Fluidized bed jet mill

Abstract

The utility model relates to a fluidized bed jet mill which comprises a cylinder body, a fine powder channel, a powder classifier, a powder supply device, at least one pair of powder spray pipes, a fine powder channel, a fine powder channel, a fine powder channel, a fine powder channel, a fine powder channel, a fine powder channel, a fine powder channel, a fine powder channel, a fine powder channel, a fine powder channel, a fine powder channel and at least one pair of powder spray pipes, the powder spraying pipes are installed on a barrel of the crushing chamber, outlets of each pair of powder spraying pipes are oppositely arranged in the crushing chamber in the radial direction, inlets of the powder spraying pipes are connected with the first Venturi powder pumps respectively, and coarse powder returning pipes are connected between powder inlets of the first Venturi powder pumps and the coarse powder channel. Therefore, coarse powder separated from the grading chamber is crushed in the crushing chamber. Coarse powder mixed with high-pressure airflow collides in the crushing chamber through the powder spray pipe, so that collision is targeted, only coarse powder is beaten, the crushing efficiency is improved, the crushing effect is greatly improved, and the particle size of the powder is effectively controlled.

Description

Technical Field

[0001] The utility model relates to the field of powder crushing equipment, in particular to a fluidized bed air flow mill. Background Art

[0002] There are many types of air jet mills, the main type is the impact air jet mill. Up to now, the fluidized bed air jet mill is generally recognized as the best and most common type of air jet mill.

[0003] Conventional fluidized bed jet mills Figure 1 As shown, it includes a cylindrical barrel 10, with a feed pipe 11 in the middle, at least a pair of high-pressure nozzles 12 at the bottom, and a motor and powder classification impeller 13 installed at the top. A screw conveying device or a Venturi pump conveying device adds the required powder through the feed pipe. The high-pressure gas ejected from the opposing high-pressure nozzles usually reaches supersonic speed, causing the powder in the barrel to collide with each other, and the high-speed collision of the powder is crushed. The motor drives the classification impeller to rotate, and the extraction inside the classification impeller extracts the finer powder to be collected and recycled in subsequent recovery devices such as cyclone separators or collectors. We control the fineness of the powder to be separated by controlling the speed of the classification impeller. The faster the speed, the finer the particle size.

[0004] Traditional fluidized bed jet mills have several disadvantages. First, after the high-pressure airflow is ejected from the nozzle, it is difficult to drive enough powder to collide within a very short distance and time. Second, no matter whether the powder is coarse or fine, there is a chance that it will be driven to collide and crush again, causing the powder that has been crushed to the required fineness to be further crushed. The powder particle size cannot be controlled, and a fine powder product with an undesirable particle size distribution is obtained. Utility Model Content

[0005] The technical problem to be solved by the present invention is: to overcome the deficiencies of the existing technology and provide a fluidized bed airflow to solve the technical problem that in the past, it was difficult for the airflow mill to drive enough powders to collide with each other in a very short distance and in a very short time during operation, and that both coarse powder and fine powder have the opportunity to be driven to collide and crush again, so that the powder that has been crushed to the required fineness is further crushed, thereby obtaining unnecessary ultrafine powder.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] First aspect:

[0008] Provided is a fluidized bed jet mill, comprising

[0009] A cylinder, wherein a grading chamber, a powder feeding chamber and a crushing chamber are sequentially arranged in the cylinder from top to bottom, the grading chamber is connected to the fine powder channel and the coarse powder channel, and the fine powder channel is connected to the exhaust system;

[0010] A powder classifier is installed in the classification chamber, and an air outlet of the powder classifier is connected with the fine powder channel, so that the fine powder separated by the powder classifier is discharged from the fine powder channel.

[0011] A powder supply device is connected with the powder inlet chamber and is adapted to input the powder into the powder inlet chamber.

[0012] At least one pair of powder nozzles is installed on the barrel of the crushing chamber, and the outlets of each pair of powder nozzles are arranged in a diametrically opposite manner in the crushing chamber, and the inlets of the powder nozzles are respectively connected with the first Venturi powder pump, and a coarse powder return pipe is connected between the powder inlet of the first Venturi powder pump and the coarse powder channel, so that the coarse powder separated in the classification chamber is crushed in the crushing chamber.

[0013] Further, the classification chamber and the powder inlet chamber are both cylindrical chambers.

[0014] Further, the powder classifier and the fine powder channel are both located at the top center of the classification chamber.

[0015] The fine powder channel is arranged at the top center of the classification chamber, and the coarse powder channel is arranged at the sidewall of the top of the classification chamber.

