JPH05161861A - Cyclone dust collector - Google Patents

Abstract

PURPOSE:To provide a stable classifying point in order to improve classifying accuracy by a method wherein a fine particle outlet to be inserted axially into a classifying chamber is made up of a diverting gas exhaust structure and a uniform flow rate is assured in the cross-sectional direction of pipe. CONSTITUTION:A classifying chamber 4 is provided with a cylindrical part 1 at the upper end of its cone part 2, a coarse particle outlet opening 3 at the lower end thereof and a reversal board 5 therein. A fine particle outlet opening 12 having a diverting gas exhaust structure 8 is formed in a manner that an inner cylinder 11 is inserted coaxially into an outer cylinder 10 provided around an axis CL running through the center of the cylindrical part 1 to the upper wall thereof and the distance between the inner cylinder 11 and the reversal board 5 is made shorter than the distance between the outer cylinder 10 and the reversal board 5. A dust containing fluid inlet opening 17 is formed and provided with six flow diverting blades 16 extending tangentially from one side of a cylindrical diverting chamber 14 formed coaxially with a dust containing fluid inlet pipe 15 and located outside the outer cylinder 10 and sloping spirally at the lower end of the cylindrical diverting chamber 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cyclone type dust collector used for dust collection and excellent in classification accuracy.

[0002]

2. Description of the Related Art Conventionally, a cyclone type dust collector as shown in FIG. 3 has been used. That is, a gas containing solid particles is introduced at a high speed in a tangential direction from a dust-containing fluid inflow pipe 52 projecting from a cylindrical portion 51 continuous to the upper end of the cone portion 50, and a swirl that occurs inside due to the inflow. Due to the action of centrifugal force, particles having a large particle size and a large specific gravity are settled toward the outer wall by the air flow, descend to the cone portion 50 along the vessel wall, and are discharged from the discharge port at the lower end of the cone portion 50. On the other hand, the cylindrical portion 5 from which particles having a large diameter or a large specific gravity have been removed
1 The gas located at the center is sucked by the negative pressure of the exhaust pipe 54 introduced from the upper wall 53 to the axial center position.

Then, generally, the classified particle size δ [cm] by this kind of centrifugation is determined by the calculation formula shown in Formula 1. Here, the circumferential flow velocity vθ [cm / s] is the supply / transport velocity from the dust-containing fluid introduction pipe 52.

[0004]

[Formula 1]

[0005]

However, as can be seen from the above equation 1, the classification particle diameter δ [cm] is influenced by the suction speed v [cm / s] from the exhaust pipe 54, that is, the flow velocity in the outlet pipe diameter cross section. However, in the conventional device of this type, since the flow velocity distribution in the cross-sectional direction of the exhaust pipe 54 is not constant, the classified particle diameter δ [cm] has a large variation, and there is a problem in the classification accuracy. ..

The present invention has been made in view of the above problems, and an object of the present invention is to provide a cyclone-type dust collecting device having a novel structure used for a classifying device or a classification dust collecting device having excellent classification accuracy. Is.

[0007]

A cyclone type dust collecting apparatus according to the present invention constitutes a classification chamber in which a cylindrical portion is connected to an upper end of an inverted conical cone portion and a coarse particle discharge port is opened at a lower end thereof. In addition, in the cyclone type dust collector in which a frustoconical reversal plate is installed in the classification chamber, and a dust-containing fluid inflow pipe and a fine particle discharge port are provided in the classification chamber, the fine particle discharge port is provided on the upper wall of the cylindrical portion. A shunt exhaust structure in which an inner cylinder is concentrically inserted with respect to an outer cylinder provided at the axial center, and the distance between the two cylinders extending to the classification chamber 4 from the reversal plate is longer than the inner cylinder. And
The dust-containing fluid inflow pipe is located outside the outer cylinder and protrudes in a tangential direction from one side of a cylindrical flow dividing chamber formed concentrically, and is located at the lower end of the cylindrical flow dividing chamber. The gist of the present invention is that the dust-containing fluid inlet is formed by projecting a plurality of flow dividing blades that are spirally inclined inward from the inner wall of the.

Further, in the split flow exhaust structure, an inner cylinder having a diameter of about 0.7d is concentrically inserted into an outer cylinder having a diameter d, and the distances of both cylinders extending to the classification chamber from the reversing plate are: It is preferable that the inner cylinder is configured to be approximately 1/2 L with respect to the outer cylinder L.

[0009]

In the above structure, the fine particle discharge side structure inserted from the upper wall at the axial center position of the classification chamber is a split flow exhaust structure in which the cross-sectional areas of the outer cylinder and the inner cylinder are divided into two, and the structure is uniform in the pipe cross-sectional direction. A flow rate can be secured. Therefore, the suction speed v of the previous equation 1
[Cm / s] becomes constant, and the classified particle diameter δ [cm] can be made constant.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cyclone type dust collecting apparatus according to the present invention will be described below with reference to FIGS.

Reference numeral 1 is a cylindrical portion which is continuous with the upper end of an inverted conical cone portion 2, and the coarse grain discharge port 3 is provided at the lower end of the cone portion 2.
And the lower end axis C of the cylindrical portion 1 in the classification chamber 4
A truncated cone-shaped reversing plate 5 having a disk surface 6 at the top is located at L.

