TW202000293A - Filtration system - Google Patents

Abstract

A filtration system is provided, including: a casing, including an inlet passage and an outlet passage which are arranged on an extension line; a guiding mechanism, including a first tapering portion tapered in a direction toward the inlet passage, a second tapering portion tapered in a direction toward the outlet passage and a plurality of blades, the plurality of blades extending spirally on the first tapering portion relative to the extension line, a gap being defined between the plurality of blades and the casing, and the gap being smaller than a height of one of the blades based on a surface of the first tapering portion.

Description

filtering system

The invention relates to a filtering system.

The general method of filtering dust-containing gas is to cause the dust-containing gas to cause a swirling flow, and the dust flowing outside the swirling flow is separated from the dust-containing gas by virtue of the centrifugal force principle. Therefore, the device has a cylindrical casing that forms a swirling flow space and a flow guide mechanism that causes a dusty gas to swirl inside the casing. The structural design of the diversion mechanism and its cooperation with the housing directly affect the filtering effect of the dust gas. However, the conventional filtering device is poorly configured and cannot effectively use the gas swirl, resulting in poor filtering effect.

Therefore, it is necessary to provide a novel and progressive filter system to solve the above problems.

The main purpose of the present invention is to provide a filtration system with high separation efficiency.

In order to achieve the above object, the present invention provides a filtration system, including: a housing including an inlet channel and an outlet channel located on the same extension line; a flow guide mechanism including a first taper that tapers toward the inlet channel A reduced portion, a second tapered portion tapered toward the outlet channel, and a plurality of blades, the plurality of blades spirally extend from the first tapered portion relative to the extension line, the plurality of blades and the housing A gap is formed between the inner walls of, the gap is smaller than a height of the blade relative to the surface of the first tapered portion.

The following merely illustrates the possible implementation forms of the present invention with examples, but it is not intended to limit the scope of the invention to be protected, and will be described first.

Please refer to FIGS. 1 to 5, which show a preferred embodiment of the present invention. The filter system 1 of the present invention includes a housing 10 and a flow guiding mechanism 20.

The housing 10 includes an inlet channel 11 and an outlet channel 12 on the same extension line L; the flow guiding mechanism 20 includes a first tapered portion 21 tapered toward the inlet channel 11 and a outlet toward the outlet channel A 12-direction tapered second tapered portion 22 and a plurality of blades 23 that spirally extend from the first tapered portion 21 relative to the extension line L, the plurality of blades 23 and the housing 10 A gap 30 is formed between the inner walls of the gap, the gap 30 being smaller than a height of the blade 23 relative to the surface of the first tapered portion 21. The housing 10, the inlet channel 11, the outlet channel 12, the first tapered portion 21 and the second tapered portion 22 preferably have a circular cross section, with the lowest flow resistance and the lowest kinetic energy loss. In this way, a swirl flow can be formed with high separation efficiency.

The housing 10 further includes a dust discharge channel 13 extending transverse to the extension line L. The dust discharge channel 13 is preferably located radially outward of the outlet channel 12 and is eccentrically disposed relative to the extension line L so that it is located The periphery of the cyclone can improve the dust collection efficiency. In this embodiment, the dust discharge channel 13 is a side tube along the radial direction of the outlet channel 12 and is gradually connected to a circular tube; the dust discharge channel can also be a circular tube as a whole, which does not reduce the swirling flow energy and is relatively No dirt. Of course, the dust discharge channel can also have different cross-sectional changes.

The outlet channel 12 includes a tube 121 connected to the housing 10 and a blocking edge 122 disposed around the tube 121, and viewed along an axial direction of the dust discharge channel 13, the blocking edge 122 is at least partially located in the tube 121 Within range. In this way, the baffle 122 prevents the centrifugally separated dust from entering the outlet channel 12 in a reverse swirling flow along the space between the housing 10 and the tube 121. In detail, the blocking edge 122 gradually expands toward the outlet channel 12 and forms a conical surface. The baffle 122 is provided with a plurality of fins 123, and the extending direction of the plurality of fins 123 is along the spiral direction of the blade 23, which can effectively block dust so that it can indeed fall into the dust discharge channel 13 and be discharged. The retaining edge 122 is preferably integrally punched to form a plurality of through holes 124 and the plurality of fins 123. The structure and manufacturing are simple. The multiple through holes 124 allow gas to flow and have a flow guiding effect and effectively avoid the retaining edge 122 A vortex is generated in the rear, which can maintain the swirling flow of the gas inside the casing 10.

