JP2017023911A - Spray nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology capable of suppressing dispersion of mixing of powder and liquid.SOLUTION: A spray nozzle 2 includes a mixing transfer pipe 30 arranged on the downstream side of a liquid supply part 10, and provided with a mixing route 31 linked to a passage 12 of the liquid supply part 10. The liquid supply part 10 has, in the passage 12 partitioned by a peripheral wall 11, a discharge pipe 20 provided with a plurality of discharge holes 21 for discharging a liquid to be mixed with powder flowing along the passage 12 into the passage 12 separately from the peripheral wall 11.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a spray nozzle, and more particularly to a technique effective when applied to a spray nozzle used in a dry spray method.

In the dry spraying method, the powder (dry powder material) created at a position away from the construction position is conveyed to the construction position by airflow, and the powder and liquid (for example, water) are sprayed at the spray nozzle installed at the construction position. This is a method of kneading and spraying. This dry-type spraying method is used for spraying concrete, mortar, fireproof coatings, etc. in the civil engineering field, building field, or in the building and chimney building fields such as steelmaking, refining, petroleum refining related furnaces and incinerators. Yes.
In this dry spraying method, powder is instantaneously kneaded with a liquid and sprayed, so that the kneadability between the powder and the liquid tends to vary. The variation in kneadability is a factor in reducing the quality of the sprayed kneaded material. Further, the rebound between the dust and the aggregate becomes severe due to the kneading variation, which causes a deterioration in the working environment and an increase in cost due to an increase in spraying loss due to a decrease in the adhesion rate of the kneaded material. Therefore, in the dry-type spraying method, how to uniformly knead the powder and liquid is a technical problem.

  Patent Document 1 discloses a spray nozzle used in a dry spray method. The spray nozzle discharges liquid into a flow path through which powder flows, kneads the powder and liquid in the flow path, and discharges the kneaded mixture from the spray port.

JP-A-8-103699

However, the spray nozzle disclosed in Patent Document 1 has a structure in which a plurality of discharge holes (water injection ports) for discharging liquid into the flow path are provided on the peripheral wall of the flow path. In such a structure, the liquid discharged from the discharge holes flows before reaching the center of the flow path, so that the amount of liquid supplied is smaller near the center of the flow path than near the peripheral wall. Further, the flow velocity of the powder flowing in the flow path is faster near the center than near the peripheral wall of the flow path. For this reason, the powder and the liquid are likely to vary in the vicinity of the center of the flow path.
An object of the present invention is to provide a spray nozzle capable of suppressing variations in kneading between powder and liquid.

  In order to achieve the above object, a spray nozzle according to an aspect of the present invention includes a liquid supply unit that supplies a liquid kneaded with powder flowing in the flow path to a flow path partitioned by a peripheral wall. The supply unit has a discharge pipe provided with a plurality of discharge holes for discharging the liquid from the peripheral wall into the flow path.

  According to one embodiment of the present invention, it is possible to provide a spray nozzle capable of suppressing variation in kneading between powder and liquid.

It is a block diagram which shows the dry-type spraying system which comprised the spraying nozzle which concerns on the 1st Embodiment of this invention. In the spray nozzle concerning the 1st Embodiment of this invention, it is typical sectional drawing which shows the cross-section along the direction through which powder flows. FIG. 3 is a schematic cross-sectional view of a main part in which a portion of a liquid supply unit shown in FIG. 2 is enlarged. FIG. 4 is a schematic cross-sectional view showing a cross-sectional structure along a direction orthogonal to a direction in which powder flows in the liquid supply unit shown in FIG. 3. In the spray nozzle concerning the 2nd Embodiment of this invention, it is a principal part typical sectional drawing which shows the cross-sectional structure along the direction through which powder flows. FIG. 6 is a schematic cross-sectional view showing a cross-sectional structure along a direction orthogonal to a direction in which powder flows in the liquid supply unit shown in FIG. 5. FIG. 9 is a schematic cross-sectional view of a main part showing a cross-sectional structure along a direction in which powder flows in a spray nozzle according to a third embodiment of the present invention. 8 is a schematic cross section showing a cross-sectional structure of a branch discharge pipe along a direction orthogonal to a direction in which powder flows in the liquid supply unit shown in FIG. In the spray nozzle which concerns on the 4th Embodiment of this invention, it is typical sectional drawing which shows the cross-section along the direction through which powder flows.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In all the drawings for explaining the embodiments of the invention, those having the same function are given the same reference numerals, and their repeated explanation is omitted.
(First embodiment)
Before describing the spray nozzle 2 according to the first embodiment of the present invention, the dry spray system 1 including the spray nozzle 2 will be described.
As shown in FIG. 1, the dry spray system 1 includes a powder supply path 4 that supplies powder from a powder supply source 3 to a spray nozzle 2 according to the first embodiment of the present invention. The dry spray system 1 also includes a liquid supply path 7 that supplies the liquid from the liquid supply source 6 to the spray nozzle 2. The spray nozzle 2 is configured to knead the powder supplied through the powder supply path 4 and the liquid supplied through the liquid supply path 7 to generate a kneaded product. And the spray nozzle 2 is comprised so that the produced | generated kneaded material 9 may be ejected from the spray port 42. FIG.

