JP5183761B2 - Suction device and suction wheel - Google Patents

Description

  The present invention relates to a suction device that sucks a suction target such as sludge into a receiver tank by using a suction force of a blower, and a suction wheel equipped with the suction device.

  2. Description of the Related Art Conventionally, a suction device that sucks sludge and the like into a receiver tank using a suction force of a blower and a suction wheel equipped with this suction device are known (for example, see Patent Document 1).

  In such a blower provided in the suction device and the suction wheel, the driving load increases and the temperature rises as the degree of vacuum in the receiver tank increases. When the temperature of the blower rises to a certain temperature, the sliding part, seal part, etc. of the blower may be seized and cause a failure. For this reason, normally, the cooling water in the dust collection tank collected by the cyclone dust collector is appropriately supplied and mixed into the intake air of the blower through the cooling water supply pipe. As a result, the blower is cooled and seizure is prevented.

JP 2007-92733 A

  By the way, the dust collection tank is subjected to rust prevention treatment such as plating treatment and painting treatment. For this reason, a plating layer and a coating film peel due to secular change, which may flow into the cooling water supply pipe and close the pipe. In particular, when a throttle part such as an orifice is provided in the cooling water supply pipe, a closed state is more likely to occur. When the cooling water supply pipe is blocked, the cooling water to be supplied to the blower being driven is stagnant, so that the temperature of the blower is significantly increased and the blower may be burned.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a suction device and a suction wheel which prevent blow-in burn-in.

As means for solving the above-described problems, the suction device of the present invention is configured as follows. That is, the suction device of the present invention includes a receiver tank that recovers a recovery target, a blower for decompressing air in the receiver tank, and a cooling water supply path that supplies cooling water to the blower. in the cooling water supply passage, Rutotomoni detachable is provided filter capable of filtering elements, the downstream end of the cooling water supply passage, an orifice is provided, the cooling water from the cooling water supply passage The blower is cooled by being sucked into the blower inlet together with the suction air of the blower .

  According to the suction device having such a configuration, the filtered matter filtered by the filter element can be removed periodically or at a specific timing. As a result, the cooling water supply path can be prevented from being blocked by foreign matter, and the cooling water supplied to the blower side can be prevented from stagnation due to the blocking of the cooling water supply path. It is possible to prevent burn-in of the material.

  The suction wheel of the present invention is equipped with a suction device having any one of the above-described configurations, and exhibits the above-described effects.

  According to the suction device and the suction wheel of the present invention, it is possible to prevent the cooling water supply path from being blocked by foreign matter, and the cooling water supplied to the blower side is stagnated when the cooling water supply path is blocked. It is possible to prevent this, and it is possible to prevent the blower from being seized.

It is a left view which shows the suction wheel which mounts the suction device which concerns on embodiment of this invention. It is a top view showing a suction wheel carrying a suction device concerning an embodiment of the invention. It is a rear view which shows the suction wheel carrying the suction device which concerns on embodiment of this invention. It is a piping diagram of the suction device concerning an embodiment of the invention. It is the figure which showed an example of the Y type strainer. It is a figure which shows a part of sequence circuit of the suction apparatus which concerns on embodiment of this invention.

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

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

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

  The receiver tank 5 includes a main body 6 having a rear end opening and a tailgate 7 for opening and closing the rear end opening. The tailgate 7 is pivotally supported on the upper rear end portion of the main body 6 via a hinge pin 8 so as to be rotatable. Further, an opening / closing cylinder 9 is disposed between the main body 6 and the tailgate 7. The tailgate 7 opens and closes the rear end opening of the main body 6 by expanding and contracting the open / close cylinder 9.

  A tank pressure increasing / decreasing pipe 41 is connected to the upper part of the main body 6 of the receiver tank 5. On the lower side of the tailgate 7, there are provided a suction port 11 with an opening / closing valve that serves as a suction port for the collection object and a discharge port 12 with an opening / closing valve that serves as a discharge port for the collection object.

