KR102088933B1 - structure for connecting circle duct - Google Patents

Abstract

The present invention relates to a circular duct connection structure which is implemented to directly fasten circular ducts by mounting the ducts on a flange without inserting bolts. The circular duct connection structure comprises: two bent portions respectively and integrally formed on each end for connecting two circular ducts to extend, and respectively and vertically bent in the outer direction of the circular duct; a gasket portion formed to be sealed between the inner surfaces of the bent portions when connecting the circular ducts so as to prevent liquid or gas moving inside the circular duct from leaking to the outside; two flange portions formed in a flat circular shape, each having an insertion hole in the center to allow the circular duct to be inserted thereinto, and allowing the circular ducts to be inserted through the insertion hole, when connecting the circular ducts, to come in close contact with the outer surface of the bent portions, respectively; and two fastening portions applying the pressure to the flange portions from the outside to the inside so that the flange portions are respectively in close contact with the outer surfaces of the bent portions, and at the same time, performing fastening between the flange portions so that the gasket portions aresealed between the inner surfaces of the bent portions.

Description

Structure for connecting circle duct}

The technical field of the present invention relates to a circular duct connection structure, and more particularly, to a circular duct connection structure implemented to be mounted on a flange without fastening of a bolt so that it can be fastened.

The circular duct is mainly made of stainless steel, and in particular, it is intended to be used with a fluorine coating on its inner surface in order to protect it from organic components moving through the inside. In addition, the connection structure between the circular ducts is formed in a structure that can be sealed so that the organic component moving through the interior does not flow out into the gap between the circular ducts.

In such a circular duct connection structure, a first through hole is formed in the center of the connecting flange so that the circular duct can penetrate first, and a plurality of second through holes are provided between the edges of the connecting flange to fasten the connecting flange to each other. When the flanges for connection are respectively installed on both outer circumferential surfaces facing each other of the circular ducts, one side of the circular ducts are respectively inserted into the first through holes of the connecting flanges to connect the outer circumferential surfaces of the circular ducts and the flanges for the connection. After being positioned vertically, the connecting flange and the outer part of the circular duct are hermetically welded to each other on the opposite sides of the connecting flange, while the inner part where the ends of the connecting flange and the circular duct are abutted are hermetically welded to each other. The circular duct by welding the connecting flanges vertically to the outer circumference of each end of the circular duct. After the flanges for connection are respectively installed on the outer circumferential surface of each end, a gasket is installed between the flanges for connection, and a bolt is formed through the washer in the second through-hole of the connecting flange, and the screw formed on the outer circumferential surface of the bolt This is achieved by interposing the washer on the part and tightening the nut. However, when the organic components moving through the interior of the circular duct connection structure are condensed and condensate and organic liquid are generated, condensate and organic liquid generate fine grooves on the face and gasket of the connecting flange, and the organic properties through the fine grooves Minute leakage may occur.

Korean Patent Registration No. 10-1791943 (Registration on October 25, 2017) discloses an organic exhaust duct connection structure in which a circular flange is connected to a circular duct formed on one surface, and a first moving hole through which fluid moves is provided. It is provided with a first flange that is formed to be bent outwardly at one end, and the first flange has a first protruding portion made of one or more first protrusions to prevent the fluid moving to the first moving hole from flowing out through the first flange. A first duct provided; It is provided to be spaced apart from the first duct, and there is provided a second moving hole through which fluid moves, one end is provided with a second flange formed to be bent outward, and the second flange has fluid moving into the second moving hole. A second duct provided with a second protrusion comprising one or more second protrusions to prevent leakage through the second flange; A rigid gasket provided between the first flange and the second flange and having a through hole through which the fluid passes; And a coupling member that is inserted into the first to third connection holes formed in the first flange, the second flange, and the gasket, and engages the first flange, the gasket, and the second flange in close contact with each other. Has a triangular shape, and a first watertight groove and a second watertight groove are inserted into the upper ends of the first protrusion and the second protrusion, respectively, and the first watertight groove and the second watertight groove are respectively formed on the first flange and the second flange. The first communication hole and the second communication hole communicating with the groove are formed. According to the disclosed technology, the first duct and the second duct in which the first flange and the second flange are integrally connected are easily connected, and condensed water and organic matter generated as the organic exhaust gas moving into the interior of the first duct and the second duct is condensed It can prevent the liquid from flowing out.

