JP4490936B2 - Automatic water supply system for paddy fields - Google Patents

Description

The present invention relates to an automatic water supply apparatus for paddy fields.
More particularly, the present invention relates to an automatic water supply system for paddy fields that can prevent proper water supply adjustment from being hindered by dust such as dead leaves, vegetation, or muddy water, while having a simple structure that does not require a complicated link mechanism.

  Water management in paddy fields is important for the growth of good quality rice, and it is necessary to maintain and manage the water level at a certain height at a given time. Conventionally, water management has been performed by opening and closing the water supply channel drawn into the paddy field with a water stop plate, etc., and all this work relies on human hands. However, it is necessary to carry out this work finely several times every day, and it is a fact that a part-time farmer cannot handle the daily water level management.

Under such circumstances, in recent years, an automatic water supply apparatus that automatically supplies and stops agricultural water to paddy fields has been proposed. For example, as proposed in Patent Document 1, this device has an open / close valve that opens and closes a water supply port of a water supply channel, and a float that floats on a paddy field. The open / close valve and the float are connected by a link mechanism. It is common. The water level measured by the float is mechanically transmitted to the valve body of the on-off valve by a link mechanism so that the on-off valve can be automatically opened and closed according to the water level.
Registered Utility Model No. 3035996 (Figs. 1 and 2)

  In addition, although an automatic water supply device that electrically controls the supply and stop of agricultural water has been proposed, there are no power sources near the paddy field, or because of the drawbacks such as the risk of leakage and high equipment costs, There is a tendency to prefer automatic water supply devices that do not use electricity.

However, the automatic water feeder as proposed in Patent Document 1 has the following problems.
First, since a complicated link mechanism is used to connect the on-off valve and the float, if used in a paddy field for many years, a failure may occur in the link portion of the link and the rotation center shaft. It is easy to generate and maintenance is difficult including repair.

  In addition, garbage such as dead leaves, vegetation, and muddy water flows along with agricultural water. If neglected, water supply cannot be adjusted properly.

  More specifically, referring to Patent Document 1 (FIGS. 1 and 2), in the conventional automatic water supply apparatus, the valve body is provided on the irrigation channel side above the water supply port, and the water supply port is closed from above. It is like that. Therefore, when the water supply is stopped (see FIG. 1), dust such as dead leaves and vegetation is easily entangled with the valve body and the bellows member on the valve body. For this reason, when the valve body moves upward during water supply, the upward movement is likely to be hindered by entangled dust, and when the amount of dust is large, it may be difficult to move up and down. In Patent Document 1, a water surface dust removal member is installed to remove water surface dust, but it is not possible to remove even water waste.

  Furthermore, in the conventional automatic water supply apparatus, the valve body that has moved above the water supply port in the water supply state (see FIG. 1) remains essentially in the same position and swings in the left-right direction (horizontal direction). It is not structured. Therefore, there is a high possibility that dust is caught on the valve body during water supply or is caught between the valve body and the water supply port.

  In addition, in the conventional automatic water supply device, when relatively hard garbage such as a tree branch is caught between the valve body so as to cover a part of the water supply port, the garbage is difficult to come off due to the weight of the valve body from above. Water tends to leak from the water supply port 21 that should have been closed.

(Object of the present invention)
Accordingly, an object of the present invention is to provide an automatic water supply device for paddy fields that can prevent proper water supply adjustment from being hindered by garbage such as dead leaves, vegetation, or muddy water, while having a simple structure that does not require a complicated link mechanism. Is to provide.
Other objects of the present invention will become apparent from the following description.

  Means taken by the present invention to achieve the above object are as follows.

