JP3282146B2 - High-efficiency suction device using high-speed composite flow - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
More specifically, the present invention relates to a suction device used for discharging slurry such as mud and sand accumulated on a riverbed or the like, and more specifically, a high-speed composite flow that performs high-efficiency suction by combining a liquid straight jet stream and a gas swirling jet stream. It relates to a high-efficiency suction device used.

[0002]

2. Description of the Related Art Conventionally, pumping in dredging work has
A general-purpose pump is used as a suction device. In addition, a mechanical suction device using an impeller is often used for discharging slurry such as mud and sand accumulated on the seabed, riverbed and the like.

[0003]

However, when pumping capacity is insufficient due to pumping by a general-purpose pump, the only solution is to increase the number of pumps. For this reason, when trying to secure a high pumping capacity, it was inevitable that the equipment cost would increase.

[0004] With respect to a mechanical suction device using an impeller, the impeller is worn due to contact with mud, sand, or the like, and the discharge capability is reduced at an early stage. There's a problem. Also, as with pumping with a general-purpose pump,
Inevitably increases equipment costs.

The present invention has been made in view of the above circumstances, and can easily and economically secure a high capacity in pumping, discharging mud, sand and the like, and maintain the high capacity stably for a long period of time. It is an object of the present invention to provide a high-efficiency suction device using a high-speed composite flow that can be used.

[0006]

In order to achieve the above object, a high-efficiency suction device using a high-speed composite flow according to the present invention comprises:
The first in which the liquid is made into a straight jet stream and blown into the center of the pipe
A main pipe equipped with a header and a second header that blows gas into a swirling jet stream into the outer periphery of the pipe includes a sub pipe for sucking a fluid to be suctioned such as a gas, a liquid, or a slurry.
A connection is made on the downstream side of the header and the second header, and the inside diameter of the main pipe is reduced on the downstream side of the connection portion.

In the high-efficiency suction device utilizing the high-speed composite flow according to the present invention, the sub-pipe has a negative pressure because the straight jet stream of the liquid flows at a high speed in the center of the main pipe. In addition, the swirling jet flow of the gas flows around the straight jet flow of the liquid at high speed, thereby reducing the tube resistance, etc.
The straight jet of liquid is accelerated. Thus, a fluid to be sucked such as a gas, a liquid, or a slurry is sucked into the main pipe through the sub pipe.

The fluid to be sucked into the main pipe forms a three-layer flow together with the straight jet flow of liquid and the swirling jet flow of gas, and flows at a high speed toward the discharge port downstream from the connection with the sub pipe. Although the flow proceeds, the flow velocity further increases because the inner diameter of the main pipe is reduced downstream of the connection portion, and the pressure is rapidly released at the discharge port, so that the discharge is explosively discharged out of the pipe. This sudden pressure release is fed back upstream, further accelerating the wicking through the sub-tube.

For these reasons, in the high-efficiency suction device using the high-speed composite flow according to the present invention, the amount of suction increases dramatically without additional pumps.

That is, if an existing general-purpose pump is connected to the first header, the effect of the present invention is obtained in addition to the suction by the general-purpose pump, and the suction amount is increased several times at once. That is,
The high-efficiency suction device using the high-speed composite flow according to the present invention,
In pumping, etc., it functions as an effective booster system that increases the capacity of general-purpose pumps.

In order to effectively bring out the effects of the present invention, it is preferable that the inner diameter of the sub pipe is smaller than the reduced inner diameter of the main pipe. It is also recommended that a third header be provided near the suction port of the sub-pipe to blow gas into the pipe as a swirling jet stream. It is preferable to connect the third header to a common compressor with the second header from the viewpoint of facility simplification.

In dredging, it is necessary to excavate the bottom of a river or lake. As the excavator, as in the main pipe, a fourth header that blows a liquid into a straight jet stream and blows it into the center of the pipe near the suction port of the sub pipe, and a fifth header that blows gas into a swirl jet stream and blows the circumference of the pipe. It is preferable in terms of efficiency to provide a composite flow ejection pipe equipped with the above. Here, it is preferable that the fourth header is connected to a common pump common to the first header and the fifth header is connected to a compressor common to the second header from the viewpoint of facility simplification.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a high-efficiency suction device using a high-speed composite flow according to an embodiment of the present invention.

A high-efficiency suction device utilizing a high-speed composite flow according to an embodiment of the present invention comprises a main pipe 10 constituting a main body of the device.
A sub pipe 20 connected to the main pipe 10 for sucking a gas, a liquid, a slurry as a solid-liquid mixture, and the like;
, And a compressor 40 combined with the main pipe 10 and the sub pipe 20.

