JPS63104659A - Pulverizer - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pulverizer that pulverizes a material to be pulverized into fine particles ranging from the order of microns to more than 10 microns.

[Prior Art] Conventionally, as the above-mentioned pulverizer, for example, JP-A-59-10
The one published in Publication No. 5853 is known. As shown in FIG. 5, this pulverizer consists of a cylindrical stator 2 having a number of convex blades 1 continuous in the circumferential direction on the inner peripheral surface parallel to the generatrix.
A cup-shaped (or cap-shaped) supply housing 4 having a supply port 3 for the material to be crushed (not shown) and a discharge port 5 for products such as toner or ceramic fine powder (not shown) are provided at both ends of the housing. A cylindrical rotating body, in which a cap-shaped (or cup-shaped) discharge housing 6 is connected in series, and a number of convex blade portions 8 parallel to the generatrix are continuous in the circumferential direction on the outer circumferential surface, supported by a rotating shaft 7. The child 9 is placed inside the stator 2 with a minute gap (for example, 1
711111 and below) and are inserted into each other.

In the pulverizer configured as described above, the material to be pulverized is sucked into the supply housing 4 from the supply port 3 along with air by operating a rotor-driving electric motor and a suction blower (both not shown) connected to the discharge port 5. The supply housing 4 is heated by the airflow generated by the stirring blades 10 fixed to the lower surface of the bottom wall of the rotor 9.
The powder is raised along the inner circumferential surface of the powder and sent into the grinding chamber formed between the stator 2 and the rotor 9, and the rotor 9, which rotates at high speed, imparts kinetic energy to cause the powder to collide with the stator 2. It is pulverized and crushed by impact with the blade part 8 of the rotor 9, and further crushed between the blade part of the stator 2 and the blade part 8 of the rotor 9 to make it even finer. The air is sent into the discharge housing 6 along the upward spiral airflow generated by the high speed rotation of the rotor 9, and is sent along the inner circumferential surface of the discharge housing 6 by centrifugal blades 11 fixed to the upper surface of the earthen wall of the rotor 9. The product and air are separated here, and the air is exhausted to the atmosphere through the suction vent, and the product is is sent from the bag filter to a hopper (not shown) and stored there.

In FIG. 5, 12 is a bearing that supports the end of the rotating shaft 7, and 13 is a pulley attached to the lower end of the rotating shaft 7, which is interlocked with the pulley of the electric motor for driving the rotating shaft via a belt 14. .

[Problems to be Solved by the Invention] However, according to the above-mentioned conventional pulverizer, since the supply port 3 of the material to be crushed is opened at the outer circumference of the bottom wall of the supply housing 4, Coupled with the fact that the airflow (including the material to be crushed) sucked into the interior of the rotor 4 is stirred by the stirring blades 10, the airflow sent into the crushing chamber between the stator 2 and the rotor 9 is affected by pulsations, etc. There is a problem in that turbulence occurs, and the concentration of the material to be crushed in the crushing chamber becomes non-uniform, resulting in variations in the crushing action. In addition, since the product discharge port 5 opens directly into the peripheral wall of the discharge housing 6, the airflow sent into the discharge housing 6 flows through the centrifugal blades 11.
This combined with the fact that the air is pressed against the peripheral wall of the exhaust housing 6 by the exhaust housing 6 causes turbulence such as pulsation in the airflow discharged from the exhaust housing 6 to the outside of the machine, causing a problem of uneven grinding action within the grinding chamber, which in turn leads to the problem that the product This causes fluctuations in the particle size distribution, such as an increase in the size of the particles.

Therefore, the present invention aims to provide a pulverizer that can prevent the occurrence of air flow turbulence at the inlet and outlet, thereby preventing variations in the pulverizing action, and thereby improving the particle size distribution of the product.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a cylindrical stator having a plurality of convex blades parallel to the generatrix on its inner peripheral surface. A cylindrical rotating device in which a cup-shaped supply housing having a mouth and a cup-shaped discharge housing having a discharge port are arranged in series, and which is supported by a rotating shaft and has a number of convex blades parallel to the generatrix on its outer peripheral surface. In the pulverizer, the feed port of the feed housing is formed by a tangential feed portion and a spiral guide portion, and the feed port of the feed housing is formed by a tangential feed portion and a spiral guide portion; The discharge port is formed by a spiral guide part and a tangential discharge part.

[Function] According to the above means, the airflow sucked from the supply part of the supply port is guided in a spiral shape by the guide part without abruptly changing its course, and then is guided along the inner circumferential surface of the supply housing. It is fed into the crushing chamber uniformly from the entire circumference while rotating, and
The airflow sent out from the grinding chamber is guided in a spiral by the guide section of the discharge port without abruptly changing its course, and then is discharged outside the machine through the discharge section, and the turbulence of the airflow before and after the grinding chamber is eliminated. do not have.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 to 4.

