JP2017196583A - Recovery device, drier, and recovery method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology capable of easily removing recovered dust and liquid components in a recovery device for separating and recovering dust and liquid components contained in gas.SOLUTION: A recovery device 40 is used together with air current generation means. The recovery device 40 comprises a separation unit 47 connected to the air current generation means and separating dust and a liquid component contained in gas. The separation unit 47 comprises an attachment portion 46 in its lower part. The attachment portion 46 allows attachment of a disposable recovery container 45 for recovering dust and liquid components. Since the recovery container 45 is disposable, it can be wholly replaced with new one when recovering the dust and liquid component collected in the recovery container 45. Thus, there is no need to take out the dust and liquid component in the recovery container 45 from inside the recovery container 45. Thus, labor of maintenance of the recovery device 40 can be reduced.SELECTED DRAWING: Figure 2

Description

  The present invention is used with an air flow generating means, and separates and collects dust and / or liquid components contained in a gas, a drying device having the collection device, and dusts and / or liquids contained in a gas. The present invention relates to a recovery method for separating and recovering components.

  Conventionally, various dust collectors are known as recovery devices that separate and recover dust contained in a gas. A conventional recovery device is disclosed in, for example, Patent Document 1.

  The recovery device described in Patent Document 1 is a so-called cyclone type dust collector. The cyclone type dust collector separates dust and gas contained in the gas using centrifugal force in a vertically extending cylindrical and conical portion (separating portion), and discharges the separated dust downward. In the dust collector described in Patent Document 1, separated dust is collected in a dust collection chamber (collection container) (paragraph 0004, FIG. 11).

JP 2010-17675 A

  When the recovery device is used, dust separated from the gas accumulates in the recovery container. For this reason, it is necessary to remove the dust accumulated in the collection container. When dust is removed from the collection container, if the collected dust is fine, there is a possibility that problems such as dust rising may occur.

  In addition, for example, in a cyclone type dust collector, when fine particles of a liquid component are contained in a gas, not only dust but also a liquid component may be separated and recovered. When the liquid component is a highly viscous liquid such as an oil component, when removing dust and the liquid from the collection container, it may be difficult to remove the liquid attached to the collection container.

  An object of the present invention is to provide a technique capable of easily removing collected dust and / or liquid components in a collecting apparatus that separates and collects dust and / or liquid components contained in a gas.

  In order to solve the above-mentioned problem, the first invention of the present application is a recovery device that is used together with an airflow generation means and separates and collects dust and / or liquid components contained in the gas, and is connected to the airflow generation means. A separation unit that separates the dust and / or the liquid component contained in the gas, and the separation unit collects the dust and / or the liquid component in a lower part of the separation unit. It has an attachment part which can attach a container.

  2nd invention of this application is a collection | recovery apparatus of 1st invention, Comprising: It further has the said collection | recovery container attached to the said attaching part of the said separation part.

  A third invention of the present application is the collection device of the first invention or the second invention, wherein the collection container is translucent or transparent.

  A fourth invention of the present application is the recovery apparatus according to any one of the first to third inventions, wherein the recovery container has pressure resistance against an internal pressure of -50 kPa or more and +50 kPa or less.

  A fifth invention of the present application is the collection device according to any one of the first to fourth inventions, wherein the attachment portion has a first thread groove, and the collection container has a second thread groove in its opening. And the first screw groove and the second screw groove engage with each other.

  A sixth invention of the present application is the collection device according to any one of the first to fifth inventions, wherein the separation unit is an opening / closing unit capable of switching between air flow communication and blocking at an upper part or a lower part of the attachment part. It has further.

  A seventh invention of the present application is the collection device according to any one of the first to sixth inventions, wherein the separation portion has a cylindrical shape extending vertically and having a reduced diameter portion that decreases in diameter as it goes downward. A tubular portion; and an upper portion of the tubular portion; an intake pipe that supplies gas in a tangential direction of the tubular portion; and an upper end that is disposed above the tubular portion, and a lower end that is disposed above the tubular portion And an exhaust pipe disposed inside the cylindrical portion.

  An eighth invention of the present application is the recovery device according to the seventh invention, wherein a supply pipe that supplies gas to the separation unit, and a cooling means that is interposed in the supply pipe and reduces the temperature of the gas in the supply pipe And.

  A ninth invention of the present application is the recovery device according to the seventh invention, further comprising a supply pipe for supplying a gas to the separation unit, wherein the supply pipe is supplied from the gas in the supply pipe to the inside of the supply pipe. Also has a gas inlet for introducing a low temperature gas.

