Background Art A water gate for controlling an upstream pondage is installed to a waterway or a canal, considering a flood control function, a security of agricultural water or an appearance of an upper stream in the waterway. A various kind of the water gate are disclosed in the prior art, and an operating method thereof is also as such. In most water gate, a water gate body is disposed between concrete support structures constructed along both sides of a river with a predetermined distance, and an upper or lower part of this water gate body is rotatably coupled to the support structure using a shaft. And, the water gate body is rotated about the shaft by a motor or cylinder so that the waterway is opened or closed to adjust the upstream pondage.

However, since most of the water gate uses the motor weal to water, a malfunction is frequently occurred. In case of the cylinder, foreign matters such as a waterweed and sand enter into the cylinder so that the malfunction is occurred. In addition, the water gate could not be fully opened due to a deposit such as sand and

gravels stacked near the lower part of the water gate, so that the water gate loses its own function.

Further, the water gate in the prior art is only directed to the function for opening and closing the waterway, so that it is required for the water gate to allow a free movement of the fish or to improve the water quality.

Disclosure of Invention The present invention is contemplated to solve the aforementioned problem, and it is an object of the present invention to provide an provide a water gate having the multi-stage discharge system, in which opening and closing means is installed so as to opening and closing a water gate body easily and durably without any malfunction, an independent fish way is formed in a lower part of the water gate and allows a fish to freely move from a downstream to an upstream so as to seek to preserve an ecosystem, a stack of sand and gravels near the lower part of the water gate is prevented so as to easily open or close the water gate body, a plurality of the water gate bodies are configured to continuously installed without additional columns installed between the water gate bodies for supporting the water gates so that the constructing cost is significantly decreased, and a plurality of discharge holes are formed in the upper and lower part of the water gate and thus underwater contaminants could be discharged while the water gate is closed so that a water quality is improved.

To accomplish the above object, the present invention provides an automatic water gate having a multi-stage discharge system comprising: Supporters constructed along both sides of a waterway with a predetermined distance; a water gate body having a shape of a hollowed square plate and being disposed with an inclination between the

supporters, wherein a lower part of the water gate body is rotatably coupled with the supporters by a center shaft; a sealed space extending in an upper and a lower directions and being formed near both ends in width direction of the water gate body; and a cylinder being disposed into the sealed space in an upper and a lower directions, wherein an upper end of the cylinder is rotatably coupled to a bracket fixed to an upper side of the sealed space using a pin, and a lower end of the cylinder is rotatably coupled to one end of a link of which the other end is connected to the center shaft, so that the water gate body rotates about the center shaft by expanding and contracting the cylinder.

Fish ways opened to the water discharging side are formed in the water gate body, and each fish way is configured to be opened and closed by a fish way opening and closing plate that is operated by a motor.

A discharge path is formed extending from a lower part of the water storing side in the water gate body, through the upper part of the water gate body to a lower part of the water discharging side of the water gate body, and an entrance of the path in the water storing side is closed by a plate when the water gate body is opened.

A discharge path is formed from the upper part to the lower part of the water discharging side, and an upper entrance of the path is closed by a plate when the water gate body is opened.

A fish way is formed through the lower part and the water storing side of the water gate body, and a fish way entrance in the water storing side is closed by a plate which is operated by a motor when the water gate body is opened. a plurality of water gates are installed to be connected with each other between the supporter, and an isolation plate is formed perpendicular to the water gate body toward the water storing side, at a connection portion of each water gate body so that no

gap is made between opened and closed water gate bodies.

In addition, the present invention provides an automatic water gate having a multi-stage discharge system comprising: Supporters constructed along both sides of a waterway with a predetermined distance; a water gate body having a shape of a hollowed square plate and being disposed with an inclination between the supporters, wherein either a lower part or an upper part of the water gate body is rotatably coupled with the supporters by a center shaft; and multi staged discharge holes being formed at the upper and lower parts of the water gate body through water storing and discharging sides, wherein the discharge holes are covered with a mesh member and opened and closed by a opening and closing means.

The opening and closing means comprises a plurality of plates disposed to cover the discharge holes in a common horizontal plane respectively; a rod connecting each plate in the common plane; and a cylinder for moving the rod repeatedly in a horizontal direction.

