JP2010036775A - Blower-mounted vehicle, and fixed type suction device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a silencing mechanism capable of demonstrating an effective silencing function even under a strict limit to an arrangement area of a suction work machine apparatus, and the mountable weight. <P>SOLUTION: A blower-mounted vehicle includes a blower body 2 mounted on the vehicle, a treatment device mounted on the vehicle to execute the predetermined treatment, a main piping passage 5 with one end thereof being connected to the blower body and the other end thereof being connected to the treatment device, and a branch pipe 6 connected to a branch part provided in a middle part of the main piping passage. A fore end of the branch pipe is blocked by a reflecting plate for reflecting the sound wave generated from the blower body, and the distance from the branch part to the reflecting surface of the reflecting plate is 1/4 of the wavelength of the sound wave. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a blower-equipped vehicle and a stationary suction device, and more particularly to a blower-equipped vehicle and a stationary suction device that can minimize noise generated from the blower and minimize the required equipment layout area.

  Noise reduction can be cited as a quality requirement for construction machinery. In particular, high-power suction work vehicles used for gutter cleaning work often operate at night to avoid obstructing traffic during the daytime, and it is an urgent task to solve the problem of reducing noise. .

Patent Document 1 discloses an example of a suction work vehicle.
FIG. 26 shows a suction system mounted on the suction work vehicle of Patent Document 1.
The suction system mounted on the suction work vehicle disclosed in Patent Document 1 includes a water tank (T) downstream of the blower (D), and allows air discharged from the blower (D) to pass through the water tank (T). The sound is muted.

Japanese Examined Patent Publication No. 61-26407

Although the above-mentioned suction work vehicle has taken measures to mute, it still emits noise of about 100 dB (A) as an overall value.
As an alternative method of the silencing method for the suction work vehicle disclosed in Patent Document 1, it is conceivable to use an expansion silencer. However, inflatable silencers to achieve a sufficient silencing effect are large and heavy, especially for in-vehicle suction work machines where the placement area of the suction work machine equipment and the weight that can be mounted on the vehicle are severely limited This alternative is unsuitable.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a silencing mechanism that provides an effective silencing action even under severe restrictions on the suction work machine equipment layout area and mountable weight. . A further object of the present invention is to provide a blower-equipped vehicle and a stationary suction device having such a silencing mechanism.

The invention according to claim 1 is a vehicle including a cargo bed frame, a blower body fixed on the cargo bed frame, a wet dust collecting tank fixed on the cargo bed frame and connected to a suction port of the blower body. A suction pipe, and a mist catcher / water tank that is fixed on the carrier frame and connected to the discharge port of the blower body, and is connected to the internal space of the wet dust collection tank. The main pipe connecting the catcher / water tank has a branch part in the middle thereof, the branch pipe extends upward with the branch part as a base end, and the tip of the branch pipe extends from the blower body. The blower-equipped vehicle is blocked by a reflecting plate that reflects the generated sound wave, and the distance from the branching portion to the reflecting surface of the reflecting plate is ¼ of the wavelength of the sound wave. .
The invention according to claim 2 further includes a cooling water conduit that extends from a lower portion of the mist catcher and water tank and communicates with a connection pipe that connects the wet dust collecting tank and the blower body suction port, 2. The blower according to claim 1, wherein the main pipeline includes an inclined pipeline portion that is inclined downward immediately after connection with the blower body, and the branch portion is formed in the inclined pipeline portion. It is an on-board vehicle.
A third aspect of the present invention is the blower-equipped vehicle according to the second aspect, wherein an opening is formed in the peripheral wall of the cooling water conduit.
A fourth aspect of the present invention is the blower-equipped vehicle according to the second or third aspect, wherein a flow meter is disposed in the middle portion of the cooling conduit.
The invention according to claim 5 is the blower mounting according to any one of claims 2 to 4, wherein the cooling conduit is connected to the connecting pipe after forming an inverted U-shaped path curved upward. It is a car.

According to a sixth aspect of the present invention, there is provided a blower body mounted on a vehicle, a processing device mounted on the vehicle and performing a predetermined process, one end connected to the blower body, and the other end connected to the processing device. And a branch pipe connected to a branch portion provided in the middle of the main pipe, and the tip of the branch pipe is blocked by a reflector that reflects sound waves generated from the blower body. The blower-equipped vehicle is characterized in that the distance from the branch portion to the reflecting surface of the reflecting plate is ¼ of the wavelength of the sound wave.
According to a seventh aspect of the present invention, the branch pipe includes a base end pipe located on the main pipe side and a terminal pipe threadably connected to the base end pipe, and the shaft of the branch pipe is rotated by the rotation of the end pipe. The blower-equipped vehicle according to claim 6, wherein the long dimension changes.

The invention according to claim 8 is the step of creating one numerical calculation model relating to a system in which the branch pipes are arranged such that the blower body, the processing device, and the main pipe line, and the blower body and the processing device. A step of creating a plurality of other numerical calculation models related to the system consisting of the main pipe and the branch pipe, and in the one numerical calculation model, the numerical calculation is executed using the blower body as a sound source to calculate a sound pressure level. Calculating the sound pressure level by using the blower body as a sound source in each of the other numerical calculation models, calculating from the one numerical calculation model and the other numerical calculation model. Calculating a difference between the sound pressure levels and a step of comparing the difference values of the sound pressure levels. And the step of comparing the difference values of the sound pressure levels includes a step of selecting a numerical calculation model that maximizes the absolute value of the difference value from among the plurality of other numerical calculation models. The blower-equipped vehicle according to claim 6 or 7.
The invention according to claim 9 is the blower-equipped vehicle according to claim 8, wherein the sound source is a surface sound source.

According to a tenth aspect of the present invention, the blower body is a two-stage integrated blower body or a blower body in which the first blower and the second blower are connected, and the surface sound source is the first stage of the blower body. The blower-equipped vehicle according to claim 9, wherein the pair of surface sound sources vibrate in the same phase, which are defined in eyes and second stages or in the first blower and the second blower.
The invention according to an eleventh aspect is the blower-equipped vehicle according to any one of the eighth to tenth aspects, wherein the calculation using the numerical calculation model is a three-dimensional boundary element analysis.
According to a twelfth aspect of the present invention, the processing apparatus includes an extension pipe, and the extension pipe prevents a resonance phenomenon between the sound wave from the blower body and the processing apparatus. It is a car equipped with a blower described in 1.
A thirteenth aspect of the present invention is directed to a blower main body that sucks and discharges fluid, a processing device that performs a predetermined process, a main pipe line that has one end connected to the blower main body and the other end connected to the processing device. A branch pipe connected to a branch portion provided in the middle of the main pipeline, and a distal end portion of the branch pipe is blocked by a reflecting plate that reflects sound waves generated from the blower body, The distance to the reflecting surface of the reflector is ¼ of the wavelength of the sound wave, and the branch pipe is located on the main pipe side and the proximal end pipe is screwed to the proximal pipe. A numerical calculation related to a system in which the axial length of the branch pipe is changed by the rotation of the end pipe, and the arrangement position of the branch pipe is the blower body, the processing device, and the main pipe line Creating a model, the blower body, and the processing A plurality of other numerical calculation models related to a system comprising the main pipe and the branch pipe, and in the one numerical calculation model, the numerical calculation is performed using the blower body as a sound source, and the sound pressure level is determined. In each of the other numerical calculation models, the numerical calculation is performed using the blower body as a sound source, and the sound pressure level is calculated. From the one numerical calculation model and the other numerical calculation model, The step of calculating the difference of the calculated sound pressure level and the step of comparing the difference value of the sound pressure level are determined, and the position of the branch portion is different between each of the other numerical calculation models, The step of comparing the difference values of the sound pressure levels includes a step of selecting a numerical calculation model that maximizes the absolute value of the difference values from the plurality of other numerical calculation models. A stationary suction device for.

