JPH0619667Y2 - Dust removal water discharge prevention device for tank truck dust removal device - Google Patents

Description

Detailed Description of the Invention A. Purpose of the Invention (1) Field of Industrial Use The present invention is applied to a tank truck such as a sludge truck, which is installed in a dust removal device installed in an air suction conduit in an air circuit during discharging work of suctioned matter clogged in a suction pipe. The present invention relates to a dust removal water discharge prevention device of a dust removal device in a tank car that prevents water from flowing back to the tank side.

(2) Conventional technology Conventionally, a closed tank is mounted on a vehicle body frame, an air circuit connecting a blower and a suction pipe are connected to the tank, and the inside of the tank is kept at a negative pressure by driving the blower. A tank truck is known in which suctioned substances such as sludge are sucked and stored in the tank through the suction pipe (see Japanese Utility Model Publication No. 52-9685).

(3) Problem to be Solved by the Invention By the way, in the tank car, the suction pipe may be clogged in the suction pipe during the suction work of the suction tank such as sludge in the tank. Then, the negative pressure in the tank rises, the blower becomes overloaded and heats up, and the blower is adversely affected.
It is necessary to open the load release valve to reduce the load on the blower. At this time, due to the high negative pressure in the tank, a large amount of water in the dust removing device connected to the air suction conduit flows back to the tank side and the water in the device is lost, and the dust removing device is replenished with water. I have to do it. However, there are many cases where water cannot be procured at the work site. If the suction operation is continued without knowing that there is no water in the dust removing device, not only the dust removing function of the dust removing device is lost but also the blower is overheated.

The present invention has been made in view of such circumstances, and in a tank car capable of solving the above-mentioned problems by an extremely simple structure in which a check valve is only provided in an air suction conduit in an air circuit. An object of the present invention is to provide a dust removal water discharge prevention device for a dust removal device.

B. Configuration of the Invention (1) Means for Solving the Problems To achieve the above object, according to the present invention, a closed tank is mounted on a vehicle body frame, and an air circuit and a suction pipe to which a blower is connected are installed in the tank. In the tank car, which is connected to hold the inside of the tank at a negative pressure by driving the blower and sucks and holds suctioned substances such as sludge in the tank through the suction pipe, the air circuit includes: The air extraction pipe, the air suction pipe and the air discharge pipe connected to the suction port and the discharge port of the blower, respectively, and the air discharge pipe opened to the atmosphere, and the air extraction pipe to four ports. A pipe, an air suction conduit, an air discharge conduit, and an atmosphere open conduit, respectively, and a four-way valve that selectively communicates the air intake conduit and the air discharge conduit with the air extraction pipe. Wherein the air inlet conduit, a dust remover and the check valve are connected in series, it is further connected unloading valves downstream from them.

(2) Operation According to the above configuration, when the suction pipe is clogged with suction substances and the tank is in a high negative pressure state, when the load release valve is opened to reduce the load on the blower, the air is released. Water in the dust remover connected to the air intake conduit of the circuit will not flow back to the tank side.

(3) Example Hereinafter, a first example in which the device of the present invention is applied to a sludge truck will be described with reference to FIGS.

FIG. 1 shows a side view of a sludge truck equipped with the device of the present invention, and FIG. 2 shows a plan view thereof. In these figures, on the body frame F of the sludge truck Vh, the front thereof is shown. A drive unit D and auxiliary machines A are installed in the section, and a sealed sludge tank T is installed in the rear section.

The drive unit D includes an engine E and a roots blower B driven by the engine E, and the auxiliary machines A are connected to an air circuit CA connected to the roots blower B. Secondary to fourth order dust removing devices C _{2 to} C _4, etc. Is.

A lower end of the rear part of the sludge tank T is hinged to a vehicle body frame F via a bracket 2 fixed thereto so that the sludge tank T can be tilted rearward with a hinge shaft 1, and hinge connections 4 are provided on both left and right outer sides of the vehicle body frame F. The tip ends of the piston rods of the paired dump cylinders 3 and 3 are pin-connected 6 and 6 to brackets 5 and 5 fixed to the left and right sides of the sludge tank T, respectively. Therefore, the sludge tank T can be tilted backward around the hinge shaft 1 by the extension operation of the dump cylinders 3, 3. Further, on the rear wall of the sludge tank T, the discharge port 7
The upper end of the rear lid 8 that can open and close the discharge port 7 is hinged to the rear portion of the upper wall of the sludge tank T by a hinge pin 9. On the left and right sides of the sludge tank T, the base ends of a pair of open / close cylinders 10, 10 are respectively pin-connected 11, 11 via the brackets 5, 5, and the piston rod tips of the open / close cylinders 10, 10 are the rear lids. Pin connections 12 and 12 are provided on both sides of the upper part of the pin 8. As described above, the sludge tank T is tilted, and the pair of open / close cylinders 10, 1
When 0 is extended, the rear lid 8 can be swung around the hinge pin 9 to open the discharge port 7, and the sludge in the sludge tank T can be discharged.

