JPH05245355A - Multi-nozzle jet pump and method for shortening the total length of jet pump - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To shorten the overall length of the jet pump so that it can be miniaturized and to allow good agitation and mixing of powders and fluids. A high-pressure fluid pressurized by a fluid pressurizing means 15 is jetted from a plurality of jet nozzles 9 into a discharge pipe 8, and this jet flow gradually spreads downstream and is discharged as a united body. When it spreads to the inside of the pipe, a negative pressure is formed in the discharge pipe on the upstream side of the jet from this spread point. When the agitation and mixing of the powder and the fluid are mixed with this negative pressure, the powder 2 and the fluid are sucked from the suction pipe 3 and agitated and mixed by the discharge pipe.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for sucking fluids containing snow and solids and powders for feeding, and for agitating, mixing, dissolving and kneading gas and powders into liquids. It relates to a jet pump used.

[0001]

2. Description of the Related Art As a jet pump of this kind, for example, in addition to Japanese Patent Publication No. 62-12400, many inventions previously proposed by the inventor of the present application are known and widely used. By the way, these basic configurations are provided with a single injection nozzle for injecting a high-pressure fluid at the bottom of a discharge pipe formed in a cylindrical or diffuser shape.
When the jet flow jetted from this jet nozzle spreads in the discharge pipe as much as possible, a negative pressure is generated in the discharge pipe on the upstream side of the jet flow, and this negative pressure causes a fluid and powder containing snow and solids from the suction port. It is configured so as to form a negative pressure for sucking and sending the body and for agitating, mixing, dissolving and kneading gas or powder in the liquid.

[0002]

In the above-mentioned conventional jet pump, when powder such as pulverized coal or snow is sucked from the suction port and sent through the discharge pipe by jet flow, the powder itself Is easily attached to the inner peripheral surface of the discharge pipe, and when the powder comes into contact with the jet flow, the water content in the powder is carried away by the strong jet flow. The powder 200 is firmly adhered and deposited on the surface. As a result, there has been a problem that the passage cross-sectional area in the discharge pipe 100 is reduced at an early stage and the delivery efficiency is significantly reduced.

In view of such a problem, in the conventional jet pump, in order to form a large amount of strong negative pressure, the velocity of the jet stream jetted from the jet nozzle toward the discharge pipe is high, and the diameter of the discharge pipe is set to be large. It is composed of a large diameter. However, when the velocity of the jet flow is high, the divergence angle on the downstream side of the jet flow is small, so the above-mentioned conventional discharge pipe is configured with a considerably long pipe length, and the entire device becomes large-scale. There is also the problem of being lost. Therefore, there is a problem that the jet pump having such a structure cannot be mounted on a vehicle or the like for movement or cannot be a portable one, and there is a problem that a place for implementing the jet pump is significantly limited. It was

[0004] In recent years, from the economical efficiency as a fuel for thermal power generation, it has been researched to pulverize coal and mix it with a liquid such as water to make it into a fluid and burn it. Generally, pulverized coal is used as water or the like. The problem is that it is impossible to improve the economic efficiency of the coal because it does not adapt well to the above, and finely divided coal or liquid mixed with it is subjected to various chemical treatments for easy separation. There was also. The present invention has been proposed in view of the above problems, and an object of the present invention is to provide a jet pump and a method for shortening the total length of a jet pump that can form a large amount of high negative pressure while being compact. It is a thing.

[0005]

In order to achieve the above object, a multi-nozzle type jet pump according to the present invention firstly pressurizes a fluid by a fluid adding means and jets a pressurized high pressure fluid. A basic feature is that a plurality of nozzles are arranged substantially concentrically toward a discharge pipe arranged in front of the nozzle, and a suction port is provided between the discharge pipe and the injection nozzle. ..

Next, a plurality of injection nozzles, which pressurize the fluid by the fluid adding means and inject the pressurized high-pressure fluid, are arranged substantially concentrically toward the discharge pipe arranged in front of it. A suction port is provided between the discharge pipe and the injection nozzle, and at least a part of the discharge pipe is a plurality of cylinders corresponding to the injection nozzle, and each discharge port is a substantially concentric cylinder. It is characterized by being formed.

Further, each of the injection nozzles is formed by an injection port and a gas mixture forming pipe arranged concentrically in front of the injection port, and a suction port is provided between the gas mixture forming pipe and the discharge pipe, and the injection is performed. An intake port is provided between the port and the mixture forming tube protection member, and the gas sucked from the intake port is mixed with the jet stream injected from the injection port to the mixture forming tube to form a mixture jet flow. The air-fuel mixture jet flow is configured to be jetted from the air-fuel mixture forming pipe to the discharge pipe.