As mentioned above, a cylinder for opening and closing a water gate body is installed in a sealed space of the water gate body, so that a possibility for a malfunction of the cylinder by foreign objects is greatly decreased. Therefore a water gate body is opened and closed easily and durably without any malfunction.

An independent fish way is formed in a lower part of the water gate and allows a fish to freely move from a downstream to an upstream so as to seek to preserve an ecosystem.

Discharge paths are formed at an upper and a lower part of the water discharging side in the water gate body, and thus a stack of sand and gravels near the lower part of the water gate is prevented so as to fully open or close the water gate body. Further, a

plurality of the water gate bodies are configured to be continuously installed without additional columns installed between the water gate bodies for supporting the water gates so that the constructing cost is significantly decreased.

A plurality of discharge holes are formed in the upper and lower part of the water gate and thus underwater contaminants could be discharged while the water gate is closed so that a water quality is improved.

Brief Description of Drawings The features and advantages of the present invention will be more described specifically in the following description of preferred embodiments of the invention with reference to the accompanying drawings wherein: Fig. 1 is a front view showing an automatic water gate having a multi-staged discharge system according to a first embodiment of the present invention; Figs. 2 and 3 are sectional views taken along a line A-A of Fig. 1 showing an operation status of the automatic water gate having the multi-stage discharge system; Fig. 4 is a plane view of Fig. 1; Figs. 5 and 6 are sectional views taken along a line B-B of Fig. 1 showing an operation status of a plate for opening and closing a fish way; Figs. 7 and 8 are perspective views showing a water storing status of the automatic water gate having the multi-staged discharge system according to the first embodiment of the present invention; Figs. 9 and 10 are sectional views showing the operating status of the automatic water gate having the multi-staged discharge system according to a second embodiment of the present invention;

Figs. 11 and 12 are sectional views showing the operating status of the automatic water gate having the multi-staged discharge system according to a third embodiment of the present invention; Fig. 13 is a perspective view showing the automatic water gate having the multi- staged discharge system according to a fourth embodiment of the present invention; Fig. 14 is a perspective view showing the operating status of the automatic water gate having the multi-staged discharge system according to the fourth embodiment of the present invention; Fig. 15 is a perspective view showing the automatic water gate having the multi- staged discharge system according to a fifth embodiment of the present invention; and Fig. 16 is a sectional view showing the operating status of discharge holes in the automatic water gate having the multi-staged discharge system according to the fifth embodiment of the present invention.

Best Mode for Carrying Out the Invention Reference will now be made in detail to the embodiment of the present invention and examples of which are illustrated in the accompanying drawings. In explaining the present invention, the same names and reference numerals will be given to the same components, and explanations in the same will be omitted.

Fig. 1 illustrates a front view showing an automatic water gate according to a first embodiment of the present invention, Figs. 2 and 3 illustrate sectional views taken along a line A-A of Fig. 1 showing an operation status of the automatic water gate, Fig. 4 illustrates a plane view of Fig. 1, and Figs. 5 and 6 illustrate sectional views taken along a line B-B of Fig. 1 showing an operation status of a plate for opening and closing a fish

way, respectively.

The automatic water gate of the present invention AW is disposed with an inclination between supporters 100 of concrete structure built along both sides of a waterway with a predetermined distance, in the same way as the prior art.

A water gate body 1 is a hollowed square plate, a center shaft 2 is rotatably coupled with a sleeve 2a fixed in a lower part of the water gate body 1, and both ends of the center shaft 2 is coupled with a shaft supporter 3 fixed on a bottom. The shaft supporter 3 is fixed to a lower part of the supporter 100, and additionally disposed with a predetermined distance, depending on a length of the water gate body 1.

The water gate body 1 could rotate about the center shaft 2 by a structure mentioned above.

A sealed space la extending in an upper and a lower direction is formed near both ends in width direction of the water gate body 1 respectively, and a cylinder 4 is disposed in the upper and lower direction into the sealed space la.

An upper end of the cylinder 4 is rotatably coupled to a bracket lb fixed to an upper side of the sealed space la using a pin 4a, and a lower end of the cylinder 4 is rotatably coupled to one end of a link 5 of which the other end is connected to the center shaft 2, using the pin 4a.

With such structure, when the cylinder 4 expands and contracts, the water gate body 1, as shown in Figs. 2 and 3, rotates about the center shaft 2 so as to open and close the waterway. During this operation, since the cylinder 4 is accommodated in the sealed space la of the water gate body 1, the cylinder 4 does not break down by foreign matters.

