JP2008259935A - Jet mill and method for pulverizing material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve pulverizing efficiency in a limited pulverizing chamber. <P>SOLUTION: A plurality of collision portions X1 to X4 where jet streams are collided in the pulverizing chamber 2 are formed by providing a plurality of nozzle sets 8 in the pulverizing chamber 2. This allows the material P to be pulverized in a plurality of collision portions X1 to X4, thereby enabling the system to efficiently pulverize the material P. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a jet mill that pulverizes a pulverized raw material by collision of a jet stream and a pulverized raw material pulverization method.

  A jet mill is an apparatus that finely pulverizes pulverized raw materials such as toner and calcium carbonate using the collision energy of a jet stream. This jet mill uses a structure in which a plurality of jet nozzles are provided on both sides of a peripheral wall of a pulverization chamber to which a pulverized raw material is supplied, and jet air current is ejected from the outer peripheral side of the pulverization chamber toward the center of the pulverization chamber. These jet nozzles are used as a set of nozzles, and jet air currents ejected from the jet nozzles collide with each other in the pulverizing chamber to finely pulverize the pulverized raw material in the pulverizing chamber.

In such a jet mill, the collision energy acts equally on the pulverized raw material by equalizing the distance from the jet nozzle to the collision point where the jet air current collides so that the kinetic energy collides evenly.
For this reason, conventionally, in jet mills, as disclosed in Patent Document 1 and Patent Document 2, a structure in which jet airflows collide only at the center position of the crushing chamber is used.

Japanese Patent Laying-Open No. 2003-88773 (FIG. 2) Japanese Patent Laying-Open No. 2006-7089 (FIG. 1)

By the way, in a jet mill, an increase in the amount of pulverization is desired. For this purpose, it is required to efficiently pulverize the pulverized raw material in a limited space of the pulverization chamber.
However, in a jet mill in which the collision point where the jet air currents collide is specified as one central point in the pulverization chamber, the collision energy required for pulverizing the pulverized raw material is limited. For this reason, the pulverization amount in the pulverization chamber is limited, and it is difficult to increase the pulverization amount in a pulverization chamber of a limited size.

  Therefore, it is conceivable to increase the size of the pulverization chamber in order to increase the amount of pulverization, but even if the size is increased, the amount of pulverization is not increased. This is because when the pulverization chamber is enlarged (increased in diameter), the distance between the collision point where the jet airflows collide with the jet nozzles on the peripheral wall of the pulverization chamber is increased.

  In this case, as the pulverization chamber becomes larger, the flow velocity of the jet airflow that reaches the collision point decreases, resulting in a decrease in the collision energy required for pulverization. That is, only the pulverization efficiency of the pulverized raw material is reduced, and the amount of pulverization is not increased.

  As countermeasures, it is conceivable to increase the capacity of the compressor constituting the high-pressure gas source that supplies the jet stream or to increase the pressure. However, this is difficult to realize because the capacity of the compressor becomes excessive and the equipment costs increase. In addition, it is conceivable to increase the number of jet nozzles attached to the peripheral wall of the crushing chamber as the crushing chamber becomes larger (increase in diameter).

  However, since there is only one collision point where the jet stream collides, simply increasing the number of jet nozzles decreases the jet nozzle arrangement angle (allocation angle) and increases the number of jet nozzles. The collision energy supplied to the slab decreases (specifically, the maximum is 180 degrees and decreases toward O degrees), and the pulverization performance of the jet mill is impaired. For this reason, the conventional jet mill cannot be expected to increase the pulverization amount.

  This invention is made | formed paying attention to the said situation, and makes it a subject to provide the jet mill which improves the grinding | pulverization efficiency in the limited grinding | pulverization chamber.

In order to solve the above-mentioned problem, the invention of claim 1 is a jet mill in which a pulverization chamber to which a pulverized raw material is supplied and a jet air flow which is provided in the pulverization chamber and jets in the pulverization chamber collide with each other. A plurality of jet nozzles positioned as one set, and a plurality of sets of the nozzle sets are arranged so as to form a plurality of collision points where the jet air current collides in the pulverization chamber It was.
With this configuration, the jet mill has a plurality of collision locations where the jet air current collides in the pulverization chamber, so that the pulverized raw material is pulverized at the plurality of collision locations. Thereby, the pulverized raw material is efficiently pulverized in the pulverization chamber.

According to a second aspect of the present invention, in the jet mill, the nozzle set is disposed on an outer peripheral side of the pulverization chamber and jets a jet stream toward the center of the pulverization chamber; The second jet nozzle is disposed on the center side and jets a jet stream so as to collide with the jet stream ejected from the first jet nozzle.
With this configuration, the jet mill can increase the number of nozzle sets according to the size of the crushing chamber by the circumferential length of the peripheral wall of the crushing chamber.

