Pressure reduction device for wastewater drainage pipes

Abstract

The purpose of the present invention is to provide a pressure reduction device for wastewater drainage pipes. The present invention is characterized by comprising: a drum-shaped body (2) having an upper opening (21) and installed on a vertical pipe (10); an elastic membrane (5) elastically coupled to the upper outer side of the body (2) and downwardly curved in the middle, so as to expand convexly upward when positive pressure generated in a horizontal pipe (20) enters through the vertical pipe (10); and an expansion space (22) formed between the downwardly curved elastic membrane (5) and a drain portion (3) at the lower portion of the body (2), so as to accommodate the expanded elastic membrane (5) when the elastic membrane (5) expands downward due to negative pressure. By having a simple and compact structure, with a short vertical length, due to the downwardly curved elastic membrane (5) being coupled to the drum-shaped body (2), the present invention can expand upward or downward in response to successive positive and negative pressures, thereby exhibiting an excellent effect of overall pressure reduction, and minimize damage due to water seal fluctuations, thereby improving durability and extending the product lifespan.

Description

Pressure reducing device for sewage pipes

[0001] The present invention relates to a pressure reducing device for a sewage pipe, which is installed in a sewage and drainage pipe (= vertical drain pipe) of various buildings, and reduces the total generated pressure by responding to both the positive pressure caused by the air pressure rising vertically backward due to stagnation of drainage in the elbow of a horizontal drain pipe (= horizontal drain pipe) under the sewage pipe when drainage occurs, and the negative pressure generated in the horizontal branch pipe (= horizontal drain branch pipe) connected to the sewage pipe and the sanitary equipment of the household at the rear of the drain.

[0002] In general, sewage and drainage pipes are installed so that the horizontal main drain pipe, the horizontal main drain pipe, is connected to the lower part of the vertical main drain pipe, the standing pipe, so that the internal parts are connected through elbows or the like, and sewage and drainage are drained. A horizontal horizontal pipe is installed at the lower part of the vertically installed standing pipe that is connected to the toilet or sewer of each household and drains downwards. When the sewage that falls from the standing pipe is drained to the horizontally drained horizontally, the sewage that is quickly drained from the standing pipe suddenly drops in the horizontal pipe, and a positive pressure is generated due to the impact of the sewage, and in order to prevent the sewage from flowing back through the standing pipe to the sanitary fixtures such as the toilet of each household, a damping device that temporarily absorbs this positive pressure, which is the backflow pressure, to reduce or eliminate the pressure is installed at the lower part of the standing pipe, thereby minimizing the backflow and also minimizing the impact noise.

[0003] As disclosed in Korean Patent No. 1009571 (announced on January 20, 2011), a pressure wave damping device has been developed to dampen the pressure wave, which is a positive air pressure transfer generated in the opposite direction of the fluid when the sewage pipe changes from a vertical pipe to a horizontal pipe (= transverse pipe), and this device is configured to absorb the pressure wave by having a long cylindrical damping tube installed inside, and Patent No. 1272643 (announced on June 10, 2013) is also a pressure extinguishing device for eliminating the pressure wave caused by the fluid from the vertical pipe of the sewage pipe of a high-rise building to a horizontal pipe (= transverse pipe), and has a long cylindrical tube clone installed inside to absorb the pressure wave, and Patent No. 1485864 (announced on January 26, 2015) is also a pressure extinguishing device for absorbing the pressure wave by having a long cylindrical tube clone installed inside to absorb the pressure wave. Technology has been developed for a pressure wave removal device that is installed with a corrugated tube embedded in the surface. Conventional pressure wave reduction devices or removal devices for sewage pipes have a structure that absorbs pressure waves by using a cylindrical or oval tube inside. In order to absorb pressure by the tube, the length had to be long. As a result, when installed on one side of the riser pipe, it is installed parallel to the riser pipe. When the pressure wave reduction device is installed at the bottom of the riser pipe right above the horizontal pipe, a lot of vertical installation space is required, which increases the distance between the slab and the horizontal pipe. When the horizontal pipe is installed under the basement slab, it has the disadvantage of causing inconveniences such as a lot of noise when installed in the riser pipe at a certain height from the basement slab, and when the pressure wave reduction device is installed horizontally in the riser pipe right above the horizontal pipe, some of the sewage water flows into the tube together with the air pressure of the pressure wave, which hinders the expansion and contraction of the tube when a pressure wave occurs in the future. In addition, the sewage water and various foreign substances embedded in the rubber tube cause damage. The tube had many problems, including contamination and damage, which significantly reduced its lifespan.