In such operation, when the water gate body 1 is closed as shown in Fig. 4, a side surface of the water gate body 1 in water discharging direction is supported by a wedge 7

operated by the cylinder 6 and thus the closing status of the water gate body 1 is securely maintained.

Fish ways 8 configured to be opened to the water discharging side are formed between both sealed spaces 1 a of the water gate body 1. And the Fish ways 8 are formed to parallel and space apart from each other with a predetermined distance in the upper and lower direction.

As shown in Figs. 5 and 6, each fish way 8 is configured to be opened and closed by a fish way opening and closing plate 10 that is operated by a motor 9, and a support member 11 made of a flexible material such as a fabric or a rope which helps the fish to move from the water discharging side to water storing side, is fixed to the plate 10. a length of the support member 11 is not limited.

The fish way 8 is formed in the water gate body 1 as such so that an opening and closing of the plate 10 is available independently while the water gate 1 is closed.

Therefore, such fish way 8 enables the movement of the fish to the upstream so that the ecosystem could be preserved.

In the present embodiment, as shown in Fig. 7, a packing 12 is fixed to an edge of the water discharging side in the water gate body 1, and this packing 12 is stuck to a water gate frame 110 which is fixedly formed in the supporter 100 in order to achieve a watertight status. Alternatively, as shown in Fig. 8, the packing 12 is fixed to the water gate frame 110 in the supporter 100, and this packing 12 is stuck to the edge of the water gate body 1 in order to achieve a watertight status.

A reference numeral S not described above is a mainstay which is fixed to a front side of the water gate body 1 to safely support the opened water gate body 1.

Figs. 9 and 10 are sectional views showing the operating status of the automatic

water gate having the multi-staged discharge system according to a second embodiment of the present invention.

In the present embodiment, a discharge path 13 is formed extending from a lower part of the water storing side in the water gate body 1, through the upper part of the water gate body 1 to a lower part of the water discharging side of the water gate body 1, and an entrance 13a of the path 13 in the water storing side is opened and closed by a plate 14.

As shown in Fig. 9, when the water gate body 1 is closed, the plate 14 is opened by its own weight, and as shown in Fig. 10, when the water gate body 1 is opened, the entrance 13a is closed by the plate 14.

As the path 13 is formed as mentioned above, water near the lower part of the water storing side could move to the lower part of the water discharging side when the water gate body 1 is closed, in order to prevent the water near the lower part of the water storing side from being accumulated and corrupted. When the water gate body 1 is opened, the plate 14 keeps on closing the entrance 13a of the path 13 so that the path 13 is not clogged by sand and gravels.

In the present embodiment, a discharge guide plate 15 is installed to be spaced apart from the water discharging side of the water gate body 1 with a predetermined distance, a discharge path 16 is formed by this plate 15 from the upper part to the lower part of the water discharging side, and as shown in Fig. 10, an upper entrance 16a of the path 16 is closed by a plate 17 when the water gate body 1 is closed.

As the path 16 is formed from the upper part to the lower part of the water discharging side as mentioned above, a part of water flowing over the water gate body 1 drops down to the lower part of the water gate body 1 through the discharge path 16 when the water gate body 1 is closed. Therefore, the dropped water prevents the sand and

gravels from being stacked near the lower part of the water gate body 1 by its water pressure so that the water gate body 1 could be opened smoothly. When the water gate body 1 is opened, the plate 17 keeps on closing the discharge path 16 so that the path 16 is not clogged by sand and gravels.

Figs. 11 and 12 are sectional views showing the operating status of the automatic water gate having the multi-staged discharge system according to a third embodiment of the present invention.

In the present embodiment, a fish way 18 is formed through the lower part and the water storing side of the water gate body 1, and a fish way entrance in the water storing side is closed by a plate 20 which is operated by a motor 19 when the water gate body 1 is opened.

A support member 21 made of a flexible material such as a fabric or a rope which helps the fish to move from the water discharging side to water storing side, is fixed to the plate 20.

The fish way 18 is formed at the lower part of the water gate body 1 as such, so that this fish way 18 enables the movement of the fish to the upstream to preserve the ecosystem even though the water gate body 1 is closed.

