JP6671784B2 - High pressure washing car - Google Patents

Description

  The present invention relates to a high-pressure washing vehicle.

  2. Description of the Related Art Conventionally, a high-pressure washing vehicle has been used for washing various pipes such as a sewer pipe. The high-pressure washing vehicle was equipped with a tank for storing washing water, an injector for injecting the washing water in the tank, a pump for pumping the washing water in the tank, a hose for guiding the pumped washing water to the injector, and a hose wound thereon. It has a hose reel and the like. During the operation, the hose is drawn out from the hose reel, and high-pressure washing water is sprayed from a sprayer attached to the end of the hose onto the workpiece such as a sewer pipe to wash the workpiece.

  As a high-pressure washing vehicle of this type, a pressure control valve is provided in a washing water supply passage between a pump and a hose, and when the pressure of the washing water flowing from the pump to the pressure control valve is higher than a predetermined value, the washing water is supplied. There is a configuration in which a part is returned to a tank (for example, see Patent Document 1). According to such a high-pressure washing vehicle, it is possible to prevent deterioration of the washing water supply path due to excessive pressure of the washing water.

JP 2008-246412 A

  In the above-described high-pressure washing vehicle, when a part of the washing water is returned to the tank, the washing water is returned to a tank (hereinafter, also referred to as “washing water return pipe”) connected to a pressure control valve for guiding the washing water to the tank. , High pressure washing water passes through. At this time, cavitation may occur due to the high-speed water flow in the washing water return pipe. Cavitation is a phenomenon that occurs due to a local pressure drop in a high-speed water flow, and when cavitation bubbles disappear, an impact pressure is generated when the cavitation bubbles disappear. Erosion may occur on the inner wall of the washing water return pipe, and the durability of the washing water return pipe may be reduced.

  Therefore, an object of the present invention is to provide a high-pressure washing vehicle capable of suppressing erosion of a washing water return pipe caused by cavitation.

(1) A high-pressure washing vehicle according to the present invention includes a tank provided with an air breather for storing washing water and bleeding air when the pressure becomes equal to or higher than a predetermined pressure, and an injection for injecting the washing water in the tank. Tool, a pump for pumping the cleaning water from the tank to the spraying tool, a cleaning water supply path connecting the pump and the spraying tool, and a cleaning water supply path provided in the cleaning water supply path, the cleaning water for the spraying tool. off valve for switching the presence or absence of supply, a pressure control valve that is provided between the pump and the on-off valve in the wash water supply path, a high-pressure washing vehicles comprising, said tank and said pressure control valve In the meantime, apart from the washing water supply path, when the pressure of the washing water flowing into the pressure control valve is higher than a predetermined value, a part of the washing water in the washing water supply path is transferred to the tank. Cleaning water return piping and The channel is provided, wherein with back wash water pipe is connected to the pressure control valve, the flow path is connected to the pipe and the tank return the wash water, further, the pressure control valve of the return wash water pipe An air introduction hole is provided in the tube wall near the side , and the air introduction hole is connected to the tank via a water leakage pipe different from the water return pipe and the flow path. The opening on the tank side is provided at a position higher than the level of the washing water in the tank, and when the washing water returned to the tank passes through the washing water return pipe , air in the tank is removed. The washing water is introduced into the washing water return pipe from the air introduction hole through the water leakage flow path, and the washing water leaks from the air introduction hole when passing through the washing water return pipe at a lower speed than when passing therethrough. The washing water flows through the water leakage flow path Characterized in that it is configured so that back to the tank.

  According to the above configuration (1), when the washing water returned to the tank passes through the washing water return pipe, air is introduced into the washing water return pipe from the air introduction hole. Pressure drop can be suppressed. Thereby, since cavitation can be suppressed from occurring in the cleaning water return pipe, erosion of the cleaning water return pipe due to cavitation can be suppressed.

Also , even if washing water leaks from the air introduction hole when the flow rate of the washing water passing through the washing water return pipe is low, the washing water leaking through the leaking flow path is returned to the tank, and the opening of the leaking flow path on the tank side is opened. The air in the tank taken in from the tank can be introduced into the washing water return pipe. Therefore, it is possible to introduce air into the washing water return pipe while preventing a decrease in workability due to water leakage. Further, since the washing water leaked from the air introduction hole is returned to the tank, the washing water is not wasted and the operation cost can be reduced.

