JP6519908B2 - elbow - Google Patents

Description

  The present invention relates to an elbow in a gutter.

    Generally, gutters in houses are composed of an eaves receiving rainwater flowing down from the roof and a gutter connected to the eaves via a water collector or a gutter, but in recent years, it has been narrowed in terms of design Eaves and chopsticks are often used.

  However, if it is a thin rain gutter, it may overflow without being able to drain when heavy rain.

  To this end, it has been proposed to use a siphon principle to increase the amount of drainage per unit time, so that even narrow gutters can be suitably drained from rainwater during heavy rains (Patent Document 1). .

  In this case, an elastic extension plate is provided on the inner peripheral surface of the rod joint for connecting the rod up and down, and an opening with an inner diameter smaller than the inner diameter of the rod is provided at the center of this overhang member. A part is provided.

  The above-mentioned extension plate which constitutes an orifice for reducing the flow passage area, when rainwater having a predetermined flow rate or more flows into the weir, causes resistance and causes the rainwater to stay above it. When the pressure (the weight of the rainwater) acting from the stagnant rainwater exceeds the resistance by the orifice, the stagnant rainwater rapidly flows down the orifice to generate a negative pressure below the orifice. As a result, the flow rate of the rainwater flowing down the orifice increases, and the stagnant rain water is pulled to flow down, so the flow rate per unit time increases.

  However, in the above-mentioned thing which provided the extension board which brings about the siphon effect in the coupling | joint arrange | positioned in the middle of a weir, the situation where rain water may overflow in the part of a gutter and a water collector may occur.

JP 2012-144870 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an elbow in which an increase in the amount of drainage due to the siphon effect can be obtained and in which flooding from the eaves or water collector is less likely to occur.

The elbow according to the present invention has a tubular shape which is open at both ends and is bent in an arc shape, and has an overhanging portion projecting inward on the inner circumferential surface to narrow the flow passage area, and The portion is formed such that the flow passage area gradually decreases toward the downstream side, and the downstream portion of the overhanging portion is formed such that the flow passage area gradually increases toward the downstream side, and the upstream portion the center of the flow path is abrupt change in area, Ri changes slowly der flow passage area of the portion of the downstream side, the overhang, the thickness of the cylindrical wall is bent in an arc, arc It is characterized in that it is provided by making one of the near side and the far side thicker than the other .

The said overhang | projection part may be arrange | positioned in the place close | similar to the downstream opening which a crucible is covered on the outer peripheral side and connected .

Further, the first tubular member and bending song cylindrical, a bent tubular, the second tubular member is connected to the downstream side of the first cylindrical member, in the configuration, the first tubular member, The protruding portion may be provided on an inner peripheral surface of a downstream side portion of the second cylindrical member slidably fitted in the upstream side portion of the second cylindrical member .

  According to the present invention, in order to increase the amount of drainage by the siphon effect closer to the water collector than to the weir, it is less likely to cause flooding from the eaves and water collector, and more effective for smooth drainage of rainwater. Can be configured.

(a) is a longitudinal cross-sectional view of one Example of this invention, (b) is XX sectional drawing. FIG. It is sectional drawing of another example. (a) (b) (c) is a sectional view showing another example, respectively. It is sectional drawing of another Example. It is sectional drawing of another Example.

  Hereinafter, the present invention will be described in detail based on the illustrated embodiment. The elbow 1 shown in FIGS. 1 and 2 is a slide in which a first cylindrical member 11 and a second cylindrical member 12 which both open at both ends are slidably combined. It is an elbow.

  The first cylindrical member 11 and the second cylindrical member 12 both have a curved cylindrical shape, and a part of the first cylindrical member 11 is slidably fitted in one end opening of the second cylindrical member 12, and the sliding amount By adjusting, the angle of the elbow 1 (the direction of the both-end opening) can be adjusted. Further, the upstream end of the first cylindrical member 11 in which the downstream end is fitted into the second cylindrical member 12, the outer peripheral surface side thereof is for connection with a water collector (not shown) or a gutter The connection portion 15 of the The other end side of the second cylindrical member 12 is a connection portion 16 which is connected with a call lever or a hook covered on the outer peripheral side.

  And, on the inner peripheral surface of the upstream end portion of the first cylindrical member 11, a protruding portion 2 protruding to the inner peripheral side is provided. The projecting portion 2 is in the shape of a throat in which a change in the flow passage area is gradual. Further, the overhanging portion 2 is provided such that the thickness of the first cylindrical member 11 closer to the arc center point is thicker than the thickness farther from the center point.

  As shown in FIG. 3, a throat-like overhanging portion 2 may be provided at a portion of the first cylindrical member 11 slidably fitted on the inner peripheral side of the second cylindrical member 12. Further, here, the thickness on the side far from the arc-shaped center point of the first cylindrical member is made thicker than the thickness on the side closer to the center point.