Fig. 13 illustrates a perspective view showing the automatic water gate having the multi-staged discharge system according to a fourth embodiment of the present invention, and Fig. 14 illustrates a perspective view showing the operating status of the automatic water gate having the multi-staged discharge system according to the fourth embodiment of the present invention, respectively.

In the present embodiments, a plurality of water gates 1 are installed to be connected with each other between the supporter 100, and an isolation plate 22 is formed

perpendicular to the water gate body 1 toward the water storing side, at a connection portion of each water gate body 1, that is both ends of the water gate body 1. It is preferable that a water proofing member 22a is inserted between the connecting portions closely adhered to each other.

In such water gate bodies 1 according the present invention, although several water gate bodies 1 are opened as shown in Fig. 14, no gap is made between opened and closed water gate bodies 1 because of the isolation plate 22. Accordingly, even though the water gate bodies 1 are installed to be connected, it is not necessary to install additional column between the water gate bodies 1 to support the water gate 1, and thus the installation cost could be significantly decreased.

Fig. 15 illustrates a perspective view showing the automatic water gate having the multi-staged discharge system according to a fifth embodiment of the present invention.

In the present embodiment, the supporters 100 are built along both sides of a waterway with a predetermined distance, the water gate body 1 of a hollowed square plate is disposed with an inclination between the supporters 100, a center shaft 23 rotatably coupled to the supporters 100 is fixed to the upper part of the water gate body 1, and the center shaft 23 is configured to rotate by a cylinder 24 so that the lower part of the water gate body 1 is opened and closed with ascending and descending about the center shaft 23 by an operation of the cylinder 24. Such features are identical with those disclosed in the prior art.

In the present embodiment, multi staged discharge holes 25 is formed at the upper and lower parts of the water gate body 1 through the water storing and discharging sides, and these discharge holes 25 are covered with a mesh member 26 and

simultaneously opened and closed by a opening and closing means 27. Sizes of the discharge holes 25 are different according to their heights. This is to make an upper portion of water flowing in from the upstream to stay near the water gate and to keep layers in a lower portion of the water to be maintained horizontally according to the materials contained in the water, and thereby to discharge the lower layers having heavy a specific weight.

As shown in Fig. 16, the opening and closing means 27 includes a plurality of plates 27a disposed to cover the discharge holes 25 in a common horizontal plane respectively, a rod 27b connecting each plate 27a in the common plane and a cylinder 27c for moving the rod 27b repeatedly in a horizontal direction.

Due to such the opening and closing means 27, when the cylinder 27c expands and contracts, the plate 27a closes and opens the discharge holes 27 with moving horizontally. Therefore, water of the water storing side could be discharged with the water gate body 1 being closed so as to prevent the water near the lower part of the water storing side from be stayed and corrupted, and contaminants deposited in water could be discharge so as to improve the water quality.

In the meantime, in the present embodiment, a plurality of plate 28 for decreasing a water pressure is installed perpendicularly on the water storing side of the water gate body 1 to aid the fish to move from the downstream to the upstream, and a support member 29 made of a flexible material such as a fabric or a rope is fixed to a rear surface of the plate 28, that is a water discharging side of the plate 28 in case that the water gate body 1 is closed. In addition, a plurality of handles 30 for saving a life, are installed in wide direction to the water storing side of the water gate body 1.

Although a number of embodiment have described in the above specification, it

should be apparent that the present invention could be embodied in many other specific mode included within the sprit and scope of the present invention. Thus, the present embodiments should be considered as illustrative, and the present invention could be modified within the scope of claims and the equivalent thereof.

The Industrial Applicability In the present invention, a cylinder for opening and closing a water gate body is installed in a sealed space of the water gate body, so that a possibility for a malfunction of the cylinder by foreign objects is greatly decreased. Therefore a water gate body is opened and closed easily and durably without any malfunction, An independent fish way is formed in a lower part of the water gate body and allows a fish to freely move from a downstream to an upstream so as to seek to preserve an ecosystem.

Discharge paths are formed at an upper and a lower part of the water discharging side in the water gate body, and thus a stack of sand and gravels near the lower part of the water gate is prevented so as to fully open or close the water gate body. Further, a plurality of the water gate bodies are configured to continuously installed without additional columns installed between the water gate bodies for supporting the water gate body so that the constructing cost is significantly decreased.

A plurality of discharge holes are formed in the upper and lower part of the water gate body and thus underwater contaminants could be discharged while the water gate is closed so that a water quality is improved.