According to a fourteenth aspect of the present invention, there is provided a blower body mounted on a vehicle, a processing device mounted on the vehicle and performing a predetermined process, one end connected to the blower body, and the other end connected to the processing device. A main pipe connected to the main pipe, and a branch pipe connected to the main pipe. The main pipe includes a first pipe connected to the blower body, a second pipe connected to the processing apparatus, and the first pipe. A connecting pipe that connects the second pipe, the connecting pipe includes a branching section, the branch pipe including a proximal end pipe positioned on the branching section side, and a terminal pipe threadably connected to the proximal end pipe; And a reflecting plate that closes the tip between the ends and reflects sound waves generated from the blower body, and the distance from the branching portion to the reflecting surface of the reflecting plate is a quarter of the wavelength of the sound waves. The connecting pipe is upstream and downstream of the proximal pipe In comprising a bellows tube portion, a blower mounted vehicle, characterized in that the branching position from the main line of the base end pipe which is displaceable.
The invention according to claim 15 further includes a cylinder connected to a midway portion between a pair of bellows tube portions of the connection tube among the connection tubes, and the expansion and contraction of the rod of the cylinder causes the base tube to The blower-equipped vehicle according to claim 14, wherein the branch position is displaced.
According to a sixteenth aspect of the present invention, there is provided a blower body mounted on a vehicle, a processing device mounted on the vehicle and performing a predetermined process, one end connected to the blower body, and the other end connected to the processing device. And a branch pipe connected to a branch portion provided in the middle of the main pipe, and the tip of the branch pipe is blocked by a reflector that reflects sound waves generated from the blower body. The blower-equipped vehicle is characterized in that the distance from the branch portion to the reflecting surface of the reflector is determined by the number of rotor leaves and the standard rotational speed of the blower body.

According to the first aspect of the present invention, since the branch pipe type silencing mechanism is adopted, a large area is not required for mounting the silencing mechanism, and an increase in the vehicle weight is minimized, which is effective. A silencing effect can be obtained. In addition, it is possible to suitably perform dust collection work on the road.
According to the second aspect of the present invention, by branching the branch pipe from the inclined pipe section, the noise reduction effect by the branch pipe is not hindered by the blower cooling water.
According to the third aspect of the present invention, an excessive amount of cooling water can be prevented from flowing into the blower, and the supply of cooling water does not reduce the silencing effect.
According to invention of Claim 4, the flow of the cooling water in the water conduit for cooling can be detected, and it becomes possible to cool a blower reliably.
According to invention of Claim 5, it becomes possible to determine suitably the connection position of a connection pipe and the water conduit for cooling irrespective of the water surface position in a mist catcher and water tank.

According to the inventions of claims 6 and 16, since the branch pipe type silencing mechanism is adopted, a large area is not required for mounting the silencing mechanism, and an increase in the weight of the vehicle is minimized. An effective silencing effect can be obtained.
According to the seventh aspect of the present invention, it is possible to cope with a change in the wavelength of sound from the blower main body caused by a change in the processing environment such as a temperature change of the fluid passing through the main pipeline, and reliably at the processing work site It is possible to obtain a silencing effect. Moreover, it becomes possible to deal with equipment changes in the suction processing system mounted on the vehicle, such as changing the blower type.

According to the eighth aspect of the invention, since the numerical calculation model including the processing devices arranged downstream or upstream of the blower is made, even in a system including a group of processing devices that are densely packed, the sound wave emitted from the blower is The stomach can be accurately determined. Therefore, the branch pipe can be reliably arranged at the position of the antinode of the sound wave, and the silencing effect by the branch pipe can be maximized.
According to the ninth to eleventh aspects of the present invention, the error between the simulation result using the numerical calculation model and the actual measurement value can be minimized, and the noise generated from the actual blower-equipped vehicle can be surely reduced. It becomes possible.

According to invention of Claim 12, the resonance phenomenon between the sound wave from a blower and a processing apparatus can be avoided, and the noise level from a vehicle equipped with a blower can be further reduced.
According to the thirteenth aspect of the invention, since the branch pipe type silencing mechanism is employed, an effective silencing effect can be obtained without requiring a large area for mounting the silencing mechanism. In addition, it is possible to cope with a change in the wavelength of sound from the blower due to a change in the processing environment such as a change in the temperature of the fluid passing through the main pipeline, and it is possible to reliably obtain a silencing effect at the processing work site. In addition, it is possible to cope with equipment changes in the suction processing system such as changing the blower type. In addition, the position of the branch pipe that exhibits the silencing effect is determined based on the simulation result of the sound pressure reduction effect using the numerical calculation model including the processing device arranged downstream or upstream of the blower. It is surely arranged at the position of the antinode of the sound wave emitted by the blower, and the silencing effect by the branch pipe is maximized.
According to the fourteenth and fifteenth aspects, the position of the branch pipe on the main pipe can be adjusted, and the silencing effect by the branch pipe can be maximized at the processing site.

Hereinafter, a blower-equipped vehicle and a stationary suction device that perform suction processing according to the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view of an air discharge mechanism of a suction processing system mounted on a blower-equipped vehicle of the present invention.
The air discharge mechanism (1) shown in FIG. 1 mainly includes a tertiary catcher (3) and a roots blower (2) that are located upstream of the roots blower (2) and the roots blower (2) and communicate with the roots blower (2). The quaternary catcher (4) is located downstream and connected to the roots blower (2). The roots blower (2) and the quaternary catcher (4) are connected by the main pipe line (5).
The tertiary catcher (3) cleans the air sent to the blower (2), and the fourth catcher (4) cleans the air released to the outside air.

The main pipeline (5) includes an elbow pipe (51) in the middle thereof. The elbow pipe (51) branches off from the fluid discharge path connected to the quaternary catcher (4) from the roots blower (2) and curves upward. The elbow pipe (51) includes a flange part (511) at its tip.
The branch pipe (6) is placed and fixed on the flange part (511) of the elbow pipe (51). The upper surface of the flange portion (511) of the elbow pipe (51) is parallel to the surface of the vehicle bed on which the suction processing system is installed, and stably supports the branch pipe (6) on the flange portion (511). Is possible.
The branch pipe (6) includes a proximal end pipe (61) connected to the elbow pipe (51) and a distal end pipe (62) connected to the proximal end pipe (61) by screwing. A flange portion (611) is formed at the lower end portion of the proximal end tube (61). The flange part (511) of the elbow pipe (51) and the flange part (611) of the proximal end pipe (61) are overlapped with each other, and these flange parts (511, 611) are attached using an appropriate fixing tool such as a bolt. They will be fixed to each other.

