JPS62176514A - Powder collector - Google Patents

Abstract

PURPOSE:To remove powders in air current with a minimized pressure loss and without clogging by laminating plates with spacers providing micro spaces between each plate and connecting the micro spaces with a passage. CONSTITUTION:A main body 4 is formed by laminating plates 1, 1 to the direc tion of thickness with spacers providing micro spaces between each plates. A passage 5 for powders passing through by air current, with which said micro spaces are connected, is provided in the main body 4. Powders 7 floating in air current passes through said passage 5 as show by an arrow mark A and sent to micro spaces of the main body 4. At that time, a streamlined flow is formed in air current by micro spaces formed with each of plates 1, by which floating powders are agglomerated and dropped over the plates 1. Super micro powders carrying large displacement amount given by Brownian movement are adhered to the plates 1. Powders thus collected rotate on the plates 1 by 90 degrees, knocked off by a hammering device or the like and collected into a hopper 8.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a powder collector used in the ceramic industry, metal powder industry, and other industries that handle powder.

BACKGROUND OF THE INVENTION Conventionally, the dry process used to produce this type of powder IJill is generally known, and is not shown in the drawings, but the powder is generally suspended in a gas such as air and then allowed to flow.

Only the powder is extracted from the airflow and collected.

A filter that has a temperature of +1 and is capable of capturing only a single amount of heat is normally collected using a bag.

Problems to be Solved by the Invention However, the conventional method described above has the disadvantage that the filter or bag used therein tends to become clogged, and in this case, the flow rate of the airflow is an apparent flow rate of 1 (ml/-8). The processing flow rate is also low, and therefore these devices require a large area and large volume, and have the drawbacks of large pressure loss and large power requirements.

This invention was developed to solve these problems, and its purpose is to eliminate the clogging that occurs in the conventional devices, to achieve a relatively high processing flow rate, and to minimize pressure loss. It is an object of the present invention to provide a powder collector having a relatively simple structure.

Means for Solving the Problems This invention will be described with reference to the drawings showing the embodiments.
In Figures 4 to 4, plate 1 and plate 1 are shown in the thickness direction,
Then, they are overlapped with a small gap 3 provided by a spacer 2 to form a main body 4.

The main body 4 is placed in the passage 5 of the powder by the air flow, and the minute gap 1 is
11i3 is provided in communication with the passage 5. Note that the spacer 2 is omitted in Figures 1 to 3 because the illustrations are sloppy.

In FIG. 1, the powder 7 floating in the airflow passes through the passage 5 as indicated by arrow A7 and reaches the minute gap Va between the main body 4.
3. In this case, the airflow forms a laminar flow due to the minute gaps 3 formed between the plates 1, and therefore the floating powder tends to aggregate, and falls onto the plate 1 as agglomerates.

In addition, especially in the case of thin ultrafine powder, the amount of displacement due to Brownian motion (
The mean free path) is very large, and the amount of displacement reaches the microgap 3, which means that the displacement of 1m on the surface of the plate 1 passes through the microgap 3 in a residence time of several seconds. It adheres to the surface of the body. Or the probability of adhesion is extremely high.

In this way, the particles are collected on the surface of the plate 1 due to the two functions described above, namely, sedimentation due to agglomeration of the powder and adhesion to the surface of the plate 1 due to Brownian motion. The airflow that is lost due to powder flows directly through the small gap 3 and flows out of the main body 4. The powder 7 collected on the surface of the plate 1 is collected by an appropriate method.

Example In figures 1 to 3, number 8 is the hopper.

9 is a casing, 10 is a rotating casing, 11 is an inlet,
12 indicates the exit. 13 is the door of the rotating casing lO, 14 is the hinge, 15 is the fixed part, and 16 is the center of rotation.
Note that illustration of a drive device for rotating the rotating casing IO is omitted.

In Figure 1, the powder 7 is supplied by the airflow as shown by the arrow A7K, enters the Kal booth 43 as described above, and is collected on the surface of the plate 1. If this collection has been sufficiently performed, the casing 10 is rotated once as shown in FIG. Also, along with that, door 13,
The hinge 14 rotates in the direction of arrow A13 to open the door. Then add 1 to the fixed part 15 as shown in Figure 3. The rotating casing 10 rotates, for example, 90 degrees around the center of rotation 16, is stopped by a stopper (not shown), and a hammering device or a vibration device (not shown) is activated in the state shown in FIG. 3. However, the powder 7 collected on the surface of the plate 1 falls into the hopper 8 and is aggregated.

When the above assembly is completed, move the casing 10 for one rotation to the opposite arrow A.
It is rotated 90 degrees in the IO direction, and the door 13 is closed at 5 as shown in Figure 2, and the powder is collected again.

Next, the details of the example will be described.1. Is the length L of the main body 4 shown in the iF1 diagram 1? PL~5? It is formed to be approximately FL, and the minute gap 93 is formed to be approximately l m −0,2y−a.