  The receiver tank 5 is pivotally supported via a tilt pin 14 with respect to the subframe 4 (vehicle body), and a tilt cylinder 15 is disposed between the subframe 4 and the receiver tank 5. By operating the tilting cylinder 15 to extend and contract, the receiver tank 5 rises or turns around the tilting pin 14. In addition, in order to respond | correspond to the rotation operation | movement of the said receiver tank 5, the part is comprised with flexible materials, such as a flexible hose, in the tank pressurization / decompression piping 41.

  When the suction wheel 2 sucks and collects an object to be collected in the receiver tank 5, the pressure in the receiver tank 5 is reduced, and the suction tank 2 enters the receiver tank 5 from the outside through a suction hose (not shown) connected to the suction port 11 with an open / close valve. Aspirate collection object.

  On the other hand, when the suction vehicle 2 discharges the collection object in the receiver tank 5 to a predetermined place (for example, a sludge treatment plant), the air in the receiver tank 5 is pressurized and connected to the discharge port 12 with the on-off valve. The collection object in the receiver tank 5 is discharged to the outside through the discharge hose not to be used. Further, the collection target in the receiver tank 5 can be discharged by opening the tailgate 7 and rotating the receiver tank 5 upright.

  Between the cab 16 and the receiver tank 5, a blower 40, a valve, and other pipes and devices for increasing and reducing the pressure in the receiver tank 5 are mounted. The blower 40 is rotationally driven by a driving force of a power take-out device (PTO) (not shown) of the suction wheel 2. Specifically, the blower 40 is configured to be rotationally driven via a V pulley, a V belt, and the like (not shown) with the propeller shaft 17 that is linked to the PTO of the suction wheel 2.

  As shown in FIG. 1, the suction wheel 2 is equipped with an operation panel 19 in which meters, switches, operation levers, and the like are concentrated. The operation panel 19 is provided with a temperature warning buzzer BZ, a temperature warning lamp 21, a panel lamp 22 as an operation panel illumination, a tachometer lamp 23, and the like, which will be described later.

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

  The receiver tank 5 is connected to a tank pressure increasing / decreasing pipe 41 for supplying or sucking air in order to increase or decrease the pressure in the receiver tank 5. The tank pressurizing / depressurizing pipe 41 branches into a suction pipe 42 and a pressurizing pipe 43. A valve V <b> 1 that opens and closes the pipe line is provided in the middle of the suction pipe 42, and a valve V <b> 2 that opens and closes the pipe line is also provided in the middle position of the pressurizing pipe 43.

  The suction pipe 42 is connected to the suction port 44 a of the upstream catcher (cyclone dust collector) 44 at the downstream end. The discharge port 44 b of the upstream catcher 44 is communicated with the suction port 40 a of the blower 40 via a pipe 47. A silencer 49 is interposed in the middle of the pipe 47.

  The discharge port 40 b of the blower 40 is connected to the import 51 a of the silencer 51 through the discharge side pipe 50.

  A first out port 51 b of the silencer 51 is connected to a suction port 54 a of a downstream catcher (cyclone dust collector) 54 via a pipe 52. A valve V <b> 3 that opens and closes the pipe line is interposed in the middle of the pipe 52. A pressurizing pipe 43 is connected between the first out port 51b of the silencer 51 and the valve V3. A relief valve 55 is provided at the second out port 51 c of the silencer 51.

  The atmospheric bypass port 54 b of the downstream catcher 54 is communicated with a midway position of the pipe 47 through the pipe 58. And in two places in the middle of the pipe 58, bypass pipes 59 are provided to bypass these two places.

  A load release valve V4 and a blower protection valve V7, which can connect the suction port 40a of the blower 40 to the atmosphere, are interposed in a portion where the pipe 58 and the bypass pipe 59 are arranged in parallel. The load release valve V4 is manually operated, while the blower protection valve V7 is automatically operated.

  In this embodiment, the blower protection valve V7 and the load release valve V4 are provided separately in parallel. However, the load release valve V4 can be automatically operated, and the same function as the blower protection valve V7 is provided to protect the blower. The valve V7 may be abolished.

