JP6796874B2 - Drying device - Google Patents

Description

Embodiments of the present invention relate to a drying device.

In a conventional drying device, a drying gas generated or heated by a heat source is used to dry the object to be dried. Such a drying device includes a circulation type drying device that returns a part of the drying gas that dried the object to be dried to a heat source.

A conventional circulation type drying device includes a gas ejection type drying device that ejects a drying gas and causes it to collide with an object to be dried to dry the object to be dried. In such a gas ejection type drying device, heat transfer can be improved by colliding the drying gas with the object to be dried at high speed.

The gas ejection type drying device is provided with a plurality of ejection ports for ejecting drying gas. The object to be dried is moved in the drying device by the transport device. The object to be dried is moved to the outside of the drying device, for example, through a drying step in a plurality of drying zones provided in the moving direction.

At this time, in the transport device, the operation of intermittently moving the object to be dried by a predetermined distance at a predetermined time interval is performed. It should be noted that such an operation in the transport device is called a tact operation. Further, a cycle of moving a predetermined distance at a predetermined time interval and stopping is called one tact. That is, by moving the object to be dried by one tact, the object to be dried moves to the next drying zone provided in the moving direction.

One drying zone in a conventional circulation type drying device is provided with a plurality of spouts for ejecting a drying gas and a suction port for sucking the drying gas returned to a heat source from the drying zone.

The drying zone in the drying device is formed, for example, in a cylinder extending in the transport direction. In one drying zone, a plurality of spouts are provided at predetermined intervals along the transport direction on the lower side of both side walls of the cylinder extending in the transport direction. Further, in one drying zone, a plurality of suction ports are provided at predetermined intervals along the transport direction on the upper side of both side walls of the cylinder extending in the transport direction.

As described above, in one drying zone, a spout is provided on the lower side of both side walls, and a suction port is provided on the upper side of both side walls. That is, in one dry zone, the spout and the suction port coexist.

In the drying zone of the conventional drying device, the suction port may be provided on the lower side of both side walls of the cylinder extending in the transport direction. In this case, the spout is provided on the upper side of both side walls of the cylinder extending in the transport direction. Further, in the drying zone of the conventional drying device, the suction port may be provided on the ceiling or the floor surface of the drying zone.

In such a conventional drying device, the drying gas is ejected from the ejection port toward the object to be dried. The drying gas ejected from the ejection port heats the object to be dried, is sucked from the suction port, and is circulated to the heating source.

Japanese Patent No. 2512517

In the conventional circulation type drying apparatus as described above, it is preferable that the temperature distribution of the drying gas in the drying zone is uniform. In order to make the temperature distribution uniform, a plurality of spouts are provided on both side walls of the cylinder facing the material to be transported.

However, since the conventional drying device has a suction port on the side wall, the installation range of the spout provided on the side wall is limited. Further, when the spout is adjacent to the suction port, the drying gas ejected from the spout may be sucked from the suction port before coming into contact with the object to be dried. Therefore, the temperature distribution of the drying gas in the drying zone becomes non-uniform, and the calorific value of the drying gas ejected from the ejection port is not effectively used for drying the object to be dried.

An object to be solved by the present invention is to provide a drying apparatus capable of making the temperature distribution of the drying gas uniform in the drying zone and effectively utilizing the calorific value of the drying gas.

The drying apparatus of the embodiment blows a drying gas onto the transported object to be dried to dry the object to be dried. This drying device includes a heat source unit that generates a drying gas for drying the object to be dried, a plurality of drying zones provided in the transport direction of the object to be dried and drying the object to be dried for a predetermined time, and each of the above-mentioned drying devices. A drying gas provided in the zone and ejecting the drying gas generated in the heat source portion toward the object to be dried and a drying gas provided in the drying zone and ejected into the drying zone are used in the heat source portion. It is provided with a suction zone having a suction port for sucking back to.

According to the drying apparatus of the present invention, the temperature distribution of the drying gas in the drying zone can be made uniform, and the calorific value of the drying gas can be effectively used.

It is a figure which showed typically the outline of the drying apparatus of 1st Embodiment. It is a figure which shows the AA cross section of FIG. It is a figure which shows the BB cross section of FIG. It is a figure which shows the CC cross section of FIG. It is a perspective view which shows the structure of the slit-shaped drying gas ejection nozzle. It is a figure which shows the cross section corresponding to the cross section of the drying apparatus shown in FIG. 2 in the drying apparatus of 2nd Embodiment. It is a figure which shows the cross section corresponding to the cross section of the drying apparatus shown in FIG. 3 in the drying apparatus of 2nd Embodiment.

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

(First Embodiment)
FIG. 1 is a diagram schematically showing an outline of the drying apparatus 10 according to the first embodiment.

