KR101085123B1 - Non-welding pipe joint using flare processing - Google Patents

Abstract

PURPOSE: A non-welded pipe joint using flaring is provided to improve the airtightness of a pipe joint by inserting a gasket, which is expanded in an inverted V shape, between pipes. CONSTITUTION: A non-welded pipe joint using flaring comprises pipes(110), a gasket(120), and a ring joint(133,135). The pipes have an expanded part(111) which is formed by expanding each end of a pipe at the angle of 90° through a flare process and a slope surface(113) which is formed on the outer upper side of the expanded part. The gasket is coupled to the inner side of the expanded part and has an inverted V-shaped groove(121) on the inner surface thereof. The ring joint has an insertion groove(131) in which the expanded part is inserted and first and second slope pressing surfaces The upper part of the insertion groove has a length shorter than the sum of the thickness of the expanded part of the pipe and the thickness of the gasket. The thickness of the outer lower part of the ring joint increases according to the expansion of the first and second slope pressing surfaces.

Description

Non-welded pipe joints using flare processing {NON-WELDING PIPE JOINT USING FLARE PROCESSING}

The present invention relates to a non-welded pipe joint using flare processing, and in detail, the pipe end is extended to 90 ° through flare processing, and an inclined surface is formed on the outer surface of the expanded portion, and the inclined surface and the ring joint correspond to the inclined surface. It relates to a non-welded pipe joint using flare processing to form a slope indentation surface.

Currently, pipes (eg, water and sewage pipes) connect pipes and pipes through various known methods.

The present welding-free connection scheme arranges two pipes in a row, and is fixed by a ring joint between two aligned pipes.

At this time, in order for the ring joint to be reliably seated on the pipe outer circumferential surface, protrusions formed at both ends of the ring joint are positioned in grooves formed in each pipe, so that the two pipes to be arranged in a line are not separated from each other.

In addition, in a ring joint pipe connection structure, grooves should be formed around the pipe outer circumference. This groove is usually machined through a grooving machine, which is machined to 2 mm or less to prevent deformation. The internal structure of the tubular pipe is leaked due to the ring joint being released from the grooves even with slight external bending and shaking, and it also prevents the flow of fluid flowing into the pipe and accumulates fatigue in the pipe material to increase durability. Significant decreases in degrees and elongation) are often exposed to problems (such as tearing of pipes and leakage).

Unlike the pipe connection structure described above, the ring is welded to two pipe peripheral surfaces arranged in parallel with each other in the pipe connection structure of another structure. The ring joint for joining the two pipes has concave grooves adjacent to both ends and forms another space in the center thereof. The ring welded to the two pipes to be joined is designed to be inserted into the recess of the ring joint and to clamp the ring joint so that the two pipes are not separated from each other. In addition, the space formed inside the ring joint accommodates a separate packing member to seal between two opposite pipe ends to prevent leakage of fluid flowing into the pipe.

This ring joint piping connection requires the ring to be welded on the outer circumferential surface of the ring. In order for the ring to fit into the concave groove of the ring joint, the ring position and the concave groove position must be accurately measured. When welding, the ring does not fit with the recess according to the skill of the welder. When the ring and the concave groove are not matched, it is not easy to weld the ring in place in the field, which causes a problem of causing a delay in work and a connection cost.

In order to solve this problem, Korean Utility Model Publication No. 20-0449405 (ring joint pipe connection structure) has been developed and filed.

In the ring joint pipe connection structure having one or more joint pieces in FIG. 1, in a structure for connecting between two pipes 100a and 100b arranged in a line via a ring joint 10 having a circular ring structure, Two grooves (13a, 13b) adjacent to both ends on the inner circumferential surface thereof and a ring joint (10) forming a space portion (14) in the center thereof; And a stopper 23 projecting along the outer circumference of the first end 21, the second end 22, and the second end 22 by a predetermined distance, and received in the grooves 13a and 13b. A tubular coupling unit 20 connected to a first end of the pipes 100a and 100b so as to extend in length at the pipe ends of the pipes 100a and 100b; A packing member 30 accommodated in the space 14; And a conductive wire clip (40) capable of electrically connecting the two pipes (100a, 100b) connected across the ring joint (10), wherein the coupling unit (20) is arranged in two rows. After the pipes 100a and 100b are connected to each other at opposite ends, the stoppers 23 of the two coupling units 20 adjacent to each other are concave to each other 13a of the ring joint 10. And 13b) to be connected to the pipe so as not to be separated.