According to a third aspect of the present invention, in the jet mill, the first jet nozzle and the second jet nozzle of each nozzle set are arranged on the same radiation centering on the center of the grinding chamber, and a plurality of sets The nozzle set is arranged in a circumferential direction along a circumference concentric with the center to form one nozzle row group.
With such a configuration, the jet mill effectively uses the internal space of the crushing chamber, and a plurality of jet air current collision points are easily formed. In particular, since the first jet nozzle and the second jet nozzle are arranged concentrically, it is easy to keep the distance between the first jet nozzle and the second jet nozzle constant.

According to a fourth aspect of the present invention, in the jet mill, a plurality of nozzle row groups arranged in the circumferential direction are arranged at different distances from the center of the crushing chamber.
With this configuration, the jet mill can easily secure a large number of jet air current collision points, and can easily keep the distance between the first jet nozzle and the second jet nozzle constant.

According to a fifth aspect of the present invention, in the jet mill, a plurality of the nozzle sets are arranged so as to form a horizontal linear row to form one nozzle row group.
With this configuration, the jet mill has a simple structure and can increase the number of collision points where the jet air current collides in the grinding chamber.

The invention of claim 6 is configured such that in the jet mill, a plurality of nozzle array groups arranged in a straight line are arranged in the horizontal direction of the crushing chamber.
With this configuration, the jet mill has a plurality of nozzle row groups each including the first jet nozzle and the two jet nozzles along the horizontal direction of the crushing chamber. Even though it is a nozzle, it can effectively use the entire horizontal plane of the crushing chamber and increase the number of collision points where the jet stream collides.

According to a seventh aspect of the present invention, in the jet mill, a plurality of nozzle row groups arranged in the circumferential direction are arranged in the vertical direction of the crushing chamber.
With this configuration, the jet mill has a plurality of nozzle row groups arranged in the circumferential direction along the vertical direction of the crushing chamber. By effectively using the space in the vertical direction of the chamber, it is possible to increase the number of collision points where the jet stream collides.

The invention of claim 8 is configured such that in the jet mill, a plurality of nozzle array groups arranged in a straight line are arranged in the vertical direction of the crushing chamber.
By configuring in this way, the jet mill has a plurality of nozzle row groups arranged in a straight line along the vertical direction of the pulverization chamber, so that the space in the vertical direction of the pulverization chamber is effectively utilized, Increases the number of collision points where the jet stream collides.

The invention of claim 9 is configured such that, in the jet mill, the plurality of nozzle row groups arranged in the up-down direction are arranged so that the collision locations where the jet air current collides do not overlap each other in the up-down direction.
With this configuration, the jet mill can suppress the pulverization loss of the pulverized material caused by the collision of the jet air currents colliding with each other.

According to a tenth aspect of the present invention, in the jet mill, the nozzle set includes a set of three or more jet nozzles positioned so as to collide each jet air stream to be injected.
With this configuration, the jet mill can increase the number of collision points where the jet stream collides even when three or more jet nozzles are used. Preferably, the plurality of nozzle sets is a set of three or more jet nozzles arranged separately on the outer peripheral side and the central side of the crushing chamber, which are arranged in the circumferential direction in the crushing chamber, When three or more jet nozzles arranged on both sides with a pair are arranged in a vertical direction in the pulverization chamber, the space in the pulverization chamber can be obtained even though the configuration uses three or more jet nozzles. Can be used effectively to increase the number of collisions where the jet stream collides.

The invention of claim 11 is a pulverizing raw material pulverization method by a jet mill in order to obtain the method for achieving the above object, and has a plurality of collision points where the jet air currents injected from a plurality of jet nozzles collide. By supplying the pulverized raw material into the pulverizing chamber, the pulverized raw material is made to flow and pulverized by a jet stream jetted from the jet nozzle to the plurality of collision locations.
In the pulverized raw material pulverization method as described above, since there are a plurality of collision portions where the jet air current collides in the pulverization chamber, the pulverized raw material is pulverized at the plurality of collision portions.

  According to the first and eleventh aspects of the invention, since the pulverized raw material is pulverized at a plurality of collision locations in the pulverization chamber, the pulverized raw material can be efficiently pulverized. Thereby, the amount of pulverization can be increased regardless of the size of the pulverization chamber of a limited size, that is, the pulverization chamber.

  Accordingly, the pulverizing ability of the jet mill can be improved. In particular, since the pulverizing ability of the jet mill is not affected by the size of the pulverizing chamber, it is effective for a jet mill using a large pulverizing chamber. In addition, the supply source for supplying the jet airflow is not subjected to an excessive burden in terms of structure and cost, and can be easily realized.

  According to the invention of claim 2, the number of the first and second jet nozzles can be increased by utilizing the circumferential length of the peripheral wall of the crushing chamber, and the collision location can be determined according to the size of the crushing chamber. It can be increased to the physically possible range.

