JP2014040748A - Road sweeper - Google Patents

Abstract

The present invention provides a road cleaning vehicle capable of injecting liquid in which bubbles are generated onto a road surface without using a high-output pump.
An injection main body portion of an injection unit of a road surface cleaning vehicle is a liquid supply passage through which liquid is supplied toward an injection port located at an end on the liquid supply direction side, and has a cross-sectional area perpendicular to the passage axis. By supplying air toward the cross-sectional area reducing portion of the liquid-feeding passage, and a liquid-feeding passage having a cross-sectional area reducing portion that is partially smaller than the other parts of the liquid-feeding passage, An air supply passage for generating the bubbles in the liquid. The said injection unit is provided with the air introduction part which introduces the said air into the said air supply path from the exterior of a casing.
[Selection] Figure 5

Description

  The present invention relates to a road surface cleaning vehicle that injects liquid onto a road surface by an injection unit to lift the clogged material that has entered a gap in the road surface and sucks the clogged material that has been lifted by a suction unit.

  Patent Document 1 discloses a road cleaning vehicle that sucks clogged materials such as earth and sand and dust that have entered a gap between road surfaces from a suction port by a suction unit. The road cleaning vehicle is provided with an injection unit that injects liquid from the injection port toward the road surface. The injection unit includes an injection main body portion in which a liquid supply passage is formed along a passage axis. An injection port is located at the end of the liquid supply passage on the liquid supply direction side. In addition, the liquid feed passage is provided with a cross-sectional area reduction portion in which the cross-sectional area perpendicular to the passage axis is partially smaller than the other parts of the liquid feed passage.

  In this road cleaning vehicle, the liquid that has been made high pressure by a high-power pump or the like is introduced into the liquid supply passage. When the high-pressure liquid is introduced into the liquid feeding passage, the flow velocity of the liquid rapidly increases at the cross-sectional area decreasing portion, and the liquid pressure is rapidly decreased at the cross-sectional area decreasing portion. Thereby, bubbles are generated in the liquid at the cross-sectional area decreasing portion. Then, the liquid in which bubbles are generated is ejected from the ejection port onto the road surface. Bubbles contained in the liquid collapse on or near the road surface. The clogged material that has entered the gaps on the road surface is lifted by the energy of micro jets, shock waves, etc. generated when the bubbles collapse. Then, the clogged material that floats is sucked by the suction unit.

JP 2003-74032 A

  In the road cleaning vehicle of Patent Document 1, it is necessary to introduce a high-pressure liquid into the liquid feeding passage in order to generate bubbles in the liquid at the cross-sectional area reducing portion. In order to produce the high-pressure liquid, a high-power pump is required, and the high-power pump is large and heavy. By providing a high-output pump, the road cleaning vehicle is also increased in size and weight. In addition, by providing a high-power pump that is large and heavy, the load of suctioned clogged items is reduced in the road sweeper. Furthermore, by providing a high-output pump, noise from the pump also increases.

  The present invention has been made paying attention to the above-mentioned problems, and an object of the present invention is to provide a road cleaning vehicle capable of injecting a liquid in which bubbles are generated on a road surface without using a high-output pump. is there.

  In order to achieve the above object, a road cleaning vehicle according to an aspect of the present invention performs suction through a suction passage from a casing in which an opening that opens toward the road surface is formed, and a suction port located inside the casing. A suction unit; and an injection body that is provided inside the casing, and includes an injection unit that injects a liquid in which bubbles are generated from an injection port located inside the casing toward the road surface, The injection main body portion of the injection unit is a liquid supply passage that extends along the passage axis, and that feeds the liquid toward the injection port located at the end on the liquid supply direction side. A liquid-feeding passage having a cross-sectional area reducing portion whose cross-sectional area perpendicular to the other part of the liquid-feeding passage is partially smaller than that of the liquid-feeding passage; Aisle An air supply passage for generating air bubbles in the liquid by supplying air toward the cross-sectional area reducing portion, and the ejection unit introduces the liquid into the liquid supply passage. And an air introduction part for introducing the air into the air supply passage from the outside of the casing.

  ADVANTAGE OF THE INVENTION According to this invention, the road cleaning vehicle which can inject the liquid which the bubble generate | occur | produced on the road surface can be provided, without using a high output pump.

