JP2013226495A - Dust collecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a speed of a cyclone flow to efficiently separate dust or mist-like matter such as water-soluble oils and fats from exhaust gas by performing the reduction of inflow resistance in time of exhaust gas introduction into a casing of a dust collecting device and early generation of a swirl flow.SOLUTION: A first introduction duct 2 leading exhaust gas from an exhaust gas duct 6 into a tubular casing 1 making the exhaust gas occur as a cyclone flow changes an interval between the outer circumferential side wall face 21 and the inner circumferential side wall face 22 such that a cross section gradually becomes small from an exhaust gas introduction side toward the downstream side of an exhaust gas flow, and the outer circumferential side wall face 21 is connected such that the exhaust gas introduction side imparts an incident angle to the exhaust gas flowing into the casing 1 in a state that the exhaust gas introduction side is inclined to the inner circumferential side wall face 22 side from a tangent line direction with the casing 1.

Description

  The present invention relates to a dust collecting apparatus that separates and removes dust contained in the air, mist-like substances of water-soluble oils and fats, and the like.

Conventionally, in a cyclone type dust collector, air (exhaust gas) containing dust or mist-like substances of water-soluble fats and oils is sucked and a swirling flow is generated inside to collect dust or mist-like substances of water-soluble fats and oils. It is collected by centrifugation.
The airflow flows downward while generating a swirling flow along the wall surface in the dust collector, reverses at the lower part of the apparatus, and is discharged to the outside of the apparatus through the flow path inside the apparatus.
In the cyclone type dust collector, it is known that the higher the speed of the swirl flow, the higher the separation performance of dust and mist-like substances of water-soluble fats and oils.

Generally, as shown in FIG. 8, the introduction duct 011 is connected in a tangential direction to the inner peripheral wall of the casing 010, so that exhaust gas from the introduction duct 011 does not collide with the inner peripheral wall of the casing 010. There is little loss.
FIG. 8 shows a schematic diagram of a horizontal cross-sectional shape of a connection portion between an exhaust gas introduction duct 011 to a cyclone dust collector and a casing 010 for generating a cyclone flow.
Since the exhaust gas from the introduction duct 011 becomes a turbulent flow and is introduced into the wide casing 010 from the pressurized narrow introduction duct 011, the exhaust gas and the inner wall surface of the casing 010 are located near the introduction port in the casing 010. A windless area 012 occurs between them, the flow resistance of the exhaust gas in the casing 010 increases, and the flow velocity decreases.

Japanese Unexamined Patent Application Publication No. 2010-17675 (Patent Document 1) is disclosed as a prior art of an introduction duct of a cyclone type dust collector.
According to Patent Document 1, a guide plate is provided along the outer periphery of the air vent from the air inlet, so that the collision between the inflow air flowing from the air inlet and the swirling flow generated in the annular chamber is reduced, and the pressure loss of the swirling flow is reduced. Technical disclosure is made.

As another prior art, Japanese Patent Application Laid-Open No. 2011-74826 (Patent Document 2) is disclosed.
According to Patent Document 2, a gas introduction pipe is connected in a tangential shape to a peripheral wall of a cylindrical case, and a gas outlet pipe is provided on an axis inside the case. The oil mist is centrifuged from the gas introduced from the gas introduction pipe in the case.
A technique is disclosed in which oil mist in gas that has not been separated by centrifugation is attached so that the opening at the bottom of the gas outlet pipe is closed with a filter, and the oil mist is captured by the filter.

JP 2010-17675 A JP 2011-74826 A

However, in Patent Document 1, a guide member is provided in order to alleviate the collision between the inflowing air flowing in from the air inlet and the swirling flow generated in the annular chamber, and the structure becomes complicated and the cost increases. Moreover, the collision of two swirling flows is avoided, and a decrease in flow velocity cannot be prevented.
Further, Patent Document 2 discloses a structure in which a gas introduction pipe is connected to a peripheral wall of a cylindrical case on a tangent line thereof, and a filter for capturing oil mist in gas that could not be removed by a cyclone flow is disclosed. There is no technical disclosure for improving the oil mist separation effect by centrifugal action by increasing the speed of the cyclone flow in the cylindrical case.

