JPH0475918A - Device for pneumatic transportation - Google Patents

Abstract

PURPOSE:To aim at satisfactory carrying in a pipe line by feeding carried goods under pressure by means of an ejector used as a booster, arranged in middle of the pipe line, in addition to the suction of a main ejector positioned on the end of the pipe line. CONSTITUTION:Short pipes 3 for amplification are installed at determined intervals on the way of a main carrying pipe 2 provided with a suction hose 5 on its start end, and a main ejector 10 is installed on its terminal end via a terminal short pipe 4. A compressed air supplying tube 17 is installed in parallel to the carrying pipe, and compressed air is supplied therefrom and the compressed air is supplied to each ejector 11 of the short pipe 3 from a branch pipe 17 via a pipe 18, air supplied from suction pipe 6 on the upstream side, is amplified and jetted to bottom of the main pipe through a blowing pipe 8. Therefore carried goods are carried satisfactorily, while being agitated and discharged by suction of the main ejector 10.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a device for pneumatically transporting objects with relatively large specific gravity within a transportation main, and in particular, earth and sand excavated during civil engineering work, The present invention relates to a pneumatic transport device that transports powder and granular materials with relatively large specific gravity in horizontal and inclined directions.

(Prior Art) When transporting powder or granular materials, pneumatic transport within pipes has been commonly practiced. When carrying out pneumatic transportation of the above-mentioned powder and granules, dry materials of a certain size and relatively low specific gravity, such as soybeans and wheat, can be transported relatively easily by means such as pumping using low-pressure air. It can be transported.

However, if the main transport pipe is long or the main transport pipe is installed at an angle, there are problems such as large transport resistance within the pipeline and poor transport performance. .

Therefore, in conventional pneumatic transportation devices, for example, the fifth
As shown in the figure, a pipe bed ejector 23 is arranged at the end of the transport main pipe 20, intermediate ejectors 22 are arranged at regular intervals in the middle of the pipe, and a near compressor 15 is connected to each ejector. A means of supplying pressurized air is used.

The pressure air supplied from the near compressor 16 is supplied from the pressure air supply pipe 17 to each intermediate ejector and the end ejector via a branch pipe, and the amount of air supplied to each ejector is determined by the valve 18. ... are adjusted respectively.

One diector disposed with respect to the transport main pipe 20 is configured as shown in FIG. 6, for example, and has a suction port connected to a pipe line and a diffusion pipe 24 that is expanded in a trumpet shape.
A plurality of injection nozzles 26 are arranged in a ring shape between the two.

Then, the pressurized air supplied to the air tank 25 is transferred to the nozzle 2.
6, the air in the pipe is accelerated.

According to the above-mentioned transportation method, when a negative pressure is generated in the pipe by an ejector at the end of the pipe and a conveying action is performed by the negative pressure, pressurized air is supplied into the pipe in multiple stages from the ejector provided in the middle. It turns out.

Therefore, the negative pressure in the pipeline becomes lower as it reaches the downstream side of the conveyance path, and the same conveyance effect as in low-pressure pneumatic conveyance occurs, resulting in problems such as a tendency for transportation efficiency to decline. There is.

According to the pneumatic transport method, the specific gravity of the transported object is 1.
．． Although it is suitable for powders, grains, etc. with a specific gravity of about 0, there is a problem in that it cannot exhibit good conveyance performance for materials with a specific gravity higher than that.

In addition to the suction type pneumatic transport device as shown in FIG. 5, a system for pumping powder or granular material as shown in FIG. 7 may be used.

In the example shown in FIG. 7, a supply port 31 and an air blowing pipe 32 are arranged with respect to the transportation main pipe 30,
1 is fed under pressure using pressurized air supplied from the air blowing pipe 32, but it is also possible to supply pressurized air from the middle of the transport main pipe 30.

In the conventional example, the air pressure pipe 3 is installed inside the transportation main pipe 30.
3, and air jet ports 34 are provided at predetermined intervals with respect to the pipe 33. And the spout 3
The pressurized air supplied from No. 4 eliminates plugs in the conveyed material in the transportation main pipe, improves fluidity, and improves conveyance efficiency.

