WO2008136597A2

WO2008136597A2 - Apparatus of reverse protection for sewerageline

Info

Publication number: WO2008136597A2
Application number: PCT/KR2008/002478
Authority: WO
Inventors: Jongsun Kim
Original assignee: Jongsun Kim
Priority date: 2007-05-03
Filing date: 2008-05-01
Publication date: 2008-11-13
Also published as: KR100827566B1; JP2010530484A; WO2008136597A3; KR20070058398A

Abstract

Disclosed is an apparatus of reverse protection for a sewerage line, which is installed at a basal sewer pipe connected to a collecting tank or a distal part of a trunk sewer pipe connected from the collecting tank to a drainage canal so as to prevent a reverse flow of sewerage from the collecting tank to the basal sewer pipe or from the trunk sewer pipe to the collecting tank. The apparatus is ultimately used in the distal part of the sewer pipe which is disposed at the collecting tank, the river, the sea, the public water and the like so as to smoothly perform the normal function of draining the sewerage.

Description

[DESCRIPTION]

.Invention Title]

APPARATUS OF REVERSE PROTECTION FOR SEWERAGE LINE [Technical Field] Document information for the related arts

Korean Utility Model Registration No 20-20-0239577 "Apparatus of reverse protection for sewer pipe"

Korean Patent No. 10-0543435 "Apparatus of reverse protection for sewerage" Korean Patent Application No. 10-2005-19914 (Patent Laid- Open Publication No 10-2006-0098176) "Apparatus of reverse protection for sewerage"

U.S. Patent 4 , 503 , 881 (Automatic counterbalanced sewer valve wxth closure) U.S. Patent 6,305,411 (NormalIy-open backwater valve)

The present invention relates to an apparatus of reverse protection for a sewerage line, which is installed at a basal sewer pipe connected to a collecting tank or a distal part of a trunk sewer pipe connected from the collecting tank to a drainage canal so as to prevent a reverse flow of sewerage from the collecting tank to the basal sewer pipe or from the trunk sewer pipe to the collecting tank.

Also, the present invention relates to an apparatus for reverse protection for a sewerage line, which is installed at a distal part of the sewerage line draining various sewerages to public water of a river or sea, etc. so as to prevent a reverse flow of sewerages, river water, and sea water to a drainage canal .

5 Also, the present invention relates to an apparatus for reverse protection for a sewerage line, which is installed at a distal part of a drainage canal or a sluice of a bank draining agricultural water from a farm waterway in the form of a pipe or an open channel to a river so as to prevent a

10 reverse flow of river water to the farm waterway when the water level of the river rises . [Background Art]

As is well-known in the art, facilities for treating various sewerages have a difference according to whether a

] T) drainage system is a separated type or a combined type, but are configured to collect the sewerage from a basal sewer pipe to a collecting tank or a main sewer pipe or a trunk sewer pipe and directly drain the sewerage to a river or sea, or to collect the sewerage in a sewerage treatment plant or a 0 sewerage treating facility and drain the sewerage to public water such as a river or sea, etc.

The basal sewer pipe or the main sewer pipe and the trunk sewer pipe installed in the sewerage treating facility has a proper specification to be able to sufficiently treat normal sewerage emissions expected at a corresponding facility or a place .

Therefore, the basal sewer pipe or the main sewer pipe and the trunk sewer pipe treat the sewerage in the form of an open type water channel having a free water surface in a normal sewerage emission state, but when inflow water is larger than treatment capacity (drainage capacity) of the sewer pipe due to temporary heavy rain or localized heavy rain at some areas, they are in the form of a pipeline emitting sewerage at a water full state without having the free water surface .

Therefore, the sewerage that are not drained to the corresponding sewer pipe overflows into a road or a ground surface and at the same time, flows backward to the basal sewer pipe positioned at a colline zone as a hydraulic pressure is raised, or flows backward from the trunk sewer pipe to the basal sewer pipe or the main sewer pipe positioned at other colline zone, thereby leading to a flooded damage.

Also, when the water level of the trunk sewer pipe or the river is raised by heavy rain or localized torrential downpour at some areas, the water level of a river is raised by rainy spell and the sea level is raisied, etc., a phenomenon that the sewerage, the river water, or the sea water flows backward to the drainage canal or the trunk sewer pipe positioned at the colline zone and a farm waterway of an irrigation canal occurs, thereby leading to a fooled damage.

As related arts to prevent the flooded damage due to the reverse flow of the sewerage, the river water, and the sea water, there are Korean Utility Model Registration No.20-20- 0239577, entitled "Apparatus of reverse protection for sewer pipe" (hereinafter, referred to as a related art 1) ; Korean Patent No. 10-0543435, entitled "Apparatus of reverse protection for sewerage" (hereinafter, referred to as a related art 2); Korean Patent Laid-Open Publication No. 10- 2006-0098176, entitled "Apparatus of reverse protection for sewerage" (hereinafter, referred to as a related art 3); U.S. Patent 4,503,881, entitled "Automatic counterbalanced sewer valve with closure" (hereinafter, referred to as a related art 4); and U.S. Patent 6,305,411, entitled "Normally-open backwater valve" (hereinafter, referred to as a related art 5) , etc. However, these related arts have many problems in view of use characteristics, productivity, performance and quality.

For example, the related art 1 is configured to interpose a floating spherical open-and-close ball between upper and lower drainage holes of a cylindrical pipe type main body of a reverse flow preventing device. When discharging sewerage, the open-and-close ball floats to open the lower drainage hole, thereby discharging the sewerage and when the sewerage flows backward from the sewer pipe, the open-and-close ball floats to close the upper drainage hole, thereby closing the reverse flow of the sewerage to an indoor side.

The related art 1 configured as described above can be used only in a vertical sewerage line among various sewerage lines and cannot be installed at a horizontal sewerage lines. Also, since the related art 1 has the open-and-close ball installed at a drainage passage within the main body, it makes a drainage cross section of the drain passage narrow, thereby hindering a flow of drainage. As a result, the related art has a disadvantage that it is difficult to smoothly discharge the sewerage and foreign materials with large volume.

The configurations of the related arts 2 and 3 include a cylindrical body having an assembling upper plate as a main body, a vertical sewerage inlet pipe installed at a center of the upper plate, a horizontal sewerage outlet hole formed at one side wall of the cylindrical body, and a spherical floating body provided within the cylindrical body and having a larger diameter than an inlet hole. At the side of the outlet hole, there is provided a blocking wall that blocks movement of the spherical floating body to the outlet hole, and at the other side opposite thereto, there is provided with a guide plate that guides the floating body to the center of the inlet hole. In the configurations of the related arts 2 and 3 as described above, when the sewerage is discharged, the sewerage with a head force is flowed into the inside of the cylindrical body through the inlet hole and discharged through the outlet hole formed at one side of the cylindrical body.

At this time, the spherical floating body is positioned at one side of the cylindrical body in a floating state controlled by self-weight and head force of the sewerage headed to the inside of the cylindrical body through the inlet hole and at the same time, is rotated by the headed sewerage, so that its surface is automatically cleaned.