[0004] In addition, as disclosed in Korean Patent Publication No. 55569 of 2021 (published on May 17, 2021), in a drainage system using a pressure relief device for a drainage pipe consisting of a vertical pipe, a horizontal pipe, an elbow joint pipe, and a pressure relief unit, the tube-type expansion part that expands internally of the pressure relief unit is configured to be long, so that when installed vertically or horizontally on a vertical pipe, horizontal pipe, or slab, additional support members are required to prevent sagging or damage to the connection parts, and the above-mentioned conventional technologies have many problems, such as frequent maintenance work and frequent occurrence of accidents involving leakage of wastewater due to sagging of the pressure wave damping device and damage to the connection parts due to the lack of such support members.

[0005] The present invention is a new technology created to solve various problems of the above-mentioned prior art, and the present invention changes the structure of a pressure reducing device installed in a sewage pipe from a conventional cylindrical tube to a drum-shaped structure with a short vertical length, so that it can be installed even in a narrow space vertically, and when installed, it is installed close to a riser pipe so that a separate support member for supporting the sewage pipe or slab is not required, and it is a pressure reducing device for a sewage pipe that can automatically respond to changes in positive and negative pressure generated in the sewage pipe to reduce both positive and negative pressure, and the present invention has completed the task to be solved by providing a device.

[0006] The present invention also aims to solve the problem of minimizing damage to the device and extending the product life by automatically discharging wastewater immediately without it remaining inside the damping device even if it flows back due to positive pressure.

[0007] In order to solve the above-described problem of the invention, the present invention comprises a pressure reducing device for a sewage pipe, characterized in that it comprises a drum-shaped body part (2) having an upper opening (21) formed therein and installed in a riser pipe (10), an expansion membrane (5) that is elastically connected to the upper outer side of the body part (2) and configured to have a downwardly curved center so as to expand convexly upward when positive pressure generated in a transverse pipe (20) and then introduced through the riser pipe (10) is introduced, and an expansion space part (22) that is spaced apart from a drainage part (3) at the lower part of the body part (2) and the downwardly curved expansion membrane (5) so as to accommodate the expanded expansion membrane (5) when the expansion membrane (5) is downwardly expanded by negative pressure.

[0008] In addition, it is characterized by including a cover (6) configured to protect the elastic film (5) from the upper portion of the elastic film (5) that is coupled to the upper portion of the body (2) by being fixed at the lower end to the body (2), an expansion space (61) formed to accommodate the expanded elastic film (5) when the elastic film (5) expands due to positive pressure by being fixed at the upper inner portion of the cover (6) so as to be spaced apart from the upper portion of the body (2), and an air inlet hole (62) formed to penetrate the inside and outside of the cover (6) so that air inside the cover (6) is discharged or external air is introduced when the elastic film (5) expands or contracts to its original shape on the upper portion of the cover (6).

[0009] In addition, a fastening hole (7) formed to protrude radially at the lower part of the body part (2) so that the body part (2) and the cover (6) are spaced apart when the lower part of the cover (6) is fastened and fixed with a fastening means (71) such as a rivet or a bolt and nut, and a fastening hole (7) configured to correspond to the lateral expansion of the elastic film (5), an open hole (63) formed openly so that the air inside the cover (6) is discharged or external air is introduced when the elastic film (5) expands or contracts to its original shape in the internal expansion space (61) between the fastening holes (7) protruding radially at the lower part of the body part (2), and several guide protrusions (64) formed radially at the lower part of the cover (6) so that the through-hole of the cover (6) through which the rivet or bolt of the fastening means (71) passes when the cover (6) is fixed and installed to the fastening hole (7) of the body part (2) with the fastening means (71) and the through-hole of the fastening hole (7) can correspond to each other, and The feature is that a guide groove (74) is formed on each of the support jaws on which the lower part of the cover (6) is placed at the lower part of the vertical joint piece (73) of the fastener (7) corresponding to the guide projection (64), so that when the guide projection (64) of the cover (6) and the guide groove (74) of the fastener (7) are correspondingly connected, the through hole of the cover (6) and the through hole of the fastener (7) are precisely matched.

