JP5042076B2 - Suction device and suction wheel - Google Patents

Description

  The present invention relates to a suction device that sucks and collects an object to be collected in a tank and a suction wheel equipped with the suction device.

  2. Description of the Related Art Conventionally, a suction vehicle that collects collection objects such as sludge, earth and sand, and waste liquid in a tank at a construction work site or a sewage treatment plant and transports these collection objects to a predetermined place such as a treatment plant is known. (For example, refer to Patent Document 1).

  The suction wheel disclosed in Patent Document 1 sucks and collects a collection target in the tank by depressurizing the inside of the tank. In order to depressurize the inside of the tank, the suction wheel is provided with a blower and a dust collecting device that purifies the air that the blower sucks from the tank.

In order to reduce noise generated by the operation of the blower, silencers are provided on the upstream side and the downstream side of the blower.
JP 2006-272985 A

  Noise generated by the operation of the blower can be reduced to some extent by providing silencers on both the suction side and the discharge side of the blower. However, the user wanted to further reduce noise.

  The present invention has been made in view of the above circumstances, and provides a suction device in which noise generated by the operation of the blower is further reduced in a suction device provided with silencers on the suction side and the discharge side of the blower. With the goal. Another object of the present invention is to provide a suction wheel equipped with such a suction device.

As means for solving the above-described problems, the suction device of the present invention is configured as follows. That is, the suction device of the present invention is connected between a receiver tank that collects an object to be collected, a blower that pressurizes and depressurizes air in the receiver tank, and the receiver tank and the suction side of the blower. An upstream dust collector, an upstream silencer connected between the upstream dust collector and the suction side of the blower, a downstream dust collector connected to the discharge side of the blower, and the blower A downstream silencer connected between a discharge side and the downstream dust collector; and a drainage passage for discharging water condensed in the downstream silencer that communicates with the downstream silencer. the downstream dust collector has a reservoir, the drainage channel is characterized that you have communicates the reservoir of the downstream dust collector and the downstream in the silencer.

According to a suction device provided with such a configuration, even if the cooling water is aggregated in the downstream side silencer, agglomerated cooling water is discharged to the outside of the downstream side silencer through discharge water path. Thereby, the fall of the silencing effect by the retention of the cooling water in a downstream silencer can be prevented. In addition, the retention of cooling water in the downstream silencer can be suppressed, so the downstream silencer can be installed close to the blower, and by reducing these distances, an even higher noise reduction effect can be achieved. can get. And since the cooling water of the blower which aggregates in a downstream silencer is sent to the water storage part of a downstream dust collector through a drainage channel, the consumption of cooling water is suppressed.

The suction device of the present invention may be configured as follows. That is, the suction device of the present invention, in the above Ki構 formed, the upstream silencer has an expansion chamber between the air inlet and outlet, said expansion chamber, a large number of holes are formed A porous cylinder with both end openings facing the air inlet and outlet, a first sound-absorbing material sheet wound around the outer peripheral surface of the porous cylinder, and an outer peripheral surface of the first sound-absorbing material sheet A second sound absorbing material sheet, wherein the first sound absorbing material sheet and the second sound absorbing material sheet have different frequency characteristics of sound transmission loss.

  According to the suction device having such a configuration, noise can be reduced in a wide frequency range.

  The suction device of the present invention may be configured as follows. That is, the suction device of the present invention is formed with a plurality of flanges projecting outward from the outer peripheral surface of the porous cylinder, and the first and second sound absorbing material sheets are wound in a state of being overlapped therebetween. It is characterized by being.

  According to the suction device having such a configuration, the first and second sound absorbing material sheets are locked at predetermined positions on the outer peripheral surface of the porous cylindrical body by the flange. It is prevented that the sound-absorbing material sheet is displaced from a predetermined position of the porous cylindrical body and the sound-deadening effect is impaired.

  The suction device of the present invention may be configured as follows. That is, in the suction device of the present invention, the downstream silencer has an expansion chamber between an air inlet and an outlet, and air flowing from the inlet while securing an air flow path on the upper side in the expansion chamber. Is provided with a partition wall standing upright so as to directly spray.

  According to the suction device having such a configuration, since the partition wall as described above is provided in the expansion chamber of the downstream silencer, the silencing effect can be further improved.