A sludge suction pipe 14 having a suction valve 13 and a discharge pipe 17 having a discharge valve 16 are connected to a lower portion of the rear lid 8, a suction hose 15 is connected to the sludge suction pipe 14, and the discharge pipe is A discharge hose 18 is connected to 17.

An air circuit CA for maintaining a negative pressure in the sludge tank T is connected to the sludge tank T in order to suck the sludge into the sludge tank T through the sludge suction pipe 14. Next, the structure of the air circuit CA will be described.

FIG. 3 shows a schematic system diagram of the air circuit CA.

An air outlet 21 provided with a float valve 20 is opened in the front portion of the upper wall of the sludge tank T, and the float valve 20 is closed as usual when the sludge water in the sludge tank T reaches a predetermined water level. It has become. At the air outlet 21,
The air extraction pipe 22 is connected through the primary dust remover C _{1 including a} filter. A secondary dust removing device C ₂ is provided in the middle of the air extraction pipe 22.

The open end of the air extraction pipe 22 is connected to one port P of the four-way valve V.
Connected to ₁ . Also, the other three ports P of the four-way valve
₂ , P ₃ and P ₄ are connected to an air suction conduit 25 communicating with the suction opening 23 of the roots blower B, an air discharge conduit 26 communicating with the discharge opening 24 of the blower B, and an atmosphere opening conduit 27, respectively. Has been done. A third dust removing device C ₃ is provided in the middle of the air suction conduit 25, and a fourth dust removing device C ₄ having a silencer 28 is connected to the end of the atmosphere opening conduit 27.

The second to fourth dust removers C _{2 to} C ₄ are the primary dust remover C ₁
This is for gradually removing contaminants such as dust mixed in the intake air that could not be removed in step ₃ , and the dust removal water is stored in the third and fourth dust removers C ₃ and C ₄ . There is.

Thus, as clearly shown in FIG. 4, a check valve 29 is provided downstream of the tertiary dust removing device C ₃ of the air suction conduit 25, and the check valve 29 is activated by the negative pressure in the tank T. It works to prevent the water in the dust remover C ₃ from flowing back to the tank T side.

A cooling water pipe 31 is connected between the bottom of the _fourth dust remover C4 and the air suction conduit 25 downstream of the check valve 29. The cooling water pipe 31 passes through the stored water of the _third dust remover C3. ing. Quaternary dust remover C during operation of Roots blower B
Part of the water in ₄ is led to the roots blower B
After being cooled, it is returned to the _fourth dust removing device C ₄ . An on-off valve 32 is provided in the middle of the cooling water pipe 31.

The air intake conduit 25, on the downstream side of the check valve 29 is branched a branch pipe 25 ₁ which opens to the atmosphere, the vacuum relief valve 33 and unloading valve 34 on the branch pipe 25 ₁ is on the downstream side Are provided in series. Further, a pressurized safety valve 35 is provided in the middle of the air discharge conduit 26.

Next, the operation of the first embodiment shown in FIGS. 1 to 4 will be described.

In order to suck the sludge into the sludge tank T, the suction end of the flexible suction hose 15 connected to the sludge suction pipe 14 is made to enter the sludge settling layer (not shown), and then the suction valve 13 is opened. The four-way valve V on the air intake side, that is, port P
₁ and P ₂ and ports P ₃ and P ₄ are switched to communicate with each other and the roots blower B is operated, the air in the sludge tank T is opened to the float valve 20, the air outlet 21, the air outlet pipe 22. Flow through the secondary dust removing device C ₂ to the air suction pipe 25 through the air outlet pipe 22 and the four-way valve V, pass through the third dust removing device C _3, and are sucked by the roots blower B. Thus, in the secondary and tertiary dust removers C ₂ and C ₃ , fine contaminants that could not be separated and removed by the primary dust remover C ₁ provided at the air outlet 21 are gradually removed.

The discharge air from the roots blower B is supplied by the air discharge conduit 26,
It is discharged to the outside air through the four-way valve V and the fourth dust remover C ₄ . In the fourth dust remover C ₄ , the contaminants in the air are finally removed, and the silencer 28 provided there silences them.

When the suction valve 13 of the suction hose 15 is opened when the inside of the sludge tank T reaches a predetermined negative pressure value, the sludge can be sucked into the sludge tank T.