Further, as shown in FIG. 8, when a conveyed object is clogged in the form of a plug in a conduit, a system may be used in which the plug is removed while the conveyed object is force-fed through the conduit.

For example, as in the conventional example shown in FIG. 8, transportation book 1!
30, as in the case of FIG.

Further, a large number of short pipes 36 are provided at predetermined intervals in the downstream part of the air pressure pipe 35 with respect to the transport main pipe 30, and the short pipes 36 are connected to the transport main pipe 30. 30 diameter 10
It is formed to be about twice as long.

If the conveyed object becomes a long plug-like shape in the transportation main pipe 30 and cannot be conveyed, the pressure air passing through the short pipe acts as a feeder to sequentially cut the plugs from the most downstream part. I'm trying to remove the plug.

However, as mentioned above, in the case where the booster means is composed of short pipes, some of the short pipes may become clogged.
If a situation arises in which pressure air does not pass between the short pipes, problems such as the inability to carry out the conveying action within the conduit occur.

On the other hand, for example, as shown in FIG. 9, a method may be used in which the pressurized air supplied from the middle of the pipeline is blown out from any part of the transportation main pipe via the bypass pipe 40. .

In the conventional example shown in FIG. 9, a bypass pipe 40 is provided in parallel to the transportation main pipe 30, the tip of the bypass pipe 40 is connected to the air blowing pipe 32, and air is supplied from the air blowing pipe 32. The pressurized air is also made to flow through the bypass pipe 40.

And between the bypass pipe 40 and the transportation main pipe 30,
A large number of connecting short pipes 41 are arranged at intervals of about 10 times the pipe diameter of the transportation main pipe, and a check valve 43 is provided for each connecting short pipe.

Further, pressure sensors 44 are arranged at intervals of about 20 degrees of the pipe diameter with respect to the transportation main pipe 30, and when the pressure sensor detects that the pressure has increased due to the plug in the pipe, a check valve is activated. 43 is opened to allow pressurized air to be supplied from the bypass pipe 40 to eliminate the plug.

(Problems to be Solved by the Invention) However, in the conventional pneumatic transport device as described above, for example, as shown in FIG. However, there is a problem in that when the push-out action to the downstream side is performed, it can only be applied when the specific gravity of the conveyed object is 1.5 or less.

Therefore, although it can exhibit a relatively good conveyance effect for dry, coarse-grained grains, sand, and other small-grained items, However, it is not possible to exhibit a good conveyance effect.

Furthermore, in the conventional pneumatic transport VR11, if the conveyed material is dry and easily crushed, a large amount of dust will be released at the part where it is discharged from the pipe, so it is necessary to dispose of the dust. , there are disadvantages such as complicated terminal equipment.

(Objective of the Invention) The present invention solves the drawbacks of the conventional pneumatic conveyance device as mentioned above.
Using an amplification ejector member placed in the middle of the conduit,
It is an object of the present invention to provide a pneumatic transport device that can transport even objects with a large specific gravity in good condition by generating turbulent flow in a pipe line with an air flow ejected from an ejector member for amplification. It is said that

(Means for Solving the Problems and Effects) The present invention relates to a pneumatic transportation device that uses a pipe as a transportation main pipe to transport objects mixed with air inside the vibrator.

In the pneumatic transport device of the present invention, a main ejector is arranged at the end of the transport main pipe, a speed increasing device is arranged at a predetermined position in the middle of the transport main pipe, and the speed increasing device is arranged in the transport main pipe. It is composed of a suction pipe that branches air from the pipe, an ejector member, and a blowing pipe, and is configured to blow a high-speed air flow from the top of the transportation main pipe toward the bottom of the pipe.

Furthermore, the ejector member used in the pneumatic transport device of the present invention uses a mechanism called an injection feeder, in which a large number of small-diameter pressurized air injection nozzles are arranged around a suction pipe, and the air is ejected from the nozzles. The air pressure increases the speed of the sucked air and discharges it.

Furthermore, when a water supply pipe is connected to the main ejector of the present invention, water can be mixed in the form of mist with the air flow discharged from the main ejector at high speed, so that dust particles discharged from the pipe can be removed. It becomes possible to suppress the

Therefore, in the pneumatic transport device of the present invention, in addition to the suction action by the main ejector disposed at the end of the pipe,
By using a method in which the conveyed object is force-fed using a booster ejector member disposed in the middle of the conduit, the conveyance within the conduit can be carried out satisfactorily.

