JPH0622713B2 - Discharge nozzle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a discharge nozzle suitable for gas flow discharge of powder, and particularly to a discharge nozzle capable of easily controlling the supply of powder.

[Conventional technology]

Conventionally, as an example of a discharge nozzle which is used for gas flow discharge of powder and can supply powder intermittently, a nozzle shown in a sectional view in FIG. 3 is known.

The discharge nozzle has a nozzle block 21 in which a flow path 20 extending in the flow direction of powder (downward in the drawing) is formed, and a powder flow pipe 22 communicating with the flow path 20 is connected to the nozzle block 21. As shown in the drawing, an air pipe 23 and a suction pipe 24, which are orthogonal to the flow path 20 and are arranged in opposite directions, are connected to the nozzle block.

In the discharge nozzle, the flow of the powder agent, which is normally supplied from the powder flow supply pipe 22 and is discharged downward in the drawing, is supplied with air by the air pipe 23 and suction by the suction pipe 24. The supply to the bottom of can be stopped. Therefore, by repeating the air supply and the suction, it is possible to perform control such as intermittently supplying the powder in the downward direction.

[Problems to be Solved by the Invention]

However, the conventional discharge nozzle has a structure in which the air pipe 23 and the suction pipe 24 are connected to the nozzle block 21 having the flow path 20 in the above-described shape, and thus it is difficult to reduce the size and weight of the shape. However, there is a problem that it cannot be effectively used because it is severely restricted in practical use such as being incorporated in a device.

Therefore, an object of the present invention is to provide a discharge nozzle which can be made compact and lightweight because of its simple structure and which can surely control the supply of powder.

[Means for Solving the Problems]

The present invention has a tip nozzle connected to a suction pipe, and an inner nozzle arranged in the tip nozzle, and the inner nozzle is connected to a powder flow supply pipe arranged in the suction pipe. The above object is achieved by providing a discharge nozzle in which the tip of the inner nozzle is located inside the tip of the tip nozzle.

[Action]

According to the discharge nozzle of the present invention, when the inside of the suction pipe is in a low-pressure suction state, and the powder is supplied together with the gas into the powder flow supply pipe under such a state, only the surplus gas flowing out from the tip of the inner nozzle is supplied to the suction pipe. Since it is sucked, the powder is discharged and supplied from the tip nozzle, and when the suction pipe is switched to a high pressure suction state, both the surplus gas flowing out from the tip of the inner nozzle and the powder are sucked into the suction pipe. Therefore, the discharge supply of the powder is stopped.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 and FIG. 2 are partial cross-sectional views showing the discharge nozzle of one embodiment according to the present invention as well as acting.

The discharge nozzle of this embodiment has a tip nozzle 1 and an inner nozzle 2 arranged inside thereof.

A narrow discharge hole 1a is formed at the center of the tip of the tip nozzle, and the rear end is inserted into the tip of the suction pipe 3 to connect them.

The inner nozzle 2 has a flow path 2a at the center thereof, and its tip is located inside the tip of the tip nozzle 1, and the inner nozzle 2 is provided with a powder flow supply pipe 4 from the rear end side. The tip part is inserted and fitted together. Further, the outer peripheral surface of the inner nozzle 2 is in contact with the inner peripheral surface of the tip nozzle 1, and the inner nozzle 2 further has a plurality of ventilation holes 2b (upper and lower in the figure) at a position surrounding the flow path 2a. In the direction). Therefore, by making the inside of the suction pipe 3 in a suction state, the space located between the back surface of the tip of the tip nozzle 1 and the tip of the inner nozzle 2 can be sucked through the vent hole 2b. The suction pipe 3 is connected to a collector (not shown) including a fan via a low pressure suction path (not shown) and a high pressure suction path (not shown). Also,
An ejector (not shown) is provided in the middle of the high-pressure suction path.
Is provided.

Next, the operation of this embodiment will be described.

