JP2008292041A - Suction-drying device and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a suction-drying device capable of sucking the moisture adhered to a surface of electronic part, machine part, or a material to be dried such as fine particulate or the like and drying the surface by spraying hot air to improve the efficiency of drying. <P>SOLUTION: A vessel 36 storing the materials 37 to be dried is provided in a drying chamber 15. An air heater 16 for heating air is provided on the upstream side of the drying chamber 15, and a blower 17 for sucking the air in the drying chamber 15 is provided on the downstream side of the drying chamber 15. A drainage channel 32 is connected with a drain port 31 opened on a bottom face of the drying chamber 15 and has a check valve 33. When the air heater 16 and the blower 17 are operated to start drying operation, the moisture adhered to the material 37 to be dried is removed by the blower 17 and is collected in a lower part of the drying chamber 15. When the operation of the blower 17 is temporarily stopped, the check valve 33 is opened and the water stored in the lower part of the drying chamber 15 is drained through the drainage channel 32. The blower 17 is operated again after draining the water to dry the material 37 to be dried by spraying the hot air heated by the air heater 16. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a suction drying apparatus and a control method thereof, and specifically, a suction drying apparatus that dries moisture adhering to the surface of an article to be dried, such as electronic parts, mechanical parts, and fine particles, by suction and hot air, and a control method thereof. It is about.

  In JP-A-7-12458 (Patent Document 1) and JP-A-9-159357 (Patent Document 2), a heater is provided on the upstream side of the component drying chamber, and a blower is provided on the downstream side of the component drying chamber. A parts drying apparatus is disclosed.

  In these component drying apparatuses, a container containing a minute product to be dried is installed in the component drying chamber, and the heater and blower are operated while keeping the component drying chamber sealed. The bottom surface of the container is formed of a metal mesh or the like so that air can pass through the container. Since the air in the component drying chamber is sucked downward by operating the blower, the moisture adhering to the surface of the product to be dried and the water held in the gap between the products to be dried are drawn downward. At this time, the water contained in the air that has passed through the container falls and accumulates in a liquid reservoir provided below the component drying chamber, and the air is sucked into the blower. Furthermore, the moisture remaining thinly on the surface of the product to be dried is dried by passing hot air heated by the heater through the container. When the drying operation of the product to be dried is completed, the heater and the blower are stopped, and the water accumulated in the liquid reservoir is discharged to the outside.

Japanese Patent Laid-Open No. 7-12458 JP-A-9-159357

  However, in such a component drying apparatus, the water adhering to the surface of the product to be dried and the water held in the gap between the products to be dried are drawn out at the beginning of the operation of the blower and are stored in the lower liquid reservoir. Since it accumulates in the tank, water has accumulated in the liquid reservoir tank during almost the entire drying process. In addition, since the parts drying chamber and the liquid reservoir are heated by the hot air, the interior of the parts drying chamber and the liquid reservoir is in a high humidity state.

  For this reason, the drying efficiency of the product to be dried is deteriorated, and it is difficult to completely dry the product to be dried (particularly, a fine product to be dried or a product to be dried with many irregularities), or to dry completely. Has a problem that it takes a long time to dry.

  This invention is made | formed in view of such a technical subject, The place made into the objective is to provide the suction drying apparatus with high drying efficiency, and its control method.

  In order to achieve such an object, the suction drying apparatus of the present invention includes a container for containing a product to be dried, at least a bottom surface configured to allow moisture to pass through, and an air flow for containing the container. A drying chamber serving as a passage; an air suction means provided on the downstream side of the drying chamber for sucking air in the drying chamber; and provided on the upstream side of the drying chamber and sucked by the air suction means An air heating means for heating air, a drainage passage for draining water accumulated in the drying chamber or below the drying chamber to the outside of the apparatus, and the air suction means are started to adhere to the product to be dried. When the accumulated water is pulled out below the container and collected below the drying chamber, the drainage channel is opened to drain the water accumulated below the drying chamber to the outside of the apparatus, and below the drying chamber The water accumulated in Is characterized in that a configured drainage switch so as to dry the object to be dried product by air heated sucked by the air suction means in said heating means at a state close to the drainage channel.

