JPS5946005B2 - flow control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel flow control device, and more particularly to a flow control device that provides a substantially constant discharge rate by controlling the flow rate.

Such devices are particularly important where irrigation must be done at a uniform rate and density.

For example, a rotary water sprinkler (hereinafter referred to as a rotary water sprinkler) having at least one nozzle disposed radially with respect to a central supply conduit and configured such that the nozzle communicates with and can rotate about the conduit. certain rotary water sprinklers)
The installation and use of such a flow control device in the system allows the area sprayed by the sprinklers and the amount sprayed to be substantially uniform for each sprinkler and substantially insensitive to changes in supply pressure. You can make it disappear. It is an object of the present invention to provide a new and improved flow control device.

According to the present invention, a housing, a housing inlet connected to a liquid supply source, a housing outlet, a housing wall formed in the housing, and both ends of the inlet and the outlet, respectively. a tubular flow passage communicating with the housing, and a chamber communicating with the inlet and otherwise closed and separated from the flow passage by at least one resilient wall portion; The section is provided with a crescent-shaped barrier having a substantially uniform curve with a minimum height adjacent the inlet and outlet, the barrier forming a narrow section in the flow path. There is provided a flow rate control device configured such that a portion of the supplied liquid enters the chamber in a substantially non-flowing state, and the remaining portion exits through the flow path.

In such devices, the pressure of the liquid in the chamber is
It becomes equal to the pressure of the liquid flowing into the housing inlet.
On the other hand, due to Bernoulli's law, a liquid passing through a flow path having a significant flow rate will have a pressure significantly lower than that of a liquid in an adjacent chamber at a substantially stationary state. The chamber is separated from the flow passageway by at least one resilient, flexible wall portion such that when the pressure within the chamber increases, this wall portion deflects towards the flow passageway, causing the wall portion to deflect toward the flow passageway. This reduces the flow area of the flow path. Equilibrium occurs when the flow rate passing through the flow path is constant. This is a balance between the forces acting on both sides of the resilient and flexible wall section, i.e. the force due to the hydraulic pressure in the chamber, and the force caused by the hydraulic pressure in the flow path and the return force of the wall section. You can get it when you do. Next, the flow rate control device of the present invention will be explained with reference to the drawings. FIG. 1 is a perspective view showing each component of an embodiment of the flow rate control device of the present invention, FIG. 2 is a vertical sectional view of one of the components shown in FIG. 1, and FIG. FIG. 4 is a partial cross-section showing the device shown in FIGS. 1 and 2 attached to a specific rotary water sprinkler. It is an explanatory diagram.

In this embodiment, the housing is an elongated channel member 3.
1, a rubber piece 41, and a holding member 43.

The channel member 31 has end walls 32 and 33. An inlet 34 is formed in the end wall 32 and an outlet 34' is formed in the end wall 33. The end wall 33 is formed integrally with an annular barrier 35. A tubular hub 36 having a sloped outer surface is integrally formed with the barrier 35. A protruding portion 37 for abutting purposes is formed to protrude from the barrier 35 in a direction opposite to the hub 36 and to be spaced apart from the channel member 31 by a certain distance.
Reference numeral 38 denotes a protrusion for contact, which protrudes outward from the end wall 32 and is formed to be flush with the upper edge thereof.

A crescent-shaped barrier 39 extends upward from the base of the channel member 31.

The barrier 39 rises in a uniform curve from a position adjacent the inlet 34 and outlet 34' and reaches its maximum height at the central portion 40. A rectangular resilient rubber piece 41 (see FIG. 1) is configured to be placed on the channel member 31 and has an upwardly extending longitudinally extending protruding edge 42.

A flow path is formed between the channel member 31 and the rubber piece 41. The rectangular holding member 43 is formed from a pair of side walls 44, a top wall 45 having a rectangular opening 46, and an end wall 47 having an opening 48.

In this device, a rubber piece 41 is placed on a channel member 31,
It is assembled by holding this in a predetermined position with the holding member 43.