  Therefore, the present invention has been made in view of such problems, and reduces the inflow resistance at the time of introducing exhaust gas into the casing of the dust collector and early generation of the swirl flow, thereby increasing the cyclone flow. The purpose is to efficiently separate dust and mist-like substances such as water-soluble oils and fats from exhaust gas.

  The present invention is to achieve such an object, and is connected to a blower for sucking exhaust gas, an exhaust gas duct connected to the blower through which the exhaust gas sucked flows, and an exhaust duct connected to the exhaust gas duct. And a cylindrical casing for generating exhaust gas guided by a duct as a cyclone flow, wherein the introduction duct has a cross-sectional area that gradually decreases from the exhaust gas introduction side toward the downstream side of the exhaust gas flow. As described above, the distance between the outer peripheral side wall surface and the inner peripheral side wall surface is changed, and the outer peripheral side wall surface of the introduction duct is inclined toward the inner peripheral side wall surface from the tangential direction to the casing. It connects so that the incident angle may be given to the waste gas which flows in.

According to the present invention, the introduction duct is introduced by the venturi effect to change the interval between the outer peripheral side wall surface and the inner peripheral side wall surface so that the cross-sectional area gradually decreases from the exhaust gas introduction side toward the downstream side of the exhaust gas flow. The speed of exhaust gas can be increased, and a swirl flow can be generated efficiently.
Further, the outer peripheral side wall surface of the introduction duct is provided with the exhaust gas introduction side inclined toward the inner peripheral side wall surface side from the tangential direction to the casing so as to make an incident angle to the exhaust gas flowing into the casing. Since it flows into the inside, the swirl energy by the reflected energy on the inner wall surface of the casing is given, and the swirl flow can be efficiently generated.
Therefore, the centrifugal action can be strengthened by efficiently generating the swirl flow.

  In the present invention, preferably, an angle formed between the tangent and the outer peripheral side wall is 10 ± 5 degrees.

By adopting such a configuration, when the angle θ is less than 5 degrees, the exhaust gas introduced from the introduction duct into the casing is located on the downstream side of the introduction hole of the casing between the inner peripheral surface of the casing and the exhaust gas. Cavitation) occurs, and the cyclone flow rate in the casing tends to decrease. Moreover, since there is little reflection on the inner wall surface of the casing, the effect of the reflected energy on the turning energy cannot be expected.
On the other hand, when the angle θ is 16 degrees or more, the exhaust gas collides with the inner peripheral wall surface of the casing, energy that generates a cyclone flow in the casing is consumed, and the cyclone flow velocity in the casing decreases. That is, energy loss due to reflection on the inner wall surface of the casing is increased, and application to turning energy cannot be expected.

  Preferably, in the invention of the present application, the outer peripheral side wall surface is tangential from a first position, which is a joint point with the casing, at a second position that is 1.5 times the radius of the casing, and is a method in the first position. It is good for it to be a plane which is parallel to a line and includes a line inclined in the direction of the first position from the third position moved 1/4 of the radius toward the inner peripheral side wall surface.

  With such a configuration, the outer peripheral side wall surface of the introduction duct is parallel to the normal line at the first position at the second position 1.5 times the casing radius from the first position on the tangential line, and the inner circumference. The mainstream of the exhaust gas introduced from the introduction duct to the inner peripheral surface of the casing is a casing including a line inclined toward the first position from the third position moved by ¼ of the radius on the side wall surface side. Since it is introduced with an incident angle with respect to the inner peripheral surface, it flows while being guided by the casing inner peripheral surface immediately after exiting the introduction hole. The flow resistance of the cyclone flow in the casing can be suppressed, and the centrifugal action can be strengthened.

  Preferably, in the present invention, the inner peripheral side wall surface side of the introduction duct is moved from the third position to the center side of the casing in parallel with the normal line by the radius R, and A plane including an inclined line that is parallel to the tangent from the center of the casing and that connects a parallel line translated to the tangential side by a half of the radius and a fifth position that is an intersection of the casing inner wall surface. In the outer peripheral side wall surface and the inner peripheral side wall surface, the cross-sectional area from the exhaust gas introduction side of the introduction duct to the introduction hole provided in the connection portion between the introduction duct and the casing may be gradually reduced. .

