JPH0692406A - Vehicle loading type vacuum suction device - Google Patents

Abstract

PURPOSE:To reduce a frequency for unloading work by circulating dust, etc., which are sucked to the dust eliminating device side in a cyclone device and the like, to a tank without natural sedimentation inside the tank so as to enable to recover them and reducing the dust volume to be eliminated by the dust eliminating device. CONSTITUTION:A cyclone device 23 is connected to a tank 2, the bottom part of the cyclone device 23 and the tank 2 are connected together by a circulating pipe 24, and in the close part to the bottom part of the cyclone device 23 in the circulating pipe 24, a suction pipe led to the atmosphere is arranged to face the tank 2 side, so that air flow destined to the tank 2 is generated inside the circulating pipe 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to 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.

[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 results in sucking and transporting water that should not be transported, resulting in the recovery work and transport of the recovered object. The waste of both works is large, and at the same time, the work of adding water to a large amount of collected objects is also difficult, and when a large amount of water is added to these collected objects, 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 aims to effectively collect in the cyclone device 3 by injecting water into the dust particles that are not contained in the tank 2 and are going to enter the cyclone device 3, injecting the water in a spray form to make it easily settle. 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.

As described above, when water is sprayed on the dust contained in the suction airflow 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 is eliminated, the cyclone device 3 and the roots blower 1 can be directly connected to each other, and the dust of the roots blower 1 hardly reaches the portion, which is an excellent effect of preventing its rapid wear. 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 in 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, dust may be sucked up to this part, so suction and recovery with a capacity considerably smaller than the maximum capacity. I'm working. Therefore, work efficiency becomes poor.

[0007]

DISCLOSURE OF THE INVENTION The present invention makes it possible to recover the dust that has been sucked toward the dust removing device such as a cyclone device without returning to the tank by recirculating to the tank to recover the dust. The amount of dust removed by the removal device is reduced, the frequency of the removal work is reduced, and at the same time, the suction device is driven with a capacity close to the maximum capacity to enhance the efficiency of suction recovery work.

[0008]

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 so as to face the tank. The air flow from the bottom of the cyclone device to the tank is generated in the return pipe.

[0009]

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 an airflow from the bottom of the cyclone device toward the tank is generated in this reflux pipe, so that it is attempted to settle and deposit at the bottom of the cyclone device. The generated dust is returned to the tank by the air flow flowing in the return pipe and collected therein.

[0010]

EXAMPLES 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.

Further, as shown in FIG. 3, in a portion near the bottom of the cyclone device 23 inside the reflux pipe 24, there is 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.

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. Due to the air flow toward 2, the dust particles 29 that settle down and accumulate at the bottom of the cyclone device 23.
Is flown in the return pipe 24 along with the above-mentioned air flow, and is returned to the tank 2 to be recovered. The return pipe 24
Is connected to the bottom of the cyclone device 23 slightly above, so that a small amount of dust 29
Are accumulated.

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 that has flowed into the cyclone device 23 together with the suction airflow without spontaneously settling in the tank 2 is 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.

Further, 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.

[0015]

EFFECTS OF THE INVENTION According to the present invention, the dust generated by sucking and collecting the object to be collected in the form of powder or granules does not spontaneously settle in the tank and sucks up to the subsequent cyclone device. In this case, since the dust is removed by this cyclone device and is returned to the tank for recovery, the dust that is removed by the dust removal device such as the cyclone device and accumulated on this The amount of is drastically reduced.
As a result, in the conventional device, it was necessary to take out the accumulated dusts removed by the dust removing device such as the cyclone device at a rate of several times a day, but according to the device of the present invention, The frequency is drastically reduced, and since the suction device is driven with a capacity close to the maximum capacity to collect the powdery or granular material to be recovered, the efficiency of the original powdery or granular material collecting operation 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 28: Suction pipe 29: Dust

Claims (1)

[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 communicating with the atmosphere is arranged toward the side of the tank to generate an air flow in the reflux pipe from the bottom of the cyclone device to the tank, and is collected by the cyclone device and deposited on the bottom thereof. A vehicle-mounted vacuum suction device characterized in that the dust to be collected is returned to the tank and collected.