  In the suction drying apparatus of the present invention, the air adhering to the product to be dried in the container can be forcibly drawn out and dropped downward by sucking the air in the drying chamber with the air suction means. Moisture remaining on the surface of the dried product can be dried by heating with air heating means. Moreover, in the suction drying device of the present invention, the water to be dried can be dried by the heat of the air drying means after the water drawn out from the product to be dried and discharged from the drainage channel to the outside of the device. The product to be dried can be dried in a relatively low humidity. Therefore, the drying efficiency of the suction drying device is improved, and the product to be dried can be dried more completely in a short time.

  In one embodiment of the suction drying apparatus of the present invention, the drainage switch is a check valve, and the check valve is closed when the air suction means is in operation, and the air suction means is It is configured to open when it is stopped. In such an embodiment, since the drainage switch (check valve) opens and closes in conjunction with the operation or stop of the air suction means, the structure and control of the suction drying device can be simplified.

  Moreover, in another embodiment of the suction drying apparatus of the present invention, the bottom surface of the container is made of a mesh material, and a reinforcing member for supporting the mesh material is provided on the lower surface of the mesh material. It is a feature. In such an embodiment, since the net member can be supported by the reinforcing member, the net member can be prevented from being damaged by the weight of the product to be dried.

  Furthermore, in still another embodiment of the suction drying apparatus of the present invention, a support base configured to allow air to flow is provided in the drying chamber, and the container can be placed on the support base. The support table is provided with a water-absorbing material so as to come into contact with the lower surface of the container placed on the support table. In the suction drying apparatus of the present invention, the water extracted from the product to be dried tends to accumulate on the lower surface of the container, but in such an embodiment, the water collected on the lower surface of the container is absorbed by the water absorbent material and removed from the lower surface of the container. can do.

  The suction drying apparatus control method according to the present invention includes a container for storing a product to be dried and a drying chamber serving as an air flow path for storing the container, wherein at least a bottom surface allows moisture to pass therethrough. And an air suction means provided on the downstream side of the drying chamber for sucking air in the drying chamber, and an air provided on the upstream side of the drying chamber for heating the air sucked by the air suction means A method of controlling a suction drying device having heating means, a drainage channel for draining water accumulated in the drying chamber or below the drying chamber to the outside of the device, and a drainage channel switch for opening and closing the drainage channel. A first step of starting operation of the air suction means to draw out moisture adhering to the article to be dried to the lower side of the container; and after the first step, the drainage switch is opened. Through the drainage channel, the drying chamber or A second step of draining the water accumulated below the drying chamber to the outside of the apparatus; and after the second step, the air heated by the heating means in a state where the drainage switch is closed. And a third step of drying the article to be dried by suction with an air suction means.

  In the suction drying apparatus control method of the present invention, the air adhering to the product to be dried in the container can be forcibly pulled out and dropped downward by sucking the air in the drying chamber with the air suction means. In addition, moisture remaining on the surface of the product to be dried can be dried by heating with air heating means. Moreover, in the suction drying apparatus control method of the present invention, the water to be dried can be dried by the heat of the air drying means after the water drawn and collected from the object to be dried is discharged from the drainage channel to the outside of the apparatus. The product to be dried can be dried in a state where the humidity in the drying chamber is relatively small. Therefore, the drying efficiency of the suction drying device is improved, and the product to be dried can be dried more completely in a short time.

  In one embodiment of the control method of the suction drying apparatus of the present invention, the drainage switch is a check valve, and the check valve is closed when the air suction means is operating, and the air It is configured to open when the suction means is stopped. In such an embodiment, since the drainage switch (reverse self-valve) opens and closes naturally in conjunction with the operation or stop of the air suction means, the structure and control of the suction dryer can be simplified.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a perspective view of a suction drying device 11 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the suction drying device 11 shown in FIG. 3 is a cross-sectional view taken along line XX in FIG. 2, and FIG. 4 is a cross-sectional view taken along line YY in FIG. However, in FIG.3 and FIG.4, it has shown except a container and the support stand.