In the figure, 21 is a cup-shaped (or cap-shaped) supply housing placed on a base 22, and the peripheral wall 21a of this supply housing 21 has a funnel-shaped inner peripheral surface.
At the bottom of the supply housing 21, there is a material to be crushed (not shown).
A supply port 23 is provided for supplying the air and air into a separate chamber. The supply port 23 includes a supply portion 23a extending tangentially to the bottom outer periphery of the supply housing 21, and a supply portion 23a extending tangentially to the bottom outer periphery of the supply housing 21.
It consists of a spiral guide part 23b that continues to the base of a.

A cylindrical stator 2 is provided at the open end of the supply housing 21.
4 is N-crotched. On the inner circumferential surface of the stator 24, a large number of convex blade portions 24a parallel to the generatrix are provided continuously in the circumferential direction. A cap-shaped (or cup-shaped) discharge housing 25 is connected to the upper end of the stator 24, and a product (not shown) is attached to the discharge housing 25.
A discharge port 26 is provided for discharging the water and air to the outside of the machine. The discharge port 26 consists of a spiral guide part 26a whose minimum diameter is the inner diameter of the stator 24, and a tangential discharge part 26b connected to the maximum diameter of the guide part 26a. A suction blower (not shown) is connected to the unit.

A cylindrical rotor 28 supported by a rotating shaft 27 is fitted concentrically into the stator 24 with a small gap (for example, 1711111 mm or less) therebetween. On the outer peripheral surface of the rotor 28, a large number of convex blades 28a parallel to the generatrix are provided continuously in the circumferential direction, and on both end walls of the rotor 28, cone-shaped protrusions are provided. 28b and 28c are provided, respectively. On the other hand, the rotating shaft 27 has bearings 29 at both ends.
a, 29b via the discharge housing 25. A pulley 30 is attached to an end of a rotating shaft 27 that is supported by the base 22 and protrudes into the base 22.

This pulley 30 is interlocked with a rotor driving electric motor (not shown) via a belt 31.

In addition, in FIGS. 1 and 2, 32 is the supply housing 2.
1 is a hole for inspection and maintenance, which is closed by a stopper 33.

In the pulverizer having the above configuration, when the rotor driving electric motor and the suction blower are operated, the material to be pulverized, together with the air, is moved from the supply part 23a of the supply port 23 to the guide part 23b in a spiral shape without being abruptly changed in its course. After being guided by It is given kinetic energy by the child 28 and collides with the stator 24 and is crushed,
The blades 28a of the rotor 28 impact and crush the rotor 28, and the blades 24a of the stator 24 and the blades 28a of the rotor 28 grind the blades 24a and 28a to further finely crush the stator 24.
While being ground by riding on the swirl generated between the blade parts 24a, the particles are sent into the discharge housing on the spiral airflow from the upper surface, and the guide part 26a of the discharge port 26 prevents the course from being changed abruptly and turns into a spiral shape. After being guided, the product is discharged outside the machine from the discharge part 26b and introduced into a bag filter (not shown), where the product and air are separated, and the air is exhausted to the atmosphere through a suction blower. The product is sent from the bag filter to a hopper (not shown) and stored there.

[Effects of the Invention] As described above, according to the present invention, the airflow sucked from the supply part of the supply port is guided in a spiral shape by the guide part without abruptly changing its course, and then flows around the inner periphery of the supply housing. The airflow is uniformly sent into the grinding chamber from the entire circumference while swirling along the surface, and the airflow sent out from the grinding chamber is guided in a spiral shape by the guide part of the discharge port without abruptly changing its course. , since it is discharged outside the machine from the tangential discharge section,
Disturbances in the airflow such as pulsations before and after the grinding chamber do not occur as in the conventional case. Therefore, the crushing action within the crushing chamber is uniformly performed, and the particle size distribution of the product can be narrowed.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a pulverization chamber showing an embodiment of the present invention;
Figures 2, 3 and 4 are I in Figure 1, respectively.
A sectional view taken along the lines I-II, MM, and IV-IV, and FIG. 5 are longitudinal sectional views of a conventional pulverizer. 21... Supply housing 23... Supply port 23a
... Supply section 23b... Guide section 24...
Stator 24a... Blade section 25... Discharge housing 26... Discharge port 26a... Guide section
26b...Discharge part 27...Rotating shaft
28...Rotor 28a...Blade Applicant Kawasaki Heavy Industries, Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A cup-shaped supply housing having a supply port and a cup-shaped discharge housing having a discharge port are connected to the end of a cylindrical stator having a large number of convex blades parallel to the generatrix line on the inner peripheral surface. In a pulverizer, a cylindrical rotor supported by a rotating shaft and having a number of convex blades parallel to the generatrix on its outer peripheral surface is inserted into the stator with a small gap. , the supply opening of the supply housing is formed by a tangential supply part and a spiral guide part, and the discharge opening of the discharge housing is formed by a spiral guide part and a tangential discharge part. A fine grinder characterized by being formed by grinding.