The powder supply source 3 is configured to quantitatively supply the powder to the spray nozzle 2. Then, the powder of the powder supply source 3 is supplied to the spray nozzle 2 using the compressed air of the compressed air supply source 5. The powder varies depending on the kneaded product to be produced, but in the first embodiment, for example, a dry powder material that is a base material of concrete, mortar, or fireproof coating material is used.
A high-pressure pump 8 is installed in the middle of the liquid supply path 7. The liquid of the liquid supply source 6 is supplied to the spray nozzle 2 using the pumping force of the high-pressure pump 8. As a liquid, although it changes according to the kneaded material 9 to produce | generate, water is used in this 1st Embodiment, for example.

Next, the structure of the spray nozzle 2 according to the first embodiment will be described with reference to FIGS.
As shown in FIGS. 2 and 3, the spray nozzle 2 according to the first embodiment supplies the liquid 9 </ b> B mixed with the powder 9 </ b> A flowing through the flow path 12 to the flow path 12 partitioned by the peripheral wall 11. The liquid supply part 10 to supply is provided. And the liquid supply part 10 has the surrounding wall 11 and the flow path 12, and the discharge pipe 20 provided with the some discharge hole 21 which leaves | separates the liquid 9B in the flow path 12 away from the surrounding wall 11. . As can be seen from FIG. 4, the flow path 12 has a circular cross section that is perpendicular to the direction in which the powder 9 </ b> A flows.

The spray nozzle 2 according to the first embodiment is disposed on the downstream side of the liquid supply unit 10 and communicates with the flow path 12 of the liquid supply unit 10 as shown in FIGS. A kneading transfer pipe 30 provided with 31 is provided. As shown in FIG. 3, the kneading transfer tube 30 is connected to the downstream side of the liquid supply unit 10 by a connecting metal fitting 46. A powder supply hose 35 serving as a powder supply path 4 is connected to the upstream side of the liquid supply unit 10 by a connection fitting 45. The flow path 12 of the liquid supply unit 10 communicates with the powder supply path 36 of the powder supply hose 35.
Further, as shown in FIG. 2, the spray nozzle 2 according to the first embodiment is disposed on the downstream side of the kneading transfer pipe 30 and is connected to the kneading path 31 of the kneading transfer pipe 30 and the blowing nozzle 41. The nozzle 40 provided with the spigot 42 is provided. The liquid supply unit 10 and the kneading transfer pipe 30 are made of, for example, steel, rubber, or hard plastics. The discharge pipe 20 and the nozzle 40 are made of, for example, steel, aluminum, or hard plastic.

  As shown in FIGS. 3 and 4, the liquid supply unit 10 includes an outer peripheral wall 13 disposed outside the peripheral wall 11, and a liquid supply chamber formed by the peripheral wall 11 and the outer peripheral wall 13 so as to surround the peripheral wall 11 in the circumferential direction. 14. For example, the liquid supply chamber 14 has an annular shape with an endless cross-sectional shape perpendicular to the direction in which the powder 9A flows. The liquid supply unit 10 further includes a liquid supply pipe 15 that is connected to the outer peripheral wall 13 and that is provided with a liquid supply path 16 that communicates with the liquid supply chamber 14 through an outer peripheral wall through hole 13 a that passes through the outer peripheral wall 13. doing. The liquid supply pipe 15 communicates with the liquid supply source 6 through the liquid supply path 7 shown in FIG.