The present invention
A valve body casing having a water supply port on the upper side and having an opening provided toward the water surface of the paddy field on the lower side,
A spherical float valve body that is disposed on the water surface on the opening side , moves up and down in the valve body casing as the water level fluctuates, opens and closes the water supply port, and is not restricted in the rotational direction ;
With
The valve body casing has an inner wall formed so as to expand toward the opening, and is configured such that a gap between the float valve body and the inside of the valve body casing increases as the float valve body moves downward. And
In a state where the water supply opening is at least open, the float valve body is configured to be able to swing at least horizontally or along the water surface within the valve body casing.
It is an automatic water supply device for paddy fields.

The present invention
A water conveyance path installed between the water source and the paddy field;
Is directly or indirectly connected to the paddy field side of the conductor water passage, a water supply port for supplying water water source on the upper side, an opening that is provided toward the water surface of paddy fields in the lower side, toward the opening A valve body casing having an inner wall formed so as to expand ,
A spherical float valve body that is disposed on the water surface on the opening side, moves up and down in the valve body casing as the water level fluctuates, opens and closes the water supply port, and is not restricted in the rotational direction ;
Equipped with a,
In a state where the water supply opening is at least open, the float valve body is configured to be able to swing at least horizontally or along the water surface within the valve body casing.
It is an automatic water supply device for paddy fields.

It is said automatic water supply apparatus for paddy fields in which the inner wall of a valve body casing is formed in hemispherical shape .

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  In the present specification and claims, the term “paddy field” means an cultivated land that draws water to produce a crop, and the crop to be grown is not limited to paddy rice, such as lotus root and rush It is used as a broad concept including crops other than rice.

(Work)
The operation of the automatic water supply apparatus for paddy fields according to the present invention will be described. In addition, although the code | symbol used in drawing was described using the parenthesis in order to help understanding of description, each component is not limited to the thing of drawing description.
That is, when the water level of the paddy field (C) is appropriately maintained at the height desired by the farmer, the water supply port (21) of the valve body casing (2) (2b) is Closed. In this state, water is not supplied from the water supply port (21) to the paddy field (C).
When the water level of the paddy field (C) falls, the float valve element (3a) descends accordingly and opens (opens) the water supply port (21). Thereby, water is supplied from the water supply port (21) to the paddy field (C).
Thus, in the present invention, the float valve element (3a) measures the water level of the paddy field (C) and also functions as a valve element (a part of the on-off valve) for opening and closing the water supply port (21).

  Furthermore, in the present invention, the float valve body (3a) is configured to close the water supply port (21) from below. Therefore, even if debris such as dead leaves accumulates on the float valve body (3a) that closes the water supply port (21), the float valve body (3a) descends if the water level drops, and the dirt is also with the water. Easy to flow out.

Also provided with a valve body casing (2) (2b) having a water supply port (21) on the upper side and an opening (22) (22b) provided toward the water surface of the paddy field (C) on the lower side. What works is as follows.
When the water level of the paddy field (C) is appropriately maintained at the height desired by the farmer, the float valve body (3a) is used to supply water to the valve body casings (2) and (2b) as in the above invention. (21) is closed. In this state, water is not supplied from the water supply port (21) to the paddy field (C).
Then, when the water level of the paddy field (C) is lowered, the float valve body (3a) is lowered in the valve body casings (2) and (2b), and the water supply port (21) is opened. Thereby, water is supplied from the water supply port (21) to the paddy field (C). This water flows out from the opening (22) to the paddy field (C) through the gap between the inside of the valve body casing (2) (2b) and the float valve body (3a).

In a state where the water supply port (21) is at least open, the float valve body (3a) is configured to be able to swing at least horizontally or along the water surface in the valve body casing (2) (2b). The float valve element (3a) can be swung horizontally or along the water surface by the pressure of water flowing down from the water supply port (21). Therefore, this swing prevents dust such as dead leaves and vegetation from being caught on the float valve element (3a) or caught between the float valve element (3a) and the water supply port (21).
The float valve element (3a) may be configured to be able to swing with the water supply port (21) open, and may be configured to swing with the water supply port (21) closed. . In addition, “the state where the water supply port (21) is at least open” includes not only the case where the entire water supply port (21) is open, but also the case where at least a part of the water supply port (21) is open. Used in a broad sense.