  A tenth invention of the present application is a drying device for drying powder bodies of plastic molding material, and has a recovery device according to any one of the first to ninth inventions, an air supply port and an exhaust port, A drying hopper that stores powder particles therein, a circulation line that connects the exhaust port to the air supply port, and an air flow that generates an air flow from the exhaust port to the air supply port in the circulation line Generating circuit, heating means for heating the gas in the circulation pipe, and a demister for separating and removing fine particles of liquid entrained in the gas in the circulation pipe from the gas, and the circulation pipe The recovery device, the demister, the airflow generation unit, and the heating unit are sequentially inserted in the path from the exhaust port to the air supply port.

  An eleventh invention of the present application is a recovery method for separating and collecting dust and / or liquid components contained in a gas, and a) separation for separating the dust and / or liquid components contained in the gas. Attaching a disposable recovery container having an internal space for recovering the dust and / or the liquid component to the lower part of the part; b) supplying the gas to the separation part, and the dust contained in the gas And / or a step of separating the liquid component; and c) a step of removing the collection container from the separation unit and discarding it together with the dust and / or the liquid component collected inside.

  According to the first to eleventh inventions of the present application, when collecting dust and / or liquid components accumulated in the collection container, the collection container can be replaced with a new one. Therefore, it is not necessary to take out the dust and / or liquid component accumulated in the collection container from the collection container. Thereby, the maintenance labor of the collection device can be reduced.

It is the schematic which showed the structure of the drying apparatus which concerns on 1st Embodiment. It is sectional drawing which showed the structure of the cyclone which concerns on 1st Embodiment. It is sectional drawing which showed the structure of the demister which concerns on 1st Embodiment. It is the flowchart which showed the flow at the time of use of the collection | recovery apparatus which concerns on 1st Embodiment. It is the schematic which showed the structure of the drying apparatus which concerns on one modification. It is the schematic which showed the structure of the drying apparatus which concerns on another modification. It is sectional drawing which showed the structure of the cyclone and demister which concern on another modification.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

<1. First Embodiment>
<1-1. Configuration of drying device>
FIG. 1 is a schematic view showing the configuration of a drying apparatus 1 according to the first embodiment of the present invention. The drying device 1 is a device that heats and drys resin pellets 9 that are powder bodies of plastic molding material, and supplies the dried resin pellets 9 to subsequent devices such as an injection molding machine. As shown in FIG. 1, the drying device 1 of the present embodiment includes a drying hopper 20, a circulation pipe 30, a cyclone 40, a demister 50, a blower 60, an adsorber 70, a heater 80, and a control unit 10.

  The drying hopper 20 is a container that stores the resin pellets 9 therein. The drying hopper 20 includes a substantially cylindrical side wall 201, a funnel-shaped bottom portion 202 that gradually converges from the lower end portion of the side wall 201, and a top plate portion 203 that covers the opening at the top of the side wall 201. A space for storing the resin pellets 9 and drying them by heating is provided inside the drying hopper 20.

  In the upper part of the drying hopper 20, a charging port 204 for charging the resin pellet 9 into the drying hopper 20 is provided. The input port 204 of this embodiment is provided in the top plate part 203 of the drying hopper 20. However, the insertion port 204 may be provided in the side wall 201 as long as it is an upper part of the drying hopper 20. A discharge port 205 for discharging the resin pellets 9 downward from the dry hopper 20 is provided at the lower portion of the dry hopper 20.

  Further, an exhaust port 21 for exhausting the gas in the dry hopper 20 is provided at the upper part of the side wall 201 of the dry hopper 20. The exhaust port 21 is provided with a pellet filter formed of punching metal or the like in order to prevent the resin pellets 9 in the dry hopper 20 from being discharged from the exhaust port 21 together with the gas. In the present embodiment, the exhaust port 21 is provided in the side wall 201, but the exhaust port 21 may be provided in the top plate part 203.

  An air supply port 22 for supplying hot air to the inside of the drying hopper 20 is provided inside the drying hopper 20. The air supply port 22 supplies hot air downward toward the bottom portion 202.

  The circulation line 30 is a piping system that circulates gas in order to supply hot air for drying into the drying hopper 20. The circulation pipe 30 is a pipe connecting the exhaust port 21 to the air supply port 22. One end of the circulation line 30 is connected to the exhaust port 21. The other end of the circulation line 30 passes through the side wall 201 of the drying hopper 20 and is connected to an air supply port 22 disposed inside the drying hopper 20. Note that the other end of the circulation conduit 30 may pass through the top plate 203 of the drying hopper 20 and be connected to the air supply port 22.

