JPH0435529Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a silencer installed in a branched pressure fluid passage, etc., and in particular, the invention relates to a silencer that is branched into a pressure fluid passage, etc., and specifically reduces the pressure of released pressure gas quickly by using a punching metal. The present invention relates to a muffling device.

[Prior Art] Generally, a pressure fluid passage that transfers high-pressure fluid is equipped with an air release valve that releases fluid pressure when it becomes excessive. A silencer is installed to reduce the noise generated.

A conventional silencer will be explained based on FIGS. 3 and 4. Reference numeral 1 denotes a pressure fluid passage, for example, a passage for transporting air compressed by a compressor 2 to a blast furnace 3. In this passage 1, high-pressure air with a set pressure of, for example, 5 kg/cm ² g flows at a flow rate of 8000 m ³ /min, and when the air pressure becomes higher than the set pressure, a part of this air is released. It becomes necessary to reduce the pressure. Therefore, a pressure relief passage 4 is branched from the middle of this pressure fluid passage 1, and a blowoff valve 5 is interposed therein, and a muffling device 6 is attached to the tip of the pressure relief passage 4 to prevent noise generated when the pressure fluid is released. It is designed to reduce noise.

An expansion pipe 8 with a relatively large expansion angle is interposed between the inlet 7 of the silencer 6 and the air discharge valve 5, and the expansion pipe 8 has a relatively large expansion angle. It is beginning to be introduced internally. Also,
At the lower part of the silencer 6, a pressure reducing means 12 is formed by stretching a wire mesh 11 around a plurality of support angles 10 which are inclined downward from the inner wall 9a of the main body casing 9 toward the center. Above this, a large number of well-known sound deadening plates 13 made of glass wool or the like sandwiched between two perforated plates are arranged in an intersecting manner in upper and lower stages. The introduced high-pressure gas is further reduced in pressure by the pressure reducing means 12, the generated noise is absorbed by the muffling plate 13, and finally the high-pressure gas is released to the atmosphere from the discharge port 14.

[Problems to be solved by the invention] By the way, in the case of the above-mentioned conventional device,
The flow velocity of the gas introduced into the apparatus was high, and the support angle 10 supported in a cantilever manner pulsated up and down together with the wire mesh 11, causing the inconvenience that the pressure reducing means 12 was blown away.

The present invention focuses on the above-mentioned problems and has been devised to effectively solve them.

SUMMARY OF THE INVENTION An object of the present invention is to provide a muffling device that can quickly reduce the pressure of emitted high-pressure gas using a simple punched metal structure, thereby preventing damage to the inside of the device.

[Means and effects for solving the problems] The structure of the present invention for achieving the above object includes a main body casing which has a sound deadening part inside and an inlet formed below the sound deadening part, and one end of which is An expansion valve connected to the air discharge valve, the other end of which is expanded to an expansion angle of 7° or less to gradually reduce the pressure of the pressure fluid released from the air discharge valve, and located at the inlet of the casing. an open tube, one end of which is connected to the other end of the expansion tube, the other end of which passes through the introduction port and is fixed inside the casing, and is approximately 1/3 of the opening area of the introduction port. Since it consists of a perforated cylinder with a large number of holes having a total area of 1/4, it is possible to gradually reduce the pressure of the fluid without causing damage to the inside of the device.

[Embodiment] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is an external view showing a preferred embodiment of the present invention;
FIG. 2 is a perspective view showing a perforated cylinder which is the main part of the present invention.

As shown in the figure, 9 is a cylindrical main body casing constituting the outer shell of the silencer. An introduction port 7 for introducing pressure fluid such as pressurized gas into the interior of the main casing 9 is formed in the lower side wall of the main casing 9, and a discharge port 14 is formed in the upper part for releasing the introduced fluid into the atmosphere. is formed. Above the introduction port 7 and in the upper part of the main body casing 9, a large number of well-known sound deadening plates 3 made of glass wool or the like sandwiched between two perforated plates are installed in upper and lower stages, and the whole The muffling section 15 is configured as a silencing section 15.

On the other hand, there is a space between the blowoff valve 5 interposed in the pressure relief passage 4 and the lower inlet 7 of the main body casing 9, which is sequentially expanded toward the inlet 7 so that the expansion angle α is 7°.
An expansion pipe 16 having a circular cross section as described below is attached, and is designed to gradually reduce the pressure of the pressurized fluid discharged from the air discharge valve 5. This expansion angle α is made smaller than in the conventional example, and the pressure reduction speed is slightly delayed to prevent rapid pressure reduction. Then, the length of the expansion tube 16 is set so that the gas flow velocity at the inlet 7 is 150 m/s or less.

