JP2014147933A - Liquid distribution header - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid distribution header capable of equivalently supplying liquid supplied from a single liquid supply source, to a plurality of supply destinations.SOLUTION: A liquid distribution header comprises: a branch pipe connected to a single liquid supply source; and a header pipe connected to an end of the branch pipe. The header pipe has an inner diameter made larger than that of the branch pipe to such a degree that the header pipe can have a lower flow rate and a lower pressure loss than the branch pipe. Equal number of holes are provided at equal intervals in both sides of the connection position of the header pipe with the end of brach pipe.

Description

  The present invention relates to a liquid distribution header.

  In order to inject water over the widest possible area from the tip of a water supply pipe connected to a water supply source such as a water supply pump, as shown in FIG. 5, a nozzle header used by connecting to the tip of the water supply pipe 1 There are two. The conventional nozzle header 2 is formed by attaching a plurality of nozzles 22 to a single mother pipe 21 at intervals in the longitudinal direction.

  In order to inject an equal amount of water from any nozzle 22 of the nozzle header 2, conventionally, a nozzle having a different diameter or a nozzle whose diameter can be adjusted is used, and the water supply pipe 1 of the mother pipe 21 is used. By increasing the nozzle diameter far from the nozzle diameter close to the connection position, the discharge amount of each nozzle is made equal. Conventionally, the inner diameters of the water supply pipe 1 and the mother pipe 21 are the same.

nothing special

  Therefore, conventionally, the nozzle 22 having a different diameter or the nozzle 22 capable of adjusting the diameter is required, so there is a problem that the nozzle header becomes expensive, and the setting of the diameter according to the mounting position of each nozzle. Or there was a problem that adjustment was complicated.

As a method of collecting and removing the sediment deposited in the sedimentation basin of the sewage treatment facility in one place, a sand collection pit is formed at the center of the bottom of the sedimentation basin, and the bottom of the sand collection pond is deepest around the sand collection pit The main trough is formed at the bottom between the side walls on both sides of the sand basin so that it intersects the sand collection pit parallel to the direction of water flow in the sand basin and the sand collection pit side is deep, A surface that slopes down from the side walls on both sides to the bottom surface of the sand collection pit (hereinafter referred to as a sand collection pit slope surface) is formed. A small trough is formed, and each upper trough of the main trough and the sand collection pit slope, nozzles in the sand collection pit, and the areas where the bottom surface of the sand collection basin is divided into multiple water flow directions in the sand collection pit. Install and settling sand Flowing water sediment deposited on the bottom of the settling basin by injecting a low pressure water of less than 3 kg / cm ² from the nozzle in a state of being discharged at drain pump (drainage state) of the inner to the main runner, the flow sediments A low-pressure sand removal method that collects the collected sand in the sand collection pit, pumps it together with water by a sand pump installed in the sand collection pit and agitate it with a nozzle in the sand collection pit, and transfers it to the sewage settling basin. Is described in Patent Document 1.

  In the sand basin that implements the low-pressure sand collection method, the bottom surface of the sand basin is divided into a plurality of areas to form the sand basins in each area in order to allow the sediment deposited on the bottom surface of the sand basin to flow. A nozzle header is attached near the side wall and above the sand basin. In that case, it is desirable that the discharge amount from each nozzle is equal so that the sediment on the bottom of the sand basin can be efficiently and uniformly flowed. In addition, since it is necessary for the nozzle header to flow earth and sand from the entire bottom surface of the sand basin, it is desirable that the nozzle header be installed as close as possible to the side wall of the sand basin. It is done.

  As shown in FIG. 5, the nozzle header 2 in which an equal number of nozzles 22 having the same diameter are attached to both sides of the connection position of the mother pipe 21 to the water supply pipe 1 is arranged so that the mother pipe and the inner diameter are in the center in the longitudinal direction of the mother pipe 21. When the same water supply pipe 1 is connected and the water supply pipe 1 is connected to a water supply source (not shown), the water from the water supply source is subjected to pressure by friction while flowing through the water supply pipe 1 and the mother pipe 21. To lose. As the mother pipe 21 is made thinner in accordance with the request for installation in a sand basin, the difference in pressure loss to each nozzle increases. Since the loss rate becomes larger as the nozzle is farther from the connection position between the water supply pipe 1 and the mother pipe 21, the discharge amount from each nozzle is larger than the connection position between the water supply pipe 1 and the mother pipe 21 as shown in FIG. The farther away the nozzle is, the smaller it is. Therefore, when such a nozzle header is used, there exists a problem that the earth and sand deposited on the bottom face of a sand basin cannot be poured uniformly and efficiently.

