Heel control system of culturing farm caring ship

Abstract

The present invention relates to a transverse inclination control system for a management vessel for an aquaculture farm, and more specifically, to a transverse inclination control system for a management vessel for an aquaculture farm that prevents the tilting of the management vessel during operation by a work crane by enabling high-pressure discharge of sucked water in the underwater direction to lift the tilted side of the hull when one side of the management vessel for an aquaculture farm sinks and tilts in the underwater direction due to a load applied to a work crane. The present invention comprises: a tilt sensor (200) installed in the central part of a hull (100) where a work crane (110) is installed to measure the tilt of the hull (100); and a first transverse inclination response part (300) installed at the lower part of one side of the hull (100) in the direction where the work crane (110) is installed, configured to selectively discharge sucked water in the outer direction of the hull or in the underwater direction. The apparatus is characterized by comprising: a second transverse inclination response unit (400) mounted on the lower side of the hull (100) to selectively discharge the sucked-in water in the direction of the outer side of the hull or the underwater direction; and a main control unit (800) that determines the tilt of the hull through a signal received from the tilt sensor (200), transmits a discharge signal to the first transverse inclination response unit (300), and controls the first transverse inclination response unit (300) to discharge water in the direction of the outer side of the hull (100).

Description

Technology Field

[0001] The present invention relates to a transverse inclination control system for a management vessel for an aquaculture farm, and more specifically, to a transverse inclination control system for a management vessel for an aquaculture farm that prevents the tilting of the management vessel during operation by a work crane by allowing the sucked-in water to be discharged at high pressure in the underwater direction to lift the tilted side of the hull when one side of the management vessel for an aquaculture farm sinks and tilts in the underwater direction due to a load applied to a work crane. Background Technology

[0003] During the operation or anchoring of a vessel, rolling or trimming phenomena occur, in which the hull tilts to one side due to waves, differences in the amount of cargo loaded, etc. To prevent this, the vessel is provided with ballast tanks to balance the hull in the left-right or fore-and-aft directions. These ballast tanks maintain the horizontal level of the hull by regulating the water volume inside the tanks to prevent the hull from tilting to one side.

[0004] However, conventional technology that uses ballast tanks to maintain the horizontal level of the hull has the problem that it cannot respond quickly to the rocking of the hull because high-output pumps must be used to fill or drain water from the ballast tanks, which not only consumes a lot of energy but also takes a long time to fill or drain the water.

[0005] In addition, the use of ballast tanks requires additional processes and costs, such as painting to prevent corrosion of the tank and sterilizing the ballast water. Furthermore, especially when a crane is installed on a management vessel for aquaculture farms to transport heavy loads, the hull tilts during the process of transporting aquaculture feed or aquaculture products to the crane, leading to problems such as the risk of the vessel capsizing and increased safety accidents for workers due to the slippery deck floor. Therefore, there is an urgent need to develop technology that can quickly respond to the tilting of the hull and restore its balance.

[0006] The technology forming the background of the present invention is disclosed in Korean Registered Patent No. 10-1390367, which includes a marine work vessel and a method for controlling the attitude of the vessel. The problem to be solved

[0008] The present invention was conceived in consideration of the above-mentioned circumstances, and the objective of the present invention is to provide a transverse inclination control system for a fish farm management vessel that enables safe operation of the work crane by controlling the attitude of the hull so that one side of the management vessel in the direction of the work crane does not tilt when one side of the management vessel tilts during the process of transferring heavy objects through a work crane installed on the management vessel for a fish farm. This is achieved by high-pressure discharge of water sucked in from the first transverse inclination corresponding part in the underwater direction. means of solving the problem