Korean Registered Patent No. 10-0819949 (Registration on March 31, 2008) is easy to assemble in a straight duct connection, L-shaped duct connection or T-shaped duct connection, and a ring formed separately without welding the duct and flange Disclosed is a connection method and a connection structure of a circular duct that reduces time and cost by using a flange, and can mass-produce ducts and flanges to shorten the delivery time (delivery period). According to the disclosed technology, the circular flanges are integrally bent at both ends of the circular ducts which are joined to each other by the flange forming apparatus at right angles to the outside with respect to the outer circumferential surface, and the liquid or gas inside the duct is not leaked to the outside. Gaskets disposed between the flanges, ring flanges in which the inner circumferential surfaces of the circular ducts are installed on the outer circumferential surfaces of the circular ducts and the outer sides of the circular flanges symmetrically with respect to the center line of the gasket, and the circular flanges are pressed to seal the gaskets. It is characterized in that it consists of a plurality of fastening bolts through each of a plurality of through holes each formed in the ring flange so as to press tightly and engage with a plurality of nuts.

In the conventional technology as described above, since it is necessary to insert and fasten into the insertion hole of the flange directly by using a bolt and a nut, there is a disadvantage that it is difficult to insert and fasten the insertion hole one by one, and also moves through the interior of the circular duct connection structure. When the organic component is condensed to generate condensed water and organic liquid, the condensed water and the organic liquid generate fine grooves on the surface and gasket of the bent portion, and the organic component may leak through the micro groove.

Korean Registered Patent No. 10-1791943 Korean Registered Patent No. 10-0819949

The problem to be solved by the present invention is to solve the disadvantages as described above, to provide a circular duct connection structure implemented to be fastened by mounting on a flange without inserting a bolt.

As a means for solving the above-described problem, according to a feature of the present invention, the two circular ducts are formed to be extended to each end integrally with each other, and the two are formed to be bent respectively vertically in the outer direction of the circular duct. Bends of dogs; A gasket part that is closed between the inner surfaces of the bent portion when the circular duct is connected, and blocks liquid or gas moving inside the circular duct from leaking to the outside; Two flanges formed in a flat plate shape, each having an insertion hole in the center to insert a circular duct, and inserting a circular duct through the insertion hole when connecting the circular duct, so as to be formed close to the outer surface of the bent portion, respectively; By applying pressure to the flange portion from the outside to the inside, so that the flange portion is in close contact with each other on the outer surface of the bent portion, and at the same time, the gasket portion is sealed between the two flange portions to be sealed between the inner surface of the bent portion It provides a circular duct connection structure including a fastening portion.

In one embodiment, the gasket portion is characterized in that it is formed equal to or larger than the circumferential size of the bent portion.

In one embodiment, the flange portion, characterized in that the bent portion or the gasket portion is formed equal to or larger than the circumferential size.

In one embodiment, the gasket portion, the gasket is formed between the inner surface of the bent portion when connected to the circular duct, the internal gasket for primarily blocking the liquid or gas moving inside the circular duct to prevent leakage to the outside; And the cross-section is formed in a 'U' shape is formed so as to surround the outer surface and the end of the bent portion, when the circular duct connection is formed between the outer surface of the bent portion and the inner surface of the flange portion at the same time the bent portion It is characterized in that it comprises an outer gasket that is closed at the end and is secondarily blocked to prevent liquid or gas from moving inside the circular duct from leaking to the outside.

