KR102524742B1 - Sump device - Google Patents

Abstract

The present invention relates to an intercepting chamber device, which effectively prevents rapid backflow of sewage, comprising: a first flow path formed to discharge excrement by a flow path pipe unit; a second flow path formed to discharge domestic sewage; and a backflow prevention unit including first and second opening/closing units.

Description

Sewage receiving device {Sump device}

The present invention relates to a sewage inlet device, and more particularly, by supplying air to the inside of a U-trap into which domestic sewage flows in to form a vortex so that foreign substances or floating matters contained in domestic sewage are not accumulated inside the U-trap, and manure and It relates to a sewage receiving device having a backflow prevention device for discharging domestic sewage to an outlet while preventing it from mixing with each other.

In general, a septic tank serves as an intermediate septic tank for receiving and temporarily storing sewage, filtering the debris contained in it and sending it back through the drain pipe, or sending the sewage back to the main pipe through the drain pipe without filtering the waste water. It can be said to be a device, and the sewage inlet that performs these functions was used by determining the capacity and size of sewage treatment according to the installation place and purpose of use, and manufactured in various shapes suitable for it.

In the case of conventional household sewage inlets, most of them have been divided into a sewage inlet for household wastewater and a sewage inlet for toilet bowls, but this has a problem in that at least two sewage inlets must be separately purchased and installed.

In addition, the conventional sewage receiving device has a problem in that sludge contained in sewage, that is, sand and foreign substances, etc. are not discharged to the outside, and accordingly, the sludge is accumulated in the U-trap and obstructs the flow of sewage.

In order to solve the above problems, Republic of Korea Patent Registration No. 10-1296212 (hereinafter referred to as "prior art") relates to a flow path separation type sewage inlet equipped with a backflow prevention device. A backflow prevention device is provided to separate the first flow path discharged from the second flow path through which domestic sewage is discharged so that manure and domestic sewage are not mixed inside the body and are discharged through the discharge port and prevent the backflow of odors. Disclosed is a one-way separable sewage receiver.

1 is a cutaway perspective view showing a sewage receiver according to the prior art. Referring to FIG. 1, the sewage inlet according to the prior art includes a body portion 10 through which manure and domestic sewage are collected and discharged, a main inlet 11 formed so that manure can flow into the body portion 10, and living An auxiliary inlet 12 formed in the body part 10 so that sewage can flow in and an outlet 13 through which manure and domestic sewage are discharged, and an inner side of the body part 10 so as to be connected to the auxiliary inlet 12. It includes a formed U trap, and one end is connected to the oil inlet 11 inside the body portion 10, and the other end is connected downward with respect to the center of the outlet 13 to form the outlet 13. The first flow path 20 through which manure is discharged is formed by the direct pipe part 22 dividing the upper and lower parts, and the discharge port (20) based on the center of the discharge port 13 through the outer surface of the direct pipe part 22 13) is formed on the upper part of the second flow path 21 through which domestic sewage overflowing from the U-trap is discharged, and is rotatably coupled to the other end of the direct-connected pipe part 22 inside the outlet 13 to make the first By opening and closing the first flow path 20 and the second flow path 21, a backflow prevention device 30 is included to prevent domestic sewage and manure discharged to the discharge port 13 from flowing backward.

In addition, the backflow prevention hole 30 is inserted into the discharge port 13 and abuts on the upper part of the other end of the direct connection pipe part 22 to partition the first flow path 20 and the second flow path 21 up and down The support diaphragm 31 is hinged to the support diaphragm 31 and configured to be rotatable in the upper direction of the support diaphragm 31 to open and close the second flow path 21, thereby discharging the second flow path 21 at the side of the outlet 13 ), an upper cover 32 that prevents waste water from flowing backward, is installed to share a rotating shaft with the upper cover 32, and is configured to be rotatable in the downward direction of the support diaphragm 31 to open and close the first flow path 20. By doing so, it is configured to include a lower cover 33 that prevents sewage from flowing back to the first flow path 20 from the discharge port 13 side.

According to the prior art, the upper cover 32 normally opens the second flow path 21, and when the sewage flows backward, the upper cover 32 is rotated upward by the backward flow of sewage to the second flow path ( 21) is closed to prevent backflow of sewage.