[0010] The present invention for achieving the above objective comprises: a tilt sensor (200) installed in the central part of a hull (100) where a work crane (110) is installed to measure the tilt of the hull (100); a first transverse inclination response part (300) installed on the lower part of one side of the hull (100) in the direction where the work crane (110) is installed to selectively discharge sucked water toward the outer direction of the hull or the underwater direction; and a second transverse inclination response part (400) mounted on the lower part of the other side of the hull (100) to selectively discharge sucked water toward the outer direction of the hull or the underwater direction. The system is configured to include a main control unit (800) that determines the tilt of the hull through a signal received from the tilt sensor (200) and transmits a discharge signal to the first transverse inclination response unit (300) to control the discharge of water from the first transverse inclination response unit (300) toward the outer direction of the hull (100); wherein, when the tilt of the hull (100) is detected while the first and second transverse inclination response units (300, 400) are installed on one side and the other side of the hull (100), the main control unit (800) controls the discharge of water from the transverse inclination response unit on one side toward the underwater direction and controls the discharge of water from the transverse inclination response unit on the other side toward the outer direction of the hull; and the main control unit (800) comprises a communication unit (810) for wired or wireless transmission and reception of signals, and to the communication unit (810) The apparatus is configured to include an inclination risk assessment unit (830) that determines the risk of transverse inclination of the hull by comparing the received inclination sensor's sensing value with normal hull data set in the data storage unit (820), and a drive control unit (840) that transmits a drive signal for driving a transverse inclination response unit to the communication unit (810) when a dangerous state is determined by the judgment of the inclination risk assessment unit (830); the communication unit (810) is configured to include a sensor communication interface (811) that receives hull inclination sensing data from the inclination sensor (200) in real time, and a drive signal interface (812) that transmits a drive signal received through the drive control unit (840) to the transverse inclination response unit; and the first and second transverse inclination response units (300, 400) areThe system is configured to include a drive motor section (500), a main case (600) connected to one side of the drive motor section (500) and having a rotating impeller (620) installed inside, and a discharge flow guide means (700) connected to a discharge port (601) of the main case (600) to guide water sucked into the interior of the main case (600) to flow selectively toward the outside of the hull or in the underwater direction and discharge, wherein the main case (600) is composed of a case cover (610) connected to the drive motor section (500) so that the shaft axis (520) of the drive motor section (500) is exposed, and a case body (630) mounted on the case cover (610) to accommodate the rotating impeller (620) which is rotatably connected to the shaft axis of the drive motor section (500), and the water sucked from the outside of the ship is in the case body (630). A hollow joint (631) for connecting to a flowing pipe and a hollow discharge port (632) that allows water rotated in the case body (630) to be discharged by the rotation of the rotating impeller (620) are formed, and the discharge flow path guiding means (700) comprises a flow path body (710) formed at an outer circumference with a horizontal discharge pipe (711) that guides the sucked water to be discharged in the direction of the outer side of the hull and guides the sucked water to be discharged in the direction of the underwater discharge pipe (712) that guides the sucked water to be discharged in the direction of the underwater discharge pipe, and a direction changer (720) that is rotatably installed inside the flow path body (710) to guide the water flowing from the main case (600) to either the horizontal discharge pipe (711) or the underwater discharge pipe (712), and the It comprises a motor member (730) which is installed to be axially coupled to the upper part of the direction changer (720) and is driven by a driving signal from the main control unit (800) to rotate the direction changer (720), and a mounting cover (740) which is coupled to the upper side of the Euro body (710) to prevent external exposure of the motor member (730) and the direction changer (720).The above Euro body (710) is characterized by having a connection guide channel (713) connected to the discharge port (632), and the direction change port (720) is characterized by having a change channel (721) formed to guide water flowing in from the connection guide channel (713) to flow in the direction of the horizontal discharge pipe (711) or the underwater discharge pipe (712).

[0011] delete

[0012] delete Effects of the invention

[0014] According to the present invention, when performing the transfer of heavy objects (aquaculture harvested materials, aquaculture materials) using a work crane installed on an aquaculture management vessel, tilting of the hull is prevented, thereby preventing safety accidents such as the vessel capsizing and workers slipping and falling on a slippery deck floor. Furthermore, the work crane operation can be performed safely through the control of the hull's posture, thereby allowing for the expectation of improved work efficiency. Brief explanation of the drawing

[0016] FIG. 1 is a state diagram showing an embodiment of a management vessel for an aquaculture farm to which a transverse inclination control system for a management vessel for an aquaculture farm according to the present invention is applied. FIG. 2 is a diagram showing a state in which one side of a management vessel for an aquaculture farm according to the present invention is tilted. FIG. 3 is a diagram showing the state in which the other side of a management vessel for an aquaculture farm according to the present invention is tilted. FIG. 4 is a diagram showing the separated state of the first and second transverse inclination corresponding parts according to one embodiment of the present invention. FIG. 5 is a state diagram showing the separated state of a discharge flow path guide means according to one embodiment of the present invention. FIG. 6 is a state diagram showing the cross-sectional state of a direction changer according to one embodiment of the present invention. FIG. 7 is a block diagram in which the first and second transverse inclination corresponding parts are wired or wirelessly connected to the main control unit according to the present invention. FIG. 8 is a block diagram showing a main control unit according to the present invention. Specific details for implementing the invention