[0010] In addition, it is characterized by including a hemispherical upper insertion groove (32) that is open downwardly in an upper sealing portion (31) that protrudes downwardly on the upper outer side of the joint portion (4) of the body portion (2) and is formed to correspond to the upper sealing portion (31) by protruding outwardly on the upper end of a connecting pipe (12) that is connected to the joint portion (4), a hemispherical lower insertion groove (42) that is open upwardly in a lower sealing portion (41) that is formed to correspond to the upper sealing portion (31), and a sealing ring (43) that is formed in the upper insertion groove (32) formed in the upper sealing portion (31) at the lower end of the drain portion (3) and in the lower insertion groove (42) formed in the lower sealing portion (41) at the upper end of the connecting pipe (12) corresponding thereto so that the upper and lower ends are forcibly joined to prevent the wastewater from flowing out.

[0011] In addition, it is characterized by including an elastic fastening part (51) that is connected to the outer surface of the body part (2) so as to have elasticity in the circumferential direction from top to bottom on the outer side of the edge of the elastic film (5), an elastic variable part (52) that is formed so as to be bent downwards in the middle on the inner side of the edge of the elastic film (5) toward the inner lower side of the body part (2) so as to expand convexly upwards when positive pressure is generated, and expands so as to be bent further downwards when negative pressure is generated, and a step part (53) that is formed as a step so as to be bent downwards and inwardly between the outer elastic fastening part (51) and the inner elastic variable part (52) in the elastic film (5) so that the outer surface of the elastic variable part (52) is spaced apart from the inner surface of the body part (2).

[0012] According to a specific means for solving the above-described problem, the pressure reducing device for a sewage pipe of the present invention has a downwardly curved expansion membrane installed in a drum-shaped body, compared to the conventional technology of installing a cylindrical tube that absorbs positive pressure and expands vertically or horizontally, so that the expansion membrane responds to the positive pressure generated in the elbow of the horizontal pipe connected to the lower end of the sewage pipe and rising up to the riser pipe by variably expanding toward the upper part of the body to absorb and attenuate it, and at the same time, the expansion membrane responds to the negative pressure generated in the riser pipe and the horizontal branch pipe when the sewage falls down to the riser pipe by variably expanding toward the inner lower part of the body and pushing it out to attenuate it, thereby automatically responding to the positive and negative pressure generated in the sewage pipe, thereby having the effect of efficiently responding to and attenuating the pressure itself.

[0013] The damping device of the present invention is implemented by combining a downwardly curved flexible membrane with a drum-shaped body, so that even when manufactured in a compact size with a short vertical length, the suction amount is large when positive pressure is generated, thereby maximizing the positive pressure damping efficiency, and an expanded space portion separated from the body portion is formed at the bottom of the downwardly curved flexible membrane, so that when negative pressure is generated, it expands downward, thereby providing an excellent negative pressure relief function, thereby minimizing damage caused by vibration of the seal, and the manufacturing cost can be minimized due to the simple structure, and when installed as a connecting pipe to a riser, the length is not long, so that a separate supporting member such as a hanger, U-bolt, anchor, bolt, or nut for supporting the damping device to the riser, horizontal pipe, or slab is not required, so that installation is easy, and installation is possible in a narrow space, thereby increasing installation efficiency and reducing installation costs.

[0014] In addition, the lower part of the drum-shaped body made of synthetic resin is configured to be narrow and rounded downward so that it is connected to a connecting pipe, so that even if wastewater flows into the body when positive pressure is generated, the upper part is blocked by a flexible membrane, and the wastewater that enters the body is automatically discharged to the inlet pipe through the connecting pipe so that it is discharged again to the inlet pipe, so that the inside of the damping device can always be kept clean.