  The suction wheel of the present invention is characterized by mounting any one of the suction devices described above, and according to the suction wheel having such a configuration, the same effects as the suction device described above are exhibited.

According to the suction device and the suction wheel according to the present invention, even if the cooling water is aggregated in the downstream side silencer, agglomerated cooling water is discharged to the outside of the downstream side silencer through discharge water path. Thereby, the fall of the silencing effect by the retention of the cooling water in a downstream silencer can be prevented. In addition, the retention of cooling water in the downstream silencer can be suppressed, so the downstream silencer can be installed close to the blower, and these distances are shortened, resulting in a higher noise reduction effect than before. Is obtained.

[External appearance of suction wheel]
Hereinafter, a suction wheel equipped with a suction device according to an embodiment of the present invention will be described with reference to the drawings.

  1 is a left side view showing a suction wheel 2 equipped with a suction device 1 according to an embodiment of the present invention, FIG. 2 is a plan view showing the suction wheel 2, and FIG. 3 is a rear view showing the suction wheel 2. It is.

  In the suction wheel 2, a sub frame 4 is installed on a chassis frame 3 of the vehicle. On the subframe 4, a receiver tank 5 for collecting the collection object is mounted at the rear. Examples of the collection object include sludge, earth and sand, and waste liquid.

  The receiver tank 5 includes a main body 51 having a rear end opening and a tailgate 53 for opening and closing the rear end opening. The tailgate 53 is pivotally supported by the upper rear end portion of the main body 51 via a hinge pin 52 so as to be rotatable. Further, an open / close cylinder 54 is disposed between the main body 51 and the tailgate 53. The tailgate 53 opens and closes the rear end opening of the main body 51 by expanding and contracting the open / close cylinder 54.

  A tank pressure increasing / decreasing pipe 7 is connected to the upper part of the main body 51 of the receiver tank 5. On the lower side of the tailgate 53, there are provided a suction port 8 with an on-off valve that serves as a suction port for the collection target and a discharge port 9 with an on-off valve that serves as a discharge port for the collection target.

  The receiver tank 5 is pivotally supported with respect to the subframe 4 (vehicle body) via a tilting pin 10 so as to be tiltable, and a tilting cylinder 11 is disposed between the subframe 4 and the receiver tank 5. By extending and retracting the tilting cylinder 11, the receiver tank 5 is raised or tilted around the tilting pin 10. In addition, in order to respond | correspond to the rotation operation | movement of the said receiver tank 5, the part is comprised with flexible materials, such as a flexible hose, in the tank pressurization / decompression piping 7. FIG.

  When the suction wheel 2 sucks and collects an object to be collected in the receiver tank 5, the air in the receiver tank 5 is decompressed, and the suction tank 2 enters the receiver tank 5 from the outside through a suction hose (not shown) connected to the suction port 8 with an open / close valve. Aspirate collection object.

  On the other hand, when the suction vehicle 2 discharges the collection object in the receiver tank 5 to a predetermined place (for example, a sludge treatment plant), the air in the receiver tank 5 is pressurized and connected to the discharge port 9 with the on-off valve. The collection object in the receiver tank 5 is discharged to the outside through the discharge hose not to be used. Further, the collection target in the receiver tank 75 can be discharged by opening the tail gate 53 and rotating the receiver tank 75 upright.

  Between the cab 13 and the receiver tank 5, a blower 25, a valve, and other pipes for increasing and decreasing the pressure of the air in the receiver tank 5 are mounted.

[Piping diagram]
Hereinafter, the suction device 1 mounted on the suction wheel 2 will be described based on the piping diagram shown in FIG.

  A tank pressure increasing / decreasing pipe 7 is connected to the receiver tank 5 for supplying or sucking air when the pressure in the receiver tank 5 is increased or decreased. The tank pressurizing / depressurizing pipe 7 branches into a suction pipe 21 and a pressurizing pipe 22 at an intermediate position. A valve V1 that opens and closes the pipe line is provided in the middle of the suction pipe 21, and a valve V2 that similarly opens and closes the pipe is provided in the middle of the pressurizing pipe 22.