Also, when the sewerage flows backward from the side of the outlet hole to the inside of the cylindrical body, as the sewerage flowed backward to the inside of the cylindrical body is filled, the spherical floating body is floated by its buoyancy so that it is primarily guided to the guide plate so as to be floated toward the lower side of the inlet hole, and closely attached to a lower end of the inlet hole, thereby preventing the reverse flow of the sewerage to the upper side of the inlet hole.

The configurations of the related arts 2 and 3 complement the disadvantage of the sewerage discharge in the related art 1. That is, the related arts 2 and 3 are configured to allow the spherical floating body to be positioned at one side of the drainage passage to smoothly discharge the sewerage even when the sewerage flowing in the cylindrical body through the sewerage inlet hole includes various foreign materials.

Also, when the reverse phenomenon of the sewerage is defused, the spherical floating body is rapidly dropped to open the drainage pipe according to the water level, and also the related arts can be used for the horizontal sewerage line.

The configurations of the related arts 3 and 3 can be installed at the horizontal sewerage line. However, since central axial lines of the sewerage inlet hole and outlet hole should have a step with a predetermined height up and down, the configurations of the related arts 2 and 3 are barely applied to a general horizontal sewerage line formed to have a single straight axial line. Also, since the drainage passage within the main body of the reverse preventing device is formed by a double-curved type, not a horizontal straight type and the spherical floating body can not be completely removed from the drainage passage, it is impossible to form a full open type drainage passage.

Also, when the related arts 2 and 3 are applied to a large-capacity specification, since the diameter and height of the cylindrical body and the diameter of the spherical floating body are increased accordingly, it is very difficult to fabricate their molds and parts, and also since the horizontal step between the sewerage inlet pipe and outlet pipe are increased accordingly, it is more difficult to apply to the horizontal sewerage pipe.

5 The configurations of the related arts 4 and 5 improve some of the disadvantages of the related arts 2 and 3 , such that they can dispose the sewerage inlet pipe and the sewerage outlet pipe on the horizontal central axial line of the single straight line type.

H) However, in the related art 4, since an apparatus of reverse protection for sewerages has a complicated structure including a plate type check valve, a spherical floating body and an operating rod, it has disadvantages of low productivity and high manufacturing cost.

I^1") In particular, the related art is configured to rotate the plate type check valve up and down within the sewerage outlet pipe to block the sewerage line, foreign materials may be easily caught or sandwiched between an open-and-close part of the valve and a seat, thereby increasing a defect

20 occurrence rate of a malfunction or an operation inability of the reverse protection.

Also, the related art 5 has a simple configuration in which the spherical floating body is disposed at the side of the sewerage outlet hole and the check valve is disposed at the side of the sewerage inlet hole with respect to a seesaw type operating body which can be freely rotated by a rotational shaft provided at its central part, but also has a disadvantage that the drainage passage cannot be formed into a full open type, the reverse blocking responsive ability is slow, and it is difficult to apply to a large-capacity specification.

The related arts as described above are apparatuses of reverse protection for a sewer pipe installed at a middle part or a distal part of the basal sewer pipe or the main sewer pipe and the trunk sewer pipe having a cylindrical cross section, while the farm waterway or the sewerage line sluice of the sewerage treating facility is provided with a so-called non-powered automatic water gate valve having a function of reverse protection for the river water or the sea water.

A kind of the non-powered automatic water gate valve is various, but the valve has a common feature having a function of reverse protection that opens and closes the sewerage line automatically corresponding to a drainage state operated to the sewerage line and a reverse state of the river water and the sea water, as compared to a lock type water gate valve that forcibly opens and closes the drainage line by slidably moving a plate type water gate valve in a vertical direction by manual or electricity. FIGs. 19 to 20 show a most common and representative configuration of the non-powered automatic water gate valve, wherein it shows a configuration and a use state of a swing- type non-powered automatic water gate valve 50 used for a farm waterway water gate 42 as an example.

The non-powered automatic water gate valve 50 is installed at the farm waterway water gate 42 that is formed at a bank 40 built between a farmland 30 and a river 43 to have a predetermined height. The farm waterway water gate 42 is generally provided with an approximate circular or square cross sectional drainage pipe 34 of which one end is connected to a farm waterway pipe 32 of the farmland 30 and the other end penetrates through the bank 40 in a horizontal direction and has a tip end formed into a tilted distal part 35.

The non-powered automatic water gate valve 50 includes the titled distal part 35 of the drainage pipe 34 used as a valve seat member, a circular plate or square plate type valve disk 52 manufactured by a casting or a steel structure to have a predetermined weight, a packing 54 provided at an the inner surface of the valve disk 52 to be closely attached to an outer side end of the tilted distal part 35, and a hinge 58 which fixes an upper and of the valve disk 52 to a wall through a hinge bar 56. The valve disk 52 can be freely pivoted by hinge 58 and the hinge bar 56.

In the non-powered automatic water gate valve 50 configured as described above, the valve disk 52 is closely- attached to the outer side end of the distal end 35 of the drainage pipe 34 by its own weight at normal state, and when the sewerage such as agricultural water or rain water are discharged through the drainage pipe 34, a lower end of the valve disk 52 is lifted up by a pressure of the discharged water with a pin shaft of the hinge 58 in the center, so that the valve disk 52 is opened.

However, when the water level of the river 43 is beyond an installation position of the drainage pipe 34, the water pressure of the river water presses the outer surface of the valve disk 52 to close the tilted distal end 35 of the drainage pipe 34, so that the automatic reverse protection function of blocking the reverse flow of the river water to the farm waterway pipe 32 is operated.

The non-powered automatic water gate valve 50 having an operation effect as described above is automatically opened and closed according to the water level of the farm waterway pipe and the water level of the river, and thus it performs the drainage function for the agricultural water or the rainwater of the farmland and the reverse protection function of the river water. However, the non-powered automatic water gate valve 50 is not a full open and close type allowing the drainage passage to use the overall sectional area even when using the drainage pipe with the large diameter, but is a partial open and close T) type partially opening the drainage pipe 34 by lifting up the lower end of the valve disk 52 in proportion to the sewerage pressure discharged from the farm waterway pipe while the tilted distal end 35 of the drainage pipe 34 is always closed by the heavy-weighted valve disk 52.

10 Therefore, when the water level of the farm waterway pipe is rapidly increased by a large amount of rainwater inflowed from the peripheral farmland by the localized torrential downpour, the rainwater can not be rapidly drained, and thus the farmland is flooded and the flooded state is sustained for if) a long time .

Also, when foreign materials such as branches, vinyl, textiles keeping warm for vinyl house, and crops waste with large volume are mixed in the sewerage, it is difficult to smoothly discharge the sewerage, and when the river water 0 flows backward, it is impossible to perform the reverse protection operation by foreign materials caught or sandwiched between the titled distal end 35 with a small gap formed in the course of discharging the foreign materials and the packing 54 of the valve disk 52. [Disclosure]

[Technical Problem]

The present invention proposes to solve the problems of the conventional apparatuses of reverse protection for sewerages. One object of the present invention provides an apparatus of reverse protection for a sewerage line, which is capable of disposing an inlet pipe and an outlet pipe at a distal end of a horizontal sewerage line on the same straight central shaft line. Another object of the present invention provides an apparatus of reverse protection for a sewerage line having high drainage ability, which secures a drainage pipe having the same diameter as inner diameters of the inlet pipe and outlet pipe in a normal sewerage discharging state to be capable of rapidly draining various foreign materials without clogging of the sewer pipe.