However, in the case of reverse flow of sewage caused by a rise in water level in a collection well, public sewage pipe, or river during a torrential rain, sewage may rapidly flow backward. In this case, the upper cover 32 is rotated to close the second flow path 21. If reverse flow occurs before, there is a problem that the upper cover 32 is prevented from rotating in the upper direction by the reverse flow of sewage, so that the second flow path 21 is not closed.

Republic of Korea Patent No. 10-1296212

The present invention has been made to solve the above problems, and separates the first flow path through which manure is discharged from the inside of the body of the sewage inlet and the second flow path through which domestic sewage is discharged, so that manure and domestic sewage can be discharged from the inside of the body. It is an object of the present invention to provide a sewage receiving device installed with a backflow prevention unit to ensure that is discharged through an outlet without being mixed and to prevent backflow of sewage despite rapid retention of sewage at the outlet.

The present invention is a body portion through which manure and domestic sewage are collected and discharged, an inlet formed to allow manure to flow into the body, an auxiliary inlet formed in the body to allow domestic sewage to flow in, and manure and domestic sewage to be discharged. A sewage receiving device comprising a discharge port and a U-trap formed inside the body portion to be connected to the auxiliary inlet, wherein the sewage receiving device has one end connected to the filling inlet inside the body portion and the other end A first flow path connected to the lower side with respect to the center of the discharge port and formed so that manure is discharged by a flow pipe portion dividing the discharge port into upper and lower parts; a second flow path formed in the upper part of the discharge port based on the center of the discharge port through the outer surface of the flow pipe part in the U-trap, so that domestic sewage overflowing from the U-trap is discharged; And a first opening/closing portion rotatably coupled to the other end of the flow pipe portion by a first hinge shaft inside the outlet to open and close the first flow path, and the outlet rotatably by a second hinge shaft inside the outlet. Attached to the inner wall of the backflow prevention unit including a second opening and closing portion for opening and closing the second flow passage, wherein the first opening and closing portion and the second opening and closing portion normally close the first and second flow passages, respectively. It is characterized in that the first passage or the second passage is temporarily opened by the discharge pressure of the manure or domestic sewage only when the manure or domestic sewage is discharged to the outside.

In addition, the first opening and closing portion fitting member including a fitting recessed portion formed by being recessed at one end to a height corresponding to the thickness of the flow pipe portion so as to be fitted to the other end of the flow pipe portion; a first hinge axis provided at the other end of the fitting member; A first door having one end rotatably coupled to the first hinge shaft to open or close the first passage, wherein the second opening/closing part is attached to an inner wall of the outlet above the first opening/closing part. board; a second hinge axis provided at the center of the attachment plate; and a second door having one end rotatably coupled to the second hinge shaft to open or close the second passage.

In addition, it is characterized in that it further comprises; a vibrating member attached to the other side of the second door to vibrate the second door.

In addition, it is characterized in that it includes; a blocking member made of rubber material formed so as to come into contact with a stepped step inclined at the other side of the first door on one side of the other end of the second door.

In addition, the rotation angle of the first door is formed by protruding along the inner wall of the lower portion of the flow pipe portion, and the other side surface is in contact with one side surface of the first door so that the first door does not enter the inside of the flow pipe portion. Sewage receiving device further comprising a rotational bump for determining the range of.

In addition, it is characterized in that it further comprises an air supply unit for supplying high-pressure air to the inside of the U-trap.

In addition, the air supply unit may include an air supply device for generating high-pressure air; an air transfer pipe that transfers the high-pressure air generated by the air supply device to the U-trap; An “A” shaped injection pipe inserted into an opening formed on a bottom surface of the U-trap and connected by a connection tab so as to communicate watertightly with the other end of the air transport pipe; A strainer installed at the other end of the injection pipe; and a third door rotatably connected to the other end of the injection pipe by a third hinge shaft and opening the other end of the injection pipe by the pressure of air injected at high pressure.

In addition, the air supply unit further includes a protrusion formed integrally protruding from the other end of the injection pipe, and the third door is rotatably connected to the other end of the protrusion by a third hinge shaft to generate high pressure. It is characterized in that the other end of the injection pipe is opened by the pressure of the air to be injected.