[0016] Further, the powder supply device comprises a powder inlet pipe and a second Venturi powder pump, the powder inlet pipe is tangentially arranged on the barrel, and the second Venturi powder pump sends the new powder into the powder inlet chamber through the powder inlet pipe, so that the new powder rotates circumferentially in the powder inlet chamber.

[0017] Further, the powder classifier is a centrifugal classifier.

[0018] The second aspect is:

[0019] A powder manufacturing method is provided, and the fluidized bed jet mill is used, and the method comprises the following steps: the new powder is sent into the powder inlet chamber by the powder supply device, the new powder enters the classification chamber upward under the action of the new powder suction system, the fine powder separated by the powder classifier is discharged from the fine powder channel, the remaining coarse powder is returned to each powder nozzle through the coarse powder return pipe, so that the coarse powder is carried in the high-pressure gas flow sprayed by the powder nozzle, the coarse powder is directly collided when being sprayed, so that the powder is crushed, the crushed powder enters the classification chamber upward again to be classified, the fine powder meeting the requirements is sucked away, and the coarse powder is returned to the powder nozzle again to be collided.

[0020] Further, the new powder enters the powder inlet chamber through the tangentially arranged powder inlet pipe, and the new powder rotates circumferentially in the powder inlet chamber, and the rotating direction of the new powder in the barrel is opposite to the rotating direction of the impeller in the powder classifier.

[0021] The beneficial effects of the present application are:

[0022] The fine powder separated by the powder classifier is directly discharged through the fine powder channel and collected, and the coarse powder is collected through the coarse powder return pipe and sent to the two first venturi powder pumps below, respectively.

[0023] The new powder carried by the second venturi powder pump is input into the tangential input cylinder, so that the new powder can rotate tangentially in the cylinder, which helps the coarse powder to separate to the inner wall of the cylinder and enter the coarse powder channel. BRIEF DESCRIPTION OF DRAWINGS

[0024] The utility model will be further described below with reference to the drawings.

[0025] Figure 1 It is a schematic diagram of a traditional fluidized bed jet mill;

[0026] Figure 2 It is a schematic diagram of a fluidized bed jet mill of the utility model;

[0027] Figure 3 It is a sectional view of the fluidized bed jet mill of the utility model in the crushing chamber;

[0028] Figure 4 It is a sectional view of the fluidized bed jet mill of the utility model in the classification chamber;

[0029] 1, cylinder;

[0030] 2, powder classifier, 21, motor, 22, powder classification impeller;

[0031] 3, powder nozzle, 31, first venturi powder pump;

[0032] 4, second venturi powder pump;

[0033] 51, fine powder channel, 52, coarse powder channel. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme of the utility model will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0035] This application provides a fluidized bed jet mill, which is described in detail below. It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the descriptions of each embodiment have their own emphasis. For portions not detailed in one embodiment, reference can be made to the relevant descriptions of other embodiments.

[0036] To address the technical issues in conventional jet mills, such as difficulty in driving sufficient powders for collision within a short distance and time, and the potential for both coarse and fine powders to be driven for further collision and crushing, causing powders already crushed to the required fineness to be further crushed, resulting in unwanted particles, one embodiment of the present application provides a fluidized bed jet mill. This is described in detail below.

[0037] like Figures 2 to 4 As shown, a fluidized bed jet mill includes

[0038] The cylinder 1 is provided with a classification chamber, a powder feeding chamber and a crushing chamber from top to bottom. The classification chamber is connected to the fine powder channel 51 and the coarse powder channel 52. The fine powder channel 51 is connected to the exhaust system.

[0039] A powder classifier 2 is installed in the classifying chamber, and an air outlet of the powder classifier 2 is connected to the fine powder channel 51, so that the fine powder separated by the powder classifier 2 is discharged from the fine powder channel 51;

[0040] A powder feeding device is connected to the powder feeding chamber and is suitable for feeding powder into the powder feeding chamber;

[0041] At least one pair of powder nozzles 3 is installed on the barrel 1 of the pulverizing chamber. The outlets of each pair of powder nozzles 3 are arranged radially opposite to each other in the pulverizing chamber. The inlets of the powder nozzles 3 are respectively connected to the first Venturi powder pumps 31. A coarse powder return pipe is connected between the powder inlet of the first Venturi powder pump 31 and the coarse powder channel 52, so that the coarse powder separated in the grading chamber is pulverized in the pulverizing chamber.

[0042] like Figure 2 and Figure 4 As shown, the powder classifier 2 adopts an impeller classifier; the powder classifier 2 includes a motor 21 and a powder classifying impeller 22. The motor 21 is fixedly arranged outside the cylinder 1, and the powder classifying impeller 22 is located in the classifying chamber. The motor 21 drives the powder classifying impeller 22 to rotate in the classifying chamber. The powder classifying impeller 22 blocks the entrance of the fine powder channel 51. Fine powder can enter the fine powder channel through the powder classifying impeller 22, while coarse powder is blocked outside. The coarse powder is finally sucked away by the negative pressure of the coarse powder channel 52 on one side.