[0015] In addition, compared to the conventional cylindrical tube structure damping device that was installed at a certain height from the horizontal pipe to block backflow, the damping device of the present invention is structured so that backflowing wastewater and foreign substances are immediately discharged even if it is installed directly above the horizontal pipe, so that the horizontal pipe can be installed close to the slab, making it easy to install the horizontal pipe and more effectively absorbing positive pressure near the horizontal pipe, and preventing the body or expansion membrane of the damping device from being damaged by the backflowing wastewater and foreign substances, thereby improving durability, and preventing the backflowing wastewater and foreign substances from interfering with the attenuation of positive and negative pressures, thereby further doubling operational reliability, and since it does not require minor repair work or replacement of parts, maintenance is easy and repair costs are reduced.

[0016] Figure 1 is a separated three-dimensional view showing an example of the present invention.

[0017] Figure 2 is a three-dimensional view of an assembled bottom surface showing an example of the present invention.

[0018] Figure 3 is a cross-sectional view and a partially enlarged view of Figure 2.

[0019] Figure 4 is an exemplary diagram showing an example of the present invention being applied to a piping system of a building.

[0020] Figure 5 is an exemplary diagram showing another example in which the present invention is applied to a piping system of a building.

[0021] Figure 6 is an example diagram showing the action of generating positive pressure in an elbow connected to a horizontal pipe at the bottom of a vertical pipe in which the present invention is installed.

[0022] Figure 7 is an example showing the expansion action of the elastic membrane due to positive pressure generated in the elbow of the transverse pipe as in Figure 6.

[0023] Figure 8 is an example showing the expansion action of the elastic membrane due to negative pressure generated when passing through the transverse pipe during drainage as in Figure 6.

[0024] The present invention provides a pressure reducing device for a sewage and drainage pipe, which is connected to and installed in a sewage and drainage pipe of various buildings, and reduces the overall generated pressure by responding to both the positive pressure generated in the elbow zone of a horizontal pipe connected to the lower part of the sewage pipe when drainage occurs and the negative pressure generated in the sewage pipe and horizontal branch pipe at the rear of the drain when drainage occurs. This will be described in more detail below with reference to the drawings, but the attached drawings are only examples for easily explaining the content and scope of the technical idea of ​​the present invention and are not limited thereto. The terms used are also only for specifically explaining embodiments and should not be interpreted as being limited to the corresponding terms.

[0025] The pressure reducing device for a sewage pipe of the present invention, as illustrated in FIGS. 1 to 3, is configured to have a body (2) having a relatively low height compared to its width and a wide, round drum shape with a wide width compared to its height, and a retractable membrane (5) having a hollow center is connected to the upper part thereof, and such a reducing device (1) is connected to the lower part of a drain pipe (10) through which sewage is drained in the entire piping system of a building as illustrated in FIGS. 4 and 5 using a connecting pipe (12), and is configured to respond to and offset the pressure generated in the entire sewage pipe, such as the positive pressure generated in the elbow of the horizontal pipe (20) connected to the lower part of the drain pipe (10), or the negative pressure generated in the horizontal pipe (30) connected to a sanitary device such as a toilet in a household while being connected to the drain pipe (10) and the outlet pipe (10) at the rear of the drain during drainage.

[0026] In the pressure reducing device (1) for a sewage pipe of the present invention, the drum-shaped body part (2) is formed with an upper opening (21) as seen in FIGS. 1 and 3, a drainage part (3) having an inner surface of an upper and lower aperture is formed at the lower portion, and a joint part (4) is integrally formed at the lower end of the drainage part (3) so that a joint part (4) is formed to be pipe-joined to a connecting pipe (12) that is connected to a branch pipe (11) of a Tee-shaped branch pipe (111) of FIG. 4 or a cross-shaped branch pipe (112) of FIG. 5, which is installed in a riser pipe (10), and is installed on one side of the riser pipe (10) by a Tee-shaped branch pipe (111) installed in the riser pipe (10), or a pair is installed facing each other with the riser pipe (10) as the center by a cross-shaped branch pipe (112) installed in the riser pipe (10).