In one embodiment, the outer gasket is characterized in that it is formed extending between the circular duct and the insertion hole of the flange portion.

In one embodiment, the gasket portion, the cross-section is formed in a 'c' shape is formed to surround the inner surface, the outer surface and the end of the first bent portion, one side between the inner surface of the bent portion when connecting a circular duct At the same time as being hermetically formed, the other side is hermetically formed between the outer face of the first bent portion and the inner face of the first flange portion, so that a liquid or gas moving inside the circular duct is prevented from leaking to the outside. 1 gasket; And the cross-section is formed in a 'U' shape is formed to surround the inner surface, the outer surface and the end of the second bent portion, and when the circular duct is connected, one side is formed closed between the inner surface of the bent portion, and the other side It characterized in that it comprises a second gasket for sealingly formed between the outer surface of the second bent portion and the inner surface of the second flange portion, so that the liquid or gas moving inside the circular duct does not leak to the outside. do.

In one embodiment, the first gasket is characterized in that it extends between the circular duct and the insertion hole of the first flange portion.

In one embodiment, the second gasket is characterized in that it extends between the circular duct and the insertion hole of the second flange portion.

In one embodiment, the flange portion is formed at a position facing the center portion of the bent portion, characterized in that it comprises a bead for reinforcing when applying pressure to the flange portion from the outside to the inside by the fastening portion .

In one embodiment, the flange portion is formed on the outer surface corresponding to the position opposite to the outer end of the bent portion, when fastened through the flange portion by the fastening portion, inserting one side of the fastening portion fixed ( That is, it comprises two or more clamp grooves for mounting).

In one embodiment, the fastening part, when fastening through the flange portion by the fastening part, provided with a clamp protrusion for being inserted and fixed (ie, mounted) in the clamp groove on one side, centering the through hole Two clamps provided on the part; And a bolt for fastening between the clamps by engaging the nut through the through-hole of the clamp when fastening through the flanges by the fastening unit.

In one embodiment, the clamp is formed on the other side, is in contact with each other when fastened through the flange portion by the fastening portion, a distance for forming a distance equal to or greater than the distance between the flange portions It is characterized by further comprising a forming protrusion.

In one embodiment, the fastening part is inserted into the bolt, located between the head of the bolt and the first clamp, or between the second clamp and the nut, and passes between the flange parts by the fastening part When fastening, it characterized in that it further comprises a flat washer or a spring washer to make the coupling of the nut and the bolt more robust.

In one embodiment, the fastening portion is formed between the clamps, a distance forming plate for forming a distance equal to or greater than the distance between the flange portions when fastened through the flange portion by the fastening portion It is characterized by further comprising.

In one embodiment, the flange portion, it characterized in that it comprises two or more through-holes formed through the opposite to the position beyond the end of the bent portion.

In one embodiment, the fastening portion, when fastening between the flange portion by the fastening portion, two or more bolts for fastening between the flange portion by engaging the nut through the through-hole of the flange portion It characterized in that it comprises a.

As an effect of the present invention, by providing a circular duct connection structure implemented to be mounted on a flange without bolt insertion, the bolt can be inserted into the insertion hole individually, making it easier to fasten, and also a gasket. By implementing the double installation, when the organic components moving through the inside of the circular duct connection structure is condensed and condensed water and organic liquid are generated, even if the condensed water and the organic liquid generate fine grooves on the surface and gasket of the bent portion, the corresponding micro grooves That is, it is possible to prevent the leakage of organic components.

1 is a view illustrating a circular duct connection structure according to an embodiment of the present invention.
FIG. 2 is a view for explaining the gasket portion in FIG. 1 as a first example.
3 is a view for explaining the gasket portion in FIG. 1 as a second example.
4 is a view for explaining the flange portion and the fastening portion in FIG. 1 as a first example.
5 is a view for explaining the flange portion and the fastening portion in FIG. 1 as a second example.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains may easily practice. However, since the description of the present invention is only an example for structural or functional description, the scope of the present invention should not be interpreted as being limited by the embodiments described in the text. That is, since the embodiments can be variously modified and have various forms, it should be understood that the scope of the present invention includes equivalents capable of realizing technical ideas. In addition, the purpose or effect presented in the present invention does not mean that a specific embodiment should include all of them or only such an effect, and the scope of the present invention should not be understood as being limited thereby.