1 is a schematic view showing the configuration of a road sweeper according to a first embodiment of the present invention. Schematic which shows the structure of the injection unit which concerns on 1st Embodiment. Sectional drawing which shows schematically the internal structure of one certain casing which concerns on 1st Embodiment. The schematic diagram which looked at Drawing 3 from the direction of arrow U1. Sectional drawing which shows schematically the structure of one injection main-body part provided in the inside of the casing which concerns on 1st Embodiment. Sectional drawing which shows schematically the internal structure of one casing which concerns on 2nd Embodiment. FIG. 7 is a schematic view of FIG. 6 viewed from the direction of arrow U2. The perspective view which shows schematically the structure of the drive ring provided in the inside of a certain casing which concerns on 2nd Embodiment. Sectional drawing which shows schematically the structure of one injection main body part and one diffusion cylinder part provided in the inside of the casing which concerns on 2nd Embodiment in the state in which a diffusion cylinder part is located in a non-diffusion position. . FIG. 10 is a schematic view of FIG. 9 viewed from the direction of arrow S1. Sectional drawing which shows schematically the structure of a certain injection main body part provided in the inside of the casing which concerns on 2nd Embodiment, and a certain one diffusion cylinder part in the state in which a diffusion cylinder part is located in a diffusion position. FIG. 11 is a schematic view of FIG. 11 viewed from the direction of arrow S2. The perspective view which shows roughly the structure of a certain injection main body part provided in the inside of the casing which concerns on 3rd Embodiment, and a certain one diffusion cylinder part. Sectional drawing which shows schematically the structure of a certain injection main body part provided in the inside of the casing which concerns on 3rd Embodiment, and a certain one diffusion cylinder part.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram illustrating a configuration of a road cleaning vehicle 1 according to the present embodiment. As shown in FIG. 1, the road cleaning vehicle 1 includes a vehicle body 2 and wheels 3 attached to the vehicle body 2. A driver's cab 5 is provided at the front side of the vehicle body 2. An exterior cover (a hopper and engine room cover) 6 is provided on the rear side of the cab 5. The exterior cover 6 is attached to the vehicle body 2.

  Further, casings 10 </ b> A and 10 </ b> B are attached to the vehicle body 2. The casings 10 </ b> A and 10 </ b> B are positioned vertically downward from the vehicle body 2. The casing 10A is located at the left side portion, and the casing 10B is located at the right side portion. Openings 11A and 11B that open toward the road surface are formed in the respective casings 10A and 10B.

  The road surface cleaning vehicle 1 is provided with a suction unit 15 that sucks clogged materials such as earth and sand and dust that have entered the gaps on the road surface. The suction unit 15 includes suction hoses 16A and 16B attached to the vehicle body 2. Suction passages 17A and 17B are extended inside the suction hoses 16A and 16B, respectively. Suction ports 19A and 19B are formed at one ends of the suction passages 17A and 17B. The suction port 19A is located inside the casing 10A, and the suction port 19B is located inside the casing 10B.

  A hopper 21 is provided inside the exterior cover 6. The hopper 21 is located at the rear side of the road cleaning vehicle 1. The hopper 21 includes a first cavity portion 22 and a second cavity portion 23 located on the vertically upper side of the first cavity portion 22. The other ends (the ends opposite to the suction ports 19A and 19B) of the suction passages 17A and 17B communicate with the first cavity portion 22 of the hopper 21.

  Further, the hopper 21 is provided with a water tank (liquid tank) 25 and a sewage tank (dirt tank) 26. The water tank 25 and the sewage tank 26 are located on the vertically lower side of the first cavity portion 22. The inside of the sewage tank 26 communicates with the first cavity 22. The interior of the water tank 25 does not communicate with the interior of the first cavity 22 and the sewage tank 26. The first cavity portion 22 communicates with the second cavity portion 23. A screen 28 is provided between the first cavity portion 22 and the second cavity portion 23.

  An engine room 31 is provided inside the exterior cover 6. The engine room 31 is located on the front side of the hopper 21. The engine room 31 includes a third cavity portion 32 and a fourth cavity portion 33 located on the vertically lower side of the third cavity portion 32. The third cavity 32 of the engine room 31 communicates with the second cavity 23 of the hopper 21 via the blower 30. Air is sent from the second cavity 23 of the hopper 21 to the third cavity 32 of the engine room 31 by the blower 30. The exterior cover 6 is provided with an exhaust port 35 that allows communication between the third cavity 32 of the engine room 31 and the outside of the exterior cover 6.

  An engine 36 is provided in the fourth cavity 33 of the engine room 31. The fourth cavity 33 is provided with a hydraulic oil tank 37 and a hydraulic pump 38 that supplies oil from the hydraulic oil tank 37 to the blower 30 by being driven by the engine 36. By supplying oil to the blower 30, the blower 30 is operated. An air compressor 41 is provided in the fourth cavity portion 33. An air tank 42 is built in the vehicle body 2.

  The road surface cleaning vehicle 1 includes an injection unit 40 that injects water that is liquid toward the road surface. FIG. 2 is a diagram illustrating the configuration of the injection unit 40. As shown in FIG. 2, the injection unit 40 includes the water tank 25, the air compressor 41, and the air tank 42 described above. A drain cock 45 and a pressure gauge 46 are attached to the water tank 25. A drain cock 48 is attached to the air tank 42. The injection unit 40 includes an air relief valve 51. The water tank 25 and the air relief valve 51 are connected via an air communication path 49.

  The injection unit 40 includes an air introduction part 50 and a relief valve 52. The air introduction unit 50 includes an air relay passage 53, a main air supply passage 55, and sub air supply passages 57A to 57C. The air tank 42 is connected to the air compressor 41 and the relief valve 52 via the air relay passage 53. A check valve 58 is provided in the air relay passage 53. In the air relay passage 53, the air in the air tank 42 is compressed by the air compressor 41.

  The water tank 25 is connected to the air relay passage 53 via the main air supply passage 55. Compressed air can be supplied to the water tank 25 through the main air supply passage 55. The main air supply passage 55 is provided with a cock 61 and a check valve 62. The amount of compressed air flowing out from the air relay passage 53 to the main air supply passage 55 is adjusted by the cock 61. For this reason, the supply amount of the compressed air to the water tank 25 is adjusted by the cock 61.