As shown in FIGS. 3 and 4, the discharge pipe 20 extends linearly in the flow path 12 so as to cross the center of the flow path 12 of the liquid supply section 10, and both ends are liquid supply sections. 10 peripheral walls 11 are supported. The discharge pipe 20 further includes a pipe line 22 connected to each of the plurality of discharge holes 21. Both ends of the conduit 22 communicate with the liquid supply chamber 14 through a peripheral wall through hole 11 a that penetrates the peripheral wall 11 of the liquid supply unit 10.
As shown in FIG. 4, the plurality of discharge holes 21 are arranged along the extending direction of the discharge pipe 20. The plurality of ejection holes 21 are provided so as to face the peripheral wall 11 of the liquid supply unit 10. The plurality of discharge holes 21 are provided on both the left and right sides of the discharge pipe 20 in the cross-sectional direction across the flow path 12.

The powder 9A is supplied from the powder supply source 3 shown in FIG. 1 to the spray nozzle 2 shown in FIG. As shown in FIG. 3, the powder 9 </ b> A supplied to the spray nozzle 2 flows through the flow path 12 of the liquid supply unit 10 from the upstream side toward the downstream side.
On the other hand, the liquid 9B is supplied from the liquid supply source 6 shown in FIG. 1 to the spray nozzle 2 shown in FIG. The liquid 9B supplied to the spray nozzle 2 flows (supplied) into the liquid supply chamber 14 through the outer peripheral wall through-hole 13a of the liquid supply unit 10 shown in FIGS. Then, the liquid 9B flows (supplied) from the liquid supply chamber 14 into the conduit 22 of the discharge pipe 20 through the peripheral wall through hole 11a. And the liquid 9B is discharged in the flow path 12 from the several discharge hole 21, as shown in FIG.3 and FIG.4. Then, the liquid 9B is kneaded with the powder 9A, and the kneaded product 9 is generated while the liquid 9B and the powder 9A are flowing in the kneading path 31 of the kneading transfer pipe 30 from the liquid supply unit 10 side toward the nozzle 40 side. Is done. Then, the produced kneaded material 9 is ejected from the spray port 42 of the nozzle 40.

Here, the conventional spray nozzle has a structure in which a plurality of discharge holes for discharging liquid into the flow path are provided in the peripheral wall of the flow path. In such a structure, the liquid discharged from the discharge hole flows before reaching the center of the flow path, and the amount of liquid supplied near the center of the flow path is smaller than that near the peripheral wall. In the vicinity, the kneading between the powder and the liquid tends to vary.
In contrast, in the spray nozzle 2 according to the embodiment of the present invention, the liquid supply unit 10 is provided with a plurality of discharge holes 21 for discharging the liquid 9B away from the peripheral wall 11 into the flow path 12. It has a tube 20. Therefore, according to the spray nozzle 2 according to the embodiment of the present invention, the liquid 9B can be forcibly supplied also to the vicinity of the center of the flow path 12, so that the dispersion of the powder 9A and the liquid 9B is kneaded. Can be suppressed. Moreover, since the dispersion | variation in kneading | mixing with powder 9A and the liquid 9B can be suppressed, the quality improvement of the produced | generated kneaded material 9 can be aimed at more. Further, since the quality of the kneaded product 9 can be further improved, dusting and rebounding of the kneaded product 9 can be reduced, and further, improvement of the working environment and cost reduction by lowering the adhesion rate of the kneaded product 9 can be achieved. Can do.

