JP2954930B1 - Pulverizer - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To increase the time required for particles to pass through a pulverizing chamber to sufficiently perform a pulverizing process and to reduce the average particle size of a pulverized product, and at the same time, to make the particle size more round, To provide a fine pulverizer capable of further reducing the pressure loss. SOLUTION: A rotor supported by a rotating shaft and provided on the outer peripheral surface with concave portions and convex portions parallel to the generatrix alternately and continuously provided in the circumferential direction, and fitted with a small gap outside the rotor. The raw material sucked together with the air is finely divided by the high-speed rotation of the rotor into the space between the stator and the stator in which the concave portions and the convex portions parallel to the generatrix are alternately and continuously provided on the inner peripheral surface. In the pulverizer for pulverizing, the rotor is divided into a plurality of stages, and the outer diameter is sequentially increased from the lower stage to the upper stage, and the number of the concave portions and the convex portions is increased. Characterized in that the inner diameter is divided into a plurality of stages and the inner diameter is sequentially increased from the lower stage to the upper stage, and the number of concave portions and convex portions is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a pulverizer.

[0002]

2. Description of the Related Art Conventional pulverizers for pulverizing raw materials into fine particles of the order of microns to several tens of microns are disclosed in, for example, JP-A-59-105853 and JP-B-3-15489. Things are known. As shown in FIG. 8 , these fine pulverizers support, on a rotating shaft 33, a cylindrical rotor 32 in which a large number of concave portions 30 and convex portions 31 which are parallel to a generating line are alternately continuous in the circumferential direction on the outer peripheral surface. ,
A cylindrical stator 37 in which a large number of concave portions 35 and convex portions 36 parallel to the generatrix are alternately continuous in the circumferential direction on the inner circumferential surface of the rotor 32 with a small gap 34 and an outer circumferential surface. 32, and the gap 34 is used as a crushing chamber.

In such a pulverizer, the rotor 32 is rotated at a high speed, and the raw material supplied from the raw material supply port 40 by the operation of a suction blower (not shown) connected to the product discharge port 39 of the casing 38 together with the air flow. Minute gap 34
Of the rotor 32 and the stator 37 to effectively collide with the uneven surface due to the eddy current generated by the unevenness of the rotor 32 and the stator 37, or the both convex portions 31 of the rotor 32 and the stator 37,
After the pulverizing process is performed to form fine particles by grinding between the fine particles 36, the fine particles flowing out of the fine gaps 34 are discharged from the product discharge port 39 to the outside of the machine.

In the above-mentioned pulverizer, the recess 30 of the rotor 32
9A , 9B, 9C, and 9D are presented as combinations of the convex portion 31 and the concave portion 35 and the convex portion 36 of the stator 37. In these figures, a and b in FIG.
The concave portion 30 and the convex portion 31 of the rotor 32 shown in FIG.
The recesses 35 and the protrusions 36 of the stator 37 shown in FIG. 9C have a rectangular cross section, and the rotor 32 shown in FIGS.
9 and the stator 3 shown in FIGS.
7 have a triangular cross section.

By the way, when the raw material is pulverized by rotating the rotors 32 having the same number of concavities and convexities in rectangular and triangular shapes, the raw material having a relatively large particle size is
The size of the pulverized product becomes smaller when the rotor 32 has triangular irregularities. However, as the particle size of the raw material decreases, the particle size of the pulverized product does not change. That is, the rotor 32 having the triangular irregularities has a high crushing ability when a material having a relatively large particle size is supplied. Also, in the case of the rotor 32 having both rectangular and triangular irregularities, if the number of irregularities is increased, the particle size of the pulverized product becomes smaller. However, when the grain shape of the raw material is coarse, if the number of irregularities is too large, the grain shape of the pulverized product becomes coarse. Further, the rotor 32 having the triangular irregularities does not have a round shape of the pulverized product as compared with the rotor 32 having the rectangular irregularities, and the surface is less likely to be smooth.

[0006] For this reason, in the above-mentioned pulverizer, the rotor 32 is divided into two or more stages, and the recess 3 is formed from the lowermost stage on the raw material supply port 40 side to the uppermost stage on the product discharge port 39 side.
By increasing 0 and the number of the convex portions 31, the particle size of the pulverized product can be reduced, and the particle shape of the pulverized product is rounded.
It has been found that the surface can be smoothed.