The meaning of the terms described in the present invention should be understood as follows.

Terms such as "first" and "second" are for distinguishing one component from other components, and the scope of rights should not be limited by these terms. For example, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. When a component is said to be "connected" to another component, it may be understood that other components may exist in the middle, although they may be directly connected to the other component. On the other hand, when a component is said to be "directly connected" to another component, it should be understood that no other component exists in the middle. On the other hand, other expressions describing the relationship between the components, that is, "between" and "immediately between" or "adjacent to" and "directly neighboring to" should be interpreted similarly.

Singular expressions are to be understood as including plural expressions unless the context clearly indicates otherwise, and terms such as "comprises" or "have" include the features, numbers, steps, actions, components, parts or components described. It is to be understood that a combination is intended to be present, and should not be understood as pre-excluding the existence or addition possibilities of one or more other features or numbers, steps, operations, components, parts or combinations thereof.

All terms used herein have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains, unless otherwise defined. The terms defined in the commonly used dictionary should be interpreted to be consistent with the meanings in the context of the related art, and cannot be interpreted as having ideal or excessively formal meanings unless explicitly defined in the present invention.

Now, a circular duct connection structure according to an embodiment of the present invention will be described in detail with reference to the drawings.

1 is a view illustrating a circular duct connection structure according to an embodiment of the present invention.

Referring to Figure 1, the circular duct connection structure 10, two bent portions (110, 210), gasket portion 120, two flange portions (130, 230), a plurality (ie, two or more thereof) Fastening part (140, 240).

The bent portions 110 and 210 are formed to be integrally extended to each end connecting the two circular ducts to each other, so that they are respectively bent vertically in the outer direction of the circular duct.

The gasket portion 120 is sealed between the bent portions 110 and 210 (that is, the inner surface) when the circular duct is connected, thereby blocking liquid or gas moving inside the circular duct from leaking to the outside.

In one embodiment, the gasket portion 120 may be formed equal to or larger than the circumferential size of the bent portions 110 and 120. At this time, the gasket portion 120 may be larger than the outer circumferential size of the bent portions 110 and 120 or smaller than the inner circumferential size of the bent portions 110 and 120.

The flange portions 130 and 230 are formed in a flat plate shape, and each has an insertion hole in the center so that the circular duct can be inserted, and when connecting the circular duct, the circular duct is inserted through the insertion hole to bend 110, 120) (that is, the outer surface) to be formed in close contact with each other.

In one embodiment, the flange portion (130, 230), the bent portion (110, 120) (or the gasket portion 120) of the circumferential size (ie, the same as or larger than the size of the outer circumference) may be formed .

The fastening portions 140 and 240 apply pressure to the flange portions 130 and 230 from the outside to the inside so that the flange portions 130 and 230 are in close contact with the bent portions 110 and 120 (that is, the outer surface), respectively. At the same time, the gasket portion 120 is fastened through the flange portions 130 and 230 so as to be sealed between the bent portions 110 and 210 (that is, the inner surface).

In one embodiment, the fastening parts 140 and 240 may be fastened through a plurality of flange parts 130 and 230 in a plurality (preferably, four) at regular intervals.

The circular duct connection structure 100 having the above-described configuration is implemented by mounting the fasteners 140 and 240 on the flanges 130 and 230 without inserting bolts, thereby allowing the bolts to be inserted directly. There is no need to insert it individually, so it is easier to tighten.

FIG. 2 is a view for explaining the gasket portion in FIG. 1 as a first example.

