KR20240003080A - No hub coupling joint unit for Pipes - Google Patents

Abstract

The present invention relates to a no-hub coupling joint unit for straight pipes configured to easily and quickly connect the ends of various metal or synthetic resin pipes, such as sewage pipes or underground horizontal pipes, installed inside and outside of a building structure.
The present invention is a structure for binding the ends of straight pipes installed inside and outside of a building structure to each other by a coupler. This coupler has a body divided into a body that can be opened and closed on one side of the outer diameter, assembled by a hinge, and at the same time, fastened to one another. It is configured to be loosened and tightened using an element, and a receiving groove is formed on the inner diameter side of the body by locking protrusions protruding inward from both edges, and within this receiving groove, the ends of both straight pipes to be connected to each other are positioned and fixed. a ring stopper to stop the flow, an elastic ring assembled on one side of the inner circumferential surface of the ring stopper to press and secure the outer diameter of one straight pipe, and a ring stopper located on both sides of the protruding pieces formed on the inner diameter of the ring stopper to control the fluid flowing inside the straight pipe. A rubber ring is provided to prevent water leakage.

Description

No hub coupling joint unit for straight pipes {No hub coupling joint unit for Pipes}

The present invention is a no-hub coupling joint unit for straight pipes configured to easily and quickly connect the ends of various metal or synthetic resin pipes such as sewage pipes and underground horizontal pipes installed inside and outside of building structures. It's about.

In architectural structures such as general industrial plants, buildings, or apartments, pipes of various types are installed to transport fluids such as cold, hot water, and gas necessary for everyday life, as well as domestic sewage, to their respective destinations.

In most pipes, water leakage may occur due to expansion or contraction due to changes in surrounding temperature and pressure of the fluid being transported, or damage or deformation of the pipe due to temperature differences such as thermal expansion as well as external shocks such as micro-earthquakes. there is.

In addition, in order to compensate for the expansion and contraction of pipes in apartments, etc. in apartments, loop pipes that require a little more space are installed in the basement, or guides are provided on both sides of the expansion joint in the case of riser pipes. Anchors are installed at both ends.

Typically, metal pipes used for piping are manufactured by pouring molten liquid raw materials into a mold and hardening them, while synthetic resin pipes are manufactured by drawing using dies of various diameters. Since it is manufactured by pulling it out long, the length can be extended by cutting it to the required length in the field or assembling it using various types of binding structures between pipes.

Regarding this connection method of straight pipe, as an example, as shown in FIG. 1, the joint body 2 having an insert cylinder portion 3, and the end of the pipe inserted to the outside of the insert cylinder portion 3 are elastically formed. A clamp ring (5) formed with a slit for tightening with a clamping force, and a diameter expansion piece (6) supported by being inserted into the slit in the outer diameter direction so as to expand the diameter of the clamp ring (5) against the elastic force of the clamp ring (5). ) and a regulating sleeve (10b) fitted to the outside of the clamp ring (5) to regulate the bouncing motion in the direction of the outer diameter of the diameter expansion piece (6).

However, this conventional pipe joint method cannot ensure a reliable pipe joint if the diameter expansion piece does not completely fall off or if the protruding diameter piece is caught between the cover and the regulating sleeve, and the pipe fitting inserted into the slit of the clamp ring When the expansion piece falls off and the clamp ring contracts by elastic restoring force to fix the outer circumference of the pipe, the part where the expansion piece of the clamp ring was inserted cannot completely press the outer circumference of the pipe, which reduces airtightness and causes the inside of the pipe to leak. If the pressure is high, there is a risk of fluid leakage.

Moreover, when a cover is used to prevent the diameter piece separated from the clamp ring from being thrown out, the diameter piece is maintained in the space between the regulating sleeve, the outer circumference of the pipe, and the cover, so the pipe joint where the pipe is installed to connect to another pipe cannot be rotated. If you do so, interference will occur and cause considerable inconvenience to the connection work.

Meanwhile, many publications, including Patent Registration No. 0941883 or 0976588, prevent the connector from being twisted when connecting pipes, ensure that multiple bolts for fastening are fastened to the same depth, and that one side of the packing is double-ended. Although technology has been disclosed for “piping connectors” aimed at maintaining watertight formation, these structures all require screw fastening force, so workability is very poor, and moreover, they are constructed by combining multiple parts. Therefore, there is a problem that the cost is bound to be quite expensive.