( 2 ) In the high-pressure washing vehicle according to ( 1 ), the washing water return pipe is a double pipe having an inner pipe and an outer pipe, and the air introduction hole is provided in a pipe wall of the inner pipe. Preferably, an opening of the water leakage flow path on the side of the washing water return pipe is provided on a pipe wall of the outer pipe. According to this configuration, the number and positions of the air introduction holes can be easily adjusted since the number of the air leakage holes is not provided as compared with the case where the water leakage channels are directly connected to the air introduction holes. Can be done. In addition, it is possible to easily replace the inner pipe provided with the air introduction hole depending on the situation.

  ADVANTAGE OF THE INVENTION According to the high pressure washing | cleaning vehicle of this invention, since the erosion of the washing water return piping resulting from cavitation can be suppressed, the durability of the washing water return piping can be improved.

It is a side view of a high pressure washing car in one embodiment of the present invention. It is a rear view of the high pressure washing | cleaning vehicle of FIG. It is a figure which shows the water circuit of the high pressure washing | cleaning vehicle of FIG. FIG. 2 is an enlarged view of a pressure control valve provided in the high-pressure washing vehicle of FIG. 1 and peripheral components thereof.

  Hereinafter, a configuration of a preferred embodiment of the high-pressure washing vehicle of the present invention will be described with reference to FIGS. FIG. 1 is a side view of a high-pressure washing vehicle according to an embodiment of the present invention. FIG. 2 is a rear view of the high-pressure washing vehicle shown in FIG. FIG. 3 is a diagram showing a water circuit of the high-pressure washing vehicle in FIG. In the following description, the front-rear direction indicates the same direction as the traveling direction of the vehicle.

  As shown in FIG. 1, the high-pressure washing vehicle 1 includes a cab 2, a chassis 3, wheels 4, and the like. On the undercarriage 3, a tank 11 for storing the washing water 100 (see FIG. 3), a hose 12 and a sub-hose 13 (see FIG. 2) for guiding the washing water 100 to an object to be washed, a hose reel 14 around which the hose 12 is wound, and a sub-hose A sub hose reel 15 (see FIG. 2) around which the reel 13 is wound is provided.

  Further, on the chassis 3 on the rear side of the tank 11, a turntable 5 is installed so as to be pivotable about a vertical axis. The hose reel 14 is supported by a frame 31 provided on the turntable 5, and is attached so as to be rotatable forward and backward around a horizontal axis X1.

  As described later, the hose reel 14 is driven to rotate by a hydraulic pump 41 (see FIG. 3). When the hose reel 14 rotates in the forward direction, the hose 12 is paid out from the hose reel 14. On the other hand, when the hose reel 14 rotates in the reverse direction, the hose 12 is wound around the hose reel 14. As shown in FIG. 3, a cleaning nozzle 33 as a jetting device for jetting the cleaning water 100 is detachably attached to a tip of the hose 12.

  As shown in FIG. 1, an operation panel 51 is fixed to a front surface of the frame 31. By operating various switches (not shown) of the operation panel 51, rotation driving of the hose reel 14, operation of a pump 16 (see FIG. 3) described later, and the like are performed.

  On the undercarriage 3 on the rear side of the tank 11, a sub turntable 6 is installed so as to be pivotable about a vertical axis as shown in FIG. The sub hose reel 15 is supported by a frame 32 provided on the sub turntable 6, and is attached so as to be rotatable forward and backward around a horizontal axis X2.

  The sub hose reel 15 is manually operated. That is, when the handle 34 attached to the sub hose reel 15 is rotated, the sub hose reel 15 is also rotated, and the sub hose 13 is fed out or wound up. In the present embodiment, the sub-hose 13 has a smaller diameter than the hose 12, and as shown in FIG. 3, a cleaning gun 35 as a spraying device for spraying the cleaning water 100 is detachably attached to the tip of the sub-hose 13. Installed.

  As shown in FIG. 1, a pump housing chamber 21 is provided in front of the tank 11. A pump 16 (see FIG. 3) for pumping the cleaning water 100 from the tank 11 to the cleaning nozzle 33 and the cleaning gun 35 is stored in the pump housing chamber 21.

  The hose 12 is a part of a cleaning water supply path connecting the pump 16 and the cleaning nozzle 33. The sub hose 13 is a part of a cleaning water supply path connecting the pump 16 and the cleaning gun 35.