  As shown in FIG. 1, an openable / closable lid 12 is provided on the upper surface of the suction drying device 11 so that a container can be taken in and out of the drying chamber of the suction drying device 11. The collected operation panel 13 is arranged.

  As shown in FIGS. 2 to 4, in the casing 14 of the suction drying device 11, there are a drying chamber 15, an air heater 16 (air heating means) equipped with an electric heater, and a blower 17 (air) for sucking air. Suction means), a control device 18 and the like are installed.

  The drying chamber 15 is constituted by a chamber 19 having an upper surface opened and a lid 12. A packing 21 is provided on the upper surface of the flange 20 provided around the upper surface opening of the chamber 19. Therefore, when the lid 12 is closed, the periphery of the lower surface of the lid 12 is pressed against the packing 21 and the inside of the drying chamber 15 is kept airtight.

  The air heater 16 heats the air that has entered from the air intake port on the lower surface and supplies it from the discharge port on the upper surface. The air intake port 16 is provided with a filter 22 for removing dust. The discharge port of the air heater 16 and the upper end side surface of the chamber 19 are connected by a hot air duct 23, and the heated air discharged from the air heater 16 is sent to the drying chamber 15 side through the hot air duct 23, Supplied into the drying chamber 15 from a long hole-like blowout hole 24 opened at the upper end portion of 19. A temperature sensor 25 for detecting the temperature of the air passing through the hot air duct 23 is provided at the upper end of the hot air duct 23.

  An air suction port 26 is opened at the back of the lower end of the chamber 19, and the air suction port 26 and the suction port 27 of the blower 17 are connected by a suction duct 28. Further, the exhaust duct 30 connected to the exhaust port 29 of the blower 17 is guided to the outside of the apparatus from the back surface of the suction drying apparatus 11.

  A drain port 31 is opened at the center of the bottom surface of the chamber 19, and a drain channel 32 connected to the drain port 31 is led from the back surface of the suction drying device 11 to the outside of the device. In addition, the drainage channel 32 includes a check valve 33 (drainage switch) that opens or closes the drainage channel 32. The check valve 33 is configured to close when the blower 17 is operated and the inside of the drying chamber 15 becomes negative pressure, and is opened when the blower 17 stops operating and the inside of the drying chamber 15 returns to atmospheric pressure.

  As shown in FIG. 2, a receiving seat 34 is provided by an angle material at a position higher than the air suction port 26 on the inner surface of the drying chamber 15, and a support base 35 is detachably mounted on the receiving seat 34. It is placed. A container 36 containing a product to be dried 37 such as an electronic component or a mechanical component can be placed on the support base 35.

  As shown in FIGS. 5 and 6, the support base 35 includes a support base body 38 and a cap 39, and has a structure that allows air and moisture to pass therethrough. That is, the support base body 38 made of stainless steel is obtained by fixing the lower end of the guide cylinder 43 whose upper half is tapered to the upper surface of the flat shelf board 40, and the shelf board 40 inside the guide cylinder 43. The circular through-hole 41 is opened in. Further, inside the guide tube 43, a water absorbent packing 42 having water absorption is attached to the upper surface of the shelf board 40. The water absorbing packing 42 is made of an elastic material such as porous silicon rubber having open cells, for example.

  The cap 39 is formed in an inverted dish shape, and a plurality of ventilation holes 46 pass through the upper stage of the cap 39, and a flange 44 extends to the outer periphery of the lower end of the cap 39. A water-absorbing sheet 45 (water-absorbing material) having water absorption is attached to the upper surface of the stainless cap 39. The water absorbing sheet 45 is formed of an elastic material such as porous silicon rubber having open cells, for example. The cap 39 is accommodated in the guide tube 43, and the flange 44 rides on the water absorbing packing 42. A vent hole 47 is opened in the water absorbent sheet 45 at the same position as the vent hole 46. Therefore, air and moisture can pass through the support base 35 through the vent holes 47 and 46.

