JPH034369Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cyclone that centrifugally separates particles in gas (hereinafter abbreviated as dust), and specifically relates to a cyclone with high dust collection efficiency.

[Conventional technology]

A cyclone internally swirls gas containing dust and uses centrifugal force to separate and collect the dust from the gas.

Figures 9 to 13 are diagrams showing the configuration of a conventional cyclone. Figure 9 is a front view, Figure 10 is a left side view, Figure 11 is a plan view, and Figure 12 is a cyclone.
FIG. 13 is a cross-sectional view taken along line XII--XII in FIG. 11, and FIG. 13 is a cross-sectional view taken along line - in FIG.

Reference numeral 1 denotes a cyclone main body, which has a dust discharge port 2 at the lower end, a main body lower part 3 whose diameter gradually decreases toward the lower end discharge port 2, a substantially cylindrical main body upper part 4, these lower parts 3 and the upper part. 4, and has a main body intermediate part 5 having a slightly gentler slope than the lower part 3, and the upper surface part of the upper part 4 is covered with an upper lid 6,
A gas exhaust pipe 7 is connected to the center portion of the upper lid 6 (at a position concentric with the lower part 3 of the main body). The reference numeral 8 is an inner cylinder connected to the lower end of the gas exhaust pipe 7, and the reference numeral 9 is a dust exhaust pipe connected to the exhaust port 2.

In the conventional examples shown in FIGS. 9 to 13, the upper part of the main body has a shape that projects outward in a spiral manner as shown in FIG. A duct 11 is connected.

This gas introduction duct 11 has a rectangular cross section, and the gas introduction port 10 has a trapezoidal shape. At the connection part between the duct 11 and the inlet 10, the duct 11 is
As shown in FIG. 3, a triangular inclined plate 11a is provided so that the cross-sectional area gradually increases.

In the cyclone having such a configuration, the gas introduced into the cyclone from the duct 11 becomes a swirling flow, and dust subjected to centrifugal force is separated from the gas and discharged to the outside of the cyclone via the discharge port 2 and the discharge pipe 9. On the other hand, the gas from which the dust components have been separated flows into the inner cylinder 8 while swirling from the opening at the lower end thereof, passes through the gas exhaust pipe 7, and is extracted from the upper part of the cyclone.

Improving the dust collection efficiency of such a cyclone means reducing the amount of dust emitted from the cyclone without being collected, which reduces the apparent specific gravity of the gas and reduces the load on the fan. Become. Furthermore, when this uncollected dust is collected using an electrostatic precipitator or the like, the cost required for transporting the dust collected by the precipitator is also reduced. Therefore, cyclones are usually required to have high dust collection efficiency.

Although the conventional cyclones shown in FIGS. 9 to 13 can achieve a certain level of dust collection efficiency, if even higher dust collection efficiency is required, the gas inlet 10 can be used as shown in FIG. A guide plate 12 is provided on the downstream side of the rotation to narrow the gas flow path. Further, as shown in the figure, the gas exhaust pipe 7 is also arranged eccentrically in a direction away from the gas inlet 10.

When the guide plate 12 is provided in this way, the flow velocity of the swirling flow inside the cyclone increases, the centrifugal force becomes stronger, and the dust collection efficiency improves. In addition, if the gas exhaust pipe 7 is arranged eccentrically, the inlet port 1
The short-circuit flow in which the gas introduced into the cyclone from zero directly escapes to the gas exhaust pipe 7 is reduced, the resulting short-circuit outflow of dust is reduced, and the dust collection efficiency is improved.

[Problem that the invention attempts to solve]

However, when a guide plate is provided, the pressure loss that occurs at the confluence of the gas flow flowing into the cyclone and the swirling flow becomes significantly large. increases to

For this reason, it is expected to provide a cyclone that can improve dust collection efficiency without significantly increasing pressure loss.

