JPS5923068Y2 - jet flow gate - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a jet flow gate.

This gate has an orifice section with a 45° edge between the upstream tube body and the downstream tube body, and water is ejected from the orifice section as a jet. It is a gate with excellent wood characteristics, as it releases water without being affected by the guiding groove, and there are no problems such as cavitation due to high-speed flow. It is difficult to manufacture a tube with a nominal diameter of 200 mm or less.

However, when using a device with a nominal diameter of 200 mm or more for game I, which requires the adjustment of small volumes of agricultural water, etc., it must be used with most of the orifice section closed by the door body. Furthermore, since the stroke of the door body becomes smaller when adjusting the flow rate, there is a problem that the control ability is significantly deteriorated.

In order to solve the above problems, this invention provides a small-diameter jet flow gate in which the outer diameter of the orifice part is set to a size that does not pose any difficulty in manufacturing, and the nominal diameter of the orifice part is set to the required small diameter. be.

The details of this invention will be explained below based on the attached drawings.

In the figure, 1 is a cylindrical upstream tube, 2 is a cylindrical downstream tube, and an orifice A is provided between the tubes 1 and 2.

In addition, in the illustrated example, both tube bodies 1.2 are integrated, but
Sometimes it is a separate entity.

The orifice portion A consists of a seal ring 3, a seal ring retainer 4, and a ring gasket 5.

That is, the inner periphery of the seal ring retainer 4 engages with the recess on the downstream side of the outer periphery of the seal ring 3, and the retainer bolts 6 inserted into the plurality of inlets formed near the outer periphery of the retainer 4 are inserted into the upstream pipe. A recess on the upstream side of the outer periphery of the seal ring 3 and a recess on the inner periphery of the downstream end of the upstream pipe body 1 A ring gasket 5 made of an elastic material such as rubber and having a circular cross section is fitted in between in a compressed state to maintain watertightness between the outer periphery of the seal ring 3 and the tube body 1.

Further, the seal ring 3 is composed of a straight portion a and a tapered portion S, and the straight portion a is lengthened to reduce the inner diameter of the tapered portion, that is, the nominal diameter of the orifice.

Reference numeral 7 denotes a door body, and both sides of the door body 7 are slidably fitted into door grooves 8 on both sides of the downstream pipe body 2 so that it can be pulled up into a bonnet 9 formed at the top of the pipe body 2. It has become.

Further, a hoist 10 for raising and lowering the door body 7 is provided on the bonnet 9.

11 is an air supply pipe provided on the downstream pipe body 2;
This is to prevent negative pressure from building up inside.

This invention has the above configuration, and in FIG. 1, the door body 7 is in the fully closed position.

When the door body 7 is completely raised and fully opened, the water becomes a jet stream C as shown by the chain line in FIG. 1, completely jumps over the door groove 8, and flows downstream.

The jet flow C has a diameter considerably smaller than the inner diameter of the downstream tube body 2.

Therefore, the downstream pipe body 2 can be narrowed to a diameter that does not impede the jet flow C when fully opened.

Further, if the upstream tube body 1 is also a gradually expanding tube that opens in a tapered shape toward the orifice portion A as shown in the illustrated example, the tube diameter can be made small.

In this invention, as mentioned above, the diameter of the outer peripheral part of the orifice part A is set to a size that does not cause difficulty in machining.
The outer circumference of the seal ring 3 and the seal ring retainer 4 can be easily processed and assembled, and this part can be made completely watertight.

Moreover, since the seal ring 3 consists of a straight part a on the outer periphery and a tapered part on the inner periphery, even though the outer diameter is sufficiently large, the inner diameter, that is, the nominal diameter, can be narrowed down to the desired diameter, resulting in a small capacity. Even when adjusting the flow rate, the stroke of the door body 7 can be made large, and the control ability can be improved.

Furthermore, by attaching seal rings 3 having different inner diameters while keeping the seal rings 3 the same except for the inner diameter, jet flow gates having different nominal diameters can be easily obtained.

[Brief explanation of drawings]

FIG. 1 is a vertical side view showing an embodiment of the jet flow gate of this invention, and FIG. 2 is an enlarged vertical side view of the main parts of the same. 1...Upstream tube body, 2...Downstream tube body, 3...Seal ring, 7...Door body,
11... Air supply pipe, a... Straight part, b... Tapered part, A... Orifice part.

Claims (1)

[Scope of utility model registration request] In a jet flow gate, an orifice section is provided between an upstream tube body and a downstream tube body, a slidable door body for opening and closing this orifice section is provided on the downstream side, and an air supply pipe is provided in the downstream tube body. A jet flow gate characterized in that an orifice part is constituted by a seal ring having a straight part and a tapered part on the inner periphery, and the inner diameter of the seal ring is made considerably smaller than the inner diameter of the upstream and downstream pipe bodies.