Referring to FIG. 2, the gasket part 120 includes an inner gasket 121 and an outer gasket 122.

The inner gasket 121 is sealed between the bent portions 110 and 210 (that is, the inner surface) when the circular duct is connected, and is primarily blocked so that liquid or gas moving inside the circular duct does not leak to the outside. Do it.

The outer gasket 122 is formed to have a 'c' cross-section to surround the bent portions 110 and 210 (that is, the outer face and the end), and when the circular duct is connected, the bent portions 110 and 210 (I.e., the outer surface) and the flange portion (130, 230) (i.e., the inner surface) is formed at the same time as the sealing is bent (110, 210) (that is, the end) is formed, the liquid is moved inside the circular duct B. It is secondarily blocked so that the gas does not leak outside.

In one embodiment, the outer gasket 122 may be formed to extend between the circular duct and the flange portions 130 and 230 (that is, the insertion hole), whereby the organic component moving through the interior of the circular duct is condensed and condensed water And when the organic liquid is generated, the condensed water and the organic liquid generate a lot of fine grooves in the bent portions of the bent portions 110 and 210. In this case, the organic component may be prevented from leaking through the fine groove.

When the gasket part 120 having the above-described configuration is installed and implemented in a double way, when the organic components moving through the inside of the circular duct connection structure are condensed to generate condensate and organic liquid, the condensed water and the organic liquid face the bent portion. Even if a fine groove is generated in the gasket, it is possible to prevent the organic component from leaking through the fine groove.

3 is a view for explaining the gasket portion in FIG. 1 as a second example.

Referring to FIG. 3, the gasket unit 120 includes a first gasket 123 and a second gasket 124.

The first gasket 123 is formed so as to surround the bent portion 110 (hereinafter referred to as the first bent portion) (that is, the inner surface, the outer surface, and the end) with a cross-section of 'C' shape, and is circular When the duct is connected, one side is closed between the bent portions 110 and 210 (that is, the inner surface) (ie, between the first bent portion 110 and the second gasket 124), and at the same time, the other side is the first. A bent portion 110 (that is, the outer side) and the flange portion 130 (hereinafter referred to as the first flange portion) (that is, the inner side) is formed closed, the liquid or gas moved inside the circular duct to the outside Double block to prevent leakage.

In one embodiment, the first gasket 123 may be formed to extend between the circular duct and the first flange portion 130 (that is, the insertion hole), whereby organic components moving through the interior of the circular duct are condensed When condensed water and organic liquid are generated, the condensed water and the organic liquid generate a lot of fine grooves in the bent portion of the first bent portion 110. Even in this case, the organic components may be prevented from leaking through the fine grooves.

The second gasket 124 is formed so as to surround the bent portion 210 (hereinafter referred to as the second bent portion) (that is, the inner surface, the outer surface, and the end) by forming a cross section in a 'c' shape, and is circular When the duct is connected, one side is formed between the bent portions 110 and 210 (that is, the inner surface) (ie, between the first gasket 123 and the second bent portion 120), and at the same time, the other side is second. A bent portion 120 (that is, the outer surface) and the flange portion 230 (hereinafter, referred to as the second flange portion) (that is, the inner surface) is formed closed, the liquid or gas moved inside the circular duct to the outside Double block to prevent leakage.

In one embodiment, the second gasket 124 may be formed to extend between the circular duct and the second flange portion 230 (that is, the insertion hole), whereby the organic components moving through the interior of the circular duct are condensed When condensed water and organic liquid are generated, the condensed water and the organic liquid generate a lot of fine grooves in the bent portion of the second bent portion 210. In this case, the organic components may be prevented from leaking through the fine grooves.

4 is a view for explaining the flange portion and the fastening portion in FIG. 1 as a first example.

Referring to FIG. 4, the flange portions 130 and 230 include two beadings 131 and 231 and a plurality of (ie, two or more) clamp grooves 132 and 232. In addition, the fastening portions 140 and 240 include two clamps 141 and 241, a nut 142 and a bolt 143.