  When the blower protection valve V7 is opened during the decompression of the receiver tank 5, the blower protection valve V7 opens the air flow path between the receiver tank 5 and the blower 40 to the atmosphere. This blower protection valve V7 can be opened and closed by an actuator. In the present embodiment, an air cylinder drive butterfly valve that opens and closes the valve body by a reciprocating motion of the pneumatic cylinder V7a is employed. The pneumatic cylinder V7a is controlled by a two-position electromagnetic control valve VV7 as shown in the figure, for example. When the solenoid SOL2 is demagnetized, the control valve VV7 supplies the air pressure of the air tank S, which is an air pressure source, to the closed side port P1 of the pneumatic cylinder V7a, and closes the blower protection valve V7. When the solenoid SO2 is energized, the air pressure of the air tank S is supplied to the open port P2 of the pneumatic cylinder V7a to open the blower protection valve V7. As the blower protection valve V7, a valve (for example, an electric butterfly valve) that opens and closes a valve body by the rotational power of an electric motor can be employed.

  The upstream catcher 44 and the downstream catcher 54 are integrally mounted on the dust collection tank 60. A partition wall 61 is provided in the dust collection tank 60, and the partition wall 61 separately collects dust collection, water droplets, and the like collected by the upstream catcher 44 and the downstream catcher 54. Hereinafter, the upstream side of the dust collection tank 60 with the partition wall 61 as a boundary is referred to as a dust collection tank upstream side 60a, and the downstream side of the dust collection tank 60 is referred to as a dust collection tank downstream side 60b.

  The suction port 40 a of the blower 40 and the dust collection tank downstream side 60 b are communicated with each other by a cooling water supply pipe 62. A valve V5 that opens and closes the pipe line is interposed in the middle of the cooling water supply pipe 62. In a state where the valve V5 is opened, the cooling water stored in the dust collection tank downstream side 60b becomes mist through the orifice provided at the downstream end of the pipe 62 and enters the suction port 40a of the blower 40. Supplied.

  In addition, the cooling water supply pipe 62 is connected to a joining pipe 63 that communicates with the water supply tank 57 at an intermediate position. A valve V <b> 6 that opens and closes the pipe line is also provided in the middle position of the merge pipe 63.

  On the discharge side of the blower 40, in order to detect the temperature of the blower 40 (temperature that changes according to the temperature of the blower 40), a thermo switch (temperature sensor) SW1 that detects the discharge air temperature of the blower 40 is provided. Yes. The thermo switch SW1 performs an on / off operation when it detects that the discharge air temperature of the blower 40 has reached the set temperature.

  A filter 65 for filtering foreign matter is interposed in the middle of the cooling water supply pipe 62 (on the downstream side from the connection with the junction pipe 63). As the filter 65, for example, a Y-type strainer 65 as shown in FIG. 5 is employed. In this Y-type strainer 65, a filter element 65a for filtering foreign matter flowing through the cooling water flow path can be integrally attached to and detached from the bolt 65b. The filter element 65a and the bolt 65b are removed from the Y-type piping main body 65c and cleaned. By doing so, the filtered foreign matter (filtrate) can be discharged out of the Y-type piping main body 65c (cooling water supply flow path). Further, a part of the filter 65 is constituted by a transparent window member 65d so that the foreign matter filtered by the internal filter element 65a can be monitored from the outside.

  Further, on the downstream side of the filter 65, the intermediate position of the pipe 62 is made of a transparent member such as the site flow 66 so that the flow rate of the cooling water in the cooling water supply pipe 62 (cooling water supply path) can be monitored. It is configured.

  Thus, since the cooling water supply pipe 62 is provided with the filter 65 and the site flow 66, the filtered foreign matter in the filter 65 is monitored from the outside periodically or at a necessary timing, In addition, by monitoring the flow rate of the cooling water in the site flow 66, it is possible to prevent the cooling water supplied to the blower 40 side from stagnation due to the cooling water supply pipe 62 being blocked.