  The injection unit 40 includes a plurality of injection main body portions 65A1 to 65A6, 65B1 to 65B6, 65C1 to 65C6. The injection main body portions 65A1 to 65A6 are connected to the main air supply passage 55 via the sub air supply passage 57A. A cock 66A is provided in the sub air supply passage 57A. The amount of air outflow from the main air supply passage 55 to the sub air supply passage 57A is adjusted by the cock 66A. Therefore, the supply amount of air (compressed air) to the injection main body portions 65A1 to 65A6 is adjusted by the cock 61 and the cock 66A.

  Similarly, the injection main body portions 65B1 to 65B6 are connected to the main air supply passage 55 via the sub air supply passage 57B, and the injection main body portions 65C1 to 65C6 are connected to the main air supply passage 55 via the sub air supply passage 57C. ing. A cock 66B is provided in the sub air supply passage 57B, and a cock 66C is provided in the sub air supply passage 57C. Instead of the cocks 61 and 66A to 66C, an electromagnetic valve capable of adjusting the flow rate of the passing air may be provided.

  The ejection unit 40 includes a liquid introduction unit 70. The liquid introduction unit 70 includes a main liquid supply passage 71 and sub liquid supply passages 72A to 72C. One end of the main liquid supply passage 71 is connected to the water tank 25. By supplying compressed air to the water tank 25 via the main air supply passage 55, water can flow out from the water tank 25 to the main liquid supply passage 71. The main liquid supply passage 71 is provided with a filter 73 and a cock 75. The water flowing out from the water tank 25 is purified by the filter 73. Further, the amount of water outflow from the water tank 25 to the main liquid supply passage 71 is adjusted by the cock 75.

  The ejection main body portions 65A1 to 65A6 are connected to the main liquid supply passage 71 via the sub liquid supply passage 72A. A cock 76A is provided in the sub liquid supply passage 72A. The outflow amount of water from the main liquid supply passage 71 to the sub liquid supply passage 72A is adjusted by the cock 76A. Therefore, the supply amount of water (liquid) to the injection main body portions 65A1 to 65A6 is adjusted by the cock 75 and the cock 76A.

  Similarly, the ejection body portions 65B1 to 65B6 are connected to the main liquid supply passage 71 via the sub liquid supply passage 72B, and the ejection body portions 65C1 to 65C6 are connected to the main liquid supply passage 71 via the sub liquid supply passage 72C. ing. A cock 76B is provided in the sub liquid supply passage 72B, and a cock 76C is provided in the sub liquid supply passage 72C. In addition, you may provide the solenoid valve which can adjust the flow volume of the water to pass instead of cock 75,76A-76C.

  FIG. 3 is a diagram showing an internal configuration of one casing 10A (10B). FIG. 4 is a view of FIG. 3 viewed from the direction of the arrow U1. As shown in FIGS. 3 and 4, in the suction unit 15, the suction port 19A of the suction passage 17A is located inside the casing 10A, and the suction port 19B of the suction passage 17B is located inside the casing 10B. The suction passage 17A extends along the suction axis VA, and the suction passage 17B extends along the suction axis VB.

  The injection main body portions 65A1 to 65A6 are provided inside the casing 10A. And the sub air supply passage 57A of the air introduction part 50 and the sub liquid supply passage 72A of the liquid introduction part 70 are connected to the injection main body parts 65A1 to 65A6. The injection main body portions 65A1 to 65A6 are arranged concentrically around the suction axis VA of the suction passage 17A. The suction port 19A of the suction passage 17A is surrounded by the injection main body portions 65A1 to 65A6. Similarly, the injection main body portions 65B1 to 65B6 are provided inside the casing 10B and are arranged concentrically around the suction axis VB of the suction passage 17B. The suction port 19B of the suction passage 17B is surrounded by the injection main body portions 65B1 to 65B6.

  In addition, the injection main body portions 65C1 to 65C6 are provided at a position on the vertically lower side of the vehicle body 2 and on the front direction side of the road sweeper (see FIG. 1). Here, the casing which accommodates the injection main body portions 65C1 to 65C6 is not provided. Further, since no suction port is provided in the vicinity of the ejection main body portions 65C1 to 65C6, the clogging material is not sucked in the vicinity of the ejection main body portions 65C1 to 65C6.

  FIG. 5 is a diagram showing a configuration of one injection main body 65A1 provided inside the casing 10A. In the following description, only the injection main body portion 65A1 will be described. However, in the injection main body portions 65A2 to 65A6, 65B1 to 65B6, 65C1 to 65C6, water (liquid) is directed toward the road surface in the same manner as the injection main body portion 65A1. ) Is injected.

  As shown in FIG. 5, the injection main body portion 65 </ b> A <b> 1 includes a liquid feeding passage 81 that extends along the passage axis P. The passage axis P is substantially coaxial with the central axis of the injection main body 65A1 and is parallel to the vertical direction. An injection port 82 is provided at one end (vertical lower end) of the liquid supply passage 81. The injection port 82 is located inside the casing 10A. The other end (vertically upward end) of the liquid supply passage 81 communicates with the sub liquid supply passage 72A of the liquid introduction unit 70. Water (liquid) is introduced into the liquid supply passage 81 through the sub liquid supply passage 72A. Then, water is fed in the liquid feed passage 81 toward the injection port 82. Therefore, in the ejection main body 65A1, the vertically downward direction is the liquid feeding direction, and the ejection port 82 is located at the end of the liquid feeding passage 81 on the liquid feeding direction side.