Further, the present invention is characterized in that the suction port is opened toward the sending powder and the sending powder adhesion preventing injection nozzle is arranged along the peripheral wall of the discharge pipe. in addition,
It is also characterized in that the suction port is opened toward the powder or fluid for stirring or kneading, and the fluid for stirring or kneading the powder or fluid for stirring is jetted from the jet nozzle. Is.

A method of shortening the total length of a jet pump is to inject high-pressure fluid pressurized by a fluid pressurizing means from a plurality of injection ports of an injection nozzle toward a large-diameter discharge pipe. Each of the jet streams of No. 1 was expanded in the discharge pipe and coalesced to expand to the full extent in the discharge pipe, or in the case where a discharge pipe was provided in front of a plurality of injection ports corresponding to each injection port, it was injected from each injection port. Characterized by shortening the distance from the injection nozzle to the position where the jet pipes fully fill the inside of the discharge pipes by forming a negative pressure in the discharge pipes upstream of the jet flows. Is.

[0010]

When the high pressure fluid pressurized by the fluid pressurizing means is jetted from the plurality of jet nozzles toward the discharge pipe, the jet streams gradually spread at the same spread angle, and the jet streams Of the jet flow ejected from each jet nozzle when the jet pipes corresponding to each jet nozzle are provided in front of a plurality of jet nozzles. When the discharge pipe is fully expanded, a negative pressure is formed in the discharge pipe on the upstream side. Then, even when the jet flow has strong momentum and the spread angle is small, the spread angles of the jet flows jetted from the plurality of jet nozzles are summed up,
The distance from the injection nozzle to the position where it fully spreads in the discharge pipe is greatly shortened.

The negative pressure thus formed in the discharge pipe is taken out from the suction port to suck and send the fluid and the powder containing the snow and the solid mass, and the gas and the powder are stirred and mixed with the liquid.・ It is used for melting and kneading,
The gas jet is injected from the injection nozzle to the air-fuel mixture forming tube and the gas is mixed from the intake port to form the air-fuel mixture jet flow.
In the case where this mixture gas jet flow is ejected from the mixture gas formation pipe to the discharge pipe, the mixture air jet flow discharged from the mixture gas formation pipe to the discharge pipe tends to be attenuated in the discharge pipe. The effect of the gas mixed in the jet stream prevents the damping, so that a strong negative pressure is formed in the discharge pipe.

In the case where the suction port is opened toward the delivery powder, the delivery powder sucked from the suction port adheres to or tends to adhere to the inner peripheral surface of the discharge pipe. This is prevented by the jetting nozzle for preventing the adhesion of the powder for sending, which is arranged along the peripheral wall of the discharge pipe. Further, in the case where the suction port is opened toward the stirring or kneading powder or fluid, and the fluid for stirring or kneading the kneading powder or fluid is jetted from the jet nozzle, Since it is vigorously stirred by a strong jet flow, the kneading powder or fluid is agitated or the fluid for kneading is agitated / mixed / dissolved and kneaded.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a multi-nozzle jet pump and a method for shortening the total length of a jet pump according to the present invention will be described below with reference to the drawings. <Example 1> [Refer to FIG. 1 to FIG. 3] FIG. 1 shows a plurality of nozzles for sucking powders such as the snow 2 on the roof 1 and the snow 2 snowed off through a suction duct 3 and sending the powder. 1 shows a schematic configuration of a jet jet pump, and reference numeral 4 in the figure generally indicates a multi-nozzle jet pump. This jet pump 4 has a cylindrical discharge pipe 8 formed by connecting two large and small pipe materials 5 and 6 with a flange portion 7, and a plurality of injection nozzles 9 formed at the end of the small diameter pipe material 6. 9 ・ 9
... and a fluid pressurizing means 10 for supplying a high-pressure fluid to the plurality of injection nozzles 9, 9 ...
······································ s side with the suction port 11.

The fluid pressurizing means 10 has a water tank 13 in which water 12 is stored, a pressure pump 15 for sucking the water 12 in the water tank 13 through a strainer 14 and then pressurizing the water 12, and a pressure pump 15. The pressure water supply passage 20 is configured to supply the high pressure water whose pressure has been increased by the pressure water inlet pipe 16 to the pressure chamber 17. The plurality of injection nozzles 9, 9, 9 ... Are provided in a nozzle forming member 24, which will be described later, as shown in FIGS. 2 and 3, and have a small diameter in which the pressure chamber 17 side is expanded into a bell mouth shape. It is formed by the injection port of. In the nozzle forming member 24, the large-diameter cylindrical casing 21 is attached to the end of the pipe member 6 forming the discharge pipe 8, and the nozzle forming member attachment opening 22 is provided in the rear end surface 21 a of the cylindrical casing 21. At the same time, it is sandwiched and fixed between the mounting opening 22 and the inlet pipe forming member 23 mounted outside thereof.
The suction port 11 is connected to the upper portion of the cylindrical casing 21.