  A cyclone 40, a demister 50, a blower 60, an adsorber 70, and a heater 80 are inserted in the circulation line 30 from the exhaust port 21 toward the air supply port 22 in this order.

  The cyclone 40 is a recovery device that is connected to the blower 60 via the circulation pipe 30 and separates and collects dust and / or liquid components contained in the gas supplied to the cyclone 40. FIG. 2 is a cross-sectional view showing the configuration of the cyclone 40. As shown in FIG. 2, the cyclone 40 includes a cylindrical portion 41, a lid portion 42, an intake pipe 43, an exhaust pipe 44, and a collection container 45.

  The tubular portion 41 is a tubular portion that extends vertically. The cylindrical portion 41 includes a cylindrical cylindrical portion 411 and a reduced diameter portion 412 that decreases in diameter from the lower end portion of the cylindrical portion 411 toward the lower side. The tubular portion 41 of the present embodiment is formed of a metal material having a high thermal conductivity. The upper opening of the cylindrical portion 41 is covered with a lid portion 42. A collection container 45 is attached to the opening at the bottom of the cylindrical portion 41. The attachment of the collection container 45 will be described later.

  The intake pipe 43 is a pipe for supplying gas in the tangential direction of the tubular portion 41 at the upper portion of the tubular portion 41. The intake pipe 43 of this embodiment is connected to the cylindrical portion 411 and supplies gas in the tangential direction of the inner peripheral surface of the cylindrical portion 411.

  The exhaust pipe 44 is a pipe that penetrates the lid portion 42 and extends vertically. The upper end portion of the exhaust pipe 44 is disposed above the cylindrical portion 41. A lower end portion of the exhaust pipe 44 is disposed inside the cylindrical portion 41. In the present embodiment, the lower end portion of the exhaust pipe 44 is disposed above the lower end portion of the cylindrical portion 411.

  When the gas is supplied from the intake pipe 43 to the inside of the cyclone 40 by being connected to the air flow generating means such as the blower 60, the gas flows into the cylindrical portion 41 as shown by the solid line arrow in FIG. After descending while spirally turning along the inner surface, it rises through the vicinity of the center of the tubular portion 41 and is discharged out of the cyclone 40 through the exhaust pipe 44.

  When the gas supplied to the cyclone 40 is higher than the temperature of the space where the drying apparatus 1 is installed (hereinafter referred to as “external space”), the gas swirls along the inner surface of the cylindrical portion 41, thereby causing the cyclone. Heat is transferred from the gas in 40 to the external space via the cylindrical portion 41. Therefore, the gas in the cyclone 40 is cooled. By being cooled, volatile components and water vapor contained in the gas swirling in the cyclone 40 are liquefied, and liquid component fine particles are generated in the gas.

  On the other hand, while the gas swirls along the inner surface of the cylindrical portion 41, the relatively large particles among the fine particles of the dust and liquid component contained in the gas are moved outside the gas flow by the action of the centrifugal force. get together. By gathering outside, the liquid component particulates gather together, or the liquid component particulates and dust gather together to form droplets. Then, as indicated by broken line arrows in FIG. 2, when the gas changes its traveling direction from below to above, the liquid droplets containing dust and liquid components are continuously applied to the inner surface of the cylindrical portion 41 by the action of gravity. Rotate along and descend.

  In this way, the gas is separated from some of the dust and liquid components. Part of the dust and liquid components separated from the gas is accumulated in the collection container 45 through the opening at the bottom of the cylindrical portion 41. On the other hand, the remaining part of the liquid component fine particles remaining in the gas without forming droplets is discharged to the outside of the cyclone 40 through the exhaust pipe 44 together with the gas.

  The demister 50 separates and removes liquid fine particles (mist) contained in the gas in the circulation pipe 30 from the gas. FIG. 3 is a cross-sectional view showing the configuration of the demister 50. As illustrated in FIG. 3, the demister 50 includes a housing 51, a wire mesh 52, an inflow port 53, an outflow port 54, and a liquid discharge port 55.

  The casing 51 forms a gas flow path from an inflow port 53 that is a lower opening to an outflow port 54 that is an upper opening. Moreover, the housing | casing 51 accommodates the wire mesh 52 in the said flow path substantially perpendicularly.

  The wire mesh 52 is a mesh portion obtained by laminating a cloth in which metal wires (wire members) having a thin wire diameter are arranged in a net shape. The wire mesh 52 is disposed substantially horizontally. Although the cloth formed by the linear member is used for the mesh portion of the present embodiment, a cloth formed by another mesh structure such as a punching metal may be used.

