JPH0222060Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention can be applied to coal pulverizing equipment for cement firing, cement raw material pulverizing equipment, cement clinker pulverizing equipment, etc. This relates to a classifier that can classify powder into three types of powder with different fineness.

(Prior art) The classifier shown in Figures 7 and 8 is a conventional classifier that classifies the powder introduced together with the conveying air into two types of powder with different fineness: coarse powder and fine powder. This is an example. In the figure, an external inverted conical body 41 having an opening for a gas inlet 42 at the bottom, a cylinder 43 connected to the top thereof, and a gas outlet 45 centered on the upper end surface of the cylinder 43.
The outer inverted cone 4 is covered with a ceiling plate 44 having a
1 is provided with an internal inverted conical body 46 connected to a chute 47 at the bottom for guiding the separated powder to the outside of the machine, and a gas passage having a cylindrical gap is formed between the upper end of the conical body 46 and the ceiling plate 44, Guide vanes 48 are arranged around the entire circumference of the gas passage.

Then, the powder is introduced together with conveying air from the gas inlet 42 at the bottom of the classifier, and the inside and outside inverted cones 4 are
After rising through the passage between 1 and 46, the powder particles are passed between the guide vanes 48 from the outside to the inside, and at this time, the guide vanes 48 create a swirling flow, and due to the action of centrifugal force and gravity on the powder particles, the mass is reduced. Large particles are separated from the airflow by the inner wall surface of the internal inverted cone 46, fall down the same wall surface, and are taken out of the machine through the chute 47, while the remaining fine powder is sent to the gas outlet 45 along with the air.
It is discharged to the outside of the machine, collected by a dust collector 31, and taken out from a fine powder outlet 32.

However, although the conventional classifier can classify the introduced powder into two types of powder with different fineness, it cannot classify it into three types of powder.

(Problems to be Solved by the Invention) The purpose of the present invention is to obtain a classifier that can introduce powder conveyed by air and classify it into three types of powder with different fineness, unlike the above-mentioned conventional methods. It is something.

(Means for Solving the Problems) In order to achieve this objective, the present invention has a two-stage classification mechanism, upper and lower. Between a cylinder connected to the upper end of the inverted cone, an external body consisting of a ceiling plate that covers the upper end surface of the cylinder and has a concentric gas outlet opening, and the inner surface of the external inverted cone and the lower surface of the ceiling plate. an inner inverted cone supported from the outer body at a distance from the outer body and having at its bottom an opening for discharge of separated powder or connecting a separated powder outlet chute extending outboard from the opening; In order to give a swirl to the airflow flowing from the outside to the inside of the cylindrical gap formed between the upper end of the internal inverted cone and the ceiling plate, the airflow is arranged around the entire circumference of the cylindrical gap and mutually The apparatus is provided with guide vanes having different angles, and the vicinity of the bottom opening of the external inverted cone of the upper classification mechanism is connected to the opening of the ceiling plate of the lower classification mechanism.

(Function) Now, in the above configuration, the powder to be classified is introduced from the lower classification mechanism together with the conveying air, ascends between the inner and outer inverted cones, and then passes between the guide vanes from the outside toward the inside. At the same time, a swirling flow is generated by the guide vanes, and large particles are separated by inertia against the wall of the internal inverted cone due to the action of centrifugal force and gravity, and descend to the separated powder outlet chute. Coarse and fine powder is taken out of the machine as classified powder No. 1.

The remaining powder rises from the gas inlet of the upper classification mechanism between the inner and outer inverted cones, and then passes between the guide vanes from the outside to the inside, and at the same time, the guide vanes generate a swirling flow to remove the powder. Due to the action of centrifugal force and gravity on the particles of the body, large particles are separated by inertia on the inner wall surface of the inner inverted cone, and descend to the intermediate fine powder as a second classified powder from the separated powder outlet chute. powder is taken out of the machine.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. Figures 1 to 3 show the first embodiment of the present invention. For air classification into three different types of powder,
It is characterized by performing two-stage classification, and the classifier is composed of a lower classification mechanism and an upper classification mechanism.

First, the lower classification mechanism has an external inverted conical body 11 to which a gas inlet pipe 12 for introducing powder together with conveying air is connected to the bottom thereof, a cylinder 13 at the top thereof, and a ceiling opening 15 that covers the upper end surface of the cylinder and is concentric with the external inverted conical body 11. The outer main body of the lower classification mechanism is constituted by the ceiling plate 14 having a
and the ceiling plate 14, and is supported from the external body with a space therebetween, and has a separated powder outlet chute 1 at the bottom.
7, and guide vanes 18 are provided around the entire circumference of the gas passage in the cylindrical gap formed between the upper end of the internal inverted cone 16 and the ceiling plate 14.
is located.

Next, the upper classification mechanism includes an external inverted conical body 21 having a gas inlet 22 at the bottom, and a cylinder 23 at the top thereof.
The external main body is composed of a ceiling plate 24 that covers the upper end surface of the cylinder 23 and has a gas outlet 25 at the center, and the vicinity of the bottom opening of the external inverted cone 21 is concentric with the ceiling plate opening 15 of the lower classification mechanism. join to. Further, inside the external body, there is an internal inverted cone which is supported from the external body with a space between the inner surface of the external inverted cone 21 and the lower surface of the ceiling plate 24, and which connects the separated powder outlet chute 27 to the bottom. A cone body 26 is provided,
The guide vane 28 has a structure in which a guide vane 28 having a different angle from the guide vane 18 is arranged around the entire circumference of the gas passage in the cylindrical gap formed between the upper end of the internal inverted conical body 26 and the ceiling plate 24. There is.