Registered Patent No. 0941883 (registered on February 4, 2010): Piping connector. Registered Patent No. 0976588 (registered on August 11, 2010): Piping connector. Registered Patent No. 1523307 (registered on May 20, 2015): Pipe connection assembly. Registered Patent No. 1891081 (registered on August 17, 2018): Pipe connection assembly.

The present invention was made in consideration of the problems of the prior art described above, and the main purpose of the present invention is to save materials and significantly improve workability by enabling the ends of straight pipes to be connected to each other to be easily connected using a single coupler. The aim is to provide a no-hub coupling joint unit for straight pipes.

In addition, another object of the present invention is to suppress the negative effects of straight pipe being pushed out due to pressure generated inside the pipe, as well as to more reliably prevent water leakage occurring at the binding portion of the pipe. To provide a no-hub coupling joint unit for use.

In the no-hub coupling joint unit for straight pipe according to the present invention to achieve the above-described object, it is a structure for binding the ends of straight pipe installed inside and outside of a building structure to each other by a coupler, and this coupler is A body divided into openings and closings on one side of the outer diameter is assembled by a hinge and can be loosened and tightened using a single fastening element, and is accommodated on the inner diameter side of the body by a locking protrusion protruding inward from both edges. A groove is formed, and within this receiving groove is a ring stopper for positioning and fixing the ends of both straight pipes to be connected to each other, an elastic ring assembled on one side of the inner circumferential surface of the ring stopper to press and secure the outer diameter of one straight pipe, and , Rubber rings are disposed on both sides of the protruding pieces formed on the inner diameter of the ring stopper to prevent leakage of fluid flowing into the straight pipe.

In addition, of the two straight pipes to be connected, a concave groove is formed on the end of the other pipe to prevent the straight pipe from being separated from the coupler when the fluid pressure rises by inserting a stopper on one side constituting the coupler. will be.

In addition, the elastic ring is configured so that the binding pieces having through holes toward the inner diameter are inclined at intervals at opposing positions and have a cutout on one side.

In addition, the rubber ring is located within the locking protrusions on both sides of the coupler, and is configured to exert elasticity on the entire circumference of the edge portion when pressure is generated inside the straight pipe due to a groove formed on the inside.

The present invention, which has the features described above, allows the ends of a metal or synthetic resin straight pipe manufactured to a predetermined length to be easily connected in a one-touch method using a coupler, so that it can be used as a joint pipe or a hub with a hub as before. Since it does not require a socket or a separate coupler, material consumption can be reduced.

In addition, it can be performed simply and quickly by reducing the operator's man-hours, thereby greatly improving workability.

In addition, the elastic ring and rubber ring installed within the coupler not only prevent the straight pipe from being pushed out even when fluid pressure occurs inside the straight pipe, but also more reliably prevent water leakage occurring at the connection area between the two straight pipes. there is.

Moreover, as the locking protrusion of the coupler is inserted into the concave groove formed at the end of one of the two straight pipes, the force of the straight pipe to separate from the coupler can be more effectively suppressed even if the fluid pressure gradually increases.

1 is a cross-sectional diagram showing an example of a general pipe joint structure;
Figure 2 is a cross-sectional configuration diagram of Figure 1;
Figure 3 is a view showing the state before connection of the pipe connection assembly disclosed in Sun Registration Patent No. 1523307;
Figure 4 is a diagram showing the connection state of Figure 3;
Figure 5 is a diagram showing an elastic ring;
Figure 6 is a diagram showing a pressure ring;
7 is a view showing a clamp;
Figure 8 is an exploded perspective view showing a coupling joint unit for straight pipe according to the present invention;
Figures 9a and 9b are cross-sectional diagrams of straight pipes in assembled and separated states;
Figure 10 is a cross-sectional view of the elastic ring and rubber ring installed in the ring stopper;
11 a and b are perspective and cross-sectional views of the ring stopper,
Figures 12a and 12b are perspective and top views of the elastic ring,
Figures 13a and 13b are perspective and cross-sectional views of the rubber ring.

The following specific structural and functional descriptions are merely illustrative for the purpose of explaining embodiments according to the concept of the present invention, and the embodiments according to the concept of the present invention may be implemented in various forms.

First, as a preferred example to which the present invention is to be applied, the technology disclosed in Pre-registered Patent No. 1523307 will be extracted and explained, and the resulting problems will be derived, and then the structure and effects of the present invention will be described later.