In addition, the pneumatic transport device of the present invention can effectively exhibit the transporting action of the earth and sand even if the object to be conveyed is one such as earth and sand, which has a large variation in particle size and contains a large amount of water.

(Example) The configuration of the pneumatic transport device of the present invention will be described according to the illustrated example.

The embodiment of the present invention shown in FIG. A suction hose 5 is provided at the starting end of the conduit, and a main ejector 10 is provided via a terminal short pipe 4 disposed at the terminal end of the conduit.

In the air transport device, a pressurized air supply pipe 17 is arranged in parallel with the transport pipe, a near compressor 16 is connected to the pressurized air supply pipe 17 to supply pressurized air, and an air pipe branched from the pressurized air supply pipe 17 is provided. are connected to each ejector member via a valve 118.

The transport main pipe 2 is constructed from a pipe member such as an iron pipe, and is constructed to have an arbitrary diameter depending on the object to be transported. Further, the amplifying short tube 3 is constituted by a vibrator having the same diameter as the transport main tube, and the suction tube 6 and the blowing tube 8 are connected to the upper part of the amplifying wI tube, and the two suction tubes are connected to each other. An amplifying section 7 is provided between the two.

The main ejector 10 located at the terminal end of the transportation main pipe 2 is
As will be explained later in accordance with FIG. 4, a water supply pipe 19 is provided in the diffusion pipe constituting the discharge part and the juice jetting part, and water can be supplied from the water supply pipe and mixed with the jetted air. It will be done like this.

The amplifying section 7 arranged with respect to the short amplifying tube 3 has a second
As shown in the figure, a suction pipe 6 connected to the upstream part of the short amplification pipe 3, a blowing pipe 8 for injecting pressurized air toward the short amplification pipe 3, and a pipe provided between the suction pipe 6 and the It consists of an ejector member 11 for amplification.

Then, the air sucked from the upper part of the amplification short pipe 3 is increased in speed via the ejector member 11, and is ejected at high speed from the blowing pipe 8 toward the bottom part of the amplification short pipe and the transport main pipe, The conveying action is carried out while stirring the conveyed articles being conveyed within the transportation main pipe.

The main ejector 10 and the ejector member 11 for amplification can each have the same shape. For example, the ejector member 11 as shown in FIG. It can be used as a means to increase the speed of conveying air in a road.

The ejector member 11 shown in FIG.
2b, and a small-diameter squeeze portion 12a.
A plurality of nozzles 14 are arranged downstream of a.

A ring-shaped air chamber 13 is arranged on the outer periphery of the throttle part 12a of the main body 12, and each nozzle 14.
The nozzle is arranged to be inclined at a predetermined angle θ with respect to the axis of the ejector. The inclination angle θ of the nozzle 14 is
In this example, it is set to about 15 degrees, and 1
In the case of a body injection having a diameter of inches, six nozzles are arranged concentrically with respect to the axis of the body.

By arranging each nozzle at the same angle with respect to the axis of the main body, the air ejected from the nozzle is
A spirally rotating airflow is generated along the inner surface of the diffusion tube 15.

Therefore, the airflow ejected along the inner surface of the diffusion tube 15 generates a large negative pressure inside the diffusion tube, so that it has the effect of sucking air from the pipe line connected to the upstream portion of the main body 12. generate.

Then, by the suction action of the air and the extrusion action by the pressure air blown out from the nozzle, the air that has passed through the throttle part 12a of the ejector main body is diffused at a high speed.
15 toward that part of the main pipe, and has the effect of transporting the material in the pipe while stirring it. It should be noted that the diffusion I! 15 is shown as corresponding to the blowing pipe 8 in FIG.

The ejector member shown in FIG. 3 is provided with a main body portion 12 and a diffusion tube 15 that can be separated, and as in the case of the main ejector shown in FIG. By arranging a plurality of the main body members, it is possible to generate negative pressure within the transport pipe and carry out the action of transporting particulate matter.