On the other hand, in order to further reduce the pressure of the pressure fluid introduced from the expansion tube 16, a cylindrical porous tube 17 as shown in FIG. 2 is provided inside the casing of the introduction port 7. There is. Specifically, this porous tube 17 is made of punched metal, and has one end opening connected to the introduction port 7, and the other end fixedly attached to the casing inner wall surface 9b facing the introduction port 17. This porous cylinder 17
has a large number of holes 18 throughout, and the pressure fluid introduced into the porous cylinder 17 is passed through each hole 18...
The pressure of the fluid is further reduced by discharging it from the fluid.

Here, the total opening area of the holes 18 is preferably set to about 1/3 to 1/4 of the inlet opening area s,
If it is too large, the pressure cannot be lowered sufficiently, and conversely, if it is too small, the pressure fluid cannot be discharged sufficiently.

In addition, in the above embodiment, the shape of the porous cylinder 17 was made into a cylindrical shape in order to provide pressure resistance.
Of course, it is not limited to these.

Next, the operation of the present invention configured as above will be explained.

First, approximately 5 kg/cm ² g of pressurized fluid (air, etc.) discharged from the air discharge valve 5 is depressurized while flowing through the expansion tube 16 while gradually expanding its flow path area.
The fluid whose pressure is reduced while flowing through the expansion tube 16 is introduced into the perforated cylinder 17 of the muffler from the inlet 7, and flows out from each hole 18 provided throughout the perforated cylinder while being further depressurized. It ascends inside the main casing 9.

This rising fluid flows through the so-called splitter type muffling section 1.
5, it is released to the atmosphere through the outlet 14.

The noise generated during depressurization, that is, during expansion, is mainly absorbed by the muffling section 15.

In particular, in this embodiment, the expansion angle of the expansion tube 16 is formed to be 7 degrees or less, which is smaller than that of the conventional example, to lower the expansion rate of the pressure fluid, and the inlet port 7
Since the flow velocity was suppressed to 150 m/s or less,
Generation of shock waves can be suppressed.

In addition, a perforated tube 1 is provided on the main body casing side of the inlet 7.
7 and its both ends are securely attached and fixed to the casing inner wall surface 9b, so even if a large shock wave occurs, this porous cylinder 17 will not pulsate and this damage can be prevented. I can do it.

Furthermore, by setting the total opening area of the holes 18 of the porous cylinder 17 to approximately 1/3 to 1/4 of the opening area s of the inlet 7, the pressure fluid can expand while maintaining smooth expansion. Since the shock waves generated due to this can be suppressed to a minimum, the soundness of the porous tube 17 can be further improved.

In the above embodiment, the pipe for supplying high-pressure air from the compressor 2 to the blast furnace 3 has been described as the pressure fluid passage 1, but it is needless to say that the pipe is not limited to this.

[Effects of the Invention] In summary, according to the present invention, the following excellent effects can be achieved.

(1) In addition to connecting a blow-off valve, a perforated cylinder is installed inside the casing of the inlet, so the overall shock wave generated can be suppressed to a minimum.

(2) Since both ends of the perforated cylinder are securely attached and fixed within the main body casing, in addition to being able to suppress the shock wave as described above, this also prevents pulsation of the perforated cylinder and prevents this damage. It can be prevented.

(3) Since the structure is extremely simple, it can be easily adopted into existing equipment without making major design changes.

[Brief explanation of the drawing]

FIG. 1 is an external view showing a preferred embodiment of the present invention;
Fig. 2 is a perspective view showing a perforated cylinder which is the main part of the present invention, Fig. 3 is a configuration diagram showing a silencer installed in a pressure fluid passage, and Fig. 4 is a partially cutaway appearance showing a conventional silencer. It is a diagram. In addition, in the figure, 5 is an air discharge valve, 7 is an inlet, 9 is a main body casing, 15 is a silencer, 16 is an expansion pipe, and 17
is a perforated cylinder.

Claims (1)

[Scope of utility model registration request] In a silencer that releases pressurized fluid released from an air discharge valve to the atmosphere while reducing its retained pressure,
The main body casing has a sound-muffling part inside and an inlet is formed below the sound-muffling part, one end is connected to the air discharge valve, and the other end gradually releases the pressure fluid released from the air discharge valve. The expansion angle is adjusted to reduce the pressure.
An expansion tube that is expanded to 7° or less and is located at the inlet of the casing, one end of which is connected to the other end of the expansion tube, and the other end of which extends through the inlet. A silencer comprising a perforated tube fixed to the inside of a casing and having a large number of holes having a total area of about 1/3 to 1/4 of the opening area of the inlet. .