  Next, the water circuit of the high-pressure washing vehicle 1 according to the present embodiment will be described mainly with reference to FIG.

  As shown in FIG. 3, one end of a flow channel 61 is connected to the bottom of the tank 11. The other end of the flow path 61 is connected to the pump 16. The flow path 61 is provided with an on-off valve 80 and a strainer 62 in order from the upstream side to the downstream side. By opening the on-off valve 80, the pump 16 can suck the cleaning water 100 in the tank 11.

  A flow path 74 is connected to a middle part of the flow path 61 downstream of the on-off valve 80 and upstream of the strainer 62. An on-off valve 79 is provided at a downstream end of the flow path 74. The flow path 74 is for discharging the cleaning water 100 remaining in the tank 11 to the outside by the on-off valve 79 after the cleaning is completed.

  One end of a flow path 63 that is a part of the cleaning water supply path is connected to the discharge side of the pump 16. The pump 16 sucks the cleaning water 100 stored in the tank 11 via the flow channel 61 and discharges the cleaning water 100 as high-pressure cleaning water 100 to the flow channel 63.

  The pump 16 is connected to a traveling engine 46 via a pulley 42, a V-belt 43, a drive shaft 44, and a PTO (power take-out device) 45. Thus, the pump 16 is driven by the traveling engine 46. The drive shaft 44 is connected to the hydraulic pump 41 via a power transmission mechanism 47. The hydraulic pump 41 is provided in a hydraulic circuit (not shown) that rotationally drives the hose reel 14.

  The hose 12 wound around the hose reel 14 is connected to a flow path 64 that is a part of the cleaning water supply path. As described above, the cleaning nozzle 33 is attached to the tip of the hose 12. The flow path 64 is provided with an on-off valve 73 for switching whether or not the cleaning water 100 is supplied to the cleaning nozzle 33. The upstream end of the flow path 64 is connected to the manifold 70, and the manifold 70 is provided with a pressure gauge 77. With such a configuration, the washing water 100 flowing into the manifold 70 is guided to the flow path 64. When the on-off valve 73 is opened, the cleaning water 100 is jetted from the cleaning nozzle 33 through the hose reel 14 and the hose 12.

  The sub-hose 13 wound around the sub-hose reel 15 is connected to a flow path 65 which is a part of the cleaning water supply path. As described above, the cleaning gun 35 is attached to the tip of the sub hose 13. In addition, the flow path 65 is provided with an on-off valve 76 for switching whether or not the cleaning water 100 is supplied to the cleaning gun 35. The upstream end of the flow path 65 is connected to the manifold 70. With such a configuration, the cleaning water 100 flowing into the manifold 70 is guided to the flow path 65. When the on-off valve 76 is opened, the cleaning water 100 is jetted from the cleaning gun 35 via the sub hose reel 15 and the sub hose 13.

  One end of a flow path 67 is connected to a flow path 66 that is a part of the cleaning water supply path connected to the upstream end of the manifold 70. An on-off valve 68 is provided at the other end of the flow path 67. The flow path 67 is for releasing the washing water 100 remaining in the flow path 66 to the outside by an on-off valve 68 after freezing to prevent freezing.

  A pressure control valve 91 is provided in the cleaning water supply path between the pump 16 and the manifold 70. That is, the pressure control valve 91 is connected to the pump 16 via the channel 63 and to the manifold 70 via the channel 66.

  The pressure control valve 91 mainly guides the cleaning water 100 in the flow path 63 to the flow path 66. When the pressure of the cleaning water 100 flowing from the flow path 63 is higher than a predetermined value (target pressure), the cleaning water 100 Is returned to the tank 11. The cleaning water 100 returned to the tank 11 is guided to a cleaning water return pipe 92 connected to a pressure control valve 91 and a flow path 93 connecting the cleaning water return pipe 92 and the tank 11. Thus, the pressure of the washing water 100 guided to the flow path 66 is controlled by the pressure control valve 91 so as to be equal to or lower than a predetermined target pressure. In addition, an air breather 11b for bleeding the air in the tank 11 that has become equal to or higher than a predetermined pressure is provided at an upper portion of the tank 11.

  Next, the pressure control valve 91 and its peripheral parts used in the present embodiment will be described mainly with reference to FIG.