As shown in Figures 3 and 4, the pipe connection assembly disclosed in the previously registered patent is comprised of a fitting pipe 100, a pressurizing body 200, and a clamp 300.

The fitting pipe 100 is one in which the pipe P to be connected is inserted, and an expansion port whose inner diameter gradually expands is formed at the end, which can be tightened by the clamp 300. This joint pipe 100 has a step formed at the end so that the pipe P is inserted and fixed, and the inner diameter of the insertion portion may be formed to be larger than the inner diameter of the pipe P within the range of 5 mm to 7.5 mm.

In addition, the pressurizing body 200 is configured to include a pressurizing ring 210 and an elastic ring 220 that are disposed opposite to the expansion port and are tightened by a clamp 300. As this pressure ring 210 is tightened by the clamp 300, it pressurizes the elastic ring 220, and this elastic ring 220 is made of an elastic material such as synthetic rubber and is connected to the pressure ring 210 and the confirming ball. is inserted between

In addition, as the clamp 300 surrounds and tightens the expansion port and the pressurizing body 200, the elastic ring 220 is pressed and comes into close contact with the outer peripheral surface of the tube (P).

The expansion port consists of an expansion inclined portion 111 and a guide portion 112. The expansion inclined portion 111 is formed to be inclined so that the inner diameter gradually expands from the inner peripheral surface of the end of the fitting pipe 100, and is formed at an inclined inner peripheral surface (111a) and the first contacting the inner peripheral surface of the clamp 300 on the outer peripheral surface of the end of the fitting pipe 100. It is provided with an inclined outer peripheral surface (111b).

In addition, the guide portion 112 is parallel to the longitudinal direction of the joint pipe 100 at the ends of the expanded inclined portion 111, that is, the ends of the inclined inner peripheral surface (111a) and the inclined outer peripheral surface (111b).

The inclination angle A of the inclined inner peripheral surface 111a is formed to be inclined in the range of 105 degrees to 115 degrees counterclockwise toward the outer circumference based on the longitudinal direction of the fitting pipe 100. And the inclination angle B of the inclined outer peripheral surface 111b is formed to be inclined in the range of 115 degrees to 125 degrees counterclockwise toward the outer circumference based on the longitudinal direction of the fitting pipe 100.

The elastic ring 220 of the pressurizing body 200 is configured so that its thickness can be fitted into the inner diameter of the guide portion 112 so as to be inserted into the expansion port side, so that mutual friction can be avoided when the tube P is inserted. . That is, the elastic ring 220 is provided with a pressure contact surface 221, a gap maintenance surface 222, and a fin 223.

The pressure contact surface 221 is arranged to match the inner diameter of the insertion part of the fitting pipe 100 so as to come into close contact with the outer peripheral surface of the pipe P when pressed, and the gap maintenance surface 222 is the pressure contact surface 221. At the end of the pressure ring 210, the inner diameter is formed to be inclined so as to gradually expand. The inclination angle C of the gap maintenance surface 222 is inclined in the range of 5 degrees to 11 degrees clockwise based on the longitudinal direction of the joint pipe 100.

In addition, the fin 223 is formed to have a sharply inclined tip at the end of the pressure contact surface 221 on the expansion port side, so that it penetrates into the fitting pipe 100 when pressed and comes into close contact with the outer peripheral surface of the pipes (P). The inclination angle D of the fin 223 is formed to be inclined in the range of 35 to 45 degrees clockwise based on the longitudinal direction of the fitting pipe 100.

In addition, the pressing ring 210 of the pressing body 200 has a close contact opposing surface 211, a protruding outer peripheral surface 212, a tightening force transmission inclined surface 213, a tightening force transmitting inner peripheral surface 214, a second inclined outer peripheral surface 215, and It is provided with a tightening slope (216).

The close contact opposing surface 211 is formed to face the guide portion 112 of the expansion mouth and is a surface that comes into close contact with the guide portion as it is pressed, and the protruding outer peripheral surface 212 is located at the inner circumferential end of the close contact opposing surface 211. It is a surface that protrudes horizontally to the longitudinal direction of the joint pipe 100.