  Further, the liquid feeding passage 81 is provided with a cross-sectional area reducing portion 83. In the cross-sectional area reducing portion 83, the cross-sectional area perpendicular to the passage axis P is partially smaller than that in other portions of the liquid feeding passage 81. For this reason, in the cross-sectional area reduction part 83, the flow rate of the water to be sent is increased by the same principle as the Venturi effect, and the pressure of the water is higher than that of the other part of the liquid introduction part 70 and the liquid feed passage 81. Get smaller.

  An air supply passage 85 is formed in the injection main body portion 65A1. The air supply passage 85 extends substantially perpendicularly to the passage axis P. The air supply passage 85 communicates with the liquid supply passage 81 at the cross-sectional area reducing portion 83. Further, a relay air passage 86 is formed in the injection main body portion 65A1. The relay air passage 86 extends substantially parallel to the passage axis P. One end (vertically upward end) of the relay air passage 86 communicates with the sub air supply passage 57 </ b> A of the air introduction unit 50. The other end (vertical lower end) of the relay air passage 86 communicates with the air supply passage 85. Air (compressed air) is introduced into the air supply passage 85 through the sub air supply passage 57 </ b> A and the relay air passage 86. That is, air is introduced into the air supply passage 85 from the air tank 42 outside the casing 10A.

  As described above, in the cross-sectional area reducing portion 83, the pressure of the water to be fed is reduced. For this reason, the air introduced into the air supply passage 85 is sucked toward the cross-sectional area reducing portion 83 of the liquid supply passage 81 in the air supply passage 85. That is, air is supplied through the air supply passage 85 toward the cross-sectional area reducing portion 83 of the liquid supply passage 81. When air is supplied to the cross-sectional area reducing portion 83, bubbles 88 are generated in water (liquid) supplied through the liquid supply passage 81.

  As described above, in the same manner as the principle of allowing air to flow into the liquid fed by the aspirator, the jet main body 65A1 feeds air to the water fed through the liquid feeding passage 81. The water (liquid) in which the bubbles 88 are generated in the cross-sectional area reducing portion 83 is jetted from the jet port 82 of the jet main body 65A1 toward the road surface.

  Next, the operation and effect of the road cleaning vehicle 1 will be described. When the road surface is cleaned by the road surface cleaning vehicle 1, the operation is performed in the cab 5. First, the air in the air tank 42 is compressed by the air compressor 41. The compressed air is supplied to the water tank 25 through the main air supply passage 55. Then, water (liquid) is introduced from the water tank 25 to the ejection main body portions 65A1 to 65A6, 65B1 to 65B2, and 65C1 to 65C6 through the liquid introduction portion 70 (the main liquid supply passage 71 and the sub liquid supply passages 72A to 72C). The The supply state of water to each of the injection main body portions 65A1 to 65A6, 65B1 to 65B2, 65C1 to 65C6 is adjusted by the cocks 75 and 76A to 76C.

  Further, the air (compressed air) compressed by the air compressor 41 passes through the air introduction part 50 (the main liquid supply passage 55 and the sub liquid supply passages 57A to 57C), and the injection main body parts 65A1 to 65A6, 65B1 to 65B2, 65C1. Introduced in 65C6. The supply state of air to each of the injection main body portions 65A1 to 65A6, 65B1 to 65B2, 65C1 to 65C6 is adjusted by the cocks 61 and 66A to 66C.

  In each of the ejection main body portions 65A1 to 65A6, 65B1 to 65B2, and 65C1 to 65C6, water (liquid) is introduced from the liquid introduction portion 70 into the liquid feeding passage 81. Then, in the liquid supply passage 81, water is supplied toward the injection port 82. Here, in the cross-sectional area reducing part 83, the flow rate of the water to be sent is increased by the same principle as the Venturi effect, and the pressure of the water is higher than that of the other part of the liquid introduction part 70 and the liquid feeding passage 81. Get smaller.

  In each of the injection main body portions 65A1 to 65A6, 65B1 to 65B2, and 65C1 to 65C6, air is introduced from the air introduction unit 50 through the relay air passage 86 into the air supply passage 85. Air in the air tank 42 outside the casings 10A and 10B is introduced into each of the injection main body portions 65A1 to 65A6, 65B1 to 65B2, and 65C1 to 65C6.

  In the cross-sectional area reducing portion 83, the pressure of water to be fed is reduced, so that the air introduced into the air feeding passage 85 is sucked toward the cross-sectional area reducing portion 83 of the liquid feeding passage 81 in the air feeding passage 85. Is done. That is, air is supplied through the air supply passage 85 toward the cross-sectional area reducing portion 83 of the liquid supply passage 81. When air is supplied to the cross-sectional area reducing portion 83, bubbles 88 are generated in water (liquid) supplied through the liquid supply passage 81. And in each injection main-body part 65A1-65A6, 65B1-65B2, 65C1-65C6, the water (liquid) which the bubble 88 generate | occur | produced in the cross-sectional area reduction | decrease part 83 is injected toward the road surface from the injection port 82. FIG.