  With such a configuration, the inner peripheral side wall surface side is moved from the fourth position along the normal line by the radius R, and the tangent line is ½ of the radius R toward the center of the casing. Since the plane includes an inclined line that connects the parallel line that has been translated and the fifth position, which is the intersection of the inner wall surface of the casing, the exhaust gas introduction side position of the introduction duct is closer to the center of the casing than the introduction hole. As a result, the incident angle of the exhaust gas into the casing becomes small (with respect to the tangent to the outer peripheral surface of the introduction hole), so that the exhaust gas is easy to follow along the inner wall of the casing and from the exhaust gas introduction side of the introduction duct to the introduction hole side. By gradually reducing the cross-sectional area and causing a venturi action on the exhaust gas, the flow rate of the exhaust gas is increased, the cyclone flow in the casing is strengthened, and the waste substances contained in the exhaust gas are increased. Heart separation is to be carried out efficiently.

  Further, in the present invention, preferably, a plurality of eaves members that support the plurality of casings, an exhaust gas blowing duct that is disposed at a central portion of the plurality of casings and that is connected to each introduction duct of the casing, and the exhaust gas blowing duct It is preferable to provide an exhaust gas pumping device for pumping the exhaust gas.

  By adopting such a configuration, the exhaust gas blowing duct is disposed at the center of the plurality of casings, the casing is disposed around the casing, and the respective introduction ducts are connected to the exhaust gas blowing duct. A large amount of exhaust gas can be collected at the same time, one exhaust gas blow duct for introducing exhaust gas into the casing can be handled by one, the cost of the entire device can be reduced, and the space for installing the dust collector can also be reduced .

The exhaust gas incident angle from the introduction duct with respect to the outer peripheral surface of the casing is set to a small incident angle along the outer peripheral surface of the casing. Therefore, the main flow of exhaust gas introduced from the introduction duct to the inner wall surface of the casing is the exhaust gas flowing into the casing. Since it flows into the casing in such a manner that the incident angle is set at the angle, the swirling energy by the reflected energy on the inner wall surface of the casing is given, and the swirling flow can be efficiently generated.
Therefore, the centrifugal action can be strengthened by efficiently generating the swirl flow.

The separator schematic of the cyclone type dust collector concerning the embodiment of the present invention is shown. The cross-sectional ZZ arrow line view of FIG. 1 is shown. (A) shows the perspective view of the reprocessing part arrange | positioned at the upper part of a casing, (B) shows the detailed perspective view of the 2nd introduction duct of (A). FIG. 4 shows a plan view of FIG. 3. The whole dust collector concerning the embodiment of the present invention is shown schematic. FIG. 6 is a plan view of FIG. 5. The distribution map of the wind speed in the casing by the change of the outer peripheral side wall surface angle of an introduction duct is shown. An explanatory view of prior art is shown.

Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.
However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to specific examples unless otherwise specifically described. Only.

(Embodiment)
FIG. 5 shows an overall schematic diagram of the dust collector 5 of the embodiment of the present invention, and FIG. 6 shows a plan view of FIG.
The dust collector 5 includes a casing 1 that generates a cyclone flow in the pumped exhaust gas, and the casing 1 is arranged with the axis CL of the casing 1 in the vertical direction, and each of the four casings in plan view (see FIG. 6).櫓 8 that holds 1 at equal intervals, exhaust gas duct 6 at the center (in plan view) of each of the four casings 1, dust in the foundry, mist-like substances of water-soluble oils and fats in the exhaust gas duct 6, etc. Is mainly provided with a dust collection blower 7 that sucks and pumps exhaust gas, and a motor 9 that drives the dust collection blower 7 via a drive belt 9a.
Each of the four casings 1 and the exhaust gas duct 6 are connected by a first introduction duct 2 that is an introduction duct of the present invention disposed in each casing 1.
A dust chamber 14 is disposed at the lower end of each casing 1. The dust chamber 14 is a tray that receives the dust separated in the casing 1 and the mist-like substance of water-soluble oil and fat falling.
Reference numeral 51 denotes a chimney that emits purified exhaust gas.