The casing 10 further includes a flared portion 14 that gradually expands from the inlet channel 11 toward the outlet channel 12. Preferably, the flared portion 14 is detachably connected to facilitate disassembly, replacement, cleaning and cleaning maintain. The plurality of blades 23 and the flared portion 14 form the gap 30 so that the dust-containing gas can pass smoothly without reducing the swirling speed and causing no accumulation. According to different blade types, the gap 30 may be gradually expanded, tapered or equidistantly arranged in the direction of the inlet channel 11 or the outlet channel 12, and an appropriate configuration may provide the effect of compressing and accelerating the airflow. The first tapered portion 21 and the plurality of blades 23 partially extend into the inlet channel 11, and the dust-containing gas can begin to guide the swirl flow in the inlet channel 11 without being easily blocked. One end surface of each of the blades 23 is preferably a slanted surface 231, the slanted surface 231 follows the spiral direction of the blade 23, does not affect the swirl flow and minimizes the kinetic energy loss.

A surface of the second tapered portion 22 extends 221 through the outlet channel 12 and can direct airflow into the outlet channel 12. The flow guiding mechanism 20 is connected to and supported by the outlet channel 12 via at least one support member 24. The at least one supporting member 24 is preferably plural. A turning portion 25 is provided between the first tapering portion 21 and the second tapering portion 22. The plural supporting members 24 are connected to the turning portion 25 and the outlet passage 12. , Increase the stability without affecting the swirl flow (especially the radially outer part and the dusty part). However, the flow guiding mechanism 20 can also be connected and supported on the inner wall of the housing 10. In this embodiment, both the first tapered portion 21 and the second tapered portion 22 are cones; the cone angle of the first tapered portion 21 is not greater than the tapered angle of the second tapered portion 22; The distance between the cross section of the turning portion 25 transverse to the extension line L and the outlet passage 12 is not greater than twice the cone height of the second tapered portion 22, if properly matched with the tapered angle of the second tapered portion 22, The air flow of the separated dust may tend to flow along the second tapered portion 22 due to the Coanda Effect (or Coanda Effect), so that the air flow of the separated dust flows into the outlet channel 12, which can reduce the volume of the filter system 1 And has better filtration and separation effect.

With the above structure, the flow guiding mechanism 20 can guide the smooth flow of the dust-containing gas without forming turbulent flow and minimize the loss of kinetic energy. When the dust-containing gas flows in through the inlet channel 11, the plurality of blades 23 of the first tapered portion 21 guide the dust-containing gas to form a swirling flow with the extension line L as the axis. At this time, the dust with a larger mass than the gas swirls outward in the inertial direction due to the greater centrifugal force, and then is discharged through the dust discharge channel 13; the gas with a smaller mass swirls inside the swirling flow, which can be The second tapered portion 22 flows into the outlet channel 12 to shorten the gas flow distance while achieving the effect of separation and filtration. Therefore, the filter system 1 has low kinetic energy loss, and has a small volume, which is easy to move and load and unload.

[數學式2]

Preferably, each of the blades 23 has a cycloid C profile to provide the shortest path when the dust-containing gas changes direction to increase the separation efficiency. Cycloidal curve is defined as the trajectory formed by a point P on the circle when the circle of radius r rolls on the x-axis without sliding (as shown in Figure 6). The cycloid is a function of rotation angle t Performance, when the radius of the circle is r, and the rotation angle is t, the functional formula is shown in the following [Mathematical Formula 1] and [Mathematical Formula 2]. [Mathematical formula 1]

[Mathematical formula 2]

In order to convert a two-dimensional plane cycloid to a three-dimensional cycloid, if a differential function formula representing the tangential slope of each point on the cycloid line (Tangential Slope) is listed, it is a velocity function formula using a cycloid (Velocity Function) ), as shown in the following [Mathematical Formula 3]. [Mathematical formula 3]

[數學式5]

Please refer to FIG. 7, a circle with a radius r based on the origin C1 on the XY coordinates is based on the origin C1, and the function formula of the circle at each rotation angle t is as follows [Mathematical Formula 4] and [Mathematical Formula 5 ] As shown. [Mathematical formula 4]

[Mathematical formula 5]

[數學式7]

[數學式8]

In order to use this velocity function to derive a three-dimensional cycloidal function, if the circle's function is rotated at an angle t centered on the origin C1, the speed function of the differential function listed here is the Z axis. The center point of the circle moves from C1 on the Z axis to C2 at the same time, each time the angle t is moved, the circle with C1 as the midpoint and the radius r as the bottom edge, and the height from the distance from C1 to C2 as the height On the surface of the cylinder, the trajectory of any point P on the circle becomes a three-dimensional cycloid. The functional formula of the three-dimensional cycloid is shown in the following [Mathematical Formula 6] to [Mathematical Formula 8]. [Mathematical formula 6]

[Mathematical formula 7]

[Mathematical formula 8]

The blade 23 of the flow guiding mechanism 20 of the present invention uses a three-dimensional cycloid. When drawing a three-dimensional cycloid formed on the surface of a cylinder, if the value of the circle radius r is changed gradually according to the cone, a three-dimensional cycloid expressed on the surface of the cone is formed. Any cross section of each blade 23 parallel to the surface of the first tapered portion 21 is located on a cycloid C, respectively. Thereby, after the dust-containing gas enters through the inlet channel 11, it moves along the path with the shortest residence time on the plurality of blades 23, thereby reducing the loss of kinetic energy due to friction. Therefore, the centrifugal separation effect is better, and the power required by the power source (such as a blower) to send the dust-containing gas into the filter system 1 can be reduced.

