KR102155660B1 - Connecting Tube for Pipe - Google Patents

Abstract

The present invention relates to a connection pipe for pipe connection. An object of the present invention is to provide the connection pipe for pipe connection in which presence or absence of crimping can be easily identified by appearance, along with application of an O-ring made of a material which can be used without any change in physical properties even under a high temperature or chemical action of a fluid. For a purpose of connecting pipes which are introduced and inserted into both sides, a first crimping unit and a second crimping unit are continuously formed at each end of both sides by using a crimping jaw tool. The inside of the first crimping unit is sealed through a metal ring, while the second crimping unit is sealed through a sealing member. An identification band for visually confirming presence or absence of crimping is wrapped around at least one of the first and second crimping units.

Description

Connecting Tube for Pipe}

The present invention relates to a connection pipe for a pipe joint, and more particularly, as a connection pipe that connects pipes used for fluid movement, which can be maintained without change in physical properties even in contact with the fluid while blocking loss with fluid. It relates to a connection pipe for pipe joints.

Pipes are generally used for moving each type of fluid, and since they have an appropriate length individually, joint pipes for connection purposes that enable these pipes to be connected to each other are also installed at construction sites.

In particular, pipes for the purpose of moving a fluid in a high temperature state or a fluid in a compound state are designed to prevent leakage of fluid during the process of being connected through a joint pipe. As a result of securing airtightness by filling a sealing member such as an O-ring. , This prevents the fluid from being lost to the connection part of the pipes.

However, as a sealing member used in a joint pipe used for connection of pipes, for example, most O-rings are made of rubber material, so they have frequent contact with the O-rings in the process of moving a fluid made of compound through the pipes. Accordingly, since the rubber-made O-ring loses its original properties and properties through a chemical action, the airtightness of the O-ring decreases over a long period of time, causing a practical problem that cannot prevent external loss of fluid.

Generally known rubber O-rings are applied and used in all applications, but when applied to a joint of a pipe used for high temperature fluid, there is a problem that the rubber O-rings must be replaced frequently due to deterioration.

For these reasons, even if a joint connected to a pipe used for fluid movement is crimped, leakage occurs, so it is practically impossible to check the leak for a joint to which a rubber O-ring is applied.

In addition, in the process of connecting the joint to the pipe used for fluid movement, the joint is crimped.If the crimping work of many joints increases, try directly touching which joint is compressed and which joint is not compressed. The process to be checked is essential.

In this way, in the case of crimping a large number of joints, the time for joint connection work is excessively consumed, as the operator must check and check the crimping conditions of many joints one by one to check whether the joint is crimped. Along with the inefficiency of sex, excessive expenditure of labor costs is caused.

Patent Document 001: Registered Patent No. 10-0816627

In order to solve the above-described problems, the present invention provides an O-ring of a material that can be used without any change in physical properties even at a high temperature or chemical action of a fluid when connecting pipes used for fluid movement of a high temperature fluid or chemical component. Its purpose is to provide a connection pipe for piping joints that can be easily identified from the exterior.

The present invention for achieving the above-described objects is a first crimp portion and a second crimp portion successively formed at each end of both sides as a connection of pipes that are inserted into both sides using a crimp tool. 1 There is a feature of a connection pipe for a pipe joint, which is sealed through a metal ring inside the crimping part, while sealing through a sealing member inside the second crimping part.

The sealing member provided by being inserted into the inside of the second compression unit has a characteristic of a connection pipe for a pipe joint that is an O-ring made of Teflon.

The Teflon has one characteristic in a connecting pipe for pipe joints extracted from fluorite (CaF2 螢石, Fluorite).

The Teflon is characterized in that it is a pipe joint connector consisting of a powder particle size having a range of 15㎛ to 35㎛.

The Teflon is characterized in that it is a connection pipe for a pipe joint that is pressurized and compressed at a pressure in the range of 320 to 370 Kg based on a cross-sectional area of Teflon.