Another object of the present invention provides an apparatus of reverse protection for a sewerage line, which has an extremely simple structure, high productivity, low manufacturing cost, application easiness from a small size to a large size, high quality almost no malfunction, and high extensibility.

Another object of the present invention provides an apparatus of reverse protection for a sewerage line, which is capable of largely shortening flooded time by certainly- performing a function of reverse protection with rapid and high sealabilty in a reverse state of sewerage, and rapidly and completely opening a drainage passage in a state that the reverse flow of sewerage is defused.

Other objects can be understood from the following description.

[Technical Solution]

In order to achieve the present invention, a configuration of an apparatus of reverse protection for a sewerage line of the present invention comprises: a valve main body formed of a horizontal pipe body with a cylindrical cross section or a square cross section, one end of the valve body being formed into a sewerage inlet pipe and the other end thereof being formed into a sewerage outlet pipe on the same horizontal central shaft line; a check valve front end landing part formed by a boundary end of a through hole, the through hole being formed by downwardly cutting an lower-side inner wall of a horizontal central shaft line from a middle part of the valve body toward the sewerage outlet pipe so as to form a straight tilted surface in a cross section; a check valve rear end landing part formed by cutting a part of a circumference of an outer wall part of the sewerage inlet pipe of the valve body in a predetermined thickness to receive landing and operating space of the check valve rear end part, following the through hole forming the check valve front end landing part of the sewerage outlet pipe; a check valve hinge member having a bearing member for longitudinally rotatably supporting left and right rotating members of the check valve, an inner side thereof being provided with a check valve rotating space part inserted with the left and right rotating members of the check valve toward the upper of the check valve rear end landing part with respect to left and right outer wall middle parts of the sewerage inlet pipe of the valve main body; a check valve of which an outer circumference of an front end member is overlapped in a predetermined width and closely inscribed with an inner side of the check valve front end landing part of the sewerage outlet pipe, a cross section of the front end member is formed into a tilted connection end which is closely contacted with an upper end of an inner wall of the sewerage inlet pipe upon upward rotation, an inner surface of a rear end part is formed into a spherical surface which is inscribed with a rear border line of the through hole part at one side of a middle part thereof, a rear end is formed to be adjacently circumscribed with the check valve rear end landing part of the sewerage inlet pipe in a landing state, and an upper end is formed into left and right rotational members which are inserted into the check valve hinge member of the sewerage inlet pipe, so that the check valve functions as a lower wall body for blocking a lower T) through hole part of the sewerage outlet pipe in the landing state so as to be penetrated onto the same surface as the inner surface of the sewerage inlet pipe and functions as an opening/closing body for opening and closing between the sewerage inlet pipe and the sewerage outlet pipe in an upward

10 rotated state; a spherical floating body which has a cross section shape that can go in and out the through hole part forming the check valve front end landing part of the sewerage outlet pipe at a bottom surface of the front end of the check valve and also i5 has buoyancy that can lift up the check valve to an upper side of the sewerage outlet pipe in response to the reversed sewerage incoming to a detecting pipe body to closely contact the tilted connecting end of the check valve to an inner wall of the sewerage inlet pipe,- 0 the detecting pipe body which is fixed to the lower end of the valve body, functions as a cover member for hermetically covering the check valve front end landing part, the check valve rear end landing part and the hinge members from an outside, secures receiving and operating space of the spherical floating body and the rear end of the check valve, and is integrally provided with a reverse detecting pipe which is perpendicularly connected with a lower front part of the sewerage pipe . In the configuration of the present invention, a packing member is interposed at a front end tilt connecting end of the check valve to increase adhesion with an inner wall of the sewerage inlet pipe or the sewerage outlet pipe.

In the configuration of the present invention, a packing member is interposed at the inner surface of the middle of the check valve to prevent a flow of the discharged sewerage to a hinge member by increasing the adhesion with a rear border end of the through hole part .

In the configuration of the present invention, an upper seat member of a smaller inner diameter having a step enough to receive a thickness of the check valve than an inner diameter of the sewerage inlet diameter with respect to a part that the front end tilted connection end of the check valve is closely attached upwardly is included m the valve body with respect to the border part of the sewerage inlet pipe and the sewerage outlet pipe.

In the configuration of the present invention, a lower seat member of a smaller inner diameter having a predetermined step at a border part of the sewerage inlet pipe of the through hole part to receive a thickness of the check valve at a circumference of an inner wall of the sewerage outlet pipe is included in the valve body with respect to the inner wall part of the sewerage inlet pipe of the valve body. f) In the configuration of the present invention, it is preferred that the upper seat member is partitioned by a straight tilted surface in a cross section, which is formed at an angle of at least 15-40° upwardly toward the sewerage outlet pipe, so as to increase productivity of the valve main

!0 body and the check valve and the shape stability of the check valve, and also to form a proper height of the detecting pipe body.

As the angle of the straight tilted surface of the upper seat member in a cross section is increased, the length of

IT) cross section of the upper seat and the check valve becomes short, but the rotational trace that the check valve is contacted with the upper seat becomes long, and the length of the rear end member of the check valve becomes long.

Further, as the angle of the straight tilted surface of 0 the upper seat member in a cross section is reduced, the length of cross section of the upper seat and the check valve becomes long, but the rotational trace that the check valve is contacted with the upper seat becomes short, and the length of the rear end member of the check valve becomes short. As described above, the angle of the straight tilted surface of the upper seat member in a cross section functions as a setting function for the length of the check valve and the rotational trace and the height of the detecting pipe body T) for receiving the rear end member of the check valve. Therefore, it is preferable that the angle is set to 20-30° for the stability and durability of the shape of the check valve and the stability of the rotational operation of the check valve, and also it is possible to properly form the

K) height of the detecting pipe body so as to be not larger than the diameter of the sewerage outlet pipe.

Further, it is preferred that the lower seat member is partitioned by a straight tilted surface in a cross section, which is formed at an angle of at least 80-60° upwardly toward

15 the sewerage outlet pipe, so as to increase productivity and dimensional stability of the valve main body, the check valve and the lower seat and the shape stability of the check valve, and also to increase the adhesion and operational stability between the lower seat member and the inner surface of the 0 check valve .

The upper seat member may be provided with a packing member for increasing the adhesion with the tilted connection end of the check valve and thus increasing a blocking efficiency of the reversed sewerage. The lower seat member may be provided with a packing member for increasing the adhesion with the middle member of the check valve and thus preventing the discharged sewerage from being introduced to the hinge member.

5 The spherical floating member which is integrally attached to the bottom surface of the check valve may be formed of a hollow housing having a cross section shape and other materials having high buoyancy.

The rear end part of the check valve may further comprise 10 a heavy weight for increasing rotational buoyancy when the sewerage is flowed backward.

A packing member for increasing adhesion and thus preventing foreign materials from being introduced to the hinge member may be interposed at the lower end part of the

IT) valve main body and the assembling contact part of the detecting pipe body.