  Bubbles 88 contained in the ejected liquid collapse on the road surface or in the vicinity of the road surface. Clogged materials such as earth and sand and dust that have entered the gaps in the road surface are lifted by energy such as micro jets and shock waves generated when the bubbles 88 collapse. Then, the clogged material that has floated is sucked by the suction unit 15. At this time, water jetted by the jetting unit 40 is also sucked as sewage (dirt liquid) and air is sucked. By using the energy generated when the bubbles 88 collapse, the clogging can be efficiently lifted, and the clogging can be efficiently sucked.

  The clogging, sewage and air are sucked from the suction port 19A inside the casing 10A through the suction passage 17A or from the suction port 19B inside the casing 10B through the suction passage 17B. The air that has passed through the suction passage 17 </ b> A or the suction passage 17 </ b> B is guided to the first cavity 22 of the hopper 21. Since the volume of the first cavity portion 22 is larger than that of the suction passages 17A and 17B, the pressure rapidly decreases in the first cavity portion 22. For this reason, clogging and sewage are separated from the sucked air. Then, clogging substances are accumulated in the first cavity portion 22 and the sewage is stored in the sewage tank 26.

  The sucked air is purified by the screen 28 and is sent to the second cavity 23. In the second cavity 23, the sucked air is purified by the screen 28, so that clogged materials and the like are hardly included. Then, the purified air is supplied from the second cavity 23 of the hopper 21 to the third cavity 32 of the engine room 31 through the blower 30. Then, air is sent from the third cavity portion 32 through the exhaust port 35 to the outside of the exterior cover 6.

  As described above, in the road cleaning vehicle 1 of the present embodiment, in each of the injection main body portions 65A1 to 65A6, 65B1 to 65B2, and 65C1 to 65C6, the cross section area decreasing portion 83 of the liquid supply passage 81 is passed through the air supply passage 85. Air is sent. That is, in the same manner as the principle of flowing air into the liquid fed in the aspirator, in each of the injection main body portions 65A1 to 65A6, 65B1 to 65B2, and 65C1 to 65C6, air is supplied to the water fed in the liquid feeding passage 81. Is inflating. Therefore, even when high-pressure water (liquid) is not introduced into the liquid feeding passage 81, bubbles 88 are generated in the water (liquid) fed by the cross-sectional area reducing unit 83. For this reason, in the road surface cleaning vehicle 1 of this embodiment, it is not necessary to generate a high-pressure liquid, and it is not necessary to provide a high-power pump that is large and heavy. Thereby, the enlargement and weight increase of the road surface cleaning vehicle 1 are effectively prevented, and the loaded amount of the clogged clogged material is also increased. In addition, since no high-output pump is provided, noise is effectively prevented.

  Moreover, the air introduction part 50 introduces air from the air tank 42 outside the casings 10A and 10B to the air supply passages 85 of the respective injection main body parts 65A1 to 65A6, 65B1 to 65B2, 65C1 to 65C6. In the casings 10A and 10B, clogging substances are mixed in the air. On the other hand, the air tank 42 is located outside the casings 10 </ b> A and 10 </ b> B, and no clogging or the like is mixed in the air from the air tank 42. Therefore, when air is introduced from the air tank 42 into the air supply passage 85, clogged materials or the like are not mixed in the air supplied to the cross-sectional area reducing portion 83 of the liquid supply passage 81. As a result, in each of the injection main body portions 65A1 to 65A6, 65B1 to 65B2, 65C1 to 65C6, the clogging of the clogging material in the liquid supply passage 81 is effectively prevented, and the liquid is supplied through the liquid supply passage 81. Water contamination is effectively prevented.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected about the part which has the same function as 1st Embodiment, and the same function, and the description is abbreviate | omitted.

  FIG. 6 is a diagram showing an internal configuration of one casing 10A according to the present embodiment. FIG. 7 is a view of FIG. 6 viewed from the direction of the arrow U2. In the following description, only the internal configuration of the casing 10A will be described, but the internal configuration of the casing 10B is the same as the internal configuration of the casing 10A. As shown in FIGS. 6 and 7, in the present embodiment as well, the injection main body portions 65A1 to 65A6 are arranged concentrically around the suction axis VA of the suction passage 17A as in the first embodiment. The suction port 19A of the suction passage 17A is surrounded by the injection main body portions 65A1 to 65A6. And the sub air supply passage 57A of the air introduction part 50 and the sub liquid supply passage 72A of the liquid introduction part 70 are connected to the injection main body parts 65A1 to 65A6.

  In the present embodiment, corresponding diffusion cylindrical portions 91A1 to 91A6 are provided on the liquid feeding direction side (vertical downward direction side) of the respective injection main body portions 65A1 to 65A6. Cavities 92A1 to 92A6 are formed inside the diffusion cylindrical portions 91A1 to 91A6. The diffusion cylindrical portions 91A1 to 91A6 are connected to each other via a drive ring 93A. The drive ring 93A extends in an annular shape around the suction axis VA.