On the other hand, in the present invention, for the purpose of connecting pipes that are inserted into both sides, a first compression unit and a second compression unit are continuously formed at both ends using a compression tank tool, and the inside of the first compression unit is A pipe joint in which an identification band is bent on at least one of the first and second compression portions, while sealing is performed through a ring, while sealing is performed through a sealing member inside the second compression unit. There are other work features on the dragon connector.

The identification band is composed of a material of a film, and fragments decomposed through compression of the identification band, and are located between the fragments as film pieces of a faceted structure constituting the identification band. As film spaces of a separation space structure to separate, gaps for separating the fragments through compression of the identification band, and a strand line of a film yarn connecting the fragments to each other, short-circuited through compression of the identification band, and connection of the fragments There is another feature of the connection pipe for a pipe joint further comprising a separate connection line.

The sealing member provided by being inserted into the second crimping portion has another characteristic of a connection pipe for a pipe joint that is an O-ring made of Teflon.

The Teflon has another feature in the connecting pipe for pipe joints extracted from fluorite (CaF2 螢石, Fluorite).

The Teflon has another feature in the connecting pipe for pipe joints composed of a powder particle size in the range of 15㎛ to 35㎛.

The Teflon has a different feature of the connection pipe for pipe joints pressurized and compressed at a pressure in the range of 320 to 370 Kg based on the cross-sectional area of Teflon.

According to the present invention as described above, as a connecting pipe connected to pipes used for fluid movement, there is an effect that it can be continuously used without changing physical properties even in contact with a fluid.

In addition, in the process of crimping the connection pipe, it is possible to easily check the presence or absence of crimping of the connection pipe with the naked eye from a distance, thereby saving time for the crimping operation of the connection pipe and reducing labor costs according to the efficiency of the crimping operation.

1 is a view showing in three dimensions the utilization state of the connection pipe for a pipe joint according to the first embodiment of the present invention;
FIG. 2 is a perspective view of the connecting pipe for a pipe joint shown in FIG. 1 and showing a cutting direction together;
3 is a cross-sectional view of the connection pipe showing the sealing state of the sealing member as an internal structure of the connection pipe cut in the direction of the cut line shown in FIG. 2;
Figure 4 is a view showing the utilization state of the second embodiment of the pipe joint connection pipe according to the present invention in three dimensions;
Figure 5 is a perspective view of the connection pipe for the pipe joint shown in Figure 4,
FIG. 6 is a three-dimensional view conceptually showing an identification band bending a portion of a crimping portion of the connection pipe for a pipe joint shown in FIG. 5;
FIG. 7 is a diagram conceptually showing fragments caused by gripping of an identification band in a process of compressing a crimp portion of the connecting pipe for a pipe joint shown in FIG. 5;
FIG. 8 is a cutaway view conceptually showing a structure in a state in which the connection pipe for a pipe joint shown in FIG. 4 is connected to a pipe and compressed, and a structure in a bending state of an identification band bent toward a pressing portion.

The present invention should be interpreted in a manner that includes the scope of the rights to the technical idea through various modified embodiments, only these embodiments make the posting of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have it, and the invention is only defined by the scope of the claims.

Moreover, the drawings attached to the present invention are attached as a way to help the understanding of the description of the present invention to the last, and the technical idea of the present invention should not be interpreted as being limited by the attached drawings.

The connection pipe (C) for a pipe joint according to the present invention is used to be connected between a pipe (P) for fluid movement and a pipe (P') as shown in FIG. 1, and the pipe (P) (P' ) Are for the transfer of high temperature fluids or fluids with chemical components.

The connecting pipe (C) has a first compression portion (C1) (C1') of a double convex ring structure at both end portions and a second compression portion (C2) (C2') formed in connection with the first compression portion. It can be composed of.

That is, of the both ends of the connection pipe (C), for example, at one end, the first crimping part C1 and the second crimping part C2 may be connected to each other in a convex double ring structure. For example, the other end The first compression portion C1' and the second compression portion C2' may be connected to each other in a convex double ring structure.