Next, the operation of the multi-nozzle type jet pump 4 constructed as described above will be explained. First, the water 12 in the water tank 13 is driven by the strainer 1 by driving the pressurizing pump 15.
After being sucked through 4 and raised in pressure, the pressure water supply passage 20
And to the pressure chamber 17 via the pressure water inlet pipe 16.
The high-pressure water supplied to the pressure chamber 17 is jetted toward the pipe member 6 forming the discharge pipe 8 from each of the plurality of jet nozzles 9, 9, ... In this way, each injection nozzle 9, 9, 9 ...
The jet streams J jetted from the jets gradually spread at the same spread angle (α). Then, from the point where the jet stream J jetted from the plurality of jet nozzles 9, 9, 9 ... gradually spreads in the pipe material 6 and is completely integrated with each other in the discharge pipe (A in the figure). A negative pressure is formed inside the pipe member 6 upstream of the jet stream J.

Here, in order to make the negative pressure generated inside the pipe material 6 and the pipe material 5 strong, when the force of the jet flow J is increased, the jet flow J inside the pipe material 6 and the pipe material 5 is correspondingly increased. The divergence angle (α) becomes smaller and the sphere flies far, but when the flight distance of the jet stream J is long, the point (A in the figure) where the jet flow J fully spreads may be on the pipe material 5 side. Even in such a case, the jet flow J jetted from the plurality of jet nozzles 9, 9, 9 ... Is in a state in which the spread angles (α) are summed up.
The flight distance (L) from the position 9 ... (B in the figure) to the position (A above) where the discharge pipe 5 (tubular material 2) is fully expanded, the jet flow is jetted from a single jet nozzle. It is much shorter than the flight distance of a jet pump with a structure. By the way, the flight distance (L) of this jet J
Is automatically changed according to the negative pressure generated in the pipe members 5 and 6 when the negative pressure is high and short and when the negative pressure is low.

When the negative pressure thus generated in the pipe members 5 and 6 is applied to the snow 2 of the roof 1 or the snow 2 which has been snowed from the suction port 11 of the cylindrical casing 21 through the suction duct 3, these negative pressures are generated. Snow 2 is drawn from the suction port 11 to the cylindrical casing 2
1 is sucked into the negative pressure chamber 25 formed inside the pipe material 5,
It is sent in the inside of 6. At this time, the snow 2 sent in the pipes 5 and 6 adheres to the inner peripheral surface of the pipes 5 and 6 or tries to adhere thereto, and the snow 2 is arranged along the vicinity of the peripheral wall of the pipes 5. The partial spray nozzles 9, 9, 9 ... Work as spray nozzles for preventing the adhesion of powder for spraying. The snow 2 that adheres to or is about to adhere to the inner peripheral surface of the is peeled off and blown off.

<Embodiment 2> (See FIGS. 4 to 6) A multi-nozzle jet pump 4 according to this embodiment is
This is a case where a water-insoluble powder such as coal is stirred and mixed with a liquid such as water to form a fuel for thermal power generation. As shown in FIGS. 4 to 6, the multi-nozzle jet pump 4 of the present example is concentric with a small-diameter tubular body 25, 25, corresponding to each of the plurality of injection nozzles 9, 9 ,. 25.
.. are provided, and the small-diameter cylindrical bodies 25, 25, 25, ... Are gathered to form the pipe material 6 of the discharge pipe 8, and the jet flow J jetted from the jet nozzles 9, 9, 9. Is configured as a mixed air jet flow. That is, in the structure for forming the mixed jet flow, first, the cylindrical casing 2
A cylindrical nozzle holder 26 having a diameter smaller than that of the pipe material 6 is provided at the rear end of the inlet pipe forming member 2
7 and the two holder plates 28 and 29 are fixed with a space therebetween, and the inlet pipe forming member 27 and the holder plate 28 are fixed.
The pressure chamber 17 between the two holder plates 28.
Gas introducing chambers 30 are formed between the gas introducing chambers 9 and an intake pipe 32 provided with a metering valve 31 is connected to the gas introducing chambers 30.

