JPH0540248Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a device for reducing noise generated by fluid jetting out at high speed, and particularly to a device that is effective in muffling noise when jetting steam.

<Prior art and its problems> For example, when high-pressure steam is released into the atmosphere from a safety valve of a boiler equipment, a valve attached to a flash tank, or a blow tank, high-speed steam passes through the throat of the valve. It makes a loud noise when it expands. For this reason, the steam outlet is usually equipped with a device to reduce this noise.

Figures 5 and 6 show conventional steam mufflers. In the figure, the steam ejected from the small hole 51 of the nozzle 50 once travels horizontally, then changes its course, reduces the flow velocity, and some of it rises forming a vortex, and the axis of the device is centered in the center of the device. It ascends in a space divided by sound absorbing plates 52 and 53 formed in a plurality of rows in parallel with each other. During this time, the steam expands and loses its retained energy and some of it becomes condensate. Noise is rapidly reduced due to interference due to this rapid state change, division, and merging, and energy reduction during reflection on the sound absorbing plate. Device main body inner wall and sound absorbing plates 52, 5
3 is formed by covering a sound absorbing material with a metal porous plate having a large number of small holes. Although the device having this configuration has a relatively high noise reduction effect, is compact, and is an effective device, the following drawbacks have been pointed out, and improvement thereof is desired.

First, the steam from the small hole 50 of the nozzle 50 is directed toward the inner wall 55 formed of punched metal.
Since it is injected at high temperature and extremely high flow velocity, the steam blows into the inside of the perforated plate and scatters the sound absorbing material in the areas that receive the steam injection.
A malfunction occurred in which the perforated plate was blown away. For this reason, we had no choice but to sacrifice the sound-absorbing surface area, eliminate the perforated plate in this area, and protect it with a thick plate.

Next, a large amount of condensate is generated due to the steam's adiabatic expansion and decrease in calorific value. However, in the conventional device shown in the figure, since the steam flows almost along the axis of the device, there is no function to separate the generated condensate, and it is released directly into the atmosphere as mist. The mist accompanying the steam falls like rain around the equipment, adversely affecting other equipment and causing a deterioration of the working environment.

<Purpose of the present invention> The present invention was constructed in view of the above-mentioned problems, and the purpose is to provide a sound muffling device that has a simple structure, is easy to assemble, has a large sound muffling effect, and has a drain separation function. shall be.

<Example> FIGS. 1 to 3 show a first example. In the first embodiment, the main body of the apparatus is divided into three parts: 1 is a base, and 2 and 3 are unit sound deadening members connected to the upper part of the base 1. These base portions and unit sound deadening members are integrally connected by flanges to form the main body of the device.

The base 1 has the shape of a tea caddy lid, and has a nozzle 4 erected on the axis of its bottom plate, the upper end of which is closed with a tube, and a plurality of gas injection small holes 4a formed in the tube wall. Furthermore, a drain orifice 1a is formed in this bottom plate. 5 is a sound deadening body disposed coaxially within the cylindrical member 2a of the unit sound deadening member 2;
It is made up of a bottom plate 5a and a side wall 5b, and is shaped like a tea caddy lid.
The space above it is designed to be an open space.
The upper edge thereof is an annular blind plate 6 which is welded and connected to the cylindrical member 2a, so that the muffler 5 is suspended and held. A large number of small holes 5b for gas inflow are formed in the side wall 5b. Further, a small hole 5a for draining is formed in the bottom plate 5a. Next, the space within the muffler 5 is divided into a plurality of spaces by partition plates 7 extending radially from the axis thereof. (In the example shown in FIG. 2, it is divided into four parts.) The partition plate 7 is formed from a sound absorbing material 8 and a perforated plate 8a, and the space formed by the two perforated plates is filled with the sound absorbing material 8. Further, a perforated plate 14 filled with a sound absorbing material is formed on the inner peripheral wall of the cylindrical member 2a.

Another unit silencing member 3 connected to the upper part of the unit silencing member 2 also has a similar structure. However, the overall size is large, that is, the depth of the unit sound deadening member 3 and the inner diameter and depth of the sound deadening body 9 are both the same as the unit sound deadening member 2 and the sound deadening body 5.
The structure is such that the fluid is decelerated in stages. Further, a partition plate 10 having a cross-shaped cross section disposed inside the muffler 9 is displaced approximately 45 degrees as shown in the figure with respect to the partition plate 7 inside the muffler 5, and divides the flow energy of the gas flowing out from the muffler 5. , so that it can be reduced by rectification.

In the device having the above configuration, the small hole 4 of the nozzle 4
After the steam S injected from a consumes energy through adiabatic expansion during ejection and collision with the side wall of the base 1, it reverses and rises, and passes from the annular space of the unit sound-absorbing member 2 through the small hole 5b'. It flows into the muffler 5. In this case, since the inner wall of the base 1 does not form a perforated plate, there is no risk of damage to the perforated plate. Steam is a muffler 5
When it flows into the water, it loses heat due to adiabatic expansion and also generates drainage. The generated drain is separated by inertia when the muffler flows in, and the drain separated inside the muffler is discharged to the outside from the orifice 1a of the base 1 through the drain plate small hole 5a' of the bottom plate 5a.