However, the closer to the upper stage the product outlet 39 is, the smaller the cross-sectional area of the crushing chamber between the rotor 32 and the stator 37 is. However, the passage time of the particles becomes short, the pulverization process becomes insufficient, the average particle size of the pulverized product is not too small, the particle shape is not too round, and the surface is not so smooth. Further, the pressure loss increases, and the size of the suction blower increases.

[0008]

SUMMARY OF THE INVENTION Therefore, according to the present invention, the time required for particles to pass through a pulverizing chamber can be lengthened and pulverization can be sufficiently performed, and the average particle size of the pulverized product can be reduced. Another object of the present invention is to provide a fine pulverizer capable of making the particle diameter more round, making the surface smoother, and reducing the pressure loss.

[0009]

[Means for Solving the Problems] In order to solve the above-mentioned problems
The pulverizer of the present invention is supported by a rotating shaft and has a bus bar on the outer peripheral surface.
Concave and convex parallel to each other are provided alternately and continuously in the circumferential direction
Divided rotor into multiple stages and from lower to upper
Increasing the outer diameter and increasing the number of concaves and convexes
And fitted inside the rotor with a small gap
Concave and convex portions parallel to the generating line are alternately and continuously
The stator provided in the direction is divided into multiple stages and
From the bottom to the top, and increase the number of concaves and convexes.
In the space between the rotor and the stator, together with air
The sucked raw material is finely pulverized by high-speed rotation of the rotor.
In the pulverizer, the concave and convex portions of the stator have a triangular shape.
Shape or square shape, and the lowermost concave portion of the rotor
The convex part is formed in a triangular shape, and the concave part and convex part
It is characterized by having a rectangular shape.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the pulverizer of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a fine pulverizer.
Is a cup-shaped lower casing placed on the base 2,
A peripheral wall 1a of the lower casing 1 has a truncated inverted conical inner surface, and a raw material supply port 3 for supplying a raw material (not shown) to the machine together with air is provided on a lower side of the lower casing 1. Have been. At the upper end of the lower casing 1, a cylindrical stator 4 is continuously provided. The inner surface of the stator 4 is divided into a plurality of stages, in this example, three stages, and a lower stage 4 is formed.
a, the middle step 4b, the upper step 4c, the inner diameter is sequentially increased, and the concave parts 5 and the convex parts 6 are provided alternately and continuously in the circumferential direction on the inner surface of each step, and the number of the concave parts 5 and the convex parts 6 is lower. The order is increased in the order of 4a, middle stage 4b, and upper stage 4c. A cap-shaped upper casing 7 is continuously provided at the upper end of the stator 4, and a product outlet 8 is provided in a tangential direction on a peripheral wall 7 a of the upper casing 7. A suction blower (not shown) is provided at the product outlet 8. It is connected. One cylindrical rotor 9 is provided in the stator 4.
The outer surface of the rotor 9 is divided into three stages corresponding to the stator 4 and has an outer diameter of a lower stage 9a, a middle stage 9b, and an upper stage 9c in this order. Concave portions 11 and convex portions 12 are provided alternately and continuously in the circumferential direction on the outer surface of each step, and the number of concave portions 11 and convex portions 12 is increased in the order from lower stage 9a to middle stage 9b and upper stage 9c. It is. The rotor 9 is supported by bearings 13 and 14 on a rotating shaft 15 whose upper and lower ends are supported by the upper casing 7 and the base 2. Rotary shaft 15 protruding into base 2
A pulley 16 is attached to the lower end of the pulley. The pulley 16 is driven by a motor (not shown) via a belt 17. Cone-shaped protrusions 18 and 19 are provided at the upper and lower ends of the rotor 9, respectively, and the airflow (product) sent from a grinding chamber formed between the stator 4 and the rotor 9 by the protrusions 18 and 19 is provided. ) Is gradually increased, and the air passage (including the raw material) fed into the pulverizing chamber is gradually decreased. In addition, the depth of the concave portion 5 of the stator 4 and the concave portion 11 of the rotor 9 is about 1 to 5 mm.

[0011] In the above pulverizer, each stage 4 of the stator 4
The concave portions 5 and the convex portions 6 of a, 4b, and 4c are, as shown in FIG.
A triangular shape or a square shape as shown in FIG. 3 is preferable.
, The recesses 5 of the respective stages 4a, 4b, 4c of the stator 4
The protrusion 6 is formed in a triangular shape as shown in FIG.
Recess 11 and projection 12 of lower stage 9a of rotor 9 corresponding to
Is formed in a triangular shape as shown in FIG.
The concave portion 11 and the convex portion of the upper stage 9c The part 12 has a square shape.
You.