Next, the above two holder plates 28-2
A bullet type air-fuel mixture jet forming member 33 is supported over the space 9 and the pressure chamber 17 is provided inside the air-fuel mixture jet forming member 33.
A small-diameter injection port portion 34 whose side is expanded into a bellmouth shape and a mixture-air forming passage portion (mixture-forming tube) 35 having a larger diameter than the injection port are integrally provided in front of the injection port portion 34, and An intake inlet 36 is provided in a portion of the formation passage 35 near the injection port so as to communicate with the gas introduction chamber 30, and the injection nozzles 9
9 ... is configured. The suction port of the suction duct 3 connected to the suction port 11 of the cylindrical casing 21 is opened toward the pulverized coal 38 of the pulverized coal storage tank 37, and the discharge port of the discharge pipe 8 is in the fuel storage tank 39. It is opened toward.

In the case of the present embodiment, when the jet flow injected from the small-diameter jet port portion 34 spreads to the full in the air-fuel mixture forming passage portion 35, the air-fuel mixture forming passage portion 3 on the side of the jet port is formed.
A negative pressure is formed at 5. Next, with this negative pressure, the intake inlet 36
Since the gas in the gas introduction chamber 30 is sucked from the above and mixed with the jet flow in the mixture forming passage portion 35, the injection nozzle 9
・ From 9 ・ 9 ・ ・ ・ Small diameter cylinders 25 ・ 25 ・ 25 ・ ・ ・
The jet flow jetted into is a mixed air jet flow containing gas inside. This mixture jet has a small diameter cylinder 2
5 ・ 25 ・ 25 ・ ・ ・ Spraying inside 9 ・ 9 ・
Negative pressure is generated in each of the cylindrical bodies 25, 25, 25 ... on the 9 ... side, and the negative pressure is merged in the negative pressure acting space 40 in the cylindrical casing 21 to act on the suction port 11. To do. The negative pressure acting on the suction port 11 acts on the suction port through the suction duct 3 to suck the pulverized coal 38 in the pulverized coal storage tank 37 into the negative pressure acting space 40, and from here, the respective cylinders 25, 25.2
5 is aspirated, agitated and mixed with the air-fuel mixture jet flow, and discharged from the discharge port of the discharge pipe 8 into the fuel storage tank 39.

By the way, when the present applicant kneads fine coal powder and water with the apparatus of this embodiment, what is discharged from the discharge port of the discharge pipe 8 into the fuel storage tank 39 is as if dissolved by the solvent. It was a slurry-like liquid. this is,
When coal fines come into contact with a jet stream with strong force and are mixed and transported, they are ultrafinely powdered to the extent that cannot be achieved by mechanical atomization, and the surface of the ultrafine coal particles is strong. It is thought that it is due to the reforming by the jet flow.

In each of the above embodiments, the cylindrical casing 2 is used.
Although the suction port 11 is provided in the upper part of 1, the suction port 11 may be provided at a plurality of places as shown in FIG. 7, for example. Further, as shown in FIG. 7, the structure for forming the air-fuel mixture jet flow in the second embodiment is in a state in which the injection port portion 34 and the air-fuel mixture forming passage portion 35 are separated, or a separate air-fuel mixture forming tube May be concentrically provided in front of the injection port, and the method of shortening the total length of the multiple nozzle type jet pump and the jet pump of the present invention is not limited to the above-mentioned respective embodiments, and powder feeding may be performed. It goes without saying that it can also be used for mixing powder and liquid and for supplementing adsorption of gas. Furthermore,
In each of the above-mentioned embodiments, the discharge pipe is made of two large and small pipes, but it goes without saying that this can be made of one pipe.

[0023]

As described above, according to the multi-nozzle jet pump and the method for shortening the total length of the jet pump according to the present invention, powder such as pulverized coal or snow is sucked from the suction port, When the powder is sent by a jet stream, the powder itself easily adheres to the inner peripheral surface of the discharge pipe, and when the powder comes into contact with the jet stream, the water content in the powder is carried away by the strong jet stream. Even if the powder adheres to and deposits on the inner peripheral surface of the discharge pipe, the injection nozzles for preventing powder adhesion are arranged along the peripheral wall of the discharge pipe among the plurality of injection nozzles. It prevents the powder from adhering and depositing hard by the jet stream jetted from. This has the advantage that the passage cross-sectional area in the discharge pipe can always be kept large, the durability of the jet pump can be improved, and continuous operation can be made possible over a long period of time.