[0017] Hereinafter, a transverse inclination control system for a fish farm management vessel according to the present invention will be described in detail with reference to the attached drawings. Prior to this, in describing the present invention, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the essence of the present invention, such detailed description will be omitted.

[0018] In addition, the terms described below are established considering their functions in the present invention, and these terms may vary depending on the intention or practice of the producer or manufacturer producing the product. Furthermore, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of explanation. The embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0019] Furthermore, when it is stated throughout the specification that a part is 'connected' to another part, this includes not only cases where they are 'directly connected,' but also cases where they are 'indirectly connected' with other elements interposed between them. Additionally, the term 'comprising' a component means that, unless specifically stated otherwise, it does not exclude other components but rather allows for the inclusion of additional components.

[0020] FIG. 1 is a state diagram showing an embodiment of a management vessel for a fish farm to which a transverse inclination control system for a management vessel for a fish farm according to the present invention is applied; FIG. 2 is a state diagram showing one side of the management vessel for a fish farm according to the present invention in a state of inclination; FIG. 3 is a state diagram showing the other side of the management vessel for a fish farm according to the present invention in a state of inclination; FIG. 4 is a state diagram showing the first and second transverse inclination corresponding parts in a separated state according to an embodiment of the present invention; FIG. 5 is a state diagram showing the separated state of the discharge flow path guiding means according to an embodiment of the present invention; FIG. 6 is a state diagram showing the cross-sectional state of a direction changer according to an embodiment of the present invention; FIG. 7 is a block diagram showing the first and second transverse inclination corresponding parts connected wirelessly or via wired connection to the main control unit according to the present invention; FIG. 8 is a block diagram showing the main control unit according to the present invention.

[0021] As illustrated in FIGS. 1 to 8 above, the transverse inclination control system for a fish farm management vessel according to the present invention may be configured to include a tilt sensor (200) installed on a hull (100), a first transverse inclination response unit (300) installed on one side lower of the hull (100), and a main control unit (800) that transmits a signal to the first transverse inclination response unit (300) to control the discharge of sucked-in water.

[0022] That is, the transverse inclination control system for a fish farm management vessel according to the present invention corrects the transverse inclination phenomenon of the hull that occurs during the operation of the work crane (110) on a fish farm management vessel equipped with a work crane by the water pressure discharged from the first transverse inclination response part (300), thereby enabling safe aquaculture work to be performed through the work crane and ensuring the safety of the worker.

[0023] The above tilt sensor (200) is installed in the center of the hull (100) where the work crane (110) is installed, and is configured to measure the tilt of the hull (100) in one direction due to the load applied to the work crane (110).

[0024] At this time, it should be noted that the tilt sensor (200) may be configured to be connected to a transceiver (not shown) capable of transmitting the measured tilt information of the hull via wired or wireless means.

[0025] In addition, the first transverse inclination response part (300) is installed on the lower side of the hull (100) in the direction where the work crane (110) is installed, so as to selectively discharge the sucked-in water toward the outer direction of the hull or toward the underwater direction.

[0026] That is, when a heavy object is connected to the work crane (110) installed on the hull (100), the hull (100) tilts to one side due to the load of the heavy object. At this time, the first transverse inclination response unit (300) allows the tilted side of the hull to be lifted back to a horizontal position by high-pressure discharge of water sucked in by the operation signal received from the main control unit (800) in the underwater direction.

[0027] In addition, the main control unit (800) determines the tilt of the hull through the signal received from the tilt sensor (200) and transmits a discharge signal to the first transverse inclination response unit (300) to control the discharge of water from the first transverse inclination response unit (300) toward the outside of the hull.

