TW202041267A - Filtration device - Google Patents

Abstract

A filtration device is provided, including: a casing, including an inlet passage and an outlet passage which are arranged on an extension direction; a plurality of blades, extending spirally on an inner circumferential wall of the inlet passage relative to the extension direction; a guiding mechanism, including a first tapering portion tapered in a direction toward the inlet passage, disposed in the casing and located between the plurality of blades and the outlet passage.

Description

filter

The invention relates to a filtering device.

Generally, the method of filtering dust-containing gas or separating particles of different sizes is to cause the to-be-treated object to cause a swirling flow, and the particles with larger masses can be separated by flowing to the outside of the swirling flow by the principle of centrifugal force. Therefore, the conventional device has a cylindrical casing forming a swirling flow space and a diversion mechanism that can cause dust-containing gas to swirl inside the casing, and the structural design of the diversion mechanism and its coordination with the casing Directly affect the filtering effect of dust and gas. However, the conventional filter device is poorly configured, and the object to be processed often rubs and collides with the device, resulting in poor swirling effect, which in turn causes additional kinetic energy consumption and poor separation efficiency.

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

The main purpose of the present invention is to provide a filtering device with high separation efficiency. In order to achieve the above objective, the present invention provides a filter device, including: a housing including an inlet channel and an outlet channel located in the same extending direction; a plurality of blades spirally extending from one of the inlet channels relative to the extending direction Inner peripheral wall; a diversion mechanism, including a first tapered portion that tapers toward the inlet channel, is provided in the housing and located between the plurality of blades and the outlet channel.

The following examples are only used to illustrate the possible implementation aspects of the present invention, but they are not intended to limit the scope of protection of the present invention, and are described first.

Please refer to FIGS. 1 to 8, which show a preferred embodiment of the present invention. The filter device 1 of the present invention includes a housing 10, a plurality of blades 20 and a guide mechanism 30.

The housing 10 includes an inlet channel 11 and an outlet channel 12 located in the same extending direction L; the plurality of blades 20 extend spirally on an inner peripheral wall of the inlet channel 11 relative to the extending direction L; the flow guiding mechanism 30 It includes a first tapered portion 31 that tapers toward the inlet channel 11, and the flow guiding mechanism 30 is disposed in the housing 10 and located between the plurality of blades 20 and the outlet channel 12, thereby forming a swirling flow And has high separation efficiency. The housing 10, the inlet channel 11, the outlet channel 12 and the first tapered portion 31 preferably have a circular cross-section, with the lowest flow resistance and the lowest kinetic energy loss.

The flow guiding mechanism 30 further includes a second tapered portion 32 that tapers toward the outlet channel 12. In the extending direction L, the first tapered portion 31 does not overlap the inlet channel 11, and the second tapered portion The constriction 32 does not overlap with the outlet channel 12, and has a proper flow distance to improve the separation efficiency. The distance between a port 111 of the inlet channel 11 and the first tapered portion 31 is preferably between 10 to 30 mm, which can ensure that the dust-laden gas flows through the guide mechanism 30 after being swirled and accelerated by the plurality of blades 20. Accumulation is blocked and the separation effect is better. In this embodiment, the diversion mechanism 30 is an oval structure and includes a sharp end and a blunt end disposed oppositely, the first tapered portion 31 is the sharp end, and the second tapered portion 32 is the Blunt end, the sharp end has a small radial cross section and the oval structure has no edges and corners, which can reduce the influence on the swirl. The gas inside the swirl can tend to be due to the Coanda Effect (or Coanda Effect) Enter the exit channel 12 along the blunt end. The ratio of the long axis to the short axis of the oval structure is preferably 1.1 to 1.5. The inclination angle and the axial length of the sharp end and the blunt end can be changed according to the configuration requirements to adjust the gas flow path. In other embodiments, the first tapered portion and the second tapered portion may be a cone or cones of other geometric shapes, respectively.

The housing 10 further includes a cylindrical portion 13 located in the extending direction L and a dust exhaust channel 14 transversely connected to the cylindrical portion 13. The dust exhaust channel 14 is located radially outward of the outlet channel 12 and opposite to the barrel The part 13 is arranged on the side and viewed along an axial direction of the dust discharge channel 14, the dust discharge channel 14 at least partially protrudes from the cylinder part 13 in the extending direction L, which facilitates the rapid and smooth discharge of the dust along the inertial direction. The housing 10 further includes a guide portion 15 that connects the cylinder portion 13 and the dust discharge channel 14 obliquely. Viewed along the axial direction of the dust discharge channel 14, the guide portion 15 is located outside the cylinder portion 13 The guide portion 15 can be a curved surface or a flat surface, which can guide the dust located on the outer periphery of the swirling flow into the dust discharge channel 14 and be discharged and prevent the dust from colliding back into the cylinder 13.