Beading (131, 231) is formed at a position facing the central portion of the bent portion (110, 210), to apply pressure to the flange portion (130, 230) from the outside to the inside by the fastening portion (140, 240) When reinforced.

In one embodiment, the beading (131, 231) is a phenomenon in which a bulging surface is generated on the surface of the plate material, by a processing method in which a row-shaped projection (突起; bead) is put in a flat sheet metal or a formed sheet metal, a flange portion ( 130, 230) may be formed on the outer surface, and at this time, a row-shaped groove may be formed on the inner surface of the flange portions 130, 230.

Clamp grooves (132, 232) is formed on the outer surface of the flange portion (130, 230) corresponding to the position facing the outer end of the bent portion (110, 210), the plan by the fastening portion (140, 240) Inserting and fixing (that is, mounting) on one side of the fastening portions 140 and 240 (that is, clamp protrusions 141a and 241a formed on one side of the clamps 141 and 241) when fastening between the branches 130 and 230 ).

The clamps 141 and 241 are clamp protrusions to be inserted and fixed (that is, mounted) in the clamp grooves 132 and 232 when fastening through the flange portions 130 and 230 by the fastening portions 140 and 240. (141a, 241a) is provided on one side, and the through-holes (141b, 241b) for allowing the bolt 143 to pass through are provided in the center portion.

In one embodiment, the clamps 141 and 241 are respectively formed on the other side, and are in contact with each other when fastening through the flanges 130 and 230 by the fastening parts 140 and 240, thereby allowing the flanges 130 , 230) by further comprising a distance forming projection (141c, 241c) for forming a distance equal to or greater than the distance between, the fastening through the flange portion 130, 230 by the fastening portion (140, 240) When doing so, the flange portions 130 and 230 may be applied evenly to the entirety of the bent portions 110 and 210 rather than the ends of the bent portions 110 and 210 (especially, the bent portion 110, 210), so that more pressure can be applied to the bent portion).

When the bolt 143 is fastened through the flange portions 130 and 230 by the fastening portions 140 and 240, the bolts 143 penetrate the through holes 141b and 241b of the clamps 141 and 241, and the nut 142 By coupling with and clamping between the clamps 141 and 241, pressure is applied to the clamps 141 and 241 from the outside to the inside, thereby transferring the pressure to the flanges 130 and 230, thereby providing the flanges 130 and 230. The bent portions 110 and 120 (ie, the outer surface) may be brought into close contact with each other, and the gasket portion 120 may be sealed between the bent portions 110 and 210 (ie, the inner surface).

The fastening parts 140 and 240 having the configuration as described above may further include flat washers 144 and 244 or spring washers 145 and 245.

The flat washers 144 and 244 or the spring washers 145 and 245 are inserted into the bolt 143 and positioned between the head of the bolt 143 and the clamp 141 (hereinafter referred to as a first clamp), Located between the clamp 241 (hereinafter referred to as the second clamp) and the nut 142, when fastening through the flanges 130 and 230 by the fastening portions 140 and 240, the nut 142 And the coupling of the bolt 143 to be more robust.

The fastening parts 140 and 240 having the above-described configuration are formed between the clamps 141 and 241, and when fastened through the flange parts 130 and 230 by the fastening parts 140 and 240, By further comprising a distance forming plate (not shown in the drawing for convenience of description) to form a distance equal to or greater than the distance between the flanges 130, 230, the plan by the fastening parts 140, 240 When fastening between the branches (130, 230), the flange portion (130, 230), the end portion of the bent portion (110, 210), rather than the end of the bent portion (110, 210) to be evenly applied pressure It can be (in particular, more pressure can be applied to the bent portion of the bent portion (110, 210)).

5 is a view for explaining the flange portion and the fastening portion in FIG. 1 as a second example.