However, such a ring joint pipe connection structure has a problem in that a manufacturing cost increases because a mold corresponding to the stopper is integrally formed with the pipe in the pipe manufacturing process.

The present invention is to solve the above problems, while expanding the end of the pipe to 90 ° through the flaring process, to form an inclined surface on the outer surface of the expansion pipe, the inclined indentation surface corresponding to the inclined surface in the ring joint It is an object of the present invention to provide a non-welded pipe joint using flare processing to safely transfer fluid to internal pressure, external shock, and earthquake.

In addition, another object of the present invention is to provide a non-welded pipe joint using flaring to increase airtightness by inserting a gasket having an inner circumferential surface extending in a "∧" shape between the pipe and the pipe.

Features of the present invention for achieving the above object,

Pipes each having an end portion flared and interconnected to form an angle of 90 [deg.]; A gasket formed in a ring shape and coupled to an inner surface of the expansion part of the pipe; And a ring joint in which a pair is divided to each other so that the expansion pipe portion of the pipe is inserted into the inner surface to maintain the connection and fixing state, and an insertion groove into which the expansion pipe portion is inserted is formed on the inner surface.

Here, the pipe is formed with an inclined surface having a downward slope at the upper end of the outer surface of the expansion pipe portion.

Here, the gasket is inclined in the direction of the outer circumferential surface, the groove is formed concave in the inner circumferential surface "∧" shape.

Here, the ring joint has a first fastening jaw provided with a first bolt hole at one end thereof is vertically protruded, and a pair of second fastening jaws are provided with a second bolt hole at each other end thereof. A first ring joint; A third fastening jaw provided with a third bolt hole is vertically protruded to correspond to the first fastening jaw of the first ring joint at one end thereof, and is inserted into the second fastening jaw of the first ring joint at the other end thereof. A fourth ringing jaw provided with a fourth bolt hole includes a second ring joint protruding from the fourth bolt hole.

Here, the insertion groove of the ring joint is formed with a length of the upper end portion is smaller than the sum of the thickness of the expansion portion of the pipe and the thickness of the gasket, the first inclined indentation surface is formed in which the stop portion extends outward from the upper end portion And a second inclined indentation surface having a lower end extending outward from an end of the first inclined indentation surface.

Here, the ring joint is increased in thickness so that the lower end of the outer surface reinforces the strength as the first inclined indentation surface and the second inclined indentation surface expand.

According to the non-welded pipe joint using the flaring process of the present invention configured as described above, while extending the end of the pipe to 90 ° through the flaring process, to form an inclined surface on the outer surface of the expansion pipe, and corresponds to the inclined surface on the ring joint By forming the inclined indentation surface, the fluid can be safely transferred to the internal pressure, external shock, and earthquake.

In addition, according to the present invention, the airtightness can be increased by inserting a gasket having an inner circumferential surface extending in a "∧" shape between the pipe and the pipe.

1 is a cross-sectional view showing a conventional ring joint pipe connection structure.
Figure 2 is a perspective view showing the configuration of a non-welded pipe joint using the flaring process according to the present invention.
3 is an exploded perspective view showing the configuration of a weldless pipe joint using flaring according to the present invention.
Figure 4 is a cross-sectional view showing the configuration of the pipe in the weld-free pipe joint using the flaring process according to the present invention.
5 is a cross-sectional view showing the configuration of a gasket in a weldless pipe joint using flaring according to the present invention.
Figure 6 is a cross-sectional view showing the configuration of the ring joint of the welded pipe joint using the flaring process according to the present invention.
7 is a cross-sectional view in a bonded state of the non-welded pipe joint using flaring according to the present invention.
8 to 10 are explanatory views for explaining the bonding process of the weld-free pipe joint using the flaring process according to the present invention.

