JP4176923B2 - Jet mixer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a jet mixer for continuously producing a paste by mixing and stirring powder particles with a high-speed jet water flow.
[0002]
[Prior art]
Cement, coal ash, blast furnace slab, lime and other powders and water are mixed and stirred to produce a paste. In addition to the mechanical mixing method using rotating blades, the pipe is called a power tube. There is a jet mixer in which a high-speed jet water stream is passed and powder is added to produce a paste.
[0003]
As shown in FIGS. 8 to 10, the structure of this jet mixer includes a high-pressure pump 1 that generates a jet water flow, a nozzle 2 that generates the jet water flow W, a power tube 3 through which the jet water flow W passes, and powder particles to the power tube 3. A hopper 4 having a body charging port 4a, a storage hopper 5a for the granular material S, a granular material supply facility 5 provided with a screw feeder 5b, a cyclone 6 serving as a container for receiving the paste, and the like.
[0004]
Then, the jet water stream W coming from the rear end side of the power tube 3 sucks the granular material S with a negative pressure (back pressure) as in the case of spraying, and the granular material S and the jet water flow at the inlet 4a of the granular material S W violently collides.
[0005]
The mechanism that enables stirring and mixing with the jet mixer is that the high-pressure jet water is injected into the tube and the energy of the high-pressure water is released at once, so that it becomes very fine sprayed and adheres to the powder particle surface, The turbulent water flow generated in the power tube 3 entrains and agitates the granular material, and the paste spouted from the tip of the power tube 3 collides with the cyclone 6 and adheres to the inner surface of the cyclone 6 and flows in the paste itself. This is because the kneading force (kneading) proceeds by applying a shearing force in the paste itself by the pushing force.
[0006]
[Problems to be solved by the invention]
The jet mixer has a simple structure and has an advantage that it has a structure for continuously producing a paste, but the greatest weak point is that deposits are generated in the power tube 3 and in the vicinity of the granular material inlet 4a. It is a problem. The deposit is a paste that contacts the powder S and water and remains on the inner surface of the pipe. The cause of the deposit is roughly divided into a negative pressure phenomenon caused by the jet water flow W and a deposition phenomenon of the powder S due to gravity. it can. Moreover, the main site | parts where a deposit | attachment generate | occur | produces are the nozzle 2 vicinity (code | symbol A of FIG. 8), the granular material inlet 4a, the contact (code | symbol B of FIG. 8) of the power tube 3, and the granular material inlet 4a. It is below (reference C in FIG. 8).
[0007]
The reason why the deposits are generated in the vicinity A of the nozzle 2 is generated by causing the negative pressure generated by the jet water flow W to be generated in the vicinity of the nozzle 2 and causing the charged granular material S to flow backward in the nozzle 2 direction. The reason why the deposits are generated at the contact B of the granular material inlet 4a and the power tube 3 is that the water droplets adhere to the contact points of the granular material inlet 4a and the power tube 3 by diffusing near the granular material inlet 4a. Then, the granular material S comes into contact with this, and deposits are formed, which gradually expands and narrows the granular material inlet 4a, creates a negative pressure in the same place, sucks up the jet water stream W, and further deposits grow. It occurs when you follow.
[0008]
Further, the cause of the occurrence of deposits in the lower part C of the granular material inlet 4a is caused by the charged granular material not being able to ride over the jet water flow W and being deposited and deposited downward by the action of gravity.
[0009]
The present invention has been made in view of the above circumstances, and can prevent the deposit from growing or prevent the deposit from growing in a relatively simple manner. An object of the present invention is to provide a jet mixer capable of continuously and stably producing a paste having a desired quality.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the jet mixer of the present invention allows a high-pressure jet water stream injected from a nozzle to pass from the rear end portion to the front end portion in the power tube, and is generated in the power tube by the high-pressure jet water flow. The granular material charged into the power tube is drawn from the granular material inlet by negative pressure, and the granular material and water are stirred by colliding the drawn granular material against the inner wall surface of the cyclone at the tip of the power tube. In the jet mixer, which is mixed to obtain a paste having a desired water / powder particle ratio, the nozzle has a part of a high-pressure jet water flow from the nozzle at the rear end of the power tube rather than the powder inlet. It was set as the structure which injects with respect to the inner wall face near a part.
