JPH089402B2 - Dust recycling device in vehicle-mounted vacuum suction device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust recirculation device in a vehicle-mounted vacuum suction device used for recovering a powdery or granular material to be recovered by a vacuum suction force and an air transportation force.
It is about the table .

[0002]

2. Description of the Related Art A vehicle-mounted vacuum suction device is used to suck and collect liquids, powders and solids with a large vacuum suction force and an air transportation force, and the principle thereof is shown in FIG. Has been done. A cyclone device 3 for collecting dust that has not settled in the tank 2 and a bag filter device 4 are provided between a roots blower 1 which is a suction device and a tank 2 for storing an object to be sucked. The respective devices are connected by pipes 5, 6, and 7, respectively. Therefore, the vacuum suction force generated by the rotation of the roots blower 1 reaches the tank 2, the cyclone device 3, and the bag filter device 4, and the substance A to be collected in the form of granules is sucked into the tank 2 by the suction recovery pipe 8. It is then allowed to settle and is then recovered.

When the material A to be recovered is a powdery or granular material, dust is generated during its suction. Since this dust is light, part of it does not spontaneously settle in the tank 2 and is sucked up to the cyclone device 3 or the bag filter device 4, and the dust is removed by these devices 3 and 4. The air discharged from the roots blower 1 is
It is cleaned by the air cleaning device 9 and released into the atmosphere. However, the dust is not completely removed by the cyclone device 3 and the bag filter device 4, and the roots blower 1 is also sucked. When this happens, the roots blower 1
The sliding parts of are severely worn. As a result, the suction performance of the roots blower 1 is drastically reduced, and it is necessary to replace it. For this reason, when recovering an object to be recovered in the form of powder or granules, a large amount of water is added to the entire object to be recovered so as to prevent dust from scattering. In this way, even if it is possible to prevent dust from being sucked up to the roots blower 1, it is possible to suck and transport water that should not be transported, resulting in the work of collecting and transporting the collected objects. The waste of both works is great, and at the same time, the work of adding water to a large amount of recovered material is also difficult, and when a large amount of water is added to these recovered materials, it becomes sludge-like, That process becomes a problem. Further, the bag filter device 4, which is one of the dust removing devices, is expensive and has a problem that it occupies a large space when loaded on a vehicle.

Therefore, the inventor of the present invention has devised a device that does not suck dust to the roots blower without adding water to the powdery or granular material to be recovered, and filed an application as Japanese Patent Application No. 2-33358. went. This device is intended to effectively collect the dust that is not contained in the tank 2 and enters the cyclone device 3 by injecting water into the form of a spray so that the dust can be easily settled by the cyclone device 3. is there. As shown in FIGS. 4 and 5, the structure is such that the spraying device 11 is attached to the portion of the pipe 5 that connects the tank 2 and the cyclone device 3, and the dust that has not settled in the tank 2 When the contained suction airflow passes through the pipe 5, water is sprayed into the airflow by the spraying device 11 and ejected, so that the dust contained in the suction airflow easily contains water and thus sinks easily. This effectively removes dust in the cyclone device 3.

The water is supplied to the spraying device 11 by the following device. The bottom of the cyclone device 3 is provided with a dust storage chamber 12 for storing dust collected by the cyclone device 3, and the storage chamber 12 and the sealed first water storage tank 13 are non-returnable. It is connected by a pipe 15 provided with a valve 14 and is also connected by a communication pipe 16 to equalize the pressures of the storage chamber 12 and the first water storage tank 13. The dust accommodating chamber 12 of the cyclone device 3 accommodates the dust and the water, which have contained a large amount of water by the spraying device 11, vertically separated. This clear water portion and the first water storage tank 13
Since the and are connected by the pipe 15, the water accumulated in the dust accommodating chamber 12 flows into the first water storage tank 13 through the pipe 15 and is stored therein. The water that flows into the first water storage tank 13 also contains dust, and this dust settles and accumulates at the bottom. The first water storage tank 13 is provided with a lid 13a for communicating with the atmosphere. When the lid 13a is opened, the water in the first water storage tank 13 is provided with a check valve 17. The water flows out through the pipe 18 and is stored in the second water storage tank 19. The second water storage tank 19 and the spraying device 11
And are connected by a siphon 21. Then, since the inside of the pipe 5 in which the spraying device 11 is provided has a negative pressure, the water in the second water storage tank 19 naturally synergizes with the siphon action up to the part of the spraying device 11. It is sucked up. In this way, the water sprayed into the suction airflow containing dust is circulated and used.