Here, the general-purpose pump 30 sucks water 50, which is an object to be sucked, and sends it to the main pipe 10 as high-pressure water, and the compressor 40 pressurizes air to compress the main pipe 10 and the sub-pipe 20.
Send to

The main pipe 10 has a double pipe structure in which an inner pipe 12 is inserted inside an outer pipe 11 except for one end thereof. A first header 13 and a second header 14 are attached to one end of the outer tube 11.

The first header 13 has a straight nozzle 13a located at the center of the outer tube 11, and has a general-purpose pump 30.
Is jetted from one end of the outer tube 11 to the center of the outer tube 11 as a high-pressure straight jet stream A by the straight nozzle 13a. The second header 14 is provided with a plurality of inclined nozzles 14a, 14a,... Inclined with respect to both the pipe axis direction and the pipe circumferential direction. 14
As a, a high-pressure swirling jet stream B is jetted from one end of the outer tube 11 to the inner peripheral portion of the tube.

The auxiliary pipe 20 is a vertical pipe inserted into the water 50 to be sucked, and one end (here, upper end) is
The downstream side of the first header 13 and the second header 14 is connected to the outer pipe 11 of the main pipe 10. And the inner pipe 12 of the main pipe 10 is inserted downstream from this connection part.
Thereby, the inner diameter of the main pipe 10 becomes smaller downstream of the connection part.

That is, assuming that the inner diameter of the outer pipe 11 is D1 and the inner diameter of the inner pipe 12 is D2, the inner diameter of the main pipe 10 is D1 up to the connection portion and D2 (<D1) downstream of the connection portion.

If the inner diameter of the sub pipe 20 is D3, D
1>D2> D3, and the inside diameter D3 is set smaller than the inside diameter D2 of the main pipe 10 downstream of the connection portion.

The other end (the lower end in this case) of the sub pipe 20 is a suction port for water 50. A third header 21 is provided at the other end.
Is installed. Like the second header 14, the third header 21 includes a plurality of inclined nozzles 21a, 21a,... Which are inclined in both the pipe axis direction and the pipe circumferential direction, and is pressurized by the compressor 40. Air is jetted from the other end of the sub pipe 20 into the pipe as a high-pressure swirling jet stream C by a plurality of inclined nozzles 21a. As will be described in detail later, the water 50 sucked from the other end of the sub pipe 20 is discharged from the other end of the main pipe 10.

In the high-efficiency suction device using the high-speed composite flow according to the embodiment of the present invention, the pump 50 and the compressor 40 are operated to pump the water 50 with high efficiency.

That is, when the pump 30 is operated, the water 50
Is sucked. The water 50 circulates at a high speed as a straight jet stream A in the center of the main pipe 10. As a result, a negative pressure is generated inside the sub pipe 20 connected to the main pipe 10 due to the Venturi effect. Further, by operating the compressor 40, the high-pressure air becomes the swirling jet stream B and circulates through the main pipe 10 while swirling around the straight jet stream A at high speed. As a result, the straight jet flow A is accelerated with reduced tube resistance. As a result, the water 50 is sucked into the main pipe 10 through the sub pipe 20.

The water 50 sucked into the main pipe 10 forms a three-layer flow together with the straight jet stream A and the swirling jet stream B, and flows at a high speed toward the other end downstream from the connection with the sub pipe 20. Although the flow proceeds, since the inner diameter of the main pipe 10 is reduced downstream of the connection portion, the flow velocity further increases, and the pressure is rapidly released at the other end which is the discharge port. Explosively discharged to This rapid pressure release is fed back to the upstream side, and the water 5
Further accelerate the zero aspiration.

In addition, in the high-efficiency suction device using the high-speed composite flow according to the embodiment of the present invention, high-pressure air is blown into the pipe as the swirling jet stream C near the suction port of the sub pipe 20. As a result, the water 50 rising in the sub pipe 20 is accelerated by the decrease of the pipe resistance and the air lift effect due to the dispersion and mixing of the fine bubbles in the water, and the suction amount is increased.

Thus, in the high-efficiency suction device using the high-speed composite flow according to the embodiment of the present invention, the suction amount increases several times as compared with the case where only the pump 30 is used, and reaches eight times in the experiment. That has been confirmed.

That is, the high-efficiency suction device using the high-speed composite flow according to the embodiment of the present invention is used as a pumping device. In this pumping device, the boost effect by the compressor 40 can be obtained without adding the pump 30. As a result, the amount of suction is greatly increased.

Therefore, the high-efficiency suction device using the high-speed composite flow according to the embodiment of the present invention is a very economical pumping device.

In the above embodiment, the description has been given of the case of the pumping water for sucking the water 50. However, the slurry containing solid matter such as mud and sand can be similarly efficiently discharged and the gas can be sucked. . In the case of slurry discharge, the impeller does not exist in the slurry flow path, so that the performance does not decrease over time. Although the pump 30 has an impeller, only the pumping is performed in the case of slurry discharge, so that the performance does not decrease over time.