[Means for solving problems]

In order to solve the above problems, the cyclone of the present invention has a duct with a rectangular cross-sectional shape and a substantially horizontal floor surface, and the duct and the opening surface of the gas inlet of the cyclone body are arranged in a substantially radial direction. It has an extended rectangular opening. This inlet is located above the gently sloped middle part of the cyclone body. At this gas inlet part, the duct is directly connected to the bottom of the duct while maintaining the horizontal floor surface without any slope, and the bottom surface of the connection between the duct and the cyclone body is extended approximately radially and vertically. The wall surface is steep. Furthermore, in the present invention, the gas exhaust pipe is eccentrically arranged on the side away from the duct connection part.

[Effect]

In the cyclone of the present invention, unlike the conventional example shown in FIGS. 9 to 13, the connection part of the duct to the inlet (the lower edge side of the inlet) is not inclined, and therefore the cyclone The gas can flow into the cyclone 1 without reducing the gas inflow speed at the gas introduction port. As a result, the velocity of the swirling flow inside the cyclone becomes stronger, and a larger centrifugal force acts on the dust, making it possible to improve the dust collection efficiency.

Further, in the present invention, since the gas discharge pipe is arranged eccentrically, the amount of dust discharged outside the cyclone due to the short-circuit flow is reduced, and the dust collection efficiency is improved.

〔Example〕 Examples will be described below with reference to the drawings.

1 to 5 illustrate one embodiment of the present invention, in which FIG. 1 is a front view, FIG. 2 is a left side view, FIG. 3 is a plan view, and FIGS. 4 and 5. are sectional views taken along the - line and - line in FIG. 3, respectively.

In the cyclone according to this embodiment, the gas introduction duct 11 has a rectangular cross-sectional shape, and its floor surface is horizontal up to the gas introduction port 10 of the cyclone body 1. The opening surface of the gas inlet 10 extends substantially in the radial direction with respect to the axis of the cyclone body 1 as shown. This gas inlet 10 is located above the main body intermediate portion 5 as shown in the figure. The lower surface side of the connection between the gas inlet 10 and the duct 11 extends substantially in the radial direction like the gas inlet 10, and forms a vertical wall surface 10a. Further, the gas exhaust pipe 7 is arranged eccentrically in the direction away from the gas inlet 10.

The rest of the structure is the same as that of the conventional example shown in FIGS. 9 to 13, so the same reference numerals are given to the same members and the explanation thereof will be omitted.

In the cyclone according to the embodiment configured as described above, unlike the conventional example in which the cross-sectional area of the duct 11 gradually increases toward the gas inlet, the gas flow velocity at the cyclone inlet does not decrease and the cross-sectional area of the duct 11 gradually increases toward the cyclone body. 1. Therefore, the swirling flow velocity within the cyclone 1 increases, and it becomes possible to apply a larger centrifugal force to the dust and improve the dust collection efficiency.

In addition, the gas exhaust pipe 7 and the inner cylinder 8 are arranged eccentrically, which reduces the short-circuit flow from the inlet 10 to the inner cylinder 8, and reduces the amount of dust discharged to the outside of the cyclone 1 along with this short-circuit flow. This will improve dust collection efficiency. As will be described later, although the pressure loss slightly increases due to the eccentric arrangement of the gas discharge pipe 7, the above-mentioned improvement in dust collection efficiency sufficiently compensates for this increase in pressure loss.

In addition, in the cyclones shown in FIGS. 1 to 5, the middle part 5 of the main body connecting the upper part 4 and the lower part 3 of the main body is inclined as in the conventional example, but this is due to the swirling flow inside the cyclone 1. It has the effect of promoting the quick settling of dust into the dust discharge pipe 6 below by gravity. As a result, the amount of dust discharged from the cyclone 1 along with the short-circuit flow passing directly from the upper part 4 of the cyclone 1 to the gas discharge pipe 7 is reduced, and the dust collection efficiency is improved.

