JP4690267B2 - Air-flow swivel dryer with crusher - Google Patents

Description

  The present invention relates to an airflow swirl dryer with a crusher suitable for drying lightweight solids typified by pulverized waste plastic and wood chips.

  Conventionally, a dryer shown in Japanese Patent Application Laid-Open No. 2000-304445 has been proposed as an air dryer capable of setting a sufficiently long drying passage length in accordance with the amount of water to be dried conveyed by air. It has been found by our examination that lightweight solids such as wood chips are pulverized and dried while being transported in an air stream, which is suitable for reuse of the dried product after processing.

The present applicant has proposed the following system for applying such a lightweight solid to the dryer and air-drying (Patent Document 1). First, a system is proposed in which a breaker that provides an object to be dried is connected to the inlet of the air dryer, and secondly, the middle of the dry air pipe from the heater connected to the outer peripheral opening at the inlet of the air dryer. There has been proposed a system in which an object to be dried from a quantitative feeder is supplied to a section by a feeder via a rotary seal valve.
JP 2000-304445 A

This invention makes it a subject to improve and provide the air dryer with a crusher suitable for drying the lightweight solid substance represented by waste plastics and wood chips in the former system .

As a result of intensive studies to solve the above problems, the present invention provides:
A dryer suitable for drying lightweight solids typified by pulverized waste plastic and wood chips, a crusher that crushes the object to be treated, and a drier that dries the object to be crushed by this crusher. Equipped with a machine,
The above crusher
A cylindrical casing;
A rotary crushing section having a rotary shaft rotatably provided in the casing, and a crushing member fixed to the rotary shaft to crush the workpiece;
A supply port that is formed on the end surface of the cylindrical casing and to which the object to be processed is supplied together with dry air;
Formed on the peripheral surface of the cylindrical casing, having a workpiece to be crushed by the rotary crushing unit and a discharge port for discharging the dry air;
The dryer is
A pair of plates;
A partition plate that is arranged in a spiral shape between the pair of plates and forms a spiral airflow path;
An outer peripheral opening formed in the plate or partition plate and communicating with an outer peripheral end of the spiral airflow path;
A central opening formed in the plate and communicating with a central end of the spiral airflow passage;
The object to be processed and dry air discharged from the discharge port of the crusher are supplied from one of the outer peripheral opening and the central opening, and the drying is performed while passing through the air flow passage from the other of the outer peripheral opening and the central opening. The object to be processed dried with air is discharged.

  According to the above configuration, in the crusher, the object to be processed is supplied together with the dry air from the supply port formed on the end surface of the casing, and the object to be processed is rotated by the rotating shaft. Is broken up by. The to-be-processed object crushed is discharged | emitted from a discharge port with the said dry air. Even in a lightweight solid material represented by pulverized waste plastic and wood chips, the object to be treated is prevented from adhering to the inside of the rotary crushing part and the casing, and is effectively crushed, from the outlet. Efficiently discharged.

  In the dryer, the crushed workpiece is supplied from one of the outer peripheral opening and the central opening together with the dry air to the air flow passage. The object to be treated is dried while passing through the air flow passage together with the dry air, and is discharged from the other of the outer peripheral opening and the central opening. Since this dryer has a spiral airflow passage and can be effectively downsized, an airflow type swirl dryer with a crusher provided with this dryer and the above crusher can be downsized effectively. Therefore, this air-flow type swivel dryer with a crusher is suitable for pulverizing and drying lightweight solids represented by waste plastic and wood chips, and can effectively reduce the installation space.

  Further, according to the present invention, the heated air generated by the heater is supplied into the crusher, and the heated air flows as the dry air through the crusher and the dryer, thereby representing the pulverized waste plastic and wood chips. As a result of the light solids being broken apart one by one and the heat transfer being improved, it can be effectively dried.

  Furthermore, according to this invention, since the said dryer is comprised mostly by a pair of plate and a partition plate, decomposition | disassembly is easy and maintenance, such as cleaning, can be performed easily.

  An airflow type swirl dryer with a crusher according to an embodiment includes a heater that is connected to a supply port of the crusher and generates heated air as the dry air. Thereby, the efficiency of airflow drying can be improved.