The flanges as a means for securing assembility, diassembility and assembling strength, which are respectively contacted up and down with left and right outer ends of a 0 central axial line of the valve main body and an upper end of the detecting pipe body and then fixed by a fastening means of bolts and nuts, may be provided at the lower end of the valve main body and the assembling part of the detecting pipe body.

A reverse detecting opening provided at the front end of the detecting pipe body may be formed of a cylindrical body, a semi-cylindrical body or a rectangular tube body. a packing member, which is closely contacted with an circumference of the rear end of the check valve when the 5 rotation of the check valve is finished so as to prevent the reversed sewerage from being introduced to the hinge member, may be interposed at an inner rear part of the detecting pipe body.

The lower drainage pipe and the sewerage inlet pipe of iO the valve body may further comprise a flange type or screw type fastening member for connection with the sewer pipe.

The lower wall of the detecting pipe body may be formed into a downward tilted type for draining the reversed sewerage and smoothly discharging the foreign materials.

! .)

[Advantageous Effects]

The apparatus of reverse protection for the sewerage line according to an embodiment of the present invention, as described above, is horizontally installed to a distal part of 0 the sewer pipe connected to the collecting tank, the main sewer pipe and the trunk sewer pipe, or a distal part of the sewerage line of the farm waterway water gate or the sewer pipe horizontally arranged cross a bank for river or sea.

The sewerage inlet pipe as the front side of the valve main body is connected with the distal part of the existing sewerage line, and the sewerage outlet pipe and the reverse detecting body as the rear side are perpendicularly disposed up and down to be connected with the sewerage discharging 5 place .

According to the installation state, in normal state, the circumference of the front end part of the check valve is inscribed with the check valve front end landing part of the sewerage outlet pipe by its own weight, and the inner surface 10 of the middle member is closely contacted with the rear side of the through hole part, thereby blocking the through hole part .

Therefore, the check valve functions as a blocking body for blocking through hole part of the sewerage outlet pipe, IT) and thus forms a complete open type drainage passage in which the sewerage inlet pipe and the sewerage outlet pipe have the same cross sectional area on the same axial line. Therefore, the apparatus of reverse protection for the sewerage is used as a distal member of the normal sewer pipe for smoothly 0 draining the sewerage introduced from the sewerage inlet pipe to the sewerage outlet pipe, like in a typical single pipe type sewer pipe .

In the normal operation state, if the water level of the collecting tank or the drainage canal or the river or sea is increased, the reverse sewerage is flowed backward to the detecting pipe body through the reverse detecting pipe and thus the spherical floating body receives the buoyancy.

If the spherical floating body receives the buoyancy, the front end of the check valve is gradually pivoted upward about a bearing point of the rotational member in response to the buoyancy so as to open and close the drainage passage of the valve main body. If the water level of the reverse sewerage or sea water arrives at the upper end of the sewerage outlet pipe, the buoyancy of the spherical floating body becomes maximum so that the tilted connection end of the check valve is forcibly contacted with the inner wall of the sewerage inlet pipe or the upper seat member.

If the tilted connection end of the check valve is forcibly contacted with the inner wall of the sewerage inlet pipe or the upper seat member, the drainage passage between the sewerage inlet pipe and the sewerage outlet pipe is completely blocked. Therefore, even though the water level of the reverse sewerage at the sewerage outlet pipe is further increased, the reverse flow of the sewerage or sea water to the sewerage inlet pipe is completely blocked.

In the reverse protection state, if the water level of the collecting tank or the drainage canal or the river or sea is lowered below the height of the sewerage outlet pipe or the detecting pipe body, the spherical floating body is descended in proportion to the lowered water level, and the check valve is also descended, and the inner drainage passage of the valve main body is gradually opened. Thus, the apparatus of reverse 5 protection for the sewerage line functions as the distal member of the sewer pipe.

According to the apparatus of reverse protection for the sewerage line as described above, it is horizontally installed to the distal part of the existing sewerage line. In normal

10 sate, it is used as the complete open type drainage passage for draining the sewerage, and if the reverse flow is occurred due to the increased water level, the check valve is automatically and rapidly pivoted upward so as to open and close the drainage passage of the valve main body, thereby

!T) automatically preventing the reverse flow of the sewerage or the sea water to the sewerage inlet pipe.

[Description of Drawings]

The above and other objects, features and advantages of 0 the present invention will become apparent from the following description of preferred embodiments given in conjunction with the accompanying drawings, in which:

FIG. 1 is a side view of an apparatus of reverse protection for a sewerage line according to an embodiment of the present invention.

FIG. 2 is a rear view of the apparatus of reverse protection for the sewerage line according to the embodiment of the present invention. FIG. 3 is a side view of a valve body of the apparatus of reverse protection for the sewerage line according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view taken along a line A-A of FIG. 3. FIG. 5 is a cross-sectional view taken along a line B-B of FIG. 2.

FIG. 6 is a cross-sectional view taken along a line C-C of FIG. 5.

FIG. 7 is a cross-sectional view taken along a line D-D of FIG. 5.

FIG. 8 is a side view showing an operating state of the apparatus of reverse protection for a sewerage line according to the embodiment of the present invention.

FIG. 9 is a cross -sectional view of an apparatus of reverse protection for a sewerage line according to another embodiment of the present invention.

FIG. 10 is a cross-sectional view showing an operating state of the apparatus of reverse protection for a sewerage line of FIG. 9. FIG. 11 is a cross sectional view showing a state that the apparatus of reverse protection for the sewerage line is installed at a collecting tank according to an embodiment of the present invention. FIG. 12 is other cross sectional view showing the state that the apparatus of reverse protection for the sewerage line is installed at the collecting tank in FIG. 11.

FIG. 13 is a cross-sectional view showing an operating state of a reverse protection function of the apparatus of reverse protection for the sewerage line installed at the collecting tank.

FIG. 14 is a cross-sectional view showing an installation state of a drainage canal of the apparatus of reverse protection for the sewerage line according to the embodiment of the present invention.

FIG. 15 is a cross-sectional view showing an operating state of a reverse protection function in the drainage canal of the apparatus of reverse protection for the sewerage line according to the embodiment of the present invention. FIG. 16 is a cross-sectional view showing a state that the apparatus of reverse protection for the sewerage line is installed at a farm waterway water gate according to the embodiment of the present invention.

FIG. 17 is a cross-sectional view showing an operating state of a reverse protection function in the apparatus of reverse protection for the sewerage line installed at a farm waterway water gate according to the embodiment of the present invention .

") FIG. 18 is a side view of an apparatus of reverse protection for a sewerage line according to yet another embodiment of the present invention.

FIG. 19 is a cross-sectional view showing an installation state of a conventional non-powered automatic water gate valve. H) FIG. 20 is an enlarged cross-sectional view showing the installation state of the conventional non-powered automatic water gate valve .