According to the sewage inlet device of the present invention, by installing a backflow prevention unit for preventing the backflow of sewage despite a rapid backflow of sewage, it is possible to prevent the occurrence of odor due to the backflow of sewage.

In addition, including an air supply unit that supplies air to the inside of the U-trap, a vortex is created in the process of discharge of domestic sewage to the discharge pipe by the air supply unit, so that foreign substances or floating matters contained in the domestic sewage accumulate inside the U-trap, forming sludge. To prevent this from happening, the discharge of domestic sewage proceeds smoothly.

1 is a cutaway perspective view showing a sewage receiver according to the prior art.
2 is a perspective view of a sewage receiving device according to an embodiment of the present invention.
3 is a plan view of a sewage receiving device according to an embodiment of the present invention.
4 is a cross-sectional view showing a first flow path according to an embodiment of the present invention.
5 is a cross-sectional view showing a second flow path according to an embodiment of the present invention.

Hereinafter, a sewage receiving device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

In describing the embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the embodiment of the present invention, which may vary according to the intention or custom of a user or operator. Therefore, the definition should be made based on the contents throughout this specification.

The present invention relates to a sewage inlet device, and more particularly, by supplying air to the inside of a U-trap into which domestic sewage flows in to form a vortex so that foreign substances contained in domestic sewage are not accumulated inside the U-trap, and manure and domestic sewage are It relates to a sewage receiving device equipped with a backflow prevention device for discharging to a discharge port while preventing them from mixing with each other.

2 is a perspective view of a sewage receiving device according to an embodiment of the present invention, and FIG. 3 is a plan view of the sewage receiving device according to an embodiment of the present invention.

4 is a cross-sectional view showing a first flow path according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view showing a second flow path according to an embodiment of the present invention.

2 to 4, the sewage receiving device of the present invention includes a body, an oil inlet, an auxiliary inlet, an outlet, a U-trap, a flow tube, a backflow prevention unit, and an air supply unit.

The body part has a cylindrical pipe wall with an open upper part for collecting and discharging manure and domestic sewage, and has a filling inlet, an auxiliary inlet and an outlet along the circumference.

The main inlet is formed so that manure can flow into the body, and the auxiliary inlet is formed so that sewage and sewage can flow into the body. In one embodiment of the present invention, two auxiliary inlets are provided. .

However, the number of auxiliary inlets formed along the circumference of the body is not limited thereto and may vary depending on the size of the body and the use of the sewage receiver.

The outlet discharges manure and domestic sewage introduced into the body through the main inlet and the auxiliary inlet.

In one embodiment of the present invention, the filling inlet and the outlet are located opposite each other, and the two auxiliary inlets may be located on both sides of the filling inlet.

In addition, a U-trap with an air supply unit is formed inside the body to be connected to the auxiliary inlet to prevent odor from flowing backward through the auxiliary inlet. The U trap and the air supply unit will be described in detail below.

On the other hand, one end of the flow pipe part is connected to the fuel inlet inside the body and the other end is directly connected to the lower side with respect to the center of the outlet to divide the outlet into upper and lower parts.

The other end of the flow pipe part is formed in a horizontal upper side to completely partition the upper and lower parts of the discharge port based on the center of the discharge port.

At this time, the first flow path formed so that the manure flowing into the filling inlet through the flow pipe portion is discharged through the discharge port and the U-trap is formed at the upper part of the discharge port based on the center of the discharge port through the outer surface of the flow pipe portion in the U trap. Through the second flow passage formed to discharge domestic sewage that overflows, the excreta can be directly delivered to the discharge port and discharged to the outside without being exposed from the inside of the body in the form of irrigation by the flow pipe portion.

By completely dividing the discharge port up and down in the flow pipe part, the manure is discharged to the outside through the first passage, and the domestic sewage is discharged to the outside through the second passage, and the manure and domestic sewage are not mixed inside the body. It can be discharged through the outlet.

Through this, there is an advantage that manure and domestic sewage can be discharged at the same time using one sewage receiving device.

On the other hand, the backflow prevention part is rotatably coupled to the other end of the flow pipe part inside the outlet by a first hinge shaft to open and close the first flow path, and the second hinge shaft inside the outlet. It is configured to include a second opening/closing portion that is rotatably attached to an inner wall of the outlet and opens and closes the second flow path.