FIG. 1 is a schematic view of a casing 1 which is a main body portion of a cyclone type dust collector according to an embodiment of the present invention.
The casing 1 is connected to an introduction hole 11a provided in the head portion 11 to be described later, and exhaust gas in which dust in a foundry or the like, a water-soluble fat and oil mist substance used as a sand mold release agent, etc. is floating. And a cylindrical head portion 11 whose upper portion is closed by a partition wall 11b, causing a swirling motion to occur in the exhaust gas introduced by the first introduction duct 2; A conical portion 12 which is continuous with the head portion 11 and is formed in a conical shape with a diameter reduced downward in the gravitational direction, and having a dust discharge portion 13 which opens at the lowermost end downward in the gravitational direction, and an upper portion of the head portion 11 A cylindrical reprocessing unit 16 that is adjacent to the head unit 11 and is formed to have the same diameter as the head unit 11, a lower end portion that opens to the conical portion 12, and an upper end portion that extends to the reprocessing unit 16. Open the exhaust gas from the cone 12 Through the cylindrical hollow portion is introduced into the re-processing unit 16, and a second inlet duct 17 to rise to the cyclone flow again exhaust gas 該再 the processing unit 16, a.

  Further, the exhaust gas outlet pipe 15 in which the axis of the cylindrical hollow portion is arranged coaxially with the axis CL of the casing 1, dust from a foundry or the like on the outer peripheral surface of the reprocessing unit 16, a mist-like substance of water-soluble fats and oils, etc. And an exhaust duct 18 for exhausting the exhaust gas from which the gas is removed.

FIG. 2 shows a cross-sectional view of the first introduction duct 2 in FIG.
The first introduction duct 2, which is the introduction duct of the present invention, has an outer peripheral side wall surface 21 disposed so as to be in contact with the outer peripheral surface of the head portion 11, a surface facing the outer peripheral side wall surface 21, and a direction in the intersecting direction. Then, a closed cross section is formed with the inner peripheral side wall surface 22 arranged so that the cross-sectional area decreases from the exhaust gas introduction side to the introduction hole 11a side.
The outer peripheral side wall surface 21 is moved from the first position P1 to the tangent line k at the first position P1 of the outer peripheral surface of the head portion 11 by a second position P2, which is moved from the first position P1 by 1.5R of the radius R of the head portion 11. From the second position P2, a third position P3 that is parallel to the normal line n at the first position P1 and moved by 1/4 R of the radius R to the inner peripheral side wall surface 22 is determined, and the first position from the third position P3 is determined. The surface includes the line m connected to P1.

By making such a structure, that is, by connecting the outer peripheral side wall surface 21 of the first introduction duct 2 to the casing inner wall surface 23 of the head portion 11 at an inclination, the flow flows along the outer peripheral side wall surface 21. The exhaust gas is introduced into the head portion 11 with an inclination with respect to the inner wall surface of the casing near the introduction hole 11a.
In this way, the exhaust gas flowing into the head portion 11 of the casing 1 flows in at an angle of incidence, so that swirl energy by the reflected energy on the inner wall surface of the casing is given, and a swirl flow can be efficiently generated. .
Therefore, when the exhaust gas passes through the introduction hole 11a, the flow efficiently occurs in the direction indicated by the arrow X as the cyclone flow by the inner wall surface of the head portion 11.

Further, the inner peripheral side wall surface 22 is moved from the third position to the axis CL of the head portion 11 by the radius R in parallel with the normal line n at the first position P1, and the axis CL of the head portion 11 is moved. It includes an inclined line 22a that is parallel to the tangent line k from the side and that is connected to the fifth position P5 that is the intersection of the casing inner wall surface 23 and the parallel line j that has moved to the tangential line k side by a radius R of 1 / 2R. It is a surface.
And the part including the cross-sectional part between the 1st position P1 and the 5th position P5 becomes the introduction hole 11a.
As a result, the first introduction duct 2 has a shape in which the cross-sectional shape between the outer peripheral side wall surface 21 and the inner peripheral side wall surface 22 from the exhaust gas introduction side to the introduction hole 11a becomes small, and the introduced exhaust gas flow is venturi. The speed is increased by the effect, and jetted toward the first position P1.
In addition, the same effect can be obtained even if the cross-sectional shape of the first introduction duct 2 is rectangular, circular, or elliptical.