  Note that corresponding diffusion cylindrical portions 91B1 to 91B6 are also provided on the liquid feeding direction sides of the respective injection main body portions 65B1 to 65B6, and inside the diffusion cylindrical portions 91B1 to 91B6, the cavity portions 92B1 to 92B6 are provided. Is formed. The diffusion cylindrical portions 91B1 to 91B6 are connected to each other via the drive ring 93B.

  FIG. 8 is a diagram illustrating a configuration of a drive ring 93A provided inside one casing 10A. 9 to 12 are diagrams showing the configuration of one injection main body 65A1 and one diffusion cylindrical portion 91A1 provided inside the casing 10A. In the following description, only the drive ring 93A is described, but the drive ring 93B is also driven in the same manner as the drive ring 93A. Further, in the following description, only the injection main body 65A1 and the diffusion cylindrical portion 91A1 will be described, but the injection main body 65A2 to 65A6, 65B1 to 65B6 and the diffusion cylindrical portions 91A2 to 92A6 and 92B1 to 92B6 are also injection main bodies. It is driven in the same manner as the portion 65A1 and the diffusion tubular portion 91A1, and water (liquid) is jetted toward the road surface.

  As shown in FIGS. 8 to 12, the drive ring 93A is provided with six hole portions 95 penetrating the drive ring 93A. The diffusion cylindrical portion 91A1 is attached to the drive ring 93A via the connecting pin 96. That is, the linking pin 96 is inserted into the corresponding hole 95 and fixed to the diffusion cylinder 91A1, whereby the diffusion cylinder 91A1 is attached to the drive ring 93A.

  The diffusion cylindrical portion 91A1 is provided with two slit portions 101a and 101b that penetrate the diffusion cylindrical portion 91A1. The diffusion cylindrical portion 91A1 is attached to the injection main body portion 65A1 via the two connecting pins 102a and 102b. That is, the diffusion cylindrical portion 91A1 is attached to the injection main body 65A1 by inserting the connecting pins 102a and 102b through the corresponding slit portions 101a and 101b and fixing them to the injection main body 65A1. Here, the slit portions 101 a and 101 b are extended along an oblique direction inclined with respect to the passage axis P of the liquid feeding passage 81. That is, the slit portions 101a and 101b extend in a spiral shape with the passage axis P as the center.

  A cylinder 103A is attached to the drive ring 93A. When the cylinder 103A expands and contracts, the drive ring 93A is driven, and the drive ring 93A rotates around the suction axis VA (arrow R1 in FIG. 8). As a result, the driving force is transmitted from the driving ring 93A to the diffusing cylindrical portion 91A1 via the connecting pin 96. When the driving force is transmitted, the diffusion cylindrical portion 91A1 moves along the oblique direction in which the slit portions 101a and 101b are extended with respect to the injection main body portion 65A1. That is, the diffusion cylindrical portion 91A1 rotates about the passage axis P with respect to the injection main body portion 65A1 (arrow R2 in FIG. 8) and moves along the passage axis P (arrow R3 in FIG. 8). .

  The diffusion cylindrical portion 91A1 is movable with respect to the injection main body portion 65A1 between a non-diffusion position (position shown in FIGS. 9 and 10) and a diffusion position (position shown in FIGS. 11 and 12). . The non-diffusion position is the position on the most vertically upward side in the movement range of the diffusion cylindrical part 91A1, and the diffusion position is the position on the most vertically downward side in the movement range of the diffusion cylindrical part 91A1. 10 is a view of FIG. 9 viewed from the direction of arrow S1, and FIG. 12 is a view of FIG. 11 viewed from the direction of arrow S2.

  Also in the present embodiment, as in the first embodiment, the injection main body portion 65A1 is provided with a liquid supply passage 81, an air supply passage 85, and a relay air passage 86. The liquid feed passage 81 is provided with an injection port 82 and a cross-sectional area reducing portion 83. In the present embodiment, the hollow portion 92 </ b> A <b> 1 inside the diffusion cylindrical portion 91 </ b> A <b> 1 communicates with the liquid feeding passage 81 at the injection port 82. In diffusion cylindrical part 91A1, the cross-sectional area of hollow part 92A1 perpendicular | vertical to channel | path axis P becomes large as it goes to a liquid feeding direction. In the present embodiment, the diffusion cylindrical portion 91A1 is formed in a skirt shape.

  In the present embodiment, the relay air passage 86 communicates with the air supply passage 85 and also communicates with the hollow portion 92A1 inside the diffusion cylindrical portion 91A1. The relay air passage 86 communicates with the hollow portion 92A1 at the air outlet 105. Also in the present embodiment, air (compressed air) is introduced into the air supply passage 85 through the sub air supply passage 57A and the relay air passage 86 as in the first embodiment. That is, air is introduced into the air supply passage 85 from the air tank 42 outside the casing 10A. In the present embodiment, air is introduced from the air outlet 105 into the cavity 92A1 through the sub air supply passage 57A and the relay air passage 86.