  According to the invention of claim 3, particularly, the internal space of the crushing chamber can be effectively used to form a number of locations where the jet air current easily collides. In addition, since the distance between the first nozzle and the second sill is easily kept constant, unnecessary performance degradation can be suppressed.

  According to the invention of claim 4, it is possible to further secure a large number of collision points where the jet air current collides more easily. In addition, since the distance between the first nozzle and the second nozzle is kept constant while ensuring a short distance, a larger amount of pulverization can be increased.

  According to the invention of claim 5, it is possible to increase the number of collision locations where the jet air current collides in the pulverization chamber with a simple structure.

  According to the invention of claim 6, by effectively utilizing the linear arrangement of the first and second jet nozzles, in the horizontal direction of the crushing chamber, it is possible to form a number of collision points where the jet air current collides, It is possible to improve the pulverization efficiency of the jet mill.

  According to the invention of claim 7 and claim 8, by effectively utilizing the circumferential direction or the linear arrangement of the first and second jet nozzles, the collision location where the jet air current collides is also found in the vertical direction of the crushing chamber. Many can be formed, and the pulverization efficiency of the jet mill can be improved.

  According to the ninth aspect of the present invention, the pulverization loss of the pulverized material due to the fact that the jet air currents interfere with each other at the collision location is suppressed, and the pulverized material can be effectively pulverized.

  According to the tenth aspect of the present invention, it is possible to increase the number of collision locations where the jet air current collides using three or more jet nozzles.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side sectional view showing the overall configuration of the jet mill of the present invention, FIG. 2 is a partially sectional perspective view for explaining the details of the main part of FIG. 1, and FIG. 3 is a jet mill. It is a plane sectional view in the AA line in Drawing 1 showing the inside.

  As shown in FIG. 1, the casing 1 has a bottomed cylindrical shape arranged vertically. A crushing chamber 2 is formed at the bottom of the casing 1 using the bottom space. A hopper 7 is installed on a peripheral wall on the lower side of the casing 1 via a raw material supply pipe 3 and an opening / closing valve 4, and a pulverized raw material P such as toner or calcium carbonate is pulverized from the hopper 7. 2 is supplied.

  As shown in FIG. 1, a plurality of nozzle sets 8 for pulverizing the pulverized raw material P contained in the pulverizing chamber 2 with jet airflows (airflows ejected at high speed) K1 and K2 are disposed. The nozzle set 8 includes a set of nozzles that use a plurality of jet nozzles, for example, two of the first jet nozzle 5a and the second jet nozzle 5b, as a set. It is used. A plurality of nozzle sets 8 are arranged in the crushing chamber 2, and as shown in FIGS. 1 to 3, in the crushing chamber 2, there are a plurality of collision locations where the jet airflows K 1, K 2 collide, 4 here. Two collision points X1 to X4 (only two points are shown in FIG. 1) are formed.

  For example, four first jet nozzles 5a are formed on the outer peripheral side of the crushing chamber 2, for example, the inner surface of the peripheral wall 2a constituting the crushing chamber 2, as shown in FIGS. The jet air stream K1 is arranged so as to be jetted to the center of the crushing chamber 2, and four second jet nozzles 5b combined with the first jet nozzle 5a are arranged in the center of the crushing chamber 2 with the jet air stream K2 from the jet nozzle 5b. Is used in such a manner that it is disposed so as to collide with the jet airflow K1 ejected from the first jet nozzle 5a.

  In the arrangement of the first and second jet nozzles 5a and 5b, a plurality of jet nozzles 5a are concentrically arranged around the center of the crushing chamber 2 so that the crushing raw material P accumulated in the crushing chamber 2 can be effectively flowed. A configuration in which a plurality of jet nozzles 5b are arranged is used. This arrangement refers to an arrangement relationship in which only the axial center positions are shared. In addition to the arrangement facing each other on the horizontal plane, the relative positions of the jet nozzles 5a and 5b are stepped up and down and are on the inclined plane (inclined plane). The arrangement | positioning in the case where it becomes the state which the arrangement | positioning which opposes above) or a set of collision location X1-X4 is not in the same height is also included.

  In this embodiment, in order to be suitable for implementation, a configuration is used in which the jet nozzles 5a and 5b are arranged concentrically around the center in the crushing chamber 2 (concentric). Specifically, a plurality of jet nozzles 5 a and a plurality of jet nozzles 5 b are arranged in the circumferential direction around the axis of the crushing chamber 2. Thereby, the collision locations X1-X4 where the jet airflows K1, K2 collide are formed around the axis of the crushing chamber 2.

