JPS59109122A - Automatic water supply apparatus for rice field - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic water supply device for rice fields that has a simple structure and can automatically perform intermittent irrigation of rice fields.

(1) Traditionally, irrigation of rice fields has progressed from so-called diversion irrigation, in which water is constantly supplied from the water source and drained from the bottom of the water, to so-called intermittent irrigation, which has targets for stopping and starting water supply depending on the growing season. However, as the number of part-time businesses has increased in recent years, proper management has become difficult.Water supply is concentrated during the day, resulting in water shortages, while water supply is stopped all at once at night. Accidents such as irrigation canals overflowing have occurred. As labor saving progresses further,
Not only is a return to so-called diversion irrigation resulting in a decline in productivity, but water pollution due to the runoff of nitrogen and phosphorus contained in farmland drainage has become a social problem. Although an automatic water supply port is necessary, such a water supply 1-1 has not been put into practical use except for those used at the ends of pipes, which are few in number.

Therefore, we would like to provide a device that performs fully automatic (2) intermittent irrigation in Japan's most common open channel system of rice field irrigation, in an attempt to solve the problems listed in 2.

The mechanism and operating conditions will be explained below.

A water supply port main body 3 is placed on the ridge between the irrigation canal 1 and the rice field 20, an operating device 16 is installed in the vicinity of the water supply port body 3 in the rice field, and both are connected by a single trachea 25.

The water inlet main body 3 is composed of a door body 4 and a counterweight on the opposite side thereof, which are rotatably supported by a frame body by an arm and a shaft. There is a screen 9 and a trap door 10 upstream of the water supply facility 6.
is provided, and the trap door 10 is submerged in water to the extent that it does not significantly impede the water flow to prevent waves from entering from the waterway 1.

The structure of the door body 4 includes a partition plate 16 between an upstream plate 11 and a downstream plate 12, and the partition plate 13 is evenly provided with water discharge holes 14 that pass through the partition plate 13, and the top and sides are sealed. Therefore, if the end of the door body 4 is immersed in running water, not only will there be a water level difference between upstream and downstream due to the resistance of the door body, but also a water vein from the water discharge hole 14 will occur. As a result, the air inside the door body is removed, a siphon action occurs, and the negative pressure acts on the top plate 15 to close the door body. However, if air is supplied from the ventilation pipe 26, the negative pressure will not develop and the door will open fct\. Furthermore, it is possible to release the negative pressure and open the door body 4 after it has been closed due to negative pressure, as long as the weight is adjusted appropriately. In this way, in order to keep the door body 4 in its open/closed state 17 or to perform a new opening/closing operation on the door body 4, it is sufficient to operate whether or not the ventilation pipe 26 is ventilated.

Next, regarding the operating device that determines whether or not there is ventilation, the water level is said to be the same as in the rice fields. 1. An air supply pipe 21 is opened at a position adjacent to this and opened at a predetermined height in the operation picture 18, and both are communicated by a water supply stop water level adjustment pipe 20 and a water supply start water level adjustment pipe 22. Furthermore, at the time of starting the zero ventilation that is connected to the ventilation pipe 26, there is no water in the operation screen 18, so the inside of the door body 4 is in communication with the atmosphere, and the door body 4 is raised and fully opened by the stopper 26. The solid line in FIG. 1 indicates this state, and the water level in the rice field in this case is line C shown in FIG.

In this state, as the water supply continues and the water level in the rice field rises, the water level in the water supply pipe 19 and the water supply stop F water level control pipe 20 connected to it rises, but the water level reaches the top of the water supply stop water level control pipe 20. When the water reaches the air supply pipe 2, water enters the operation 18 through the water supply start adjustment pipe 22 and the air supply pipe 21.
1 is submerged in water, and the inside of the door body 4 communicating with it through the ventilation pipe 25 is cut off from the atmosphere.

Therefore, the air that is removed from the door body by the flowing water is not supplied, so the water level inside the door body 4 rises rapidly and negative pressure increases, so the top plate 15 is pulled and the door body 4 closes to stop the water supply. Even in the fully closed state, the bottom opening of the door body 4 is dammed so that it is completely submerged in water, so the negative pressure remains and the door body maintains its fully closed state. . Since this negative pressure extends to the other end of the a-trachea 23, water enters the inside of the ventilation pipe 23, creating a complete siphon effect between the water passage pipe 19 and the water supply pipe 21.
.

Next, as the water level in the paddy field becomes low due to water consumption, the water level of the operation hook 18 also becomes water [11 The surface water level of the paddy field 17 is completely linked with the water level]! When the air supply pipe 21 is lowered to the position , the lower end of the air supply pipe 21 is exposed in the air, the negative pressure inside the door body 4 is eliminated, and the gate is opened again, and the arm 6 is opened until it comes into contact with the stopper 26 to start and continue water supply.

In this way, this machine has a very simple structure and fully automates water supply in an economical manner, which not only saves labor but also improves land productivity and prevents water pollution, bringing great convenience to society. It is provided to

[Brief explanation of drawings]

FIG. 1 is a sectional view of the main body of the water supply device, FIG. 2 is a sectional view of the detection and operation mechanism, and FIG. 3 is an overall plan view. 1 Irrigation channel, 2 Water In53 device body, 4 Door body, 5 Art, 6 Axis, 7 Frame body, 8 Weight, 9 Screen, 17 Water level detection, 18
Operation picture, 19 water pipe, 21 air supply pipe, 23 ventilation pipe. Patent applicant Toyokawa Kogyo Co., Ltd.

Claims (1)

[Claims] 1) Part or all of the door body 4 of the balance gate has a siphon structure, and the ventilation pipe 23 that opens at the top of the siphon is placed at a position corresponding to the F-limit water level of the service water within the operation screen 18 that is cut off from the outside water level. A water pipe 19 opened at a position lower than the field surface in the water level detection device 17, which is connected to the air supply pipe 21 opened at the water level and communicated with the outside water level, is connected to the air supply pipe 21 at a height corresponding to the upper limit water level of the irrigation water. Automatic water supply device for paddy fields.