An airflow swirl dryer with a crusher according to an embodiment includes the plurality of dryers,
The plate located between adjacent dryers is formed by a single shared plate,
The peripheral openings and the central openings of adjacent dryers are alternately communicated with each other.

  According to the embodiment, the plurality of dryers are manufactured with a small number of parts by using a plurality of partition plates having the same structure and forming a plate between adjacent dryers with a single shared plate. it can. Further, by setting the number of partition plates, the total extension of the airflow passage can be easily set to a length corresponding to the water content of the object to be processed, for example.

An airflow type swirl dryer with a crusher according to an embodiment includes a cyclone separator connected to the other of the outer peripheral opening and the central opening of the dryer, and a suction blower that sucks air from the cyclone separator.

  According to the embodiment, the material to be crushed discharged together with the dry air from the dryer is separated by the cyclone separator. In the cyclone separator and the dryer on the upstream side of the cyclone separator, an air flow is generated by the suction blower.

  The air-flow type swirl dryer with a crusher according to an embodiment includes a reflux path that is connected to the downstream side of the suction blower and returns a part of the air sucked from the cyclone separator to the heater.

  According to the embodiment, since a part of the air sucked from the cyclone separator is returned to the heater by the reflux path, the flow of air circulating through the heater, pulverizer, dryer, and cyclone separator. Can be generated. Thereby, dry air can be efficiently flowed through the crusher and the dryer.

  Hereinafter, the airflow type swirl dryer with a crusher of the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1 is a schematic view showing an airflow type swirl dryer with a crusher according to an embodiment of the present invention.

  This air-flow type swirl dryer with a crusher is for crushing and drying wood chips as an example of the object to be treated. The crusher 1 for crushing the object to be treated and the crusher 1 for crushing. And a drying unit 2 for drying the processed object.

  The crusher 1 is connected to a hot stove 4 as a heater and is also connected to a quantitative feeder 5. A downstream side of the drying unit 2 is connected to a cyclone separator 7, and the cyclone separator 7 is connected to a suction blower 8. The downstream side of the suction blower 8 is connected to the dust collector 9 and is connected to the hot stove 4 via the reflux path 81.

  FIG. 2A is a longitudinal sectional view showing a state where the crusher 1 is cut along the horizontal rotation shaft 12. FIG. 2B is a cross-sectional view showing a state where the crusher 1 is cut in the direction perpendicular to the horizontal rotation shaft 12 in the vicinity of the rotary hammer 15.

The crusher 1 houses a plurality of rotating hammers 15 as crushing members in a horizontal cylindrical casing 11. The rotary hammer 15 is rotationally driven by a motor 13 around the horizontal rotation shaft 12 and is connected to a concentric fixed to the horizontal rotation shaft 12 by a fixing member G as shown in the cross-sectional view of FIG. 2B. Each frame 14 is fixed so as to draw three concentric circles along the three annular frames 14. The rotary hammer 15 is fixed so as to be substantially parallel to the horizontal rotary shaft 12. The first small concentric rotating hammer 15 swivels around the inlet duct 17 which opens at the center of the opposite casing front wall, and the largest concentric rotating hammer 15 is the outlet duct 18 at the top of the casing 11. It is formed so as to swivel close to the opening. A fixed hammer 16 protruding toward the rotary hammer 15 is fixed to the end surface of the casing 11 on the side facing the tip of the rotary hammer 15. This fixed hammer 16 has a circle concentric with the arrangement shape of the rotary hammers 15 in a cross-sectional view, and between the first minimum concentric rotary hammer 15 and the second concentric rotary hammer 15 in the radial direction. And is arranged between the second concentric rotating hammer 15 and the largest rotating hammer 15. Each of the rotary hammer 15 and the fixed hammer 16 has a shape in which a hammer head having a diameter larger than that of the rod member is connected to the tip of the rod member.

  An inlet duct 17 is provided at a position facing the lateral rotary shaft 12 on the end face of the crusher 1 on the side where the fixed hammer 16 of the casing 11 is fixed. Through the inlet duct 17, heated air is supplied as dry air from the hot stove 4, and an object to be processed is supplied from the quantitative feeder 5.

An outlet duct 18 is provided at the upper end of the casing 11 of the crusher 1, and the crushed workpiece is discharged toward the drying unit 2 from the outlet duct 18. That is, the material to be crushed fed into the casing 11 from the inlet duct 17 is first pulverized by the rotation of the rotating hammer 15 having the smallest concentric circle and scattered around, and finally crushed by the rotating hammer 15 having the largest concentric circle and finally discharged by the outlet duct 18. Will be sent from.