Of course, the first crimping portion (C1) (C1') and the second crimping portion (C2) (C2') are compressed using a crimping tank tool, so that the connection pipe (C) is It is possible to prevent the loss of fluid moving to the connected pipes (P) (P').

In particular, the inside of the first compression portion (C1) (C1') may be configured in a structure in which a metal ring (R) is inserted as a sealing member as in FIG. 3 with reference to FIG. 2, and the second compression The inside of the part C2' may be configured in a structure in which, for example, an O-ring 20 is inserted as another sealing member.

The pipe (P) in a state in which pipes (P) (P') are inserted at both ends of the connection pipe (C) having a double ring structure sealing member of the metal ring (R) and O-ring (20). It is possible to double seal and prevent the loss of fluid that moves along the internal path of (P').

That is, the metal rings R and O-rings 20 provided therein, respectively, during the process of compressing the first and second press portions C1 and C1′ and C2 and C2′. As it is compressed, it has a sealing structure capable of double blocking the loss of fluid as shown in FIG. 3.

In particular, the O-ring 20 has a wide distribution during the compression process of the second compression portion (C2) (C2'), so that the connection between the pipes (P) (P') can be sealed. Since the distribution area is significantly larger than that of the metal ring R, leakage of fluid can be more effectively blocked.

The O-ring 20 is made of a Teflon material as its material. These Teflon materials are able to maintain their original properties without changing their physical properties even though they are constantly in contact with the high-temperature fluid or chemical fluid that moves inside the pipes (P) (P'). It can have an effect.

Therefore, this O-ring 20 can solve the problem of frequent replacement due to the use of the existing rubber O-ring, due to the characteristic that there is no change in physical properties even in frequent contact with the fluid, and can prevent the loss of fluid for a long period of time. Semi-permanent use is also possible.

As such, since the O-ring 20 is made of a Teflon material, it can be used for a long time without any change in physical properties due to corrosion resistance and heat resistance even when applied to a pipe connection of a fluid, and excellent fluidity of the fluid can be guaranteed.

The raw material of the O-ring 20 is a so-called Teflon material in which the fluorine resin is chemically bonded to a non-flammable fluororesin belonging to the organic polymer series in the state of collecting fluorine resin from the raw stone of fluorite (CaF2 fluorite). What can be obtained.

This Teflon is called polytetrafluoroethylene (PTFE), and is a nonvolatile acid fluorine resin that reacts fluorspar (CaF2 螢石, Fluorite) with sulfuric acid.For example, its chemical reaction formula is CaF2 + H2SO4 = CaSO4 + 2HF may be formed, and at this time, impurities such as SiO2 may be generated. Therefore, it can be obtained as a non-flammable fluorine resin (PTFE) compound through a purification method of distilling after reacting with KMnO4 to make inert acid in order to remove such SiO2 impurities.

Of course, such Teflon can be made of tetrafluoroethylene (TFE) and hydrochloric acid (HCl) into a polymer-like non-flammable fluororesin, such as a polymer at a specific pressure and temperature, which is a white plastic-like material. The Teflon material is insoluble in almost any solvent, does not burn, and does not rot or decompose.

This Teflon can be further pulverized to a predetermined powder particle size using a pulverizer, and then obtained through a mold, compression molding, and heat treatment, and the powder particle is preferably a powder particle size having a range of 15 μm to 35 μm. If the powder particles of the Teflon material are less than 15 μm, the cohesive force between the powder particles decreases during the compression molding process, and cracking may occur during the heat treatment process, while the powder particles of the Teflon material exceed 35 μm. If it is exceeded, the coagulation force between the powder particles becomes too high, which is not suitable for the use of a sealing member having a predetermined elasticity (flexibility).

Therefore, the Teflon material must have a powder particle size in the range of 15 μm to 35 μm, so that it is suitable for use as a sealing member that maintains higher airtightness at the connection pipe (C) connected to pipes for high temperature fluids or chemical fluids. will be.