  When the valve body casing (2) (2b) has inner walls (231) (231a) formed so as to expand toward the openings (22) (22b), the float valve body decreases as the water level decreases. Since the gap (S) between (3a) and the inside of the valve body casing (2) (2b) is widened, dust is caught or clogged between the float valve body (3a) and the valve body casing (2) (2b). Can be prevented.

In addition to the above-described function, the one provided with the spherical float valve element (3a) tends to smoothly discharge the dust discharged from the water supply port (21) without being caught by the float valve element (3a) . Since the float valve body (3a) is formed in a spherical shape, not only the water surface direction but also rotate in a vertical direction, not subjected to the rotational direction restricting. And since the trash flows down with the water from the water supply port (21), the float valve body (3a) rotates in the vertical direction, so that the trash is transferred from the water supply port (21) to the opening (22). It can be discharged smoothly.

(A) According to the present invention, the float valve body measures the water level of the paddy field and also acts as a valve body (a part of the on-off valve) that opens and closes the water supply port. Compared with the one in which the float and the on-off valve are connected by a link mechanism), the water supply can be adjusted appropriately while having a simple structure.
Furthermore, in the present invention, since the float valve body is configured to close the water supply port from below, even if dust such as dead leaves, vegetation, or muddy water accumulates on the float valve body that has closed the water supply port, When the sag drops, the float valve descends, and the trash tends to flow with the water. Therefore, it is possible to prevent the float valve element from being obstructed by accumulated dust as compared with the conventional one.
Thus, according to the present invention, it is possible to prevent proper water supply adjustment from being hindered by dust such as dead leaves, vegetation, or muddy water, while having a simple structure that does not require a complicated link mechanism.

(B) A valve body casing having a water supply port on the upper side and an opening provided on the lower side toward the water surface of the paddy field is provided, and the float valve is in a state where the water supply port is at least open. The structure in which the body can swing at least in the horizontal direction or along the water surface within the valve casing has the following effects.
That is, in the conventional automatic water supply apparatus, the valve body that has moved above the water supply port in the water supply state moves in the vertical direction (vertical direction) but does not move in the horizontal direction. Therefore, there is a high possibility that dust is caught on the valve body during water supply or is caught between the valve body and the water supply port.
On the other hand, in the present invention, as described above, when the water supply port is at least open, the float valve body can swing at least in the horizontal direction or along the water surface in the valve body casing. In contrast, the pressure of the water flowing down from the water supply port allows the water to flow while the float valve body is rocked at least in the horizontal direction or along the water surface. Therefore, it is possible to effectively prevent dust such as dead leaves and vegetation from being caught on the float valve body or being caught between the float valve body and the water supply port by this swinging.

(C) In the case where the valve body casing has an inner wall formed so as to expand toward the opening portion, the clearance between the float valve body and the inside of the valve body casing increases as the water level decreases. It is possible to prevent dust from being caught or clogged between the body and the valve body casing.

(D) A valve body casing having an inner wall formed in a hemispherical shape so as to expand toward the opening, and a water surface disposed on the opening side, and the inside of the valve body casing as the water level fluctuates. which includes a vertically movable to float valve body spherical shape that opens and closes the water supply port, a, in addition to the effects mentioned above, smoothly discharged dust discharged from the water supply port is not caught by the float valve body Easy to be.
In the present invention, since the float valve body is formed in a spherical shape that is not subject to the rotational direction restricting not only the water surface direction, also rotates in the vertical direction, it does not undergo a rotation direction restriction from the water supply port dust It can be smoothly discharged to the opening.

Hereinafter, although a reference example and an example explain the present invention, the present invention is not limited to these.

The present invention will be described in more detail based on reference examples and examples shown in the drawings.