  The inflow port 53 is provided on the side portion of the casing 51 below the wire mesh 52. The outflow port 54 is provided above the case 51 above the wire mesh 52. As a result, the gas supplied from the inlet 53 into the demister 50 passes through the wire mesh 52 toward the outlet 54. The liquid discharge port 55 is provided at the bottom of the housing 51. The liquid discharge port 55 is provided with an opening / closing valve 56.

  When the gas supplied from the inlet 53 passes through the wire mesh 52, the liquid fine particles contained in the gas inertially collide with the surface of the filament constituting the wire mesh 52, so that the liquid fine particles are wetted by the metal wire. It collects and grows due to the nature and capillarity in the gaps between metal wires. When the droplet formed in this way becomes a predetermined size or larger, it drops from the wire mesh 52 downward. The dropped liquid droplet is accumulated at the bottom of the housing 51. When the on-off valve 56 is opened, the liquid accumulated at the bottom of the casing 51 can be discharged to the outside of the demister 50.

  The blower 60 is an air flow generating means that generates an air flow from the exhaust port 21 toward the air supply port 22 in the circulation pipe 30. The blower 60 rotates the fan according to the drive signal from the control unit 10. Thereby, the airflow according to rotation of a fan generate | occur | produces. Instead of the blower 60, airflow generating means having another configuration may be used.

  The adsorber 70 is a moisture absorption unit that adsorbs moisture contained in the gas. The adsorber 70 according to the present embodiment includes a moisture absorbing member formed of a honeycomb-shaped ceramic body in which a plurality of through holes are formed along the gas blowing direction. This ceramic body is composed of a composition containing zeolite that can adsorb moisture. Further, the adsorber 70 is not limited to the above-described method, and other types of adsorbers may be used. In addition, although the drying apparatus 1 of this embodiment is a dehumidification drying apparatus which has the adsorption device 70, the drying apparatus of this invention may be a hot air drying apparatus which does not have the adsorption device 70.

  In the present embodiment, the adsorber 70 is disposed on the downstream side of the demister 50 in the circulation conduit 30. Thereby, it is suppressed that a volatile component aggregates and adheres to the adsorption device 70. FIG. Further, the adsorber 70 is disposed on the upstream side of the heater 80. Thereby, the gas before being cooled by the cyclone 40 and heated by the heater 80 is supplied to the adsorber 70. Since the temperature of the gas supplied to the adsorber 70 is low, the dehumidification efficiency in the adsorber 70 is improved.

  The heater 80 is a heating unit that heats the gas in the circulation conduit 30. The heater 80 heats the gas passing through the circulation conduit 30 in accordance with a drive signal from the control unit 10. The heater 80 of the present embodiment is an electrothermal heating device, but other types of heating means may be used.

  The control unit 10 controls the operation of each unit of the drying device 1. The control unit 10 is electrically connected to the blower 60 and the heater 80, respectively. The control unit 10 includes an arithmetic processing unit such as a CPU and a computer having a memory. In addition, the control part 10 may be comprised with the electronic circuit board. The control unit 10 controls the operation of each unit described above based on a preset program or an external input signal. Thereby, the heat drying process of the resin pellet 9 in the drying apparatus 1 proceeds.

  When performing the heat drying process of the resin pellet 9 by the drying apparatus 1, the control unit 10 drives the blower 60 and the heater 80. When the blower 60 is driven, an air flow from the exhaust port 21 toward the air supply port 22 is generated in the circulation pipe 30. The gas sucked into the circulation line 30 from the drying hopper 20 through the exhaust port 21 includes moisture evaporated from the resin pellet 9, fine dust, and volatile components such as additive components volatilized from the resin pellet 9. It is included.

  From the gas sucked into the circulation line 30 from the drying hopper 20, first, fine dust and a part of the liquid component are removed in the cyclone 40. At the same time, the gas is cooled in the cyclone 40. Thereby, the volatile component in gas is liquefied and it becomes the fine particle of a liquid component. Next, the fine particles of the liquid component remaining in the gas are removed by passing through the demister 50. Subsequently, the gas that has passed through the demister 50 passes through the blower 60, and after the moisture is further removed in the adsorber 70, it is heated by the heater 80 to become hot air. Then, the hot air is blown out from the air supply opening 22 into the drying hopper 20.

The hot air blown out from the air supply port 22 is diffused into the drying hopper 20 through a gap between the resin pellets 9 stored in the drying hopper 20. Thereby, the resin pellet 9 is heated, moisture is evaporated from the resin pellet 9, and the resin pellet 9 is dried. That is, the gas diffused into the dry hopper 20 absorbs moisture from the resin pellet 9. The gas that has absorbed moisture is again sucked into the circulation line 30 through the exhaust port 21.