FIG. 2 shows the detailed structure of the branch pipe (6) used in the present invention. In FIG. 2, the left half shows the cross-sectional structure of the branch pipe (6), and the right half shows the appearance of the branch pipe (6).
As described above, the branch pipe (6) includes the proximal end pipe (61) and the distal end pipe (62), and a flange portion (611) is formed at the lower end of the proximal end pipe (61).
The base end portion (61) is located at the upper end of the cylindrical portion (612) and the cylindrical portion (612) that extends upward from the flange portion (611), and is more than the cylindrical portion (612). An annular tip (613) having a large outer contour is further provided. A thread groove is formed on the outer peripheral surface of the cylindrical portion (612). An O-ring groove (131) is formed along the outer peripheral surface of the tip (613). An O-ring is arranged in the O-ring groove (131), and the O-ring is compressed between the bottom surface of the O-ring groove (131) of the tip end portion (613) and the inner peripheral surface of the end pipe (62), and is branched. (6) Seal the internal space.
The end tube (62) includes a cylindrical tubular portion (621) and an annular flange portion (622) that is located at the upper end of the tubular portion (621) and projects radially from the tubular portion (621). . The end tube (62) further includes a reflector (623) mounted and fixed on the flange portion (622). The reflector (623) reflects the sound wave transmitted into the branch pipe (6) through the elbow pipe (51). When the total length from the elbow pipe (51) proximal end to the branch pipe (6) tip is equal to ¼ of the wavelength of the sound wave emitted from the blower (2), the sound wave reflected by the reflector (623) is The sound wave from the blower (2) has an opposite phase, and the sound wave from the blower (2) is canceled.
The inner diameter dimension of the cylindrical part (621) of the end pipe (62) is larger than the outer dimension of the base end pipe (61), and the end pipe (62) fits the base end pipe (61). A screw part (211) projecting inward from the inner wall of the terminal pipe (62) is formed on the inner wall part at the lower end of the terminal pipe (62), and the screw part (211) is a cylindrical part of the proximal pipe (61) ( 612) It is screwed with a thread groove formed on the outer peripheral surface. As a result, when the end tube (62) is rotated, the end tube (62) is displaced in the axial direction of the branch tube (6). Therefore, the total length of the branch pipe (6) is adjusted, and the distance from the base end of the elbow pipe (51) to the reflection surface of the reflector (623) is ¼ the length of the sound wave emitted from the blower (2). Can be matched.

FIG. 3 is a flowchart of a method for determining the branch position of the branch pipe (6).
The branch position of the branch pipe (6) from the main pipe (5) is determined through a numerical calculation model creation stage, a numerical calculation execution stage, and a numerical calculation result comparison stage.

FIG. 4 shows the numerical calculation model created in the numerical calculation model creation stage. The numerical calculation model shown in FIG. 4 is an analysis model for three-dimensional boundary element analysis. The model shown in FIG. 4 does not include the branch pipe (6). The numerical calculation model shown in FIG. 4 is created using general boundary element analysis software WAON manufactured by Cybernet System Co., Ltd.
The numerical calculation model (10) shown in FIG. 4 simulates the air discharge mechanism (1) shown in FIG. The numerical calculation model (10) has 10,000 contacts and 6000 elements. The numerical calculation model (10) models from the receiver tank (7) of the suction processing system to the outlet of the fourth catcher (4).
In the numerical calculation model (10), the volume of the blower (2) is not considered. In the numerical calculation model (10), a two-stage roots blower having two three-leaf blower rotors and a rotational speed of 1560 rpm is assumed, but the blower (2) used in the present invention is limited to this. It is not something. Furthermore, for the purpose of simplifying the model creation, fine parts such as suction pipes, fullness devices and wave-eliminating plates provided in the suction system are omitted, and all curved pipes such as elbow pipes are replaced with straight pipes. .

In the numerical calculation model (10), the receiver tank (7) is located on the uppermost stream. A first straight pipe (71) extends from the receiver tank (7), and the first straight pipe (71) is connected to the tertiary catcher (3). A second straight pipe (72) extends from the tertiary catcher (3). The second straight pipe (72) extends in a direction perpendicular to the first straight pipe (71) and is connected to the quaternary catcher (4).
Two sound sources (S1, S2) are defined in the second straight pipe (72). The sound source (S1) located on the upstream side is defined as the position of the suction port of the first stage blower, and the sound source (S2) located on the downstream side is defined as the position of the discharge port of the second stage blower. The section of the second straight pipe (72) from the sound source (S2) to the quaternary catcher (4) corresponds to the main pipe line (5) shown in FIG. In the numerical calculation model creation stage, a plurality of numerical calculation models are further created in which the branch pipes (6) are arranged at different positions in the section corresponding to the main pipeline (5).

FIG. 5 shows a model of the sound source (S1, S2) in the numerical calculation model (10).
The sound sources (S1, S2) are defined as surface sound sources. The surface of the sound source (S1, S2) is assumed to vibrate at a speed of 1 in the normal direction of the surface and at a speed of -1 in the reverse normal direction, and the vibration of the surface of the sound source (S1, S2) is in phase. is there.

In the numerical calculation execution stage, one element in the numerical calculation model is determined as an observation point, and the sound pressure at the observation point is calculated for each numerical calculation model (10) created in the numerical calculation model creation stage.
Thereafter, the sound pressure at the observation point calculated from the numerical calculation model (10) not including the branch pipe (6), and the sound pressure at the observation point calculated from the numerical calculation model (10) including the branch pipe (6) Is calculated (insertion loss).

FIG. 6 shows an example of the calculation result obtained by executing the above numerical calculation stage, and FIG. 7 shows the position of the observation point used for calculation of the calculation result of FIG.
The numerical calculation results shown in FIG. 6 are obtained by using one element of the quaternary catcher (4) exit portion as an observation point, as shown in FIG. Further, in the numerical calculation model creation stage, one numerical calculation model (10) not including the branch pipe (6) is generated, nine numerical calculation models (10) including the branch pipe (6) are generated, and insertion loss is generated. And the result shown in FIG. 6 is obtained.
The distance from the sound source (S2) to the branch pipe (6) in the numerical calculation model (10) including the branch pipe (6) is 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm for each numerical calculation model (10). , 200 mm, 250 mm, and 300 mm.
The assumed frequency of the sound wave is 155 Hz, and the distance from the base end of the elbow tube (51) to the reflecting surface of the reflecting plate (623) is 650 mm.

  In the numerical calculation comparison stage, the insertion loss values obtained from the respective numerical calculation models (10) are compared. In the example shown in FIG. 6, a high insertion loss value is shown when the distance between the sound source (S2) and the branch pipe (6) is in the range of 100 mm to 150 mm. Therefore, it can be seen that a high silencing effect can be obtained if the branch pipe (6) is branched from a position separated from the blower (2) discharge port by a distance of 100 mm to 150 mm.

(Test Example 1: Identification of noise factors)
The following are some test examples that prove the effectiveness of the present invention.
FIG. 8 is a diagram illustrating a noise level measurement mode using a normal vehicle equipped with a suction processing system without a silencing mechanism, and is a plan view of the vehicle equipped with the suction processing system.
FIG. 8 shows measurement point positions of noise measurement for a vehicle equipped with a normal suction processing system. In this test, noise levels were measured at five measurement points.
Measurement point 1 is a position 1 m away from the passenger seat side center. The measuring point 2 is a position 1 m away from the driver seat side center. Measurement point 3 is a position 100 mm away from the blower forward of the vehicle. Measurement point 4 is a position 100 mm away from the blower outlet. The measurement point 5 is a position 100 mm away from the blower suction port.