  In particular, in the present embodiment, as shown in FIG. 2, the first jet nozzles 5a are arranged at equal intervals, for example, 90 degrees, at positions on the peripheral wall 2a that are in the same horizontal plane, here on the same horizontal plane immediately above the bottom. The four jet nozzles 5b are arranged at the same height and pitch as the first jet nozzles 5a on the outer peripheral surface of the circular nozzle mounting seat 11 formed at the center of the crushing chamber 2. The arrangement of arranging them on concentric circles is used. The jet port portions formed at the tip portions of both jet nozzles 5a, 5b are facing each other, so that both jet nozzles 5a, 5b are arranged on the same radiation, and in an equal position in the crushing chamber 2, Four collision points X1 to X4 where the jet airflows K1 and K2 collide are formed.

  With the arrangement of the first jet nozzle 5a and the second jet nozzle 5b, when the collision energy due to the jet stream is applied to each of the collision locations X1 to X4, the pulverized raw material P is deposited on the entire layer of the pulverized raw material P accumulated in the pulverization chamber 2. A flow phenomenon that promotes pulverization is generated. Of course, a flow phenomenon occurs in the pulverized raw material P even in a concentric arrangement in which the nozzle positions are shifted up and down as in the case described above.

  As shown in FIG. 1, the four nozzle sets 8 are connected to a high-pressure gas source 15 such as a compressor that supplies high-pressure gas such as air or nitrogen through high-pressure gas supply pipes 13. Thereby, collision of jet air currents is performed in four collision locations X1-X4. That is, the pulverized raw material P in the pulverization chamber 2 is pulverized by the collision of the jet airflows K1 and K2 generated at the respective collision locations X1 to X4.

  On the other hand, a classification chamber 17 is formed in the upper part of the casing 1. In the classification chamber 17, for example, an airflow classifier 19 is provided. The classifier 19 sucks up the powder having a small particle size, which has been swung upward from the crushing chamber 2, to the outside of the casing 1, and collects it with a dust collector (not shown) installed outside. ing.

Next, the operation of the jet mill configured as described above will be described together with a method for pulverizing the pulverized raw material P.
A case where the pulverized raw material P in the hopper 7 is pulverized will be described as an example. First, for example, the opening / closing valve 4 is opened, and the pulverized raw material P (toner, calcium carbonate, etc.) in the hopper 7 is dropped.

  Thereby, the pulverized raw material P in the hopper 7 falls as indicated by an arrow in FIG. 1 and is supplied into the pulverization chamber 2 at the bottom of the casing 1 while freely falling in the casing 1. Thus, the pulverized raw material P is accumulated in the pulverization chamber 2. 1 and 2 indicates a layer of the pulverized raw material P at that time.

  On the other hand, high-pressure gas, for example, high-pressure air, is supplied from the high-pressure gas source 15 to the jet nozzles 5a and 5b through the high-pressure gas supply pipes 13, respectively. Thereby, high pressure air is each injected from the jet nozzle part of jet nozzle 5a, 5b.

  Here, since the injection port portions of the jet nozzles 5a and 5b face each other, as shown in FIGS. 1 to 3, the jet air streams K1 and K2 of the high-pressure air injected from the four sets of jet nozzles 5a and 5b are , They collide at four collision points X1 to X4 in the crushing chamber 2, respectively. The pulverized raw material P is pulverized by the collision energy at this time. That is, the pulverized raw material P is pulverized in each part in the pulverization chamber 2.

  In response to the collision of the jet airflows K1, K2, the fluidized bed that flows in the space of the grinding chamber 2 is formed on the grinding raw material P. That is, in each collision location X1-X4, the flow of the jet airflows K1, K2 ejected from the jet nozzles 5a, 5b, the flow of the jet airflow K1, K2 diffusing around after the collision in each collision location X1-X4, A behavior of causing the pulverized raw material P to flow in the lateral direction in the pulverization chamber 2 occurs.

  At this time, since the jet nozzles 5a and 5b are arranged concentrically with the center of the crushing chamber 2 as the center, the crushing raw material P in the crushing chamber 2 enters and mixes at each of the collision locations X1 to X4. It flows in the horizontal direction (radial direction) and vertical direction. This flow state will be further described. Among the pulverized raw material P, the pulverized raw material P flows in the layer portion from the bottom of the pulverizing chamber 2 to at least the jet nozzles 5a and 5b, specifically, at least the upper part of the nozzle is hidden. To do.

  The pulverized raw material P has a collision or friction between the raw materials brought about by this flow, a collision or friction with the peripheral wall 2a, a collision or friction with the upper surface of the nozzle mounting seat 11, a nozzle mounting seat 11 and the peripheral wall 2a around it. It is also pulverized by repeated collision or friction with the wall of the annular groove. In particular, when a plurality of collision points X1 to X4 with which the jet airflows K1 to K4 collide are set by the concentric arrangement of the jet nozzles 5a and 5b, the collision points X1 to X4 are formed in the radial direction on the same plane. A good flow is easily induced in the entire horizontal direction in the pulverization chamber 2, and the pulverization proceeds effectively.