As shown in FIG. 1, the drying device 10 includes a heat source unit 20 and a drying chamber 60 for drying the object to be dried W with the drying gas discharged from the heat source unit 20. The drying device 10 is a circulation type drying device that introduces the drying gas generated in the heat source unit 20 into the drying chamber 60 and returns a part of the drying gas introduced into the drying chamber 60 to the heat source unit 20.

First, the configuration of the heat source unit 20 will be described.

Here, the combustor 20A will be described as an example as the heat source unit 20. In this case, the drying gas is the combustion gas generated by the combustor 20A. In the heat source unit 20, an electric heater that heats air taken in from the outside may be used as a heating source. In this case, the drying gas is heated air.

The combustor 20A includes a combustion casing 21 having an internal space and a burner 22 provided at one end 21a of the combustion casing 21. The burner 22 includes a fuel supply system 23 that supplies fuel from the fuel supply source 25, and an air supply system 24 that supplies air.

Here, an example in which the intake fan 24a is provided as the air supply system 24 is shown. The air supply system 24 may be, for example, a system that supplies the air discharged from an air compressor or the like to the burner 22.

In the burner 22, the combustion gas generated by burning the fuel supplied from the fuel supply system 23 and the air supplied from the air supply system 24 spreads inside the combustion casing 21. This combustion gas functions as a drying gas for drying the object to be dried W.

The other end 21b of the combustion casing 21 has an outlet opening (not shown) for discharging the internal combustion gas. This outlet opening is connected to the filter portion 40 via, for example, a pipe 30.

The filter unit 40 includes a casing 41 and a filter 42 provided in the casing 41. The filter 42 is provided, for example, over a cross section perpendicular to the flow direction of the combustion gas, as shown in FIG. The filter 42 removes foreign matter in the combustion gas flowing toward the outlet opening (not shown) of the casing 41.

Further, the filter unit 40 is provided with a differential pressure gauge 43 that detects the differential pressure between the downstream side of the filter 42 and the upstream side of the filter 42 in the casing 41. When the differential pressure gauge 43 detects a differential pressure of a predetermined value or more, it is determined that the filter 42 is clogged, for example.

The filter unit 40 may be integrally configured with the combustion casing 21. In this case, the pipe 30 that connects the filter unit 40 and the combustion casing 21 becomes unnecessary.

The space inside the casing 41 on the downstream side of the filter 42 communicates with the drying chamber 60 via the introduction pipe 31. In the introduction pipe 31, drying gas is introduced from the filter unit 40 into the drying chamber 60 via the introduction pipe 31, and from the drying chamber 60 to the combustor 20A (inside the combustion casing 21) via the return pipe 35 described later. A circulation fan 32 is interposed to return the drying gas.

In the circulation fan 32, for example, the flow rate of the drying gas supplied to the drying chamber 60 is adjusted by controlling the fan motor 32a to adjust the fan rotation speed. The circulation fan 32 is composed of, for example, a sirocco fan or a turbo fan.

Note that FIG. 1 shows an example in which the drying gas is supplied to the drying chamber 60 by one introduction pipe 31, but the present invention is not limited to this. For example, the introduction pipe 31 on the drying chamber 60 side may be branched into a plurality of pipes, and these branch pipes may be connected to the drying chamber 60. As a result, the drying gas can be uniformly introduced into the drying chamber 60.

Next, the configuration of the drying chamber 60 will be described.

The drying chamber 60 dries the object to be dried W with the drying gas generated in the combustor 20A. As shown in FIG. 1, for example, the drying chamber 60 extends in the transport direction (hereinafter, referred to as the transport direction) of the object to be dried W.

Note that FIG. 1 shows a vertical cross section of the drying chamber 60 at the center in the width direction of the drying chamber 60. The width direction of the drying chamber 60 is the direction perpendicular to the paper surface in FIG. Further, in FIG. 1, the position of the object to be dried W to be dried in each of the drying zones 61A, 61B, 61C, and 61D is shown by a broken line. In FIG. 1, the transport device for transporting the object to be dried W is omitted.

Here, FIG. 2 is a diagram showing a cross section taken along the line AA of FIG. FIG. 3 is a diagram showing a BB cross section of FIG. FIG. 4 is a diagram showing a CC cross section of FIG.

As shown in FIG. 1, the drying chamber 60 includes a plurality of drying zones 61A, 61B, 61C, 61D in the transport direction. Further, the drying chamber 60 includes suction zones 62A, 62B, 62C between the drying zones 61A, 61B, 61C, and 61D.

The cross-sectional shapes of the drying zones 61A, 61B, 61C, 61D and the suction zones 62A, 62B, 62C, which are perpendicular to the transport direction, are rectangular, for example, as shown in FIGS. 2 and 3.