The upper wall 7 of the cylindrical portion 1 has an axial center CL
A split flow exhaust structure 8 and a vortex flow inflow structure 9 are formed at the position. The split exhaust structure 8 has an outer cylinder 10 having a diameter of d.
The inner cylinder 11 of 7d is concentrically inserted, and the distance of both cylinders 10 and 11 extending into the classification chamber 4 from the disk surface 6 of the reversing plate 5 is L in comparison with the outer cylinder 10. The inner cylinder 11 is 1 /
It is configured to be 2L. And both cylinders 10, 1
1 communicates with a suction device (not shown) as a fine particle discharge port 12.

The vortex flow inflow structure 9 projects a dust-containing fluid inflow pipe 15 in a tangential direction from one side of a cylindrical flow dividing chamber 14 which is located outside the outer cylinder 10 by a flow dividing cylinder 13 and is concentrically formed. In addition, a plurality (six in the embodiment) of the flow dividing blades 16, 16 which are located at the lower end of the cylindrical flow dividing chamber 14 and are spirally inclined (vortex flow direction A) from the inner wall of the flow dividing cylinder 13 toward the inner diameter direction. The dust-containing fluid inflow port 17 is formed by protruding. Then, the gas containing the particles to be classified is supplied from the dust-containing fluid inflow pipe 15 at a predetermined transport speed (12 to 20 m / s).

The cyclone type dust collector having the above structure is
By supplying the gas containing the particles to be classified from the dust-containing fluid introducing pipe 15, the coarse particles are separated and recovered from the coarse particle outlet 3, and the gas containing the fine particles is separated and recovered from the fine particle outlet 12. Fine particle outlet 1 by changing the separation point
It is possible to use a dust collecting device that collects only gas from 2.

According to the above construction, the dust-containing fluid flowing from the dust-containing fluid introduction pipe 15 into the cylindrical flow dividing chamber 14 becomes a vortex in the direction of arrow A by the flow dividing blades 16, 16 ... It spouts toward 4, and gradually begins to settle (settling direction F1). However, in the classification chamber 4, the split exhaust structure 8 forms the tubular exhaust passages of the outer cylinder 10 and the inner cylinder 11 and the pipe passage of the inner cylinder 11, and since the cross-sectional area is divided into two, both flows are separated. Due to the uniform parallel gas flow velocity (flow velocity direction F2) sucked from the passage, a uniform centripetal force toward the center CL acts, and the particles contained in the gas are the centrifugal force F3 generated by the vortex and the difference between the centripetal force F2. , Fall in the resultant direction F of the sinking force F1.

Particles that fall from the gap between the reversing plate 5 and the cylindrical portion 1 toward the rough flow discharge port 3 by this drop, and particles that fall into the disc surface 6 of the reversing plate 5 from the outer cylinder 10 or the inner cylinder 11 The particles are classified into particles that are sucked and discharged together with the particles. According to the configuration of the embodiment, the suction speed v by the shunt exhaust structure 8 is
[Cm / s] is uniform in the cross section of the diameter of the outlet pipe and is stable, so that the classified particle diameter δ [cm] according to the equation 1 becomes constant.

[0017]

As described above, according to the present invention, in the cyclone type dust collecting apparatus, the fine particle discharge side structure inserted from the upper wall at the axial center position of the classification chamber becomes a split flow exhaust structure, By ensuring a uniform flow velocity in the cross-sectional direction, the classification point is stable and the classification accuracy is improved, and the effect of implementing the present invention is extremely large.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a cyclone type dust collecting apparatus according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a vertical cross-sectional view showing a conventional cyclone type dust collector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical part 2 Cone part 3 Coarse grain discharge port 4 Classification chamber 5 Inversion board 8 Dividing flow exhaust structure 9 Eddy current inflow structure 10 Outer cylinder 11 Inner cylinder 12 Fine particle discharge port 13 Dividing cylinder 14 Cylindrical diversion chamber 15 Dust-containing fluid inflow pipe 16 Flow divider 17 Dust-containing fluid inlet

Claims (2)

[Claims] 1. A cylindrical portion is connected to an upper end of an inverted conical cone portion.
And a coarse particle discharge port is opened at the lower end
In both cases, a frusto-conical reversal plate was installed in the classification room,
Cyclone type with dust-containing fluid inflow pipe and fine particle discharge port
In the dust collector, the fine particle discharge port is provided at the axial center of the upper wall of the cylindrical portion.
Insert the inner cylinder concentrically with the outer cylinder and extend it into the classification chamber 4.
The outer cylinder is longer than the inner cylinder in the distance from the reversing plate
And the dust-containing fluid inflow pipe.
A cylindrical shunt formed concentrically outside the outer cylinder.
Under the cylindrical diversion chamber, protruding from one side of the chamber in the tangential direction
It is located at the end and swirls from the inner wall of the flow distributor toward the inner diameter.
The dust-containing fluid inlet with a plurality of shunt blades
Cyclone type dust collector characterized by being configured. 2. The split flow exhaust structure comprises an inner cylinder having a diameter of approximately 0.7d inserted concentrically with an outer cylinder having a diameter d, and
2. The cyclone type dust collecting apparatus according to claim 1, wherein the distance between the two cylinders extending to the classification chamber from the reversing plate is such that the outer cylinder is L and the inner cylinder is approximately 1 / 2L.