On the other hand, the steam flowing out from the muffling body 5 flows into the muffling body 9 of the unit muffling member 3 and similarly undergoes adiabatic expansion. In this way, the steam ejected into the device repeats the process of adiabatic expansion and loss of heat in a very short period of time, reduces the flow velocity, and is released into the atmosphere, and the separated condensate flows through the orifice 1a at the bottom of the device. It is then discharged to the outside.

FIG. 4 shows a second embodiment. In this embodiment, another unit silencing member 1 is provided on top of the unit silencing member 3.
1 in series to further enhance the sound deadening effect. Reference numeral 13 denotes a sound deadening plate disposed within the sound deadening body 12, which is further tilted at an angle of about 45 degrees with respect to the sound deadening plate 10.
Displaced, that is, placed at the same position as the sound deadening plate 7,
It is configured to further reduce the flow velocity of steam flowing out from the muffler 5. In this way, each muffling section is integrated with the muffling body, and since these can be connected via the flange, any combination is possible.

When the inventors conducted performance tests using the above-mentioned device, it showed a higher sound reduction than the conventional type in the frequency range of 500 Hz or higher, and the amount of condensate released into the atmosphere was small, compared to the conventional device. In the case of , when saturated steam, etc. was released, condensate fell like rain around the equipment, but with this equipment, such a situation did not occur, and it did not bother workers even if they were nearby. Ta. In addition, with this device, the volume reduction is 48dB.
(In the case of the three-stage type shown in Figure 4), the volume reduction was higher than the 44 dB of the conventional device. Incidentally, if a very high volume reduction is not required, the device may be miniaturized by using a two-stage type as shown in FIG. The sound reduction of this two-stage type was approximately 35 dB. In any case, in the present invention, since the base and the muffling part are each made into a unit, it is possible to freely decide the number of muffling parts to be installed and adjust the volume reduction, and it is also possible to prevent corrosion of parts of the device. Even if damage occurs, only that part can be replaced.

<Effects> Since the present invention has the above-described configuration, it is possible to set a large volume reduction, and the use of a perforated plate in the expected injection section, which was conventionally the most frequently damaged, has been abolished. The life of the device can be significantly extended.

In the device of the present invention, a sealed steam passage is formed by connecting sound deadening bodies that increase in height and volume in the downstream direction of the steam flow, thereby eliminating noise leakage and ensuring sound deadening. .

In addition, the flow of steam is controlled by the small gas inflow holes 5 in the side wall 5b.
As it flows through b' into the large-volume muffler on the downstream side, it undergoes adiabatic expansion, lowering the steam temperature and reducing the retained steam energy, lowering the steam pressure, separating condensed water droplets, and lowering the pressure to reduce the retained steam energy. The reduction in noise reduction has been increased due to the decrease in noise.

At the same time, there is sound absorption using perforated plates and sound absorbing materials.
On the other hand, the reflection of noise sound waves and the effect of sound wave interference within the space partitioned by the cross-shaped partition plates also occur, making noise reduction even more effective.

In addition, since each of the device components is unitized, even if damage should occur, parts can be easily replaced and the impact on the entire plant can be minimized.

Furthermore, since the drain separation ability is high, it is possible to prevent troubles caused by drain discharged from the silencer to the outside.

In addition, since standard type unit sound deadening members can be connected to the base, a sound deadening device with desired performance can be formed by increasing the number of unit sound deadening members according to the sound deadening specifications.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a silencer showing a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is a cross-sectional view taken along line B-B in FIG. FIG. 4 is a longitudinal cross-sectional view of the silencer showing the second embodiment;
The figure is a longitudinal sectional view of a conventional muffler, and FIG. 6 is a sectional view taken along the line CC in FIG. 5. 1... Base, 2, 3, 11... Unit sound deadening member,
4... Nozzle, 5, 9, 12... Sound deadening body, 7, 1
0,13... Sound deadening wall, S... Steam.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A silencer for discharging pressurized steam, which has a plurality of small gas injection holes in a tube wall and has a nozzle closed at the upper end and a drain hole in its bottom plate, and a tea caddy lid. A plurality of small holes for gas inflow are provided in the circumferential wall having a smaller outer diameter than the base, and a tea caddy lid-shaped sound absorbing body with a small drain hole is provided on the bottom plate of the same diameter as the base. The muffler is positioned coaxially within a cylindrical member whose inner surface is lined with a sound-absorbing material, and the open end of the muffler and the upper edge of the cylindrical member are connected by an annular blind plate. and partition the inside of the sound damping body with a plurality of partition plates made of sound damping plates and sound absorbing materials extending radially from the axis of the sound damping body to form a plurality of partition spaces to form a unit sound damping member. A sound muffling device characterized in that two or more unit sound muffling members whose internal diameters and heights are successively increased are stacked one after another on the base and are mutually flange-connected. 2. A sound deadening device according to claim 1 of the utility model registration, characterized in that the sound deadening plate disposed in close contact with the surface of the sound absorbing material is a perforated plate.