  The pulverized raw material P is finely pulverized by collision or friction repeatedly performed by the flow of the fluidized bed by the jet airflows K1 and K2. Then, the powder obtained by pulverization rises and moves to the classification chamber 17 at the upper part of the casing 1.

  This powder is sucked up by a classifier 19 installed in the classifying chamber 17. Then, the same classifier 19 separates the fine powder P1 into the coarse powder P2, and the fine powder P1 is collected by a dust collector (not shown). The coarse powder P2 falls again into the crushing chamber 2 and is crushed again by collision or friction by the jet airflows K1 and K2. By repeating this, the pulverized raw material P in the pulverizing chamber 2 is finely pulverized to the required particle size.

Thus, since the pulverization raw material P in the pulverization chamber 2 is performed at the collision locations X1 to X4 (plural) where the jet airflows K1 and K2 collide, the pulverization efficiency of the pulverization raw material P is improved.
Therefore, the jet mill can increase the pulverization amount of the pulverized raw material P regardless of the size of the pulverization chamber 2 even if the capacity of the pulverization chamber 2 is limited.

  As a result, the grinding ability of the jet mill can be improved. In addition, the improvement of the crushing capability is achieved only by increasing the number of collision points where the jet airflows K1, K2 collide, so that an excessive burden is not imposed on the high-pressure gas source 15. For this reason, since a structural burden and a cost burden are suppressed, there exists an advantage which can attain the enlargement of the crushing chamber 2 easily.

  Particularly, a plurality of first jet nozzles 5a are arranged on the outer peripheral side of the crushing chamber 2, and a plurality of second jet nozzles 5b are arranged in the center of the crushing chamber 2 to collide the jet airflows K1 and K2. When X4 (plurality) is formed, the number of the first and second jet nozzles 5a and 5b can be increased by using the circumferential length of the peripheral wall 2a of the crushing chamber 2, so that the crushing raw material P can be easily crushed. The number of collision points can be increased to the physically possible range.

  For this reason, even in the large crushing chamber 2, it is possible to easily cope with an increase in the crushing amount. In addition, when the first jet nozzle 5a and the second jet nozzle 5b are arranged concentrically around the center of the crushing chamber 2 (concentric), the internal space of the crushing chamber 2 can be used effectively. Thus, the collision locations X1 to X4 of the plurality of jet airflows can be increased.

  Particularly, when the jet nozzles 5a and 5b are arranged concentrically, the jet nozzles 5a and 5b can be easily kept constant at a short distance, and an active fluidized bed can be easily obtained over the entire surface of the crushing chamber 2. For this reason, the pulverized raw material P can be pulverized efficiently. This is because the distance between the jet nozzles 5a and 5b can be short, so that a decrease in the flow velocity of the jet airflows K1 and K2 can be suppressed. For this reason, even if the crushing chamber 2 is enlarged, a high-performance crushing capability can be secured. In addition, when considering a set of one each of the first jet nozzle 5a and the second jet nozzle 5b, the first jet nozzle 5a and the second jet nozzle 5b in the set are centered on the center of the crushing chamber 2. If it arrange | positions on the same radiation and arranges the said group in multiple numbers in the circumferential direction, manufacture will be easy.

Next, second to sixth embodiments will be described with reference to FIGS. 4 to 9, the same components as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted.
First, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 shows a plan sectional view of the grinding chamber 2.
This embodiment employs a nozzle array group consisting of a larger number, for example, 8 nozzle groups 8 here, instead of the nozzle array group in which the four nozzle groups 8 listed in the first embodiment are arranged in the circumferential direction. Then, in the crushing chamber 2, the number of collision points where the jet airflows K1, K2 collide are increased to eight. X1 to X8 in FIG. 4 indicate collision points where the jet airflows K1 and K2 collide.
The structure in which the number of nozzle groups 8 in the nozzle row group is increased in this way is effective when the crushing chamber 2 is enlarged.

Next, a third embodiment of the present invention will be described with reference to FIGS. Fig.5 (a) shows the plane sectional view of the crushing chamber 2, and FIG.5 (b) has shown the front sectional view similarly.
The present embodiment is a modification of the first and second embodiments, and includes a group of large and small nozzle arrays arranged in the circumferential direction of the crushing chamber 2 at different points from the center of the crushing chamber 2. It is composed.
For this, the nozzle row of the first jet nozzle 5a and the nozzle row of the second jet nozzle 5b are set as a set of nozzle rows, and a plurality of sets of these are arranged concentrically around the axis of the crushing chamber 2, for example, A concentric circular arrangement is used.