  The suction pipe 21 is connected to the suction port 23a of the upstream catcher (cyclone dust collector) 23 at the downstream end. The discharge port 23 b of the upstream catcher 23 is connected to the suction side of the blower 25 via a pipe 24. An upstream silencer 26 is interposed in the middle of the pipe 24. The discharge side of the blower 25 is connected to the air inlet 28 a of the downstream silencer 28 via a pipe 27. The upstream silencer 26 and the downstream silencer 28 will be described in detail later.

  A first outport (air outlet) 28 b of the downstream silencer 28 is connected to an inlet 31 a of a downstream catcher (cyclonic dust collector) 31 through a pipe 30. A valve V3 that opens and closes the pipe line is interposed in the middle of the pipe 30. A pressurizing pipe 22 is connected to the second out port 28 c of the downstream silencer 28. Further, a relief valve 33 for protecting the downstream silencer 28 from abnormal pressure is connected to the third out port 28 d of the downstream silencer 28 via a relief pipe 32.

  The atmospheric bypass port 31 b of the downstream catcher 31 is connected to a midway position of the pipe 24 via the pipe 34. A valve V4 that opens and closes the pipe line is interposed in the middle of the pipe 34.

  The upstream catcher 26 and the downstream catcher 28 are integrally mounted on one tank 35. A partition wall 36 is provided in the tank 35, and dust, water droplets and the like collected by the upstream catcher 22 and the downstream catcher 31 are separately accumulated by the partition wall 36. Hereinafter, the downstream side of the tank 35 with the partition wall 36 as a boundary is referred to as a downstream tank 35a, and the upstream side of the tank 35 is referred to as an upstream tank 35b.

The blower 25 and the downstream tank 35a are communicated with each other by a cooling water supply pipe 40. A valve V5 that opens and closes the pipe line is interposed in the middle of the cooling water supply pipe 40, and the cooling stored in the downstream tank 35a (the water storage part of the downstream catcher 28) with the valve V5 opened. The water is atomized and supplied to the blower 25 side.

  Next, the upstream silencer 26 and the downstream silencer 28 will be described in detail.

  As shown in FIG. 5, the upstream silencer 26 includes an outer cylinder 261, a porous cylinder 262, a first sound absorbing material sheet 263, a second sound absorbing material sheet 264, and the like, and includes an air inlet 26a and an air outlet 26b. The expansion chamber 26c has a larger cross-sectional area than the pipes 24 connected to the inlets 26a and 26b and the upstream silencer 26. The expansion chamber 26c is provided with a porous cylindrical body 262, a first sound absorbing material sheet 263, and a second sound absorbing material sheet 264. The upstream silencer 26 is installed with the air inlet 26a facing upward and the air outlet 26b facing downward.

  As shown in FIG. 6, the outer cylinder 261 includes an outer cylinder main body 261a and a flange portion 261b formed on the air inlet side of the outer cylinder main body 261a. The flange portion 261b corresponds to the size of the first flange 262a of the porous cylinder 262 to be described later. The outer cylinder main body 261a includes a large-diameter portion 261a1 that forms an outer shell of the expansion chamber 26c, a small-diameter portion 261a2 that is smaller in diameter than the large-diameter portion 261a1, and that corresponds to the diameter of the pipe 24, and between these large-diameter portions 261a1 and 261a2. It is comprised by the downstream end surface wall 261a3 used as the air outlet side end surface wall of the continuous expansion chamber 26c.

  As shown in FIG. 7, the porous cylinder 262 is a cylinder such as a cylinder having a large number of holes, and is inserted into the large-diameter portion 261a1 of the outer cylinder main body 261a with a predetermined gap. . Openings at both ends of the porous cylindrical body 262 are disposed so as to face the air inlets / outlets 26a and 26b, and first and second flanges 262a and 262b projecting outward from both ends of the outer peripheral surface are formed. Further, a third flange 262c is also formed that protrudes outward from the intermediate portion of the outer peripheral surface of the porous cylindrical body 262. The first flange 262a on the upstream side is overlapped with the flange portion 261b of the outer cylinder 261 and fastened via a packing 265 with fasteners such as bolts and nuts (not shown) (see FIG. 5). An air inlet 26a corresponding to the diameter of the pipe 24 to be connected is formed in the first flange 262a. In addition, the 2nd flange 262b formed in the downstream edge part is arrange | positioned by providing the clearance gap from the downstream end surface wall 261a3 of the outer cylinder 261. As shown in FIG.