FIG. 4 shows the configuration of the main ejector 10 disposed at the rear of the transported water@2 of the present invention. In the embodiment shown in FIG. 4, (a) is a plan view of the main ejector;
(b) is a front view seen from the A-A direction in (a);
C) shows the main body with the diffusion direction removed from the small ejector shown in FIG. 3 above.

In FIG. 4(C), the ejector member 60 is constructed by removing the diffusion tube from the ejector member 11 in FIG.
The case where only the main body part is used is shown, and the main body 12 and the ejector member 60 of the above-mentioned embodiment are shown to be the same. A nozzle 14 is disposed in the ejector member 60 downstream of the throttle section, and pressurized air is ejected from the nozzle 14.

The ejector member as described above is used in the main ejector 10 as shown in FIGS. 4(a) and 4(b).
A large diameter flange 51 is provided at the end of the terminal short pipe 4,
A diffuser tube 50 that widens toward the end is provided downstream of the flange 51 .

In the device of the present invention, six ejector members 60 to 65 are arranged at equal angles on the circumference with respect to the flange 51.

The ejector member is attached to the mounting portion 5 with respect to the flange 51.
2, and the exhaust part of the ejector member is opened at the downstream part of the flange. In addition, in the above embodiment, when the diameter of the transportation main pipe is 6 inches, as illustrated, by arranging six ejectors with a diameter of 1 inch, the suction and conveyance action at the end of the transportation pipe is performed. I can be pampered.

Suction tubes 70 to 75 are connected to each of the ejector members 60 to 65 from the upper part of the short terminal tube 4, and the ends of the suction tubes are connected to the connecting portions of the respective ejector members. The suction pipe connecting the tube bed short pipe 4 and the ejector can be any pipe-shaped member such as a rubber hose or iron pipe.

Further, in the example shown in FIG. 4(a), the connection portions of the suction tubes 70 to 75 with the terminal short tubes are provided at the upper part of the short tubes. This is because in the case of large gravel, sand, etc., it is presumed that very few particles pass through the upper part of the transport pipe, and only relatively small diameter particles pass through the upper part of the pipe.

When air for conveyance is introduced into the ejector member from the upper part of the conduit via the suction tube, even if a lump or the like enters the conduit, it must be smaller than the inner diameter of the constriction part of the ejector member. is ejected from the main ejector as it is blown away by a high-speed airflow inside the ejector member.

As described above, when the main ejector 10 is disposed at the end of the transportation main pipe of the present invention, a large number of ejector members are disposed around the outer circumference of the main ejector 10, and each ejector member is By ejecting pressurized air spirally from the member, the diffusion tube 5 of the main ejector 10 is
At zero, a large negative pressure can be generated. The negative pressure generated by the main ejector has the effect of sucking out the conveyed objects together with the conveying air from inside the transportation main pipe.

In addition, in the main ejector, the number of ejector members arranged to surround the terminal short pipe, the pressure of the air supplied to the ejector members, etc. will vary depending on the nature of the granular material (earth and sand) to be transported, the moisture content, etc. Set arbitrarily.

Furthermore, the diameter and number of nozzles provided in the ejector member,
As described above, the direction of inclination of the nozzle and the like are selected depending on conditions such as the properties of the conveyed object, the diameter of the transportation main pipe, and the like.

In the example shown in FIG. 1, the pneumatic transport device of the present invention configured as described above sucks the transported material from the suction hose 5 using the negative pressure generated by the main ejector 1°, and pumps the transported material into the transport main pipe 2. It acts to transport. Note that the main ejector 10 can generate, for example, a negative pressure of about -500 am/Aq inside the pipe.

Then, an amplifying section 7 is placed in the middle of the front piping path via a short amplifying tube 3, and the conveyed material in the pipe is Stir and
The conveying action is performed while the air mixed with the conveyed material is spirally swirled within the pipe.

Further, the amplification ejector member 11 connected to the amplification short tube 3 can have a diameter of about 20% of the main ejector, for example, and sucks the air above the amplification short tube to increase the amplification. By blowing out the aerosolized air into the transport main, the transport action described above can be achieved.

In addition, when connecting the amplifying device provided with the ejector member to the main pipe (Fig. 2), the blowing pipe 8 may be installed at a slight angle with respect to the axis of the main pipe. In this case, it is possible to generate a spiral air flow inside the main pipe using the amplifying air, and it is also possible to perform the conveying action inside the main pipe in a good condition.

