferrule body are coupled by the second threaded portion of the fitting body and the third threaded portion of the ferrule body, the first inclined surface of the fitting body and the second inclined surface of the ferrule body are airtight The ferrule body deforming portion corresponding to the distal end portion of the second inclined surface of the ferrule body is deformed by the first inclined surface of the fitting body to dig the plastic layer of the composite tube,
Wherein the covering is disposed between at least one of the first inclined surface and the second inclined surface and between the plastic layer and the distal end of the ferrule body. The method according to claim 1,
Wherein the covering comprises an outer portion disposed on the outer side of the ferrule body and a medial portion disposed on the inner side of the ferrule body when mounted on the distal end of the ferrule body. The method of claim 2,
Wherein the covering includes a connection portion connecting the outer side portion and the inner side portion. The method of claim 3,
Wherein the medial portion includes a thicker round portion than other portions of the medial portion. The method of claim 3,
Wherein the connecting portion comprises a thinner rupture portion than other portions of the connecting portion. The method according to claim 1,
And a stepped portion is formed on the distal end portion of the ferrule body to which the covering is mounted.
KR1020150160602A 2015-11-16 2015-11-16 Fitting mechanism for use with multilayer composite pipe KR101760064B1 (en)

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Application Number Priority Date Filing Date Title
KR1020150160602A KR101760064B1 (en) 2015-11-16 2015-11-16 Fitting mechanism for use with multilayer composite pipe

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KR102102661B1 (en) * 2018-08-13 2020-04-22 주식회사 로도에이치 Fitting mechanism for metal pipe
AU2020299928A1 (en) * 2019-07-03 2022-02-17 Sugjae KANG Pipe sealing device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008082373A (en) 2006-09-26 2008-04-10 Daikin Ind Ltd Bite type pipe joint, freezing equipment, and water heater

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008082373A (en) 2006-09-26 2008-04-10 Daikin Ind Ltd Bite type pipe joint, freezing equipment, and water heater

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