[0011]
According to the present invention, a part of the high-pressure jet water flow from the nozzle is sprayed onto the inner wall surface closer to the rear end of the power tube than the powder inlet, including the region where deposits are generated. A paste can be continuously produced while constantly sweeping the inner surface of the power tube with a high-pressure jet water flow. Thereby, it is possible to prevent deposits from sticking by a relatively simple method, or to prevent the deposits from growing, and to improve the paste production efficiency and to produce a paste of the desired quality continuously and stably. Can be [0012]
Here, the high-pressure jet water stream ejected from the nozzle may have an ejection pattern that extends larger than the inner diameter of the power tube at a position closer to the rear end portion of the power tube than the granular material inlet. . If it does in this way, the removal method of a deposit | attachment and the growth prevention effect can be more effectively exhibited with the simple method of considering the injection pattern of a high-pressure jet water stream.
[0013]
Also, there may be a plurality of the nozzles, and a high-pressure jet water stream ejected from a part of the nozzles may be ejected to the inner wall surface closer to the rear end portion of the power tube than the powder inlet. . In this way, with a simple configuration in which the orientation of some of the plurality of nozzles that inject the high-pressure jet water stream is changed, it is possible to efficiently exert the effect of removing deposits and preventing growth. it can.
[0014]
Moreover, it can also be set as the structure which provided the granular material removal apparatus for removing the granular material adhering to the inner surface inside the said granular material insertion port. According to this, since the granular material does not adhere to the inside of the granular material charging port, it becomes possible to increase the efficiency of paste production and to manufacture a paste of the desired quality continuously and stably.
[0015]
Further, negative pressure reducing means for reducing the negative pressure generated in the power tube near the nozzle and in the vicinity of the powder inlet is provided, and the negative pressure phenomenon means communicates the inside of the power tube near the nozzle with the outside air. It is also possible to adopt a structure in which the inside of the granular material inlet is communicated with the outside air. In this way, the granular material thrown into the power tube does not flow backward in the nozzle direction and is difficult to adhere, and the jet water stream is not sucked up to the granular material inlet side. Kimono growth can be prevented.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings. The same components as those shown in FIGS. 8 to 10 are denoted by the same reference numerals, and the description thereof will be simplified.
[0017]
FIG. 1 shows the structure of the power tube 3 in the vicinity of the nozzle 2 of the jet mixer according to this embodiment and in the vicinity of the granular material inlet 4a.
[0018]
The rear end portion 3a of the power tube 3 facing the nozzle 2 extends to the nozzle 2 side from the powder fluid inlet 4a, and an end plate 10 is provided at the rear end portion 3a. The end plate 10 is provided with holes for allowing the high-pressure jet water flow from the nozzle 2 to pass therethrough.
[0019]
The nozzle 2 is disposed with a gap L of about 10 mm between the end plate 10 and the nozzle support plate 11. A specific configuration of the nozzle 2 will be described later.
[0020]
A vertical tube 17 that communicates with the inside of the power tube 3 is disposed below the powder body inlet 4a. A cylindrical tube 22 having an outer diameter slightly smaller than the inner diameter of the vertical tube 17 is inserted into the vertical tube 17. As shown in FIG. 2, a plurality of through holes 22 a are formed in the cylindrical tube 22 at predetermined intervals in the circumferential direction, and edges extending in the axial direction of the through holes 22 a The cutting blade 22b scrapes off the granular material S adhering to the part opening 20.
[0021]
A ring-shaped gear 24 having a hole through which the powder fluid S passes is fixed to the upper opening of the cylindrical tube 22, and a drive gear 28 connected to the drive shaft 26 a of the drive motor 26 is attached to the gear 24. Are engaged. When the drive gear 28 is rotated by driving the drive motor 26, the rotational force is transmitted to the gear 24 so that the cylindrical tube 22 rotates in the vertical tube 17. The cylindrical tube 22, the gear 24, the drive motor 26, and the drive gear 28 correspond to the powder particle removing device of the present invention, and the gear 24, the drive motor 26, and the drive gear 28 correspond to the moving mechanism of the present invention. .
[0022]
The nozzle 2 is specially devised as shown in FIGS. In these drawings, the conventional nozzle is shown in each figure (a) and the present nozzle is shown in each figure (b) so that the conventional nozzle and the nozzle according to the present embodiment can be easily compared. The nozzle which concerns on a form is illustrated.