FIG. 9 is a graph for analyzing the frequency characteristics at the measurement point 1. 9A shows the frequency characteristic distribution in the range from 0 Hz to 5000 Hz, and FIG. 9B shows the frequency characteristic distribution from 0 to 1000 Hz.
As is clear from FIG. 9A, the noise emitted from the vehicle is dominated by sound components having a frequency of 1000 Hz or less. Moreover, the peak value is shown by the frequency of 150 Hz and 294 Hz from the data shown in FIG.9 (b).
Equation 1 below is a theoretical value of the pressure pulsation frequency calculated from the specifications of the roots blower (2). As described above, the roots blower (2) includes two three-leaf blower rotors and the number of rotations is 1560 rpm.

The pulsation frequency of the roots blower (2) substantially matches the peak value of 150 Hz shown in FIG. The peak value 294 Hz is considered to be a harmonic component of the peak value 150 Hz component.
Therefore, it can be seen that eliminating the sound component emitted from the roots blower (2) is most effective in reducing the overall noise level emitted from the vehicle.

  From the specification standard of the roots blower (2) used in this test example, the temperature of the discharge port can be assumed to be 100 ° C. The sound speed c at this time can be calculated by the following formula 2.

  The distance L from the elbow tube (51) base end portion for erasing the 150 Hz sound component to the reflecting surface of the reflector (623) can be calculated by the following equation (3) using the calculation result by the equation (2).

(Test Example 2: Difference due to numerical calculation model)
FIG. 10 shows a two-dimensional numerical calculation model (100) as a comparative example to the three-dimensional numerical calculation model (10) shown in FIG. The two-dimensional numerical calculation model (100) of FIG. 10 is difficult to model the third-order catcher (3) and the fourth-order catcher (4) that form a three-dimensional structure, so that the fourth-order catcher (4 ) Simulating up to the entrance. The two-dimensional numerical calculation model (100) has 5277 contacts and includes 9447 triangular elements. Further, the numerical calculation model (100) shown in FIG. 10 does not include the branch pipe (6). The upstream sound source (S1) is defined in the first stage blower, the downstream sound source (S2) is defined in the second stage blower, and the sound pressure (P = 1) is defined in each sound source (S1, S2). . Also, sound pressure (P = 0) is defined as a boundary condition at the quaternary catcher inlet. The position of the sound source (S1, S2) and other structural dimensions are the same as those of the three-dimensional numerical calculation model (10) shown in FIG.

FIG. 11 shows the difference in calculation results between the two-dimensional numerical calculation model (100) and the three-dimensional numerical calculation model (10). The three-dimensional numerical calculation model (10) shown in FIG. 11 is substantially the same as the numerical calculation model (10) shown in FIG. 4, but can be directly compared with the two-dimensional numerical calculation model (100). Therefore, a point sound source of sound pressure (P = 1) is defined for the sound source (S1, S2) instead of the surface sound pressure.
In the two-dimensional numerical calculation model (100), two sound pressure nodes (k) appear between the pair of sound sources (S1, S2). On the other hand, in the three-dimensional numerical calculation model (10), only one sound pressure node (k) appeared between the pair of sound sources (S1, S2). Moreover, the sound pressure around the constricted portion of the second straight pipe (72), which means the butterfly valve (B), was high in the three-dimensional numerical calculation model (10) and low in the two-dimensional numerical calculation model (100).
From these results, it can be seen that the sound pressure distribution simulated in the numerical calculation model (10, 100) is affected by the quaternary catcher (4) to which the second straight pipe (72) is connected.

FIG. 12 shows the difference in calculation results between the two-dimensional numerical calculation model (100) and the three-dimensional numerical calculation model (10), and is included in the two-dimensional numerical calculation model (100) and the three-dimensional numerical calculation model (10). A branch pipe (6) is included. In both numerical calculation models (10, 100), the branch pipe (6) is located at a position spaced 1750 mm downstream from the upstream sound source (S1). In the simulation of the silencing effect using the two-dimensional numerical calculation model (100) at the position of the branch pipe (6), it has been confirmed that the silencing effect by the branch pipe (6) is the highest.
According to the two-dimensional numerical calculation model (100), the portion of the second straight pipe (72) downstream from the branch pipe (6) has a low sound pressure level as a whole. On the other hand, according to the three-dimensional numerical calculation model (100), a high sound pressure level was confirmed around the second straight pipe (72) simulating the butterfly valve (B).
Therefore, it can be seen that the appropriate branch position of the branch pipe (6) cannot be determined by the two-dimensional numerical calculation model (100) that does not include the quaternary catcher (4).

(Test Example 3: Difference by sound source)
13 and 14 show a sound source having a pattern different from the sound source pattern shown in FIG.
The sound source shown in FIG. 13 is a surface sound source that vibrates at a speed of 1 in the normal direction of the surface and in the reverse normal direction. The sound source shown in FIG. 14 vibrates at a velocity of 1 in the normal direction of the surface and a velocity of -1 in the reverse normal direction, and the upstream sound source (S1) and the downstream sound source (S2) vibrate in opposite phases. It is a sound source.

FIG. 15 is a graph comparing the numerical calculation simulation result using the sound source pattern shown in FIGS. 5, 13, and 14 with the actually measured noise value using the actual suction processing system. The measurement point numbers are shown on the horizontal axis of the graph shown in FIG. The interval between adjacent measurement point numbers is 5 cm, the measurement point numbers 1 to 36 correspond to the second-stage blower suction port from the first-stage blower discharge port, and the measurement point numbers 37 to 61 are the second-stage blower. It corresponds to the inlet of the fourth catcher (4) from the discharge port. In addition, at the positions of the measurement point numbers 19, 20, and 54, measurement is impossible due to a structural problem (existence of pipe joints and valves) of the suction processing apparatus, and it is not shown in the data in FIG.
In FIG. 15, the curve indicated by the symbol L1 is the calculation result using the sound source pattern shown in FIG. In FIG. 15, the curve indicated by the symbol L2 is a calculation result using the sound source pattern shown in FIG. In FIG. 15, the curve indicated by the symbol L3 is the calculation result using the sound source pattern shown in FIG.
In FIG. 15, the degree of fit between the calculation results of the portions surrounded by circles C1, C3, and C4 and the measured data is not significantly different depending on the sound source pattern, and is obtained from the increase / decrease tendency of the values of the measured data and the calculated results. The increasing / decreasing tendency of the sound pressure level is almost the same. In the portion surrounded by the circle C2, it can be seen that the numerical calculation result using the sound source pattern shown in FIG. 5 is most suitable for the tendency of the actually measured data.

(Test Example 4: Comparison with measured values)
FIG. 16 is a schematic diagram of the air discharge mechanism (1) of the suction processing system in which the branch position of the branch pipe (6) is changed based on the simulation result of the silencing effect based on the three-dimensional numerical calculation model (10). In the air discharge mechanism (1) shown in FIG. 16, the elbow pipe (51) is disposed at a position 140 mm away from the discharge port of the blower (2). Moreover, the distance from the base end part of an elbow pipe (51) to the reflecting plate (623) of a branch pipe (6) is set to 570 mm.

  FIG. 17 is a plan view of a vehicle equipped with a suction processing system including the air discharge mechanism (1) in which the position of the branch pipe (6) shown in FIG. 16 is changed, and shows measurement points in this test. In this test, noises emitted from the suction processing system were measured at eight positions 1 m away from the vehicle.

