JPH10141299A - Ejector for ejecting powder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably scatter powder as well as to easily reduce the ejection amount of powder, concerning an ejector for injecting powder, for injecting powder by the driving flow of driving gas such as air. SOLUTION: An ejector for ejecting powder is provided with an ejector main body 10 in which a powder suction port 27 for sucking powder is formed on one side and a powder injection port 19 for ejecting powder is formed on the other side. The ejector main body 10 is provided with a driving gas inflow port 15 to which driving gas is to be allowed to flow, a nozzle part 21 formed between the powder suction port 27 of a powder ejection pipeline and the powder ejection port 19, and to which driving gas is supplied from the driving gas inflow port 15, and for ejecting driving gas toward the powder ejection port 19 side, and a noble gas inflow port 33 formed between the powder suction port 27 of the powder ejection pipeline and the nozzle part 21 and to which noble gas for diluting density of powder to be sucked from the powder suction port 27 is to be allowed to flow.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder ejecting ejector for ejecting powder by a driving flow of a driving gas such as air.

[0002]

2. Description of the Related Art Generally, in a brazing operation of a radiator, an oil cooler, or the like of an automobile, a powder flux is applied before heat treatment is performed in a brazing furnace.
Conventionally, in such a powder flux application operation, an ejector for ejecting powder has been widely used in order to eject powder powder by air pressure.

FIG. 3 shows such an ejector for ejecting powder. The ejector for ejecting powder has a powder mixing member 1. Inside the powder mixing member 1, an air inflow chamber 1a is formed.

On the outer peripheral surface of the powder mixing member 1, there is formed a driving gas inlet 1b communicating with the air inflow chamber 1a.
On the left end surface of the powder mixing member 1 in the figure, an annular powder ejection portion 1c is formed to protrude in the axial direction. The powder ejection part 1c has a powder ejection port 1 communicating with the air inflow chamber 1a.
d is formed.

[0005] A tapered nozzle portion 1e that extends inward is formed on the side of the air inflow chamber 1a of the powder ejection port 1d. An introduction member insertion hole 1f communicating with the air inflow chamber 1a is formed on the end face of the powder mixing member 1 opposite to the powder ejection port 1d. A cylindrical powder introduction member 3 is inserted into the introduction member insertion hole 1f.

The powder introduction member 3 includes a powder mixing member 1
A powder suction port 3a communicating with the air inflow chamber 1a is formed. The tip of the powder introduction member 3 on the side of the nozzle 1e is formed in a tapered shape corresponding to the shape of the nozzle 1e of the powder mixing member 1, and is located near the nozzle 1e.

Further, as shown in FIG.
An air compressor 5 is connected to the driving gas inlet 1b via an air pipe 4. Further, a powder storage tank 7 is connected to the powder suction port 3a of the powder introduction member 3 via a powder supply pipe 6, and the powder storage tank 7 stores a powder flux. I have.

Then, the powder ejection port 1d of the powder mixing member 1
The capacitor 8 to which the powder flux is to be applied is disposed in a temporarily assembled state below the figure. In the above-described powder ejector, when compressed air is supplied from the air compressor 5 to the driving gas inlet 1b of the powder mixing member 1, the compressed air flows into the air inflow chamber 1a, and the flow rate of the compressed air is reduced. After being squeezed by the nozzle portion 1e and the pressure is increased, the powder is ejected from the powder ejection port 1d of the powder ejection portion 1c.

At the same time, the driving flow of compressed air flowing from the driving gas inlet 1b to the powder outlet 1d through the nozzle portion 1e flows from the powder inlet 3a toward the powder outlet 1d. The next flow is generated, and a negative vacuum pressure is generated in the powder suction port 3a of the powder introduction member 3 (Venturi effect).
Then, the powder flux sucked from the powder suction port 3a by the negative pressure is caused to flow toward the powder ejection port 1d side by the secondary flow, and the driving flow and the secondary flow join at the nozzle portion 1e, and the compressed air is compressed. And the powder flux are mixed, and the powder flux is ejected from the powder ejection port 1d together with the compressed air.
The powder flux can be uniformly applied to the capacitor 8.

[0010]

However, in the powder ejector described above, the powder flux is sucked by the negative pressure acting on the powder suction port 3a, and is ejected from the powder ejection port 1d together with the compressed air. Therefore, there is a problem that it is difficult to adjust the amount of powder flux to be ejected.

