Attractor Car

Abstract

To provide a suction vehicle that can safely and efficiently supply water to a water-sealed pump. [Solution] The suction vehicle 2 is equipped with a receiver tank 5 for collecting the object to be collected and a water-sealed pump 25 that generates an airflow by increasing or decreasing the pressure of the air inside the receiver tank 5. A pipe 7 that can communicate with the receiver tank 5 is connected to the suction port 25a of the water-sealed pump 25, and a water supply pipe 31 having a water inlet 32 ​​that can draw water from the outside is connected to the pipe 7.

Description

Technical Field

[0001] The present invention relates to a suction vehicle.

Background Art

[0002] Conventionally, a suction vehicle having a receiver tank and a suction device mounted on a vehicle body has been known (see, for example, Patent Document 1). In this suction vehicle, a water-sealed pump is provided as a vacuum pump that pressurizes and depressurizes the air in the receiver tank to generate an air flow. Then, the water stored in the water tank can be used not only for washing but also for sealing water or cooling the water-sealed pump.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, the water-sealed pump used in the above-described suction vehicle has only sealing water in the gap between the casing and the impeller, and has the advantage that foreign matter is difficult to bite in. In this respect, it is superior to a Roots blower. However, when a water-sealed pump is used, the following problems are concerned. In the above-described suction vehicle, water was injected from the outside into a moisture separator and water tank called a fourth catcher, but since high-temperature pressurized air from the water-sealed pump flows into the fourth catcher, the water supply during operation may be dangerous. On the other hand, the water-sealed pump has a structure that suppresses the water temperature due to the evaporation of the sealing water, and the water gradually decreases, so the frequency of water supply is high and a large amount of water is required. In addition, in cold regions, it was necessary to drain the sealing water of the water-sealed pump at the end of each operation to prevent freezing, but since a large amount of sealing water is required when starting the water-sealed pump, the water supply work before operation took a long time.

[0005] This invention has been made in view of the circumstances described above, and aims to provide a suction vehicle that can safely and efficiently supply water to a water-sealed pump. [Means for solving the problem]

[0006] The present invention provides the following means for solving the above-mentioned problems. Specifically, the present invention is a suction vehicle comprising a receiver tank for collecting materials to be collected and a water-sealed pump for generating airflow by pressurizing or depressurizing the air inside the receiver tank, wherein a pipe that can communicate with the receiver tank is connected to the suction port of the water-sealed pump, and a water supply pipe having a water inlet that can draw water from the outside is connected to the pipe.

[0007] With the above configuration, since the water supply piping is connected to the piping on the suction side of the water-seal pump, water can be drawn in by the suction force of the water-seal pump, allowing for efficient water supply to the water-seal pump and enabling the supply of a large amount of water to the water-seal pump in a short time. Because the connection point of the water supply piping is not on the pressurized side of the water-seal pump, the exhaust, which becomes high-temperature compressed air due to the operation of the water-seal pump, does not spray out from the water inlet, allowing for safe water supply to the water-seal pump even during operation, and eliminating the need to interrupt work even if the water level decreases due to evaporation caused by the operation of the water-seal pump.

[0008] In the suction vehicle with the above configuration, it is preferable that a filtration device is provided in the middle of the water supply piping.

[0009] With the above configuration, even if the water is not purified, it is possible to use water from nearby water tanks or rivers, for example, at the work site, thus offering greater flexibility in water supply locations and superior convenience.

[0010] In the suction vehicle having the above configuration, it is preferable that a water supply device is further provided, and that the water supply device can be connected to the water inlet of the water supply piping.

[0011] According to the above configuration, water can be drawn from locations without special water intake facilities, such as rivers, offering greater flexibility in water supply locations and superior convenience. Furthermore, while water-seal pumps generally cannot generate suction without a water seal at startup, by using a submersible pump to pressurize water drawn from, for example, a river, the suction power of the water-seal pump can be generated in a short time, allowing work to begin. [Effects of the Invention]

[0012] According to the suction vehicle of the present invention, since the water supply piping is connected to the piping on the suction side of the water-seal pump, water can be drawn in by the suction force of the water-seal pump, allowing for efficient water supply to the water-seal pump. Because the connection point of the water supply piping is not the pressurized side piping of the water-seal pump, water can be supplied to the water-seal pump safely even during operation, and work does not have to be interrupted even if the water level decreases due to evaporation. [Brief explanation of the drawing]