Furthermore, it is preferable to compress the Teflon having the powder particle size by pressing the Teflon at a predetermined pressure based on the cross-sectional area, for example, in the range of 320 to 370 Kg in the compression molding process.

When the pressure is less than 320 Kg, the aggregated density between the Teflon powder particles decreases, causing a phenomenon in which fluid permeates the sealing member mass-produced as a product through twisting, resulting in a problem of lowering the material strength of the sealing member. On the other hand, when the pressure exceeds 370 Kg, the pressure is too high, which may cause damage to the mold part, and above all, the hardness of Teflon itself increases, maintaining airtightness at the connecting pipe part of the pipes, and predetermined elasticity (flexibility). Not suitable for the use of sealing members having

In the heat treatment of Teflon, a heat treatment method in which the temperature is gradually increased over 24 hours to a temperature ranging from 320°C to 380°C may be used. At this time, the temperature is preferably raised to 2.5 ℃ per hour, the error range may be set to ±0.5 ℃.

The reason that Teflon is heat-treated in a heat treatment machine in a temperature-raising method ranging from 320°C to 380°C for 24 hours is to completely remove the fluorine gas contained in Teflon during the heat treatment process and to prevent combustion.

In other words, if the temperature in the heat treatment unit cannot be raised from 320℃ to 380℃ to 2.5℃ per hour, and the temperature rapidly rises to a temperature exceeding 2.5℃ or exceeds 380℃ for more than one hour, Teflon This burning phenomenon may cause a problem.

Therefore, in the process of heat treatment of Teflon through a heat treatment machine, it must be heat-treated by a heating method ranging from 320°C to 380°C for 24 hours, and it must be heat-treated by a regular heating method at 2.5°C per hour. As an impure gas, fluorine gas can also be completely removed.

The sealing member made of Teflon material of the O-ring 20 exhibits excellent heat resistance, chemical resistance, and high durability as the unique physical properties of fluorine-based polymers and can semi-permanently prevent fluid loss. B. It may be suitable to be used for securing airtightness in the connection pipe (C) for the joint of pipes used for the movement of compound fluid.

The sealing member made of such a Teflon material can be compared with the properties of the hydrocarbon-based PE, which can be referred to in Table 1 below.

Property Sealing member (PTFE) PE Chemical structure -(CF ₂ CF ₂ ) _n- -(CH ₂ CH ₂ ) _n- Melting temperature (℃) 342(first), 327(second) 105-140 Refractive index 135 151 Chain branching propensity No Yes Melt viscosity (Poise) 10 ¹⁰ -10 ¹² 10 ⁴ -6×10 ⁴ Activation energy of thermal degradation (KJ/mol) 339 264 Surface energy (mN/m) 18 33 Density 2.2-2.3 0.92-1 Dynamic coefficient of friction 0.04 0.33 Dielectric constant (1kHz) 2.0 2.3 Resistance to solvents and chemicals No known solvent Hot hydrocarbons

As can be seen from Table 1, the sealing member (PTFE) is particularly airtightly worn on the connection pipe for the connection of pipes that move high temperature fluids or chemical fluids to prevent loss of fluid that may leak through the clearance gap between the pipe and the connection pipe. It is suitable for the purpose of preventing, and also exhibits excellent heat resistance, chemical resistance, and high durability through contact with these fluids, so that it can be used semi-permanently as a sealing member for preventing loss.

On the other hand, in the process of connecting the pipes (P) (P) through the connection pipe (C), the pipes connected to both sides of the connection pipe (C) by crimping the molded ends of both sides of the fitting using the crimping tank of the crimping tool The sealing of the elements can be improved, and in particular, the first crimp portion may be formed with grooves of a +-shaped structure in the inside of the connection pipe (C) into which the metal ring (R) and the O-ring (20) are inserted. In the process of compressing (C1) (C1') and the second pressing portion (C2) (C2'), the metal ring (R) and part of the O-ring (20) are filled into a groove of a +-shaped structure. Not only can the metal ring (R) and the O-ring (20) be partially filled in to prevent the loss of fluid, but also prevent the connection pipe (C) from turning away by being caught in the groove of the +-shaped structure. have. Of course, the +-shaped groove is not shown in the drawing.