In addition, the tightening force transmission inclined surface 213 is formed to be gradually inclined from the end of the protruding outer peripheral surface 212 on the side of the expansion port to the inner side of the pressure ring 210, so that as the clamp 300 is tightened, the tightening force is applied to the pressure contact surface 221. so that it can be passed on. The inclination angle E of the tightening force transmission slope 213 is formed to be inclined in the range of 125 to 135 degrees clockwise with respect to the longitudinal direction of the fitting pipe 100.

In addition, the tightening force transmission inner peripheral surface 214 is formed parallel to the gap maintenance surface 222 at the inner peripheral side end of the tightening force transmission slope 213 and guides the transmission direction of the tightening force toward the tightening force transmission slope 213, and the second The inclined outer peripheral surface 215 is formed to be gradually inclined from the end of the tightening force transmission inner peripheral surface 214 on the pressure ring 210 side to the inner side of the pressure ring 210 along the outer circumferential direction and comes into contact with the inner peripheral surface of the clamp 300. The inclination angle F of the second inclined outer peripheral surface 215 is formed to be inclined in the range of 105 to 115 degrees clockwise based on the longitudinal direction of the fitting pipe 100.

In addition, the tightening inclined surface 216 is formed to be gradually inclined from the outer end of the second inclined outer peripheral surface 215 to the inner side of the pressure ring 210 along the outer circumferential direction, so that the pressure ring 210 is tightened as the clamp 300 is tightened. enable pressure. The inclination angle G of the tightening slope 216 is formed to be inclined in the range of 125 to 135 degrees clockwise based on the longitudinal direction of the fitting pipe 100.

Here, a coupling groove 224 is formed in the elastic ring 220 into which the protruding outer peripheral surface 212, the tightening force transmission inclined surface 213, and the tightening force transmission inner peripheral surface 214 are inserted and fitted to conform to the shape of the pressure ring 210. In response, a structure that is interconnected is implemented.

Meanwhile, as shown in Figure 7, the clamp 300 is hinged at least in one place so as to surround the diagnosing device and the pressing ring 210, and as the opposing surfaces are fastened to each other, the diagnosing device and the pressing ring are connected to each other. It can be tightened while surrounding the ring 210.

A tapered groove portion 310 surrounding the expansion port and the pressure ring 210 is formed on the inner peripheral surface of the clamp 300. As both sides of the tapered groove portion 310 are tightened, it has a corresponding inclination angle so that it can slide on the first inclined outer peripheral surface 111b and the second inclined outer peripheral surface 215, and the tightening inclined surface 216 and the second inclined surface 215 are tightened. The inflection point of the inclined outer peripheral surface 215 makes it possible to pressurize the expansion port and the pressure ring 210.

However, in this prior art, the clamp 300 must be installed on both sides with a separate fitting pipe 100 interposed between the two pipes to be connected, which is a factor that increases the unit cost due to an increase in the amount of materials consumed. Of course, workability is greatly reduced.

In addition, since the pressure ring 210 and the elastic ring 220 to form the pressure body 200 must be combined and inserted into the enlarged diameter portion of the fitting pipe 100, interference between them occurs, making the assembly work of straight pipe. This does not happen smoothly.

Moreover, when the pipe (P) is connected by tightening the clamp (300), even if the force exerted by the pressure contact surface (221) of the elastic ring (220) is applied, the pressure generated inside the pipe cannot be withstood and the pipe is separated from the fitting pipe (100). The problem of (P) being separated occurs.

In consideration of various problems in the prior art, the present applicant seeks to propose a joint structure that not only makes the joining work of straight pipe by a coupler simple, but also remains more robust and stable, so that the connected straight pipe is not pushed out even when internal pressure occurs. This will be described in detail with reference to Figures 8 to 13 a and b.

As shown in each of these drawings, in the present invention, the ends of the straight pipes 50A and 50B installed inside and outside the building structure are configured to be coupled to each other in a one-touch manner using a coupler 60. .

In other words, the straight pipes 50A and 50B are intended to induce fluid flow, and as before, they can be manufactured into various diameters by conventional molding methods such as casting or drawing, and in most cases, according to the design specifications of the building structure. The length is extended by connecting the ends of the straight pipes 50A and 50B extracted to a certain length using a coupler 60.

This coupler 60 has a body 61 divided into two so that it can be opened and closed, and is assembled by a hinge 62, and at the same time, a flange 63b with a through hole 63a on the other side is formed, so that one bolt 64a is used. and a nut 64b so that it can be loosened or tightened using a fastening element.