[0023]
There are a case where a plurality of nozzles 2 for high-pressure jet water flow and a case where one nozzle 2 is arranged. In the present embodiment, an example in which a plurality (seven) are arranged is shown. As shown in FIG. 3B, one nozzle 2 is arranged at the center of the surface of the nozzle holding board 12, and six nozzles are arranged at equal intervals around the nozzle.
[0024]
The high-pressure jet water stream ejected from the nozzle 2 is considered to have a certain ejection pattern. Specifically, by providing the ejection pattern guide groove 13 as shown in FIG. 4B on the outlet side of each nozzle 2, the jet pattern P1 of the jet water flow ejected from each nozzle 2 is shown in FIG. As shown in (b), consideration is given to spreading in an elliptical shape. In that case, as shown in FIG.1 and FIG.6 (b), a part of high-pressure jet water flow from each nozzle 2 is to the inner wall surface 3b near the rear-end part 3a of the power tube 3 rather than the granular material inlet 4a. In contrast, it is set to inject.
[0025]
Thus, a region where deposits are generated by injecting a part of the high-pressure jet water flow from each nozzle 2 toward the inner wall surface 3b closer to the rear end of the power tube 3 than the granular material inlet 4a. The inner surface of the power tube is constantly swept by the high-pressure jet water flow. Thereby, it is possible to prevent the deposits from sticking or to prevent the deposits from growing. In this regard, conventionally, as shown in FIG. 6A, the jet water flow hardly collides with the inner surface of the power tube 3 in the vicinity of the powder fluid inlet 4a, so that no sweep can be formed.
[0026]
Here, as the injection pattern P1 of the high-pressure jet water stream injected from the nozzle 2, an injection pattern that spreads larger than the inner diameter of the power tube 3 at a position closer to the rear end of the power tube 3 than the granular material inlet 4a. The high-pressure jet water stream ejected from some of the nozzles 2 may be ejected to the inner wall surface 3b closer to the rear end of the power tube 3 than the granular material inlet 4a. You can also. When the latter method is adopted, it is possible to efficiently remove deposits and prevent growth with a simple configuration in which the orientation of some of the plurality of nozzles 2 that inject the high-pressure jet water flow is changed. Obtainable.
[0027]
If this concept is adopted, for example, it is possible to adopt a configuration in which a part of the nozzle 2 is directed only to a region where the deposits are likely to be attached, and therefore it is possible to take a local deposit removal measure. Thereby, it can be set as the efficient countermeasure against adhering matter without waste.
[0028]
According to the jet mixer having the above configuration, even when the jet water flow W is ejected from the nozzle 2, the outside air flows into the power tube 3 near the nozzle 2 from the gap L provided between the nozzle 2 and the end plate 10. 2, almost no negative pressure is generated in the vicinity of the nozzle 2, so that the powder S injected into the power tube 3 does not flow backward toward the nozzle 2, and the powder S is formed on the rear end side 3 a of the power tube 3 near the nozzle 2. It becomes difficult to adhere.
[0029]
Even if the powder S adheres to the inner surface of the rear end side 3a of the power tube 3, it is easily removed by the action of the high-pressure jet water flow having the jet pattern P1 (sweeping), and the deposit grows. Absent.
[0030]
Moreover, even if the granular material S that could not get through the jet water flow W settles and deposits on the inner surface of the power tube 3 below the granular material inlet 4a, the high pressure having the injection pattern P1 is the same as described above. It can be easily removed by the action of the jet water stream (sweeping) and sucked into the jet water stream W again.
[0031]
On the other hand, since the outside air flows from the vent hole 18 formed in the vertical pipe 17 to the lower end of the vertical pipe 17 and the connection opening 20 of the power tube 3, there is almost no negative pressure in the vicinity of the connection opening 20. Since the water flow W is not sucked up, it is possible to prevent the deposits of the granular material S from growing.
[0032]
Even if the granular material S adheres to the connection opening 20, the cylindrical tube 22 is rotated in the vertical tube 17 through the drive gear 28 and the gear 24 by driving the dynamic motor 26, thereby The granular material S to which the cutting blade 22b is attached can be easily scraped off.