[0013] [Figure 1] This is a side view showing a schematic configuration of a suction vehicle according to an embodiment of the present invention. [Figure 2] This is a plan view of the suction vehicle. [Figure 3] This is a diagram of the air piping for a suction device mounted on a suction vehicle, showing the airflow during suction. [Figure 4] Figure 3 shows the air flow during pressurization in the air piping diagram. [Figure 5] This is a schematic diagram illustrating the operation of a water-sealed pump installed in a suction device. [Figure 6] This is a side view showing the control panel installed on the suction vehicle. [Figure 7] This is a perspective view of the water supply piping connected to the suction port of a water-sealed pump. [Figure 8] Figure 7 is a rear view of the water supply piping. [Modes for carrying out the invention]

[0014] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0015] FIG. 1 and FIG. 2 show a suction vehicle 2 according to an embodiment of the present invention. A suction device 1 is provided on a sub-frame 4 on a vehicle body 3 of the suction vehicle 2. Specifically, a receiver tank 5 for collecting objects to be collected such as sludge, earth and sand, waste liquid, etc. is mounted at the rear part of the sub-frame 4.

[0016] The receiver tank 5 has, for example, a tank body 5a in the shape of a circular cross-section container having an opening at the rear end, and a tail gate 5c for opening and closing the rear end opening. The tail gate 5c is pivotally supported, for example, at the upper rear end of the tank body 5a via a hinge pin 5b so as to be rotatable. An opening and closing cylinder 5d is provided between the tank body 5a and the tail gate 5c, and by expanding and contracting the opening and closing cylinder 5d, the tail gate 5c can open and close the rear end opening of the tank body 5a.

[0017] At the lower part of the tail gate 5c, a suction port 8 with an on-off valve serving as a suction port for the object to be collected and a discharge port 9 with an on-off valve serving as a discharge port for the object to be collected are provided. The receiver tank 5 is pivotally supported with respect to the sub-frame 4 via a tilting shaft 10 provided behind the sub-frame 4. That is, a tilting cylinder 11 is provided between the sub-frame 4 and the receiver tank 5. By expanding and contracting the tilting cylinder 11, the receiver tank 5 can stand up and rotate or fall down and rotate around the tilting shaft 10.

[0018] On the sub-frame 4 between the receiver tank 5 and the cab 13, a water-sealed pump 25 as a vacuum pump for pressurizing and depressurizing the air in the receiver tank 5 and generating a flow of air is provided. The water-sealed pump 25 is rotationally driven by the driving force of an engine (not shown) connected via the drive shaft of the PTO of the suction vehicle 2. Pipes, various valves, an operation panel 15, etc. connected to the water-sealed pump 25 are arranged around the water-sealed pump 25.

[0019] Specifically, the water-sealed pump 25 has a structure as shown in FIG. 5. In the water-sealed pump 25, when water is put into the cylindrical casing 251 and the impeller 252 eccentric to the central axis of the casing 251 is rotated, the sealed water 254 flows so as to be pressed against the inner cylindrical wall of the casing 251 by centrifugal force to form a water reflux 253, and a space with a crescent cross-section is formed in its inner peripheral part. In this space, the independent air chamber formed by two adjacent blades and the inner surface of the water reflux 253 repeats expansion and contraction as the impeller 252 rotates. Therefore, if the suction port 25a and the discharge port 25b are opened at appropriate positions on the side surface of this air chamber, it becomes possible to continuously rotate the reciprocating suction machine using the water reflux 253 instead of the piston. That is, the water-sealed pump 25 is a vacuum pump that generates a negative pressure by rotating water in a circular shape. Thus, in the water-sealed pump 25, since water forms part of the pump, it has many advantages such as excellent quietness, no metal contact, and no need for oil. Further, since there is a large gap between the casing 251 and the impeller 252, foreign matter is difficult to get caught, and furthermore, since the pump does not operate when the water runs out, there is an advantage that it is easy for the operator to notice idling and seizure is less likely to occur.

[0020] As shown in FIGS. 3 and 4, the suction device 1 includes the above-described receiver tank 5 as a primary catcher, a secondary catcher 20 composed of a cyclone type dust collector, a tertiary catcher 21, a quaternary catcher 22 composed of a gas-liquid separator and a water tank, the above-described water-sealed pump 25, etc., and these devices are connected via a receiver tank pressure reduction pipe 7 made of, for example, metal round steel pipe. The receiver tank 5 is connected to the secondary catcher 20 by the first pipe 7a. Further, the secondary catcher 20 is connected to the tertiary catcher 21 by the second pipe 7b. In this embodiment, the tertiary catcher 21 and the quaternary catcher 22 are provided integrally.