  In the container 36, a wire net 49 (mesh material) is stretched slightly above the lower end of a cylindrical cylindrical body 48 made of stainless steel. Further, in order to prevent the wire mesh 49 from being damaged by the weight of the product 37 to be dried, a reinforcing member 50 formed of a stainless steel rod is provided at the lower part in the container 36 so as to be in contact with the lower surface of the wire mesh 49. A handle 51 is provided at the upper part of the outer peripheral surface of the cylindrical body 48.

  Thus, when the support base 35 is placed on the seat 34, the interior of the drying chamber 15 is partitioned vertically by the support base 35. When the container 36 is fitted into the guide cylinder 43, the lower end of the container 36 is guided by the taper of the guide cylinder 43 and is fitted into the gap between the cap 39 and the guide cylinder 43 so that the container 36 is supported. It is placed on the base body 38 in a positioning state.

  FIG. 8 is a block diagram schematically showing the configuration of the control device 18. The control device 18 is constituted by a microcomputer (CPU), an electronic circuit, and the like, and FIG. 8 shows only functions necessary for explaining the suction drying device 11 of the present embodiment. That is, the control device 18 includes a control device 18 that controls the air heater 16 and the blower 17 and a timer 55 for timing. Further, the drying operation control unit 52 receives an operation start signal from a start switch 54 provided on the operation panel 13 and receives a detected temperature from the temperature sensor 25. The check valve 33 is not directly controlled by the control device 18.

  And according to this suction drying apparatus 11, the drying process of a to-be-dried product can be performed according to the procedures as described below, and at that time, the control apparatus 18 performs the drying of the suction drying apparatus 11 according to the flowchart shown in FIG. Control driving. At the start of the drying process, the support base 35 is installed in the drying chamber 15 in advance. The product 37 to be dried is put into the container 36 outside the suction drying apparatus 11, and the container 36 is placed on the support base 35 with the lid 12 opened. When the container 36 is set at a predetermined position, the lid 12 is closed and the inside of the drying chamber 15 is sealed.

  Before starting the drying operation, since the blower 17 is stopped and the inside of the drying chamber 15 is at atmospheric pressure, the check valve 33 is opened.

  When the preparation is completed in this way, the start switch 54 of the operation panel 13 is pressed to turn it on. When the start switch 54 is turned on (step S1), an operation start signal is sent to the drying operation control unit 52. When receiving the operation start signal, the drying operation control unit 52 operates the air heater 16 and the blower 17 to start the drying operation (steps S2 and S3).

  When the blower 17 is operated, air in the drying chamber 15 is sucked, so that an air flow is generated in the suction drying device 11. That is, air passes through the filter 22 on the lower surface of the air heater 16 and is sucked into the air heater 16, and the air sucked into the air heater 16 flows through the hot air duct 23 from the blowout hole 24 to the drying chamber 15. Blow in. Further, the air that has entered the drying chamber 15 passes through the gap between the products to be dried 37 in the container 36, is sucked into the suction duct 28 from the air suction port 26, is sucked into the blower 17, and is sucked and dried from the exhaust duct 30. The air is exhausted to the outside of the device 11.

  Further, when the blower 17 is operated, air in the drying chamber 15 is sucked and the inside of the drying chamber 15 and the drainage channel 32 becomes negative pressure, so that the check valve 33 is naturally closed.

  Further, when the air heater 16 is operated, the heat generation temperature of the electric heater rises, and as the hot air duct 23, the drying chamber 15 and the like warm up, the temperature of the hot air passing through the drying chamber 15 also gradually increases. Hot air is blown onto the dried product 37. However, the hot air temperature is detected by the temperature sensor 25, and the temperature is controlled so as to be stabilized at a substantially constant temperature. This hot air temperature can be set in advance on the operation panel 13 in accordance with the quantity and shape of the product 37 to be dried, and is usually set within a range of 60 ° C to 90 ° C.