  The diffusion cylindrical portion 91A1 includes an inner peripheral portion 107 that defines the hollow portion 92A1 and an opening 108 that opens toward the road surface. As shown in FIGS. 9 and 10, when the diffusion cylindrical portion 91A1 is located at the non-diffusion position, the inner peripheral portion 107 of the diffusion cylindrical portion 91A1 is arranged in the radial direction of the diffusion cylindrical portion 91A1 from the air outlet 105. Located away. For this reason, even if air is introduced into the hollow portion 92A1 from the air outlet 105, the air does not move along the inner peripheral portion 107 of the diffusion cylindrical portion 91A1, but the inner peripheral portion in the radial direction of the diffusion cylindrical portion 91A1. Go to the road surface through a position away from 107. For this reason, when diffusion cylindrical part 91A1 is located in a non-diffusion position, the water (liquid) injected from the injection port 82 of injection main-body part 65A1 is not diffused by cavity part 92A1. That is, the water (liquid) in which the bubbles 88 are generated travels toward the road surface without being diffused after being ejected from the ejection port 82.

  On the other hand, as shown in FIGS. 11 and 12, when the diffusion tubular portion 91A1 is located at the diffusion position, the inner peripheral portion 107 of the diffusion tubular portion 91A1 is the air outlet in the radial direction of the diffusion tubular portion 91A1. It is located in the vicinity of 105. For this reason, when air is introduced into the hollow portion 92A1 from the air outlet 105, the air moves along the inner peripheral portion 107 of the diffusion tubular portion 91A1. For this reason, in the hollow portion 92A1, an air flow f1 toward the road surface is generated along the inner peripheral portion 107 of the diffusion tubular portion 91A1. As described above, in the diffusion cylindrical portion 91A1, the cross-sectional area of the hollow portion 92A1 perpendicular to the passage axis P increases in the liquid feeding direction (road surface). For this reason, when the air flow f1 along the inner peripheral portion 107 of the diffusion cylindrical portion 91A1 is generated, the water (liquid) injected from the injection port 82 of the injection main body portion 65A1 is diffused in the cavity portion 92A1. The That is, when the diffusion cylindrical portion 91A1 is located at the diffusion position, the water (liquid) in which the bubbles 88 are generated is air along the inner peripheral portion 107 of the diffusion cylindrical portion 91A1 after being ejected from the ejection port 82. It is diffused by the flow f1 and heads for the road surface.

  The water ejected from the ejection port 82 is diffused in the hollow portion 92A2 inside the diffusion cylindrical portion 91A1, so that the water in which the bubbles 88 are generated is dispersed over a wide range. Therefore, when the diffusion cylindrical portion 91A1 is located at the diffusion position, a wide range of clogged substances can be lifted by the water (liquid) ejected from one ejection port 82.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected about the part which has the same part as 2nd Embodiment, and the same function, and the description is abbreviate | omitted.

  FIGS. 13 and 14 are diagrams showing the configuration of one injection main body 65A1 and one diffusion cylinder 91A1 provided inside the casing 10A. In the following description, only the injection main body portion 65A1 and the diffusion cylindrical portion 91A1 will be described, but the injection main body portions 65A2 to 65A6, 65B1 to 65B6 and the diffusion cylindrical portions 91A2 to 92A6 and 92B1 to 92B6 are also injection main bodies. In the same manner as the portion 65A1 and the diffusion tubular portion 91A1, water (liquid) is jetted toward the road surface.

  As shown in FIGS. 13 and 14, in the present embodiment, unlike the second embodiment, the drive ring 93A (93B) is not provided in the casing 10A (10B). Accordingly, the diffusion cylindrical portion 91A1 is not movable along the passage axis P with respect to the injection main body portion 65A1, and is fixed with respect to the injection main body portion 65A1. In the present embodiment, in the same manner as in the case where the diffusion cylindrical portion 91A1 is located at the diffusion position in the second embodiment, the inner peripheral portion 107 of the diffusion cylindrical portion 91A1 is the air flow in the radial direction of the diffusion cylindrical portion 91A1. It is located in the vicinity of the outlet 105. For this reason, when air is introduced into the hollow portion 92A1 from the air outlet 105, the air moves along the inner peripheral portion 107 of the diffusion tubular portion 91A1.

  In the present embodiment, the diffusion cylindrical portion 91A1 is provided with a protrusion 111 that protrudes from the inner peripheral portion 107 toward the passage axis P. The protrusion 111 extends spirally around the passage axis P. By providing the projection 111, the air introduced from the air outlet 105 into the cavity 92A1 moves spirally around the passage axis P and travels toward the road surface. Therefore, in the present embodiment, in the hollow portion 92A1, an air flow f2 is generated along the inner peripheral portion 107 of the diffusion tubular portion 91A1 and spirally around the passage axis P toward the road surface. A projection angle adjusting lever 112 that adjusts the angle of the projection 111 with respect to the inner peripheral portion 107 is attached to the diffusion cylindrical portion 91A1.

Also in this embodiment, in diffusion cylindrical part 91A1, the cross-sectional area of hollow part 92A1 perpendicular | vertical to channel | path axis P becomes large as it goes to a liquid feeding direction (road surface). For this reason, when the air flow f2 along the inner peripheral portion 107 of the diffusion cylindrical portion 91A1 is generated, the water (liquid) injected from the injection port 82 of the injection main body portion 65A1 is diffused in the cavity portion 92A1. The In this embodiment,
Since the air flow f2 spirals toward the road surface around the passage axis P, a centrifugal force F is generated in a direction away from the passage axis P. By the centrifugal force F acting, the water jetted from the jet port 82 of the jet main body 65A1 is further diffused. That is, the water (liquid) in which the bubbles 88 are generated is diffused by the air flow f2 and the centrifugal force F along the inner peripheral portion 107 of the diffusion cylindrical portion 91A1 after being ejected from the ejection port 82, and heads toward the road surface.