Hereinafter, with reference to the accompanying drawings the configuration of the non-welded pipe joint using the flaring process according to the present invention will be described in detail.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

Figure 2 is a perspective view showing the configuration of a non-welded pipe joint using a flaring process according to the present invention, Figure 3 is an exploded perspective view showing the configuration of a non-welded pipe joint using a flared process according to the invention, Figure 4 6 is a cross-sectional view showing the configuration of the pipe in the non-welded pipe joint using the flaring process according to the present invention, Figure 5 is a cross-sectional view showing the configuration of a gasket of the non-welded pipe joint using the flaring process according to the present invention, Figure 6 It is sectional drawing which shows the structure of the ring joint among the weldless pipe joints which used the flaring process which concerns on this invention, and FIG. 7 is sectional drawing in the combined state of the weldless pipe joint which used the flare process which concerns on this invention.

2 to 7, the non-welded pipe joint 100 using flare processing according to the present invention includes a pipe 110, a gasket 120, and a ring joint 130.

First, the pipe 110 is a straight pipe or elbow pipe of any one material of steel pipes, non-ferrous metal pipes and PE composite pipe, each end of the interconnected flare is expanded to form an angle of 90 °, expansion pipe 111 An inclined surface 113 having a downward inclination is formed at the upper end of the outer surface.

In addition, the gasket 120 is formed in a ring shape, is coupled to the inner surface of the expansion pipe 111 of the pipe 110, the inner surface is inclined in the direction of the outer circumferential surface, and the inner circumferential surface is concave in the shape of "∧". 121 is formed. Here, the material of the gasket 120 is rubber, EPDM, nitrile (Nitrlie), white nitrile (White Nitrlie), silicon (Silicone), neoprene, Fluoro-elastomer, epichlorohydrin Epichloro-hydrin) and halogenated butyl (Halogenated Butyl) is preferably formed of any one material.

In addition, the ring joint 130 is made of at least one material of stainless steel, steel, and cast iron, the pair is divided to each other so that the expansion portion 111 of the pipe 110 is inserted into the inner surface to maintain the connection and fixing state. Is formed, the insertion groove 131 is formed is inserted into the expansion tube 111 on the inner side.

Here, as shown in FIG. 3, the ring joint 130 has a first fastening jaw 133b having a first bolt hole 133a formed at one end thereof to protrude vertically, and a second bolt hole at the other end thereof. A pair of second fastening jaws 133d having respective ones 133c protrude from the first ring joint 133 and a first end of the first ring joint 133 at one end thereof so as to correspond to the first fastening jaw 133b. The third fastening jaw 135b having the third bolt hole 135a is formed to protrude vertically, and is inserted into the second fastening jaw 133d of the first ring joint 133 at the other end thereof. The fourth fastening jaw 135d provided with 135c is composed of a second ring joint 135 protruding from each other.

Herein, the insertion groove 131 of the ring joint 130 has a length smaller than the sum of the thickness of the expansion portion 111 of the pipe 110 and the thickness of the gasket 120 as shown in FIG. 6. And a first inclined indentation surface 131a having a stop portion extending outwardly from an upper end portion so as to cope with shrinkage when the gasket 120 is press-fitted, and having a lower end portion formed therein. The second inclined press-in surface 131b is formed to extend outward from the end of the c), and the lower end portion of the outer side of the bottom side is reinforced so as to reinforce the strength according to the expansion of the first inclined press-in surface 131a and the second inclined press-in surface 131b. It is desirable for the thickness to be increased.

Hereinafter, with reference to the accompanying drawings, the assembly process and operation of the weld-free pipe joint using the flaring process according to the present invention will be described in detail.

8 to 10 are explanatory views for explaining the bonding process of the weld-free pipe joint using the flaring process according to the present invention.