  As shown in FIG. 4, the pressure control valve 91 has an inlet 91 a into which the cleaning water 100 from the pump 16 flows in through the channel 63 and an outlet for guiding the flowing cleaning water 100 to the channel 66. An outlet 91 c for guiding the cleaning water 100 returned to the tank 11 to the cleaning water return pipe 92 is provided. A pressure adjustment handle 91d for adjusting the target pressure of the washing water 100 is provided at the left end in FIG. 4 of the pressure control valve 91. By rotating the pressure adjustment handle 91d, the above-described target pressure is adjusted. Can be adjusted.

  The washing water return pipe 92 is a double pipe having an inner pipe 94 and an outer pipe 95. The upstream end of the inner pipe 94 communicates with the outlet 91c of the pressure control valve 91, and the downstream end of the inner pipe 94 communicates with the flow path 93 (see FIG. 3).

  An opening 95 a communicating with one end of the flow path 96 is provided in the lower tube wall of the outer tube 95 in FIG. 4. An on-off valve 97 is provided at the other end of the flow path 96. The flow path 96 is for releasing the cleaning water 100 remaining in the cleaning water return pipe 92 to the outside by an on-off valve 97 after the cleaning is completed in order to prevent freezing.

  In the lower tube wall of the inner tube 94 in FIG. 4, three air introduction holes 94a are provided at equal intervals. In addition, three air introduction holes 94a are provided at equal intervals at positions facing the three air introduction holes 94a on the upper tube wall of the inner tube 94 in FIG. That is, a total of six air introduction holes 94a are provided in the tube wall of the inner tube 94.

  Of the six air introduction holes 94a, at least two air introduction holes 94a on the outlet 91c side of the pressure control valve 91 are provided near the outlet 91c. Here, “near” refers to a region in which cavitation is likely to occur due to high-speed water flow in a conventional washing water return pipe, for example, between the outlet 91c and a location 30 to 50 cm downstream from the outlet 91c. Refers to the area between.

  With respect to the diameter of the air introduction hole 94a, a pressure difference is generated inside and outside the inner tube 94 due to the high-speed water flow when the washing water 100 returned to the tank 11 passes through the inside of the inner tube 94. Any size is sufficient as long as air can be introduced into the pipe 94. For example, the diameter of the air introduction hole 94a can be appropriately set in consideration of the flow rate of the cleaning water 100, the location where the air introduction hole 94a is provided, and the like, and is preferably, for example, about 5 to 15 mm. The preferred size of the hole diameter depends on the capacity of the pump 16.

  As described above, in the present embodiment, when the cleaning water 100 returned to the tank 11 passes through the inner pipe 94 of the cleaning water return pipe 92, the pressure difference between the inside and outside of the inner pipe 94 causes the air from the air introduction hole 94a to enter the inner pipe 94. Since air is introduced, the pressure drop in the inner pipe 94 can be suppressed. Thus, the occurrence of cavitation in the inner pipe 94 can be suppressed, so that the erosion of the inner pipe 94 (wash water return pipe 92) due to cavitation can be suppressed.

  Further, an opening 95b for returning the washing water 100 leaked from the air introduction hole 94a to the tank 11 is provided in the upper tube wall of the outer tube 95 in FIG. The opening 95b and the opening 11a of the tank 11 (see FIG. 3) are connected by a water leakage channel 98 (see FIG. 3). That is, the opening 95b is an opening on the side of the washing water return pipe 92 of the water leakage channel 98, and the opening 11a is an opening on the tank 11 side of the water leakage channel 98. Further, as shown in FIG. 3, the opening 11 a is provided at a position higher than the water surface 100 a of the cleaning water 100 in the tank 11. As a result, the leaked cleaning water 100 can be returned from the opening 11a into the tank 11, and the air in the tank 11 taken in from the opening 11a can be introduced into the inner pipe 94. The water surface 100a of the cleaning water 100 refers to the water surface of the cleaning water 100 when the maximum water storage amount specified in the tank 11 is stored.

  As described above, in the present embodiment, even if the cleaning water 100 leaks from the air introduction hole 94a when the flow rate of the cleaning water 100 passing through the inner pipe 94 is low, the cleaning water 100 leaking through the water leakage flow path 98 is returned to the tank 11. At the same time, the air in the tank 11 taken in from the opening 11 a of the water leakage channel 98 on the tank 11 side can be introduced into the inner pipe 94. Therefore, air can be introduced into the inner pipe 94 while preventing a decrease in workability due to water leakage. Further, since the cleaning water 100 leaked from the air introduction hole 94a is returned to the tank 11, the cleaning water 100 is not wasted and the operation cost can be reduced.