  Furthermore, immediately after the start of the drying operation, the air in the drying chamber 15 is sucked through the gaps between the products to be dried 37, so that moisture adhered to the surface of the products to be dried 37 and the products to be dried 37 are removed. Moisture held in the gap is drawn downward and collected in the lower part of the drying chamber 15 and the drainage channel 32. Most of the water adhering to the surface of the product to be dried 37 and the water held in the gap between the products to be dried 37 fall downward in the tens of seconds after the operation of the blower 17 is started. The phenomenon stops when several tens of seconds have elapsed from the start of operation of the blower 17.

  Therefore, when the timer 55 counts the elapsed time after the start of the operation of the blower 17 for a predetermined time T1 (that is, the time for which water is almost pulled out downward, for example, 30 seconds) (when it becomes yes in step S4) ), The drying operation control unit 52 stops the air heater 16 and the blower 17 (steps S5 and S6).

  When the blower 17 is stopped, the inside of the drying chamber 15 returns to the atmospheric pressure, so that the check valve 33 opens naturally, and water accumulated in the lower portion of the drying chamber 15 is discharged from the drainage channel 32 to the outside. Then, when the predetermined time T2 (the time required for drainage, for example, 30 seconds) has elapsed since the blower 17 was stopped and the water in the drying chamber 15 has been drained (when the answer is yes in step S7). Then, the air heater 16 is operated again and the blower 17 is operated at a relatively high capacity (80 Hz) (steps S8 and S9). When the blower 17 is operated, the inside of the drying chamber 15 becomes negative pressure, so that the check valve 33 is closed and the inside of the drying chamber 15 is sealed.

  After the water accumulated in the lower part of the drying chamber 15 is drained to the outside of the suction drying device 11, when the operation of the air heater 16 and the blower 17 is continued, the product to be dried 37 is heated by hot air, Moisture remaining thinly on the surface is evaporated by heat and is discharged from the exhaust duct 30 to the outside through the blower 17. In addition, since the water accumulated in the lower part of the drying chamber 15 is discharged to the outside, the humidity in the drying chamber 15 can be kept relatively low, and evaporation of moisture remaining on the surface of the product to be dried 37 can be reduced. The product to be dried 37 can be efficiently dried in a short time.

  When the predetermined time T3 (which can be adjusted according to the shape and amount of the product to be dried 37. For example, about 30 seconds) elapses after the air heater 16 and the blower 17 are operated again (when yes in step S10), the blower The capacity of 17 is slightly reduced (60 Hz) and the drying operation is continued (step S11).

  When a predetermined time T4 (which can be adjusted according to the shape and amount of the product to be dried 37. For example, about 30 seconds) has elapsed since the ability of the blower 17 is reduced (when yes in step S12), the air heater 16 is turned off. (Step S13), and the product to be dried 37 is cooled by cold air.

  In this way, when the cool air is sent for a predetermined time T5 (for example, about 30 seconds) to finish cooling the article to be dried 37 (yes in step S14), the blower 17 is stopped (step S15), and the drying operation is ended (step S14). S16).

  When the drying operation is completed, the lid 12 is opened, the handle 51 of the container 36 is grasped, and the container 36 is taken out from the drying chamber 15. Normally, at this time, the lower surface (reinforcing member 50) of the container 36 is often attached with water droplets or is wet, but in this embodiment, the water absorbent sheet 45 is in contact with the lower surface of the container 36. The moisture on the lower surface of the container 36 is absorbed by the water absorbing sheet 45, and the lower surface of the extracted container 36 is not wetted.

  In the suction drying apparatus 11 of the present invention, since the water to be dried 37 is dried after discharging the water accumulated in the lower part of the drying chamber 15 as described above, the inside of the drying chamber 15 is kept in a relatively low humidity state. The to-be-dried product 37 can be dried with warm air, and the drying operation can be performed efficiently in a short time.

  In the above-described embodiment, the air heater 16 is turned on immediately after the start of the drying operation. However, the timing when the air heater 16 is turned on finishes draining the water accumulated in the lower portion of the drying chamber 15 from the start of the drying operation. It may be between. However, since the drying operation time can be shortened as the timing of turning on the air heater 16 is earlier, it is desirable to turn on the air heater 16 from the beginning of the drying operation as in the above embodiment.