The outlet passage 12 includes a pipe 121 connected to the barrel portion 13 and a retaining edge 122 provided around the pipe 121. Viewed along the axial direction of the dust exhaust channel 14, the retaining edge 122 is at least partially located in the dust exhaust channel Within the range of 14, the centrifugal separated dust can be prevented from flowing backward into the outlet channel 12 along the space between the cylinder 13 and the pipe 121. The retaining edge 122 gradually expands toward the outlet channel 12 and includes an annular groove 123 open to the outlet channel 12, which can effectively prevent dust from entering the dust exhaust channel 14 and being discharged. Preferably, the ratio of the inner diameter of the cylindrical portion 13 to the radial size of the outlet channel 12 is between 1.5 and 2.5, which has sufficient swirling space. Of course, the inner diameter of the barrel and the radial size of the outlet channel can also be configured in other ratios according to structural requirements.

The housing 10 further includes a flaring portion 16 connected between the inlet passage 11 and the barrel portion 13 and gradually expanding from the inlet passage 11 toward the outlet passage 12, the first tapered portion 31 and the second There is a largest diameter portion 33 between the two tapered portions 32. The largest diameter portion 33 is located in the barrel portion 13 and is adjacent to the connection between the barrel portion 13 and the flaring portion 16, whereby the larger mass of dust is caused by The centrifugal force is relatively large, so that the maximum diameter portion 33 can rotate outward along the inertia direction and is discharged toward the dust discharge channel 14 to avoid collision and kinetic energy loss caused by dust leaving the swirling flow at the flaring portion 16. The flow guiding mechanism 30 is connected and supported to the outlet channel 12 via at least one supporting member 34. In this embodiment, the at least one supporting member 34 is plural, which increases the stability and does not affect the swirling flow (especially the radially outer side). And the dusty part). Of course, the flow guiding mechanism can also be connected to the inner wall surface of the housing by the at least one supporting member.

[數學式2]

Each of the blades 20 has an end surface 21 adjacent to one side of the first tapered portion 31, and each end surface 21 is flush with the port 111 of the inlet passage 11, which can reduce the generation of turbulence and form a swirling flow. good. Preferably, each of the blades 20 spirally extends along a cycloid path 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 a circle of radius r rolls on the x-axis without sliding (as shown in Figure 5). The cycloid is defined as a function of the rotation angle t It shows that when the radius of the circle is r and the rotation angle is t, the function formula is as shown in the following [Math 1] and [Math 2]. [Math 1]

[Math 2]

In order to convert a two-dimensional plane cycloid into a three-dimensional cycloid, if the differential function (Differential Function) that represents the Tangential Slope of each point on the cycloid is listed, it is the velocity function of the cycloid (Velocity Function). ), as shown in the following [Math 3]. [Math 3]

[數學式5]

Please refer to Figure 6, centered on the origin C1 on the XY coordinates, the circle with radius r is based on the origin C1, and the function formula of the circle with each rotation angle t is as follows [Math 4] and [Math 5 ] Shown. [Math 4]

[Math 5]

[數學式7]

[數學式8]

In order to use the velocity function formula to derive the three-dimensional cycloid function formula, if the circle function formula is centered at the origin C1 by an angle t each time, the velocity function formula of the listed differential function formula is the Z axis, and The center point of the circle moves from C1 to C2 on the Z axis at the same time. Each time the angle t is moved, the circle with C1 as the midpoint and radius r is the base, and the height is the distance from C1 to C2. On the cylindrical surface of, the trajectory of the movement of any point P on the circle becomes a three-dimensional cycloid, and the function formula of the three-dimensional cycloid is shown in the following [Math 6] to [Math 8]. [Math 6]

[Math 7]

[Math 8]

The plurality of blades 20 of the present invention employs a three-dimensional cycloid, and the distance between each blade 20 extending toward a cycloid of the first tapered portion 31 and the surface of the first tapered portion 31 is not more than 5 mm, for example but Without limitation, the cycloid extension 22 may be tangent to the surface of the first tapered portion 31 and may swirl along the surface of the first tapered portion 31 to reduce the loss of kinetic energy due to friction. The minimum distance between each of the blades 20 and a central axis A in the extending direction L defines a through hole 23. The radial dimension of the through hole 23 is 0.15 to 0.5 times the radial dimension of the inlet passage 11, forming a spiral The flow effect is good and the flow rate is fast. With reference to FIGS. 7 and 8, each point on an inner edge 24 of each blade 20 defines a flared flow passage 25 that tapers toward the first tapered portion 31 around the central axis A, and the flared flow passage 25 Any cross section of the outer peripheral profile relative to the central axis A is located on a cycloid C. Thereby, after the dust-containing gas enters the inlet channel 11, it moves along the path with the shortest residence time on the plurality of blades 20 to form a swirling flow, thereby reducing the loss of kinetic energy due to friction and reducing the power source (such as a blower) ) The power required to feed dust-containing gas into the filter device 1.

With the above structure, when the dust-containing gas flows into the inlet channel 11, the plurality of blades 20 can guide the dust-containing gas to form a swirling flow around the central axis A. At this time, the dust with larger mass gas whirls outward along the inertial direction due to the greater centrifugal force, and then is discharged from the dust exhaust channel 14; the gas with smaller mass whirls inside the whirl, and can be moved along the wall by the coanda The flow guiding mechanism 30 flows into the outlet channel 12 to shorten the gas flow distance and achieve the effect of separation and filtration. Therefore, the filter device 1 has low kinetic energy loss and good centrifugal separation effect, and has a small volume, which is convenient for moving, loading and unloading.