  Further, as shown in FIG. 5, the first sound absorbing material sheet 263 is porous at a total of two locations between the first flange 262a and the third flange 262c and between the third flange 262c and the second flange 262b. It is wound around the outer peripheral surface of the cylindrical body 262. The second sound absorbing material sheet 264 is wound around the outer peripheral surface of the two first sound absorbing material sheets 263. The first sound absorbing material sheet 263 and the second sound absorbing material sheet 264 have different frequency characteristics of sound transmission loss. For example, one of the sound absorbing material sheets has a higher sound transmission loss than the other sound absorbing material sheet in a high frequency range above a predetermined frequency, and the other sound absorbing material sheet is lower than the one sound absorbing material sheet in a low frequency region lower than the predetermined frequency. A thing with high sound transmission loss can be adopted. Thus, by using a plurality of sound absorbing material sheets having different frequency characteristics of sound transmission loss in combination, noise can be reduced in a wide frequency range.

  As shown in FIG. 8, the downstream silencer 28 includes a main body cylinder 281 having an expansion chamber 28 e having a larger flow passage cross-sectional area than pipes 27 and 30 connected to both ends, and a partition wall fixed in the main body cylinder 281. 282 and a drainage channel 283 communicating with the inside of the main body cylinder 281. The downstream silencer 28 is installed so that the direction of the air flow path in the main body cylinder 281 is horizontal.

  At both ends of the main body cylinder 281, an air inlet 28 a connected to the upstream pipe 27 and an air outlet 28 b connected to the downstream pipe 30 are formed. Further, a flange 284 connected to the pressurizing pipe 22 and a flange 285 for connecting to the relief pipe 32 are provided on the side surface in the vicinity of the air outlet 28b.

  The partition wall 282 is erected in the main body cylinder 281 so that air flowing in from the air inlet 28a directly blows while securing an air flow path on the upper side thereof. Further, a bent portion 282a bent toward the air inlet 28a is formed at the upper edge of the partition wall 282, and a drain hole 282b is formed at the lower portion of the partition wall 282.

  The drainage channel 283 is constituted by, for example, a pipe that communicates with the bottom of the main body cylinder 281. The drainage channel 283 communicates the inside of the main body cylinder 281 and the downstream side tank 35a.

[Suction of collected objects]
The case where the air in the receiver tank 5 is depressurized in the above piping configuration will be described. In this case, the valve V1, the valve V3, and the valve V5 are opened, and the valve V2 and the valve V4 are closed.

  After the valve operation, the blower 25 is rotationally driven by the rotational driving force of the engine of the suction wheel 2 so that air is sucked from the suction side of the blower 1 and air is discharged from the discharge side of the blower 1. Then, the air in the receiver tank 5 is sucked into the upstream catcher 23 through the tank pressure increasing / decreasing piping 7 and the suction piping 21 as indicated by solid line arrows along the piping in FIG.

  The upstream catcher 23 includes a processing chamber 23c including a cylindrical cylindrical chamber and a substantially conical conical chamber continuous below the cylindrical chamber. When air containing dust or the like is sucked into the upstream catcher 23, a spiral airflow is generated along the inner wall surface of the processing chamber 23c, and most of the dust or the like falls downward from the lower end opening of the conical chamber. The dust and the like are collected in the water stored in the tank 35b and collected in the tank 35.

  On the other hand, air from which dust or the like has been separated rises in the center of the spiral airflow and is discharged above the upstream catcher 23 from a discharge pipe 23d provided on the upper side in the processing chamber 23c.

  The air discharged upward from the upstream catcher 23 is sucked into the suction side of the blower 25 through the pipe 24 and the upstream silencer 26 interposed in the middle of the pipe 24 and discharged from the discharge side of the blower 25. . At this time, the cooling water is supplied to the blower 25 through the cooling water supply pipe 40, and the cooling water is atomized and mixed into the intake air.

  Air containing cooling water discharged from the discharge side of the blower 25 is drawn into the downstream catcher 31 through the pipe 27, the downstream silencer 28, and the pipe 30.