In the fine pulverizer of the embodiment having the above-described configuration, when the raw material is sucked together with the air from the raw material supply port 3 by the operation of the suction blower connected to the product discharge port 8 shown in FIG. It is guided to the protrusion 19 at the lower end of the rotor 9 and is uniformly sent into the pulverizing chamber between the stator 4 and the rotor 9 without disturbing the air flow. As a result, a very narrow (sharp) product having a narrow particle size distribution in the order of microns is sent out into the casing 7 together with the air, and is guided by the protrusion 18 at the upper end of the rotor 9 to ascend and rise. , And is discharged out of the apparatus through the product discharge port 8 and introduced into a bag filter (not shown), where the product and air are separated, and the air is discharged to the atmosphere via a suction blower. Is the product is stored is transmitted from the bag filter into the hopper.

[0013] Thus, grinding of the raw material in the grinding chamber is performed as follows. The air flow (including the raw material) sent into the crushing chamber spirally rises in the minute gap 10 due to the suction by the suction blower and the high-speed rotation of the rotor 9, and the air flowing through the minute gap 10 The streamline A is stabilized as shown in FIG. 5 by the triangular projections 6 of the lower stage 4a of the stator 4 and the triangular projections 12 of the lower stage 9a of the rotor 9, and each of the lower stages 4a of the stator 4 Vortices B, B, and B are formed in the triangular recess 5 and the triangular recess 11 in the lower section 9a of the rotor 9.
C is constantly generated. Here, the raw material contained in the air flowing through the minute gap 10 is pulverized by mutual grinding in the process of flowing along the stream line A, and the lower stage 4a of the stator 4 is formed.
Are entangled in the vortices B and B 'in the triangular concave portion 5 and crushed by colliding with the wall surface of the concave portion 5, while the lower stage 9 of the rotor 9 is
a into the vortex C in the triangular recess 11 and the recess 1
1 and crushed. On the other hand, each recess 5, 11
The particles that have come out of the micro gap 10 collide with the particles flowing on the streamline A and the triangular protrusions 12 of the lower stage 9 a of the rotor 9 and are pulverized.

The material having a relatively large particle diameter is effectively pulverized by the pulverizing action in the lower part of the pulverizing chamber, and the particle diameter gradually decreases. The particles having the reduced particle size rise to the middle and high portions of the grinding chamber, and as shown in FIG. 6 , the triangular concave and convex portions 5 and the convex portions 6 and the rotor 9 in which the number of the middle stages 4b of the stator 4 is increased . The rectangular recesses 11 and protrusions 12 having a larger number of middle stages 9b are subjected to the same pulverizing action as described above to further reduce the particle size and to reduce the rotor 9 in the square recesses 11 of the middle stage 9b. The coarse particle shape repeatedly collides with the wall surface in the rectangular concave portion 11 to be rounded and the surface becomes smooth.

As a result of the pulverizing action at the middle and high portions of the pulverizing chamber, the particles having a smaller particle size and having a rounded particle shape rise to the upper part of the pulverizing chamber, and as shown in FIG. The triangular concave portion 5 and the convex portion 6 having a larger number of 4c and the rectangular concave portion 11 and the convex portion 12 having a larger number of the upper stage 9c of the rotor 9 are similar to the pulverizing action in the middle and high portions. Due to the pulverizing action of the particles, the particle diameter becomes extremely fine, the particle shape becomes more round, and the surface becomes more round. The pulverized product that has exited the pulverizing chamber has a very narrow particle size distribution width on the order of microns, a remarkably small average particle size, and uniform particles.

Further , in the pulverizer of the above embodiment, the number of the concave portions 11 and the number of the convex portions 12 of the rotor 9 are set to the lower stage 9a, the middle stage 9b,
The number of the concave portions 5 and the number of the convex portions 6 of the stator 4 are sequentially increased in the order of the lower stage 4a, the middle stage 4b, and the upper stage 4c, but the outer diameter of the rotor 9 is increased in the lower stage 9a. Middle 9
b, and the upper stage 9c are sequentially increased.
Are increased to a lower stage 4a, a middle stage 4b, and an upper stage 4c,
Since the minute gap 10 between the stator 4 and the rotor 9 at each stage is constant, the cross-sectional area of the grinding chamber does not decrease, and the flow velocity in the grinding chamber can be substantially constant or slightly reduced. The passage time of the particles is almost constant in each part, or becomes longer in the middle and high parts and the upper part of the pulverizing chamber having a large diameter, and the pulverizing treatment is sufficiently performed. Particles are obtained. Moreover, since the cross-sectional area of the pulverizing chamber does not decrease, the pressure loss of the air flow is small, and there is no need to increase the size of the suction blower. Further, if the particles become finer, it becomes difficult to grind unless the peripheral speed of the rotor 9 is increased, but since the outer diameter of the rotor 9 on the outlet side of the grinding chamber is increased, the peripheral speed of the rotor 9 increases, It is effective for further pulverizing the fine particles.