First, in order to form the expansion pipe 111 of the pipe 110, a flare process is performed. First, the outer circumferential surface of the pipe 110 is fixed to the jig. Next, the end of the fixed pipe 110 is heated by a heating device. Here, the heating may be heated using a preheater, it may be heated to 40 ℃ to 300 ℃ using a separate heating device according to the type of pipe 110. Next, a circular guide roller is inserted into the inside of the end of the heated pipe 110. Finally, by rotating the inserted guide roller 360 ° to process the end of the pipe 110 to be inclined to 90 ° with respect to the horizontal axis of the longitudinal direction of the pipe 110 to the inclined surface 113 having a downward slope to the upper end surface The expansion tube 111 formed is formed.

 At this time, the angle θ of the inclined surface 113 is formed as in Equation 1 below.

Here, t0 is the thickness of the steel pipe and t1 is the thickness of the expansion pipe.

Meanwhile, as shown in FIG. 8, in the state in which the expansion pipe 111 is formed in the pipe 110 as described above, the expansion pipe 111 of the pipe 110 is positioned to correspond to each other, and the gasket 120 is disposed therebetween. Insert

Then, the first ring joint 133 and the first ring joint 133 in the state where the expansion portion 111 and the gasket 120 are positioned on the second inclined indentation surface 131b formed in the insertion groove 131 of the ring joint 130. Tighten the bolt to the 2 ring joint (135).

As shown in FIG. 9, when the bolt is continuously tightened, the first ring joint 133 and the second ring joint 135 form a circular shape, and the insertion groove 131 moves downward, that is, the expansion pipe 111. The first inclined press-in surface 131a is moved along the inclined surface 113 formed in the expansion pipe 111 and simultaneously consolidates the expansion pipe 111 and the gasket 120.

As shown in FIG. 10, when the bolt is continuously tightened, the expansion pipe 111 and the gasket 120 are accommodated between the upper ends of the insertion grooves 131, thereby compressing the gasket 120 to expand the space between the expansion pipe 111. Will be sealed.

Meanwhile, the gasket 120 is more closely contacted with the inner circumferential surface of the pipe 110 by the groove “121” shaped in the gasket 120, and the groove 121 is formed by the pressure generated when the fluid flows. As it happens, the watertight or airtight effect is maximized.

As those skilled in the art would realize, the described embodiments may be modified in various ways, all without departing from the spirit or scope of the present invention. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

110: pipe 120: gasket
130: ring joint

Claims (6)

Pipes each having end portions connected to each other to be flared and expanded to form an angle of 90 °, having an expansion pipe portion, and an inclined surface having a downward slope at an upper end of the outer surface of the expansion pipe portion;
A gasket formed in a ring shape, the side surface of which is inclined toward the outer circumferential surface, and the inner circumferential surface is recessed in a U-shaped shape, the gasket being coupled to the inner surface of the expansion pipe portion of the pipe; And
A pair is divided into each other so that the expansion pipe portion of the pipe is inserted into the inner surface to maintain a connection and fixing state, and an insertion groove into which the expansion pipe portion is inserted is formed on the inner surface, and an upper end of the insertion groove is an expansion pipe portion of the pipe. A first inclined indentation surface having a length smaller than the sum of the thickness of the gasket and a stopper portion extending outwardly from the upper end, and having a lower end extending outwardly from an end of the first inclined indentation surface; A two-incline indentation surface is formed, the lower end of the outer surface includes a ring joint whose thickness is increased so as to reinforce the strength according to the expansion of the first inclination indentation surface and the second inclination indentation surface;
The ring joint,
A first ring joint having a first fastening jaw provided with a first bolt hole at one end thereof vertically protruding, and a pair of second fastening jaws protruding with a second bolt hole respectively formed at the other end thereof;
A third fastening jaw provided with a third bolt hole is vertically protruded to correspond to the first fastening jaw of the first ring joint at one end thereof, and is inserted into the second fastening jaw of the first ring joint at the other end thereof. A weldless pipe joint using flare processing, characterized in that the second ring joint is provided with a fourth fastening jaw provided with a fourth bolt hole. delete delete delete delete delete

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