[0021] The water-sealed pump 25, tertiary catcher 21, quaternary catcher 22, and integrated silencer 23 are connected to an air-switching four-way valve 24 via piping. Specifically, the water-sealed pump 25 has a suction port 25a and a discharge port 25b. The tertiary catcher 21 and the four-way valve 24 are connected by a third pipe 7c. The suction port 25a of the water-sealed pump 25 and the four-way valve 24 are connected by a fourth pipe 7d. The quaternary catcher 22 and the four-way valve 24 are connected by a fifth pipe 7e. The integrated silencer 23 and the four-way valve 24 are connected by a sixth pipe 7f. The discharge port 25b of the water-sealed pump 25 is connected to the quaternary catcher 22 by a seventh pipe 7g.

[0022] When the suction device 1 sucks and collects the material to be collected into the receiver tank 5, the reduced pressure and airflow within the receiver tank 5 draw the material into the receiver tank 5 from the outside through a suction hose (not shown) connected to the suction port 8. On the other hand, when the suction device 1 discharges the material to be collected from the receiver tank 5 to, for example, a sludge treatment plant, the air inside the receiver tank 5 is pressurized, and the material to be collected from the receiver tank 5 is discharged to the outside through a discharge hose (not shown) connected to the discharge port 9. It is also possible to discharge the material to be collected from the receiver tank 5 by opening the tailgate 5c and rotating the receiver tank 5 upright.

[0023] As shown in Figure 1, the operation panel 15 is installed on one side of the suction vehicle 2 in the left-right direction. In this embodiment, the operation panel 15 is provided on the left side of the suction vehicle 2. As shown in Figure 6, the operation panel 15 is equipped with a control device (control unit) 6 that controls the operation of the water-sealed pump 25 and the four-way valve 24 in the suction device 1. The operation panel 15 is provided with operation switches for switching the switching state of the four-way valve 24 to one of three modes: suction state (suction mode), neutral state (neutral mode), and pressurized state (pressurized mode). These switches include a suction mode button 15a, a neutral mode button 15b, and a pressurized mode button 15c. An accelerator knob 15d is also provided for adjusting the rotation speed of the water-sealed pump 25. Furthermore, the suction mode button 15a is equipped with a suction indicator lamp 40a to indicate that the four-way valve 24 is switched to suction mode. Similarly, the pressurized mode button 15c is equipped with a pressurized indicator lamp 40c to indicate that the four-way valve 24 is switched to pressurized mode. The control device 6 may also be installed inside the driver's cab 13.

[0024] Furthermore, the control panel 15 is equipped with an operating lever 27 for operating the opening / closing cylinder 5d and the tilting cylinder 11. By operating the operating lever 27, a switching operation of a hydraulic circuit (not shown) is performed, causing the opening / closing cylinder 5d to retract or extend, and the tilting cylinder 11 to retract or extend. In this embodiment, it is possible to operate the opening / closing cylinder 5d and the tilting cylinder 11 with a single operating lever 27. The operating lever 27 can be operated in the left / right and up / down directions, for example, around the position shown in the figure. For example, when the operating lever 27 is operated upward, the receiver tank 5 stands upright (dump raised) due to the extension operation of the tilting cylinder 11. When the operating lever 27 is operated downward, the receiver tank 5 tumbles down (dump lowered) due to the retraction operation of the tilting cylinder 11. Also, when the operating lever 27 is operated to the right, the tailgate 5c is opened (gate opened) due to the extension operation of the opening / closing cylinder 5d. When the operating lever 27 is operated to the left, the tailgate 5c is closed (gate closed) by the contraction of the opening / closing cylinder 5d. Alternatively, the operation of the opening / closing cylinder 5d and the operation of the tilting cylinder 11 may be performed using separate operating tools.

[0025] The four-way valve 24 is provided in the suction device 1 to switch the airflow from the water-sealed pump 25. Specifically, the four-way valve 24 is used to switch between three modes: a suction mode in which negative pressure is created inside the receiver tank 5 to draw the object to be sucked into the receiver tank 5; a pressurizing mode in which the inside of the receiver tank 5 is pressurized to discharge the object to be sucked out of the receiver tank 5; and a neutral positive mode in which the water-sealed pump 25 is driven while the receiver tank 5 is not pressurized or depressurized.

[0026] Figure 3 shows the airflow during suction by the suction device 1. As shown in Figure 3, during suction, ports 24a and 24b of the four-way valve 24 are connected, and ports 24c and 24d are connected. Ports 24a and 24b are separated from ports 24c and 24d by a valve body. As a result, air flows simultaneously from port 24a to port 24b, and from port 24d to port 24c. Consequently, the air sucked from the receiver tank 5 passes through the secondary catcher 20 and tertiary catcher 21, through the four-way valve 24, through the ejector 30, is drawn in by the water-sealed pump 25, passes through the quaternary catcher 22, and again through the four-way valve 24 before being exhausted from the integrated silencer 23.