[Detailed Description of Main Elements]

30: farmland 11 32: farm waterway pipe

34 : cross sectional drainage pipe

35: tilted distal part

40 : bank

42: farm waterway water gate 0 43 : river

50: valve disk

56 : hinge bar 58 : hinge

60: collecting tank 61: inner wall of collecting tank

70: basal sewer pipe

80: trunk sewer pipe

100: an apparatus of reverse protection for a sewerage 5 line according to an embodiment of the present invention

100a: an apparatus of reverse protection for a sewerage line according to another embodiment of the present invention

100b: an apparatus of reverse protection for a sewerage 10 line according to yet another embodiment of the present invention

101: valve body

104 : check valve

106: spherical floating body ] r> 104a: check valve according to another embodiment of the present invention

106a: spherical floating body according to another embodiment of the present invention

108: detecting pipe body 0 110: sewerage inlet pipe

111: sewer pipe connecting flange

112 : upper seat member

112a: upper packing groove

112b: T-shaped groove 113 : lower seat member 113a: lower packing groove 114 : check valve rear end landing part 115, 115a: left and right rotation groove F) 116, 116a: left and right hinge member 117: rotational shaft hole 118 : rotational shaft pin 119: bushing

120: sewerage outlet pipe K) 122: through hole part

123 : check valve front end landing part

130, 130a: left and right horizontal fixing flange

132: upper packing

133: lower packing

If) 134: main body packing

135: bolt

136: bolt hole

141: front end member

141a: tilted connection end 0 142: rear end member

142a: extended rear end member 143, 143a: right rotational member 145: shaft hole

181: reverse detecting pipe 182, 182a: left and right fixing flange

183 : bolt hole

185: detecting pipe packing

186: extended rear detecting pipe b 187: packing pressure member

188: outer tilted part

190: heavy weight

[Best Mode]

10 Hereinafter, preferred embodiments of the present invention will be described in more detail.

FIGs. 1 to 7 show a configuration of an apparatus 100 of reverse protection for a sewerage line according to one embodiment of the present invention.

IT) The apparatus of reverse protection for the sewerage line 100 according to the present invention includes a valve body 101, a check valve 104, a spherical floating body 106, and a detecting pipe body 108 as main components.

The valve body 101 is formed by a horizontal single pipe 0 body with a cylindrical cross section, and on the same horizontal central shaft line, one side of the valve body 101 forms a sewerage inlet pipe 110 and the other side forms a sewerage outlet pipe 120 which has a larger specification than an inner diameter of the sewerage inlet pipe 110 so as to receive a member thickness of the check valve 104.

An inner wall of the sewerage inlet pipe 110 is provided with an oval linear upper seat member 112 that is partitioned by a straight tilted surface in a cross section, which is formed at an angle of 26° upwardly toward the sewerage outlet pipe 120, with respect to an upper inner wall part of a horizontal central axial line from an approximate middle part.

An upper packing groove 112a having a predetermined step to receive the member thickness of the check valve 104 is provided between a circumference of an outer wall of the upper seat member 112 and an inner diameter of the sewerage outlet pipe 120.

Also, the inner wall of the sewerage inlet pipe 110 is provided with an oval linear lower seat member 113 that is partitioned by a straight tilted line in a cross section, which is contacted with an inner surface of the check valve 104 completely rotated from an approximate starting point of the upper seat member 112 toward the sewerage outlet pipe 120, with respect to a lower inner wall of the horizontal central axial line, and the lower seat member 113 has a predetermined step difference from the inner diameter of the sewerage outlet pipe 120 so as to receive a member thickness of the check valve 104.

The cross section of the lower seat member 113 is formed with a lower packing groove 113a.

An inner wall of the sewerage outlet pipe 120 is formed with a check valve front end landing part 123 which is formed by cutting away a lower side from a similar oval linear, that is symmetrical with the upper seat member 112 about the horizontal central axial line, to the end of the lower seat member 113 so as to form a through hole part 122, and thus the check valve front end landing part 123 is symmetrical with the upper seat member 112 about the horizontal central axial line. Also, a lower outer wall part of the sewerage inlet pipe 110 is formed with a check valve rear end landing part 114 having a predetermined thickness, which is formed by cutting a part of the outer wall at a rear side of the lower seat member 113 together with the cut-away part forming the check valve front end landing part 123 so as to receive the landing of a rear end member 142 of the check valve 104 and a operation space .

Also, at upper left and right sides of the check valve rear end landing part 114 of the sewerage inlet pipe 110, there are formed left and right rotation grooves 115 and 115a which are formed by cutting away inner sides of upper left and right sides of the check valve rear end landing part 114 from upper sides of the outer wall of the rear side of the lower seat member 113 to an extended line of the upper seat member 112 so that left and right rotational members 143 and 143a can be inserted therein. And outer walls of the left and right rotation grooves 115 and 115a are used as hinge members 116 and 116a having a predetermined height.

5 Rotational shaft holes 117 are formed at the left and right hinge members 116 and 116a in a transverse direction, and the left and right rotational members 143 and 143a of the check valve 104 are respectively inserted into the left and right rotation grooves 115 and 115a, and also a rotational

H) shaft pin 118 and a bushing 119 are provided at each of the left and right sides so that the check valve can be freely pivoted.

The left and right outer surfaces of the valve body 101 are respectively provided with left and right horizontal

] f) fixing flanges 130 and 130a as a means for fixing the detecting pipe body 108, which are provided at an upper side of the horizontal central axial line to have a predetermined longitudinal length. The left and right horizontal fixing flanges 130 and 130a are formed with a plurality of bolt holes 0 136 so as to be integrally fastened to the valve body 101 by a plurality of bolts.

A middle part of the check valve 104 has the same inner diameter as the sewerage inlet pipe 110. The check valve 104 is served as a lower wall body that blocks the lower through hole part 122 m a landing state so that it is configured of a semi -cylindrical body to be penetrated onto the same surface as the inner surface of the sewerage inlet pipe 110.

A front end member 141 of the check valve 104 includes a 5 semi -oval-shaped tilted connection end 141a that is closely attached to the upper seat member 112. An outer circumference of the front end member 141 is formed to be closely overlapped and inscribed with an inner circumference of the check valve front end landing part 123 of the sewerage outlet pipe 120 m

H) a predetermined width.

A rear end member 142 of the check valve 104 is formed to be adjacently circumscribed with the check valve rear end landing part 114 of the sewerage inlet pipe 110 in a landing state, and an inner surface of the rear end member 142 is π formed into a spherical shape which is conjoined with the lower seat member 113 on a rotational trace to be apart from each other at a predetermined distance.

An upper end member of the check valve 104 is configured of left and right rotating members 143 and 143a that can be

20 movably inserted into each of the left and right rotating grooves 115 and 115a formed at the inner sides of the left and right hinge members 116 and 116a. The upper end member is formed with a shaft hole 145 in which the rotating shaft pin 118 and the bushing 119 are inserted. The spherical floating body 106 is attached to a bottom surface of the middle part of the check valve 104 and configured of a hollow housing having a cross section shape that can go in and out the through hole part 122 forming the check valve front end landing part 123 of the sewerage outlet pipe 120. The spherical floating body 106 has buoyancy that can lift up the check valve 104 upwardly inside the sewerage outlet pipe 120 in response to the reversed sewerage incoming to the detecting pipe body 108 to closely contact the tilted connecting end 141a of the check valve 104 to the upper seat member 112 of the sewerage inlet pipe 110.