  Although the slide elbow is shown as the elbow 1 in each of the above-mentioned embodiments, it is needless to say that the elbow 1 may be an angularly fixed elbow consisting of a single cylindrical member, and as shown in FIG. The projecting portion 2 provided on the inner circumferential surface of the elbow 1 may be provided on any of the inner circumferential surface of the upstream end, the inner circumferential surface of the central portion, and the inner circumferential surface of the downstream end.

  From the point of view that it is preferable to have the overhang part 2 that exerts the siphon effect near the water collector in terms of preventing flooding from the eaves and the water collector, the upstream end of the elbow 1 It is preferable to provide the overhang part 2.

  In this case, in the slide elbow including the first cylindrical member 11 and the second cylindrical member 12, as shown in the above embodiment, the first to be fitted on the upstream side and the inner peripheral side of the second cylindrical member 11. The projecting portion 2 is provided on the cylindrical member 11.

  From the viewpoint that the flow of rain water is smoother if there is a linear flow channel on the downstream side of the overhanging portion 2, it is preferable to provide the overhanging portion 2 near the opening on the lower end side of the elbow 1 as described above.

  An example is shown in FIG. The elbow here is formed of a cylindrical first cylindrical member and a second cylindrical member bent together, and the first cylindrical member 11 is slidably fitted on the inner peripheral side of the second cylindrical member 12, thereby opening both ends. The orientation of the slide elbow is variable within the range of approximately 90.degree.

  And the overhang | projection part 2 of the cross-sectional mountain shape is provided in the inner peripheral surface of the connection part 16 of the 2nd cylinder member 12 which is near a lower end opening part and is outside the slide area | region of a 1st cylinder member. When a weir is connected to the connection portion 16, the overhanging portion 2 is positioned at a portion where the water flow flowing in the elbow 1 falls substantially vertically.

  FIG. 6 shows one in which the throat-like overhanging portion 2 is provided on the inner peripheral surface of the connecting portion of the second cylindrical member 12. The overhanging portion 2 shown here has a shape in which the change in the flow passage area from the upstream side to the downstream side becomes relatively steep and narrow, and then gradually widens. Also in this case, when a weir is connected to the connection portion 16, the overhang portion 2 is positioned at a portion where the water flow flowing in the elbow 1 falls substantially vertically.

  The cross-sectional shape of the overhang portion 2 provided on the elbow 1 may be either a throat shape or a cross-sectional mountain shape as described above, or it may be a compromise type of both shapes. The cross-sectional shape shown in FIG. 6 was able to obtain a stable siphon drainage capacity.

  By the way, the throat-shaped or sectioned overhanging portion 2 provided on the elbow 1 functions as follows. That is, when the rainwater flows in the elbow 1, the rainwater flows down along the inner circumferential surface of the elbow 1 and in the overhang portion 2 flows along the bulge of the overhang portion 2. When the amount of rainwater increases, the flow passage area narrows when passing through the overhanging portion 2, so that the overhanging portion 2 functions as a venturi and accelerates the flow velocity of rainwater.

  Then, the amount of rainwater flowing down further increases, and the rainwater remains upstream of the overhanging portion 2 due to the resistance due to the reduction of the flow passage area. Then, if the amount of stagnation increases and the gravity of the stagnant rainwater overwhelms the resistance, the stagnant rainwater flows down the overhang portion 2 at a stroke, and the rainwater flowing into the elbow 1 can be drawn in to obtain a siphon effect. Accordingly, the flow rate per unit time of the rainwater is greater than when the overhanging portion 2 is not present.

  As described above, the elbow 1 according to the present invention is used by being connected to a water collector to which an eaves is connected, or is disposed at a connection portion between a calling rod and a pot. However, it is preferable to connect to the water collector as described above in terms of preventing flooding from the eaves and the water collector.

1 elbow 2 overhanging portion 11 first cylinder member 12 second cylinder member

Claims (3)

Both ends are open and it is cylindrical shape bent in the shape of an arc, and it equips the inner skin with an overhang part which is projected inward and which narrows a flow path area,
The upstream side portion of the overhanging portion is formed such that the flow passage area gradually decreases toward the downstream side, and the downstream side portion of the overhanging portion is formed such that the flow passage area gradually increases toward the downstream side And
The change in flow passage area of the upstream portion is steep, Ri changes slowly der flow passage area of the portion of the downstream side,
The projecting portion is characterized in that the thickness of the cylindrical wall bent in an arc shape is provided by making one of the side closer to the arc center point and the far side thicker than the other. Elbow to do.   The elbow according to claim 1, wherein the overhanging portion is disposed near the downstream opening where the weir is covered and connected to the outer peripheral side. It is comprised by the bent cylindrical 1st cylinder member and the 2nd cylinder member which is cylindrical and bent and is connected to the lower stream side of the above-mentioned 1st cylinder member,
The first cylindrical member is slidably fitted in the upstream portion of the second cylindrical member;
The elbow according to claim 1 or 2, wherein the projecting portion is provided on an inner peripheral surface of a downstream side portion of the second cylindrical member.

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