When the suction hose 15 is clogged with suction substances and the negative pressure in the sludge tank T rises during the sludge suction work, the operator opens the load release valve 34 to reduce the load on the roots blower B. As a result, the air suction conduit 25 is opened to the atmosphere and the load on the roots blower B is reduced. In this case, assuming a conventional one without the check valve 29, the tank T
High negative pressure by a tertiary filtration apparatus C ₃ in water in directory is will run out of water flow back to the air intake conduit 25 in large quantities through the secondary dust collector C ₂ and sludge tank T in the dust removing system C ₃ Therefore, it becomes necessary to supply water to the device C ₃ . However, water is often not available at the work site. If continued suction work if tertiary filtration apparatus C ₃ at thisゝwithout knowing that the water-free, tertiary divided not only can not be dust in dust C _3, which is overheated cooling efficiency is lowered in the roots blower B This causes the inconvenience of being likely to be

However, by installing the check valve 29 in the air suction conduit 25 as in this embodiment, the reverse flow of water from the tertiary dust remover C ₃ is blocked when the load release valve 34 is opened, and the above-mentioned inconveniences of the conventional one are prevented. Will be resolved.

The check valve 29 may be provided in the air suction conduit 25 between the four-way valve V and the third dust remover C ₃ .

When the sludge level in the sludge tank T rises due to the suction action and the float valve 20 closes, the air suction action of the sludge tank T stops.

Next, to explain the case of discharging the sludge contained in the sludge tank T, the four-way valve V is on the discharge side, that is, the port P thereof.
₁ and P ₃ and their ports P ₂ and P ₄ are communicated with each other, and the load release valve 34 is opened to drive the roots blower B, so that the outside air passes through the load release valve 34 and the air suction conduit 25, and the roots blower B Blower B
Pressurized air from is passed through the air discharge conduit 26 and the air extraction pipe 22 into the sludge tank T under pressure. If the discharge valve 16 of the discharge pipe 17 is opened in this state, the sludge pressurized and stirred is discharged to an appropriate discharge place. If the sludge tank T is gradually tilted during the sludge discharging operation, desired discharging can be performed more efficiently.

FIG. 5 shows a second embodiment of the present invention. In this embodiment, the check valve 29 and the throttle 30 are arranged in parallel with the air suction conduit 25. With this arrangement, when the load release valve 34 is opened, the water in the tertiary dust remover C ₃ is directed to the tank T side. It is possible to keep the inside of the tank T at the atmospheric pressure while preventing the reverse flow of the liquid.

In addition, although the case where the device of the present invention is applied to the sludge tank car has been described in the above-mentioned embodiment, it is needless to say that this can be applied to the manure tank car and other tank cars, and other blowers are used instead of the roots blower. You may. Further, as the check valve and the throttle, the same effect can be used in addition to the first and second embodiments.

C. Effects of the Invention According to the present invention as described above, the suction pipe is clogged with suction substances due to an extremely simple structure in which a check valve is installed in the air suction conduit in the air circuit, and the load on the blower is increased. Even when the load release valve is opened to reduce the amount of water, the water in the dust removal device connected to the air suction conduit of the air circuit does not flow back to the tank side, and the dust removal of the dust removal device is performed during the subsequent suction work. It does not impair the function or overheat the blower.

[Brief description of drawings]

1 to 4 show a first embodiment of the present invention. FIG. 1 is a side view of a sludge truck equipped with the device of the present invention, FIG. 2 is its plan view, and FIG. 3 is a sludge suction system. Is a schematic system diagram of FIG. 4, FIG. 4 is a partially enlarged sectional view of part A in FIG. 3, and FIG. 5 shows a second embodiment of the present invention, which is the same partial view as FIG. B ...... Roots blower, F ...... body frame, T ...... sludge tank, V ...... four-way valve, CA ...... air circuit, tertiary filtration apparatus as C 3 _...... dust collector, P 4 _...... port, 14 ...
... Suction pipe, 22 ... Air extraction pipe, 23 ... Suction port, 27
...... Air release conduit, 29 …… Check valve, 34 …… Load release valve, 35 …… Pressurized safety valve

Claims (1)

[Scope of utility model registration request] 1. A closed tank (T) is mounted on a body frame (F), and an air circuit (CA) connected to a blower (B) and a suction pipe (14) are connected to this tank (T). , By driving the blower (B), the tank (T)
In a tank car in which the inside of the tank (T) is suction-accommodated in the tank (T) by keeping the inside of the tank at a negative pressure and passing through the suction pipe (14), the air circuit (CA) includes the tank (T). ), An air outlet pipe (22), an inlet (23) and an outlet (24) of the blower (B).
The air intake pipe (25) and the air discharge pipe (26), the air open pipe (27) opened to the atmosphere, and the four ports (P _{1 to} P ₄ ) connected to the air extraction pipe ( 22), an air suction conduit (25), an air discharge conduit (26) and an atmosphere open conduit (27) are respectively connected to the air extraction pipe (22).
5) and a four-way valve (V) for selectively switching and communicating the air discharge conduit (26), and the air suction conduit (25) includes a dust remover (C ₃ ) and a check valve (29). Are connected in series, and the load release valve (34) is further downstream than them.
A water removal prevention device for dust removal of a dust removal device in a tank car, characterized by being connected to.