The detecting pipe body 108, which is fixed to the lower end of the valve body 101, is provided with a cover member that receives the check valve front end landing part 123, the check valve rear end landing part 114, the hinge members 116 and 116a, the check valve 104 and the spherical floating body 106 and secures the operation spaces thereof so that they can be isolated from the outside. And the detecting pipe body 108 is also provided with a reverse detecting pipe 181 which is perpendicularly connected with the lower front part of the sewerage pipe 120.

Left and right upper end part of the detecting pipe body 108 are provided with left and right fixing flanges 182 and 182a which are respectively contacted with lower surfaces of the left and right horizontal fixing flanges 130 and 130a and then fastened by bolts 135. The left and right fixing flanges 182 and 182a are respectively formed with a plurality bolt holes 183 for fastening the bolts 135. The upper seat member 112 formed at the inner wall of the sewerage inlet pipe 110 is provided with an upper packing 132 which is used as a means for increasing adhesion with the tilted connection end 141a of the check valve 104, and the upper packing 132 is formed of an elastic material and fixedly inserted into the upper packing groove 112a.

The lower seat member 113 formed at the inner wall of the sewerage inlet pipe 110 is configured so that a lower packing 133 made of an elastic material is fitted in the lower packing groove 113a to seal a gap between an inner surface of the middle member of the check valve 104 and an inner surface of the rear end member 142 thereof.

A packing groove 131 for sealing a contact portion with the detecting pipe body 108 is formed at the lower surfaces of the left and right horizontal fixing flanges 130 and 130a and the lower outer circumference of the valve body 101 covered by the detecting pipe body 108, and a main body packing 134 is installed at the packing groove 131.

The inside of the detecting pipe body 108 is provided with a detecting pipe packing 185 made of an elastic material that is closely contacted with the outer end circumference of the rear end member 142 of the check valve 104 at the time of the rotation completion of the check value 104 to block the reverse flow of the sewerage to an outer surface space formed 1 at the lower outer end of the sewerage inlet pipe 110.

A reference numeral 111 which is not explained is a sewer pipe connection flange, and a reference numeral 112b is T- shaped groove formed at both distal ends of the upper packing groove 112a to fixing the upper packing 132.

H) An operation effect of the apparatus 100 of reverse protection for the sewerage line according to one embodiment of the present invention, as described above, will be described with reference of the drawings showing the operation states thereof .

IT) FIGs. 11 to 13 show operation states which the apparatus 100 of reverse protection for the sewerage line according to one embodiment of the present invention is installed to a collecting tank 60.

A plurality of basal sewer pipes 70 are horizontally

20 installed at an inner wall 61 of the collecting tank 60 in order to drain rain or sewerage discharged from houses or roads to a main sewer pipe or a trunk sewer pipe, and the basal sewer pipes 70 are disposed to be positioned at a higher place than a middle height of the inner wall 61 of the collecting tank 60.

The apparatus 100 of reverse protection for the sewerage line is horizontally connected with a distal part of each basal sewer pipe 70 disposed at the higher place than the middle height of the inner wall 61 of the collecting tank 60.

The apparatus 100 of reverse protection for the sewerage line may be connected with the distal part of the basal sewer pipe 70 so that a main body valve is exposed to the inside of the collecting tank 60, as shown in a right side of FIG. 12, or may be connected with the distal part of the basal sewer pipe 70 so that a front end of the sewerage outlet pipe 120 is set to the inner wall 61 of the collecting tank 60.

The sewerage inlet pipe 110 as a front part of the apparatus 100 of reverse protection for the sewerage line is horizontally connected with the distal part of the basal sewer pipe 70, and the sewerage outlet pipe 120 as a rear part thereof and the reverse detecting pipe 181 of the detecting pipe body 108 are positioned on an up/down perpendicular line to be directed to the inside of the collecting tank 60. According to the installation states as described above, in normal state, the outer surface of the front end member 141 of the check valve 104 is inscribed with the inner surface of the check valve front end landing part 123 by its own weight of the check valve 104, and a part of the inner surface of the middle member is closely contacted with the lower packing 133 of the lower seat member 113 of the sewerage inlet pipe 110.

Further, the rear end member 142 of the check valve 104 is settled to be apart from the circumference of the check ) valve rear end landing part 114, which is a middle outer wall of the sewerage inlet pipe 110, at a predetermined distance, so that the middle member of the check valve 104 blocks the through hole part 122 formed at the lower side of the sewerage outlet pipe 120.

H) Therefore, the check valve 104 is served as a blocking pipe body for blocking the through hole part 122 of the sewerage outlet pipe 120, and thus the valve main body 101 is formed into a complete open type in which the sewerage inlet pipe 110 and the sewerage outlet pipe 120 forming a drainage

15 passage of the main body valve 101 have the same cross sectional area on the same axial line.

Accordingly, if the sewerage is introduced from the basal sewer pipe 70 to the sewerage inlet pipe 110, the apparatus 100 of reverse protection for the sewerage line functions as a

20 distal member of the basal sewer pipe 70, which normally drains the sewerage to the sewerage outlet pipe 120 through the inner drainage passage in the valve main body 101 having the same inner diameter as the basal sewer pipe 70.

In the normal operation state as described above, if the sewerage (including the sea water) is flowed backward to the main sewer pipe 62, which is horizontally disposed at the lower end of the inner wall 61 of the collecting tank 60, due to the flood of the trunk sewer pipe or the river, or the raising of the water level of the sea, the water level of the collecting tank 60 is also raised.

If the water level of the collecting tank 60 is also raised, the sewerage is flowed backward into the detecting pipe body 108 through the reverse detecting pipe 181. The spherical floating body 106 is floated by buoyancy.

If the spherical floating body 106 receives the buoyancy, the buoyancy is acted to the front end member 141 of the check valve 104 which is integrally attached to the upper surface of the spherical floating body 106, and the front end member 141 of the check valve 104 is gradually pivoted upward about a bearing point of the rotational member 143 which is rotatably installed at the left and right hinge member 106 and 106a of the sewerage inlet pipe via the bushing 119 and the rotational shaft pin 118. If the water level of the sewerage arrives at the upper end of the sewerage outlet pipe 120, the buoyancy applied to the spherical floating body 106 becomes maximum and thus the tilted connection end 141a of the front end member 141 is forcibly contacted with the upper seat member 112 of the sewerage inlet pipe 110.

As described above, if the tilted connection end 141a of the front end member 141 is forcibly contacted with the upper seat member 112 of the sewerage inlet pipe 110, the tilted connection end 141a of the front end member 141 is closely contacted with the upper packing 132 disposed at the upper seat member 112 of the sewerage inlet pipe so as to completely block the sewerage inlet pipe 110 and the sewerage outlet pipe 120 (referring to FIG. 13) . In the state that the sewerage inlet pipe 110 and the sewerage outlet pipe 120 forming the inner drainage passage of the valve main body 101 are completely blocked, even though the water level of the reversed sewerage in the collecting tank 60 is further raised, it is completely prevented that the sewerage is flowed backward to the sewerage inlet pipe 110.

In such the state that the sewerage is flowed backward to the sewerage inlet pipe 110, if the water level of the sewerage in the collecting tank 60 is lowered below the height of the sewerage outlet pipe 120 or the detecting pipe body 108, the spherical floating body 106 is descended according to the water level of the reversed sewerage and the check valve 104 is also descended. Thus, the inner drainage passage of the valve main body is gradually opened.