As a result of various tests, the inventor has found that the exhaust gas introduced into the casing 1 from the introduction duct 2 is reduced to the casing 1 when the incident angle θ is small, that is, when the inclination is close to the tangential line (incident angle). On the downstream side of the inlet hole 11a, a windless area (blank part) is generated between the casing inner wall surface 23 and the exhaust gas, the flow resistance in the casing 1 is increased, the cyclone flow forming section is shortened, and the cyclone flow velocity is reduced. Decreases. Moreover, since there is little reflection on the inner wall surface of the casing, the effect of imparting the reflected energy to the turning energy cannot be expected.
On the other hand, when the angle θ is set to 16 degrees or more, the exhaust gas collides with the casing inner wall surface 23, and energy that generates a cyclone flow in the casing is consumed by the collision, so that the cyclone flow velocity in the casing is reduced. did. That is, energy loss due to reflection on the inner wall surface of the casing is increased, and application to turning energy cannot be expected.

FIG. 7 shows the casing 1 (head portion 11) when the angle θ formed between the surface including the line tangent k and the line m connected from the third position P3 to the first position P1, that is, the outer peripheral side wall surface 21, is changed. The flow rate of the exhaust gas in the inside is measured and the result is shown.
As a condition, the air volume Q from the first introduction duct 2 was set to 30 m ³ / min.
The circle at the center represents the wind speed. A radial line indicates a measurement position of the casing inner wall surface 23 obtained by dividing the entire circumference into 36 equal parts.

FIG. 7A shows the case of θ = 10 degrees, and the exhaust gas introduced from the exhaust gas introduction duct has the highest flow velocity at the first position P1, and the flow velocity is high in the range from the first position P1 to the PX position. After that, it was found that a cyclone flow was generated that was substantially uniform and caused an efficient centrifugal action.
The range from the first position P1 to the PX position can be determined as an adjustment period until an efficient cyclone flow is achieved.
FIG. 7B shows the case of θ = 15 degrees, and the exhaust gas introduced from the first introduction duct 2 is the fastest 10 degrees before the first position P1, and abruptly between the positions PY1 and PY2. The flow rate is decreasing.
This was determined to be because the incident angle (θ = 15 degrees) was large, and it collided with the casing inner wall surface 23 in the vicinity of the first position P1 to prevent the exhaust gas flow from being temporarily converted into a cyclone flow.
However, after position PY2, it returned to the flow velocity close to a circle, and although it was inferior to (A), it turned out that it is a swirl flow which achieves a target.
FIG. 7C shows the case of θ = 17 degrees, and the exhaust gas introduced from the exhaust gas introduction duct is the fastest from the first position P1 to the position PD1 (30 degrees before), and is located from the vicinity of the first position P1. It can be seen that the flow velocity of the exhaust gas rapidly decelerates toward PD2, and the change in the flow velocity in the downstream region is severe, resulting in a turbulent cyclone flow.
Therefore, an effective centrifugal separation action by the cyclone flow cannot be expected.

FIG. 7D shows the case of θ = 5 degrees, and the exhaust gas introduced from the first introduction duct 2 shows the fastest flow velocity in the vicinity of the position PZ1, but the value of the flow velocity is from θ = 10 degrees. It is low. After that, the flow velocity is constant over almost the entire area.
This is because when the incident angle θ is reduced, the cross-sectional area at the introduction hole 11a portion of the first introduction duct 2 is increased and the venturi effect is reduced from θ = 10 degrees in (A), and the fastest position is the first. Since the first position P1 has moved to the position PZ, there is an indication of the occurrence of an initial windless area (see FIG. 8) between the casing inner wall surface 3 and the exhaust gas flow at the first position P1. presume.
However, it was found that a cyclone flow was generated, in which the flow rate was generally uniform and an efficient centrifugal action occurred.
FIG. 7E shows the case of θ = 3 degrees, and the exhaust gas introduced from the exhaust gas introduction duct shows the fastest flow velocity at the PE1 position 30 degrees downstream from P1. Then, the flow velocity decreases rapidly from the position PE1 to the position PE2.
This is because the incident angle θ is close to the tangential direction with respect to the casing inner wall surface 23, a windless area is generated at the first position P1, the flow resistance at the portion increases, and the influence is accelerated at the position PE1. Estimated.
Moreover, it turns out that the change of the flow velocity in the downstream area | region after that is also the downstream of exhaust gas flow, and becomes a turbulent cyclone flow.
Therefore, an effective centrifugal separation action by the cyclone flow cannot be expected.
From the above results, it is understood that the effect of the present invention can be obtained by setting the angle θ formed between the tangent line k and the line m connecting the first position P1 and the third position P3 to θ = 10 ± 5 degrees. It was.