[0028] That is, during the operation of the above-mentioned work crane (110), if the tilt of the hull is determined to be greater than a certain allowable value through the signal received from the above-mentioned tilt sensor (200), a driving signal is transmitted to the above-mentioned first transverse inclination response unit (300) so that the sucked water is discharged at high pressure in the underwater direction, thereby allowing the tilted direction of the hull to be lifted horizontally.

[0029] Additionally, the main control unit (800) may be configured to include a communication unit (810) for wired and wireless transmission and reception of signals, an inclination risk assessment unit (830) that determines the risk of transverse inclination of the hull by comparing the sensing value of the inclination sensor received by the communication unit (810) with normal data of the hull set in the data storage unit (820), and a drive control unit (840) that transmits a drive signal to the communication unit (810) for driving the transverse inclination response unit when it is determined to be in a dangerous state by the judgment of the inclination risk assessment unit (830).

[0030] At this time, the communication unit (810) may be configured to include a sensor communication interface (811) that receives hull tilt sensing data in real time from the tilt sensor (200), and a driving signal interface (812) that transmits a driving signal received through the driving control unit (840) to the transverse tilt corresponding unit.

[0031] Meanwhile, when water sucked in by the driving of the first transverse inclination response unit (300) is discharged into the water at high pressure, one side of the tilted hull is lifted horizontally, but in the process, a phenomenon occurs in which the hull is pushed toward the other side. Therefore, in the present invention, a second transverse inclination response unit (400) is installed on the lower side of the other side of the hull (100), so that when water is discharged into the water at high pressure from the first transverse inclination response unit (300), the second transverse inclination response unit (400) discharges water at high pressure toward the outside of the hull to prevent the hull from being pushed away.

[0032] The second transverse inclination response part (400) is installed on the lower side of the hull (100) to selectively discharge the sucked water in the direction of the outside or underwater direction of the hull, and is installed on the other side of the hull corresponding to the installation location of the first transverse inclination response part (300).

[0033] At this time, when the hull in the direction in which the second transverse inclination response part (400) is installed tilts, it is preferable that the second transverse inclination response part (400) discharges water sucked into the water at high pressure, and the first transverse inclination response part (300) discharges water sucked into the outside of the hull at high pressure.

[0034] That is, when the first and second transverse inclination response parts (300, 400) are installed on one side and the other side of the hull (100) and the tilt of the hull (100) is detected, the main control unit (800) controls the transverse inclination response part on one side to discharge water in the underwater direction and controls the transverse inclination response part on the other side to discharge water in the direction of the outside of the hull, so that the hull is not pushed out and only the tilted direction is lifted upward.

[0035] Here, it should be noted that the main control unit (800) may be connected to a display device (850), an alert unit (860) that allows the ship's operator and worker to recognize the ship's inclination risk condition, and a button unit (870) for driving the first and second inclination response units (300, 400).

[0036] Additionally, the first and second transverse inclination corresponding parts (300, 400) may be configured to include a drive motor section (500), a main case (600) connected to one side of the drive motor section (500) and having a rotating impeller (620) installed inside, and a discharge flow path guiding means (700) connected to a discharge hole (601) of the main case (600) to guide water sucked into the interior of the main case (600) to flow selectively toward the outside of the hull or in an underwater direction and be discharged.

[0037] Looking at this, the drive motor unit (500) is mounted on the inside of the vessel via a mounting bracket (510), and the main case (600) is installed to be connected to the drive motor unit (500), and a rotating impeller (620) is rotatably installed inside so as to suck in and discharge water from outside the vessel.

[0038] Here, the main case (600) is composed of a case cover (610) connected to the drive motor unit (500) so that the shaft axis (520) of the drive motor unit (500) is exposed, and a case body (630) mounted on the case cover (610) to accommodate the rotating impeller (620) which is rotatably connected to the shaft axis of the drive motor unit (500).

[0039] At this time, the case body (630) is formed with a hollow joint opening (631) for connecting to a conduit through which water sucked in from the outside of the ship flows, and a hollow discharge opening (632) that allows water rotated in the case body (630) to be discharged by the rotation of the rotating impeller (620).