[0027] Figure 4 shows the airflow when the suction device 1 is pressurized. As shown in Figure 4, when pressurized, the position of the valve body of the four-way valve 24 is switched, connecting ports 24a and 24d, and ports 24b and 24c. Ports 24a and 24d are separated from ports 24b and 24c by the valve body. As a result, air flows simultaneously from port 24a to port 24d, and from port 24b to port 24c. As a result, the air drawn in from the integrated silencer 23 passes through the four-way valve 24, is drawn into the water-sealed pump 25, passes through the quaternary catcher 22, passes through the four-way valve 24 again, and pressurizes the receiver tank 5 through the tertiary catcher 21 and the secondary catcher 20.

[0028] Furthermore, when the valve is neutral, the valve body of the four-way valve 24 remains stationary in a position intermediate between the suction and pressurization positions described above. The position of the valve body of the four-way valve 24 is changed by an actuator integrally attached to the four-way valve 24.

[0029] In this embodiment, a pipe (receiver tank pressure / vacuum pipe) 7 that can communicate with the receiver tank 5 is connected to the suction port 25a of the water-sealed pump 25, and a water supply pipe 31 having a water inlet 32 ​​that can draw water from the outside is connected to the receiver tank pressure / vacuum pipe 7. This point will be explained with reference to Figures 2, 3, 4, 7, 8, etc.

[0030] As described above, a four-way valve 24 is connected to the suction port 25a of the water-sealed pump 25 via the fourth pipe 7d. During suction, as shown in Figure 3, the suction port 25a of the water-sealed pump 25 is connected to the receiver tank 5 via the fourth pipe 7d, the four-way valve 24, the third pipe 7c, the second pipe 7b, and the first pipe 7a. When the water-sealed pump 25 is driven, air in the receiver tank 5 is drawn in and passed through the secondary catcher 20, the tertiary catcher 21, and the four-way valve 24 before being drawn into the suction port 25a of the water-sealed pump 25. Then, air is discharged from the discharge port 25b of the water-sealed pump 25 and exhausted from the integrated silencer 23 through the quaternary catcher 22 and the four-way valve 24.

[0031] Furthermore, as described above, when pressurized, as shown in Figure 4, the suction port 25a of the water-sealed pump 25 is connected to the integrated silencer 23 via the fourth pipe 7d, the four-way valve 24, and the sixth pipe 7f. When the water-sealed pump 25 is driven, external air is drawn in from the integrated silencer 23, passes through the four-way valve 24, and is drawn into the suction port 25a of the water-sealed pump 25. Then, air is discharged from the discharge port 25b of the water-sealed pump 25 and sent to the receiver tank 5 through the quaternary catcher 22, the four-way valve 24, the tertiary catcher 21, and the secondary catcher 20, pressurizing the receiver tank 5.

[0032] The water supply pipe 31 is connected to a fourth pipe 7d located between the suction port 25a of the water-seal pump 25 and the four-way valve 24. As shown in Figures 7 and 8, a water inlet 32 ​​is provided at the end of the water supply pipe 31, allowing water to be drawn in from the outside. A strainer 33, which serves as a filtration device, is also provided in the middle of the water supply pipe 31. In this embodiment, as shown in Figures 2 and 7, the water supply pipe 31 is positioned adjacent to the rear side of the fourth catcher 22, with the water inlet 32 ​​facing the right side of the vehicle body. The water supply pipe 31 is fixed to the subframe 4 (see Figure 1) by a stay 34.

[0033] By drawing water from the water inlet 32 ​​of the water supply piping 31, it becomes possible to supply water directly to the water-seal pump 25. In this case, even if the water is not purified water from which fine debris that can cause jamming in a Roots-type blower has been removed, it is sufficient to draw water from sources such as a water tank or river containing fallen leaves and dust. The water drawn from the water inlet 32 ​​is filtered by the strainer 33 to remove larger debris that could get stuck in the gap between the casing 251 and the impeller 252, and then it can be supplied to the water-seal pump 25.