FIG. 3 is a perspective view of the reprocessing unit 16 disposed on the top of the head unit 11, and FIG. 4 is a plan view of FIG. The reprocessing unit 16 is partitioned by the head unit 11 and the partition wall 11b.
At the upper end of the exhaust gas outlet pipe 15, a second introduction duct 17 that causes a cyclone flow of exhaust gas in the reprocessing section 16 is formed in the same diameter as the exhaust gas outlet pipe 15 and in a cylindrical shape. The second introduction duct 17 protrudes up to an intermediate portion in the vertical direction (gravity direction) of the reprocessing unit 16, and a closing surface 17 a that closes the upper end and an outer peripheral surface of the second introduction duct 17 are perpendicular to the axis CL. A vertical shielding plate 17d extending to the reprocessing inner wall surface 16a so that the exhaust gas discharged from the ejection port 17b does not flow directly into the discharge duct 18, and an upper side of the vertical shielding plate 17d And a horizontal shielding plate 17c extending in a direction opposite to the discharge duct 18 and substantially the entire width of the opening (circumferential direction) of the jet port 17b and extending to the reprocessing inner wall surface 16a. .

The flow of the exhaust gas in the casing 1 formed as described above will be described.
The exhaust gas sucked by the dust collection blower 7 is pumped through the exhaust gas duct 6 and introduced into the head portion 11 of the casing 1 through the first introduction duct 2.
As described above, the first introduction duct 2 is disposed in a state where the outer peripheral side wall surface 21 of the first introduction duct 2 is inclined with respect to the casing inner wall surface 23 at the first position P1 of the head portion 11. The exhaust gas flowing in along the outer peripheral side wall surface 21 has a flow as a cyclone flow by the casing inner wall surface 23 when it passes through the introduction hole 11a.

On the other hand, the inner peripheral side wall surface 22 of the first introduction duct 2 is a surface including an inclined line 22a connecting the fifth position P5 and the sixth position P6, and the exhaust gas introduction side of the first introduction duct 2 has a radius R. However, the connecting portion with the introduction hole 11a has a shape in which the cross-sectional area is narrow at the hole portion between the second position P2 and the sixth position P6.
Therefore, from the exhaust gas introduction side of the first introduction duct 2 to the introduction hole 11a side, the flow rate of the exhaust gas becomes faster and the main flow (center) of the exhaust gas flow is directed to the vicinity of the second position P2. And jetted onto the casing inner wall surface 23.
As a result, the exhaust gas is guided to the cyclone flow from the vicinity of the introduction hole 11a of the head portion 11 by the casing inner wall surface 23 to become a fast cyclone flow, and dust, water-soluble fat and oil mist, etc. contained in the exhaust gas are contained. Efficient separation / removal by centrifugal action.
The removed dust, mist-like substances of water-soluble oils and fats flow along the inner wall surface 23 of the casing, flow downward, and are discharged from the dust discharge unit 13 to the dust chamber 14.

The exhaust gas that has become a cyclone flow at the head portion 11 descends while turning to the conical portion 12 side where the lower diameter becomes smaller.
As the diameter of the conical portion 12 decreases, the flow velocity increases, the pressure at the central portion of the diameter decreases, and the exhaust gas reverses and swivels in the exhaust gas outlet pipe 15 upwardly toward the central portion, while the reprocessing portion 16 side To flow into.
The cyclone flow of the exhaust gas accelerated by the conical part 12 further separates dust having a small mass, mist-like substances of water-soluble oils and fats, etc. contained in the exhaust gas.

The exhaust gas that has flowed out to the reprocessing unit 16 side is ejected into the reprocessing unit 16 from the ejection port 17 b of the second introduction duct 17 provided at the tip of the exhaust gas outlet pipe 15. The exhaust gas ejected from the ejection port 17b flows in a cyclone flow in the arrow Y direction by the vertical shielding plate 17d and the horizontal shielding plate 17c.
The cyclone flow rises and the exhaust gas discharged from the discharge port 18a of the discharge duct 18 located above the closing surface 17a of the second introduction duct 17 and the exhaust gas swirling in the reprocessing unit 16 across the discharge port 18a. And divided.