FIG. 1 shows the discharge nozzle of this embodiment in the discharge state. That is, the suction pipe 3 is communicated with a low pressure suction path (not shown), and a low pressure suction state in the direction of the arrow indicated by the thin arrow is formed in the supply pipe 3. While maintaining the low-pressure suction state, a powdered substance in a fluidized state formed by mixing the powdered substance and air under a predetermined condition is formed in the powdered substance flow supply pipe 4 through an ejector (not shown). Supply downward as indicated by the middle arrow.

The low pressure suction state formed in the suction pipe 3 is
It is adjusted so that only the excess air flowing out from the tip of the flow path 2a of the inner nozzle 2 can be appropriately discharged. As a result, the powder A can be discharged from the discharge hole 1a located at the tip of the tip nozzle 1. Therefore, by continuing the state shown in FIG. 1, the powder A can be continuously discharged.

FIG. 2 shows the discharge nozzle of this embodiment in the discharge stopped state. That is, the powdered material flow supply pipe 4 continues to supply the powdered material flow material under the same conditions as in the case of the discharge state, but the suction pipe 3 is switched to a high pressure suction path (not shown), and By supplying air to the ejector in the middle part of the above, a high-pressure suction state in the direction of the arrow indicated by the thick arrow is formed in the suction pipe 3.

The high-pressure suction state is the flow path 2a of the inner nozzle 2.
It is adjusted to the extent that both the powder and the air flowing out from the tip of the nozzle are sucked in, and the air is introduced from the outside through the discharge hole 1a. As a result, all the powder A supplied as the powder liquid is sucked in the suction pipe 3 in the direction of the arrow (upward in the figure), so that the discharge supply of the powder A from the discharge port 1a can be stopped. it can.

Therefore, the discharge nozzle of the present embodiment can intermittently discharge the powder A by alternately repeating the low suction state of FIG. 1 and the high pressure suction state of FIG.

Although the structure of the discharge nozzle of this embodiment described in detail above is extremely simple, it is possible to reliably control the discharge of the powder agent and its stop.

In addition, since the discharge nozzle has a simple structure, the discharge nozzle itself can be made smaller and lighter, and as a result, it can be easily incorporated into a small device and its utility value is greatly improved. To do.

The present invention has been specifically described above based on the embodiments. However, the discharge nozzle of the present invention is not limited to that shown in the above embodiments, and its specific shape is variously modified without departing from the scope of the invention. Needless to say, it is possible, and the forming material is not particularly limited, and any material can be used.

It is also possible to improve the focusing effect in the discharge direction of the powder by attaching a discharge electrode to the tip of the discharge nozzle and providing a position earth electrode facing the discharge nozzle.

Further, as a powder agent to which the discharge nozzle of the present invention can be applied,
Although not particularly limited, powder detergent, powder water absorbing agent, powder adhesive, powder coating and the like can be preferably exemplified.

Further, in the examples, the case where air is used as the gas for forming the flow state of the powder has been shown, but various changes can be made as necessary, and for example, a chemically inert gas such as nitrogen should be used. You can also

〔The invention's effect〕

Since the discharge nozzle of the present invention has a simple structure, it can be easily reduced in size and weight, and moreover, the supply of the powder agent can be surely controlled.

[Brief description of drawings]

1 and 2 are partial cross-sectional views showing the operation of the discharge nozzle of one embodiment according to the present invention, and FIG. 3 is a cross-sectional view showing an example of a conventional discharge nozzle. A: Dust agent 1; Tip nozzle 2; Inner nozzle 3; Suction pipe 4; Dust agent flow supply pipe

Claims (1)

[Claims] 1. A tip nozzle connected to a suction pipe, and an inner nozzle provided in the tip nozzle, wherein the inner nozzle is provided in a powder flow supplying pipe provided in the suction pipe. A discharge nozzle connected to the inner nozzle, wherein the tip of the inner nozzle is located inside the tip of the tip nozzle.