  In the drying apparatus 1, a cyclone 40 that separates and removes dust from the gas is disposed on the upstream side of the demister 50. Thereby, it can suppress that dust adheres to the wire mesh 52 of the demister 50, and the flow-path resistance of the wire mesh 52 falls.

  In the drying apparatus 1, a cyclone 40 as a cooling unit is provided on the upstream side of the demister 50 that separates and removes liquid component fine particles from the gas. By cooling with the cyclone 40 and liquefying volatile components and water vapor, these components can be efficiently separated and removed in the demister 50.

  Since the cyclone 40 and the demister 50 are arranged on the most upstream side of the circulation line 30, volatile components such as additive components are contained in the circulation line 30 including the blower 60, the adsorber 70 and the heater 80. Solidification or liquefaction is prevented from adhering. As a result, problems such as failure of the blower 60 and the heater 80 and degradation of the performance of the adsorber 70 due to the adhesion are suppressed.

  Here, when the cooling means provided on the upstream side of the demister 50 can significantly cool to a temperature lower than the temperature of the external space, separation and removal of volatile components and moisture in the cooling means and the demister 50 are performed. Can be performed more efficiently. However, in this case, in order to sufficiently increase the temperature of the hot air supplied to the drying hopper 20, there arises a problem that the amount of energy consumed for raising the temperature of the gas in the heater 80 increases.

  In the present embodiment, a cyclone 40 that can cool only to a temperature equal to or higher than the temperature of the external space is used as the cooling means provided on the upstream side of the demister 50. By using such a cyclone 40 as a cooling means, an increase in energy consumption in the heater 80 can be suppressed. The cyclone 40 itself is a cooling means that does not consume energy. For this reason, by using the cyclone 40 as a cooling means, the removal efficiency of the volatile component in the demister 50 can be improved while suppressing the energy consumption in the drying apparatus 1.

  Moreover, in the cyclone 40, when the particle | grains of the liquid component contained in gas become large with gas cooling, the said liquid component can be isolate | separated and removed by the effect | action of a centrifugal force. For this reason, not only the demister 50 but also the cyclone 40 can separate and remove volatile components in the gas. Therefore, the removal efficiency of the volatile component volatilized from the resin pellet 9 can be further improved.

  In the present embodiment, an inert gas or dry air is used as a gas that fills the inside of the drying hopper 20 and the circulation pipe 30 and is used for drying the resin pellets 9. In the drying apparatus 1 of the present embodiment, when the input port 204 and the discharge port 205 of the drying hopper 20 are closed, a closed space is configured by the drying hopper 20 and the circulation conduit 30. For this reason, it can suppress that the gas with which the inside of the drying hopper 20 and the circulation pipe line 30 leaks to external space, and wastes these gases arise.

<1-2. About collection container of collection device>
Next, the collection container 45 in the cyclone 40 will be described with reference to FIG.

  As described above, the collection container 45 is attached to the opening below the cylindrical portion 41. That is, the cylindrical part 41 has an attachment part 46 to which the collection container 45 can be attached at the lower part. Here, the cylindrical part 41, the intake pipe 42 and the exhaust pipe 43 are connected to a blower 60 which is an air flow generating means, and constitute a separation part 47 which separates dust and / or liquid components contained in the gas. . For this reason, the separation part 47 constituted by the tubular part 41, the intake pipe 42 and the exhaust pipe 43 has an attachment part 46 at its lower part. Hereinafter, “dust and / or liquid component” is expressed as “dust and liquid component”.

  Conventionally, a recovery container made of a metal such as SUS is generally used for this type of recovery device. Since the conventional collection container is not disposable, when removing dust from the inside, it is necessary to remove the dust accumulated in the collection container. For this reason, when the collected dust is fine, there is a possibility that problems such as dust rising may occur.

  On the other hand, the collection container 45 of the present embodiment is a disposable container that collects dust and liquid components separated in the separation unit 47 of the cyclone 40. When the collection container 45 is a disposable container, when collecting dust and liquid components accumulated in the collection container 45, the collection container 45 can be replaced with a new one. Accordingly, there is no need to take out dust and liquid components accumulated in the collection container 45 from the collection container 45. Thereby, the maintenance labor of the cyclone 40 can be reduced.