[0043] In this embodiment, the number of powder spray pipes 3 is one pair. If the number exceeds one pair, each pair of powder spray pipes 3 needs to be installed at different heights of the barrel 1.

[0044] Specifically, as an optional embodiment in this embodiment, as shown in Figure 2 、 Figure 3 and Figure 4 , the classification chamber and the powder inlet chamber are both cylindrical chambers. The cylindrical chamber helps the powder to rotate in the chamber, and the powder rotation can separate the coarse powder to the inner wall of the chamber, and the fine powder can be retained at the center position, facilitating the separation of coarse and fine separation.

[0045] Specifically, as an optional embodiment in this embodiment, as shown in Figure 2 、 Figure 3 and Figure 4 , the powder classifier 2 and the fine powder passage 51 are both located at the top center position of the classification chamber.

[0046] The fine powder passage 51 is opened at the top center position of the classification chamber, and the coarse powder passage 52 is opened at the top side wall position of the classification chamber.

[0047] The motor 21 of the powder classifier 2 is inserted into the classification chamber after passing through the fine powder passage, and the powder classification impeller 22 is at the center position. The powder classification impeller 22 rotates to drive the powder to rotate and separate in the classification chamber. During the rotation process, the coarse powder is thrown to the barrel wall, and the fine powder at the center is sucked into the fine powder passage 51 through the powder classification impeller 22.

[0048] Specifically, as an optional embodiment in this embodiment, as shown in Figure 2 、 Figure 3 and Figure 4 , the powder supply device includes a powder inlet pipe and a second Venturi powder pump 4. The powder inlet pipe is tangentially arranged on the barrel 1, and the second Venturi powder pump 4 sends new powder into the powder inlet chamber through the powder inlet pipe to make the new powder rotate circumferentially in the powder inlet chamber.

[0049] The powder inlet of the second Venturi powder pump 4 is provided with a hopper. The amount of new powder to be crushed is loaded in the hopper, and the new powder in the hopper is sent into the powder inlet chamber by the second Venturi powder pump 4.

[0050] As another embodiment of the powder supply device, the powder supply device can also directly use a screw type feeder. The screw type feeder can directly send new powder into the powder inlet chamber, and the new powder is first classified in the classification chamber, and then the coarse powder is sent to the crushing chamber by the first Venturi powder pump 31 to be crushed.

[0051] In this embodiment, the second Venturi powder pump 4 is preferably the second Venturi powder pump 4, because feeding powder into the powder inlet chamber by the second Venturi powder pump 4 can drive the new powder to rotate tangentially in the powder inlet chamber. The tangential rotation of the new powder in the cylinder 1 can separate the coarse powder in advance, which is more conducive to the classification of the powder in the classification chamber.

[0052] Conventional fluidized bed jet mills, such as Figure 1 As shown, the new powder is first added to the barrel 1 through the middle feed pipe, and then a pair of high-pressure nozzles at the bottom spray air, driving the powder in the barrel 1 to fluidize and collide, thereby achieving powder crushing. During the crushing process, the powder includes fine powder and coarse powder. The fine powder will become ultrafine powder after collision again, which does not meet the actual needs. The fluidized bed air flow mill of the present invention has powder nozzles 3 directly installed on both sides of the crushing chamber. The powder nozzles 3 are directly connected to the first Venturi powder pump 31. The first Venturi powder pump 31 is connected to the coarse powder channel 52 through the coarse powder return pipe, and the coarse powder in the barrel 1 is collected separately. After the coarse powder is mixed with the high-pressure airflow of the first Venturi powder pump 31, the coarse powder + high-pressure airflow is sprayed into the crushing chamber. In the past, only high-pressure air was sprayed. In the past, the high-pressure airflow was first hit into the chamber, and then the powder in the chamber was driven to collide, transmitting this powder collision. The force is relatively small, and the crushing efficiency is not high. Now the high-pressure airflow carries the coarse powder to collide directly in the crushing chamber. The high-pressure airflow output from the first Venturi powder pump 31 is at a supersonic speed, which directly causes the coarse powder to collide with the coarse powder at a supersonic speed. The crushed powder quality is very high, and the colliding powder is more targeted. In the past, the colliding powder included fine powder and coarse powder, but now the colliding powder is coarse powder collected separately, which improves the efficiency of the powder crushing. Since the coarse powder collides with the coarse powder, it is easier to control the powder particle size, which ultimately improves the powder making efficiency of the entire airflow mill.