[0027] In the pressure reducing device (1) for a sewage pipe of the present invention, the elastic membrane (5) with a hollow center is elastically connected to the upper outer side of the body (2) to block the entire opening (21) and is configured to be bent downward in the center so that it expands convexly upward when positive pressure generated in the transverse pipe (20) and then introduced through the inlet pipe (10) is introduced.

[0028] In the lower part of the body part (2), a drainage part (3) with an inner side slanted downward is formed integrally with the body part (2), and a connecting part (4) is formed integrally so as to protrude downward at the lower end of the drainage part (3) and is connected to a T-shaped branch pipe (111) as in FIG. 4 or a cross-shaped branch pipe (112) as in FIG. 5, which is installed in the inlet pipe (10), and is connected to the upper side of a connecting pipe (12) in the form of an elbow, and a female screw is formed on the upper inner side of the connecting pipe (12) and is screw-connected to a male screw formed on the outer side of the connecting part (4) to connect the pipe, and as a result, a flexible membrane (5) is connected to the inside and the upper part of the inlet pipe (10), so that the air pressure inside the blocked body part (2) and the space through which waste water flows in are connected.

[0029] The damping device (1) of the present invention is provided with a cover (6) that is coupled to the body part (2) and protects the upper elastic film (5), and the cover (6) is configured to protect the elastic film (5) from the upper part of the elastic film (5) coupled to the upper part of the body part (2) by being fixed at the lower end thereof to the body part (2), and is coupled and fixed on the upper inner side of the cover (6) so as to be spaced apart from the upper side of the body part (2) so that an expansion space (61) is formed to accommodate the expanded elastic film (5) when the elastic film (5) expands due to positive pressure, and an air inlet hole (62) is formed penetrating the inside and outside of the cover (6) so that when the elastic film (5) expands or contracts to its original shape in the internal expansion space (61) on the upper side of the cover (6), air inside the cover (6) is discharged or external air is introduced.

[0030] In this way, when the cover (6) is fixed to the body (2) as shown in FIGS. 1 and 3, several radially protruding portions are formed at the lower portion of the body (2) so that when the lower portion of the cover (6) is fixed with a fastening means (71) such as a rivet or a bolt and nut, the body (2) and the cover (6) are spaced apart, and a horizontal support piece (72) fixed to the body (2) in response to the lateral expansion of the elastic membrane (5), and a vertical coupling piece (73) fixed downward and vertically from the horizontal support piece (72) so as to be in contact with the cover (6) and fastened with the fastening means (71), a fastening member (7) is formed, and at this time, an open hole (63) is formed between the fastening members (7) protruding radially at the lower portion of the body (2) so that the air inside the cover (6) is discharged or external air is introduced when the elastic membrane (5) expands or contracts to its original shape in the expansion space (61) inside the cover (6).

[0031] When the cover (6) is fixedly installed in the fastening hole (7) of the body part (2) using a fastening means (71), as shown in FIGS. 1 and 2, several guide protrusions (64) are formed radially on the lower part of the cover (6) so that the through-holes of the cover (6) through which the rivets or bolts of the fastening means (71) pass and the through-holes of the fastening hole (7) correspond to each other, and guide grooves (74) are formed on the support ledge on which the lower part of the cover (6) is placed at the lower part of the vertical joint piece (73) of the fastening hole (7) corresponding to the guide protrusions (64) of the cover (6), so that when the guide protrusions (64) of the cover (6) and the guide grooves (74) of the fastening hole (7) are correspondingly connected, the through-holes of the cover (6) and the through-holes of the fastening hole (7) accurately correspond to each other, thereby facilitating the fastening operation of the fastening means (71).

[0032] In the above invention, an expansion space (22) is formed between the drainage section (3) at the lower part of the body section (2) and the downwardly curved expansion membrane (5) so that the expanded expansion membrane (5) is accommodated when the expansion membrane (5) is downwardly expanded by negative pressure.