  Moreover, in the said embodiment, although the non-return valve 33 was used as a drainage channel switch, and the check valve 33 opened and closed in conjunction with the blower 17, an electromagnetic switching valve was used as a drainage channel switch, and a control apparatus was used. May control the opening and closing of the electromagnetic on-off valve.

FIG. 1 is a perspective view of a suction drying apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the suction drying apparatus shown in FIG. 3 is a cross-sectional view taken along the line XX of FIG. However, it is shown excluding the container and the support base. FIG. 4 is a cross-sectional view taken along line YY of FIG. However, it is shown excluding the container and the support base. FIG. 5 is a cross-sectional view showing the container and the support stand shown in FIG. 2 in a separated state. FIG. 6A is a plan view of a cap constituting the support base, and FIG. 6B is a plan view of the support base body constituting the support base. FIG. 7A is a plan view of the container, and FIG. 7B is a bottom view of the container. FIG. 8 is a block diagram showing the configuration of the control unit of the suction drying apparatus according to one embodiment of the present invention. FIG. 9 is a flowchart for explaining the operation method of the suction drying apparatus according to the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Suction drying apparatus 15 Drying room 16 Air heater 17 Blower 18 Control apparatus 22 Filter 23 Hot air duct 24 Blowing hole 26 Air inlet 28 Suction duct 30 Exhaust duct 32 Drainage path 33 Check valve 35 Support stand 36 Container 37 Dry goods 45 Water absorption sheet 49 Wire mesh 50 Reinforcement member 51 Handle 52 Valve control unit

Claims (6)

A container for containing a product to be dried, the bottom surface of which is configured to allow moisture to pass through;
A drying chamber serving as an air flow path for housing the container;
An air suction means provided on the downstream side of the drying chamber, for sucking air in the drying chamber;
An air heating means provided on the upstream side of the drying chamber for heating the air sucked by the air suction means;
A drainage channel for draining water accumulated in the drying chamber or below the drying chamber to the outside of the device;
When the water suction means starts operation and the moisture adhering to the product to be dried is pulled out below the container and collected below the drying chamber, the drainage channel is opened and collected below the drying chamber. The water is drained to the outside of the apparatus, and the water accumulated under the drying chamber is drained, the drainage channel is closed, heated by the heating means, and covered by the air sucked by the air suction means. A suction drying apparatus comprising a drainage switch configured to dry a dried product. The drainage switch is a check valve,
2. The check valve according to claim 1, wherein the check valve is configured to be closed when the air suction unit is in operation and to be opened when the air suction unit is stopped. Suction dryer.   The suction drying apparatus according to claim 1, wherein a bottom surface of the container is made of a mesh material, and a reinforcing member for supporting the mesh material is provided on a lower surface of the mesh material.   A support base configured to allow air to flow is provided in the drying chamber, and the container can be placed on the support base. The suction drying apparatus according to claim 1, wherein a water-absorbing material is provided so as to come into contact with a lower surface of the placed container. A container for containing a product to be dried, the bottom surface of which is configured to allow moisture to pass through;
A drying chamber serving as an air flow path for housing the container;
An air suction means provided on the downstream side of the drying chamber, for sucking air in the drying chamber;
An air heating means provided on the upstream side of the drying chamber for heating the air sucked by the air suction means;
A drainage channel for draining water accumulated in the drying chamber or below the drying chamber to the outside of the device;
A method of controlling a suction dryer having a drainage switch for opening and closing the drainage channel,
A first step of starting operation of the air suction means and extracting moisture adhering to the article to be dried to the lower side of the container;
After the first step, the second step of draining the water accumulated in the drying chamber or below the drying chamber through the drainage channel opened by the drainage switch to the outside of the device;
After the second step, the third step of drying the article to be dried by sucking the air heated by the heating means with the air suction means with the drainage switch closed.
Control method of suction drying apparatus provided with. The drainage switch is a check valve,
6. The check valve according to claim 5, wherein the check valve is configured to be closed when the air suction unit is in operation and to be opened when the air suction unit is stopped. Control method of suction drying device.

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