Reference example 1

FIG. 1 thru | or FIG. 3 is explanatory drawing which shows the 1st reference example of the automatic water supply apparatus for paddy fields based on this invention.
FIG.1 and FIG.2 is side view partial sectional explanatory drawing which shows the use condition of the automatic water supply apparatus for paddy fields, FIG. 1 shows the state which has stopped the water supply to a paddy field, FIG. 2 shows the water supply to a paddy field It shows the state of going.
FIG. 3 is an explanatory plan view showing a state where the automatic water supply apparatus for paddy fields shown in FIG. 1 is viewed from above.

  As shown in FIG.1 and FIG.3, the automatic water supply apparatus A for paddy fields has the water guide pipe | tube 1 which is the water guide path | route installed between the water channel B and the paddy field C which are water sources, the water supply port 21, and the opening part 22 ( 1) and a float valve body 3 that moves up and down in the valve body casing 2 to open and close the water supply port 21. The valve body casing 2 constitutes a valve body receiving member having a water supply port 21 capable of supplying water to the paddy field C. Reference symbol D indicates a cocoon, reference symbol E indicates a rice seedling, and reference symbol C1 indicates an optimum water level.

In FIGS. 1 and 2, the water guide pipe 1, the valve body casing 2, and the water channel B excluding the float valve body 3 are mainly shown in cross section. The same applies to FIGS. 4 to 7 described later.
Hereinafter, each component of the paddy field automatic water supply apparatus A will be described in detail step by step.

(Water guide pipe 1)
As shown in FIG. 1, one side of the water conduit 1 passes through or passes through the eaves D and is connected to a water channel B as a water source, and the other side is drawn into the paddy field C to be connected to a valve body casing 2 (a connection pipe described later). 24). One end portion of the water guide pipe 1 (the side of the water channel B) is fixed in a penetrating manner to the side surface of the water channel B by a fixing tool 11 made of a bolt or a nut. In addition, when the water channel B is provided on the ridge D (illustration omitted), the water conduit 1 may be passed over the ridge D.

  The water guide pipe 1 can be formed by connecting the straight pipe 12 and the elbow 13 together. As the material of the water conduit 1, a pipe made of hard polyvinyl chloride is adopted, and the weight is reduced. In addition, it can also form with plastics other than hard polyvinyl chloride, a metal, or another material. Although not shown in the figure, a flexible hose having a multi-joint structure can also be adopted.

(Valve casing 2)
As shown in FIG. 1, the valve body casing 2 includes a casing body 23 formed in a hollow hemisphere having an opening 22 in the lower part (see also FIG. 4A described later). The casing main body 23 is attached with the opening 22 facing the water surface, and has a shape such that a ball used for cooking is turned upside down. An inner wall 231 (hereinafter referred to as “casing inner wall 231”) of the casing body 23 is formed in a hemispherical shape so as to expand toward the opening 22.

  In addition, the magnitude | size of the valve body casing 2 is designed so that the diameter of the opening part 22 may be set to about 50 cm. The magnitude | size of this valve body casing 2 is not specifically limited, According to the magnitude | size of the float valve body 3, etc., it sets suitably.

  As shown in FIG. 1, a water supply port 21 is provided in the ceiling portion of the casing body 23. The water supply port 21 is configured by one end portion (lower end portion) of a connection pipe 24 that is connected to the ceiling portion of the casing body 23 in a standing state. The other end (upper end) of the connecting pipe 24 is connected to the other end of the water guide pipe 1 (elbow 13). The casing main body 23 and the connecting pipe 24 are made of plastic and are reduced in weight. The casing main body 23 and the connecting pipe 24 can be formed of, for example, metal, wood, a combination thereof, or other materials.

  With the above configuration, the valve body casing 2 is connected to the paddy field C side of the water conduit 1, has a water supply port 21 on the upper side, and an opening 22 provided toward the water surface of the paddy field C on the lower side. have.