[0033] In addition, as shown in FIG. 3, an upper sealing portion (31) protruding downwards is formed on the outer side of the upper portion of the connecting portion (4) of the body portion (2) below the drain portion (3), and a hemispherical upper insertion groove (32) open downwards is formed in the upper sealing portion (31), and a lower sealing portion (41) protruding outwardly corresponding to the upper sealing portion (31) is formed on the upper portion of the connecting pipe (12) that is connected to the connecting portion (4), and a hemispherical lower insertion groove (42) open upwards is formed in the lower sealing portion (41), and a sealing ring (43) is formed in which the upper and lower portions are forcibly joined to each other in the upper insertion groove (32) formed in the upper sealing portion (31) below the drain portion (3) and the lower insertion groove (42) formed in the lower sealing portion (41) above the connecting pipe (12) corresponding thereto to prevent wastewater from leaking out.

[0034] In the pressure reducing device (1) for a sewage pipe of the present invention, the elastic membrane (5) is provided with an elastic fastening portion (51) that is connected to the outer surface of the body part (2) in a band shape on the outer side of the edge of the elastic membrane (5) so as to have elasticity in the circumferential direction from top to bottom, and an elastic variable portion (52) that is formed so that the center of the inner side of the edge of the elastic membrane (5) is bent downward toward the inner lower side of the body part (2) so that it expands convexly upward when positive pressure is generated, and expands so that it is bent downward more downward when negative pressure is generated. The elastic fastening portion (51) is formed relatively thick so that it is firmly coupled to the body part (2), and the elastic variable portion (52) is formed relatively thin so that it can smoothly expand or expand upward or downward due to positive or negative pressure.

[0035] In this elastic film (5), as shown in the enlarged view of Fig. 3, a step portion (53) may be formed between the elastic fastening portion (51) on the outside of the elastic film (5) and the elastic variable portion (52) on the inside to be bent downward and inward, so that the outer surface of the elastic variable portion (52) is spaced apart from the inner surface of the body portion (2).

[0036] And, in the above-mentioned elastic film (5), as shown in FIGS. 1 and 3, the elastic fastening part (51) that is elastically connected to the upper part of the body part (2) is configured with a band-shaped fixing means (8), such as a tightening band, that is fastened outward so that the elastic film (5) does not separate from the body part (2) when the elastic variable part (52) is deformed due to positive or negative pressure. At this time, a catch end (54) is configured so that the elastic fastening part (51) that is elastically connected to the upper outer surface of the body part (2) protrudes outward with a thickness or diameter larger than the thickness of the elastic fastening part (51) and prevents the elastic fastening part (51) from being peeled off from the body part (2) when the elastic variable part (52) is deformed in a state where the fixing means (8) is fastened to the outside of the elastic fastening part (51).

[0037] As shown in FIG. 4 or FIG. 5, the pressure reducing device (1) for a sewage pipe of the present invention configured as described above drains sewage and drainage from each floor of a building through a riser pipe (10) to a horizontal pipe (20) at the bottom, and as shown in FIG. 6, the drainage speed of the sewage slows down or is temporarily blocked in the horizontal pipe (20), causing a water hammer effect to occur due to the sewage that is subsequently drained, and as a result, positive pressure is generated in the elbow of the horizontal pipe (20) and rises to the riser pipe (10) in the opposite direction to the drainage direction, and at this time, as shown in FIG. 7, the positive pressure flows into the body (2) of the damping device (1) of the present invention, and the center portion of the elastic membrane (5) with a concave center inflates and expands into the expansion space (61) of the inner upper portion of the cover (6) that is fixedly joined to the body (2), thereby reducing the positive pressure.

[0038] In this way, even if wastewater and foreign substances flow into the body part (2) when positive pressure is introduced, the upper part of the body part (2) is blocked by a flexible membrane (5), and the lower part of the body part (2) is formed with a downward slant on the inside, and the wastewater falls through the drainage part (3) formed in the lower part of the body part (2) to the connecting pipe (12) connected to the joint part (4) at the lower part of the drainage part (3), and flows back into the inlet pipe (10) where the branch pipe (11) is installed, thereby preventing the inside of the damping device (1) from being contaminated or damaged.