[0006] As described above, when water is injected into the dust contained in the suction air stream flowing into the cyclone device 3, the dust is effectively settled and recovered in the portion of the cyclone device 3. , The bag filter device 4 can be eliminated, the cyclone device 3 and the roots blower 1 can be directly connected, and the dust of the roots blower 1 hardly reaches the part, which is an excellent effect that the rapid wear can be prevented. Great technological progress was made. However, in an actual recovery operation, a large amount of dust settles and accumulates in the dust storage chamber 12 at the bottom of the cyclone device 3 in order to collect a large amount of the collected objects every day. Therefore, it is necessary to open the lid (not shown) provided at the bottom of the cyclone device 3 several times a day to take out the dust accumulated in the dust accommodating chamber 12 of this portion, and for this purpose, In addition to having to interrupt the recovery work of No. 3, the work itself of taking out dusts from the bottom of the cyclone device 3 was troublesome. Even when such a spraying device 11 is provided, when the roots blower 1 is driven with the maximum capacity, dusts may be sucked up to this part, so suction is performed with a capacity considerably smaller than the maximum capacity. Collection work is in progress. Therefore, work efficiency becomes poor.

The bottom of the cyclone device 3 and the tank 2
Is connected to the bottom of the cyclone device 2 by a reflux pipe.
Dust accumulated in the recirculation pipe by the action of compressed air
In some cases, the technology of returning the material to the tank 3 via
Has been. However, this technology generates compressed air
It is necessary to have a compressor for
Compressed air is pumped into the tank occasionally or intermittently
Because of this, the pressure in the tank increases by that amount
It is fatal that the ability to suck and collect physical objects to be collected will decrease.
There are some drawbacks.

[0008]

DISCLOSURE OF THE INVENTION The present invention makes it possible to recover the dust sucked toward the dust removing device such as a cyclone device without spontaneously settling in the tank by returning the dust to the tank with no power. By reducing the amount of dust removed by the dust removal device and reducing the frequency of its removal work, at the same time, by driving the suction device with a capacity close to the maximum capacity, the efficiency of suction recovery work can be improved. is there.

[0009]

The means adopted by the present invention in order to solve this problem are a suction device and a powdery or granular material to be recovered which is suctioned from the outside by the suction force of the suction device and naturally sediments. A vehicle-mounted vacuum equipped with a tank for accommodating an object, and a cyclone device connected to the tank for collecting the dust sucked toward the suction device without settling in the tank In the suction device, the tank and the bottom of the cyclone device are connected by a reflux pipe, and a suction pipe communicating with the atmosphere is arranged in a portion of the reflux pipe close to the bottom of the cyclone device, facing the side of the tank. The pressure inside the tank and the atmosphere are negative.
It is configured such that an air flow from the bottom of the cyclone device to the tank is generated in the reflux pipe only by the pressure difference from the pressure .

[0010]

According to the present invention, a cyclone device is connected to a tank for accommodating an object to be recovered, the tank and the bottom of the cyclone device are connected by a reflux pipe, and a portion of the reflux pipe that is close to the bottom of the cyclone device. When the suction pipe communicating with the atmosphere is disposed toward the tank side, the internal pressures of both the tank and the cyclone device are negative pressure, and the suction pipe faces the tank side. Due to the difference between the internal pressure and the atmospheric pressure, the outside air is sucked from the suction pipe and flows in the reflux pipe toward the tank. The dust that has not spontaneously settled in the tank flows into the cyclone device together with the suction airflow, is collected by this, and settles to the bottom thereof. The bottom of the cyclone device and the tank are connected by a reflux pipe, and the airflow from the bottom of the cyclone device to the tank is constantly generated in this reflux pipe, so let it settle on the bottom of the cyclone device. And the dust
The airflow flowing in the return pipe is returned to the tank with no power and is collected in the tank.