The valve body casing 2 is held on the water surface side by a water conduit 1 extending from above, but in addition, it is supported from the bottom of the paddy field C by a support member (not shown) such as a thin rod. May be. This is the same for the examples and reference examples described later.

(Float valve body 3)
As shown in FIG. 1, the float valve body 3 is formed in a substantially hemispherical shape, and the hemispherical surface is a smooth curved surface portion 31. The float valve body 3 is disposed on the water surface on the opening 22 side of the casing body 23. Further, as shown in FIG. 2, the float valve body 3 is formed in such a size that at least a part of the curved surface portion 31 of the float valve body 3 remains in the casing body 23 even when the water level is lowered. .

The float valve element 3 may be hollow or solid as long as it floats on the water surface due to buoyancy. The float valve body 3 can be formed of, for example, plastic (including soft synthetic resin), rubber, wood, a combination thereof, or other materials. This is the same for the examples and reference examples described later.

  On the periphery of the bottom of the float valve body 3, there is provided an overhanging portion 32 that is slightly overhanging like a collar of a hat. This overhanging portion 32 keeps the horizontal balance of the float valve body 3 on the water surface good, and effectively prevents the float valve body 3 from being reversed in the casing body 23. The overhang portion 32 can be omitted.

  The float valve body 3 moves upward in the valve body casing 2 as the water level of the paddy field C rises, and closes the water supply port 21 at the ceiling portion of the curved surface portion 31 as shown in FIG. In this state, water does not flow out from the water supply port 21 and water supply stops.

  Therefore, when the water supply is stopped, the paddy field automatic water supply device A is designed or installed in advance so that the water level of the paddy field C becomes the height desired by the farm worker. Specifically, the water level when water supply stops can be adjusted by changing the height of the casing body 23 to be installed and adjusting the position of the water supply port 21. The height of the casing body 23 can be appropriately adjusted by changing the length of the connection pipe 24 or the height of the water guide pipe 1 relative to the water bottom, for example.

In order to reliably stop water supply at an appropriate water level, it is preferable that the float valve body 3 strongly abuts the water supply port 21 from below at that water level. As a method of causing the float valve body 3 to strongly contact the water supply port 21, the buoyancy is adjusted by changing the weight or volume of the float valve body 3, or the height of the casing body 23 is changed to adjust the position of the water supply port 21. A method is mentioned.
Although not shown, an annular packing made of rubber or synthetic resin can be attached to the water supply port 21 to improve the adhesion to the float valve body 3.

  Further, in a state where the water supply port 21 is closed (see FIG. 1), the float valve body 3 is arranged to secure a required clearance S between at least the lower surface side of the curved surface portion 31 of the float valve body 3 and the casing inner wall 231. Is formed. The operation of this will be described later.

  Further, as shown in FIG. 2, the float valve element 3 moves downward in the valve element casing 2 as the water level of the paddy field C is lowered. However, as described above, at least a part of the curved surface portion 31 of the float valve body 3 remains in the casing main body 23 even when the water level is lowered, and the valve is opened from the lower opening 22 to the outside of the float valve body 3. The body casing 2 is prevented from coming out completely. This can be set as appropriate depending on the distance (height) of the opening 22 from the water bottom, in addition to the size of the float valve body 3 described above.

(Work)
The paddy field automatic water supply apparatus A according to the present reference example operates as follows.
When the water level of the paddy field C is appropriately maintained at a desired height, the water supply port 21 of the valve body casing 2 is closed by the float valve body 3 as shown in FIG. In this state, water in the irrigation channel B is filled in the water conduit 1 and the connection pipe 24 but does not flow out from the water supply port 21 to the paddy field C.

  Then, as shown in FIG. 2, when the water level of the paddy field C falls, the float valve body 3 descends in the valve body casing 2 and opens (opens) the water supply port 21 accordingly. Thereby, water is supplied from the water supply port 21 to the paddy field C. The water flows out from the opening 22 to the paddy field C through the gap S between the casing inner wall 231 and the curved surface portion 31 of the float valve element 3.