Along with the geometrical deformation of the metal ring (R) and the O-ring (20) due to the compression of the first compression portion (C1) (C1') and the second compression portion (C2) (C2') The deformation filled in the grooves of the structure creates a mechanical joint structure that is resistant to slipping and rotation of the connecting pipe (C) connected to the pipes (P) (P'), which is more suitable for connecting pipes than conventional joint pipes.

Of course, the connection pipe (C) is flexible enough to withstand stress caused by initial installation and stress generated under normal operating conditions such as vibration and thermal expansion, and when applied to a pipe used for fluid movement, its diameter is A range of 12 to 54 mm is preferred, suitable for temperature ranges between -20 and +120 ° C, and may be suitable for pressures up to 16 bar. It can be used to connect drinking water, heating, cooling, steam, fire fighting, compressed air (oil free) and inert gas pipes for a variety of purposes.

On the other hand, the connection pipe (C) is a first compression portion (C1) (C1'), a second compression portion (C2) (C2') constituting the connection pipe of the first embodiment, a metal ring (R), and The configuration including the O-ring 20 may further include a configuration in which the identification band IB is bent around the second pressing portions C2 and C2 ′ as shown in FIGS. 4 and 5. .

The identification band (IB) is bent around the second compression portion (C2) (C2'), which is the outer surface of the connector (C), and is made of a thin color film structure having a prominent, for example, red color. I can.

The identification band (IB) may be composed of fragments (SP), a gap (GAP) and a connection line (CL) as shown in Figs. 6 to 8, the fragments (SP) are the identification band (IP) These are films of a conical structure, and the gap (GAP) is a film of a separation space that is located between the fragments (SP) to effectively separate the fragments (SP), and the connection The line CL is a film of a shorting line that separates the fragments SP by shorting each other.

Therefore, the identification strip (IB) is a configuration that does not interfere with the pipe connection work or the crimping process of the connection pipe (C), and the first crimping part (C1) (C1') and the second crimping part (C2) ( C2') is torn in a form that is easily gripped during the compression process and can be separated from the connection pipe (C).

In this way, when the identification strip (IB) is separated from the connection pipe (C), the first crimping portion (C1) (C1') and the second crimping portion (C2) (C2') of the connection pipe (C) The compression of can be quickly identified as already performed.

Therefore, when the identification strip (IB) is separated from the connection pipe (C), the workers visually check whether the connection pipes (C) are crimped from a distance from the installation site of the connection pipes (C) of the pipes (P) (P'). As it is possible to quickly grasp it, it is possible to reduce the inconvenience of checking and inspecting the overlapping compression of the connection pipe (C) or the compression of the connection pipe (C) one by one.

That is, the identification strip (IP) provided in the crimping portion of the connector (C) is torn and separated into debris (SP) in the pressing process, so that the workers go closer to the connector (C) to confirm the compression. It is possible to check whether the connection pipe (C) is compressed from a distance without need.

The color of the identification band IB is a strong color series that can stand out to the naked eye, and may be applied as a luminous color series such as red, orange, blue, or green.

In addition, the identification band (IB) is not separated from the connection pipe (C) as another embodiment, but is provided as a banding film in which the color of the identification band (IB) changes during the pressing process of the connection pipe (C). May be. The structure and shape of the bending film are not shown in detail, but since it can be grasped through the description to be described later, it should not be interpreted as a reason for inadequate description.

The banding film may inform workers of the presence or absence of compression of the connector C by color change according to the compression of the connector C.