[0053] In this embodiment, an adjustment plate is provided on the coarse powder channel 52 to control the flow rate of the coarse powder within. The adjustment plate moves radially within the coarse powder channel 52, thereby adjusting the flow rate of the coarse powder channel 52 and, in turn, controlling the amount of coarse powder entering the two first Venturi powder pumps 31. If too much coarse powder collides within the pulverizing chamber, the pulverizing quality will be affected. Therefore, it is necessary to control the coarse powder input rate of the first Venturi powder pumps 31.

[0054] One embodiment of the present application provides a flour-making method, which is described in detail below.

[0055] A powder making method, using the above-mentioned fluidized bed jet mill, such as Figures 2 to 4As shown, including: new powder is sent into the powder chamber by the powder supply device, the new powder is upwardly into the classification chamber under the action of the powder extraction system, the fine powder is discharged from the fine powder channel 51 by the powder classifier 2, the remaining coarse powder is returned to each powder injection pipe 3 through the coarse powder return pipe, so that the coarse powder is carried in the high-pressure gas flow sprayed by the powder injection pipe 3, the coarse powder is directly collided when being sprayed, so that the powder is crushed, the crushed powder is upwardly into the classification chamber again for powder classification, the fine powder meeting the requirements is extracted, and the coarse powder is returned to the powder injection pipe 3 again for collision.

[0056] Specifically, as an optional embodiment in the embodiment, the new powder enters the powder chamber through the tangentially arranged powder inlet pipe, drives the new powder to rotate circumferentially in the powder chamber, and the rotation direction of the new powder in the cylinder body 1 is opposite to the rotation direction of the impeller in the powder classifier 2. Because the rotating powder-carrying gas flow and the oppositely rotating impeller make the separation of fine powder more selective.

[0057] Each device (parts without specific structure) selected in the application is a general standard part or a part known to those skilled in the art, and the structure and principle thereof can be known by a technical manual or obtained by a conventional experimental method.

[0058] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] In the description of the present application, it should be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0060] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other manners. The described device embodiments are merely schematic, for example, the division of the units is only a logical function division, and there can be another division manner in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between the units can be indirect couplings or communication connections through some interfaces, devices or units, and can be electrical, mechanical or in other forms.

[0061] The units described as separated components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments.

[0062] In addition, each functional unit in the various embodiments of the present application can be integrated into one processing unit, or each unit can exist physically, or two or more units can be integrated into one unit.

[0063] Based on the above ideal embodiments according to the present application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical concept of the present application. The technical scope of the present application is not limited to the contents in the specification, and must be determined according to the scope of claims.

Claims

1. A fluidized bed jet mill, characterized in that: include A cylinder (1), wherein a classification chamber, a powder feeding chamber, and a crushing chamber are sequentially provided in the cylinder (1) from top to bottom, the classification chamber is connected to a fine powder channel (51) and a coarse powder channel (52), and the fine powder channel (51) is connected to an exhaust system; A powder classifier (2) is installed in a classification chamber, wherein an air outlet of the powder classifier (2) is connected to a fine powder channel (51), so that fine powder separated by the powder classifier (2) is discharged from the fine powder channel (51); A powder feeding device is connected to the powder feeding chamber and is suitable for feeding powder into the powder feeding chamber; At least one pair of powder nozzles (3) is installed on the barrel (1) of the pulverizing chamber, the outlets of each pair of powder nozzles (3) are arranged radially opposite to each other in the pulverizing chamber, the inlets of the powder nozzles (3) are respectively connected to a first Venturi powder pump (31), and a coarse powder return pipe is connected between the powder inlet of the first Venturi powder pump (31) and the coarse powder channel (52), so that the coarse powder separated in the grading chamber is pulverized in the pulverizing chamber.

2. The fluidized bed jet mill according to claim 1, wherein: The classification chamber and the powder feeding chamber are both cylindrical chambers.

3. The fluidized bed jet mill according to claim 2, wherein: The powder classifier (2) and the fine powder channel (51) are both located at the top center of the classification chamber; The fine powder channel (51) is opened at the center of the top of the classification chamber, and the coarse powder channel (52) is opened at the side wall of the top of the classification chamber.

4. The fluidized bed jet mill according to claim 2 or 3, characterized in that: The powder supply device comprises a powder feed pipe and a second Venturi powder pump (4), wherein the powder feed pipe is tangentially arranged on the barrel (1), and the second Venturi powder pump (4) feeds new powder into the powder feed chamber through the powder feed pipe, so that the new powder rotates circumferentially in the powder feed chamber.

5. The fluidized bed jet mill according to claim 1, wherein: The powder classifier (2) is an impeller classifier.

6. The fluidized bed jet mill according to claim 1, wherein: The coarse powder channel (52) is provided with an adjustment plate for controlling the flow rate of the coarse powder inside.

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