[0039] In addition, the pressure reducing device (1) for a sewage pipe of the present invention generates negative pressure by siphon-age when passing through a horizontal pipe (30) from an inlet pipe (10) during drainage, or continuously generates negative pressure by a reaction at the elbow of the horizontal pipe (20) after the positive pressure is absorbed, and at this time, as shown in FIG. 8, the negative pressure is reduced as the elastic membrane (5) with a curved center inside the body (2) of the damping device (1) swells and expands into the expanded space (22) at the inner lower part of the body (2).

[0040] According to the pressure reducing device (1) for sewage pipes of the present invention, when sewage is drained, the device expands upward or downward in response to the positive pressure continuously generated in the elbow of the horizontal pipe (20) and the negative pressure generated in the horizontal pipe (30) of each generation or by the reaction of the positive pressure, thereby maximizing the efficiency of reducing the pressure generated in the entire sewage pipe.

[0041] In addition, the present invention has a structure in which a downwardly curved flexible membrane (5) is combined with a drum-shaped body (2) as shown in FIG. 4, compared to a conventional pressure-reducing device in which a cylindrical tube illustrated in a virtual line is inserted, and thus the device is manufactured in a simple and compact structure with a short vertical length, thereby maximizing the positive pressure reduction efficiency by increasing the suction amount when positive pressure is generated, and the space portion spaced apart from the body (2) at the bottom of the flexible membrane (5) expands downward when negative pressure is generated, thereby providing an excellent negative pressure relief function, thereby minimizing damage caused by the vibration of the seal installed at the end of the horizontal branch pipe (30), and has the effect of reducing the manufacturing cost and the installation cost by making it easy to install in a narrow space without requiring a separate support member, and as shown in FIG. 4, even if it is installed directly above the horizontal branch pipe (20), the structure is such that the sewage and foreign substances flowing back with the positive pressure are immediately discharged after suction, so that the horizontal branch pipe (20) can be installed close to the slab. It is easy to install the transverse pipe (20), and can more effectively absorb positive pressure near the transverse pipe (20). It has the effect of extending the product lifespan and doubling the operational reliability by improving durability and blocking the interference of the attenuation effect of positive and negative pressure.

[0042] As described above, the detailed description of the present invention has described the most preferred embodiment of the present invention, but various modifications are possible within a range that does not depart from the technical scope of the present invention, and therefore, the protection scope of the present invention is not limited to the above embodiment, but should be recognized as the protection scope including the technologies of the patent claims described below and equivalent technical means from these technologies.

[0043] The present invention is capable of automatically responding to changes in positive and negative pressure occurring in a sewage pipe to attenuate both positive and negative pressure, so that even if sewage flows backward, it does not remain inside the attenuation device but is automatically discharged immediately, thereby minimizing damage to the device and extending the product's lifespan, and thus has very high potential for industrial use.

Claims

1. A drum-shaped body part (2) configured such that an upper opening (21) is formed, a drainage part (3) is formed at the lower part with an inner surface of a downwardly sloping upper and lower side, and a connecting part (4) is integrally formed at the lower end of the drainage part (3) so that a connecting part (4) is formed to be connected to a connecting pipe (12) connected to a branch pipe (11) installed in a riser pipe (10); A stretchable membrane (5) configured to be elastically joined to the upper outer side of the body (2) to block the entire opening (21) and to be bent downward in the middle so as to be introduced into the interior of the body (2), so as to expand convexly upward when positive pressure generated in the elbow of the transverse main pipe (20) and then introduced through the inlet pipe (10) is introduced; A pressure reducing device for a sewage pipe, characterized in that it includes an expansion space (22) formed between a drainage section (3) at the lower part of a body section (2) and a downwardly curved expansion membrane (5) to accommodate the expanded expansion membrane (5) when the expansion membrane (5) is downwardly expanded by negative pressure.