  Specifically, as shown in FIGS. 5 (a) and 5 (b), an annular nozzle mounting seat 11a is formed around a circular nozzle mounting seat 11, and the inner circumferential surface of the nozzle mounting seat 11a is formed. The first jet nozzle 5a that is combined with the second jet nozzle 5b of the nozzle installation seat 11a is disposed, and the second jet nozzle 5b that is combined with the first jet nozzle 5a of the casing 1 is provided on the outer peripheral surface of the nozzle installation seat 11a. A structure in which two groups of large and small nozzle arrays each composed of the first jet nozzle 5a and the second jet nozzle 5b are arranged in the circumferential direction in the crushing chamber 2 is used.

  The nozzle row group configured in such an arrangement can form a large number of collision points where the jet airflows K1 and K2 collide in the crushing chamber 2 without changing the size of the crushing chamber 2. In this embodiment, 12 locations can be formed. Reference numerals X1 to X12 in FIG. 5 indicate collision points where the jet airflows K1 and K2 collide. In this case, in particular, the distance between the jet nozzles 5a and 5b can be easily maintained at a short distance, so that the loss of collision energy can be suppressed and an increase in the amount of powder processing can be expected.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. 6 (a) and 6 (b). FIG. 6A shows a plan sectional view of the grinding chamber 2, and FIG. 6B shows a front sectional view.
In the present embodiment, the first jet nozzle 5a and the second jet nozzle 5b are annularly arranged in the crushing chamber 2 as in the first to third embodiments, and the collision location where the jet airflows K1 and K2 collide with each other. In the pulverization chamber 2, the nozzle row α of the horizontal first jet nozzles 5 a arranged in a straight line and the second horizontal jet nozzles 5 b arranged in a straight line so as to face the same are arranged in the grinding chamber 2. Are arranged so as to form a plurality of collision points where jet airflows K1 and K2 (not shown in the figure are omitted) collide with each other.

  Specifically, for example, a plurality of nozzle installation seats 21 extending in a straight line in the direction crossing the crushing chamber 2 are formed in parallel at the bottom of the crushing chamber 2, and the side surfaces of the two adjacent nozzle installation seats 21, 21 are opposed to each other. The plurality of first jet nozzles 5a are arranged in a horizontal straight line at a predetermined interval, and the plurality of second jet nozzles 5b are disposed on the other side of the nozzle mounting seats 21, 21 facing each other. Are aligned in a horizontal straight line, and the jet port portion at the tip of the first jet nozzle 5a and the jet port portion of the second jet nozzle 5b are faced in the crushing chamber 2 so that the jet airflow K1, A structure for injecting K2 is used. With such a structure, the linear nozzle row α formed by the first jet nozzle 5a and the linear nozzle row β formed by the second jet nozzle 5b are arranged in parallel in the crushing chamber 2 to form a nozzle row group. It is possible to form a large number of collision points where the jet airflows K1 and K2 collide with a simple structure.

  In addition to this, the present embodiment also employs a device that can effectively utilize the entire horizontal surface of the crushing chamber 2 to increase the number of collision points where the jet airflows K1, K2 collide. In this device, the nozzle row α having the first jet nozzles 5a and the nozzle row β having the second jet nozzles 5b are defined as a set of nozzle rows G, and a plurality of nozzle row groups G are set in the horizontal direction. Here, a structure in which three sets are arranged in parallel is used. Each nozzle row group G is arranged at a predetermined interval.

  As a result, even in the structure in which the jet nozzles 5a and 5b are arranged in a straight line, a large number of jet airflows are formed on the entire horizontal plane at the bottom in the crushing chamber 2 as in the first to fourth embodiments. A collision point where K1 and K2 collide can be formed. Reference numerals X1 to X11 in FIG. 6 indicate collision points where the jet airflows K1 and K2 collide.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. 7 (a) and 7 (b) and FIGS. 8 (a) and 8 (b). FIG. 7A shows a perspective view in which a part of the crushing chamber 2 is cut out, FIG. 7B shows a plan sectional view taken along line BB in FIG. 7A, and FIG. FIG. 8 is a plan sectional view taken along line CC in FIG. 7 (DD line and the following lines are not shown), and FIG. 8B is a plan sectional view taken along line DD in FIG. .
This embodiment is a modification of the fourth embodiment. As shown in FIG. 7, the jet nozzles 5a and 5b are arranged in a plurality of groups, each of which includes a linear nozzle array α and β as a set of nozzle arrays G. Here, a structure is used which has a nozzle arrangement in which three sets are arranged in the plane direction in FIG. 8 and arranged in two layers in the vertical direction, which is the through direction in FIG.