At this time, the first opening/closing part and the second opening/closing part normally close the first flow passage and the second flow passage, respectively, and temporarily by the discharge pressure of the manure or domestic sewage only when the manure or domestic sewage is discharged to the outside. The first flow path or the second flow path may be opened.

The first opening/closing part is provided at the other end of the fitting member including a fitting recessed portion formed by being recessed at one end at a height corresponding to the thickness of the flow pipe part so as to be fitted to the other end of the flow pipe part. It is configured to include a first hinge axis, one end of which is rotatably coupled to the first hinge axis to open or close the first passage.

The second opening/closing unit has an attachment plate attached to an inner wall of the discharge port above the first opening/closing unit, a second hinge axis provided at the center of the attachment plate, and one end portion rotatably coupled to the second hinge shaft, It is configured to include a second door that opens or closes the 2 flow path.

According to the backflow prevention device of the prior art shown in FIG. 1, the upper cover closes the second flow path only when sewage flows backward, which means that when a rapid reverse flow of sewage occurs, the upper cover closes the second flow path before the upper cover closes the second flow path. If the flow reverses and goes over the upper cover, the rotation of the upper cover may be hindered by the reverse flow of sewage, so that the second passage may not be closed. The second door of the present invention normally closes the second passage condition is maintained and the second door opens the second passage while rotating upward with respect to the second hinge axis by the inflow pressure of the domestic sewage only when the domestic sewage flows through the outlet through the second passage.

That is, the second door according to an embodiment of the present invention opens the second flow path only when domestic sewage flows along the second flow path, so that the second flow path remains closed even if a rapid reverse flow of sewage occurs. Thus, it prevents sewage from flowing into the body through the second passage.

On the other hand, an anti-rotation bump for limiting the range of the rotation angle of the first door so that the first door does not enter the inside of the flow pipe portion is formed protruding along the inner wall of the lower portion of the flow pipe portion, the first door is normally in a state in which one side is in contact with the other side of the anti-rotation bump, so that the first door blocks the other side of the flow pipe portion while preventing it from entering the inside of the flow pipe portion, thereby closing the first flow path.

In addition, as the lower part of the second door is overlapped with the upper part of the first door, when the first door is rotated in an upward direction based on the first hinge axis, the second door moves along the first door. It rotates based on the second hinge axis while moving along the other side of the first door while in contact with the other side of the.

However, even if the second door is rotated by the rotation of the first door, the lower part of the second door maintains a state in contact with the other side of the first door, so that the closed state of the second flow path is continuously maintained. Even if it flows to the outlet along the first flow path, back flow to the second flow path is prevented.

Meanwhile, when the living water flow flows along the second flow path, only the second door rotates based on the second hinge axis, and the first door maintains the first flow path closed, so that the first flow water flow It is prevented from flowing backward through the passage into the inside of the passage pipe.

In addition, when the sewage flows backward, the first door and the second door are rotated toward the body by the pressure applied from the discharge part toward the body according to the flow of the sewage flowing backward. Force on the first and second doors This can be applied, and the first door and the second door are rotated toward the body by the anti-rotation bump to prevent the first and second flow passages from being opened, thereby preventing sewage flowing backwards from flowing into the body. will block

In addition, as shown in FIGS. 4 and 5, one end of the fitting member forming the fitting recessed portion is formed to be inclined, and one end and the other end of the attachment member are also formed to be inclined, respectively, so that the first flow path and the second flow path are formed. Manure and domestic sewage flowing to the discharge unit along the passage can flow naturally along the inclined portions of the fitting member and the attachment member, and foreign substances can be prevented from being stuck to the attachment member and the fitting member.

In addition, the second door according to an embodiment of the present invention further includes a vibration member attached to the other side to vibrate the second door.

The vibrating member may be connected to a power supply source through a wire to receive power from a separate external power supply source (not shown), and the power supply source may be driven by a battery.

In addition, in order to prevent the vibration member from being damaged by dirty water, it is preferable that the vibration member is attached to the other side of the second door and then the outer surface is covered by a waterproof member.