The velocity of the airflow flowing through the main body 4 is 0.05WL/Q.
~1.07 PL/S, and the Reynolds-induced FLe of this air flow is approximately lθ or less in the case of air at room temperature.

That is, a completely laminar flow is formed. Powder that floats and flows in this state has a very high possibility of causing agglomeration.For example, powder with a particle size of 1 μm becomes a particle size of 10 μm, and in this case, the limit speed of free fall is about 0.3aa10 Therefore, within one main body 4, for example, the residence time in a minute gap of 0.5 fi (L=2-).

If v = 0.2 fPL/s, the powder is agglomerated so that it falls sufficiently onto the plate 1 within 10 seconds),
Collected by sedimentation.

Functions like this are very useful.

The second function is to produce particularly fine powders, that is, ultrafine powders (
0.01Am - 1.0μ"L grain size), the displacement due to Brownian motion (mean free path) is very large, 0.
, 1 try yn / B ~ 1.0--/ S, so for example, 0.2 WL? The probability of adhesion to the surface of the plate 1 is extremely high, since it passes through the PL class minute gap [3] after a few seconds.

Due to these two functions, namely, sedimentation due to agglomeration of powder and transfer to the surface of the plate 1 due to Brownian interlocking, powder can be collected with extremely high collection efficiency. As the plate 1, for example, a thin stainless steel plate or a thin plate of a polymer material coated with metal was used.

Next, the method for forming the minute gap 3 in the plate body 1 will be described. As shown in FIG. It is constructed by overlapping the plate bodies 1 formed in the above manner. In this case, the height of spacer 2 is approximately 1 mm ~
Q, 2yam, manufactured by press etc. Space again? 2 is arranged in an appropriate shape such as a grid pattern or a staggered pattern,
Is the interval approximately 5WL? FL ~ 15myyL.

Next, what is shown in Figures 5 and 6 is one in which the rotation center 16 of the main body 10 is formed in a direction perpendicular to the airflow direction, and by forming it in this way 5, the casing 9 does not rotate. It also has good advantages.

In such a case, as shown in Figure 6, the main body 1 should be
The powder 7 is rotated once and dropped into the hopper 8 by a vibrating device or a hammering device (not shown), but at that time, the air flow is stopped, so it is passed through a bypass (not shown). Or temporarily stop traffic.

In the device formed in this way, the minute gap Va,3 is a planar gap, and the airflow velocity is approximately IWL/0.
Since it is as follows, the length L of the main body 1 is x-n'-3-cm
Even with a long length, the pressure loss is extremely small, less than several tens of millimeters of water column. (At room temperature, when the air flow is air) Next, the one shown in Fig. 7 has the main body 4 inclined in the vertical direction, and the air flow with the powder 7 suspended is shown by the arrow A7.
The powder 7 fed in the direction of the plate IKW is dropped into the hopper 8 by being shaken or hammered in that form. Note that the hopper 8 and the airflow inlet 11 are formed as a slope in the horizontal direction.

Moreover, in the apparatus shown in FIG. 27, there is no problem in supplying the airflow containing suspended powder from above.

Also 1. ? In the case shown in FIG. 8, the plate body 1 is formed into a substantially cylindrical shape, and in this case, it is formed into a concentric circular shape or a front spiral shape.

This type is preferable because it can be easily formed by wrapping the plate 1 having the spacer 2 around the core 17 as shown in the figure. Vertical direction. Alternatively, it may be formed and used as shown in Figure 7.

Effects of the Invention The present invention is constructed as described above, and a main body is formed by overlapping the plate bodies in the thickness direction with a small gap provided by the spacer, and the main body is made to absorb powder by airflow. By providing the minute gap in communication with the passage, there is no clogging as in the conventional apparatus, the processing flow rate is relatively high, the pressure loss is very small, Moreover, it is possible to provide a powder collector with a relatively simple structure.

[Brief explanation of drawings]

Figures O1 to O4 show embodiments of this invention.1. f
Figure 1 is a vertical cross-sectional view of the powder collector, Figure 2 is a view of ■-■ Iwao town in Figure 1-1, Figure 3 is a different state from Figure 2, n-n.
Figure 4 is a detailed view of the part shown in Figure 1, Figures 5 and 6 are cross-sectional views of the powder collector of +9 of this invention. The 6th figure of the spear is 1. Figure 7, a vertical cross-sectional view of the powder collector in a state different from Figure t-5, shows an embodiment of Figure 3 of the present invention, and Figure 8, a longitudinal cross-sectional view of the powder collector, shows this embodiment. FIG. 2 is a cross-sectional view of a powder collector, showing an embodiment of the teeth 4 of the invention. 1... Plate 2... Spacer 3... Minute gap 4... Main body 5... Powder passage

Claims (1)

[Claims] A main body is formed by overlapping the plate bodies in the thickness direction with a small gap provided by a spacer, and the main body is connected to a passage for the powder by air flow, and the small gap is communicated with the passage. A powder collector characterized by being provided with a