Therefore, in the pneumatic transportation device of the present invention, while the conveyed material is stirred in the transportation main pipe, it is sucked by the negative pressure and pushed by the booster means, so that lumps such as earth and sand are removed. Even for things that are scattered,
The conveying action by the air flow can be carried out in a good condition, and problems such as clogging of earth and sand in the pipes do not occur.

Furthermore, in the device of the present invention, water supply means is provided for the main ejector provided at the end of the pipe, so that
Since water is sprayed in the form of mist onto the conveyed material ejected from the main ejector, generation of dust can be prevented. Also, as mentioned above, for the main ejector,
When water is sprayed based on the amount of water absorbed, the negative pressure caused by the ejector can be increased, and the negative pressure can be increased compared to the case where only pressurized air is simply ejected.

In addition, in the pneumatic transportation device of the present invention described above, in addition to arranging the pipes horizontally, it is also possible to arrange the pipes in any arbitrary state, such as vertically in a shaft or the like, or transporting in inclined pipes. A conveyance path can be arranged, and the conveyed material is excavated earth and sand, for example, with a maximum particle size of 30 to 50 mm.
It can be crushed to about m+ size and used for pneumatic transport.

(Effects of the Invention) Since the pneumatic transport device of the present invention has the above-described configuration, in addition to the suction action of the main ejector disposed at the end of the conduit, the pneumatic transport device of the present invention has the suction action of the main ejector disposed at the end of the conduit. By using the ejector member in combination with a method of force-feeding the conveyed object, it is possible to carry out the conveyance within the conduit well.

Furthermore, in the device of the present invention, the plurality of ejector members disposed in the conduit can be configured by the same ejector, so the types of component members of the device can be reduced and maintenance can be facilitated. I can do it.

In the pneumatic conveyance device of the present invention, the conveyed object may be earth and sand, etc.
Even if the particle size varies widely and contains a large amount of water, the soil can be transported well.

Further, when the device of the present invention is used to transport excavated earth and sand from a shaft or the like, the structure of the transport device can be simplified, and the area occupied by the transport inside the shaft can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the configuration of the pneumatic transport device of the present invention, FIG. 2 is an explanatory view showing the configuration of the amplification short tube and the amplification section, and FIG.
The figure is an explanatory diagram showing the structure of the ejector member used in the present invention, and FIG. 4 shows the structure of the main ejector of the present invention.
Figure (a) is a plan view thereof, (b) is a front view seen from the direction A-A, and figure (C) is a cross-sectional view of the ejector.
Figure 6 is an explanatory diagram of a conventional pneumatic conveyance system, Figure 6 is an explanatory diagram of an ejector used in the apparatus shown in Figure 5, Figure 7 is an explanatory diagram of a conventional pressure-feeding pneumatic conveyance system, and Figure 8 is an explanatory diagram of a conventional pneumatic conveyance system. FIG. 9 is an explanatory diagram of a plug removal system in a transportation main, and FIG. 9 is an explanatory diagram of an improved type of pneumatic transportation device shown in FIG. 8. Reference numerals in the figure: 1...Pneumatic transportation device, 2...Transport main pipe, 3...Short tube for amplification, 4...Terminal short tube, 5 Suction hose for... 6... Suction pipe, 7... Amplifying section, 8... Blowing pipe, 1
0... Main ejector, 11... Ejector member, 12... Ejector body, 13...
...Air chamber, 15...Diffusion tube, 16. Old.
・Near compressor, 20, 30... Transportation main, 22, 23... Ejector, 32...
・Air blowing pipe, 40...Bypass pipe.

Claims (1)

[Scope of Claims] A device that uses a pipe as a transport main and transports objects in a state mixed with air inside the pipe, wherein a main ejector is disposed at the end of the transport main, and the transport main A speed increasing device is arranged at a predetermined position in the middle of the transport pipe, the speed increasing device is composed of a suction pipe that branches air from the transport main pipe, an ejector member, and a blowing pipe,
A pneumatic transportation device characterized by being configured to blow a high-speed air flow from the top of a transportation main pipe toward the bottom of the pipe.