Further, when the jet streams jetted from the jet nozzles gradually spread and are completely united with each other to fully fill the discharge pipe, or in front of a plurality of jet nozzles, the jet nozzles are discharged corresponding to the jet nozzles. In the case where the pipe is provided, when the jet flow injected from each injection port spreads to the inside of each discharge pipe, a negative pressure is generated in the discharge pipe on the upstream side,
Even if the jet flow is strong and spreads at a small angle,
The spread angles of the jet streams jetted from the plurality of jet nozzles are summed up, and the distance from the jet nozzle to the position where the jet pipe is fully spread can be greatly shortened. As a result, the length of the discharge pipe can be shortened to make the entire jet pump compact, and the jet pump can be mounted on a vehicle or the like for movement or made portable to further expand its usefulness. There is an advantage that you can.

Moreover, in the case where the suction port is opened toward the powder or fluid for stirring or kneading, and the fluid for stirring or kneading the powder or fluid for stirring is jetted from the jet nozzle, Since the powder or fluid for mixing is vigorously and finely stirred by the powerful jet flow from the injection nozzle, the powder or fluid for kneading is sufficiently stirred, mixed, dissolved and kneaded. As a result, for example, when coal is pulverized as a fuel in thermal power generation and mixed with a liquid such as water and is made into a fluid and burned, the pulverized coal can be sufficiently adapted to water and the like, and its economic efficiency is improved. Has the advantage that it can be sufficiently improved.

[00026]

[Brief description of drawings]

FIG. 1 is a side view showing a schematic configuration according to the first embodiment when a multi-nozzle jet pump is used for sending snow.

FIG. 2 is an enlarged view of a nozzle portion of the jet pump of FIG.

3 is a sectional view taken along line XX of FIG.

FIG. 4 is a side view showing a schematic configuration according to the second embodiment when a multi-nozzle jet pump is used to atomize coal and mix it with a liquid such as water.

5 is an enlarged view of a nozzle portion of the jet pump of FIG.

FIG. 6 is a sectional view taken along line YY of FIG.

FIG. 7 is a sectional view showing a modified example of a nozzle portion of a jet pump.

FIG. 8 is a vertical cross-sectional side view of a single nozzle jet pump according to a conventional example.

[00028]

[Explanation of symbols]

 4 ... Plural nozzle type jet pump, 8 ... Discharge pipe, 9 ... Injection nozzle, 10 ... Fluid pressurizing means, 11 ... Suction port, 25 ... Cylindrical body, 35 ...・ Mixture forming tube,

Claims (6)

[Claims] 1. A plurality of injection nozzles, which pressurize a fluid by a fluid adding means and inject a pressurized high-pressure fluid, are arranged substantially concentrically toward a discharge pipe arranged in front of the injection pipe. A multi-nozzle jet pump characterized in that a suction port is provided between the discharge pipe and the injection nozzle. 2. A plurality of injection nozzles, which pressurize the fluid by a fluid applying means and inject the pressurized high-pressure fluid, are arranged substantially concentrically toward a discharge pipe arranged in front of the injection nozzle. , A suction port is provided between the discharge pipe and the injection nozzle, and the discharge pipe is a plurality of pipes at least a part of which corresponds to the injection nozzle,
A multi-nozzle jet pump characterized in that each jet nozzle is formed of a cylindrical body provided substantially concentrically. 3. Each of the injection nozzles is formed by an injection port and a gas mixture forming pipe arranged concentrically in front of the injection port, and a suction port is provided between the gas mixture forming pipe and the discharge pipe, and the injection is performed. An intake port is provided between the port and the mixture forming tube protection member, and the gas sucked from the intake port is mixed with the jet stream injected from the injection port to the mixture forming tube to form a mixture jet flow. The multi-nozzle jet pump according to claim 1 or 2, wherein the mixed air jet flow is configured to be jetted from the mixed gas forming pipe to the discharge pipe. 4. The suction port is opened toward the powder for delivery, and the injection nozzle for preventing attachment of the powder for delivery is arranged along the peripheral wall of the discharge pipe. The multi-nozzle jet pump according to claim 3. 5. A structure in which the suction port is opened toward the powder or fluid for stirring or kneading, and a fluid for stirring or kneading the powder or fluid for stirring is jetted from an injection nozzle. Claims 1 to 3 characterized by
A multi-nozzle jet pump according to any one of 1. 6. A high-pressure fluid pressurized by a fluid pressurizing means is jetted from a plurality of jet ports of a jet nozzle toward a large-diameter discharge pipe, and each of the plurality of jet streams is expanded in the discharge pipe. To expand the discharge pipe to the full extent, or in the case where a plurality of discharge pipes are provided in front of the jet ports, the jet flow injected from each jet port spreads to the full inside of the discharge pipe. A method for shortening the total length of a jet pump, characterized in that a negative pressure is formed in the discharge pipe on the upstream side so that the distance from the injection nozzle to the position where the discharge pipe is fully expanded is shortened. [00001]