  The hot stove 4 includes a burner 41, a combustion chamber 42 from which a combustion flame is discharged from the burner 41, and a ventilation path 43 that surrounds the outside of the combustion chamber 42, and the downstream side of the combustion chamber 42 and the ventilation path 43 is It merges and communicates with the inlet duct 17 of the crusher 1. The temperature of the heated air supplied to the crusher 1 by the hot stove 4 is set to an appropriate temperature according to the physical properties of the object to be processed. When the waste plastic is an object to be processed, it is preferably set to 60 to 120 ° C., and when the wood chip is an object to be processed, the temperature is preferably set to 90 to 180 ° C.

  The fixed amount feeder 5 has a storage tank 51 for storing the object to be processed supplied by the belt conveyor, and a rotary seal valve 52 attached to the lower end of the storage tank 51. The rotary seal valve 52 supplies a predetermined amount of workpieces to the crusher 1.

  FIG. 3 is a perspective view schematically showing the structure of the drying unit 2. This drying unit 2 is formed by two dryers 21 and 21. The dryer 21 has a spiral airflow passage 24 formed by a pair of plates 22 and 22 and a spiral partition plate 23 fixed between the plates 22 and 22. The plate 22 between the two dryers 21 and 21 is shared by each dryer 21. One of the two dryers 21 is provided with a supply port 26 to which the object to be processed is supplied from the crusher 1, and the object to be processed is supplied from the drying unit 2 to the other of the two dryers 21. A discharge port 27 for discharging is formed. The supply port 26 and the discharge port 27 are both formed at the outer peripheral side end of the spiral airflow passage 24 of each dryer. Central ends of the airflow passages 24 of the dryers communicate with each other through the through holes 28 of the plate 22 shared by the dryers 21 and 21. The airflow passage 24 is formed to have a substantially constant cross-sectional area over the entire length so as to keep the airflow velocity substantially constant so that the object to be processed does not stay. The airflow passage 24 is formed in a vortex shape so that the overall size is small.

  The supply port 26 and the discharge port 27 may be formed at the center side end of the airflow passage 24. In this case, the through hole of the shared plate 22 is formed at a position corresponding to the outer peripheral side end of the airflow passage 24 of each dryer 21, and the airflow passages 34 are communicated with each other at the outer peripheral side end. Further, the supply port 26 and the discharge port 27 may be formed in the plate 22 at a position corresponding to the outer peripheral side end of the airflow passage 24. The plates 22 and 22 forming the dryers 21 and 21 do not necessarily have to be parallel, but are preferably parallel from the viewpoint of preventing a large change in the air velocity. Further, the drying unit 2 may be formed by three or more dryers 21, and in this case, with respect to the adjacent dryers 21, 21, the outer peripheral side end and the central side end of the spiral airflow passage 24 are formed. What is necessary is just to connect sequentially one after another.

  The cyclone separator 7 is connected to a cylindrical portion 71 provided on the peripheral surface with a supply port to which the object to be processed is supplied from the dryer 21, and a cone that separates the object to be processed and air from the lower side of the cylindrical portion 71 The unit 72 is generally configured. A discharge port for discharging the air separated from the object to be processed is provided at the upper end of the cylindrical portion 71. A rotary seal valve 73 is connected to the lower end of the conical portion 72 so that the workpiece to be separated and accumulated in the conical portion 72 is discharged to the lower silo 75.

  The discharge port of the cyclone separator 7 is connected to the suction port of the suction blower 8. The suction blower 8 is formed of a sirocco fan whose rotating shaft is disposed horizontally. The discharge port of the suction blower 8 is connected to a dust collector 9 that captures dust from the discharge air. A reflux path 81 is connected between the suction blower 8 and the dust collector 9, and a part of the air from the intake blower 8 is returned to the ventilation path 43 of the hot stove by the reflux path 81.

  The airflow swirl dryer with a crusher having the above-described configuration operates as follows.

  First, the burner 41 of the hot stove is ignited and the suction blower 8 is activated, and heated air is supplied from the hot stove 4 to the crusher 1. The hot air furnace 4 can efficiently generate heated air by releasing the combustion flame into the combustion chamber 42 with the burner 41 and collecting the radiant heat from the burner 41 through the ventilation path 43.