[0017]

As can be seen from the above description, in the pulverizer of the present invention, the rotor is divided into a plurality of stages, and the outer diameter is gradually increased from the lower stage to the upper stage. The number is increased, the stator is divided into a plurality of stages corresponding to the rotor, the inner diameter is sequentially increased from the lower stage to the upper stage, and the number of concave portions and convex portions on the inner peripheral surface is increased. ,
The raw material sucked with air into the grinding chamber between the rotor and the stator gradually decreases in particle size as the grinding progresses, and the pulverized product exiting the grinding chamber has a very fine particle size distribution width on the order of microns. And the average particle size is extremely small.
In particular, when the lower concave part and convex part of the rotor are triangular and the upper concave part and convex part are square, the particles whose particle diameter has been reduced by the initial pulverizing action, The grain shape becomes rounder and the surface becomes smoother. Also, even if the number of unevenness of the rotor and the unevenness of the stator are increased in the upper stage, the outer diameter of the rotor and the inner diameter of the stator are increased in the upper stage so that the minute gap between the rotor and the stator is almost constant. Since the cross-sectional area of the crushing chamber does not decrease, the flow velocity in the crushing chamber can be almost constant or slightly reduced, and the passage time of the particles is almost constant in each part, or as in the upper part of the crushing chamber. It becomes longer and the pulverization process is performed sufficiently. Moreover, since the pressure loss of the airflow is small, it is not necessary to increase the size of the suction blower. Further, since the outer diameter of the rotor on the outlet side of the pulverizing chamber is large, the peripheral speed of the rotor is increased, which is effective for further pulverizing the fine particles.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a pulverizer of the present invention.

FIG. 2 The inner peripheral surface shape of the stator in the pulverizer of FIG.
It is a downward longitudinal perspective view which shows an example.

FIG. 3 The inner peripheral surface shape of the stator in the pulverizer of FIG.
It is a downward longitudinal perspective view which shows another example.

FIG. 4 The outer peripheral surface shape of the rotor in the pulverizer of FIG.
It is an upward perspective view which shows a specific example.

FIG. 5 Specific lower stage of the stator in the pulverizer of FIG.
Showing the grinding action in the grinding chamber between the rotor and the lower stage of the rotor
FIG.

FIG. 6 Middle stage of the specific stator in the pulverizer of Fig. 1
Showing the grinding action in the grinding chamber between the rotor and the middle stage of the rotor
FIG.

FIG. 7 Specific upper stage of the stator in the pulverizer of FIG.
Showing the crushing action in the crushing chamber between the rotor and the upper stage of the rotor
FIG.

FIG. 8 is a longitudinal sectional view showing a conventional pulverizer.

FIG. 9 a, b, c, d are rotations in a conventional pulverizer
An example of the combination of the uneven portion of the stator and the uneven portion of the stator is shown.
FIG.

[Explanation of symbols]

 Reference Signs List 4 Stator 4a Stator lower stage 4b Stator middle stage 4c Stator upper stage 5 Stator recess 6 Stator protrusion 9 Rotor 9a Rotor lower stage 9b Rotor middle 9c Rotor upper stage 10 Micro gap 11 Recessed part of rotor 12 Convex part of rotor 15 Rotation axis

Claims (1)

(57) [Claims] 1. An outer peripheral surface which is supported by a rotating shaft and which is flat with respect to a generatrix.
A circuit in which concave and convex portions are alternately and continuously provided in the circumferential direction.
The trochanter is divided into multiple stages and the order is from bottom to top.
Next, increase the outer diameter and increase the number of concaves and convexes.
Fitted with a small gap on the outside of the trochanter
On the other hand, parallel concave and convex portions are alternately provided in the circumferential direction.
The stator is divided into multiple stages and
To sequentially increase the inner diameter and increase the number of concave portions and convex portions,
The space between the rotor and the stator was sucked together with air.
Fine crushing of raw materials by high speed rotation of the rotor
Machine, the concave and convex portions of the stator have a triangular or rectangular shape.
And the lowermost concave and convex portions of the rotor are triangular.
The upper concave and convex portions are rectangular.
Pulverizer characterized by being made.