Thus, in this reference example, the float valve body 3 measures the water level of the paddy field C, and also acts as a valve body (a part of the on-off valve) that opens and closes the water supply port 21. Thereby, compared with the conventional automatic water supply apparatus (The float and the on-off valve which were each installed separately are connected with the link mechanism), water supply adjustment can be performed appropriately, although it is a simple structure.

  FIG. 4 is a partial cross-sectional explanatory view mainly showing an enlarged valve body casing for explaining how the dust flowing together with water is discharged from the opening.

In contrast to the conventional automatic water supply device (the valve body is provided on the water channel side above the water supply port and the water supply port is closed from above), in this reference example, as shown in FIG. The valve body 3 is arranged on the water surface side of the water supply port 21 and the water supply port 21 is configured to be closed from below. Therefore, as shown in FIG. 4 (a), even if dust F such as dead leaves accumulates on the float valve body 3 (in the connecting pipe 24) that temporarily closes the water supply port 21, if the water level drops, the float will float. The valve body 3 is lowered and the dust easily flows out together with the water. Therefore, it is possible to prevent the movement of the float valve body 3 from being obstructed by accumulated dust as compared with the conventional one.

Moreover, unlike the conventional automatic water supply apparatus in which the shaft portion protrudes from the tip of the valve body, in this reference example, the float valve body 3 is formed in a hemispherical shape, and the surface thereof is a smooth curved surface portion 31. Yes. Therefore, even in the water supply state shown in FIG. 2, the dust discharged from the water supply port 21 is easily discharged smoothly without being caught by the curved surface portion 31.

  Furthermore, in the conventional automatic water supply apparatus, the valve body that has moved above the water supply port in the water supply state remains at the same position and does not have a structure that swings in the left-right direction (horizontal direction). Therefore, there is a high possibility that dust is caught on the valve body during water supply or is caught between the valve body and the water supply port.

On the other hand, in this reference example, the float valve body 3 can swing in the water surface direction by the gap S formed between the casing inner wall 231 and the water supply state shown in FIG. Furthermore, the float valve body 3 can also rotate in the circumferential direction. Accordingly, unlike the conventional one, the float valve element 3 can pass water while shaking in the left-right or circumferential direction due to the pressure of the water flowing down from the water supply port 21. Therefore, it is possible to effectively prevent the dust F from being caught on the float valve body 3 or being caught between the float valve body 3 and the water supply port 21.

  Further, even if the amount of dust F passing through the gap S is large, as shown in FIG. 4B, the dust F pushed by the pressure of the water flowing down from the water supply port 21 causes the float valve body 3 to move to the other side ( Since it acts to widen the gap S by pushing toward the side where there is no dust G, it is possible to prevent the gap S from being clogged or pinched.

  In addition, in the conventional automatic water supply device, when relatively hard garbage such as a tree branch is caught between the valve body so as to cover a part of the water supply port, the garbage is difficult to come off due to the weight of the valve body from above. Water tends to leak from the water supply port 21 that should have been closed.

On the other hand, in this reference example, as shown in FIG. 4C, when garbage G is sandwiched so as to cover a part of the water supply port 21 (at least a part of the water supply port 21 is open). However, since there is a gap S between the casing inner wall 231 and the float valve body 3, the float valve body 3 can swing in the water surface direction within the valve body casing 2. As a result, the water flows from the gap S1 formed beside the dust, thereby increasing the water pressure in the portion. As a result, the float valve body 3 (shown by an imaginary line) is moved to the other side so as to expand the gap S1. Since it acts so as to be pushed, the trapped garbage G is easily discharged together with water.

  In addition, it is preferable to use a large diameter pipe for connecting the conduit pipe 1 and the casing main body 23 so that dust does not get caught.

As described above, according to this reference example, although it is a simple structure that does not require a complicated link mechanism, it prevents the entanglement or pinching of dead leaves, vegetation, or muddy water, etc. Adjustments can be made appropriately.