FIG. 18 shows the results of noise measurement using the vehicle shown in FIG.
In FIG. 18, the measurement point numbers indicated on the horizontal axis of the graph coincide with the numbers assigned to the measurement points shown in FIG. In FIG. 18, the curve indicated by L1 indicates the noise level at each measurement point in a state where the branch pipe (6) is not attached. In FIG. 18, the curve indicated by L2 is from the branch point of the branch pipe (6). The noise level at each measurement point measured in a state where the distance to the tip of the branch pipe (6) is 570 mm is shown.
As is apparent from FIG. 18, when the branch pipe (6) is attached, the noise level at all measurement points is reduced, and in particular, the noise level at the measurement point 6 surrounded by the circle C1 in FIG. It is.
Table 2 below shows the results of measuring the noise level at the measurement point 6 by changing the length of the branch pipe (6).

From the data shown in Table 2, when the length of the branch pipe (6) is adjusted and the distance from the base end of the elbow pipe (51) to the reflecting surface of the reflector (623) is 545 mm, the most noise level is obtained. It can be seen that reduction can be achieved.
FIG. 19 shows frequency characteristics when the distance from the base end of the elbow pipe (51) to the reflecting surface of the reflector (623) is 545 mm and frequency characteristics when the branch pipe (6) is removed. In FIG. 19, the curve indicated by reference numeral L1 indicates the frequency characteristics when the branch pipe (6) is removed. In FIG. 19, the curve indicated by reference numeral L2 indicates that the reflector (623) extends from the base end of the elbow pipe (51). ) Shows the frequency characteristics when the distance to the reflecting surface is 545 mm.
As is apparent from the data around the frequency 160 Hz surrounded by the circle C1, it can be seen that the sound pressure level of the sound wave around the frequency 160 Hz is greatly reduced by attaching the branch pipe (6).

  In the above test example, the test for the main pipe line (5) connected to the discharge port of the blower (2) was shown. However, a branch pipe (6) is provided on the suction port side, and the branch pipe (6 The present applicant has confirmed that the position and the length of () can be ascertained and an effective silencing action can be obtained.

(Example of change)
The processing equipment mounting area of a suction processing work vehicle equipped with a suction processing system is strictly limited. Therefore, the device group which comprises a suction processing system is in a dense state, and tends to cause resonance. In order to avoid this resonance phenomenon, an extension pipe having a predetermined length lined with a sound absorbing material such as urethane foam may be connected to the air discharge port of the quaternary catcher (4) to avoid the resonance action. Further, the periphery of other noise sources such as a blower driving belt and a fan for cooling the blower may be covered with a cover with a sound absorbing material. As a result, a blower-equipped vehicle with a reduced noise level can be constructed.

FIG. 20 shows the result of noise measurement after such other noise processing measures are taken.
The measurement point numbers on the horizontal axis of the graph of FIG. 20 coincide with the numbers assigned to the measurement points shown in FIG. In FIG. 20, a curve indicated by a symbol L1 indicates the noise level of a normal suction processing work vehicle that does not take any noise countermeasures. In FIG. 20, a curve indicated by a symbol L2 indicates only a noise suppression measure by the branch pipe (6). The noise level when applied is shown, and the curve indicated by the symbol L3 in FIG. 20 shows the noise level when another noise processing measure is further applied using the sound absorbing material as described above.
According to FIG. 20, it is possible to significantly reduce the noise level from the noise level of a normal suction processing work vehicle by performing other noise processing measures together.

FIG. 21 shows another modification.
The branch pipe (6) shown in FIG. 21 includes an annular gear ring (624) protruding radially from the outer peripheral surface of the end pipe (62). A plurality of gear teeth are formed on the peripheral surface of the gear ring (624). A drive motor (7) is disposed adjacent to the branch pipe (6), and a gear (71) is attached to the tip of the rotary shaft of the drive motor (7). Gear (71) meshes with gear ring (624).
Furthermore, a temperature sensor (29) for measuring the temperature of air sent from the blower (2) discharge port and an encoder (28) for measuring the rotational speed of the blower (2) are attached to the blower (2). The temperature sensor (29) sends a measurement signal corresponding to the temperature of the air sent from the blower (2) discharge port to the control panel (8) attached to the blower-equipped vehicle. The encoder (28) sends a measurement signal corresponding to the rotational speed of the blower (2) to the control panel (8).
Based on the signals from the temperature sensor (29) and the encoder (28), the control panel (8) calculates a quarter length of the sound wave emitted from the blower (2).
A reflective position sensor (241) is attached to the lower surface of the gear ring (624), and the position sensor (241) receives the reflected light from the flange portion (611) of the branch pipe (6) and receives the reflection plate (623). A signal relating to the current position is sent to the control panel (8).
The control panel (8) determines the rotation angle of the rotating shaft of the motor (7) on the basis of the signal from the position sensor (241) and the value of the quarter of the calculated sound wave length. A drive signal corresponding to the rotation angle is sent to the motor (7).
The motor (7) is rotated by a rotation angle corresponding to the drive signal from the control panel (8), and through the rotation of the gear ring (624) connected to the gear (71) of the motor (7), the branch pipe ( The end tube (62) of 6) moves up and down. As a result, the length from the branch pipe (6) branching position to the reflector (623) automatically matches the length of ¼ of the sound wave length emitted from the blower (2).
According to such a modification, even when the sound wave length is changed due to an environmental change such as the outside air temperature, the position of the reflector (623) can be automatically arranged at an appropriate position. Further, the gear ring (624) has an effect of enhancing the heat dissipation effect. As another method for enhancing the heat dissipation effect, it is possible to adopt a form in which one or a plurality of fin plates that protrude in the radial direction from the outer peripheral surface of the end tube (62) and extend in the axial direction of the end tube (62) are attached. it can.

FIG. 22 shows another modification.
In the example shown in FIG. 1, the elbow pipe (51) is formed integrally with the main pipe line (5). However, the main pipe line (5) is cut upstream and downstream of the elbow pipe (51). The connection pipe (510) shown in FIG. The connecting pipe (510) includes an elbow pipe (51) that branches off from the middle of the connecting pipe (510). The connection pipe (510) includes a bellows part (511) on the upstream side and the downstream side with respect to the branch part of the elbow pipe (51). Furthermore, the connecting pipe (510) includes a cylinder (512) having a rod that expands and contracts in the axial direction of the connecting pipe (510). The rod of the cylinder (512) is connected to the middle part of the connecting pipe (510) via the bracket (513).
When the rod of the cylinder (512) expands and contracts, either the upstream side or the downstream side bellows part (511) expands and the other contracts. As a result, the branch position of the elbow pipe (51) can be displaced upstream or downstream.

  Install a sound pressure sensor that detects the noise level on the blower-equipped vehicle. The sound pressure sensor sends a signal related to the sound pressure during the suction operation to the control panel (8). The control panel (8) sends a signal to the valve of the cylinder (512) to expand and contract the rod of the cylinder (512) over the entire range of motion. Based on the fluctuation of the sound pressure sensor signal transmitted during this period, the control panel (8) determines the minimum noise level, and then sends a signal to the cylinder (512) to reach the optimum branch position of the elbow pipe (51). The elbow pipe (51) is displaced.

  In the above description, the blower-equipped vehicle has been described as an example. However, the present invention also includes a stationary suction device in which the suction processing system mounted on the blower-equipped vehicle used in the above description is placed and fixed on the ground. included. Such a stationary suction device can provide a very low noise work environment, like the blower-equipped vehicle of the present invention described above.