  The downstream catcher 31 also includes a processing chamber 31c including a cylindrical cylindrical chamber and a substantially conical conical chamber continuous below the cylindrical chamber. When air including dust, cooling water, etc. is sucked into the downstream catcher 31, a spiral air flow is generated along the inner wall surface of the processing chamber 31c, and most of the dust, cooling water, etc. are downward from the lower end opening of the conical chamber. And recovered in the tank 35.

  On the other hand, the air from which dust or the like has been separated in the downstream catcher 31 rises in the center of the spiral air flow and is discharged to the atmosphere from a discharge cylinder 31d provided on the upper side in the processing chamber 31c.

  By the way, when the blower 25 is operated for sucking and collecting the object to be collected into the receiver tank 5, the operating noise propagates in the pipe 24 on the upstream side of the blower 25 and the pipe 27 on the downstream side of the blower 25.

  The operating noise that propagates in the pipe 24 upstream of the blower 25 enters the upstream silencer 26 and is reduced in the upstream silencer 26. That is, the operating noise (sound wave) entering the upstream silencer 26 is reduced by first entering the expansion chamber 26c. Furthermore, the operating noise that has entered the expansion chamber 26c is reduced by sequentially passing through the hole of the porous cylinder 262, the first sound absorbing material sheet 263, and the second sound absorbing material sheet 264. Here, the first sound-absorbing material sheet 263 and the second sound-absorbing material sheet 264 have different frequency characteristics of sound transmission loss, thereby reducing noise in a wide frequency range. For example, the sound absorbing material sheet of the first sound absorbing material sheet 263 has a higher sound transmission loss than the second sound absorbing material sheet 264 in a high frequency range above a predetermined frequency, and the second sound absorbing material sheet 264 has a low frequency range lower than the predetermined frequency. The sound transmission loss can be higher than that of the sound absorbing material sheet 263.

  Further, the resonance noise of the operating noise generated between the blower 25 and the upstream device (for example, the upstream catcher 23) is also reduced by the upstream silencer 26.

  On the other hand, the operating noise of the blower 25 propagating through the pipe 27 on the downstream side of the blower 25 enters the downstream silencer 28 and is reduced in the downstream silencer 28. That is, the operating noise that has entered the downstream silencer 28 is reduced by first entering the main body cylinder 281 serving as an expansion chamber. Further, the operating noise that has entered the main body cylinder 281 is reduced by colliding with the partition wall 282 and causing sound wave interference in the main body cylinder 281.

  Further, the air entering the downstream silencer 28 contains a large amount of cooling water for the blower 25 and the cooling water aggregates in the main body cylinder 281, but the condensed cooling water flows down in the main body cylinder 281. The water is discharged from the drainage channel 283. That is, the cooling water that has flowed into the drainage channel 283 is supplied to the downstream tank 35a. Here, the feeding force is performed by pressure feeding by a differential pressure between the internal pressure in the downstream silencer 28 and the internal pressure in the downstream tank 35a, or by a head differential pressure.

  Further, even if air containing a large amount of cooling water flows into the downstream silencer 28, the cooling water can be discharged from the downstream silencer 28 in a form that can be reused. As a result, it is possible to prevent the silencing effect from decreasing due to the cooling water staying in the downstream silencer 28, and to reduce the consumption of cooling water in the entire apparatus.

Generally, when installing a silencer on the downstream side of the blower, the cooling water stays in the silencer and the noise reduction effect is reduced, so the silencer had to be placed on the air flow path as far as possible from the blower. According to the downstream side silencer 28, the cooling water to agglomerate inside is discharged to the outside through the discharge water path 283, it can be installed close to the blower 25. If the silencer is installed close to the blower 25, a high noise reduction effect can be obtained.

[Discharge processing of collected objects]
Next, the case where the receiver tank 5 is pressurized in the above piping configuration will be described. In this case, the valve V1 and the valve V3 are closed, and the valve V2, the valve V4, and the valve V5 are opened.

  After the valve operation, the blower 25 is rotationally driven by the rotational driving force of the engine of the suction wheel 2 so that air is sucked from the suction side of the blower 25 and air is discharged from the discharge side of the blower 25. Then, as indicated by a broken line arrow along the piping in FIG. 4, the atmosphere is sucked from the discharge cylinder 31 d of the downstream catcher 31, and the air is blown through the atmospheric bypass port 31 b, the piping 34, the piping 24, and the upstream silencer 26. 25 is sucked into the suction side and discharged from the discharge side of the blower 25. Air discharged from the discharge side of the blower 25 is supplied into the receiver tank 5 through the pipe 27, the downstream silencer 28, the pressurizing pipe 22, and the tank pressure increasing / decreasing pipe 7, and the air in the receiver tank 5 is pressurized. .