Further, in order to reduce the amount of powder flux to be ejected, the pressure of the compressed air supplied to the driving gas inlet 1b is reduced to reduce the suction force due to the negative pressure acting on the powder suction port 3a. However, there is a problem that the flow velocity of the driving flow of the compressed air, which is a power source for ejecting the powder flux, is reduced, and the powder flux is not sufficiently scattered. The present invention has been made to solve such a conventional problem, and an ejector for ejecting powder capable of easily adjusting the amount of ejected powder and capable of reliably scattering the powder. The purpose is to provide.

[0012]

According to a first aspect of the present invention, there is provided an ejector for ejecting powder, wherein a powder suction port for sucking powder is formed on one side, and the powder suction port is sucked from the powder suction port on another side. An ejector main body having a powder ejection conduit in which a powder ejection outlet for ejecting powder is formed, the ejector main body includes a driving gas inlet through which a driving gas flows, and the ejector main passage having the powder ejection passage. The driving gas is formed between the powder inlet and the powder outlet, and the driving gas is supplied from the driving gas inlet.
A nozzle portion for ejecting the driving gas toward the powder ejection port side is formed between the powder suction port and the nozzle portion of the powder ejection pipe line, and is sucked from the powder suction port. A dilution gas inlet through which a dilution gas for diluting the density of the powder is introduced.

(Function) In the powder ejecting ejector according to the first aspect, when the driving gas flowing from the driving gas inflow port is ejected from the nozzle portion toward the powder ejection port, the driving flow of the driving gas causes A secondary flow is generated from the powder inlet toward the powder outlet, and a negative pressure is generated at the powder inlet.

The powder sucked from the powder suction port by the negative pressure is diluted in density by the diluent gas flowing from the diluent gas inlet, and then flows toward the powder outlet by the secondary flow. Then, the driving flow and the secondary flow merge at the nozzle portion, the driving gas and the powder are mixed, and the powder is ejected from the powder ejection port together with the driving gas.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of an ejector for ejecting powder of the present invention. In the figure, reference numeral 10 denotes an ejector body. The ejector body 10 has a powder mixing member 11 and a powder introduction member 25 described later. In this embodiment, the powder mixing member 11 is made of a metal material, and is formed in an annular shape by turning using an NC lathe.

In the vicinity of the center inside the powder mixing member 11,
The diameter of the air inflow chamber 13 is increased by boring. In the vicinity of the center of the outer peripheral surface of the powder mixing member 11, a driving gas inflow port 15 communicating with the air inflow chamber 13 is formed. On the left end surface of the powder mixing member 11 in the figure, an annular powder ejection portion 17 protruding in the axial direction is integrally formed.

On the inner peripheral surface of the powder ejection section 17, a powder ejection port 19 communicating with the air inflow chamber 13 is formed.
The air inflow chamber 1 is located on the air inflow chamber 13 side of the powder ejection port 19.
A nozzle portion 21 having a tapered shape extending toward the inside of the nozzle 3 is formed. An introduction member insertion hole 23 communicating with the air inflow chamber 13 is formed on an end surface of the powder mixing member 11 opposite to the powder ejection port 19.

A cylindrical powder introduction member 25 whose outer dimensions correspond to the inner diameter of the introduction member insertion hole 23 is fitted into the introduction member insertion hole 23. Powder introduction member 25
Are fixed to the powder mixing member 11 by bolts (not shown) screwed from the outer peripheral direction of the powder mixing member 11 toward the center. A powder suction port 27 communicating with the air inflow chamber 13 of the powder mixing member 11 is provided on an inner peripheral surface of the powder introduction member 25.
Are formed.

A driving gas guide portion 29 having a tapered shape corresponding to the shape of the nozzle portion 21 of the powder mixing member 11 is formed at the tip of the powder introduction member 25 on the side of the air inflow chamber 13. The driving gas guide section 29 and the nozzle section 21 are arranged to face each other with a predetermined gap. On the outer peripheral surface of the powder introduction member 25 on the side opposite to the drive gas guide portion 29, an annular powder suction portion 31 protruding in the circumferential direction is integrally formed.

On the outer peripheral surface of the powder suction unit 31, a dilution gas inlet 33 communicating with the inner peripheral surface of the powder suction unit 31 is formed. In this embodiment, as shown in FIG. 2, a powder storage tank 37 is connected to the powder inlet 27 of the powder introduction member 25 via a powder supply pipe 35.
A powder flux is stored in the powder storage tank 37, and atmospheric pressure acts on the powder flux.

