JPH076764Y2 - Watering device - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention sprays water over a wide area such as fields, roads, vinyl houses, orchards, golf courses, and civil engineering sites for irrigation and snow removal. The present invention relates to a watering device suitable for.

(Prior Art) An example of this water sprinkling device is shown in FIG. 2, and 01 is a sprinkling pipe, which is piped all over a sprinkling area of a wide area. The base end of the water sprinkling pipe 01 is connected to a water pump (not shown), and a large number of nozzles 02 are bored along the longitudinal direction over the entire length thereof at predetermined intervals.

Then, at the time of water sprinkling, the water supply pump is activated to supply high-pressure water into the water sprinkling pipe 01, so that water is jetted from each jet port 02 and sprinkled around it.

(Problems to be Solved by the Invention) In the above-mentioned conventional water spray device, when the water sprinkling pipe 01 becomes long, the amount of water flowing therein increases, the flow velocity also increases, and the head of friction loss also increases accordingly. As a result, the water pressure in the sprinkling pipe 01 decreases as it goes to the tip, so that there is a problem that the amount of water and the flow velocity of the jet flow ejected from the jet port 02 decrease as it goes to the tip, causing so-called water sprinkling unevenness.

(Means for Solving the Problems) The present invention has been proposed to solve the above problems, and the gist of the present invention is to provide a large number of devices at predetermined intervals along the longitudinal direction over the entire length thereof. Fit the main pipe with the base end connected to the water pump in the sub-pipe formed by drilling the injection port,
The water sprinkling device is characterized in that the front end of the main pipe and the base end of the sub pipe are connected via a return pipe, and the main pipe and the sub pipe are communicated with each other by bypass over the entire length of the sub pipe. It is in.

(Operation) In the present invention, because of the above configuration, the water pumped from the water pump flows through the main pipe from its base end to its tip, passes through the return pipe and enters the auxiliary pipe, and its base end to its tip. In the process of flowing to, it spouts from a large number of jets one after another. During this time, the water pressure in the main pipe and the sub-pipe gradually decreases as it goes from the base end to the tip due to friction loss, but the pressure transmitted from the main pipe to the sub-pipe through the bypass goes from the base end to the tip of the sub-pipe. Since the pressure distribution gradually increases, the pressure distribution in the sub-tube becomes almost uniform over the entire length thereof, and therefore, the water amount and flow velocity of the jets ejected from the respective nozzles become equal, and water is sprayed from the nozzles in substantially the same area.

(Embodiment) One embodiment of the present invention is shown in FIG.

In FIG. 1 (A), 1 is a main pipe, 2 is a secondary pipe, 3 is a return pipe, 4 is a bypass, 5 is an injection port, and 6 is a resistance such as a valve.

The main pipe 1 is fitted in the sub pipe 2, its base end 1a is connected to a water pump (not shown), and its tip 1b is connected to the base end 2a of the sub pipe 2 via a return pipe 3. A large number of nozzles 5 are formed in the sub-tube 2 along the lengthwise direction from the base end 2a to the tip 2b at predetermined intervals l. The main pipe 1 is communicated with the sub pipe 2 through a plurality of bypasses 4 formed in the main pipe 1 at intervals L along the longitudinal direction over the entire length of the sub pipe 2. A resistor 6 such as a valve is provided in the return pipe 3.

Then, when the water pump is started, high-pressure water discharged from this water flows through the inside of the main pipe 1 from its base end 1a to the tip 1b, passes through the inside of the return pipe 3 and enters the auxiliary pipe 2 at its base end 2a. From the injection port 5 in the process of flowing into the auxiliary pipe 2 toward the tip 2b of the auxiliary pipe 2 and sprayed around it.

The pressure distribution in the main pipe 1 is shown in FIG. 1 (B), and the friction loss head F ₁ caused by water flowing in the main pipe 1 causes the main pipe 1
The internal pressure P ₁ gradually decreases as it goes from the proximal end 1a to the distal end 1b.

The pressure distribution in the sub-tube 2 is shown in FIG. 1 (C), and the friction loss head F ₂ due to the flow of water in the sub-tube 2 gradually increases from the base end 2a to the tip 2b. The pressure transmitted from the inside of the pipe 1 through the bypass 4 into the sub pipe 2 is
The pressure P ₂ in the auxiliary pipe 2 becomes substantially uniform over its entire length because it gradually increases as it goes from the base end 2a to the tip 2b.

Thus, if a large number of nozzles 5 are arranged with the same diameter, the amount of water ejected from each nozzle 5 and the flow velocity of the jet flow become equal,
The water is sprayed on the same area around each nozzle 5.

In addition, the mutual interval L and the flow passage area of the bypasses 4 need to be appropriately determined. That is, if the flow path area of the bypass 4 is excessively large, the pressure transmitted from the main pipe 1 to the auxiliary pipe 2 becomes larger than necessary, so that the pressure of the auxiliary pipe 2 near the tip 2b is closer to that of the proximal end 2a. It gets expensive. On the other hand, if the flow passage area is too small, the pressure transmitted from the main pipe 1 to the sub pipe 2 is small, so that the pressure near the tip 2b of the sub pipe 2 is lower than that near the base end 2a. If the distance L between the bypasses 4 is too large, the pressure distribution in the auxiliary pipe 2 becomes wavy.

When the diameter of the main pipe 1 and the diameter of the auxiliary pipe 2 are different from each other and the flow passage area of the bypass 4 is not appropriate, the water passing through the return pipe 3 by the resistance 6 such as a valve interposed in the return pipe 3 adjust the pressure P ₁ in the main pipe 1 by adjusting the resistance of adjusting the pressure difference between the pressure P ₂ in the sub-pipe 2.

(Effect of the Invention) In the present invention, the main pipe whose proximal end is connected to the water feed pump is fitted into the sub-pipe in which a large number of nozzles are bored at predetermined intervals along the longitudinal direction over the entire length thereof. Since the front end of the main pipe and the base end of the sub pipe are connected via a return pipe and the main pipe and the sub pipe are communicated with each other by bypass over the entire length of the sub pipe, The pressure can be made substantially constant over the entire length thereof, and therefore, the water amounts and flow velocities of the jets ejected from the plurality of nozzles can be made equal to each other, so that water can be uniformly sprinkled over the entire length of the auxiliary pipe. Moreover, since the structure is simple, there are few failures, and it can be manufactured at low cost. Further, since the main pipe is fitted in the sub pipe, it is convenient to carry and store.

[Brief description of drawings]

FIG. 1 shows one embodiment of the present invention. FIG. 1 (A) is a schematic vertical sectional view, FIG. 1 (B) is a pressure distribution diagram in the main pipe, and FIG.
FIG. 1C is a pressure distribution diagram in the auxiliary pipe, and FIG. 1D is a cross-sectional view taken along the line D-D of FIG. 1A. FIG. 2 is a schematic sectional view showing an example of a conventional watering device. Main pipe …… 1, sub pipe …… 2, return pipe …… 3, bypass ……
4, nozzle …… 5

Claims (1)

[Scope of utility model registration request] 1. A main pipe, the base end of which is connected to a water pump, is fitted into a sub-pipe having a large number of injection holes formed at predetermined intervals along the longitudinal direction over the entire length of the main pipe. A sprinkling device, characterized in that a tip end of a pipe and a base end of the sub pipe are connected via a return pipe, and the main pipe and the sub pipe are communicated with each other by bypass over the entire length of the sub pipe.