  Specifically, as shown in FIG. 8 (b), a plurality of nozzle row groups G arranged in parallel in the horizontal direction and arranged at the bottom of the crushing chamber 2 are used as the first layer. On the upper side of the stage, as shown in FIG. 8 (a), a plurality of sets of nozzle rows G arranged in parallel in the horizontal direction are arranged as a second stage layer, and the jet air flow K1, The collision location where K2 collides is obtained in both the first stage and the second stage. A plurality of nozzle row groups G are arranged in the vertical direction, and only one nozzle row group G including one set of jet nozzles 5a and 5b is arranged in the first stage, and one set of jet nozzles 5a in the second stage. , 5b, the nozzle array group G may be arranged.

If it does in this way, although it is a simple structure, the collision location where jet airflow K1, K2 collides can be increased markedly. Reference numerals X1 to X17 in FIG. 7 indicate collision points where the jet airflows K1 and K2 collide.
In particular, FIG. 7 shows that the first-stage jet nozzles 5a and 5b are arranged so that the collision points X1 to X17 where the jet airflows K1 and K2 collide do not overlap vertically in the first-stage layer and the second-stage layer. The mutual position of the set and the set of the second stage jet nozzles 5a and 5b is shifted. Here, the positions of the first stage and the second stage are shifted so as to rotate in the horizontal direction, for example, 90 degrees. By shifting in this way, the pulverization loss due to the fact that the jet airflows K1 and K2 interfere with each other at the collision location is suppressed, so that the pulverized raw material P can be effectively pulverized.

In addition, as the positional deviation between the first stage and the second stage increases (the collision position does not overlap vertically), the entire horizontal plane in the pulverization chamber 2 is utilized to increase the number of collision positions X1 to X17. Can be formed. In the present embodiment, the nozzle mounting seat 21 of the first layer is positioned immediately below the collision position of the second layer so as to increase the efficiency of pulverization.
In the structure in which a plurality of sets of jet nozzles 5a and 5b are arranged in the vertical direction, only one set of jet nozzles 5a and 5b is provided in the first stage, and only one set of jet nozzles 5a and 5b is provided in the second stage. A structure that is arranged may be used.

  In the present embodiment, for example, the first-stage jet nozzles 5a and 5b are supported by using the linear nozzle mounting seat 21 described in the fourth embodiment, for example, the second-stage jets. For the installation of the nozzles 5a and 5b, the high-pressure gas supply pipe 13 with the jet nozzles 5a and 5b is allowed to traverse the pulverization chamber 2 as it is, and the tip and base of the high-pressure gas supply pipe 13 are connected to the peripheral wall of the pulverization chamber 2. The structure supported by 2a is used. Of course, any support structure may be used as long as the nozzle rows α and β of the jet nozzles 5a and 5b are supported at predetermined positions.

Next, a sixth embodiment of the present invention will be described with reference to FIG. FIG. 9 shows a plan sectional view of the grinding chamber 2.
This embodiment is a modification of the first and second embodiments. This embodiment is different from the example using a plurality of nozzle sets in which the two jet nozzles are set as one set in the first and second embodiments, and a plurality of sets in which three or more jet nozzles are set as one set. A plurality of collision locations where jet air current collides are formed in the grinding chamber using a nozzle set.

  This embodiment uses a nozzle set in which three or more jet nozzles that jet a jet stream toward one focal point are used as a set, and a plurality of nozzle sets, for example, eight sets, are arranged in the circumferential direction in the grinding chamber. It is set. Specifically, among the three jet nozzles 5a to 5c of the plurality of nozzle sets 8, for example, two jet nozzles 5a and 5b are arrayed at a predetermined pitch at the same horizontal position on the peripheral wall 2a of the crushing chamber 2, The remaining jet nozzles 5c are arranged concentrically at the center of the crushing chamber 2 at a pitch located between the jet nozzles 5a and 5b.

  Each of the three jet nozzles 5a to 5c is arranged so that the injection port portion faces the center between the nozzles, and each jet nozzle 5a to 5c is arranged in the middle of each of the triangular nozzles. The collision location where jet air currents K1 to K3 ejected from the nozzles 5a to 5c collide is formed. Thereby, in the pulverization chamber 2, collision points where the jet airflows K1 to K3 collide are formed at eight positions in the circumferential direction. The code | symbol X1-X8 in FIG. 9 has shown the collision location where the jet airflow K1-K3 collides.

  Even if it does in this way, there exists an effect similar to 1st-3rd embodiment. Needless to say, the nozzle set 8 may be configured by four jet nozzles or a combination of more nozzles. In addition, the nozzle set that is one set of three or more jet nozzles is a structure in which a plurality of concentric circles are arranged and arranged as in the third embodiment, or a nozzle set that is linear in the fourth and fifth embodiments. You may apply to the structure which arranges.