FIG. 2 is a configuration diagram of a high-efficiency suction device using a high-speed composite flow according to another embodiment of the present invention.

The high-efficiency suction device using the high-speed composite flow according to the present embodiment is used as a dredging device combining a drilling device and a slurry discharging device. This dredging device is characterized in that the excavator is provided with a two-head composite flow ejection pipe 60 having a structure similar to that of the main pipe 10 in the vicinity of the suction port of the sub pipe 20. Is different.

That is, the composite flow ejection pipe 60 is connected to the main pipe 10.
It is attached to the inside of a reverse cup-shaped skirt 70 which is smaller in diameter and is attached near the suction port of the sub-tube 20. A fourth header 6 corresponding to the first head 13 of the main pipe 10 is provided at an upstream end of the composite flow ejection pipe 60.
1 and a fifth header 62 corresponding to the second head 14 of the main pipe 10 are attached. The fourth header 61 is the first
The fifth header 6 is connected to the pump 30 together with the head 13.
2 is connected to the compressor 40 together with the second header 14 and the third header 21 of the sub pipe 20.

In the high-efficiency suction device using the high-speed composite flow according to the present embodiment, the skirt 70 is opposed to the bottom surface to be dredged. Thereby, the composite flow ejection pipe 60 is inclined and opposes the bottom surface to be dredged. A straight jet stream of water flows through the central portion in the composite flow jet pipe 60 by the fourth header 61, and a swirling jet stream of air flows through the fifth head 62 at the outer peripheral portion. As a result, an extremely strong two-layer flow is injected from the composite flow ejection pipe 60, and the bottom surface is efficiently excavated. The slurry generated by the excavation is efficiently sucked from the sub pipe 20 through the main pipe 10, similarly to the above-described high-efficiency suction apparatus for pumping water.

Thus, the dredging is performed efficiently.

[0035]

As described above, the high-efficiency suction device using the high-speed composite flow according to the present invention functions as a booster system that enhances the capacity of the pump in pumping by combining a straight jet flow and a swirling jet flow. However, even when a relatively small general-purpose pump is used, pumping capacity equivalent to several times the capacity of the general-purpose pump can be obtained without adding or increasing the scale of the pump. be able to. Also, in discharging slurry containing mud, sand, etc., this can be performed economically as well, and the capacity is increased without using an impeller, so that the use does not cause a time-dependent decrease in capacity. It has excellent effects.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a high-efficiency suction device using a high-speed composite flow according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a high-efficiency suction device using a high-speed composite flow according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Main pipe 11 Outer pipe 12 Inner pipe 13 1st header 14 2nd header 20 Sub pipe 21 3rd header 30 Pump 40 Compressor 50 Water 60 Compound flow ejection pipe 61 4th head 62 5th head A Straight jet stream B, C rotation Jet flow

Continuation of the front page (56) References JP-A-9-32033 (JP, A) JP-A 54-109334 (JP, U) JP-A 51-40664 (JP, Y2) (58) Fields investigated (Int) .Cl. ⁷ , DB name) E02F 3/88-3/92

Claims (7)

(57) [Claims] 1. A main pipe equipped with a first header for injecting a liquid into a straight jet stream and blowing it into the center of the pipe, and a second header for converting a gas into a swirling jet stream and blowing it into the outer circumference of the pipe,
A sub-tube for sucking a fluid to be sucked such as a gas, a liquid or a slurry is connected downstream of the first header and the second header, and the inner diameter of the main pipe is reduced downstream of the connection. A high-efficiency suction device using a high-speed composite flow. 2. The high-efficiency suction device using a high-speed composite flow according to claim 1, wherein the first header is connected to an existing general-purpose pump. 3. The high-efficiency suction device according to claim 1, wherein an inner diameter of the sub-tube is smaller than a reduced inner diameter of the main tube. 4. A high-speed composite flow according to claim 1, wherein a third header is provided in the vicinity of the suction port of the sub-pipe to blow gas into the pipe as a swirling jet stream. High efficiency suction device. 5. The high-efficiency suction device according to claim 4, wherein the third header is connected to a common compressor with the second header. 6. In the vicinity of the suction port of the sub-tube, a fourth header is provided which blows a liquid into a central portion in the tube as a straight jet stream, and a fifth header which blows a gas into a peripheral portion inside the tube as a swirling jet stream. The high-efficiency suction device using a high-speed composite flow according to claim 1, 2, 3, 4, or 5, wherein the composite flow ejection pipe is provided as an excavator. 7. The system according to claim 6, wherein the fourth header is connected to a common pump common to the first header, and the fifth header is connected to a compressor common to the second header. A high-efficiency suction device using the high-speed composite flow described in 1.