Then, if the water level of the reversed sewerage is lowered below the height of the detecting pipe body 108, the check valve 104 is completely landed to the lower end landing part of the sewerage outlet pipe 120 so as to block the through hole part 122 so that the inner drainage passage of the valve main body 101 is completely opened to have its original diameter. Therefore, the apparatus 100 of reverse protection for the sewerage line is functioned as a distal member of the normal basal sewer pipe 70.

FIGs . 14 and 15 show an operation state in which the apparatus 100 of reverse protection for the sewerage line is installed at a drainage canal 80.

In the state that the apparatus 100 of reverse protection for the sewerage line is installed at the drainage canal 80, the sewerage inlet pipe 110 is connected with the distal part of the basal sewer pipe 70, and the valve main body is buried m an inner wall of the drainage canal 80 so that the sewerage outlet pipe 120 and the front end of the reverse detecting pipe 181 are positioned at the same surface of the inner wall of the drainage canal 80. The operation effect in the drainage canal 80 is the same as that in the collecting tank 60 as described above.

As shown in FIG. 14, if the water level in the drainage canal 80 is below the height of the reverse detecting pipe 181, the check valve 104 is landed to the lower end of the sewerage outlet pipe 120 and thus the apparatus 100 of reverse protection for the sewerage line is used as a distal member of the normal sewer pipe .

If the water level of the drainage canal 80 is raised f) above the height of the reverse detecting pipe 181, as shown in FIG. 15, the check valve 104 is ascended to block between the sewerage inlet pipe 110 and the sewerage outlet pipe 120, and thus it is used as a reverse protection apparatus for preventing the sewerage of the drainage canal 80 from flowing

10 backward to the basal sewer pipe 70.

FIGs. 16 and 17 show an operation state in which the apparatus 100 of reverse protection for the sewerage line is installed at a farm waterway water gate 42.

In the installation state that the apparatus 100 of in reverse protection for the sewerage line is installed at the farm waterway water gate 42, the valve main body is disposed to be buried into an inner wall from the farm waterway water gate 42, and the sewerage inlet pipe 110 is coupled to a distal part of a drainage pipe 34 connected with a farm 0 waterway pipe 32, and front ends of the sewerage outlet pipe

120 and the reverse detecting pipe 181 are located at the same surface as an outer wall of the farm waterway water gate 42.

The operation effect in the farm waterway water gate 42 is the same as that in the collecting tank 60 and the drainage canal 80, as described above.

As shown in FIG. 16, if the water level of the river 43 is below the height of the reverse detecting pipe 181, the check valve 104 is landed to a lower end of the sewerage outlet pipe 120 thus the apparatus 100 of reverse protection for the sewerage line is used as a distal member of the normal drainage pipe 34.

If the water level of the river 43 is raised above the height of the reverse detecting pipe 181, as shown in FIG. 17, the check valve 104 is ascended to block between the sewerage inlet pipe 110 and the sewerage outlet pipe 120, and thus it is used as a reverse protection apparatus for preventing the water of the river 43 from flowing backward to the farm waterway . In order to improving productivity, performance and quality, the present invention grasped by the configuration and the operation effect as described above may be modified to change a part of the configuration or further include other components . FIGs. 9 and 10 show another apparatus 100a of reverse protection for a sewerage line, which includes a means for facilely performing the operation of the check valve 104, a spherical floating body and a detecting pipe body having a proper specification. The apparatus 100a of reverse protection for the sewerage line uses the similar configuration to the apparatus 100 of reverse protection for the sewerage line, but the apparatus 100a has other check valve 104a which includes an extended rear end member 142a formed by further extending the rear end member 142 of the check valve 104, and a heavy weight 190 provided at a bottom surface of the extended rear end member 142a.

In addition, the apparatus 100a further includes a spherical floating body 106a of which a size is increased, and an extended rear detecting pipe 186 which can receive the check valve 104a.

Furthermore, the position of the rear part of the main body packing 134 is changed to the entrance side of the sewerage inlet pipe by the addition of the heavy weight 190, and a packing pressure member 187 for pressing the main body packing 134 is provided at the rear end part of the extended rear detecting pipe 186.

The installation and operation states of the apparatus lOOa of reverse protection for the sewerage line are the same as the apparatus 100 of reverse protection for the sewerage line, but there is some difference in the operation of the check valve 104.

In the apparatus 100a of reverse protection for the sewerage line, the check valve 104a keeps horizontal in the normal landing state by the heavy weight 190. However, if the spherical floating body 106a receives the buoyancy, it can rapidly raise the check valve 106a, and if the buoyancy becomes weak in the state that the check valve is raised, the check valve 106a can be rapidly descended by the heavy weight 190.

As the result, if the valve body has a large size, a size of the check valve 104a is increased and a weight thereof is also increased. Thus, a large operation force is required for the ascending rotation of the check valve 104a, but there is a limitation in increasing the volume and size of the spherical floating body to obtain the large operation force, and also there is a problem that the size of the detecting pipe body should be increased in proportion to the increased size of the spherical floating body. According to the present invention, it is possible to form the spherical floating body and the detecting pipe body having a proper specification even in the large scaled apparatus . FIG. 18 shows an apparatus 100b of reverse protection for the sewerage line according to yet another embodiment of the present invention, which can further ensure the reverse protection performance of the check valve.

The configuration of the apparatus 100b of reverse protection for the sewerage line are the same as that of the apparatus 100 of reverse protection for the sewerage line, but the lower wall of the detecting pipe body 108 is formed into an outer tilted part 188. If the lower wall of the detecting pipe body 108 is formed into an outer tilted part 188, even though the sewerage or sea water containing foreign materials is flowed backward into the detecting pipe body 108, it can be more facilely and reliably discharged, compared with the case that the sewerage or sea water is drained from the detecting pipe body 108. Therefore, an occurrence of a malfunction of obstructing the descending operation of the spherical floating body can be prevented.

According to the present invention, the spherical floating body may have a different specification to provide proper buoyancy, so that the check valve can maintain the normal reverse protecting operation corresponding to the reversed sewerage.

The configuration of the detecting pipe body may be functionally changed according to the changed specification of the spherical floating body.

Further, in the configuration of the present invention, the valve body, the check valve and the detecting pipe body may have various shaped cross section like a quadrangle. Those skilled in the art will appreciate that the conceptions and specific embodiments disclosed in the foregoing description may be readily utilized as a basis for modifying or designing other embodiments for carrying out the same purposes of the present invention. Those skilled in the art will also appreciate that such equivalent embodiments do not depart from the spirit and scope of the invention as set forth in the appended claims.

[industrial Applicability]

According to the apparatus of reverse protection for the sewerage line of the present invention, as described above, since the sewerage inlet pipe and the sewerage outlet pipe are formed on the horizontal axial line, it can be facilely installed to the existing horizontal sewerage line.

Further, since the inner drainage passage of the valve main body of the apparatus of reverse protection for the sewerage line is the complete open type, the sewerage containing various foreign materials having a large volume can be smoothly discharged.