Referring to FIG. 5, the flange portions 130 and 230 include a plurality of (that is, two or more) through holes 133 and 233, and the fastening portions 140 and 240 include a plurality ( That is, it includes two or more nuts 146 and bolts 147.

The through-holes 133 and 233 are formed through the flange portions 130 and 230 to face the position beyond the ends of the bent portions 110 and 210, and the flange portions 130 and 140 are fastened by the fastening portions 140 and 240. 230), when fastening between the bolts (147) allows to penetrate.

Bolt 147, when fastening between the flange portion (130, 230) by the fastening portion (140, 240), through the through holes (133, 233) of the flange portion (130, 230), the nut (146) By joining with and fastening between the flange portions 130 and 230, pressure is applied to the flange portions 130 and 230 from the outside to the inside, and the flange portions 130 and 230 are bent portions 110 and 120 (that is, the outside). Surface), and at the same time, the gasket portion 120 may be sealed between the bent portions 110 and 210 (that is, the inner side).

As described above, the embodiment of the present invention is not implemented only through the above-described apparatus and / or operating method, and a program for realizing a function corresponding to the configuration of the embodiment of the present invention, a recording medium in which the program is recorded, etc. It may be implemented, such an implementation can be easily implemented by those skilled in the art to which the present invention belongs from the description of the above-described embodiment. Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

100: circular duct connection structure
110, 210: bend
120: gasket
121: internal gasket
122: external gasket
123: first gasket
124: second gasket
130, 230: flange
131, 231: Beading
132, 232: clamp groove
133, 233: through hole
140, 240: fastener
141, 241: clamp
142, 146: nut
143, 147: bolt
144, 244: flat washer
145, 245: spring washer

Claims (5)

Two bent portions extending integrally to each end connecting the two circular ducts to each other, and bent vertically in the outer direction of the circular duct, respectively; A gasket part that is sealed between the inner surfaces of the bent portion when the circular duct is connected and blocks liquid or gas moving inside the circular duct from leaking to the outside; Two flanges formed in a flat plate shape, each having an insertion hole in the center to insert a circular duct, and inserting a circular duct through the insertion hole when connecting the circular duct, to form close contact with the outer surface of the bent portion, respectively; By applying pressure to the flange portion from the outside to the inside, so that the flange portion is in close contact with the outer surface of the bent portion at the same time, while the gasket portion is sealed between the flange portion so as to be sealed between the inner surface of the bent portion It includes a fastening portion;
The flange portion is formed at a position facing the central portion of the bent portion, and includes a bead for reinforcing when applying pressure to the flange portion from the outside to the inside by the fastening portion;
The fastening portion, when fastening through the flange portion by the fastening portion, is provided with a clamp projection formed on one side to be inserted into the clamp groove formed in the flange portion, the through hole formed in the middle portion Dog clamps; And a bolt for fastening between the clamps by engaging the nut through the through-hole of the clamp when fastening through the flanges by the fastening unit; The clamp is formed on the other side, further provided with a distance forming projection for contacting each other when fastening through the flange portion by the fastening portion, such that a distance equal to or greater than the distance between the flange portions is formed. Circular duct connection structure, characterized in that.
delete delete According to claim 1, The gasket portion,
An inner gasket that is closed between the inner surfaces of the bent portion when the circular duct is connected, and primarily blocks the liquid or gas moving inside the circular duct from leaking to the outside; And
The cross-section is formed in a 'U' shape to be formed to surround the outer surface and the end of the bent portion, and is sealed between the outer surface of the bent portion and the inner surface of the flange portion when the circular duct is connected, and at the same time the end of the bent portion A circular duct connection structure, characterized in that it comprises an outer gasket that is formed in a closed shape and is secondarily blocked so that liquid or gas moving inside the circular duct does not leak to the outside.
The method of claim 4, wherein the outer gasket,
A circular duct connection structure characterized in that it extends between the circular duct and the insertion hole of the flange portion.

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