[0011]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. The same parts as those described in the above-mentioned "Prior Art" are designated by the same reference numerals, and only the characteristic parts of the present invention will be described while avoiding duplicated description. Figure 1
FIG. 3 is a side view of a vehicle 22 loaded with a vacuum suction device according to the present invention, FIG. 2 is a diagram showing the principle of the vacuum suction device according to the present invention, and FIG. 3 is an enlarged cross-sectional view of the bottom of the cyclone device 23. Is. In this embodiment, in the above vacuum suction device provided with the spraying device 11, another cyclone device 23 is arranged between the tank 2 and the cyclone device 3, and the bottom of the cyclone device 23 and the tank 2 are connected to each other. Are connected by a reflux pipe 24. The cyclone device 23 is integrally attached to the tank 2 via a connecting arm (not shown). Cyclone device 23 integrally mounted on the tank 2 and cyclone device 3 mounted on the carrier of the vehicle
Are connected to a flexible hose 26 reaching the rotation fulcrum 25 of the tank 2 via a pipe 27 connected to the hose 26.

As shown in FIG. 3, a portion of the return pipe 24 near the bottom of the cyclone device 23 is provided with a suction pipe 28 which is bent substantially at a right angle and has one opening communicating with the atmosphere. The other opening is arranged to face the tank 2. A small inner diameter portion 24a having an inner diameter smaller than the other portions is formed in a portion of the return pipe 24 near the bottom portion of the cyclone device 23, and the opening of the suction pipe 28 faces the small inner diameter portion 24a. It is arranged. Therefore, when the vacuum suction force is applied to both the tank 2 and the cyclone device 23 by the rotation of the roots blower 1, the internal pressure of these becomes negative pressure, and moreover, since the suction pipe 28 faces the tank 2 side, Due to the difference between the internal pressure of the tank 2 and the atmospheric pressure, the suction pipe 28
The outside air is sucked from the inside and flows in the return pipe 24 toward the tank 2 side. In particular, as in this embodiment, the reflux
A small inner diameter portion 24a is provided in the ip 24, and the suction pipe 28
When the opening of is exposed to the small inner diameter portion 24a,
Since the speed of the suction airflow in the portion 24a becomes faster,
There is an advantage that the suction effect of the kind is increased.

When the roots blower 1 is rotated,
The vacuum suction force generated by this reaches the tank 2, the cyclone device 23, and the cyclone device 3, and the substance A to be recovered in the form of powder or granules is sucked into the tank 2 by the suction recovery pipe 8 and spontaneously settles. , Recovered. Part of the dust generated at that time is generated by the suction airflow, and the cyclone device 2
Inflow to 3. Most of the dust that has flowed into the cyclone device 23 is collected by this device 23 and tends to settle and deposit on the bottom of the cyclone device 23. However, as described above, in the reflux pipe 24, a tank is discharged from the bottom of the cyclone device 23. The dust 2 which is settling and depositing on the bottom of the cyclone device 23 because the airflow toward 2 is always generated.
9 directly flows through the reflux pipe 24 by riding on the above air flow.
It is then returned to the tank 2 and collected. Since the return pipe 24 is connected to the bottom of the cyclone device 23 slightly above, a small amount of dust 29 is accumulated on the bottom of the device 23.

In this way, most of the dust that is generated by sucking the object A to be collected in the form of powder and granules and has flown into the cyclone device 23 together with the suction airflow without spontaneously settling in the tank 2. After being collected by the cyclone device 23, it is returned to the tank 2 and collected. The dust that has not been collected by the cyclone device 23 flows into another cyclone device 3 that follows, but at this time, water is sprayed from the spray device 11 to facilitate sedimentation. Therefore, as described above, the dust sprayed with water is stored in the dust storage chamber 12 at the bottom of the cyclone device 3. Therefore, the airflow discharged from the cyclone device 3 contains almost no dusts, and the dusts hardly reach the portion of the roots blower 1. In front of the cyclone device 3 for spraying and collecting water on the dust, a cyclone device 23 for collecting the dust contained in the air stream and returning it to the tank 2 is provided. Since most of the dust is collected by the device 23, the amount of dust removed by the cyclone device 3 is extremely small as compared with the case where the cyclone device 23 is not provided. As a result, the frequency of taking out the dust contained in the dust containing chamber 12 at the bottom of the cyclone device 3 is drastically reduced. In addition, since the efficiency of collecting dust is high, even if the roots blower 1 is driven with a capacity close to the maximum capacity, the dust is not sucked into the roots blower 1 portion, and it is possible to collect dust particles. The efficiency of the work of collecting the objects is improved.