FIG. 5 shows a first embodiment of an automatic water supply apparatus for paddy fields according to the present invention, and is a side sectional partial cross-sectional explanatory view showing a use state thereof.
In addition, the same code | symbol is attached | subjected and shown to the same or equivalent location as the said reference example 1. FIG. Moreover, about the location demonstrated in the reference example 1, description is abbreviate | omitted and difference is mainly demonstrated. This is the same for the reference example described later.

Unlike the reference example 1 (refer FIG. 1), in the automatic water supply apparatus A2 for paddy fields which concerns on a present Example, the float valve body 3a is formed in the spherical shape. Thereby, in the water supply state shown in FIG. 5, the float valve element 3a rotates not only in the water surface direction and the circumferential direction but also in the vertical direction, and is not limited in the rotation direction. The water supply port 21 is located above the float valve body 3a, and the dust flows down from the water supply port 21 together with the water. Therefore, the float valve body 3a rotates in the vertical direction, so that the dust is supplied to the water supply port 21. Can be smoothly discharged to the opening.

Furthermore, since it is spherical, when the float valve body 3a is formed with the same diameter as the float valve body 3 shown in Reference Example 1 (see FIG. 1) (not shown), it is more than the opening 22 of the valve body casing 2. The float valve body 3a can be protruded to a low position. Therefore, it can be suitably used for the paddy field C having a deeper bottom.

Other configurations, operations, and effects are substantially the same as those of the above-described reference example, and thus description thereof is omitted.

Reference example 2

FIG. 6 shows a second reference example of the paddy field automatic water supply apparatus according to the present invention, and is a side cross-sectional explanatory view showing the use state thereof.
In the paddy field automatic water supply apparatus A3 according to the present reference example, unlike the reference example 1 (see FIG. 1), the float valve body 3b is formed in a substantially conical shape, and the casing body 23b of the valve body casing 2b is also correspondingly formed. The upper side outer shape is formed in a substantially conical surface shape (the whole is a shade shape).

  Specifically, the ceiling portion 33 of the float valve body 3 b that closes the water supply port 21 is formed in a planar shape essentially in parallel with the bottom surface portion 34. The casing inner wall 231b is formed so as to expand toward the opening 22b. Thereby, the lower the water level is, the more the gap S between the float valve body 3b and the casing inner wall 231b is expanded, and it is possible to more effectively prevent dust from being caught or clogged.

  In addition, the peripheral part side of the ceiling part 33 of the float valve body 3b can also be formed in a curved surface shape or roundness so that a corner may not be formed. Moreover, if the water supply port 21 can be closed, the ceiling part 33 can also be formed in a mountain shape so that a front-end | tip part may sag.

Other configurations, operations, and effects are substantially the same as those of the above-described reference example, and thus description thereof is omitted.

Reference example 3

FIG. 7 shows a third reference example of the paddy field automatic water supply apparatus according to the present invention, and is a side cross-sectional explanatory view showing a use state thereof.
Unlike the reference example 1 (refer FIG. 1), in the automatic water supply apparatus A4 for paddy fields concerning this reference example, the float valve body 3c is formed in a block shape, and the valve body casing 2c which has the opening part 22c according to it is formed. The casing main body 23c also has an upper outer shape formed in a box shape. In this reference example, the float valve body 3c is formed in a rectangular parallelepiped shape, but may be formed in a cube.

According to this reference example, the ceiling portion 33c of the float valve body 3c that closes the water supply port 21 is formed to be wide and flat like the bottom surface portion 34c, so that the water supply port 21 is reliably closed when the water supply is stopped. be able to.

Other configurations, operations, and effects are substantially the same as those of the above-described reference example, and thus description thereof is omitted.

  Note that the terms and expressions used in the present specification are merely explanatory and are not restrictive, and do not exclude terms and expressions equivalent to the above terms and expressions. The present invention is not limited to the illustrated embodiment, and various modifications can be made within the scope of the technical idea.