  As is apparent from the above description, the applicant has conducted a number of numerical model tests as well as demonstration tests in order to construct the silencer mechanism of the present invention. It was confirmed that the actual sound wave length substantially coincided with the theoretical value related to the sound wave length calculated using the number of rotor leaves of the blower, the number of rotations based on the specification standard, or the actually measured number of rotations. Therefore, in the above description, a branch pipe whose axial length dimension can be changed has been used. However, the present invention includes a silencing mechanism using a branch pipe having a constant axial length dimension in its technical scope.

  In the above description, a two-stage integrated blower has been mainly used as an embodiment. However, the present invention has a configuration in which the first-stage blower and the second-stage blower are arranged separately, and the first-stage blower is a single-stage blower. The present invention can also be applied to a configuration in which the body is arranged, and the applicant of the present invention has also tested various blower piping configurations in the same manner as described above to confirm the effectiveness of the present invention. In a number of tests and simulations by the applicant, a numerical calculation model was created by defining a sound source at the suction port and discharge port that can be a sound wave discharge port, regardless of the type of blower, and based on this, an anti-node position of the sound wave was created. It is confirmed that effective silencing can be obtained for an actual blower-equipped vehicle or a stationary suction device.

FIG. 23 shows an example of a numerical calculation model for various types of blowers. FIG. 26A is a schematic view around the blower (2) of the numerical calculation model (10) when the single-stage blower (2) is integrally arranged in the pipe, and FIG. A numerical calculation model (10) when two bodies of the formula blower (2) are connected in a pipe is shown.
As shown in FIG. 23A, when the single-stage blower (2) is integrally arranged in the pipe, the sound sources (S21, S22) can be defined as the suction port and the discharge port of the blower (2), respectively.
As shown in FIG. 23 (b), when two single-stage blowers (2) are connected in the pipe, one sound source (S23) is connected to the suction port of the first-stage blower (2A) arranged on the upstream side. ) And another sound source (S24) can be defined at the discharge port of the second stage blower (2B). Alternatively, one sound source (S25) is defined in the middle of the pipe connecting the first-stage blower (2A) and the second-stage blower (2B), and the second-stage blower (2B) Another sound source (S24) can be defined at the discharge port. Furthermore, a numerical calculation model may be created by combining sound sources (S23, S25, S24).
The invention has been demonstrated to be applicable to a wide variety of piping structures. Although it is considered that the most appropriate sound source setting exists in the numerical calculation model for various piping structures, even if the sound source setting in the numerical calculation model is not the most appropriate, it is related to FIG. As explained, the actual measurement values and the simulation results based on the numerical calculation model are compatible in many parts. Therefore, in the present invention, as long as the processing device connected to the blower is included in the numerical calculation model, high accuracy is not required for the setting of the sound source, and the user expresses the state of the sound source best. By setting the sound source assuming the sound source to be considered, it is possible to simulate the actual noise model and determine the branch pipe arrangement position for maximizing the silencing effect.

FIG. 24 is a schematic view showing a piping configuration of a suction processing device mounted on a blower-equipped vehicle equipped with a silencing mechanism using a branch pipe (6). As shown in FIGS. 8 and 17, a group of processing equipment used for suction processing is arranged and fixed on the loading platform frame of the blower-equipped vehicle. FIG. 24 shows the arrangement and connection of these groups of devices.
The blower-equipped vehicle includes, for example, a suction pipe (91) that sucks dust on the road. At the tip of the suction pipe (91), negative pressure generated from the blower (2) that is mounted on the blower-equipped vehicle and disposed downstream of the suction pipe (91) is transmitted, and the dust on the road is a series of the blower-equipped vehicle. It is introduced in the processing equipment group. The suction pipe (91) is a flexible pipe, and the length dimension is appropriately determined according to the intended use. The proximal end portion of the suction pipe (91) is connected to the suction port of the auxiliary storage tank (92) arranged on the downstream side of the suction pipe (91).

For the preliminary storage tank (92), a cyclone mechanism or the like by gravity settling can be employed. By arranging the preliminary storage tank (92), relatively large particles or heavy particles in the processing fluid introduced into the processing equipment group of the blower-equipped vehicle are collected in the preliminary storage tank (92).
A wet dust collecting tank (3A) as a tertiary catcher (3) is disposed downstream of the preliminary storage tank (92). The wet dust collection tank (3A) and the auxiliary storage tank (92) are connected by a communication pipe (93). One end of the communication pipe (93) is connected to the discharge port of the preliminary storage tank (92), and the other end of the communication pipe (93) is inserted into the wet dust collection tank (3A). The wet dust collection tank (3A) stores a predetermined amount of water, and the other end of the communication pipe (93) is located in the water in the wet dust collection tank (3A). Further, in the air layer above the internal space of the wet dust collection tank (3A), the peripheral wall of the communication pipe (93) is provided with an opening so that the negative pressure from the blower (2) can be transmitted to the suction pipe (91). The
The air introduced from the suction pipe (91) flows into the wet dust collection tank (3A) and is released in the water in the wet dust collection tank (3A). Noise components due to the flow of air from the suction pipe (91) are attenuated by the release in water. In addition, dust components in the air introduced from the suction pipe (91) are captured by the water in the wet dust collection tank (3A).

A water layer is formed in the lower part of the internal space of the wet dust collection tank (3A) as described above, and an air layer is formed in the upper part. The air introduced into the water layer in the wet dust collection tank (3A) from the suction pipe (91) through the communication pipe (93) and removed from the dust component is then moved upward by the buoyancy. To the air layer above the internal space of the wet dust collection tank (3A).
An opening is formed in the upper part of the wet dust collection tank (3A) housing. This opening is connected to the suction port of the blower (2) via the connecting pipe (94). The air in the wet dust collecting tank (3A) is sucked by the blower (2) and reaches the main pipe line (5) connected to the blower (2) discharge port through the blower (2).
As described above, the main pipe line (5) connects the blower (2) and the quaternary catcher (4). In the example shown in FIG. 24, the quaternary catcher (4) is a mist catcher / water tank (4A). An opening is formed in the upper part of the mist catcher / water tank (4A) casing, and the downstream end of the main pipe (5) is connected to the opening in the upper part of the mist catcher / water tank (4A) casing.
A predetermined amount of water is stored in the mist catcher / water tank (4A), and this water forms a water layer in the lower part of the internal space in the mist catcher / water tank (4A). Furthermore, an air layer is formed in the upper part of the internal space of the mist catcher / water tank (4A). The air sent from the main pipe (5) into the mist catcher / water tank (4A) is discharged to the air layer above the inner space of the mist catcher / water tank (4A).
A discharge port (41) is formed in the upper part of the mist catcher / water tank (4A) housing, and the air released to the air layer in the upper space of the mist catcher / water tank (4A) is discharged from the discharge port (41) to the external environment. To be released. The water layer in the mist catcher / water tank (4A) cools the air released into the air layer and captures the water vapor component contained in the released air. Thereby, before air is discharged | emitted by the external environment, the temperature and humidity of air can be made into the state suitable for discharge | release.