  Moreover, in this embodiment, in the cyclone 40 which is a collection | recovery apparatus, not only dust but the liquid component which the additive component, the water | moisture content, etc. liquefied is collect | recovered. For this reason, the liquid containing the oil component with high viscosity is recovered in the recovery container 45. When a conventional collection container is used for such a cyclone 40, when removing dust and liquid components accumulated in the collection container, it becomes difficult to remove the liquid components due to adhesion inside the collection container. There is. On the other hand, in this embodiment, it is not necessary to remove the liquid component adhering to the inside by using the disposable collection container 45.

  The collection container 45 of the present embodiment is a screw cap bottle formed of high density polyethylene (PE). The collection container 45 may be formed of other materials such as polypropylene (PP).

  The attachment portion 46 provided at the lower portion of the tubular portion 41 has a first screw groove 461 on the inner peripheral surface thereof. On the other hand, the collection container 45 has a second thread groove 451 on the outer peripheral surface of the neck that forms the upper opening. The collection container 45 is attached to the separation unit 47 by the engagement of the first screw groove 461 and the second screw groove 451. The first screw groove 461 has the same diameter and the same pitch as the screw groove of the cap attached to the used collection container 45.

  Thus, attachment work becomes easy by attaching collection container 45 to separation part 47 by screw structure. Moreover, it is easy to ensure the airtightness in the collection container 45 by attachment by a screw structure. For this reason, the airtightness of the closed space constituted by the drying hopper 20 and the circulation conduit 30 can be ensured.

  The collection container 45 is preferably translucent or transparent. In other words, it is preferable that the collection container 45 has such light transmittance that the amount of the collected product stored inside can be visually recognized from the outside. In this way, the amount of the collected material stored in the collection container 45 can be visually confirmed. Thereby, it is easy to understand the timing of replacing the collection container 45. Note that the entire collection container 45 does not necessarily have to be translucent or transparent. The collection container 45 may have a translucent or transparent window that extends vertically.

  Moreover, it is preferable that the collection container 45 has pressure resistance against an internal pressure of −50 kPa or more and +50 kPa or less. When the cyclone 40 is disposed on the conveyance path for suction conveyance, a negative pressure of about −30 kPa to −20 kPa is applied to the collection container 45. If the collection container 45 has pressure resistance, even if it is a case where the cyclone 40 is arrange | positioned on the conveyance path | route of the suction conveyance of a granular material, it is suppressed that the collection container 45 deform | transforms.

  Next, a procedure for using the cyclone 40 will be described with reference to FIG. FIG. 4 is a flowchart showing a flow when the cyclone 40 is used.

  When the cyclone 40 is used, first, the collection container 45 is attached to the lower part of the separation unit 47 (step S1). Next, the blower 60 is driven. Thereby, gas is supplied to the separation part 47 of the cyclone 40, and the dust and the liquid component contained in the said gas are isolate | separated (step S2).

  When the collection of dust and liquid components in the cyclone 40 is completed, the drive of the blower 60 is stopped and the supply of gas to the cyclone 40 is stopped (step S3). Thereafter, the collection container 45 is removed from the separation unit 47. Thereafter, a cap having a thread groove engageable with the second thread groove 362 is attached to the collection container 45. Then, the collection container 45 is discarded together with the dust and liquid components collected inside the collection container 45 (step S4).

<2. Modification>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

  FIG. 5 is a schematic diagram illustrating a configuration of a drying apparatus 1A according to a modification. In this drying apparatus 1A, the circulation conduit 30A has a gas intake port 31A and a gas exhaust port 32A. The gas intake port 31A is disposed between the exhaust port 21A and the cyclone 40A and includes a first on-off valve 311A. The gas discharge port 32A is disposed between the blower 60A and the adsorber 70A and has a second on-off valve 321A. When the first on-off valve 311A is opened, a gas having a temperature lower than that of the gas in the circulation line 30A is introduced into the circulation line 30A through the gas intake port 31A. That is, the gas intake port 31A is inserted in the circulation line 30 which is a supply pipe that supplies gas to the separation part of the cyclone 40A. On the other hand, when the second on-off valve 321A is opened, part of the gas in the circulation line 30A is discharged to the outside.

  In the example of FIG. 5, the drying apparatus 1 </ b> A includes a closed circulation mode in which a drying hopper 20 </ b> A and a circulation line 30 </ b> A form a closed circulation path, and a gas intake mode in which gas is taken into the circulation line 30 </ b> A from the outside. Switching is possible. In the closed circulation mode, both the first on-off valve 311A and the second on-off valve 321A are closed. Thereby, a closed circuit is formed by the drying hopper 20A and the circuit 30A.