The vibrating member may be manually driven by a separate external controller, may be set to be driven only while the second door is open, or may be set to be driven for a predetermined time at a specific period.

However, when the second door is set to be driven only while it is open, the upward rotation of the second door is detected, the opening of the second passage is detected, or the flow of sewage through the second passage is detected. A separate sensor for detecting may be required.

As the vibrating member vibrates the second door, the entire anti-backflow unit of the present invention can vibrate, and as the first door, the second door, the fitting member, and the attachment plate vibrate, foreign substances contained in the sewage are removed from the first By preventing the hinge shaft and the second hinge shaft from being caught or attached to the first door, the second door, the fitting member, and the attachment plate, it is possible to prevent the first and second flow paths from being clogged with foreign substances. In addition, it is possible to prevent malfunction of the backflow prevention unit due to foreign matter being caught.

In addition, one side of the other end of the second door according to an embodiment of the present invention includes a blocking member made of rubber material formed so as to come into contact with the step inclined on the other side of the first door. As the blocking member made of rubber is in contact with each other, the second passage may be closed more smoothly.

The U-trap is formed in a hemispherical shape so as to accommodate a certain amount of domestic sewage introduced through the auxiliary inlet pipe and serve to prevent the odor of domestic sewage from flowing backward through the auxiliary inlet pipe.

The sewage receiving device according to an embodiment of the present invention includes an air supply unit for supplying high-pressure air to the inside of the U-trap, and the air supply unit is installed outside the U-trap to generate high-pressure air. A supply device, an air transport pipe that delivers the high-pressure air generated in the air supply device to the U-trap, and a connection tab inserted into an opening formed on the bottom surface of the U-trap to communicate watertightly with the other end of the air transport pipe. A connected “A” shaped injection pipe, a sieve installed at the other end of the injection pipe, and a third hinge axis rotatably connected at the other end of the injection pipe by the pressure of air injected at high pressure to the injection pipe It is configured to include a third door for opening the other end of.

In addition, the air supply unit according to an embodiment of the present invention may further include a protrusion formed integrally protruding from the other end of the injection pipe, and the third door is connected to the third hinge shaft from the other end of the protrusion. The other end of the injection pipe is opened by the pressure of air injected at high pressure.

At this time, the air supply unit can be operated only while domestic sewage flows into the U-trap through the auxiliary inlet, and as the air supply unit for supplying high-pressure air to the inside of the U-trap is provided, the air flowing into the U-trap By forming a vortex in the domestic sewage, it is possible to prevent floating matters or foreign substances included in the domestic sewage from accumulating on the bottom of the U-trap, and by supplying air to the domestic sewage, the odor generated from the domestic sewage accommodated in the U-trap can be reduced. .

In addition, in order to create a vortex in the sewage flowing into the inside of the U-trap, no separate parts or components are installed inside the U-trap, and high-pressure air is used to prevent sewage from flowing along the second flow path. There is an advantage in that domestic sewage is smoothly discharged to the outside through the discharge part along the second flow path.

In addition, since the injection pipe according to an embodiment of the present invention is installed on the bottom surface of the U-trap, the air injected through the injection pipe naturally spreads throughout the U-trap.

In addition, since the sieve and the third door are provided, the injection pipe is closed while air is not being injected, thereby preventing foreign substances or floating matters included in domestic sewage from entering the injection pipe and the air delivery pipe.

In particular, by providing a space between the third door and the sieve through a protrusion formed integrally protruding from the other end of the injection pipe, foreign substances or floating matter in domestic sewage that the third door has not yet blocked are removed from the third door. By being accommodated between the door and the strainer, it is possible to more effectively prevent foreign matter or floating matter included in domestic sewage from entering the inside of the injection pipe and the air transfer pipe.

In addition, foreign substances or floating substances accommodated between the third door and the sieve are discharged back into the U-trap as high-pressure air is injected through the air supply pipe, thereby preventing foreign substances or floating matters from being accumulated between the third door and the sieve. do.