  A cooling water conduit (42) extends from the lower part of the mist catcher / water tank (4A). The cooling water conduit (42) bends in the middle and extends upward. In FIG. 24, a flow meter (421) is attached to the middle part of the pipe line extending upward. The flow meter (421) detects the presence or flow rate of the cooling water flowing through the cooling water conduit (42). The cooling water conduit (42) extends upward from the flow meter (421) and then bends in an inverted U shape that opens downward, and in the vicinity of the blower (2) suction port, the connecting pipe (94) Connect with. On the upstream side (suction port side) of the blower (2), negative pressure is generated by the operation of the blower (2). Due to this negative pressure, the water contained in the mist catcher / water tank (4A) is drawn into the cooling water conduit (42), and the connecting pipe is connected to the cooling water conduit (42) and the connecting pipe (94). (94). The water discharged into the connecting pipe (94) is supplied into the blower (2) by the negative pressure upstream of the blower (2), and the temperature of the blower (2) is reduced.

FIG. 25 shows an inverted U-shaped curved portion of the cooling water conduit (42).
As apparent from FIGS. 24 and 25, an inverted U-shaped curved portion of the cooling water conduit (42) is formed by combining appropriate pipes such as an elbow pipe and a straight pipe line. In the example shown in FIG. 25, two elbow pipes are arranged downstream of a straight pipe line extending upward from the flow meter (421) to form an inverted U-shaped curved pipe line. A siphon prevention hole (21) is formed in the elbow pipe arranged on the downstream side.
Due to the suction action of the blower (2), air enters the cooling water conduit (42) from the siphon prevention hole (21). As a result, air occupies a part of the internal volume of the cooling water conduit (42), and an excessive amount of cooling water is prevented from being supplied to the blower (2). As a result, an appropriate amount of cooling water is supplied to the blower (2), and a high torque abnormal operation state of the blower (2) due to excessive supply of cooling water is avoided.
During abnormal operation of the blower (2) due to excessive supply of cooling water from the cooling water conduit (42), the frequency characteristics of noise generated from the blower (2) vary greatly. Therefore, prevention of excessive supply of cooling water is very important for noise reduction using the branch pipe (6).

The cooling water conduit (42) has a shape that rises greatly immediately before the connection with the connection pipe (94), so that the connection point between the cooling water conduit (42) and the connection pipe (94) The mist catcher and water tank (4A) does not have any particular restriction on the positional relationship with the water surface of the water. However, when the cooling water guide pipe (42) cannot be raised greatly upward, with respect to the water level in the mist catcher / water tank (4A) which is the maximum in the design of the mist catcher / water tank (4A), It is preferable to arrange a connection point between the cooling water conduit (42) and the connection pipe (94) above 100 mm.
Further, as shown in FIG. 24, the connecting pipe (94) extends from the upper part of the wet dust collecting tank (3A) and then extends downward before connecting the blower (2). The connection point between the cooling water conduit (42) and the connection pipe (94) is preferably located 150 mm or more below from the point where the cooling water conduit (42) starts to extend downward. Thereby, it is possible to prevent the cooling water flowing from the cooling water conduit (42) from going to the wet dust collecting tank (3A), and to efficiently cool the blower (2).

Reference is again made to FIG.
As shown in FIG. 24, the cooling water adjusted to an appropriate amount by the siphon prevention hole (21) receives the suction action of the blower (2), reaches the blower (2), and cools the blower (2). . As a result, the temperature of the blower (2) remains within the operating temperature range determined for the blower (2). The cooling water after cooling the blower (2) is discharged from the discharge port of the blower (2).
The main pipe (5) is connected to the discharge port of the blower (2). The main pipeline (5) is inclined downward from the blower (2) toward a predetermined section. The branch pipe (6) branches from the main pipe line (5) within the inclined section and extends upward with respect to the main pipe line (5). The cooling water is adjusted to an appropriate amount by the siphon prevention hole (21), and is smoothly sent downstream by the flow of air discharged from the blower (2) and the gravitational action in the inclined section. It is done. As a result, the cooling water flows without staying in the main pipe (5), and does not reduce the silencing effect by the branch pipe (6).
As shown in FIG. 24, a cooling water reservoir (53) is formed at the downstream end of the inclined section of the main pipeline (5). The cooling water reservoir (53) forms a space extending radially in the main pipe (5). The cooling water reservoir (53) is not necessarily essential, but contributes to efficient recovery of the cooling water when the discharge amount of the blower (2) is large. When the cooling water recovery of the blower (2) is not efficient, as described above, the silencing effect by the branch pipe (6) is reduced by the cooling water remaining in the piping.

In the description related to FIG. 24 and FIG. 25, it has been described that the preliminary tensioning (92) is mounted and fixed on one vehicle. However, the preliminary storage tank (92) is mounted on another vehicle and a blower-equipped vehicle is used during work. You may make it connect with the upper processing apparatus group. Alternatively, the auxiliary storage tank (92) may be mounted and fixed on the ground.
In addition, the processing equipment group shown in FIGS. 24 and 25 can be used as a stationary suction processing apparatus. In this case, the preliminary storage tank (92), the tertiary catcher (3), the blower (2), and the quaternary catcher (4) are placed and fixed on the ground. In addition, even when used as a stationary suction processing apparatus, water stored in the quaternary catcher (4) is supplied to a pipe line connecting the tertiary catcher (3) and the blower (2). It is preferable to arrange a cooling water conduit (42), and it is more preferable to form a siphon prevention hole (21) on the cooling water conduit (42).

  The present invention is suitably applied to suction work such as gutter cleaning performed in a city.

It is the schematic of the air discharge mechanism which the suction processing system which concerns on this invention has. It is a figure which shows the structure of the branch pipe with which the suction processing system which concerns on this invention is provided. It is a flowchart of the method of determining the branch pipe branch position which concerns on this invention. It is a figure which shows an example of the three-dimensional numerical calculation model used for the method of determining the branch pipe branch position which concerns on this invention. It is a figure explaining the sound source pattern used for the three-dimensional numerical calculation model used for the method of determining the branch pipe branch position which concerns on this invention. It is a graph which shows an example of the result of the numerical calculation using the three-dimensional numerical calculation model used for the method of determining the branch pipe branch position which concerns on this invention. It is a figure explaining the execution step of numerical calculation using the three-dimensional numerical calculation model used for the method of determining a branch pipe branch position concerning the present invention. It is a figure explaining a noise level measurement test. It is a graph which shows the result of the measurement test shown in FIG. It is a figure which shows an example of a two-dimensional numerical calculation model. It is a figure explaining the difference of the result from a three-dimensional numerical calculation model and a two-dimensional numerical calculation model. It is a figure explaining the difference of the result from a three-dimensional numerical calculation model and a two-dimensional numerical calculation model. It is a figure explaining the sound source pattern different from the sound source pattern shown in FIG. It is a figure explaining the sound source pattern different from the sound source pattern shown in FIG. It is a graph explaining the difference of the numerical calculation result between different sound source patterns. It is the schematic of the air discharge mechanism constructed | assembled based on the numerical calculation result. It is a figure explaining a noise level measurement test. It is a graph explaining the silencing effect of the air discharge mechanism shown in FIG. It is a graph explaining the silencing effect of the air discharge mechanism shown in FIG. It is a graph explaining the silencing effect when other silencing measures are further taken. It is a figure which shows an example of the modification of this invention. It is a figure which shows an example of the modification of this invention. It is a figure which shows the example of application of this invention with respect to various piping forms. It is a piping lineblock diagram of the processing equipment group carried in the blower loading car of the present invention. The reverse U-shaped pipe part of the cooling water conduit pipe with which the blower mounting vehicle shown in FIG. 24 is provided is shown. It is the schematic of the suction processing system mounted in the conventional blower mounting vehicle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Air discharge mechanism 2 ... Blower 3 ... Tertiary catcher 4 ... Quaternary catcher 5 ... Main pipeline 6 ... Branch pipe 61... Base tube 62... End tube 623.