To explain the operation of the first embodiment configured as above, the powder to be classified is introduced upward from the gas inlet pipe 12 at the bottom of the lower classification mechanism together with the conveying air, and the inverted conical bodies 16 and 11 inside and outside After rising between the powder particles, the powder particles are caused to pass between the guide vanes 18 from the outside to the inside, and at the same time, a swirling flow is generated by the guide vanes 18, and large particles are internally reversed due to the action of centrifugal force and gravity. The powder is separated on the wall of the cone 16, descends, and is taken out of the machine from a separated powder outlet chute 17 as a first classified powder.

The remaining powder rises from the gas inlet 22 of the upper classification mechanism between the inner and outer inverted cones 26 and 21, and then passes between the guide vanes 28 from the outside to the inside. generates a swirling flow,
The centrifugal force on powder particles is reduced by the action of gravity.
Large particles are separated by inertia on the inner wall surface of the internal inverted cone 26, and descend to take out intermediate fineness powder as second classified powder from the separated powder outlet chute 27. Ru. The remaining powder is discharged from the gas outlet 25 together with the conveying air, guided to a dust collector 31 and collected, and fine powder is taken out from the refined powder outlet 32 as third classified powder.

Next, FIGS. 4 to 6 show a second embodiment of the present invention, which differs from the first embodiment in the powder introduction structure in the lower classification mechanism section and the discharge of the first classified powder. This is only a structural part, and other parts are the same, so the main differences will be described below.

Now, the external main body of the lower classification mechanism consists of an external inverted cone 11 having a chute 20 at the bottom for discharging the first separated powder, a cylinder 13 connected to the top of the external inverted cone, and a conical It is composed of a ceiling plate 14 having an opening 15 and a gas inlet 30 provided on the side surface of the upper end of the external body. Furthermore, the bottom opening 19 of the inner inverted cone 16 opens into the interior of the outer inverted cone 11 .

Next, to explain the operation of this second embodiment, the powder to be classified is transported to the gas inlet 3 along with the conveying air.
0, passing between the guide vanes 18 from the outside to the inside, and at the same time creating a swirling flow by the guide vanes, large particles are separated and transferred from the bottom opening 19 of the inner inverted cone 16 to the outer inverted cone. The powder is discharged into the interior of the body 11 and further led out of the machine via a separating powder outlet chute 20 connected to the external inverted cone body 11 .
Further, the coarse powder separated before reaching the guide vane 18 descends on the inner surface of the external inverted cone 11 and is taken out from the separated powder outlet chute 20.

(Effect of the invention) Since the present invention is configured as described above, it is possible to classify three types of powders with different fineness by inertia through two-stage classification and separation using the lower and upper classification mechanisms. can. In addition, the fineness of the first, second, and third classified powders is related to the diameter and swirling flow velocity of the guide vanes of the lower and upper classification mechanisms, as well as the separation performance due to the specific gravity and particle size distribution of the powder particles. The fineness of the separated powder can be adjusted by adjusting the angle of the guide vanes, and the first classified powder is classified by the guide vanes of the lower classification mechanism, and the second and third classified powders are further classified by the upper classification mechanism. Adjusted by guide vanes of the mechanism.

[Brief explanation of drawings]

Fig. 1 is a front cross-sectional view of a classifier showing the first embodiment of the present invention, Fig. 2 is a - cross-sectional view of Fig. 1;
The figures are a cross-sectional view of FIG. 1, FIG. 4 is a front cross-sectional view of a classifier showing a second embodiment of the present invention, FIG. 5 is a cross-sectional view of FIG. - Cross-sectional view, Figure 7 is a front cross-sectional view of a conventional classifier, Figure 8
The figure is a - sectional view of FIG. Explanation of the main parts of the figure, 11... External inverted cone,
12... Gas inlet pipe, 13... Cylinder, 14... Ceiling plate, 15... Concentric opening, 16... Internal inverted cone, 17... Separated powder outlet chute, 18... Guide vane, 21... ... External inverted cone, 22 ... Gas inlet, 23 ... Upper cylinder, 24 ... Ceiling plate, 25
... Gas outlet, 26 ... Internal inverted cone, 27 ...
Separated powder outlet chute, 28...guide vane.

Claims (1)

[Scope of utility model registration request] It has a two-stage classification mechanism, upper and lower, and each classification mechanism has an external inverted cone with an opening at the bottom, a cylinder connected to the upper end of the external inverted cone, and a cylinder that covers the upper end surface of the cylinder and is concentric with the outer inverted cone. an outer body consisting of a ceiling plate having a gas outlet opening of 1,000,000 yen, and an inner surface of the outer inverted cone and a lower surface of the ceiling plate supported from the outer body with a space therebetween; an internal inverted cone having a discharge opening or connecting a separated powder outlet chute extending outside the machine from the opening; and a cylindrical gap formed between the upper end of the internal inverted cone and the ceiling plate. The outer inverted cone of the upper classification mechanism is provided with guide vanes arranged around the entire periphery of the cylindrical gap and at different angles to give swirl to the airflow flowing from the outside to the inside. A classifier characterized in that the vicinity of the bottom opening is connected to the opening in the ceiling plate of the lower classification mechanism.