In addition, by providing this inclined intermediate portion 5, the swirling flow inside the cyclone 1 is guided downward, reducing the number of turns of the swirling flow generated inside the cyclone 1, and reducing the pressure generated by the swirling flow. Loss can be reduced. Note that gas and dust are separated by the centrifugal force that acts on the dust in the swirling flow, so if the number of swirls is reduced in this way, the centrifugal force will be weakened, and there is a risk that the dust collection efficiency will decrease accordingly. However, the effect of reducing the dust carried by the short-circuit flow as described above is greater than that, and overall the dust collection efficiency can be maintained or increased, and the pressure loss of the cyclone 1 can be reduced.

6 to 8 show the structure of a cyclone according to different embodiments of the present invention, in which FIG. 6 is a front view, FIG. 7 is a left side view, and FIG. 8 is a plan view. The embodiments shown in FIGS. 6 to 8 are constructed so that the upper part 4 of the main body partially protrudes outside the cyclone main body 1, and the embodiments shown in FIGS. 1 to 8 are similar to those shown in FIGS. It has the same configuration as the embodiment shown in FIG. 5, and the same members are given the same reference numerals and their explanations will be omitted. In the embodiments shown in FIGS. 6 to 8, the embodiments shown in FIGS.
Similar to the embodiment shown in the figure, it is possible to significantly improve dust collection efficiency without significantly increasing pressure loss.

FIG. 15 is a graph showing the measurement results of the dust collection efficiency and cyclone pressure loss of the cyclone according to the example of the present invention and the cyclone according to the conventional example. This example of the present invention is related to the embodiment shown in Figs. 1 to 5, and the first conventional example is the embodiment shown in Figs. 9 to 13.
This is the conventional example shown in the figure, and the second conventional example is the 14th conventional example.
This is the cyclone shown in the figure.

As is clear from FIG. 15, it is recognized that the cyclone of the present invention can achieve extremely high dust collection efficiency without significantly increasing pressure loss compared to the first conventional example. In contrast,
In the second conventional example, although the dust collection efficiency is improved, the pressure loss also increases considerably.

[Effects of the Invention] As is clear from the above embodiments, the present invention provides a cyclone that has extremely high dust collection efficiency without significantly increasing pressure loss.

[Brief explanation of drawings]

Fig. 1 is a front view of a cyclone according to an embodiment of the present invention, Fig. 2 is a left side view of the same, Fig. 3 is a plan view of the same, Fig. 4 is a sectional view taken along the line of Fig. 3, and Fig. 5
The figures are a sectional view taken along the line of FIG. 3, FIG. 6 is a front view of a cyclone according to a different embodiment of the present invention, FIG. 7 is a left side view of the same, and FIG. 8 is a plan view of the same. Figure 9 is a plan view showing a conventional cyclone;
The figure is a left side view of the same, FIG. 11 is a plan view of the same, FIG. 12 is a sectional view taken along the line XII-XII of FIG. 11, FIG. 13 is a sectional view taken along the line of FIG. FIG. 3 is a plan view showing an example. FIG. 15 is a graph showing the measurement results of the dust collection efficiency of the cyclone. 1...Cyclone body, 2...Dust outlet, 3...Bottom part of main body, 4...Top part of main body, 7...Gas exhaust pipe, 10...Gas inlet, 11...Duct.

Claims (1)

[Scope of Utility Model Registration Claim] A cyclone body whose lower part gradually reduces in diameter toward the lower end discharge port and whose upper part is approximately cylindrical, an upper lid that covers the upper surface of the cyclone body, and a connection to approximately the center of the upper lid. and a gas introduction duct connected tangentially to the upper side wall of the cyclone body, the cyclone having a cylindrical upper part and a lower part whose diameter decreases toward the lower end. , a middle part of the main body is provided with a gentler slope than the lower part, the duct has a rectangular cross-sectional shape with a substantially horizontal floor surface, and the inlet of the cyclone main body to which the duct is connected has an opening surface that is similar to the cyclone main body. The inlet is a rectangular opening extending substantially in the radial direction of the main body, and the inlet is located above the middle part of the main body, and the lower edge portion of the inlet extends substantially in the radial direction and is vertical. A cyclone, characterized in that the cyclone has a steep wall surface, and the gas exhaust pipe is eccentrically arranged on a side away from the duct connection part.