  In the gas intake mode, the first on-off valve 311A and the second on-off valve 321A are simultaneously opened while the drying process by the drying apparatus 1A is in progress. Thereby, on the downstream side of the drying hopper 20A and the upstream side of the cyclone 40A, gas is introduced from the gas intake port 31A into the circulation conduit 30A, and on the downstream side of the blower 60A and the upstream side of the adsorber 60A. A part of the gas in the circulation line 30A is discharged from the gas discharge port 32A. For this reason, the mixed gas obtained by mixing the gas discharged from the drying hopper 20A with the gas having a low temperature introduced from the gas intake port 31A is supplied to the cyclone 40A and the demister 50A. By taking in a gas having a lower temperature than the gas in the circulation line 30A on the upstream side of the gas intake port 31A from the gas intake port 31A, this mixed gas is more than the gas discharged from the drying hopper 20A. The temperature goes down. That is, the gas intake port 31 </ b> A serves as a cooling unit that lowers the temperature of the gas in the circulation pipe 30.

  If it does in this way, the temperature of the gas supplied to cyclone 40A and demister 50A can be made low. Therefore, the removal efficiency of volatile components in the cyclone 40A and the demister 50A can be further improved.

  In this drying apparatus 1A, air contained in the external space is used as the gas filled in the drying hopper 20A and the circulation pipe 30A and used for drying the resin pellets 9A. For this reason, the air contained in external space is used as gas introduced into the inside of the circulation conduit 30A via the gas intake port 31A.

  An inert gas such as nitrogen gas or dry air may be used as the gas filled in the drying hopper 20A and the circulation pipe 30A and used for drying the resin pellet 9A. In this case, the gas introduced into the circulation line 30A via the gas intake port 31A may be the same inert gas or dry air as the gas filled in the drying hopper 20A and the circulation line 30A. preferable.

  When the gas introduced from the gas intake port 31A is an inert gas or dry air having a lower humidity than the gas discharged from the dry hopper 20A, in the gas intake mode, the gas discharged from the dry hopper 20A is A mixed gas obtained by mixing a low-humidity gas introduced from the intake port 31A is supplied. Thereby, the humidity of the gas supplied to the adsorber 70A is lower than the humidity of the gas discharged from the drying hopper 20A. Thereby, since the amount of water adsorbed by the adsorber 70A can be reduced, the labor of maintenance of the adsorber 70A can be reduced. Moreover, since the humidity of the gas supplied to the drying hopper 20A can be reduced, the drying efficiency of the resin pellets 9A in the drying hopper 20A can be improved.

  FIG. 6 is a schematic diagram illustrating a configuration of a drying apparatus 1B according to another modification. FIG. 7 is a cross-sectional view showing the configuration of the cyclone 40B and the demister 50B used in the drying apparatus 1B. In this drying apparatus 1B, the cyclone 40B and the demister 50B are directly connected.

  In the demister 50B of the example of FIGS. 6 and 7, the inflow port 53B is provided at the bottom of the casing 51B. The lower end of the inflow port 53B is directly connected to the upper end of the exhaust pipe 44B of the cyclone 40B. For this reason, when the drying apparatus 1B is driven, the gas discharged from the inside of the cyclone 40B through the exhaust pipe 44B flows into the housing 51B of the demister 50B through the inflow port 53B. And the flow of the gas which goes to the outflow port 54B provided in the upper part from the inflow port 53B provided in the bottom arises in the inside of the housing | casing 51B.

  In this demister 50 </ b> B, the liquid component collected in the wire mesh 52 </ b> B falls as a droplet to the bottom of the casing 51. And it falls to the collection container 45B through the inside of the inlet 53B, the exhaust pipe 44B of the cyclone 40B, and the cylindrical portion 41B. With this configuration, the dust and liquid components separated and removed in the cyclone 40B and the liquid components separated and removed in the demister 50B are accumulated in the collection container 45B of the cyclone 40B.

  If the cyclone 40B and the demister 50B are connected together as in the example of FIGS. 6 and 7, the physique of the drying apparatus 1B can be reduced.

  Moreover, in said embodiment and modification, although the isolation | separation part and collection | recovery container of the collection | recovery apparatus were engaged by the screw structure, this invention is not limited to this. The separation unit and the recovery unit may be fixed using a fixing tool such as a bolt or a catch clip.

  Moreover, in said collection | recovery apparatus, although the isolation | separation part and collection | recovery container of the collection | recovery apparatus were connected via the attachment part, this invention is not limited to this. The separation part of the recovery device may further include an opening / closing part capable of switching between communication and blocking of the airflow at the upper part or the lower part of the attachment part. If it does in that way, if a closing part is closed, a collection container will be removable, without stopping supply of gas to a collection device. Therefore, the recovery container can be exchanged during use of the recovery device. Note that a mechanism that can switch between communication and blocking of airflow, such as a slide shutter, a damper, and a valve, is used for the opening and closing unit.

