JP2013174324A - Silencing and pressure-reducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently reduce noise from a regulating valve for reducing a pressure of gas, and regulating a flow rate of the gas.SOLUTION: There is provided a silencing and pressure-reducing device in which a cylindrical diffuser 2 having a large number of holes 3 is inserted in a container 1 forming a silencing space therein while a sound absorbing material 9 is internally provided, gas flowing in from an upstream side of the diffuser 2 is pressure-reduced and regulated by a regulating valve 10, and the gas is emitted into the silencing space of the container 1 via the holes 3 in the diffuser 2, and allowed to flow outside to a downstream side from the container 1. In the regulating valve 10, a sleeve-shaped valve element 11 is inscribed or circumscribed with the diffuser 2, the valve element 11 is driven in the axial direction of the diffuser 2 to open/close the holes 3, and the gas is pressure-reduced and regulated. The regulating valve 10 is integrated with the diffuser 2, accommodated in the container 1, and surrounded by the sound absorbing material 9. Thus, noise can be reduced while attaining space saving with simple structure.

Description

  The present invention relates to a muffler / decompressor for reducing pressure and flow of a high-pressure gas such as steam generated in a seawater desalination plant, a thermal power plant, a geothermal power plant, etc., and reducing noise generated at that time.

  For example, when using steam as a heating source, etc., if there is a difference between the pressure and flow rate of the steam supplied from the steam supply source and the pressure and flow rate required by the equipment using the steam, The pressure must be reduced and the flow rate must be adjusted. At that time, high noise may be generated.

  As an apparatus for performing such gas pressure reduction / flow rate adjustment and noise reduction, as shown in FIG. 3, a cylinder having a large number of holes 53 in the lower part of a container 51 whose upper part is opened is shown in FIG. A cylindrical diffuser 52 is inserted sideways, an adjustment valve 54 is connected to the diffuser 52 outside the container 51, and a crushed stone 55 is filled inside the container 51. As the regulating valve 54, a butterfly valve is generally used.

  A water injection pipe 56 is connected to the diffuser 52 of this apparatus so that water stored in the water storage tank 57 can be injected by driving the pump P.

  In this apparatus, when the regulating valve 54 is opened and the steam is sent to the diffuser 52, the steam is dispersed and discharged into the container 51 from the hole 53 of the diffuser 52, and further dispersed in a complicated passage formed by the crushed stone 55. The speed is greatly reduced, the noise accompanying the steam flow is reduced, and when water is injected from the water injection pipe 56, the expansion of the steam is suppressed and the noise is further reduced.

  Further, in Patent Document 2 below, as shown in FIG. 4, a plurality of strip-like sound absorbing materials 58 such as glass wool are arranged in the container 51 in the vertical direction, thereby forming a passage 59 therebetween, and the container 51. A sand layer 60, a rock wool layer 61, and a lead plate 62 are sequentially provided from the inside to the outside around the lower portion of the steel plate to reduce noise caused by steam released from the hole 53 of the diffuser 52 when the regulating valve 54 is opened. Has been.

Japanese Patent Laid-Open No. 62-237019 Japanese Patent Publication No. 6-63446

  However, in the above silencing and depressurizing device, noise due to the steam discharged from the hole 53 of the diffuser 52 is reduced, but a large noise is also generated from the regulating valve 54, and measures such as covering the regulating valve 54 with a separate sound absorbing material are taken. Otherwise, there is a problem that this noise cannot be reduced.

  Accordingly, an object of the present invention is to efficiently reduce noise from a regulating valve that performs pressure reduction and flow rate adjustment of gas.

  In order to solve the above-described problems, the present invention adjusts the gas flowing in from the upstream of the diffuser by inserting a cylindrical diffuser having a large number of holes into a container in which a sound absorbing material is internally formed to form a silencing space. In the noise reduction pressure reduction device that adjusts the pressure reduction by a valve, discharges it to the sound deadening space of the container through the hole of the diffuser, and flows out from the container to the downstream side. The valve body is driven in the axial direction of the diffuser to open and close the hole and adjust the pressure of the gas under reduced pressure.

  Further, in the silencer and pressure reducing device in which the valve body is inscribed in the diffuser, a sound absorbing material is fixed on the outer periphery of the diffuser so as to surround a portion having a hole.

  In the noise reduction and decompression device according to the present invention, the adjustment valve is integrated with the diffuser, and is housed in a container and surrounded by the sound absorbing material. Therefore, it is not necessary to cover the adjustment valve with a sound absorbing material different from the diffuser, Noise can be reduced while saving space with a simple structure.

1 is a schematic cross-sectional view showing a noise reduction and decompression device according to a first embodiment of the invention. Schematic sectional view showing a muffler and decompressor according to the second embodiment Schematic cross-sectional view showing the silencer and decompressor described in Patent Document 1 Schematic sectional view showing the silencer and decompressor described in Patent Document 2

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  In the first embodiment shown in FIG. 1, a cylindrical diffuser 2 is inserted vertically into a steel container 1 composed of a cylindrical peripheral wall, a bottom wall, and a top wall, and the middle of the peripheral wall of the diffuser 2. A number of holes 3 are provided below the part.

  A pipe 4 that passes through the top wall of the container 1 and curves in an L shape is connected above the diffuser 2, and a pipe 5 that reaches the bottom wall of the container 1 is connected below the diffuser 2.