In Figure 8, it is shown that the body 61 is divided into two and opened and closed by one hinge 62 and a fastening element. However, after dividing the body into three, two hinges and one fastening element are used. Of course, it can be configured to open and close.

A receiving groove 66 is formed on the inner diameter side of the body 61 constituting the coupler 60 by locking protrusions 65a and 65b protruding inward from both edges. Here, in the case of the locking protrusions 65a and 65b, one side is formed to be slightly longer than the other side.

In addition, among the two straight pipes (50A, 50B) to be connected to each other, a concave groove (51) is formed on the end side of one of the straight pipes (50B), and the length of the coupler (60) is long into this concave groove (51). By inserting the formed locking protrusion 65b, it is possible to prevent the straight pipe 50B from being separated from the coupler 60 when the fluid pressure rises.

In the receiving groove 66 of the coupler 60, there is a ring stopper 70 for positioning the ends of the straight pipes 50A and 50B assembled on both sides, and an elastic ring stopper 70 is provided on the inner circumferential surface of the ring stopper 70. An elastic ring 80 is installed to secure the straight pipe 50A on one side, and a rubber ring 90 is provided to prevent fluid flowing into the straight pipe 50A and 50B from leaking.

As shown in Figure 11 a and b, the ring stopper 70 has a protruding piece 72 formed at the center of the inner diameter of the cylindrical body 71, so that when assembling the straight pipes 50A and 50B from both sides, these The insertion position is determined by ensuring that the ends of the straight pipes 50A and 50B are held together.

In addition, steps 73 are formed on both sides of the protruding piece 72, and an elastic ring 80 is mounted on one side of the step 73 and a rubber ring 90 is installed on the other side. It is designed to be deployed.

That is, as shown in FIG. 10, the elastic ring 80 and the rubber ring 90 are sequentially assembled on the left side of the protruding piece 72 formed on the inner diameter portion of the ring stopper 70, and the elastic ring 80 is on the right side. ) Only the rubber ring (90) is assembled.

As shown in Figures 12a and 12b, the elastic ring 80 is formed by spaced apart binding pieces 81b having holes 81a in the inner diameter portion at opposing positions, and at the same time, a cutout portion is formed on one side of the elastic ring 80. (82) can be configured to form.

Here, in the case of the binding pieces 81b, the drawing shows that 5 pieces are formed at opposing positions based on the center of the inner diameter, but of course, they can be formed around the entire circumference, and 3 pieces are spaced at predetermined intervals. It is also possible to form them so that they protrude one to four at a time or to form them asymmetrically.

In addition, the binding pieces (81b) protruding toward the inner diameter of the elastic ring (80) have elasticity as they are inclined to form a slight angle, and are formed around the inner circumference of the ring stopper (70) by the cutout portion (82) on one side. Steps 73 formed on both sides of the surface allow for easy assembly.

As shown in Figure 13 a and b, the rubber rings 90 are respectively interposed within the locking protrusions 65 on both sides of the coupler 60, and at the same time are connected to the straight pipes 50A and 50B by grooves 91a formed on the inside. ), when the pressure of the fluid flowing inside increases, elastic force acts on the entire circumference of the edge portion (91b). That is, it is disposed between the locking protrusion 65 of the coupler 60 and the elastic ring 80 to prevent water leakage.

With this configuration, the elastic ring 80 is assembled on one side of the inner diameter of the ring stopper 70, seated on the step 73, and then the rubber ring 90 is inserted, and only the rubber ring 90 is inserted on the other side. By simply placing it in the receiving groove 66 of the coupler 60 in the inserted state, one integrated coupler 60 can be formed.

In this state, the end of each straight pipe (50A, 50B) is fixed to the side of the protruding piece 72 formed on the ring stopper 70 in the coupler 60, and is provided on one side of the body 61 of the coupler 60. The ends of both straight pipes 50A and 50B are connected by fastening the nut 64b to the bolt 64a assembled through the through hole 63a of the flange 63b. At this time, the ends of the straight pipes 50A and 50B are connected to the bond formed in the elastic ring 80. The pieces 81b can be pressed and fixed to the outer diameter of one side of the straight pipe 50A.

In addition, in the case of the other straight pipe (50B), the locking protrusion (65b) constituting the coupler (60) is maintained by being inserted into the concave groove (51) formed near the end of the straight pipe (50B), so that the straight pipe (50A, Even if the pressure of the fluid flowing inside 50B) increases, it is possible to sufficiently prevent separation from the coupler 60.