The holding member 43 is attached around the channel member 31 with one end held under the protrusion 37 and the protrusion 38 inserted into the opening 48 . Rubber piece 41
The projecting edge 42 of engages with the longitudinal edge of the holding member 43. When used in a particular rotary water sprinkler system, the device of this embodiment is placed at the mouth of the supply pipe 51, as shown in FIG. 53 Cuppling Skirt 52
is pressed against the edge of the mouth by an inner flange of the mouth.

The supply pipe 51 is screwed into the skirt 52. As is clear from FIG. 4, a chamber 54 is formed between the present device and the supply pipe 51, and a rinsing liquid is stored in the chamber 54 without substantially flowing. Supply pipe 51
receives internal hydraulic pressure.

On the other hand, the rinsing liquid enters the sprinkler from the inlet 34 through the barrier 39 and the outlet 34/. In the embodiment described above, when the flow of liquid through the device reaches a significant velocity, the hydraulic pressure within the device will be lower than the hydraulic pressure within the chamber 54. Since the barrier 39 whose shape gradually changes is provided, the velocity of the passing liquid gradually increases, and its pressure gradually decreases, reaching a maximum value and a minimum value, respectively, when the liquid reaches the central part 40. value. Chamber 54 is separated from central portion 40 by a rubber piece 41.

As the pressure difference on both sides of the rubber piece 41 increases (caused by the increasing supply pressure), the rubber piece 41 moves towards the central part 4.
Limit the flow area of the flexure device inward toward 0. Of course, the above-described flow rate control device can also be used as a flow rate control device for other rotary, water, and sprinkler systems.

Next, embodiments of the flow rate control device of the present invention will be listed.

(1) The flow rate control device according to claim 1, wherein the flexible wall portion is constituted by a flexible membrane attached to an open wall portion.

(2) the wall of the housing comprises a rigid partition extending across the housing between the inlet and the outlet, a tubular flow passageway extending through the partition; One end of the flow path adjacent to the inlet is open.

The flow rate control device according to claim 1, wherein the flow rate control device is covered with a flexible membrane. (3) a tube member having an elongated opening in the housing, an inlet and an outlet; a flexible membrane for sealing the opening; and a holding means for holding the membrane in the sealed position; , and a rigid wall portion integrally formed with the tube member and formed laterally.

(4) at least one nozzle disposed radially relative to the central supply conduit, the nozzle communicating with and rotatably disposed about the conduit; A rotary water sprinkler equipped with the flow rate control device according to items (1) to (3).

(5) The rotary water sprinkler according to item (4), wherein the chamber is formed between the tubular flow path and a coupling unit of the sprinkler.

(6) The rotary water sprinkler according to item (5), wherein the rigid partition in item (2) is configured to be held within the coupling unit.

(7) A conduit connected to the rotary sprinkler head is formed integrally with the rigid part.
Rotary, water, and sprinkler as described in ).

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing each component of still another embodiment of the flow rate control device of the present invention, FIG. 2 is a vertical sectional view of one component shown in FIG. 1, and FIG. FIG. 4 is a perspective view showing the parts assembled, and FIG. 4 is a partially sectional explanatory view showing the device shown in FIGS. 1 and 2 attached to a rotary water sprinkler. . (Required numbers in the drawing), 31: Channel member, 34: Inlet, 34': Outlet, 39: Crescent-shaped barrier, 40:
Central part of barrier, 41: Rubber piece, 43: Holding member, 54:
Chiyamba.

Claims (1)

[Claims] 1. A housing, a housing inlet connected to a liquid supply source, a housing outlet, a housing wall formed in the housing, and a tubular tube that communicates with the inlet and the outlet at both ends, respectively. a flow passageway and a chamber communicating with said inlet and otherwise closed and separated from the flow passageway by at least one resilient, flexible wall portion, said chamber having a flow path in said housing wall; A crescent-shaped barrier having a substantially uniform curve of minimum height adjacent the inlet and outlet is provided, the barrier forming a narrow portion of the flow path, and A flow rate control device configured such that a portion of the liquid is introduced into the chamber in a substantially non-flowing state, and the remaining portion exits through the flow path.