  FIG. 6 shows a part of the sequence circuit C that functions as the control means of the suction device 1. In this figure, PTOSW is an on / off switch of the power take-out device, and SOL1 is a solenoid of an on / off control valve of the power take-out device. R1 to R2 are relays, and corresponding relay contacts r1 to r2 are arranged, respectively.

  SW1 is a thermo switch, SW2 is an on / off switch for the panel lamp 22 and the tachometer lamp 23, 24 is a tachometer, and BZ is a temperature alarm buzzer. Reference numeral 21 denotes a temperature warning lamp, and F1 to F5 are fuses. SOL2 is a solenoid for the control valve VV7 of the blower protection valve V7. Note that the power supply of the sequence circuit is taken from the vehicle-side battery BT.

[Suction of collected objects]
Hereinafter, a case will be described in which the air in the receiver tank 5 is decompressed and the collection object is sucked into the receiver tank 5 by the piping configuration and the sequence circuit configuration.

  In this case, first, the operator opens the valve V1, the valve V3, and the valve V5, and closes the valve V2 and the valve (load release valve) V4. The valve V6 is opened when there is little cooling water stored in the dust collection tank downstream side 60b.

  At this time, the blower protection valve V7 is in a closed state. That is, since the discharge air temperature of the blower 40 is lower than the operating temperature (for example, 110 ° C.) of the thermo switch SW1, the thermo switch SW1 is in the off state. Accordingly, the relay R2 is in a demagnetized state, the two relay contacts r2 and r2 are in an open state, and the solenoid SOL2 of the control valve VV7 of the blower protection valve V7 is in a demagnetization state, so that the blower protection valve V7 is closed. It is in a state.

  When PTOSW is switched on by an operator or the like and the blower 40 is driven by the rotational driving force of the engine of the suction wheel 2 via the power take-off device, the relay R1 is excited and the relay contact r1 is closed. The tachometer 24 is activated. At this time, the temperature of the air discharged from the blower 40 gradually increases, but does not reach the operating temperature (for example, 110 ° C.) of the thermo switch SW1, the thermo switch SW1 remains in the off state, and the relay R2 continues in the demagnetized state. . Therefore, the two relay contacts r2 and r2 continue to be opened, the solenoid SOL2 of the control valve VV7 of the blower protection valve V7 continues to be demagnetized, and the blower protection valve V7 continues to be closed.

  Driving the blower 40 causes the air in the receiver tank 5 to be sucked into the upstream catcher 44 through the tank pressure increasing / decreasing pipe 41 and the suction pipe 42 as indicated by solid arrows along the pipe in FIG. 4.

  The upstream catcher 44 includes a processing chamber 44c including a cylindrical cylindrical chamber and a substantially conical conical chamber continuous below the cylindrical chamber. When air containing dust or the like is sucked into the upstream catcher 44, a spiral airflow is generated along the inner wall surface of the processing chamber 44c, and most of the dust or the like falls downward from the lower end opening of the conical chamber to collect the dust. Dust collection or the like is collected and dissolved in the water stored in the tank upstream side 60a. On the other hand, the air from which dust or the like has been separated rises in the center of the spiral airflow and is discharged from the processing chamber 44c to above the upstream catcher 44.

  The air discharged upward from the upstream catcher 44 is sucked into the suction port 40 a of the blower 40 together with the mist-like cooling water supplied from the cooling water supply pipe 62 (silencer 49) through the pipe 47 and the silencer 49. From the discharge port 40b. The air discharged from the discharge port 40 b of the blower 40 is discharged to the downstream catcher 54 through the discharge side pipe 50, the silencer 51, and the pipe 52.

  The downstream catcher 54 also includes a processing chamber 54c similar to the upstream catcher 44. When air containing dust, cooling water, etc. is discharged to the downstream catcher 54, the downstream catcher 54 spirals along the inner wall surface of the processing chamber 54c. An airflow is generated, and most of the dust, cooling water, etc. fall downward from the lower end opening of the conical chamber and are collected in the dust collection tank downstream side 60b. On the other hand, the air separated from the dust or the like in the downstream catcher 54 rises in the center of the spiral air flow and is discharged to the atmosphere from a discharge cylinder 54d provided on the upper side in the processing chamber 54c.