2. In claim 1; A cover (6) configured to protect the elastic film (5) from the upper part of the elastic film (5) which is joined to the upper part of the body part (2) by having the lower part fixedly joined to the body part (2); An expansion space (61) formed to accommodate the expanded expansion membrane (5) when the expansion membrane (5) is expanded by positive pressure by being fixed and joined to the upper inner side of the cover (6) so as to be spaced apart from the upper side of the body (2); A pressure reducing device for a sewage pipe, characterized in that it includes an air inlet hole (62) formed through the inside and outside of the cover (6) so that air inside the cover (6) is discharged or outside air is introduced when the elastic film (5) on the upper side of the cover (6) expands or contracts to its original shape.

3. In claim 1; A fastening member (7) formed so as to protrude radially from the lower portion of the body (2) so that when the lower portion of the cover (6) is fastened and fixed with a fastening means (71) such as a rivet or a bolt and nut, the body (2) and the cover (6) are separated and combined to correspond to the horizontal expansion of the elastic film (5); An open hole (63) formed between the radially protruding fastening holes (7) at the lower part of the body (2) so that the air inside the cover (6) is discharged or external air is introduced when the elastic membrane (5) expands or contracts to its original shape in the internal expansion space (61); When the cover (6) is fixed to the fastening hole (7) of the body part (2) by a fastening means (71), several guide projections (64) are formed radially on the lower part of the cover (6) so that the through-hole of the cover (6) through which the rivet or bolt of the fastening means (71) passes and the through-hole of the fastening hole (7) correspond to each other; A pressure reducing device for a sewage pipe, characterized in that a guide groove (74) is formed on each of the support steps on which the lower part of the cover (6) is placed at the lower end of the vertical joint piece (73) of the fastener (7) corresponding to the guide projection (64) of the cover (6), so that when the guide projection (64) of the cover (6) and the guide groove (74) of the fastener (7) are correspondingly connected, the through hole of the cover (6) and the through hole of the fastener (7) are precisely aligned correspondingly.

4. In claim 1; A hemispherical upper insertion groove (32) open downwardly to the upper sealing portion (31) protruding downwardly from the lower portion of the drain portion (3) on the upper outer side of the joint portion (4) of the body portion (2); A hemispherical lower insertion groove (42) open upwardly to a lower sealing portion (41) formed to correspond to the upper sealing portion (31) and protruding outwardly at the upper end of a connecting pipe (12) that is connected to a joint (4); A pressure reducing device for a wastewater pipe, characterized by including a sealing ring (43) configured such that the upper and lower parts are forcibly joined to an upper insertion groove (32) formed in an upper sealing part (31) at the lower part of a drainage part (3) and a lower insertion groove (42) formed in a lower sealing part (41) at the upper part of a connecting pipe (12) to prevent wastewater from leaking.

5. In claim 1; An elastic fastening member (51) that is joined to the outer surface of the body part (2) on the outer edge of the elastic film (5) to have elasticity in the circumferential direction from top to bottom; A stretchable portion (52) formed so that the center of the inner edge of the elastic membrane (5) is bent downward toward the lower inner side of the body portion (2), and expands convexly upward when positive pressure is generated, and expands to bend more downward when negative pressure is generated; A pressure reducing device for a sewage pipe, characterized in that it includes a step portion (53) formed between an outer elastic connecting portion (51) and an inner elastic variable portion (52) of an elastic membrane (5) so as to be bent downward and inward, and configured so that the outer surface of the elastic variable portion (52) is spaced apart from the inner surface of the body portion (2).

6. In claim 5; A stretchable fastening member (51) that is stretchably connected to the upper part of the body part (2) is fastened to the outside and is configured to be pressurized so that the stretchable membrane (5) does not separate from the body part (2) when the elastic variable member (52) changes due to positive or negative pressure; a belt-shaped fixing means (8); A pressure reducing device for a sewage pipe, characterized in that a catch end (54) is provided at the lower end of an elastic fastening part (51) that is elastically connected to the upper outer surface of a body part (2) and is configured to protrude outwardly with a thickness or diameter greater than that of the elastic fastening part (51) and prevent the elastic fastening part (51) from being removed from the body part (2) when the elastic variable part (52) is deformed while a fixing means (8) is fastened to the outside of the elastic fastening part (51).

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