  In addition, when three or more jet nozzles 5a to 5c are used, a plurality of sets are arranged in the circumferential direction of the crushing chamber as in the sixth embodiment. It may be arranged to form a plurality of collision points in the grinding chamber. In this case, for example, it is conceivable that three or more jet nozzles arranged on both sides with the center of the grinding chamber as one set are arranged in the vertical direction in the grinding chamber.

  The present invention is not limited to the first to sixth embodiments described above, and various modifications may be made. For example, a configuration in which a row of nozzle groups (nozzle row group) is arranged in the circumferential direction as in the first to third embodiments may be configured to form a plurality of layers above and below, It is desirable to shift the phase in the circumferential direction so that the collision positions do not overlap with each other. In addition, for example, in the above-described embodiment, an example using a jet nozzle that collides a jet stream from the lateral direction is given, but not limited thereto, for example, using a jet nozzle that collides a jet stream from above and below, You may make it form the collision location where a jet air current collides in multiple places in a grinding | pulverization chamber.

It is a sectional side view which shows the jet mill which concerns on 1st Embodiment of this invention with the behavior by which a grinding | pulverization raw material is grind | pulverized. It is the perspective view which carried out the partial cross section which shows the nozzle structure inside the jet mill. It is a plane sectional view in the AA line in FIG. It is a top view of the jet mill which concerns on 2nd Embodiment of this invention. (A) is a plane sectional view of a jet mill concerning a 3rd embodiment of the present invention, and (b) is a front sectional view similarly. (A) is a plane sectional view of a jet mill concerning a 4th embodiment of the present invention, and (b) is a front sectional view similarly. (A) is the perspective view which carried out the partial cross section which shows the nozzle structure inside the jet mill which concerns on the 5th Embodiment of this invention, (b) is a plane in alignment with the BB line in Fig.7 (a). It is sectional drawing. (A) is the plane sectional view which follows the CC line in Drawing 7, (b) is the plane sectional view in the DD line in Drawing 7 similarly. It is a plane sectional view of the jet mill concerning a 6th embodiment of the present invention.

Explanation of symbols

1 Casing 2 Crushing chamber 5a First jet nozzle
5b Second jet nozzle 7 Hopper 8 Nozzle set 15 High pressure gas source K1, K2 Jet airflow P Crushed raw material X1-X17 Collision point where jet airflow collides α Nozzle row formed by first jet nozzle β Nozzle row made by second jet nozzle

Claims (11)

A crushing chamber to which crushing raw materials are supplied;
A nozzle set that is provided in the pulverization chamber and includes a plurality of jet nozzles that are positioned so as to collide with each other's jet air currents injected in the pulverization chamber;
A jet mill, wherein a plurality of the nozzle sets are arranged so as to form a plurality of collision locations where the jet air current collides in the crushing chamber.   The nozzle set is disposed on the outer peripheral side of the pulverization chamber and ejects a jet stream toward the center of the pulverization chamber; and the nozzle set is disposed on the center side of the pulverization chamber from the first jet nozzle. The jet mill according to claim 1, further comprising a second jet nozzle that ejects the jet stream so as to collide with the jet stream.   The first jet nozzle and the second jet nozzle of each nozzle set are arranged on the same radiation centering on the center of the crushing chamber, and a plurality of nozzle sets are arranged on a circumference concentric with the center. The jet mill according to claim 2, wherein the nozzle mill is arranged in a circumferential direction along one nozzle row group.   4. The jet mill according to claim 3, wherein a plurality of nozzle row groups arranged in the circumferential direction are arranged at different points from the center of the crushing chamber. 5.   2. The jet mill according to claim 1, wherein a plurality of the nozzle sets are arranged so as to form a horizontal linear row to form one nozzle row group.   The jet mill according to claim 5, wherein a plurality of nozzle row groups arranged in a straight line are arranged in a horizontal direction.   The jet mill according to claim 3 or 4, wherein a plurality of nozzle row groups arranged in the circumferential direction are arranged in the vertical direction of the crushing chamber.   The jet mill according to claim 5 or 6, wherein a plurality of the nozzle row groups arranged in a straight line are arranged in a vertical direction of the crushing chamber.   9. The jet mill according to claim 7, wherein each of the plurality of nozzle row groups arranged in the vertical direction is arranged so that a collision location where the jet air current collides does not overlap with each other in the vertical direction. .   2. The jet mill according to claim 1, wherein the nozzle set includes a set of three or more jet nozzles positioned so as to collide each other jet airflow to be jetted. A method for pulverizing a pulverized raw material by a jet mill, wherein the pulverized raw material is a jet by supplying the pulverized raw material into a pulverizing chamber having a plurality of collision points where the jet air currents ejected from a plurality of jet nozzles collide with each other. A method for pulverizing a pulverized raw material, wherein the material is pulverized by being brought into a fluidized state by a jet stream jetted from a nozzle to the plurality of collision points.

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