Therefore, when the exhaust gas becomes diluted, fine particles in the exhaust gas, mist-like substances of water-soluble fats and oils and the like can be easily separated, and the performance as a dust collector can be further improved.
The dust separated by the reprocessing unit 16 and the mist-like substance of water-soluble oils and fats are led out to the dust chamber 14 by piping not shown.

As described above, the first introduction duct 2 gradually reduces the cross-sectional area from the exhaust gas introduction side to the introduction hole 11a of the head portion 11 to improve the flow rate of the exhaust gas, and makes the main flow tangent to the head portion 11. On the other hand, by introducing the tilt angle within a predetermined range, the generation time of the cyclone flow in the head portion 11 is advanced, and the effect of imparting the reflected energy to the swirling energy is obtained, thereby strengthening the cyclone flow. can do. Thereby, the centrifugal separation effect of dust, mist-like substances of water-soluble oils and fats, etc. can be increased.
Further, in the embodiment of the present invention, four casings 1 are arranged at equal intervals, and the combination of the flanges 8 in which the exhaust gas duct 6 is arranged at the center thereof is combined. The center distance is short, and a large amount of exhaust gas can be collected, and the installation space can be reduced, and the cost of the apparatus can be reduced.

  It can be used in a dust collector that separates and removes dust contained in the atmosphere and mist-like substances of water-soluble oils and fats.

1 casing 2 first introduction duct (introduction duct)
DESCRIPTION OF SYMBOLS 5 Dust collector 6 Exhaust gas duct 7 Dust collector blower 8 ９ 9 Motor 11 Head part 12 Conical part 13 Exhaust part 14 Dust chamber 15 Exhaust gas outlet pipe 16 Reprocessing part 17 Second duct 18 Exhaust duct 21 Outer peripheral side wall surface 22 Inner peripheral side Wall surface 23 Inner wall surface of casing P1 1st position P2 2nd position P3 3rd position P4 4th position P5 5th position k tangent m Line 2 tangent line connected from 3rd position P3 to 1st position P1 R radius

Claims (5)

A blower for sucking exhaust gas;
An exhaust gas duct that is connected to the blower and through which the exhaust gas sucked flows;
A dust collector comprising: a cylindrical casing that is connected to the exhaust gas duct via an introduction duct, and that causes the exhaust gas guided by the introduction duct to be generated as a cyclone flow;
The introduction duct changes the interval between the outer peripheral side wall surface and the inner peripheral side wall surface so that the cross-sectional area gradually decreases from the exhaust gas introduction side toward the downstream side of the exhaust gas flow, and the outer peripheral side wall surface of the introduction duct is The dust collector is connected so that the exhaust gas introduction side inclines toward the inner peripheral side wall surface side from the tangential direction to the casing and makes an incident angle to the exhaust gas flowing into the casing.   The dust collector according to claim 1, wherein an angle formed between the tangent and the outer peripheral side wall is 10 ± 5 degrees.   The outer peripheral side wall surface is parallel to the normal line at the first position at a second position 1.5 times the radius of the casing on the tangent line from the first position, which is the junction point with the casing, and the inner wall surface. 3. The dust collector according to claim 1, wherein the dust collector is a surface including a line inclined toward the first position from the third position moved by ¼ of the radius toward the peripheral side wall surface.   The inner peripheral side wall surface side of the introduction duct is parallel to the normal line from the third position and moved to the center side of the casing by the radius R, and parallel to the tangent line from the center of the casing. And a plane including an inclined line connecting a parallel line translated to the tangential side by a half of the radius and a fifth position that is an intersection of the casing inner wall surface, and the outer peripheral side wall surface. 4. The cross-sectional area from the exhaust gas introduction side of the introduction duct to the introduction hole provided in the connection portion between the introduction duct and the casing is gradually reduced with the inner peripheral side wall surface. Dust collector.   An eaves member that supports the plurality of casings, an exhaust gas blower duct that is disposed at a central portion of the plurality of casings and that is connected to each introduction duct of the casing, and an exhaust gas pressure feeding device that pumps the exhaust gas to the exhaust gas blower duct The dust collector according to any one of claims 1 to 4, wherein the dust collector is provided.

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