  When the blower 25 is operated to pressurize the air in the receiver tank 5, the operating noise propagates in the pipe 24 on the upstream side of the blower 25 and the pipe 27 on the downstream side of the blower 25. Also in this case, as described above, the operating noise propagating in the pipe 24 on the upstream side of the blower 25 enters the upstream side silencer 26 and is reduced in the upstream side silencer 26. Further, the operating noise propagating in the pipe 27 on the downstream side of the blower 25 enters the downstream silencer 28 and is reduced in the downstream silencer 28.

  The present invention can be applied to a suction device that sucks and collects an object to be collected in a tank and a suction wheel equipped with the suction device.

It is a left view of the suction wheel which concerns on embodiment of this invention. 1 is a plan view of a suction wheel according to an embodiment of the present invention. It is a rear view of the suction wheel which concerns on embodiment of this invention. It is a piping system diagram of the suction device concerning an embodiment of the invention. It is a figure which shows the upstream silencer which concerns on embodiment of this invention. (A) is a top view, (b) is a longitudinal cross-sectional view. It is a figure which shows the outer cylinder of the upstream silencer which concerns on embodiment of this invention. (A) is a top view, (b) is a longitudinal cross-sectional view. It is a figure which shows the porous cylinder of the upstream silencer which concerns on embodiment of this invention. (A) is a top view, (b) is a longitudinal cross-sectional view. It is a figure which shows the downstream silencer which concerns on embodiment of this invention. (A) is a plan view, (b) is a rear view, and (c) is a left side view.

Explanation of symbols

1 Suction Device 2 Suction Wheel 5 Receiver Tank 23 Upstream Catcher (Upstream Dust Collector)
25 Blower 26 Upstream silencer 26a Air inlet 26b Air outlet 26c Expansion chamber 28 Downstream silencer 28a Air inlet 28b Air outlet 28e Expansion chamber 31 Downstream catcher (downstream dust collector)
35 Tank 35a Downstream tank (water reservoir)
261 outer cylinder 262 porous cylinder 262a first flange 262b second flange 262c third flange 263 first sound absorbing material sheet 264 second sound absorbing material sheet 282 partition wall 283 drainage channel

Claims (5)

A receiver tank for recovering a recovery object; a blower for pressurizing and depressurizing air in the receiver tank; an upstream dust collector connected between the receiver tank and a suction side of the blower; and the upstream An upstream silencer connected between the side dust collector and the suction side of the blower, a downstream dust collector connected to the discharge side of the blower, the discharge side of the blower, and the downstream dust collector A downstream silencer connected to the downstream silencer, and a drainage channel for discharging water condensed in the downstream silencer, the downstream dust collecting device storing water has a section, the drainage channel is a suction device which is characterized that you have communicates the reservoir of the downstream dust collector and the downstream in the silencer. 2. The suction device according to claim 1 , wherein the upstream silencer includes an expansion chamber between an air inlet and an outlet, and a plurality of holes are formed in the expansion chamber so that the opening portions at both ends are A porous cylinder facing each of the air inlet and outlet, a first sound-absorbing material sheet wound around the outer peripheral surface of the porous cylinder, and a second sound-absorbing material sheet wound around the outer peripheral surface of the first sound-absorbing material sheet The suction device is characterized in that the first sound absorbing material sheet and the second sound absorbing material sheet have different frequency characteristics of sound transmission loss. The suction device according to claim 2 , wherein a plurality of flanges projecting outward from the outer peripheral surface of the porous cylindrical body are formed, and the first and second sound absorbing material sheets are overlapped therebetween. A suction device characterized by being wound. Securing the suction device according to any one of claim 1 to 3, wherein the downstream silencer has an expansion chamber between the air inlet and outlet, this expansion chamber, the air passage on the upper side However, a suction device comprising a partition wall standing upright so that air flowing in from the inlet directly blows. A suction wheel comprising the suction device according to any one of claims 1 to 4 .

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