Further, an air compressor 41 is connected to the driving gas inlet 15 of the powder mixing member 11 via a driving gas supply pipe 39. An air compressor 41 is connected to the dilution gas inlet 33 of the powder introduction member 25 via dilution gas supply pipes 45A and 45B provided with a variable flow valve 43.

In this embodiment, the air compressor 41
The pressure of the air flowing into the dilution gas inlet 33 through the variable pressure valve 43 is reduced by the
The pressure is set lower than the pressure of the compressed air flowing into the air.
A capacitor 47 made of an aluminum material to which a powder flux is to be applied is disposed in a temporarily assembled state below the powder outlet 19 of the powder mixing member 11 in the figure.

In the above-described ejector for ejecting powder, when the compressed air flowing from the driving gas inlet 15 is ejected from the nozzle portion 21 toward the powder outlet 19, the driving flow of the compressed air causes the powder to be sucked. A secondary flow is generated from the port 27 toward the powder ejection port 19, and a negative pressure lower than the atmospheric pressure is generated at the powder suction port 27. Then, the powder flux sucked from the powder suction port 27 by the negative pressure is diluted by the air flowing from the dilution gas inlet 33, and then flows toward the powder outlet 19 by the secondary flow. The driving flow and the secondary flow merge at the nozzle section 21, the compressed air and the powder flux are mixed, and the powder flux is ejected from the powder outlet 19 together with the compressed air.

In the powder ejector thus constructed, a powder suction portion 31 is formed on the outer peripheral surface of the powder introduction member 25 on the side opposite to the driving gas guide portion 29, and the powder suction portion 31 is formed. The diluent gas inlet 33 communicating with the inner peripheral surface of the powder suction part 31 is formed on the outer peripheral surface of the powder so as to dilute the density of the powder flux sucked from the powder suction part. The amount of spout can be easily adjusted, and
This powder can be scattered reliably.

In the above ejector for ejecting powder,
Since the variable flow valve 43 is interposed between the dilution gas inlet 33 of the powder introduction member 25 and the air compressor 41 to adjust the pressure of the air supplied to the dilution gas inlet 33, the powder is By performing simple additional processing on the body introduction member 25, the amount of powder flux ejected from the already installed ejector for powder ejection can be easily changed.

In the ejector for ejecting powder of the above-described embodiment, an example of ejecting powder composed of powder flux has been described. However, the present invention is not limited to such an embodiment, and the present invention is not limited to this embodiment. Can be widely applied to powder to be ejected. Further, in the powder ejector according to the above-described embodiment, an example was described in which air was supplied to the driving gas inlet 15 and the dilution gas inlet 33, but the present invention is not limited to such an embodiment. For example, an inert gas such as a nitrogen gas can be supplied according to the powder to be ejected.

[0028]

As described above, in the powder ejector according to the first aspect, the powder suction port for sucking the powder is formed on one side and the powder sucked from the powder suction port is formed on the other side. An ejector body having a powder ejection pipe line in which a powder ejection port for ejecting a body is formed, forming a dilution gas inflow port between the powder suction port and the nozzle portion of the powder ejection pipe line, Since the density of the powder is diluted by the diluent gas flowing into the diluent gas inlet, it is possible to easily reduce the ejection amount of the powder and to scatter the powder reliably. it can.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an ejector for ejecting powder of the present invention.

FIG. 2 is a piping system diagram showing a usage state of the ejector for ejecting powder of FIG. 1;

FIG. 3 is a cross-sectional view showing a conventional powder ejector ejector.

FIG. 4 is a piping diagram showing a use state of the ejector for ejecting powder of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ejector main body 15 Drive gas inflow port 19 Powder ejection port 21 Nozzle part 27 Powder suction port 33 Dilution gas inflow port

Claims (1)

[Claims] A powder suction port (2) for sucking powder into one side.
7) is formed, and an ejector body (10) having a powder ejection pipe line in which a powder ejection port (19) for ejecting the powder sucked from the powder suction port (27) is formed on the other side. The ejector body (10) includes a driving gas inlet (15) through which a driving gas flows, the powder suction port (27) of the powder ejection pipe, and the powder ejection port (19). And a nozzle portion (21) formed between the first and second nozzles and supplied with the driving gas from the driving gas inlet (15), and jetting the driving gas toward the powder jet port (19). The powder injection port (2) is formed between the powder suction port (27) and the nozzle portion (21) of the powder ejection pipe line.
7) a diluent gas inlet (33) through which a diluent gas for diluting the density of the powder sucked in from the above (7) is provided.