Claims (16)

A vehicle with a carrier frame;
A blower body fixed on the carrier frame;
A wet dust collection tank fixed on the cargo bed frame and connected to the suction port of the blower body;
A suction pipe connected to the internal space of the wet dust collecting tank;
It consists of a mist catcher and water tank that is fixed on the carrier frame and connected to the outlet of the blower body,
The main pipe line connecting the blower body discharge port and the mist catcher / water tank is provided with a branch portion in the middle thereof,
With the branch portion as the base end, the branch pipe extends upward,
The tip of the branch pipe is blocked by a reflector that reflects sound waves generated from the blower body,
A blower-equipped vehicle, wherein a distance from the branch portion to the reflecting surface of the reflecting plate is ¼ of the wavelength of the sound wave. A cooling water conduit that extends from the lower part of the mist catcher and water tank and communicates with a connection pipe that connects the wet dust collecting tank and the blower main body suction port,
The main pipeline includes an inclined pipeline section that is inclined downward immediately after the connection with the blower body,
The blower-equipped vehicle according to claim 1, wherein the branch portion is formed in the inclined pipeline portion.   The blower-equipped vehicle according to claim 2, wherein an opening is formed in the cooling water guide pipe peripheral wall.   The blower-equipped vehicle according to claim 2 or 3, wherein a flow meter is disposed in the middle of the cooling water conduit.   The blower-equipped vehicle according to any one of claims 2 to 4, wherein the cooling water guide pipe forms an inverted U-shaped path curved upward, and is then connected to the connection pipe. A blower body mounted on the vehicle;
A processing device mounted on the vehicle and performing a predetermined process;
A main pipe line having one end connected to the blower body and the other end connected to the processing apparatus;
Comprising a branch pipe connected to a branch portion provided in the middle of the main pipeline;
The tip of the branch pipe is blocked by a reflector that reflects sound waves generated from the blower body,
A blower-equipped vehicle, wherein a distance from the branch portion to the reflecting surface of the reflecting plate is ¼ of the wavelength of the sound wave. The branch pipe is composed of a base end pipe located on the main pipe line side and a terminal pipe threadably connected to the base end pipe,
The blower-equipped vehicle according to claim 6, wherein the axial length of the branch pipe is changed by the rotation of the end pipe. Creating a numerical calculation model relating to a system in which the branch pipe is disposed, the blower body, the processing device, and the main pipe line;
Creating a plurality of other numerical calculation models related to the system consisting of the blower body, the processing device, the main pipe and the branch pipe;
In the one numerical calculation model, performing the numerical calculation using the blower body as a sound source to calculate a sound pressure level;
In each of the other numerical calculation models, using the blower body as a sound source, performing numerical calculation and calculating a sound pressure level;
Calculating a difference between sound pressure levels calculated from the one numerical calculation model and the other numerical calculation model;
Determined through a step of comparing the difference value of the sound pressure level,
The position of the branch portion is different between each of the other numerical calculation models,
The step of comparing the difference values of the sound pressure levels includes a step of selecting a numerical calculation model that maximizes the absolute value of the difference values from the plurality of other numerical calculation models. A blower-equipped vehicle according to 6 or 7.   The blower-equipped vehicle according to claim 8, wherein the sound source is a surface sound source. The blower body is a two-stage integrated blower body or a blower body in which the first blower and the second blower are connected,
The surface sound source is defined in the first stage and the second stage of the blower body or the first blower and the second blower,
The blower-equipped vehicle according to claim 9, wherein the pair of surface sound sources vibrate in the same phase.   The blower-equipped vehicle according to any one of claims 8 to 10, wherein the calculation using the numerical calculation model is a three-dimensional boundary element analysis. The processing apparatus comprises an extension tube;
The blower-equipped vehicle according to any one of claims 6 to 11, wherein the extension pipe prevents a sound wave from the blower body and a resonance phenomenon of the processing device. A blower body for sucking and discharging fluid;
A processing device for performing predetermined processing;
A main pipe line having one end connected to the blower body and the other end connected to the processing apparatus;
Comprising a branch pipe connected to a branch portion provided in the middle of the main pipeline;
The tip of the branch pipe is blocked by a reflector that reflects sound waves generated from the blower body,
The distance from the branching portion to the reflecting surface of the reflector is a quarter of the wavelength of the sound wave,
The branch pipe is composed of a base end pipe located on the main pipe line side and a terminal pipe threadably connected to the base end pipe,
Due to the rotation of the end tube, the axial length of the branch tube changes,
Creating a numerical calculation model relating to a system in which the branch pipe is disposed, the blower body, the processing device, and the main pipe line;
Creating a plurality of other numerical calculation models related to the system consisting of the blower body, the processing device, the main pipe and the branch pipe;
In the one numerical calculation model, performing the numerical calculation using the blower body as a sound source to calculate a sound pressure level;
In each of the other numerical calculation models, using the blower body as a sound source, performing numerical calculation and calculating a sound pressure level;
Calculating a difference between sound pressure levels calculated from the one numerical calculation model and the other numerical calculation model;
Determined through a step of comparing the difference value of the sound pressure level,
The position of the branch portion is different between each of the other numerical calculation models,
The step of comparing the difference value of the sound pressure level includes a step of selecting a numerical calculation model that maximizes the absolute value of the difference value from the plurality of other numerical calculation models. Suction device. A blower body mounted on the vehicle;
A processing device mounted on the vehicle and performing a predetermined process;
A main pipe line having one end connected to the blower body and the other end connected to the processing apparatus;
Consisting of a branch pipe connected to the main pipeline,
The main pipe line includes a first pipe connected to the blower body, a second pipe connected to the processing apparatus, and a connection pipe connecting the first pipe and the second pipe,
The connection pipe includes a branch portion,
The branch pipe includes a base end pipe positioned on the branch end side, a terminal pipe threadably connected to the base end pipe, a reflecting plate that closes the tip between the end ends and reflects sound waves generated from the blower body. With
The distance from the branching portion to the reflecting surface of the reflector is equal to ¼ of the wavelength of the sound wave,
The blower-equipped vehicle characterized in that the connection pipe includes bellows pipe portions on the upstream side and the downstream side with respect to the base end pipe, and the branch position of the base end pipe from the main pipeline can be displaced. Among the connection pipes, further comprising a cylinder connected to the middle part between a pair of bellows pipe parts of the connection pipe,
The blower-equipped vehicle according to claim 14, wherein the branch position of the base end pipe is displaced by expansion and contraction of the rod of the cylinder. A blower body mounted on the vehicle;
A processing device mounted on the vehicle and performing a predetermined process;
A main pipe line having one end connected to the blower body and the other end connected to the processing apparatus;
Comprising a branch pipe connected to a branch portion provided in the middle of the main pipeline;
The tip of the branch pipe is blocked by a reflector that reflects sound waves generated from the blower body,
A blower-equipped vehicle, wherein a distance from the branch portion to the reflecting surface of the reflecting plate is determined by the number of rotor leaves and a standard rotational speed of the blower body.

Images