  Further, as described above, in the present embodiment, the cleaning water return pipe 92 is a double pipe having the inner pipe 94 and the outer pipe 95, and the air introduction hole 94a is provided in the pipe wall of the inner pipe 94. An opening 95 b of the water leakage passage 98 on the side of the washing water return pipe 92 is provided on the tube wall of the outer tube 95. According to this configuration, as compared with the case where the water leakage passage 98 is directly connected to the air introduction hole 94a, the number of the air introduction holes 94a is reduced because the water leakage passages 98 are not provided by the number of the air introduction holes 94a. The position can be easily adjusted. In addition, depending on the situation, the replacement of the inner pipe 94 provided with the air introduction hole 94a can be easily performed.

  As described above, the preferred embodiments of the present invention have been described, but they are merely specific examples, and do not limit the present invention. The specific configuration and the like can be appropriately changed in design.

  For example, in the above embodiment, six air introduction holes are provided in the cleaning water return pipe, but in the present invention, at least one air introduction hole is provided in the pipe wall near the pressure control valve side of the cleaning water return pipe. The number of air introduction holes is not particularly limited.

  In the above embodiment, a double pipe is used as the washing water return pipe, but the present invention is not limited to this, and a single pipe of washing water return pipe may be used.

  Further, in the above embodiment, the cleaning nozzle and the cleaning gun are used as the spraying device for spraying the cleaning water.

DESCRIPTION OF SYMBOLS 1 High-pressure washing car 2 Operator's cab 3 Chassis 4 Wheels 5 Turntable 6 Sub-turntable 11 Tank 11a Opening 12 on the tank side of water leakage flow passage Hose (washing water supply path)
13 Sub hose (wash water supply path)
14 Hose reel 15 Sub hose reel 16 Pump 21 Pump storage chamber 31, 32 Frame 33 Cleaning nozzle (sprayer)
34 Handle 35 Cleaning gun (sprayer)
41 hydraulic pump 42 pulley 43 V-belt 44 drive shaft 45 PTO
46 traveling engine 47 power transmission mechanism 51 operation panel 62 strainer 63, 64, 65, 66 flow path (wash water supply path)
70 Manifold 73, 76 Open / close valve 77 Pressure gauge 91 Pressure control valve 91d Pressure adjustment handle 92 Wash water return pipe 94 Inner pipe 94a Air introduction hole 95 Outer pipe 95b Opening of wash water return pipe side of water leak flow path 98 Water leak flow path 100 Washing water 100a Washing water level in tank

Claims (2)

A tank provided with an air breather for storing cleaning water and bleeding out the internal air when the pressure exceeds a predetermined pressure ,
An injector for injecting the washing water in the tank,
A pump for pumping the washing water from the tank to the sprayer,
A washing water supply path connecting the pump and the injector;
An on-off valve that is provided in the washing water supply path and switches the presence or absence of the supply of washing water to the sprayer;
A pressure control valve that is provided between the pump and the on-off valve in the wash water supply path,
A high-pressure washing vehicle comprising:
Between the pressure control valve and the tank, separately from the washing water supply path, when the pressure of the washing water flowing into the pressure control valve is higher than a predetermined value, the washing in the washing water supply path is performed. A washing water return pipe and a flow path for returning a part of the water to the tank are provided,
The washing water return pipe is connected to the pressure control valve, and the flow path is connected to the washing water return pipe and the tank,
Further, an air introduction hole is provided in a pipe wall near the pressure control valve side of the washing water return pipe , and the air introduction hole is provided through a water leakage flow path different from the water return pipe and the flow path. Connected to the tank,
The opening on the tank side of the water leakage flow path is provided at a position higher than the level of the washing water in the tank,
When the washing water returned to the tank passes through the washing water return pipe , air in the tank is introduced into the washing water return pipe from the air introduction hole through the water leakage flow path ,
Washing water at a low speed when passing through the back wash water pipe, wash water leaking from the air inlet holes are configured to so that is returned to the tank through the leakage passage than when the passage A high pressure washing car characterized by the above. The washing water return pipe is a double pipe having an inner pipe and an outer pipe,
The air introduction hole is provided in a pipe wall of the inner pipe,
Wherein the back washing water pipe side of the opening of the leakage flow path, high-pressure cleaning vehicle according to claim 1 is provided in the tube wall of the outer tube.

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