Further, in the spray nozzle 2 according to the first embodiment of the present invention, the discharge pipe 20 extends linearly so as to cross the center of the flow path 12 of the liquid supply unit 10, and both ends are supplied with liquid. It is supported by the peripheral wall 11 of the part 10. Therefore, according to the spray nozzle 2 according to the first embodiment of the present invention, the discharge pipe 20 can be stably disposed even in the flow path 12 through which the powder 9A flows.
In the spray nozzle 2 according to the first embodiment of the present invention, the plurality of discharge holes 21 are arranged along the extending direction of the discharge pipe 20. The plurality of ejection holes 21 are provided so as to face the peripheral wall 11 of the liquid supply unit 10. The plurality of discharge holes 21 are provided on both the left and right sides of the discharge pipe 20 in the cross-sectional direction across the flow path 12. Therefore, according to the spray nozzle 2 according to the first embodiment of the present invention, since the liquid 9B can be supplied uniformly from the vicinity of the peripheral wall of the flow path 12 to the vicinity of the center, the powder 9A and the liquid 9B The variation in kneading can be further suppressed.

(Second Embodiment)
The spray nozzle 2A according to the second embodiment of the present invention has substantially the same configuration as the spray nozzle 2 according to the first embodiment described above, but the configuration of the liquid supply unit 10A is different. .
As shown in FIGS. 5 and 6, the spray nozzle 2 </ b> A according to the second embodiment of the present invention is a liquid kneaded with the powder 9 </ b> A flowing through the flow path 12 in the flow path 12 defined by the peripheral wall 11. A liquid supply unit 10A for supplying 9B is provided. And the liquid supply part 10A has the surrounding wall 11, the flow path 12, the discharge pipe 20, the outer peripheral wall 13, the liquid supply chamber 14, and the liquid supply pipe | tube 15 similarly to 1st Embodiment. Further, unlike the liquid supply unit 10 described above, the liquid supply unit 10A further includes a plurality of peripheral wall discharge holes 11b that are provided in the peripheral wall 11 along the circumferential direction and discharge the liquid 9B into the flow path 12. doing. Each of the plurality of peripheral wall discharge holes 11 b communicates with the liquid supply chamber 14.
As described above, the spray nozzle 2A according to the second embodiment has the discharge pipe 20, and the peripheral wall 11 is provided with the plurality of peripheral wall discharge holes 11B. As a result, the liquid 9B can be supplied evenly, and the dispersion of the kneading between the powder 9A and the liquid 9B can be further suppressed as compared with the spray nozzle 2 according to the first embodiment.

(Third embodiment)
The spray nozzle 2B according to the third embodiment of the present invention has substantially the same configuration as the spray nozzle 2 according to the first embodiment described above, but the configuration of the liquid supply unit 10B is different. .
As shown in FIGS. 7 and 8, the spray nozzle 2 </ b> B according to the third embodiment of the present invention is kneaded with the powder 9 </ b> A flowing through the flow path 12 in the flow path 12 defined by the peripheral wall 11. A liquid supply unit 10B that supplies the liquid 9B is provided. And the liquid supply part 10B has the surrounding wall 11, the flow path 12, the discharge pipe 20, the outer peripheral wall 13, the liquid supply chamber 14, and the liquid supply pipe | tube 15 similarly to 1st Embodiment. Further, the liquid supply unit 10B has a plurality of branch discharge holes 24 that branch out from the middle of the discharge pipe 20 and project to the downstream side of the flow path 12 and discharge the liquid 9B away from the peripheral wall 11 into the flow path 12. A branch discharge pipe 23 is further provided. The plurality of branch discharge holes 24 communicate with the pipe line 22 of the discharge pipe 20 through a pipe line 25 provided in the branch discharge pipe 23. The plurality of branch discharge holes 24 include a branch discharge hole 24a that faces the peripheral wall 11 and a branch discharge hole 24b that discharges the liquid 9B toward the downstream side.

As described above, the spray nozzle 2B according to the third embodiment has the discharge pipe 20, and is further provided with a plurality of branch discharge holes 24 that discharge the liquid 9B away from the peripheral wall 11 into the flow path 12. Since the branch discharge pipe 23 is provided, more liquid 9B can be supplied to the vicinity of the center of the flow path 12, and the powder 9A and liquid can be supplied as compared with the spray nozzle 2 according to the first embodiment. Variation in kneading with 9B can be further suppressed.
Note that the third embodiment and the second embodiment may be combined. That is, the liquid supply unit may be configured to include the discharge pipe 20, the plurality of peripheral wall discharge holes 11 b, and the branch discharge pipe 23.