  The present invention has been made in view of the above circumstances, and provides a liquid distribution header that can distribute and supply liquid supplied from one liquid supply source to a plurality of supply destinations in equal amounts. With the goal.

In order to achieve the above object, a liquid distribution header according to the present invention includes a branch pipe connected to one liquid supply source and a mother pipe connected to an end of the branch pipe, and the mother pipe has an inner diameter thereof. Is larger than the inner diameter of the branch pipe to such an extent that the flow velocity and pressure loss of the liquid can be reduced, and an equal number of holes are provided at equal intervals on both sides of the connection position with the end of the branch pipe of the mother pipe. It is characterized by being provided.
According to a second aspect of the present invention, in the liquid distribution header of the first aspect of the invention, the mother pipes connected to the ends of the branch pipes are separated and independent from each other, and the mother pipes are arranged at the center position in the longitudinal direction. A branch pipe is connected, and an equal number of holes are provided on both sides of the connection position of each mother pipe with the branch pipe.

  According to the present invention, since the inner diameter of the mother pipe is larger than the inner diameter of the branch pipe, the flow velocity of the liquid flowing from the branch pipe to the mother pipe is reduced, the pressure loss is reduced, and the end of the branch pipe Since equal numbers of holes are mounted at equal intervals on both sides of the connection position with the mother pipe, there is no significant difference in pressure loss to each hole, so the liquid discharge rate from each hole is almost equal. .

  The mother pipes connected to both ends of the branch pipes are separated and independent from each other, and the branch pipes are connected to the center positions in the longitudinal direction of the mother pipes. When the same number of holes are provided, each mother pipe can be aligned on a common straight line, and the angle around the axis of each end of the branch pipe can be arbitrarily changed. Depending on the, the orientation of the two mother tubes can be changed.

It is a front view of the 1st example at the time of applying the liquid distribution header of the present invention to a nozzle header. FIG. 2 is a development view of nozzles attached to the nozzle header of FIG. 1, (a) is a front view, (b) is a left side view, (c) is a central longitudinal sectional view of (a), and (d) is a bottom view. FIG. It is a conceptual diagram which shows the water discharge state from each nozzle of the nozzle header of FIG. It is a front view of the 2nd example at the time of applying the liquid distribution header of the present invention to a nozzle header. It is a front view of the conventional nozzle header. It is a conceptual diagram which shows the water discharge state from each nozzle of the nozzle header of FIG.

Next, embodiments of the present invention will be described with reference to the drawings.
Below, the case where the liquid distribution header based on this invention is applied to a nozzle header is demonstrated.
In FIG. 1, reference numeral 2 </ b> A denotes a nozzle header according to an embodiment of the present invention, which includes a mother pipe 21 and a branch pipe 23. The branch pipe 23 has a connection part 23 a for connecting to a liquid supply source, for example, the water supply pipe 1, in the middle part in the longitudinal direction. A flange 23f is provided at the distal end of the connecting portion 23a so as to overlap with the flange 1f provided at the end of the water supply pipe 1 and fixed by a fixing tool such as a bolt and nut. The end of the branch pipe 23 is connected to the mother pipe 21 at a position away from the mother pipe 21, preferably at an appropriate predetermined position according to the number of nozzles connected to the mother pipe from the end of the mother pipe 21. The nozzle header illustrated in FIG. 1 is an example in which eight nozzles are attached. In this case, the end of the branch pipe 23 is a quarter of the length of the mother pipe from the end of the mother pipe 21. Connected to the position.

  As illustrated in FIG. 2, the nozzle 22 attached to the mother pipe 21 compresses the tip of the circular pipe and includes an oval injection port having a predetermined cross-sectional area. It is attached on both sides of the connection positions 21a and 21b with the end of the branch pipe 23 so as to be equal (two in the example of FIG. 1) and so that the intervals between the nozzles are equal. . Since it is technical common sense, needless to say, a hole (not shown) for attaching the nozzle is provided at a position where the nozzle 22 of the mother pipe 21 is attached. Then, it is attached by screwing the male screw portion of the nozzle as shown in FIG. 2 into the hole, and the hollow portion of the mother pipe 21 and the injection port of the nozzle 22 attached to the hole communicate with each other through the hole. . All the nozzles 22 have the same diameter and do not have an adjustment function. Both ends of the mother pipe 21 are sealed with a closing plate 24 fixed to the flange 21f.