The present invention is to improve the sewage inlet device of the prior art, which cannot effectively prevent the rapid reverse flow of sewage, by separating the first flow path through which manure is discharged and the second flow path through which domestic sewage is discharged from the inside of the body of the sewage inlet. By providing a sewage inlet device equipped with a backflow prevention unit that prevents the backflow of sewage despite rapid retention of sewage while ensuring that the manure and domestic sewage are not mixed and discharged through the discharge port inside the body, odors caused by the backflow of sewage are generated. prevent that

In addition, by including an air supply unit for supplying air to the inside of the U-trap, as domestic sewage can generate vortices in the process of being discharged to the discharge pipe, foreign substances contained in domestic sewage are accumulated inside the U-trap and sludge is formed. By preventing it, the discharge of domestic sewage proceeds smoothly.

The present invention is not limited to the specific preferred embodiments described above, and various modifications can be made by anyone skilled in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes are within the scope of the claims.

100: body part
200: fuel inlet
300: auxiliary inlet
400: outlet
500: U trap
600: air supply unit

Claims (8)

A body part through which manure and domestic sewage are collected and discharged, a main inlet formed so that manure flows into the body part, an auxiliary inlet formed in the body part so that domestic sewage flows in, and an outlet through which manure and domestic sewage are discharged, , In the sewage receiving device configured to include a U-trap formed inside the body portion to be connected to the auxiliary inlet,
The sewage receiving device,
A first flow path formed so that manure is discharged by a flow pipe part having one end connected to the filling inlet inside the body and the other end connected downward with respect to the center of the discharge hole to partition the discharge port into upper and lower parts;
a second flow path formed in the upper part of the discharge port based on the center of the discharge port through the outer surface of the flow pipe part in the U-trap, so that domestic sewage overflowing from the U-trap is discharged; and,
The first opening/closing part rotatably coupled to the other end of the flow pipe part by a first hinge shaft inside the outlet to open and close the first flow path and the outlet of the outlet rotatably by a second hinge shaft inside the outlet. A backflow prevention unit including a second opening and closing unit attached to an inner wall to open and close the second flow path; includes,
The first opening/closing part and the second opening/closing part normally close the first flow passage and the second flow passage, respectively, and only when the manure or domestic sewage is discharged to the outside, the discharge pressure of the manure or domestic sewage temporarily causes the removal of the waste water. Open 1 euro or 2 euro,
The first opening and closing part,
A fitting member including a fitting recessed portion formed by being recessed at one end at a height corresponding to the thickness of the flow pipe portion so as to be fitted to the other end of the flow pipe portion;
a first hinge axis provided at the other end of the fitting member;
A first door having one end rotatably coupled to the first hinge shaft to open or close the first passage,
The second opening and closing part,
an attachment plate attached to an inner wall of the outlet on the upper side of the first opening/closing unit;
a second hinge axis provided at the center of the attachment plate;
A second door having one end rotatably coupled to the second hinge shaft to open or close the second passage,
A vibration member attached to the other side of the second door to vibrate the second door; further comprising,
The sewage receiving device comprising a rubber material blocking member formed on one side surface of the other end of the second door so as to come into contact with a step formed obliquely on the other side surface of the first door. delete delete delete According to claim 1,
The range of the rotation angle of the first door is formed by protruding along the inner wall of the lower part of the flow pipe portion, and the other side surface is in contact with one side surface of the first door so that the first door does not enter the inside of the flow pipe portion. Sewage receiving device further comprising a rotational bump for determining the. According to claim 1,
The sewage receiving device further comprises an air supply unit for supplying high-pressure air to the inside of the U-trap. According to claim 6,
The air supply unit,
An air supply device that generates high-pressure air;
an air transfer pipe that transfers the high-pressure air generated by the air supply device to the U-trap;
An “A” shaped injection pipe inserted into an opening formed on a bottom surface of the U-trap and connected by a connection tab so as to communicate watertightly with the other end of the air transport pipe;
A strainer installed at the other end of the injection pipe;
and a third door rotatably connected to the other end of the injection pipe by a third hinge shaft and opening the other end of the injection pipe by the pressure of air injected at high pressure. . According to claim 7,
The air supply unit,
Further comprising a protrusion formed integrally protruding from the other end of the injection pipe;
The sewage receiving device, characterized in that the third door is rotatably connected to the other end of the protrusion by a third hinge shaft and opens the other end of the injection pipe by the pressure of air injected at high pressure.

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