  An outlet 6 is provided on the peripheral wall of the container 1, and a drain valve 8 is connected to the bottom wall of the container 1 via a thin pipe 7 inside a portion where the pipe 5 reaches.

  On the inner surface of the peripheral wall, bottom wall, and top wall of the container 1, a sound absorbing material 9 having a high sound insulating property such as ceramic is fixed except for a through portion of the pipe 4, a joint portion of the pipe 5 and a portion of the outlet 6. A silencing space is formed inside the container 1.

  A sleeve-like valve body 11 having at least a cylindrical outer surface is inscribed in the diffuser 2 so as to be slidable in the vertical direction. The inner periphery of the valve body 11 may have an arbitrary shape, but in this example, is a cylindrical surface. On the outer periphery of the valve body 11, packing is provided for sealing between the inner periphery of the diffuser 2.

  The upper end portion of the valve body 11 is provided with a holding member 12 that is open except for the central portion and the radial beam portion so as not to obstruct the flow path, and the lower end portion of the valve rod 13 is attached to the central portion. Yes.

  The valve stem 13 extends upward in the diffuser 2 and the pipe 4, is supported by the bushes 14 and 15 so as to be slidable in the vertical direction, and reaches the actuator 16 having a handle via the branch portion of the pipe 4.

  A stopper 17 that receives the lower end of the valve body 11 protrudes from the lower inner surface of the diffuser 2, thereby defining a lower limit of the sliding range of the valve body 11.

  A sound absorbing material 18 is fixed to the outer periphery of the diffuser 2 so as to surround a portion having the hole 3. As the sound absorbing material 18, a breathable material such as a metal cotton material or glass wool is used.

  When such a silencing pressure reducing device is used for facilities using steam in various plants or the like, in a state where the valve body 11 descends and closes the hole 3, the steam flowing into the diffuser 2 through the pipe 4 is a container. 1 is not released into the sound deadening space inside 1, and the outflow of steam from the outlet 6 is stopped.

  On the other hand, when the valve body 11 rises and the hole 3 is opened, steam is discharged from the diffuser 2 through the hole 3 to the sound deadening space of the container 1 and flows out from the container 1 through the outlet 6 to the downstream side. . This outflow amount can be adjusted by moving the valve body 11 up and down to an arbitrary position in accordance with the operation of the actuator 16 and changing the number of holes 3 to be opened.

  The noise generated when the steam passes through the hole 3 is absorbed by the sound absorbing material 18 on the outer periphery of the diffuser 2 and the sound absorbing material 9 housed in the container 1.

  As described above, in the above silencer and decompression device, the portion having the hole 3 of the diffuser 2 that is a noise generating source constitutes the regulating valve 10 together with the valve body 11, which is surrounded by the sound absorbing material 18 and surrounded by the sound absorbing material 9. Since it is housed in the sound deadening space, a high sound deadening effect can be expected. Since the diffuser 2 and the regulating valve 10 also serve as the sound absorbing materials 9 and 18, space saving can be achieved.

  In the first embodiment, the valve body 11 is inscribed in the diffuser 2. However, as in the second embodiment shown in the sideways state in FIG. 2, the valve body has at least an inner periphery that is a cylindrical surface. 11 may be circumscribed by the diffuser 2.

  In this case, the valve body 11 is driven in the axial direction of the diffuser 2 by rotating the valve rod 19 screwed into the overhanging portion of the outer periphery of the valve body 11 by the servo motor 20 attached to the container 1. Good.

  In this case, as shown in FIG. 2, the upstream pipe 4 and the outlet 6 can be arranged in a straight line.

  In addition, the noise reduction pressure-reduction apparatus which concerns on this invention can also be employ | adopted for piping which discharges gas, such as a vapor | steam, from a plant etc. in air | atmosphere. In this case, noise generated in the atmosphere is a particular problem, and thus the effect of the silencer and pressure reducing device is further exhibited.

DESCRIPTION OF SYMBOLS 1 Container 2 Diffuser 3 Hole 4, 5 Piping 6 Outlet 7 Piping 8 Drain valve 9 Sound absorbing material 10 Adjusting valve 11 Valve body 12 Holding member 13 Valve rod 14, 15 Bush 16 Actuator 17 Stopper 18 Sound absorbing material 19 Valve rod 20 Servo motor

Claims (2)

  A cylindrical diffuser (2) having a large number of holes (3) is inserted into a container (1) in which a sound-absorbing material (9) is built to form a sound deadening space, and flows in from the upstream of the diffuser (2). In the silencer decompression device that adjusts the pressure by the regulating valve (10), discharges the gas into the silenced space of the container (1) through the hole (3) of the diffuser (2), and flows out from the container (1) to the downstream side. The adjusting valve (10) has a sleeve-shaped valve body (11) inscribed or circumscribed on the diffuser (2), and the valve body (11) is driven in the axial direction of the diffuser (2) by a hole ( A muffler / decompression device characterized in that the gas is decompressed and adjusted by opening and closing 3).   The noise reduction and decompression device according to claim 1, wherein the valve body (11) is inscribed in the diffuser (2), and a sound absorbing material (so as to surround a portion having a hole (3) on the outer periphery of the diffuser (2). 18) A muffler and decompressor characterized by being fixed.

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