JPS5814922B2 - High energy loss generator for liquids - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to prevent erosion of equipment by causing high energy loss in the liquid when a large amount of liquid is supplied to a part of the outer peripheral side of the cross section of the liquid flow path. This invention relates to a high energy loss generating device K for liquids that prevents the generation of gas and noise.

Generally, a liquid flow path such as a factory piping is provided with a valve that shuts off the flow of liquid flowing within the flow path.

When trying to make liquid flow in such a liquid flow path by changing the valve from the shut-off state to the open state, the liquid is rapidly accelerated and flows through the gap in the valve opening at the beginning of the opening of the valve, causing its contraction. Due to the pressure drop in the flow section, some of the liquid changes to the vapor phase, and as the liquid leaves the valve section, the pressure recovery causes the vapor bubble to collapse, inducing a destructive shock wave, causing noise and liquid A phenomenon occurs that causes erosion of the flow path.

Such a phenomenon occurs not only in the valve portion of the liquid flow path, but also when a large amount of liquid is supplied at once to a part of the outer peripheral side of the liquid flow path from a branch pipe or the like.

To explain this phenomenon with reference to FIG. 1, for example, immediately after the valve, when the valve is slightly opened, the area A immediately behind the valve body, that is, the back surface of the valve body at a position away from the opened gap between the valve body and the valve body. In the part C, the pressure is low and a fairly turbulent so-called drift flow occurs, which promotes the generation of bubbles.In the part C near the channel wall, that is, the part where liquid streamlines are constantly present and formed, the pressure increases due to contracted flow. During the process of sudden pressure drop and recovery, the vapor bubbles generated are destroyed and a destructive shock wave is induced.

Further, in the portion B between the portions A and C, a vortex is generated and the flow of the liquid becomes considerably turbulent.

Therefore, in order to prevent the above-mentioned complicated and broadly speaking three-part flow from occurring, it is necessary to reduce the contraction of the liquid immediately after a large amount of liquid is supplied to a part of the outer peripheral side of the liquid flow path. In order to prevent the pressure drop in the flow section from increasing, a high energy loss is uniformly imparted to the liquid immediately after the contraction section, and the high energy loss is applied to the contraction section in the cross section of the liquid flowing through the liquid flow path. If a nearly uniform pressure drop is produced in each cross-section of the flow path until the liquid that has passed through the contraction section rejoins and becomes a steady flow in response to the pressure drop, the destruction of vapor bubbles as described above can be achieved. The present inventors have discovered that the generation of destructive shock waves and the resulting noise can be prevented, and have completed the present invention as a result of intensive research.

That is, the present invention provides a multi-tube in which a liquid inlet is opened immediately after a large amount of liquid is supplied to a part of the outer circumferential side of a cross section of a liquid flow path, and an end of the multi-tube that A large number of liquid circulation holes penetrate through the cup-shaped cup that comes into contact with the multi-tube, and the liquid flowing in from the multiple pipes gathers at almost the same point on the center line of the cup in the same cross section, canceling out the force component in the circumferential direction. The present invention provides a high energy loss generating device for liquid, which is characterized by comprising a cup body with a hole formed therein, and fixing means for fixing the cup body and multiple pipes to the wall surface of a liquid flow path.

EMBODIMENT OF THE INVENTION Hereinafter, embodiments of a high energy loss generating device for liquid according to the present invention will be described in detail with reference to the drawings.

FIG. 2 is a perspective view of one embodiment of the high energy loss generating device for liquids according to the present invention, FIG. 3 is a longitudinal sectional view of the same, and FIG. 4 is another example of the high energy loss generating device for liquids according to the present invention. Embodiment FIG. 5 is a longitudinal sectional view showing an embodiment in which a liquid high energy loss generating device according to the present invention is attached to a parallel slide valve.

In the drawings, reference numeral 1 denotes a multiple pipe, and a liquid inlet is opened immediately after a large amount of liquid is supplied to a part of the outer circumferential side of the cross section of the liquid flow path.

This multiple pipe 1 does not necessarily have to be a straight pipe as shown in FIGS. 2 and 3; for example, it may be a spiral pipe, a pipe with unevenness as shown in FIG. A resistor such as a crushed stone material or a fiber material may be separately installed in the path.

2 has a cup shape, such as a conical cup shape, in which the end of the multiple tube 1 is in contact with its outer peripheral surface, and the pointed end of the tip is located on the multiple tube 1 side, and the liquid flowing from the multiple tube 1 is the same. A cup body in which a large number of liquid flow holes 2a are formed through the cup body in such a manner that they gather at almost the same point on the center line of the cup in a cross section to cancel out force components in the circumferential direction. This fixing means 3 is fixed to the wall surface of the liquid flow path, and this fixing means 3 is used to fix the multiple pipes 1 and the cup body 2 in one body as shown in FIGS. 2 and 3. Even if the seven flange portions are provided on the side opposite to the tube 1 side, if the multiple tube 1 and the cup body 2 are separable as shown in FIGS. 4 and 5, the cup body 2 of the multiple tube 1 It may be a perforated plate provided on the opposite side and to which the end of the multiple tube 1 is fixed, and a flange portion provided on the side opposite to the multiple tube 1 side of the cup body 2, and the latter. In some cases, the perforated plate is screwed onto a valve seat fixed to the valve body.

Reference numeral 4 denotes a valve which is the most typical example in which a large amount of liquid is supplied to a part of the outer circumferential side of the flow passage in the cross section of the liquid flow passage. It is configured.