1: filter device 10: Shell 11: entrance channel 111: port 12: Exit channel 121: pipe fittings 122: Shield 123: ring groove 13: Tube 14: Dust exhaust channel 15: Leading part 16: Flaring 20: Blade 21: End face 22: Cycloid extension 23: Through hole 24: medial edge 25: flared runner 30: Diversion mechanism 31: The first tapered part 32: second tapered part 33: Maximum diameter 34: Support L: Extension direction A: Central axis C: cycloid

Fig. 1 is a schematic diagram of the operation of a preferred embodiment of the present invention. Figure 2 is a perspective view of a preferred embodiment of the present invention. Figure 3 is a side cross-sectional view of a preferred embodiment of the present invention. Figure 4 is a top sectional view of a preferred embodiment of the present invention. Figure 5 is a schematic diagram of a two-dimensional cycloid. Figure 6 is a schematic diagram of a three-dimensional cycloid. Figure 7 is a partial enlarged view of a preferred embodiment of the present invention. Fig. 8 is a schematic diagram of a horn-shaped runner of a preferred embodiment of the present invention.

1: filter device

10: Shell

11: entrance channel

12: Exit channel

14: Dust exhaust channel

30: Diversion mechanism

Claims (10)

A filtering device includes: A housing, including an inlet channel and an outlet channel located in the same extending direction; A plurality of blades extend spirally on an inner peripheral wall of the inlet channel with respect to the extension direction; A flow guiding mechanism includes a first tapered portion that tapers toward the inlet channel, and is arranged in the casing and located between the plurality of blades and the outlet channel. The filtering device according to claim 1, wherein the flow guiding mechanism further includes a second tapered portion that tapers toward the outlet channel, and in the extending direction, the first tapered portion and the inlet channel do not overlap , The second tapered portion does not overlap with the outlet channel. The filtering device according to claim 2, wherein the flow guiding mechanism is an oval structure and includes a sharp end and a blunt end disposed oppositely, the first tapered part is the sharp end, and the second tapered part For the blunt end. The filter device according to claim 1, wherein the housing further includes a cylindrical portion located in the extending direction and a dust exhaust channel transversely connected to the cylindrical portion, and the dust exhaust channel is located radially outside of the outlet channel , When viewed along an axial direction of the dust exhaust channel, the dust exhaust channel at least partially protrudes from the barrel toward the extending direction. The filter device according to claim 4, wherein the housing further includes a guide portion connecting the cylinder portion and the dust discharge channel obliquely, viewed along the axial direction of the dust discharge channel, the guide portion is located at the Outside the tube. The filtering device according to claim 5, wherein the flow guiding mechanism further includes a second tapered portion that tapers toward the outlet channel, and in the extending direction, the first tapered portion and the inlet channel do not overlap , The second tapered portion does not overlap the outlet channel; the diversion mechanism is an oval structure and includes a sharp end and a blunt end disposed oppositely, the first tapered portion is the sharp end, the second The tapered part is the blunt end; the ratio of the long axis to the short axis of the oval structure is between 1.1 and 1.5; the outlet channel includes a pipe connecting the barrel part and a retaining edge provided around the pipe, along the In the axial view of the dust exhaust channel, the retaining edge is at least partially located within the scope of the dust exhaust channel; the retaining edge gradually expands toward the outlet channel and includes a ring groove that opens toward the outlet channel; The ratio of the inner diameter to the radial dimension of the outlet channel is between 1.5 and 2.5; the housing further includes a flaring connected between the inlet channel and the barrel and gradually expanding from the inlet channel toward the outlet channel Part, between the first tapered part and the second tapered part there is a maximum diameter part, the maximum diameter part is located in the cylinder part and adjacent to the connection of the cylinder part and the flaring part; the diversion mechanism is It is connected and supported to the outlet channel via at least one supporting member; each of the blades has an end face adjacent to one side of the first tapered portion, and each end face is flush with a port of the inlet channel; the port of the inlet channel The distance from the first tapered portion is between 10 and 30 mm. The filtering device according to any one of claims 1 to 6, wherein each of the blades spirally extends along a cycloid path. The filtering device according to claim 7, wherein the distance between each blade extending toward a cycloid of the first tapered part and the surface of the first tapered part is not more than 5 mm. The filtering device according to claim 7, wherein the minimum distance of each blade relative to a central axis in the extending direction defines a through hole, and the radial dimension of the through hole is 0.15 to the radial dimension of the inlet channel 0.5 times. The filter device according to claim 7, wherein each point on an inner edge of each of the blades defines a horn-shaped flow path that tapers toward the first tapered portion around a central axis in the extending direction, the horn Any cross section of the outer peripheral contour of the shaped runner relative to the central axis is located on a cycloid.

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