JPH0417231Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention relates to a powder mixing machine used in pneumatic conveyors, etc., and is characterized in that its structure has been particularly improved.

(Prior Art) Conventionally, there has been an injection feeder as shown in FIG. 2, which is a type of powder mixing machine.

That is, 1 is the fluid injection tube tip 1 which gradually shrank, 2 is the transport tube starting end which gradually expanded, and 3 is the supply gutter for the powder m, where the powder m is transported with the fluid injection tube tip 1. It is sucked into the transport pipe starting end 2 through the mutual gap 4 with the pipe starting end 2 .

(Problems to be solved by the invention) In the above-mentioned conventional device, due to its structure, the supply gutter 3 is
Since the granular material m remains at the inner bottom of the granular material m, when transporting the next dissimilar granular material m, there is an inconvenience that the remaining granular material m from the previous one mixes into the granular material m being transported. .

Therefore, an object of the present invention is to provide a powder mixing machine that can efficiently suck the powder m without leaving it behind.

(Means for Solving the Problems) That is, as shown in FIG. 1, the present invention connects the gradually contracted fluid injection pipe tip 1a and the gradually enlarged transport pipe starting end 2a to the abutment strip, It is also characterized in that an opening 4 is provided through a part of the upper wall of the transport pipe starting end 2a, and a supply path 3a for the granular material m is communicated with the opening 4.

(Example) Hereinafter, specific examples of the present invention will be described with reference to the drawings.

FIG. 1 shows a powder mixer installed on a pneumatic conveyor, where 1a is the tip of a gradually reduced fluid injection tube to which high-pressure air discharged from a blower (not shown) is supplied in the direction of arrow a. Reference numeral 2a denotes a gradually enlarged transport pipe starting end, and an opening 4 is provided in the upper part of the peripheral wall thereof in a penetrating manner, and this transport pipe starting end 2a and the fluid injection pipe tip 1a communicate with each other in an abutting manner. ing. Reference numeral 3a denotes a supply path for the powder m, the tip of which communicates with the opening 4 in an abutting manner.

Now, in the supply path 3a, move the powder m to the arrow b.
When the powder or granular material m is fed in the direction of
The gas is sucked into the starting end 2a of the transport pipe, and then transported to the downstream side while recovering the pressure within the starting end 2a of the transport pipe. In this case, since there is a high-speed air flow everywhere inside the transport pipe starting end 2a, the powder m supplied into the transport pipe starting end 2a does not stay inside the transport pipe starting end 2a, and all of the powder is left behind. It is moved to the stream side. In addition, the high-speed air flow injected from the fluid injection tube tip 1a is in a steady state if the conditions are the same, and for example, its outermost streamline n is diffused by a line segment length c when it is near the opening 4. However, since the diffusion of the streamline n1 is restricted by the peripheral wall of the transport pipe starting end 2a except near the opening 4, the passage cross-sectional area of the transport pipe starting end 2a is As shown in Figure 2, it is in a state where it is reduced in size compared to the conventional device. This means that the starting end of the transport pipe 2
This means that the speed of the high-speed airflow at point a is higher than in the case of the conventional device, and at the same time it also means that the pressure at the beginning end 2a of the transport pipe is lower than in the case of the conventional device. In this way, the granular material m can be supplied into the transport pipe starting end 2a more efficiently than before.

In the apparatus of the above embodiment, it is possible to freely feed the powder m together with the supply fluid into the supply path 3a.

In addition, the fluid injection pipe tip 1a and the transport pipe starting end 2
A short conduit with a constant cross section may be interposed at the point of communication with a.

(Effect of the invention) As described above, according to the invention, since the powder m does not remain inside the supply path 3a, the powder m supplied into the transport pipe starting end 2a is This eliminates the inconvenience caused by the mixing of the powder m remaining during the transportation of the fluid, and the streamline n1 of the fluid injected from the fluid injection pipe tip 1a does not reach the starting end of the transport pipe except for the vicinity of the opening 4. Since its diffusion is restricted by the peripheral wall of the transport pipe 2a, the powder m is efficiently sucked into the transport pipe starting end 2a.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing one embodiment of the device of the present invention, and FIG. 2 is a diagram showing a conventional device. Symbols, 1a...Fluid injection pipe tip, 2a...Transport pipe starting end, 3a...Supply channel, 4...Opening, m...
...Powder material.

Claims (1)

[Scope of utility model registration request] The gradually contracted fluid injection pipe tip 1a and the gradually enlarged transport pipe starting end 2a are made to communicate with each other in an abutting manner, and an opening 4 is bored in a part of the upper wall of the transport pipe starting end 2a. 4 and a supply path 3a for powder or granular material m are communicated with each other.