  The water jetted from the jet port 82 is further diffused by the centrifugal force F in the hollow portion 92A2 inside the diffusion cylindrical portion 91A1, so that the water in which the bubbles 88 are generated is spread over a wider range. Therefore, the clogged material can be lifted in a wider range by the water (liquid) ejected from one ejection port 82.

(Modification)
In the above-described embodiment, two casings 10A and 10B are provided, and one suction port (19A and 19B) and six injection main bodies (65A1 to 65A6 and 65B1) are provided in the respective casings (10A and 10B). ~ 65B6) is provided, but is not limited thereto. That is, the number of casings (10A, 10B), the number of suction ports (19A, 19B) located inside each casing (10A, 10B), and the number of injection main bodies (65A1 to 65A6, 65B1 to 65B6) Is not limited to the above-described embodiment.

  In the above-described embodiment, air (compressed air) is introduced into the air supply passage 85 from the air tank 42 through the air introduction unit 50, but is not limited thereto. For example, the atmosphere outside the casings 10 </ b> A and 10 </ b> B (ground air) may be introduced into the air supply passage 85 through the air introduction unit 50. In other words, air may be introduced into the air supply passage 85 from the outside of the casings 10 </ b> A and 10 </ b> B by the air introduction unit 50.

  Accordingly, the road cleaning vehicle 1 includes a casing (10A, 10B) in which openings (11A, 11B) that open toward the road surface are formed, and a suction port (19A, 19B) located inside the casing (10A, 10B). ) From the suction passage (17A, 17B) through the suction passage (17A, 17B) and the injection body (65A1 to 65A6, 65B1 to 65B6) provided inside the casing (10A, 10B), the casing (10A, And an injection unit (40) that injects the liquid, in which bubbles (88) are generated, from the injection port (82) located inside 10B) toward the road surface. The injection body (65A1 to 65A6, 65B1 to 65B6) of the injection unit (40) extends along the passage axis (P) and faces the injection port (82) located at the end on the liquid feeding direction side. The liquid supply passage (81) through which the liquid is supplied is provided, and the passage shaft (P) is compared with the other portion of the liquid supply passage (81) at the cross-sectional area reduction portion (83) of the liquid supply passage (81). It suffices if the cross-sectional area perpendicular to) is partially reduced. The injection main body portions (65A1 to 65A6, 65B1 to 65B6) communicate with the liquid feeding passage (81) at the cross-sectional area reducing portion (83) and head toward the cross-sectional area reducing portion (83) of the liquid feeding passage (81). It is only necessary to provide an air supply passage (85) for generating bubbles (88) in the liquid by supplying air. The injection unit (40) includes a liquid introduction part (70) for introducing liquid into the liquid supply passage (81), and an air introduction for introducing air into the air supply passage (85) from the outside of the casing (10A, 10B). The part (50) may be provided.

  The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Road cleaning car, 10A, 10B ... Casing, 11A, 11B ... Opening part, 15 ... Suction unit, 17A, 17B ... Suction passage, 19A, 19B ... Suction port, 40 ... Injection unit, 50 ... Air introduction part, 65A1 ˜65A6, 65B1 to 65B6... Injection main body portion, 81... Liquid feeding passage, 82... Jetting port, 83.

Claims (2)

A casing in which an opening that opens toward the road surface is formed;
A suction unit that performs suction through a suction passage from a suction port located inside the casing;
An injection unit that includes an injection main body provided inside the casing, and that injects liquid in which bubbles are generated from an injection port located inside the casing toward the road surface;
Comprising
The injection main body of the injection unit is
A liquid supply passage that extends along the passage axis and feeds the liquid toward the ejection port located at the end on the liquid feeding direction side, and has a cross-sectional area perpendicular to the passage axis. A liquid-feeding passage having a cross-sectional area reduction portion that is partially smaller than other portions of the passage;
An air-feeding passage that communicates with the liquid-feeding passage at the cross-sectional area reducing portion and feeds air toward the cross-sectional area reducing portion of the liquid-feeding passage to generate the bubbles in the liquid;
With
The injection unit is
A liquid introduction part for introducing the liquid into the liquid feeding path;
An air introduction part for introducing the air into the air supply passage from the outside of the casing;
Road sweeper equipped with. The injection unit is a diffusion cylindrical portion that is provided on the liquid supply direction side of the injection main body and in which a hollow portion that communicates with the liquid supply passage at the injection port is formed, and the liquid supply direction A diffusion tubular portion in which the cross-sectional area of the hollow portion perpendicular to the passage axis increases toward
The air introduction part introduces the air from the air outlet into the hollow part inside the diffusion cylindrical part, and flows the air flowing toward the road surface along the inner peripheral part of the diffusion cylindrical part. generate,
The road sweeper according to claim 1.

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