[0040] Additionally, the discharge flow guide means (700) comprises a flow body (710) formed such that a horizontal discharge pipe (711) connected to the discharge port (632) on the outer circumference guides the sucked water to be discharged in the direction of the outer hull, and an underwater discharge pipe (712) guides the sucked water to be discharged in the direction of the underwater hull, and are spaced apart from each other at a certain distance along the outer circumference; a direction changer (720) rotatably installed inside the flow body (710) to guide the water flowing from the main case (600) to either the horizontal discharge pipe (711) or the underwater discharge pipe (712); a motor member (730) installed to be axially coupled to the upper part of the direction changer (720) to drive the direction changer (720) by a driving signal from the main control unit (800) to rotate the direction changer (720); and a motor member (730) coupled to the upper side of the flow body (710). It may be composed of a mounting cover (740) that prevents external exposure of the motor member (730) and the direction changer (720). At this time, it is preferable that a connection guide channel (713) connected to the discharge port (632) is formed in the Euro body (710), and a change channel (721) is formed in the direction changer (720) to guide water flowing in from the connection guide channel (713) toward the horizontal discharge pipe (711) or the underwater discharge pipe (712). At this time, it should be noted that a receiving part (not labeled) capable of receiving a driving signal may be formed in the motor member (730).

[0041] When examining the operating state of the present invention configured as described above, first, when a heavy load is applied to the work crane (110) installed on the hull (100), a transverse inclination phenomenon occurs in which one side of the hull in the direction where the work crane (110) is installed tilts, and the sensing data of the tilt sensor (200) is received by the communication unit (810) of the main control unit (800).

[0042] Subsequently, the inclination risk assessment unit (830) of the main control unit (800) compares the received sensing data with the safety allowance data stored in the data storage unit (820) of the main control unit (800) to determine whether the inclination of the hull (100) is in a safe state or a dangerous state.

[0043] When the inclination risk assessment unit (830) determines that the tilt of the hull is in a dangerous state, information of the dangerous state (signal sound or lamp lighting) is displayed on the notification unit (860) which is wired or wirelessly connected to the main control unit (800), so that the hull operator or worker can recognize it.

[0044] Then, when a hull operator or worker operates a button unit (870) that is wired or wirelessly connected to the main control unit (800), the drive control unit (840) of the main control unit (800) transmits a discharge signal of the water sucked into the first and second transverse inclination corresponding units (300, 400) through the drive signal interface (812) of the communication unit (810).

[0045] At this time, the drive control unit (840) controls the motor member (730) of the transverse inclination corresponding part located in the direction of the tilted hull to be driven so that both longitudinal sides of the switching path (721) formed in the direction switching part (720) of the discharge path guide means (700) are connected to the connecting guide path opening (713) of the path body (710) and the underwater discharge pipe (712), and controls the motor member (730) of the transverse inclination corresponding part located in the opposite direction of the tilted hull to be driven so that both longitudinal sides of the switching path (721) are connected to the connecting guide path opening (713) and the horizontal discharge pipe (711).

[0046] That is, the drive control unit (840) transmits a drive signal to each motor member of the first and second transverse inclination response units (300, 400) via the drive signal interface (812), so that water sucked in in the underwater direction is discharged at high pressure from the first transverse inclination response unit (300) on one side, and water sucked in in the outer direction of the hull is discharged at high pressure from the second transverse inclination response unit (400) on the other side, thereby allowing the tilted side portion to be lifted within a safe allowable limit without the hull being pushed away.

[0047] In addition, the tilt sensor (200) senses the tilt of the hull (100) in real time and transmits the sensing data to the communication unit (810) of the main control unit (800). The tilt risk assessment unit (830) continuously compares the sensing data received from the tilt sensor (200) with the safety allowance data stored in the data storage unit (820). When the tilt of the hull (100) enters a safe state, the drive control unit (840) stops the operation of the first and second transverse tilt response units (300, 400).

[0048] At this time, it would be desirable for the inclination risk assessment unit (830) to notify the ship operator or worker through the notification unit (860) that the inclination of the hull has entered a safe state.