[0033]
Therefore, since the jet mixer of this embodiment can prevent the deposit | attachment of the granular material S from attaching to the inner surface of the power tube 3 or the connection opening part 20, or can prevent the growth of a deposit | attachment, It is possible to continuously and stably produce a paste with improved efficiency and desired quality.
[0034]
Various injection patterns of the high-pressure jet water flow are conceivable. For example, as shown in FIG. 7, the injection pattern guide groove 13 is formed in a cross shape, and the elliptical injection pattern P1 is also formed in a cross shape. It may be formed. In this way, since the injection pattern P1 can be expanded in an up / down / left / right direction, it is possible to reduce the need to consider the direction of the nozzle.
[0035]
Moreover, in the said embodiment, although the example which provided the inlet 18 in the surrounding wall of the vertical pipe 17 was shown as a negative pressure reduction means of a granular material inlet, instead of providing the inlet 18, a granular material injection | throwing-in was carried out. A configuration may be adopted in which an air intake gap is provided between the mouth 4a and the gear 24. In this way, an air flow that passes through the cylindrical tube 22 in the vertical tube 17 and into the power tube 3 through the gap can be formed.
[0036]
【The invention's effect】
As described above, according to the present invention, it is possible to prevent deposits from growing or prevent the growth of deposits by a relatively simple method, thereby improving the efficiency of paste production and the desired quality. It is possible to provide a jet mixer capable of continuously and stably producing the paste.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing the structure of a power tube in the vicinity of a nozzle of a jet mixer according to the present invention and in the vicinity of a powder particle inlet.
2 is a cross-sectional view taken along line II-II in FIG.
FIG. 3 is a front view showing an arrangement relationship of nozzles.
FIG. 4 is an enlarged front view showing a configuration of a nozzle.
FIG. 5 is a front view showing an injection pattern of a high-pressure jet water flow from a nozzle.
FIG. 6 is a conceptual diagram showing an injection pattern in a power tube of a high-pressure jet water flow.
FIG. 7 is a front view showing an injection pattern of a high-pressure jet water stream.
FIG. 8 is an overall configuration diagram of a conventional jet mixer.
FIG. 9 is a plan view of a conventional jet mixer.
10 is a cross-sectional view taken along line VI-VI in FIG.
[Explanation of symbols]
2 Nozzle 3 Power tube 3a Power tube rear end 3b Power tube inner wall surface 4 Hopper
4a Granule inlet 6 Cyclone 10 End plate 11 Support plate 12 Nozzle holding plate 13 Injection pattern guide groove 17 Vertical pipe 18 Intake hole 22 Cylindrical pipe 22a Through hole 22b Cutting blade 24 Gear 26 Drive motor 26a Drive shaft 28 Drive Gear S Granule W Jet water flow P1 Injection pattern

Claims (5)

The high-pressure jet water stream injected from the nozzle is passed from the rear end of the power tube toward the tip, and the negative pressure generated in the power tube by the high-pressure jet water flow is introduced into the power tube from the granular material inlet. The powder and the water are agitated and mixed by colliding the drawn powder and colliding the drawn powder with the inner wall surface of the cyclone at the tip of the power tube to obtain a desired water / powder ratio. In a jet mixer
The nozzle is configured to inject a part of the high-pressure jet water flow from the nozzle onto the inner wall surface closer to the rear end of the power tube than the powder inlet. 2. The jet pattern according to claim 1, wherein the high-pressure jet water stream ejected from the nozzle spreads larger than the inner diameter of the power tube at a position closer to a rear end portion of the power tube than the powder and particle inlet. A jet mixer characterized by comprising: 3. The jet mixer according to claim 1, wherein there are a plurality of the nozzles, and a high-pressure jet water stream ejected from a part of the nozzles is an inner wall surface closer to a rear end portion of the power tube than the granular material charging port. A jet mixer that is configured to inject fuel. The jet mixer according to any one of claims 1 to 3, further comprising a powder particle removing device for removing the powder particles adhering to the inner surface of the powder particle inlet. A jet mixer. The jet mixer according to any one of claims 1 to 4, further comprising negative pressure reducing means for reducing negative pressure generated in the power tube near the nozzle and in the vicinity of the powder inlet, wherein the negative pressure phenomenon means is A jet mixer characterized in that the inside of the power tube in the vicinity of the nozzle communicates with the outside air, and the inside of the powder and granular material inlet communicates with the outside air.

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