  As described above, when the air in the receiver tank 5 is discharged to the atmosphere and the air in the tank 5 is decompressed, a large load is applied to the blower 40, so the temperature of the blower 40 rises to some extent. Since the cooling water is supplied to the blower 40 through the cooling water supply pipe 62, the temperature of the blower 40 is kept below a certain level unless the cooling water supply is delayed, and the blower 40 operates normally without being burned.

  On the other hand, if the cooling water supply pipe 62 is blocked by foreign matter and the blower 40 continues to be driven while the cooling water supply is stagnant, the temperature of the blower 40 immediately rises. At this time, the discharge air temperature of the blower 40 also rises. When the discharge air temperature of the blower 40 reaches the operating temperature (110 ° C.) of the thermo switch SW1, the thermo switch SW1 is turned on, the relay R2 is excited, and the two relay contacts r2 and r2 are closed. Then, the solenoid SOL2 is excited and the blower protection valve V7 is opened. Further, when the relay contacts r2 and r2 are closed, the temperature alarm buzzer BZ sounds and the temperature warning lamp 21 is turned on to notify the operator of the temperature abnormality of the blower 40.

  As described above, when the blower protection valve V7 is opened when the temperature of the blower 40 is increased, air close to the atmospheric pressure is introduced into the suction port 40a of the blower 40 through the pipe 58. The temperature of the blower 40 is rapidly lowered by the air cooling effect caused by a large amount of air, and seizure of the blower 40 is prevented.

  Next, the case where the inside of the receiver tank 5 is pressurized will be described.

  First, the operator closes the valve V1 and the valve V3, and opens the valve V2, the valve (load release valve) V4, and the valve V5. The valve V6 is opened when there is little cooling water stored in the dust collection tank downstream side 60b. Since the blower protection valve V7 is in the OFF state, the blower protection valve V7 is closed as described above.

  After the valve operation, the blower 40 is rotationally driven by the rotational driving force of the engine of the suction wheel 2. As a result, as indicated by a broken line arrow in FIG. 4, air is sucked from the exhaust tube 54 d of the downstream catcher 54, and air is sucked into the suction port 40 a of the blower 40 through the air bypass port 54 b, the pipe 58 and the pipe 47. And discharged from the discharge port 40b of the blower 40. The air discharged from the discharge port 40b is supplied into the receiver tank 5 through the discharge side pipe 50, the silencer 51, the pressurizing pipe 43, and the tank pressure increasing / decreasing pipe 41, and the air in the receiver tank 5 is pressurized. At this time, by opening a discharge valve provided at the rear bottom of the receiver tank 5, it is possible to discharge the collection object such as sludge accumulated in the receiver tank 5 to the outside.

  The present invention is applicable to a suction device that sucks a suction target such as sludge into a receiver tank using a blower, and a suction wheel equipped with the suction device.

1 Suction Device 2 Suction Wheel 5 Receiver Tank 40 Blower 62 Cooling Water Supply Pipe (Cooling Water Supply Channel)
65 Filter 65a Filter element (filter element)
SW1 Thermo switch (temperature sensor, temperature detection means)
C Sequence circuit (control means)
V7 Blower protection valve (Blower temperature lowering means)

Claims (2)

A receiver tank for collecting the collection object;
A blower for decompressing the air in the receiver tank;
A cooling water supply path for supplying cooling water to the blower;
A suction device comprising:
Wherein the cooling water supply passage, Rutotomoni is detachable capable filter of the filter element is provided, at the downstream end of the cooling water supply passage, an orifice is provided,
The suction device is characterized in that cooling water from the cooling water supply path is sucked into an inlet of the blower together with intake air of the blower, thereby cooling the blower. A suction wheel equipped with the suction device according to claim 1 .

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