Further, since the apparatus of reverse protection for the sewerage line of the present invention has a very simple structure, it has advantages of high productivity and low manufacturing cost. Particularly, since the operation elements are formed as the single member of the check valve, and the up/down rotation thereof is simple, it is possible to provide the high quality of apparatus of reverse protection for the sewerage line which has a very low occurrence rate of a 1 malfunction

Further, it is facile to change the specification by increasing or decreasing the entire structure on the basis of the proportional function, and thus it is facile to manufacture various sized apparatus.

10 Further, comparing with the conventional apparatus, the apparatus of reverse protection for the sewerage line of the present invention can be rapidly operated m response to the reverse flow of the sewerage or sea water. And in the reverse protecting operation, the apparatus can reliably and

I") hermetically block the drainage passage of the valve main body, and m a state that the reverse flow of sewerage is defused, the apparatus can rapidly and completely open the drainage passage, thereby considerably shortening flooded time.

The present invention having the above-mentioned effects

20 is ultimately used m the distal part of the sewer pipe which is disposed at the collecting tank, the river, the sea, the public water and the like so as to smoothly perform the normal function of draining the sewerage. Then, if the reverse flow of the sewerage is occurred, it can perform the reverse protection function of rapidly opening and closing the sewerage xnlet pipe in response to the circumstances, and also it can rapidly drain the sewerage or the sea water in the place flooded by other reasons except the reverse flow, thereby shortening flooded time. Therefore, the present invention can completely prevent the flooded damage.

Claims

[CLAIMS]

[Claim l]

AΠ apparatus of reverse protection for a sewerage line comprises :

5 a valve main body formed of a horizontal pipe body with a cylindrical cross section or a square cross section, one end of the valve body being formed into a sewerage inlet pipe and the other end thereof being formed into a sewerage outlet pipe on the same horizontal central shaft line;

]() a check valve front end landing part formed by a boundary end of a through hole, the through hole being formed by downwardly cutting an lower- side inner wall of a horizontal central shaft line from a middle part of the valve body toward the sewerage outlet pipe so as to form a straight tilted 15 surface in a cross section; a check valve rear end landing part formed by cutting a part of a circumference of an outer wall part of the sewerage inlet pipe of the valve body in a predetermined thickness to receive landing and operating space of the check valve rear 20 end part, following the through hole forming the check valve front end landing part of the sewerage outlet pipe; a check valve hinge member having a bearing member for longitudinally rotatably supporting left and right rotating members of the check valve, an inner side thereof being provided with a check valve rotating space part inserted with the left and right rotating members of the check valve toward the upper of the check valve rear end landing part with respect to left and right outer wall middle parts of the sewerage inlet pipe of the valve main body; a check valve of which an outer circumference of an front end member is overlapped in a predetermined width and closely inscribed with an inner side of the check valve front end landing part of the sewerage outlet pipe, a cross section of the front end member is formed into a tilted connection end which is closely contacted with an upper end of an inner wall of the sewerage inlet pipe upon upward rotation, an inner surface of a rear end part is formed into a spherical surface which is inscribed with a rear border line of the through hole part at one side of a middle part thereof, a rear end is formed to be adjacently circumscribed with the check valve rear end landing part of the sewerage inlet pipe in a landing state, and an upper end is formed into left and right rotational members which are inserted into the check valve hinge member of the sewerage inlet pipe, so that the check valve functions as a lower wall body for blocking a lower through hole part of the sewerage outlet pipe in the landing state so as to be penetrated onto the same surface as the inner surface of the sewerage inlet pipe and functions as an opening/closing body for opening and closing between the sewerage inlet pipe and the sewerage outlet pipe in an upward rotated state; a spherical floating body which has a cross section shape that can go in and out the through hole part forming the check valve front end landing part of the sewerage outlet pipe at a bottom surface of the front end of the check valve and also has buoyancy that can lift up the check valve to an upper side of the sewerage outlet pipe in response to the reversed sewerage incoming to a detecting pipe body to closely contact the tilted connecting end of the check valve to an inner wall of the sewerage inlet pipe; the detecting pipe body which is fixed to the lower end of the valve body, functions as a cover member for hermetically covering the check valve front end landing part, the check valve rear end landing part and the hinge members from an outside, secures receiving and operating space of the spherical floating body and the rear end of the check valve, and is integrally provided with a reverse detecting pipe which is perpendicularly connected with a lower front part of the sewerage pipe .

[Claim 2]

The apparatus according to claim 1, wherein a packing member is interposed at a front end tilt connecting end of the check valve to increase adhesion with an inner wall of the sewerage inlet pipe or the sewerage outlet pipe.

[Claim 3]

The apparatus according to claim 1, wherein a packing member is interposed at the inner surface of the middle part of the check valve to prevent a flow of the discharged sewerage to a hinge member by increasing the adhesion with a rear border end of the through hole part.

[Claim 4]

The apparatus according to claim 1, wherein an upper seat member of a smaller inner diameter having a step enough to receive a thickness of the check valve than an inner diameter of the sewerage inlet diameter with respect to a part that the front end tilted connection end of the check valve is closely attached upwardly is included in the valve body with respect to the border part of the sewerage inlet pipe and the sewerage outlet pipe.

[Claim 5]

The apparatus according to claim 1, wherein a lower seat member of a smaller inner diameter having a predetermined step at a border part of the sewerage inlet pipe of the through hole part to receive a thickness of the check valve at a circumference of an inner wall of the sewerage outlet pipe is included in the valve body with respect to the inner wall part of the sewerage inlet pipe of the valve body. [Claim 6]

The apparatus according to claim 1, wherein a packing member as a means for increasing adhesion and thus preventing foreign materials from being introduced to the hinge member is interposed at a lower end of the valve main body and an assembling contact part of the detecting pipe body.

[Claim 7]

The apparatus according to claim 1, wherein the flanges as a means for securing assembility, diassembility and assembling strength, which are respectively contacted up and down with left and right outer ends of a central axial line of the valve main body and an upper end of the detecting pipe body and then fixed by a fastening means of bolts and nuts, are provided at the lower end of the valve main body and the assembling part of the detecting pipe body.

[Claim 8]

The apparatus according to claim 1, wherein a packing member, which is closely contacted with an circumference of the rear end of the check valve when the rotation of the check valve is finished so as to prevent the reversed sewerage from being introduced to the hinge member, is interposed at an ") inner rear part of the detecting pipe body.

[Claim 9]

The apparatus according to claim 1, wherein the check valve further comprises an extended rear end member formed by

U) further extending the rear end member of the check valve, and a heavy weight provided at a bottom surface of the extended rear end member so as to land the front end of the check valve on a front landing part of the sewerage in a normal state and lift up the check valve upwardly in a state that the sewerage

11 is flowed backward.

[Claim lθ]

The apparatus according to claim 4, wherein a packing member for increasing the adhesion with the tilted connection/ '0 end of the check valve and thus increasing a blocking efficiency of the reversed sewerage is interposed at the upper seat member.

[Claim 11] The apparatus according to claim 5, wherein a packing member for increasing the adhesion with the middle member of the check valve and thus preventing the discharged sewerage from being introduced to the hinge member is interposed at the