  Subsequently, the wood chip obtained by firstly processing the wood with a crusher (not shown) is supplied to the storage tank 51 of the fixed quantity feeder by a belt conveyor. A predetermined amount of wood chips is supplied from the storage tank 51 to the crusher 1 by a rotary seal valve 52. By using the rotary seal valve 52, the flow of the heated air supplied from the hot stove 4 to the crusher 1 can be stably maintained.

  The crusher 1 rotationally drives a rotary hammer 15 with a motor 13 via a horizontal rotary shaft 12, and crushes wood chips supplied into the casing 11 from the inlet duct 17 with the rotary hammer 15 and the fixed hammer 16. To do. In the crusher casing 11, heated air as dry air is supplied together with the wood chips, so that moisture contained in the wood chips is appropriately evaporated. Therefore, it is possible to prevent the wood waste from adhering to the casing 11 and the hammers 15 and 16.

  Wood chips obtained by pulverizing the wood chips are discharged together with the dry air from the outlet duct 18 of the pulverizer and supplied to the supply port 26 of the drying unit. In the dryer 21 of the drying unit, the wood waste supplied from the supply port 26 is conveyed toward the center through the spiral airflow passage 24 of the first dryer 21 by the flow of dry air. The wood waste that has reached the center side end of the air flow passage 24 of the first dryer passes through the plate through hole 28 and enters the center side end of the air flow passage 24 of the second dryer 21, and this first The air passage 24 of the second dryer 21 is conveyed toward the outer peripheral side end. While being transported through the air flow passages 24, 24 of the first and second dryers, the moisture of the wood chips evaporates into dry air, and the wood chips are effectively dried. The wood waste that has reached the outer peripheral end of the air flow passage 24 of the second dryer 21 is discharged from the drying unit 2 together with the dry air. The wood waste discharged together with the dry air from the drying unit 2 is supplied to the cyclone separator 7.

  The cyclone separator 7 guides the wood waste and air supplied from the supply port into the cylinder portion 71 to the cone portion 72, generates a rotational flow of air in the cone portion 72, and separates air and wood waste. The wood waste separated from the air is accumulated in the lower part of the conical part 72 and is discharged to the silo 75 by the rotary seal valve 73. By using the rotary seal valve 73, the air flow from the cyclone separator 7 to the suction blower 8 can be stably maintained. The air separated from the wood waste is discharged from the discharge port at the upper end of the cylindrical portion 71 and sucked into the intake blower 8.

  A part of the air discharged from the intake blower 8 is returned to the ventilation path 43 of the hot stove by the reflux path 81. The air returned to the ventilating passage 43 of the hot stove recovers the radiant heat of the burner 41, is mixed with the combustion air from the burner 41, becomes heated air, and is sent again to the crusher 1 as dry air. Dust is removed from the other part of the air discharged from the intake blower 8 by the dust collector 9, and is discharged to the atmosphere from the discharge port of the dust collector 9.

  According to the airflow type swirl dryer with the crusher of the above embodiment, since the crusher 1 that crushes the object to be processed with the rotary hammer 15 and the drying unit 2 having the spiral airflow passage 24 are provided, the installation is relatively small. The space can be crushed and dried. Moreover, since the heated air produced | generated with the hot stove 4 is supplied to the crusher 1 with a to-be-processed object, the to-be-processed object after crushing adheres in the crusher 1, and prevents the problem that a crushing efficiency falls. it can. This effect is particularly effective when the object to be processed has a high water content such as garbage. Moreover, since the dryer 21 of the drying unit 2 is generally formed by the pair of plates 22 and 22 and the spiral partition plate 23, it can be easily disassembled and maintenance such as cleaning can be easily performed.

  In the above embodiment, the case where wood chips are processed as an object to be processed has been described. However, the object to be processed may be, for example, garbage, paper, cloth, plastic pieces, etc. other than wood chips, or a mixture thereof. It may be.