The high energy loss generating device for liquid according to the present invention comprising the multiple pipe 1, the cup body 2 and the fixing means 3 as described above is used as a valve 4.
The case where it is installed will be explained next.

When the valve body 4b of the valve 4 is moved from the closed state to the open state with respect to the valve body 4a, the valve body 4b
At the initial stage of opening, liquid rapidly flows through the gap between the valve body 4a and the valve element 4b, causing a pressure drop in the liquid.

However, since the high energy loss generating device for liquid according to the present invention is present immediately after this valve body 4b, the amount of pressure drop is significantly smaller than that in the case where the device according to the present invention is not present. This means that there is almost no phenomenon in which a portion of the gas changes into a vapor phase.

This is because when the liquid flowing in the gap between the valve body 4a and the valve body 4b in a contracted flow flows into the multiple tube 1 through the opening of the multiple tube 1, the multiple tube 1 communicates in the circumferential direction. As a result, the area of the flow path increases in response to the flow rate, reducing the flow velocity, and the generation of portion A shown in Figure 1 is greatly reduced, thereby preventing the generation of bubbles. Since portion 1 serves as a partition wall, the occurrence of portion B shown in FIG. 1 can be prevented.

Furthermore, in such a multi-pipe tube 1, the steam bubbles are intensively destroyed to induce a destructive shock wave due to the tube friction resistance up to the cup body 2, which has the effect of slowing down the recovery of the pressure drop due to contraction flow. This phenomenon can be prevented.

In this way, the liquid passing through the multi-pipe 1 has a faster flow rate than the liquid flowing on the inner circumference, so if the liquid is allowed to flow directly into the liquid flow path after passing through the multi-pipe 1, it will generate vortices and drift again. occurs, so by making it possible for the liquid flowing out from the liquid flow holes 2a in the same cross section of the cup body 2 to gather at almost the same point on the center line of the cup body 2 and cancel out the force component in the circumferential direction. This creates an even flow throughout.

The above explanation is for the case where the device of the present invention is attached to a valve, but as mentioned above, the device of the present invention can be attached to a part of the outer circumferential side of the flow path in a cross section of the flow path even in a liquid flow path other than a valve. When a large amount of liquid is supplied, a part of the liquid changes to the vapor phase at the contraction part and flows, and when the pressure is restored, the vapor bubble is destroyed and a destructive shock wave is induced, causing noise and liquid flow path. It is very effective in preventing the phenomenon that causes erosion of water, and has the advantage of having a simple structure and being easy to install and use in liquid flow paths.It is especially useful for valves in factory piping. The effect is great when installed, and if a perforated plate is installed on the liquid inlet side of the multiple pipes, it is possible to further enhance the high energy loss effect of the liquid, and the shape and spacing of the multiple pipes can be adjusted depending on the type of liquid and It has various advantages such as being able to be set according to pressure and flow rate, and its industrial value is extremely large.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the liquid flow situation in a conventional valve, and Fig. 2 is an illustration of a high energy loss generating device for liquid according to the present invention.
3 is a longitudinal sectional view of the embodiment, FIG. 4 is a longitudinal sectional view of another embodiment of the high energy loss generating device for liquids according to the present invention, and FIG. 5 is a longitudinal sectional view of the high energy loss generating device for liquids according to the present invention. FIG. 2 is a longitudinal cross-sectional view showing one embodiment of a state in which a high energy loss generating device is attached to a parallel slide valve. DESCRIPTION OF SYMBOLS 1... Multiple pipe, 2... Cup body, 2a... Liquid circulation hole, 3... Fixing means, 4... Valve, 4a... Valve body, 4b... Valve body, A ...The part immediately after the valve body, B.
...A part between part A and part C, C...A part close to the channel wall.

Claims (1)

[Claims] 1. A multiple pipe 1 having a liquid inlet opening immediately after a large amount of liquid is supplied to a part of the outer peripheral side of the cross section of the liquid flow path.
The end of the multi-tube 1 is in a cup shape in contact with its outer peripheral surface, and the liquid flowing from the multi-tube 1 gathers at almost the same point on the center line of the cup in the same cross section and generates a force component in the circumferential direction. A cup body 2 through which a large number of liquid flow holes are bored so as to offset each other, and the cup body 2 and the multiple pipes 1.
A high energy loss generating device for liquid, characterized in that it comprises a fixing means 3 for fixing to a wall surface of a liquid flow path. 2. The high energy loss generating device for liquid according to claim 1, wherein the multiple tube 1 is a straight multiple tube. 3. The high energy loss generating device for liquid according to claim 1, wherein the multiple tube 1 is a multiple tube made of a spiral tube. 4. The high energy loss generating device for liquid according to claim 1, wherein the multiple tube 1 is a multiple tube having concavities and convexities in the conduit. 5. The high energy loss generating device for liquid according to claim 1, wherein the multiple pipe 1 is a multiple pipe in which a resistor is separately installed in the pipe line. 6 The multiple tube 1 and the cup body 2 are integrated, and the fixing means 3 is a flange portion provided on the side of the cup body 2 opposite to the multiple tube 1 side. The high energy loss generating device for liquid according to any one of items 5 to 5. 7 The multiple pipe 1 and the cup body 2 are separable, and the fixing means 3
is a perforated plate fixed to the end of the multiple tube 1 on the side opposite to the cup body 2 of the multiple tube 1, and a flange portion provided on the side of the cup body 2 opposite to the multiple tube 1 side. A high energy loss generating device for liquid according to any one of claims 1 to 5.