The banding film includes an outer film corresponding to an outer portion, a solid material bonded to the inner side of the outer film, a filling film filled in the outer film, and pressure sensitive paper inserted into the filling film.壓紙) can be made in a configuration including.

The outer film and the filling film may be made of a transparent material, and the solid material is preferably a solid material coated with iron chloride powder on its surface. The solid material is preferably formed in a conical structure of a plastic material, and the pressure reduction The paper is preferably a reduced pressure paper impregnated with a solution of potassium ferrocin anhydride, a solution of carbonic acid, or a solution of potassium thicyanide.

Therefore, in the process of compressing the connection pipe (C), the banding film is compressed. In this process, the solid material provided inside the outer film comes into contact with the pressure-sensitive paper inside the filling film in the process of pressing the filling film. In this process, the iron chloride powder applied on the surface of the solid material reacts with potassium ferrocin anhydride, tansinic acid, or potassium thiocyanide contained in the pressure-sensitive paper to change the color of the banding film.

That is, the banding film becomes blue due to the reaction of iron chloride and potassium ferrocyanide, and becomes black due to the reaction of iron chloride and carbonic acid, and red due to the reaction of iron chloride and potassium thiocyanide.

Therefore, with the change in the color of the bending film, workers can immediately know that the pressurization of the joint pipe connecting the pipe and the pipe has been completed.

Of course, the black, red, and blue color of the banding film may be applied differently for each area of the pipe. For example, when applied to a plant facility area with a large scale, the joint of a pipe in any area of the plant facility depending on the color of the banding film. It is possible to quickly and accurately determine the presence or absence of crimping of the pipe.

On the other hand, the metal ring (R) may be composed of austenitic stainless steel Cr-Ni-Mo steel in the process of pressing, that is, pressing (pressfittings), which has an increased resistance to corrosion that may be caused through contact with a fluid. It is for sake.

The metal ring (R) made of such austenitic stainless steel Cr-Ni-Mo steel has strong resistance to bimetal corrosion, and is also resistant to corrosion in contact with nonferrous metals (bronze, copper, and brass) regardless of the flow direction of the fluid. .

However, since the metal ring R has a potential for bimetal corrosion when it comes into direct contact with carbon steel, it is a bar that is formed by further installing a non-ferrous spacer between two metals of the metal ring and carbon steel. It can prevent corrosion that can be caused.

On the other hand, the connection pipe (C) is also required to be resistant to corrosion from the outside, which can be caused in very specific situations, such as prolonged contact with high concentrations of chloride or its compounds (e.g., galvanic conditions or covered swimming pools). For resistance to external corrosion, a waterproof adhesive may be applied to the outer surface of the connection pipe (C).

Piping(P)(P')
Connector (C) first crimp (C1) (C1')
The second pressing part (C2) (C2') metal ring (R)
O-ring(20)
Identification Band (IB) Fragment (SP)
Gap connection line (CL)

Claims (11)

delete For the purpose of connecting pipes that are inserted into both sides, the first and second crimping parts are continuously formed at both ends using a crimping tank tool, and the inside of the first crimping part is sealed through a metal ring. On the other hand, the sealing is made through a sealing member inside the second compression unit, and the sealing member inserted into the second compression unit is an O-ring made of Teflon,
The identification band banded on at least one of the first compression unit and the second compression unit is composed of a banding film that identifies the presence or absence of compression only by color change without separation during the compression process,
The banding film,
An outer film bent on at least one of the first compression unit and the second compression unit;
A solid material bonded to the inside of the outer film;
A filling film filled in the outer film; And
A pressure-sensitive paper inserted into the filling film;
A connection pipe for a pipe joint, characterized in that consisting of a configuration comprising a. The method of claim 2,
The Teflon is a pipe joint connector, characterized in that extracted from fluorite (CaF2 螢石, Fluorite). The method of claim 3,
The Teflon is a connector for a pipe joint, characterized in that consisting of a powder particle size having a range of 15㎛ to 35㎛. delete delete delete delete delete delete delete

Images