  The inner diameter of the branch pipe 23 is equal to the inner diameter of the water supply pipe 1, but the inner diameter of the mother pipe 21 is slightly larger than the inner diameter of the branch pipe 23. The size of the inner diameter of the mother pipe 21 takes into account the cross-sectional area of the injection port of the nozzle 22, the flow rate of water flowing into the mother pipe 21 from the branch pipe 23 is reduced, the pressure loss is reduced, and the discharge of the nozzle The pressure and the discharge amount are set so as not to cause a large difference between the nozzles.

For example, the main pipe 21 is provided with eight nozzles having an inner diameter of about 100 mm and a cross-sectional area of about 820 mm ² attached at intervals of 500 mm, to which water having a water pressure of 3 kg / cm ² is supplied from the water supply pipe 1. In this case, the inner diameter may be set to about 125 mm.
That is, the inner diameter of the mother pipe 21 is appropriately set according to the flow velocity in the branch pipe 23, the nozzle diameter (cross-sectional area), the number of nozzles attached, and the like. The discharge amount of each nozzle is slightly smaller as the distance from the connection positions 21a and 21b between the main pipe 21 and the both ends of the branch pipe 23 increases depending on the distance between the nozzles.

  As described above, both ends of the branch pipe 23 connected to the water supply pipe 1 in the middle in the longitudinal direction are connected to the mother pipe 21 at positions away from each other, and the inner diameter of the mother pipe is made faster than the inner diameter of the branch pipe. When nozzles 22 having an equal number of predetermined cross-sectional areas are mounted at equal intervals on both sides of the connection position between the both ends of the branch pipe of the mother pipe, the pressure at each nozzle 22 is substantially reduced. Therefore, as shown in FIG. 3, the difference in the discharge amount from each nozzle 22 is reduced.

  Therefore, when such a nozzle header is installed near the side walls on both sides of the sand basin, and water is sprayed from the nozzle toward the bottom of the sand basin, it can be sprayed evenly on the bottom surface. Sediment deposited on the bottom of the pond can be flushed evenly.

  FIG. 4 shows a nozzle header 2B according to another embodiment of the present invention. The nozzle header 2B is formed by connecting independent pipes 21L and 21R to each end of the branch pipe 23. On both sides of the connecting portions 21a and 21b of the mother pipes 21L and 21R with the branch pipe 23, an equal number, two nozzles 22 in the illustrated example, are attached at equal intervals.

  When separate and independent mother pipes are used as in this embodiment, the mother pipes can be aligned on a common straight line, or the angle around the axis of each tip of the branch pipe 23 can be arbitrarily changed. it can. That is, the directions of the two mother pipes 21L and 21R can be changed according to the state of the water jet target surface. It is suitable for use when water is sprayed on one surface having a uniform inclination direction, two surfaces having different inclination directions, or the like.

  In the above embodiment, nozzles 22 having the same diameter and not having a diameter adjusting function are used, but a nozzle having a diameter adjusting function can also be used. In this case, there is an advantage that the unbalance of the injection amount due to the nozzle mounting error or the like can be finely adjusted.

  The shape of the injection port of the nozzle 22 is not limited to that shown in FIG. Also, the liquid distribution headers 2A and 2B are supplied with equal number of holes on both sides of the connection position with the end of the branch pipe of the mother pipe, and used by the purchaser of the liquid distribution headers 2A and 2B. A nozzle can be attached to the hole depending on the purpose.

1 Water supply pipe (liquid supply source)
2A, 2B nozzle header (liquid distribution header)
21, 21L, 21R Mother pipe 22 Nozzle 23 Branch pipe

Claims (2)

  A branch pipe connected to one liquid supply source and a mother pipe connected to the end of the branch pipe, the inner diameter of the mother pipe being higher than the inner diameter of the branch pipe. The liquid distribution header, which is enlarged to such a degree that it can be reduced, and is provided with equal numbers of holes at equal intervals on both sides of the connection position of the main pipe to the end of the branch pipe. . The liquid distribution header according to claim 1, wherein the mother pipes connected to the ends of the branch pipes are separated and independent from each other, the branch pipes are connected to the longitudinal center position of the mother pipes, and An equal number of holes are provided on both sides of the connection position of each mother pipe with the branch pipe, respectively.

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