[0034] According to this embodiment, since the water supply pipe 31 is connected to the pipe on the suction port 25a side of the water-seal pump 25, water can be drawn in by the suction force of the water-seal pump 25, allowing for efficient water supply to the water-seal pump 25 and enabling the supply of a large amount of water to the water-seal pump 25 in a short time. Because the connection point of the water supply pipe 31 is not on the pressurized side of the water-seal pump 25, the exhaust, which has become high-temperature compressed air due to the operation of the water-seal pump 25, does not spray out from the water inlet 32, allowing for safe water supply to the water-seal pump 25 even during operation, and eliminating the need to interrupt work even if the amount of water decreases due to evaporation caused by the operation of the water-seal pump 25. Furthermore, since the direction of air suction and pressure supply in the piping near the water-seal pump 25 that does not pass through the four-way valve 24 does not change whether the air in the receiver tank 5 is pressurized or depressurized, water can be supplied to the water-seal pump 25 regardless of the mode of the four-way valve 25.

[0035] Furthermore, while a water-sealed pump 25 generally cannot generate suction force without a water seal at startup, in this embodiment, even if there is no water seal in the water-sealed pump 25 at startup, the water-sealed pump 25 can be driven and suction force can be generated by supplying water from the water inlet 32 ​​with an external pump, allowing work to start in a short time. In addition, in cold regions, it is necessary to drain the water seal from the water-sealed pump 25 after each work to prevent freezing, but since a large amount of water seal can be supplied to the water-sealed pump 25 in a short time when it is started up, draining in cold regions can be easily handled.

[0036] Furthermore, in cold regions, even if cold water is drawn from the water inlet 32 ​​of the water supply pipe 31, the water seal pump 25 raises the temperature, making it less likely for the water stored in the quaternary catcher 22 to freeze.

[0037] In this embodiment, since a strainer 33 is provided in the middle of the water supply piping 31, water from a nearby water tank or river can be used, for example, and it does not need to be purified water, thus offering greater flexibility in water supply locations and excellent convenience. Because the water-seal pump 25 is resistant to jamming, the strainer 33 only needs to be a minimal filtration device that can remove relatively large debris, and the water supply speed to the water-seal pump 25 can be maintained, enabling efficient water supply work.

[0038] Furthermore, by equipping the suction vehicle 2 with a submersible pump as a water supply device, and by making it possible to connect the submersible pump to the water inlet 32 ​​of the water supply piping 31, water can be drawn from places without special water intake facilities, such as rivers, providing greater flexibility in water supply locations and excellent convenience. In addition, as mentioned above, the water-sealed pump 25 cannot generate suction force without a water seal at startup, but by pressurizing water drawn from a river, for example, with the submersible pump, the suction force of the water-sealed pump 25 can be generated in a short time, allowing work to begin.

[0039] The embodiments disclosed herein are illustrative in all respects and are not intended to be restrictive. The technical scope of the present invention is not construed solely by the embodiments described above, but is defined by the claims. Furthermore, the technical scope of the present invention includes all modifications within the meaning and scope of equivalence to the claims.

[0040] The arrangement of the water supply piping 31 and the orientation of the water inlet 32 ​​described above are just examples; as long as the water supply piping 31 is connected to the piping on the suction port 25a side of the water-seal pump 25, it can be changed in various ways.

[0041] In the above embodiment, the water stored in the quaternary catcher 22 may be supplied to the water-seal pump 25. Alternatively, a separate water tank may be installed on the suction vehicle 2, and water may be supplied from the water tank to the water-seal pump 25 using the water supply piping 31.

[0042] In the above embodiment, water was drawn in and pumped from a river or the like using a submersible pump, but the water supply device may also draw water from a water storage tank. For example, a hose may be inserted into the water storage tank, and water may be supplied using a manual pump or electric suction device mounted on the suction vehicle 2. The water supply device can be connected to the water inlet 32, and the water source and power source can be changed in various ways as long as it is portable and can be mounted on the suction vehicle 2.

[0043] In the above embodiment, the suction device 1 was equipped with a secondary catcher 20 consisting of a cyclone-type dust collector, but the secondary catcher may be omitted. [Explanation of symbols]

[0044] 1 Suction device 2 Suction car 5 Receiver Tank 7. Receiver tank pressure / vacuum piping (piping) 25 Water-sealed pumps 25a Inlet 31 Water supply piping 32 Water inlet 33. Strainer (filtration device)

Claims

1. A receiver tank for collecting the materials to be collected, A suction vehicle comprising a water-sealed pump that generates an airflow by increasing or decreasing the pressure of the air inside the receiver tank, A suction vehicle characterized in that a pipe that can communicate with the receiver tank is connected to the suction port of the water-sealed pump, and a water supply pipe having a water inlet that can draw water from the outside is connected to the pipe.

2. In the suction vehicle according to claim 1, A suction vehicle characterized by having a filtration device installed in the middle of the water supply piping.

3. In the suction vehicle according to claim 1 or 2, It is further equipped with a water supply system, A suction vehicle characterized in that the water supply device can be connected to the water inlet of the water supply piping.

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