  Further, in the claims, the reference numerals used in the drawings are described in parentheses in order to facilitate understanding of the contents of the claims, but the claims are not limited to those described in the drawings. Absent.

The 1st reference example of the automatic water supply apparatus for paddy fields concerning the present invention is shown, it is side view partial section explanatory view showing the use state of the automatic water supply apparatus for paddy fields, and the state which has stopped water supply to a paddy field Is shown. It is side view fragmentary sectional explanatory drawing which shows the use condition of the automatic water supply apparatus for paddy fields, and has shown the state which is supplying water to a paddy field. Plan view explanatory drawing which shows the state which looked at the automatic water supply apparatus for paddy fields shown in FIG. 1 from the top. Partial cross-sectional explanatory drawing which mainly expanded the valve body casing for demonstrating how the garbage which flowed with water is discharged | emitted from an opening part. The 1st Example of the automatic water supply apparatus for paddy fields based on this invention is shown, Side view partial cross section explanatory drawing which shows the use condition. The side reference partial cross-section explanatory drawing which shows the 2nd reference example of the automatic water supply apparatus for paddy fields which concerns on this invention, and shows the use condition. The side reference partial cross-section explanatory drawing which shows the 3rd reference example of the automatic water supply apparatus for paddy fields which concerns on this invention, and shows the use condition.

A to A4 Paddy field automatic water supply system B Water channel C Paddy field C1 Optimum water level D Ｅ E Paddy rice F Garbage G Garbage S, S1 Clearance 1 Water conduit 2, 2b, 2c Valve body casing 3-3c Float valve body 11 Fixing tool 12 Straight Pipe 13 Elbow 21 Water supply ports 22 and 22b Openings 23 to 23c Casing body 24 Connection pipe 31 Curved portion 32 Overhang portions 33 and 33c Ceiling portions 34 and 34c Bottom portions 231 and 231b Casing inner wall

Claims (3)

A valve body casing (2) (2b) having a water supply port (21) on the upper side and an opening (22) (22b) provided on the lower side toward the water surface of the paddy field (C);
The direction of rotation , which is disposed on the water surface on the opening (22) (22b) side , opens and closes the water supply port (21) by moving up and down in the valve body casing (2) (2b) as the water level fluctuates A spherical float valve body (3a) that is not restricted by
With
The valve body casing (2) (2b) has inner walls (231) (231a) formed so as to expand toward the openings (22) (22b), and the float valve body (3a) moves downward. Accordingly, the gap (S) between the float valve body (3a) and the inside of the valve body casing (2) (2b) is configured to widen,
In a state where the water supply port (21) is at least open, the float valve body (3a) is configured to be able to swing at least horizontally or along the water surface in the valve body casing (2) (2b).
Automatic water supply device for paddy fields. A water conduit (1) installed between the water source (B) and the paddy field (C),
Connected directly or indirectly to the paddy field (C) side of the water conduit (1), the water supply port (21) for supplying water from the water source (B) on the upper side, and the water surface of the paddy field (C) on the lower side is that the opening provided toward the (22) and (22b), said opening (22) inner wall (231) which is formed so as to extend toward the (22b) (231a) valve casing having a (2) (2b)
The direction of rotation , which is disposed on the water surface on the opening (22) (22b) side, opens and closes the water supply port (21) by moving up and down in the valve body casing (2) (2b) as the water level fluctuates A spherical float valve body (3a) that is not restricted by
Equipped with a,
In a state where the water supply port (21) is at least open, the float valve body (3a) is configured to be able to swing at least horizontally or along the water surface in the valve body casing (2) (2b).
Automatic water supply device for paddy fields. The automatic water supply apparatus for paddy fields according to claim 1 or 2, wherein the inner wall (231) of the valve body casing (2) is formed in a hemispherical shape .

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