In the above embodiment, the cyclone device 23 connected to the tank 2 by the reflux pipe 24 is
Although another cyclone device 3 is connected and the spraying device 11 is provided at the connection portion of each cyclone device 23, 3, the present invention is not limited to this embodiment, and the reflux is not limited to this embodiment. A dust removing device of any structure may be connected to the cyclone device 23 connected to the tank 2 by the pipe 24, and when the cyclone device 23 alone provides a sufficient recovery rate, this cyclone device 23 is used. Two
It is also possible to directly connect the roots blower 1 to 3.

[0016]

The present invention provides a vehicle-mounted vacuum suction device having the above-described structure.
In the pulling device, return the tank and the bottom of the cyclone device.
Cyclone in the reflux pipe connected by a flow pipe
Suction pipe leading to the atmosphere near the bottom of the device
Is placed toward the side of the tank to create a negative pressure.
The above-mentioned reflux only by the pressure difference between the tank internal pressure and the atmospheric pressure.
In the pipe from the bottom of the cyclone device to the tank
Since it has a configuration that constantly creates an airflow that is directed toward it,
Powder that is collected by the Klong device and is about to be deposited on the bottom
Dust is returned to the tank immediately by riding on this suction airflow.
Be recovered. Thus, the present invention provides a tank and
Make sure that each internal pressure of the Kron device is negative and that it is atmospheric pressure.
It is used only for natural use without using any external power.
Cyclone only by elephants (ie, by unpowered)
Dust collected by the equipment and trying to accumulate on the bottom
Can be returned to the tank. As a result, the amount of dust that is removed by a dust removal device such as a cyclone device and accumulates on it is drastically reduced.
It was necessary to take out the dust accumulated and removed by a dust removing device such as a cyclone device, but the device according to the present invention drastically reduces the frequency and drives the suction device with a capacity close to the maximum capacity. By doing so, the object to be recovered in the form of powder or granules can be recovered, so that the efficiency of the original work of recovering the powder or granules can be improved.

[Brief description of drawings]

FIG. 1 is a vehicle 22 equipped with a vacuum suction device according to the present invention.
FIG.

FIG. 2 is a principle view of a vacuum suction device according to the present invention.

3 is an enlarged cross-sectional view of the bottom of the cyclone device 23 in FIG.

FIG. 4 is a principle diagram of a conventional vacuum suction device using a spraying device.

FIG. 5 is a first and second water storage tank 1 in FIG.
It is an enlarged view of the part of 3,19.

FIG. 6 is a principle view of a vacuum suction device before using a spraying device.

[Explanation of symbols]

1: Roots blower (suction device) 2: Tank 23: Cyclone device 24: Reflux pipe 24a: Small inner diameter part 28: Suction pipe 29: Dust

Claims (2)

[Claims] 1. A suction device, a tank for accommodating an object to be recovered in the form of granules, which is sucked from the outside by the suction force of the suction device and spontaneously settled, and the suction without settling in the tank. In a vehicle-mounted vacuum suction device equipped with a cyclone device connected to the tank for collecting dust suctioned to the device side, the tank and the bottom of the cyclone device are connected by a reflux pipe. , In a portion of the reflux pipe close to the bottom of the cyclone device,
A suction pipe that communicates with the atmosphere is arranged toward the tank side, and the pressure difference between the tank internal pressure, which is a negative pressure, and the atmospheric pressure.
Only by generating an airflow from the bottom of the cyclone device to the tank in the reflux pipe, the dust collected by the cyclone device and about to be deposited on the bottom is recycled to the tank to be collected. Powder in a vehicle-mounted vacuum suction device characterized by being configured as
Dust recycling device . 2. Bottom of cyclone device in reflux pipe
A small inner diameter part is provided near the
The small inner diameter portion is faced to the inner diameter portion according to claim 1.
Dust recycling device for vehicle-mounted vacuum suction device .