(Fourth embodiment)
In the above-described first to third embodiments, the case where one liquid supply unit is provided has been described. On the other hand, the spray nozzle 4C according to the fourth embodiment of the present invention includes two liquid supply portions 10 arranged along the direction in which the powder 9A flows, as shown in FIG. By providing the two liquid supply units 10 as described above, it is possible to further suppress variation in kneading between the powder 9A and the liquid 9B as compared with the first embodiment.
Note that three or more liquid supply units 10 may be provided. Moreover, although the liquid supply part 10 was demonstrated in 4th Embodiment, two or more liquid supply parts 10A may be provided, and two or more liquid supply parts 10B may be provided. Further, at least any two liquid supply units of the liquid supply unit 10, the liquid supply unit 10A, and the liquid supply unit 10B may be combined and mixed. Further, in the two liquid supply units, the angle of each discharge pipe 20 may be relatively shifted with the center of the flow path 12 as an axis.

  The present invention has been specifically described above based on the above embodiment, but the present invention is not limited to the above embodiment, and it is needless to say that various changes can be made without departing from the scope of the invention.

  For example,

DESCRIPTION OF SYMBOLS 1 ... Dry spray system 2 ... Spray nozzle 3 ... Powder supply source 4 ... Powder supply path 5 ... Compressed air supply source 6 ... Liquid supply source 7 ... Liquid supply path 8 ... High pressure pump 9 ... Kneaded material 10 ... Liquid Supply part 11 ... peripheral wall 11a ... peripheral wall through hole 11b ... peripheral wall discharge hole 12 ... flow path 13 ... outer peripheral wall 13a ... outer peripheral wall through hole 14 ... liquid supply chamber 20 ... discharge pipe 21 ... discharge hole 22 ... pipe line 23 ... branch discharge Pipe 24 ... Branch discharge hole 25 ... Pipe line 30 ... Kneading transfer pipe 31 ... Kneading path 35 ... Powder supply hose 36 ... Powder supply path 40 ... Nozzle 41 ... Nozzle path 42 ... Blowing port 45, 46 ... Connecting metal fittings

Claims (9)

A liquid supply unit that supplies liquid to be kneaded with the powder flowing through the flow path to the flow path partitioned by the peripheral wall,
The spray nozzle according to claim 1, wherein the liquid supply section includes a discharge pipe provided with a plurality of discharge holes for discharging the liquid from the peripheral wall into the flow path.   The spray nozzle according to claim 1, wherein both ends of the discharge pipe are supported by the peripheral wall so as to cross the flow path.   The spray nozzle according to claim 2, wherein the plurality of discharge holes are arranged along an extending direction of the discharge pipe.   The spray nozzle according to claim 3, wherein the plurality of discharge holes are provided so as to face the peripheral wall.   The spray nozzle according to claim 4, wherein the plurality of discharge holes are provided on both right and left sides of the discharge pipe in a cross-sectional direction across the flow path.   The liquid supply unit is provided with a plurality of branch discharge holes that branch out from the middle of the discharge pipe and project downstream from the flow path, and discharge the liquid into the flow path away from the peripheral wall. The spray nozzle according to any one of claims 1 to 5, further comprising a branch pipe.   The said liquid supply part is provided in the said surrounding wall along the circumferential direction, and has the some surrounding wall discharge hole which discharges the said liquid in the said flow path, The blowing of Claim 6 characterized by the above-mentioned. Attached nozzle. The liquid supply unit further includes an outer peripheral wall disposed outside the peripheral wall, and a liquid supply chamber formed by the peripheral wall and the outer peripheral wall so as to surround the peripheral wall in the circumferential direction,
The discharge pipe has a pipeline connected to each of the plurality of discharge holes,
The spray nozzle according to any one of claims 1 to 7, wherein the pipe line is connected to the liquid supply chamber through a peripheral wall through-hole penetrating the peripheral wall. A kneading transfer pipe connected to the downstream side of the liquid supply unit and provided with a kneading path communicating with the flow path;
A nozzle connected to the downstream side of the kneading transfer pipe and provided with a nozzle path and a spray port communicating with the kneading path;
The spray nozzle according to claim 8, further comprising:

Images