1‧‧‧ Filtration system 10‧‧‧ Housing 11‧‧‧ Inlet channel 12‧‧‧ Outlet channel 121‧‧‧Pipe fitting 122‧‧‧Ball flange 123‧‧‧Finnel 124‧‧‧Through hole 13‧‧ ‧Dust discharge channel 14‧‧‧Expansion part 20‧‧‧Diversion mechanism 21‧‧‧First tapered part 22‧‧‧‧Second tapered part 221‧‧‧Surface extension 23‧‧‧Blade 231‧‧ ‧Slope 24‧‧‧Support 25‧‧‧Turning part 30‧‧‧Gap L‧‧‧Extension line C‧‧‧Cycloid

FIG. 1 is a partially cutaway perspective view of a preferred embodiment of the present invention. 2 is a partial cross-sectional view of a preferred embodiment of the present invention. 3 is a partial cross-sectional view of another preferred embodiment of the present invention from another perspective. 4 is a perspective view of a retaining edge of a preferred embodiment of the present invention. FIG. 5 is a side view of a deflector mechanism according to a preferred embodiment of the present invention. Fig. 6 is a schematic diagram of a two-dimensional cycloid. 7 is a schematic diagram of a three-dimensional cycloid.

1‧‧‧ Filter system

10‧‧‧Housing

11‧‧‧ Entrance channel

12‧‧‧Exit channel

122‧‧‧Ball

13‧‧‧ Dust extraction channel

20‧‧‧Diversion mechanism

24‧‧‧Support

Claims (14)

A filtering system includes: a housing including an inlet channel and an outlet channel on the same extension line; a flow guide mechanism including a first tapered portion tapering toward the inlet channel and a outlet channel A second tapered portion tapered in direction and a plurality of blades that spirally extend from the first tapered portion relative to the extension line, and a gap is formed between the blades and the inner wall of the casing , The gap is smaller than a height of the blade relative to the surface of the first tapered portion. The filtration system according to claim 1, wherein the housing further includes a dust discharge channel extending transverse to the extension line, the dust discharge channel being located radially outward of the outlet channel. The filtration system according to claim 2, wherein the outlet channel includes a pipe connected to the housing and a baffle rim arranged around the pipe, the baffle rim is at least partially viewed along an axial direction of the dust discharge channel Located within the scope of the pipe. The filtration system according to claim 3, wherein the retaining edge gradually expands toward the outlet passage. The filtration system according to claim 3, wherein the retaining edge is provided with a plurality of fins, and the extending direction of the plurality of fins is along the spiral direction of the blade. The filtration system according to claim 5, wherein the retaining flange is integrally punched to form a plurality of through holes and the plurality of fins. The filtration system according to claim 1, wherein the casing further includes a flared portion gradually expanding from the inlet channel toward the outlet channel, and the plurality of blades and the flared portion form the gap. The filtration system of claim 7, wherein the first tapered portion and the plurality of blade portions extend into the inlet channel. The filtration system of claim 1, wherein a surface of the second tapered portion extends through the outlet channel. The filtration system according to claim 1, wherein the flow guiding mechanism is connected and supported by the outlet channel via at least one support member. The filtration system according to claim 1, wherein one end surface of each of the blades is an inclined surface, and the inclined surface is along the spiral direction of the blade. The filtration system according to claim 6, wherein the retaining edge gradually expands toward the outlet channel; the housing further includes a flared portion gradually expanding from the inlet channel toward the outlet channel, the plurality of blades and the The flared portion forms the gap; the first tapered portion and the plurality of blade portions extend into the inlet channel; a surface of the second tapered portion extends through the outlet channel; the flow guiding mechanism is supported by at least one The connecting member is supported by the outlet channel; the at least one supporting member is plural; a turning part is provided between the first tapering part and the second tapering part, and the plurality of supporting parts are connected to the turning part and the outlet channel The first tapered portion and the second tapered portion are both cones; the cone angle of the first tapered portion is not greater than the cone angle of the second tapered portion; the turning portion is transverse to one of the extension lines The distance between the cross-section and the outlet channel is not greater than 2 times the cone height of the second tapered portion; one of the end surfaces of each blade is a slope, and the slope is along the spiral direction of the blade. The filtration system according to any one of claims 1 to 12, wherein each of the blades has a cycloidal profile. The filtration system according to claim 13, wherein any cross section of each surface of the blade parallel to the surface of the first tapered portion is located on a pendulum line.

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