[0049] Although specific embodiments of the present invention have been described in detail as above, those skilled in the art will be able to make various modifications without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the embodiments described above, but should be defined by the claims set forth below as well as equivalents thereof. Explanation of the symbols

[0051] 100: Hull 110: Work crane 200: Tilt sensor 300 1st transverse inclination response unit 400: Second transverse inclination response part 500: Drive motor part 600: Main Case 610: Case Cover 620: Rotary impeller 630: Case body 700: Discharge flow guide means 710: Flow body 720: Direction changer 730: Motor component 740: Mounting cover 800: Main control unit 810: Communications Department 820: Slope Risk Assessment Department 820: Data storage unit 840: Drive control unit 850: Display device 860: Notification unit 870: Button section

Claims

Claim 1 A tilt sensor (200) installed in the central part of the hull (100) where the work crane (110) is installed to measure the tilt of the hull (100); a first transverse inclination response part (300) installed on the lower part of one side of the hull (100) in the direction where the work crane (110) is installed to selectively discharge the sucked water in the direction of the outer side of the hull or the underwater direction; and a second transverse inclination response part (400) mounted on the lower part of the other side of the hull (100) to selectively discharge the sucked water in the direction of the outer side of the hull or the underwater direction. The system is configured to include a main control unit (800) that determines the tilt of the hull through a signal received from the tilt sensor (200) and transmits a discharge signal to the first transverse inclination response unit (300) to control the discharge of water from the first transverse inclination response unit (300) toward the outer direction of the hull (100); wherein, when the tilt of the hull (100) is detected while the first and second transverse inclination response units (300, 400) are installed on one side and the other side of the hull (100), the main control unit (800) controls the discharge of water from the transverse inclination response unit on one side toward the underwater direction and controls the discharge of water from the transverse inclination response unit on the other side toward the outer direction of the hull; and the main control unit (800) comprises a communication unit (810) for wired or wireless transmission and reception of signals, and to the communication unit (810) The system is configured to include an inclination risk assessment unit (830) that determines the risk of transverse inclination of the hull by comparing the received inclination sensor's sensing value with normal hull data set in the data storage unit (820), and a drive control unit (840) that transmits a drive signal for driving a transverse inclination response unit to the communication unit (810) when a dangerous state is determined by the judgment of the inclination risk assessment unit (830); the communication unit (810) is configured to include a sensor communication interface (811) that receives hull inclination sensing data from the inclination sensor (200) in real time, and a drive signal interface (812) that transmits a drive signal received through the drive control unit (840) to the transverse inclination response unit; and the first and second transverse inclination response units (300, 400) are configured to include a drive motor unit (500), andThe system is configured to include a main case (600) connected to one side of the drive motor unit (500) and having a rotating impeller (620) installed inside, and a discharge flow guide means (700) connected to a discharge port (601) of the main case (600) to guide water sucked into the interior of the main case (600) to flow selectively toward the outside of the hull or in the underwater direction and be discharged. The main case (600) is composed of a case cover (610) connected to the drive motor unit (500) so that the shaft axis (520) of the drive motor unit (500) is exposed, and a case body (630) mounted on the case cover (610) to accommodate the rotating impeller (620) which is rotatably connected to the shaft axis of the drive motor unit (500). The case body (630) has a hollow type for connecting to a conduit through which water sucked in from the outside of the ship flows. A joint member (631) and a hollow discharge port (632) are formed to discharge water rotated in the case body (630) by the rotation of the rotating impeller (620), and the discharge flow guide means (700) is connected to the discharge port (632) on the outer circumference and has a horizontal discharge pipe (711) that guides the sucked water to be discharged in the direction of the outer side of the hull and an underwater discharge pipe (712) that guides the sucked water to be discharged in the direction of the underwater side formed at mutually spaced intervals along the outer circumference, a flow body (710), a direction changer (720) that is rotatably installed inside the flow body (710) and guides the water flowing from the main case (600) to either the horizontal discharge pipe (711) or the underwater discharge pipe (712), and is installed to be axially coupled to the upper part of the direction changer (720) It comprises a motor member (730) that can rotate the direction changer (720) by being driven by a driving signal of the main control unit (800), and a mounting cover (740) that is coupled to the upper side of the Euro body (710) to prevent external exposure of the motor member (730) and the direction changer (720).A transverse inclination control system for a fish farm management vessel, characterized in that the above-mentioned Eurobody (710) has a connecting guide channel (713) connected to the above-mentioned discharge port (632), and the above-mentioned direction change port (720) has a switching channel (721) formed to guide water flowing in from the above-mentioned connecting guide channel (713) to flow in the direction of the horizontal discharge pipe (711) or the underwater discharge pipe (712). Claim 2 delete Claim 3 delete

Images