  Moreover, in the said embodiment, although the crusher 1 was a horizontal axis | shaft type in which the rotating shaft faced the horizontal direction, the vertical axis | shaft type in which the rotating shaft faced the perpendicular direction may be sufficient. Moreover, you may form the crushing member of a crusher with tools other than a hammer, for example. Moreover, the form of the hammer of a crushing member is not restricted to what has a rod member and a hammer head, For example, a gear-like thing and a blade-like thing may be sufficient. Moreover, the temperature of the heated air supplied to the crusher 1 by the hot air furnace 4 is not limited to 50 to 90 ° C., for example, when the object to be processed contains low density polyethylene, it is set to about 60 ° C., or When the object to be treated is sludge, it can be appropriately changed depending on the object to be treated, such as setting to about 90 ° C.

  Further, the dryers 21 and 21 may be provided with a heater for auxiliary heating on the outer plate 22. By providing the auxiliary heater, it is possible to effectively dry the object to be processed having a high water content. Moreover, you may improve drying efficiency by covering the outer surface of the plate 22 and the partition plate 23 with a heat insulating material.

  As is clear from the above, in the airflow type swirl dryer with a crusher of the present invention, the crusher is fixed to the rotation axis provided in a cylindrical casing, a rotary shaft rotatably provided in the casing. A crushing member having a crushing member for crushing the object to be processed, a supply port formed on an end surface of the cylindrical casing, to which the object to be processed is supplied together with dry air, and the cylindrical casing A workpiece to be crushed by the rotary crushing unit and a discharge port for discharging the dry air, and a dryer is disposed between the pair of plates and the pair of plates. A partition plate that is bent and arranged in a spiral shape to form a spiral airflow path, an outer peripheral opening that is formed in the plate or the partition plate and communicates with an outer peripheral end of the spiral airflow path, and is formed in the plate. , Communicating with the central end of the spiral airflow passage A workpiece to be processed and dry air discharged from one of the outer peripheral opening and the central opening, and the air flow passage from the other of the outer peripheral opening and the central opening. Since the object to be processed dried with the dry air is discharged while passing through, the object to be processed inside the rotary crushing part and the casing even when the water content of the object to be processed is relatively large Can be prevented, and a high-efficiency air-flow swirl dryer with a disintegrator can be obtained. Moreover, since the said dryer can be reduced in size effectively, size reduction of the airflow type | formula swirl dryer with a crusher can be performed effectively.

  The airflow type swirl dryer with a crusher according to one embodiment includes a heater that is connected to a supply port of the crusher and generates heated air as dry air, so that an object to be treated is attached to the inside of the crusher. It can prevent effectively and can dry a processed material effectively in a drier.

  An air-flow type swirl dryer with a crusher according to an embodiment includes a plurality of dryers, and a plate located between adjacent dryers is formed by a single shared plate, and the outer peripheral openings of adjacent dryers Since the central openings are alternately communicated sequentially, a small dryer can be obtained with a small number of parts. Further, since the drying capacity can be easily set by setting the number of partition plates, an airflow type swirl dryer with a crusher corresponding to various objects to be treated can be configured.

  The airflow swirl dryer with a crusher according to an embodiment includes a cyclone separator connected to the other of the outer peripheral opening and the central opening of the dryer, and a suction blower that sucks air from the cyclone separator. The material to be processed can be conveyed from the crusher to the cyclone separator through the dryer.

  The airflow swirl dryer with crusher of one embodiment is connected to the downstream side of the suction blower and includes a reflux path for returning a part of the air sucked from the cyclone separator to the heater. The air flow circulating through the dryer and cyclone separator can be easily formed, and the dry air can be efficiently flowed to the crusher and dryer, and from the crusher to the cyclone separator through the dryer. A workpiece can be conveyed.

It is the schematic diagram which showed the airflow type | formula rotary dryer with a crusher of embodiment of this invention. It is a longitudinal cross-sectional view which shows a mode that the crusher was cut | disconnected along the horizontal rotating shaft. It is a cross-sectional view which shows a mode that the crusher was cut | disconnected in the direction orthogonal to a horizontal rotating shaft. It is the perspective view which showed the structure of the drying unit typically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crusher 2 Drying unit 4 Hot stove 5 Constant supply machine 7 Cyclone separator 8 Suction blower 9 Dust collector 11 Casing 12 Horizontal rotating shaft 13 Motor 14 Frame 15 Rotating hammer 16 Fixed hammer 17 Inlet duct 18 Outlet duct 21 Dryer 22 Plate 23 Partition Plate 24 Airflow passage 26 Supply port 27 Discharge port 28 Through hole 41 Burner 42 Combustion chamber 43 Ventilation path 51 Storage tank 52 Rotary seal valve 71 Cylindrical part 72 Conical part 73 Rotary seal valve 75 Silo 81 Reflux path