  Moreover, although said collection | recovery apparatus was used for the drying apparatus and was an apparatus which can isolate | separate and collect both the dust and liquid component which are contained in gas, this invention is not limited to this. The collection device of the present invention may be used in a powder particle conveying device or may be used in other devices. Further, the recovery device of the present invention may separate and recover only dust contained in the gas, or may separate and recover only the liquid component contained in the gas.

  Moreover, about the detailed shape of a drying apparatus and a collection | recovery apparatus, you may differ from the shape shown by each figure of this application. Moreover, you may combine suitably each element which appeared in said embodiment and modification in the range which does not produce inconsistency.

1,1A, 1B Drying device 9,9A Resin pellet 20,20A Drying hopper 21,21A Exhaust port 22 Air supply port 30,30A Circulation line 31A Gas intake port 40, 40A, 40B Cyclone 41, 41B Cylindrical part 42 Lid 43 Intake pipe 44, 44B Exhaust pipe 45, 45B Collection container 46 Attached part 47 Separating part 50, 50A, 50B Demister 51, 51B Housing 52, 52B Wire mesh 53, 53B Inlet 54, 54B Outlet 55 Liquid exhaust Outlet 56 On-off valve 60 Blower 80 Heater 411 Cylindrical portion 412 Reduced diameter portion 451 Second screw groove 461 First screw groove

Claims (11)

A recovery device that is used together with an airflow generating means and separates and recovers dust and / or liquid components contained in the gas,
A separation unit that is connected to the airflow generation unit and separates the dust and / or the liquid component contained in the gas;
The separation part has a mounting part to which a disposable collection container for collecting the dust and / or the liquid component can be attached at a lower part thereof. The recovery device according to claim 1,
The collection apparatus further comprising the collection container attached to the attachment unit of the separation unit. The recovery device according to claim 1 or 2, wherein
The collection container is semi-transparent or transparent. The recovery device according to any one of claims 1 to 3,
The recovery container has a pressure resistance against an internal pressure of −50 kPa or more and +50 kPa or less. The recovery device according to any one of claims 1 to 4,
The attachment portion has a first thread groove,
The collection container has a second thread groove in its opening,
The collection device in which the first screw groove and the second screw groove are engaged. The recovery device according to any one of claims 1 to 5,
The separation unit further includes an opening / closing unit capable of switching between air flow communication and blocking at an upper portion or a lower portion of the attachment portion. The recovery device according to any one of claims 1 to 6,
The separation unit is
A cylindrical portion extending vertically, and having a reduced diameter portion that decreases in diameter as it goes downward;
An intake pipe for supplying gas in a tangential direction of the cylindrical part at the upper part of the cylindrical part;
An exhaust pipe extending vertically and having an upper end disposed above the tubular portion and a lower end disposed within the tubular portion;
Having a collection device. The recovery device according to claim 7,
A supply pipe for supplying gas to the separation unit;
A cooling means inserted in the supply pipe and reducing the temperature of the gas in the supply pipe;
A recovery device. The recovery device according to claim 7,
A supply pipe for supplying gas to the separation unit;
The supply pipe is
A recovery apparatus having a gas intake port for introducing a gas having a temperature lower than that of the gas in the supply pipe into the supply pipe. A drying device for drying powder particles of plastic molding material,
The collection device according to any one of claims 1 to 9,
A drying hopper that has an air supply port and an exhaust port, and stores powder particles therein;
A circulation line connecting the exhaust port to the air supply port;
An air flow generating means for generating an air flow from the exhaust port to the air supply port in the circulation pipe;
Heating means for heating the gas in the circulation line;
A demister for separating and removing liquid fine particles contained in the gas in the circulation pipe from the gas;
The drying device in which the recovery device, the demister, the airflow generation unit, and the heating unit are sequentially inserted in the circulation line from the exhaust port toward the air supply port. A recovery method for separating and recovering dust and / or liquid components contained in a gas,
a) attaching a disposable recovery container having an internal space for recovering the dust and / or the liquid component to the lower part of the separation unit for separating the dust and / or the liquid component contained in the gas;
b) supplying a gas to the separation unit to separate the dust and / or the liquid component contained in the gas;
c) removing the recovery container from the separation unit and discarding it together with the dust and / or the liquid component recovered inside;
A recovery method.

Images