In this way, the binding piece 81b of the elastic ring 80 is in close contact with the outer diameter of the straight pipe 50A on one side, and the locking protrusion 65b of the coupler 60 is attached to the concave groove 51 of the other straight pipe 50B. By being strongly inserted, adverse effects such as the straight pipes (50A, 50B) being pulled out of the coupler (60) due to an increase in fluid pressure flowing through the straight pipes (50A, 50B) will not occur, and both sides of the inner diameter of the ring stopper (70) will be removed. Water leakage can be reliably prevented by the rubber ring 90 mounted on the.

In addition, in the above-described embodiment, a method of binding the ends of both straight pipes to each other was explained, but of course, the same can be applied when connecting an elbow or T-tube for changing direction.

As previously explained, according to the no-hub coupling joint unit for straight pipe according to the present invention, the ends of a metal or synthetic resin pipe manufactured to a predetermined length can be easily connected in a one-touch method using a single coupler, which is different from the previous method. As there is no need for a joint pipe or socket with a hub or a separate coupler, material consumption can be reduced.

In addition, it can be performed simply and quickly by reducing the operator's man-hours, thereby greatly improving workability.

In addition, the elastic ring and rubber ring installed within the coupler not only prevent the straight pipe from being pushed out even when fluid pressure occurs inside the straight pipe, but also more reliably prevent water leakage occurring at the connection area between the two straight pipes. there is.

Moreover, as the locking protrusion of the coupler is inserted into the concave groove formed at the end of one of the two straight pipes, the force of the straight pipe to separate from the coupler can be more effectively suppressed even if the fluid pressure gradually increases.

The technical object of the present invention is achieved by the technical configuration as described above, and although it has been described with limited examples and drawings, it is not limited thereto and the technical idea of the present invention can be understood by those skilled in the art in the technical field to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalence of the claims described below.

50A, 50B: Straight pipe 51: Concave groove
60: Coupler 61: Body
62: Hinge 63a: Through hole
63b: Flange 64a: Bolt
64b: Nut 65a, 65b: Locking jaw
66: Receiving groove 70: Ring stopper
71: cylindrical body 72: protruding piece
73: Step 80: Elastic ring
81a: through hole 81b: binding piece
82: cutout 90: rubber ring
91a: Groove 91b: Edge portion

Claims (4)

A structure for binding the ends of straight pipes 50A and 50B installed inside and outside a building structure to each other by a coupler 60,
This coupler 60 is configured so that a body 61 divided into openings and closings on one side of the outer diameter can be assembled by a hinge 62 and simultaneously loosened and tightened using a single fastening element, and on the inner diameter side of the body. A receiving groove 66 is formed by locking protrusions 65a and 65b protruding inward from both edges,
In this receiving groove (66), there is a ring stopper (70) for fixing the ends of the straight pipes (50A, 50B) on both sides to be connected to each other,
An elastic ring (80) assembled on one side of the inner peripheral surface of the ring stopper (70) to press and secure the outer diameter of one straight pipe (50A),
A no-hub coupling for straight pipe, characterized in that rubber rings 90 are disposed on both sides of the protruding pieces 72 formed on the inner diameter of the ring stopper 70 to prevent leakage of fluid flowing inside the straight pipe. joint unit. According to claim 1, of the two straight pipes to be connected, a concave groove (51) is formed on the end side of the other straight pipe (50B), and one side locking protrusion (65b) constituting the coupler (60) is inserted, thereby allowing fluid flow. A no-hub coupling joint unit for straight pipes, characterized in that it is configured to prevent the straight pipes from being separated from the coupler when the pressure rises. According to claim 1, wherein the elastic ring (80) is formed by slanting the binding pieces (81b) having a through hole (81a) toward the inner diameter at intervals at opposing positions, and at the same time has a cutout portion (82) on one side. A no-hub coupling joint unit for straight pipe, characterized in that it is configured to have. The method of claim 1, wherein the rubber rings (90) are respectively interposed within the locking protrusions on both sides of the coupler, and at the same time, the grooves (91a) formed on the inside provide elasticity over the entire circumference of the edge portion (91b) when pressure is generated inside the straight pipe. A no-hub coupling joint unit for straight pipe, characterized in that it is configured to act.

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