Claims (5)

A dryer suitable for drying lightweight solids typified by pulverized waste plastic and wood chips, a crusher that crushes the object to be treated, and a drier that dries the object to be crushed by this crusher. The crusher includes a cylindrical casing, a rotating shaft that is rotatably provided in the casing, and a crushing member that is fixed to the rotating shaft and crushes the workpiece. A rotating crushing unit;
An inlet duct that is formed on an end surface of the cylindrical casing and is supplied with an object to be processed together with dry air, and an object to be processed that is formed on the peripheral surface of the cylindrical casing and is crushed by the rotary crushing unit. And an outlet duct for discharging the dry air,
The dryer is arranged in a spiral between the pair of plates, the pair of plates, and forms a spiral airflow passage, and is formed in the plate or the partition plate, the spiral airflow passage. An outer peripheral opening that communicates with the outer peripheral side end portion, and a central opening that is formed in the plate and communicates with the central end portion of the spiral airflow passage. The processing object and dry air discharged from the discharge port of the crusher are supplied, and the processing object dried with the dry air is discharged from the other of the outer peripheral opening and the central opening while passing through the air flow passage. And
The crusher accommodates a plurality of rotary hammers 15 as crushing members in a horizontal cylindrical casing 11, and the rotary hammers 15 are rotationally driven around a horizontal rotary shaft 12 by a motor 13. The rotary hammer 15 that protrudes substantially parallel to the horizontal rotation shaft 12 so as to draw a plurality of concentric circles on the annular frame 14 that is fixed by the fixing member G and that is arranged in the minimum concentric circle is the inlet duct. The rotary hammer 15 arranged around the opening 17 and arranged in the maximum concentric circle is arranged close to the opening of the outlet duct, while facing the end surface of the casing 11 facing the tip of the rotary hammer 15. Te, the the rotary hammer 15 disposed at the minimum concentric and between the rotary hammer 15 disposed in the second concentric, the rotating hammers 15 and before being disposed at a maximum concentric Fixed hammer 16 at least protrudes is fixed between the rotating hammers 15 that are disposed in a circle, the fixed hammer 16, so as to draw a sequence shape concentric with the circle of rotation hammer 15 in transverse cross-section, and, The rotary hammer 15 and the fixed hammer 16 are both arranged so as to be positioned between the rotary hammers 15 in the radial direction, and each has a shape in which a hammer head having a diameter larger than that of the bar member is connected to the tip of the bar member. An inlet duct 17 is provided on the end face of the casing 11 on the side where the fixed hammer 16 is fixed, at a position facing the horizontal rotary shaft 12, and through the inlet duct 17 as dry air from the hot stove 4. While heated air is supplied and the object to be processed is supplied from the quantitative supply machine 5, on the upper end of the casing 11 of the crusher 1. And outlet duct 18 is provided, from the outlet duct 18, disintegrated object to be processed airflow swirling dryer with pulverizer, characterized in that it is discharged toward the drying unit 2. The hot air furnace 4 includes a burner 41, a combustion chamber 42 from which a combustion flame is discharged from the burner 41, and a ventilation path 43 that surrounds the outside of the combustion chamber 42, and is downstream of the combustion chamber 42 and the ventilation path 43. The airflow type swirl dryer with a crusher according to claim 1, wherein the sides merge and communicate with the inlet duct 17 of the crusher 1. Including a plurality of the dryers,
The plate located between adjacent dryers is formed by a single shared plate,
The air flow type swirl dryer with a crusher according to claim 1, wherein the outer peripheral openings and the central openings of adjacent dryers are alternately communicated with each other. The airflow type swirl drying with a crusher according to claim 1, further comprising: a cyclone separator connected to the other of the outer peripheral opening and the central opening of the dryer; and a suction blower for sucking air from the cyclone separator. Machine. The airflow type swirl dryer with a crusher according to claim 3, further comprising a reflux path connected to the downstream side of the suction blower and returning a part of the air sucked from the cyclone separator to the heater.

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