The cross-sectional shape is not limited to this. In the cross section of FIGS. 2 and 3, the upper walls of the drying zones 61A, 61B, 61C, 61D and the suction zones 62A, 62B, 62C may be formed in an arch shape, for example. In this case, the cross-sectional shapes of the drying zones 61A, 61B, 61C, 61D and the suction zones 62A, 62B, 62C, which are perpendicular to the transport direction, are inverted U-shaped.

In the drying zones 61A, 61B, 61C, and 61D, the object to be dried W is held for a predetermined time to be dried. That is, due to the tact operation described above in the transport device 150, the object to be dried W stays in the drying zones 61A, 61B, 61C, and 61D for a predetermined time. Then, after a lapse of a predetermined time, it passes through the suction zone and moves to the next drying zone. After the drying treatment of the final drying zone 61D is completed, the object to be dried W is discharged from the drying chamber 60 to the outside.

Here, a specific configuration of the drying chamber 60 will be described.

The drying chamber 60 includes, for example, an outer casing 70 and an inner casing 80 inside the outer casing 70, as shown in FIG. The outer casing 70 is a tubular body extending in the transport direction. The inner casing 80 is, for example, a columnar member having a U-shaped cross section extending in the transport direction.

Then, the U-shaped opening side of the inner casing 80 is arranged on the bottom wall 70b of the outer casing 70. That is, as shown in FIG. 2, a space surrounded by the inner casing 80 and the bottom wall 70b of the outer casing 70 is formed. In FIG. 2, this space is the drying zone 61A.

Further, a space 90 is formed between the outer casing 70 and the inner casing 80, and the drying gas is introduced into the space 90 via the introduction pipe 31. That is, the introduction pipe 31 is connected to the outer casing 70.

As shown in FIG. 2, the space 90 is a space that communicates from the upper part of the drying chamber 60 to both sides. In the cross section shown in FIG. 2, the space 90 is an inverted U-shaped space. That is, the space 90 is formed by extending the inverted U-shaped space in the transport direction.

As shown in FIG. 1, an inlet gate 71 is provided at one end of the outer casing 70, and an outlet gate 72 is provided at the other end of the outer casing 70.

As shown in FIGS. 1 and 4, the entrance gate 71 slidably supports, for example, the entrance door 71a, the lower slide member 71b that slidably supports the entrance door 71a from below, and the entrance door 71a from above. It includes an upper slide member 71c. As shown in FIG. 4, the entrance door 71a is composed of, for example, two doors that can slide in the width direction (left-right direction in FIG. 4) of the drying chamber 60.

The exit gate 72 has the same configuration as the inlet gate 71. That is, as shown in FIG. 1, for example, an outlet door 72a, a lower slide member 72b that slidably supports the exit door 72a from below, and an upper slide member 72c that slidably supports the exit door 72a from above. Be prepared. The exit door 72a is composed of, for example, two doors that can slide in the width direction of the drying chamber 60.

Although the inlet door 71a and the outlet door 72a that can slide in the width direction of the drying chamber 60 have been illustrated and described here, the present invention is not limited to this configuration. The entrance door 71a and the exit door 72a may be composed of, for example, two doors that can slide in the vertical direction (vertical direction).

Here, the object to be dried W is transported by the transport device 150, for example, as shown in FIG. The transport device 150 includes, for example, a rail 151, a drive unit 152, and a support unit 153.

The rail 151 is arranged on the floor of the drying chamber 60 in the transport direction. The support portion 153 is arranged on the drive portion 152, for example, and supports the object to be dried W. The support portion 153 is composed of a rod-shaped member or the like that stably supports the object to be dried W from below.

The drive unit 152 includes a support unit 153 and a drive mechanism capable of moving the object to be dried W supported by the support unit 153 along the rail 151.

The configuration of the transport device 150 is not limited to this. The transport device 150 may have a configuration in which the object to be dried W can be moved to the drying zones 61A, 61B, 61C, and 61D by tact operation.

Next, the configurations of the drying zones 61A, 61B, 61C, and 61D will be described. Since the configurations of the drying zones 61A, 61B, 61C, and 61D are the same, the configuration of the drying zones 61A will be described here.

As shown in FIG. 2, the drying zone 61A is formed in the inner casing 80. Specifically, as described above, the drying zone 61A is formed in a space surrounded by the inner casing 80 and the bottom wall 70b of the outer casing 70.

A drying gas ejection nozzle 100 is provided on the inner surfaces 81a and 82a of the side walls 81 and 82 of the inner casing 80 forming the drying zone 61A. As shown in FIG. 1, a plurality of drying gas ejection nozzles 100 are arranged on the inner surfaces 81a and 82a of the side walls 81 and 82 in a houndstooth pattern, for example.

In other words, a plurality of stages of drying gas ejection nozzles 100 are arranged at equal intervals in the height direction. Further, the drying gas ejection nozzles 100 are arranged at equal intervals in the transport direction. Then, in the adjacent stage, the drying gas ejection nozzle 100 is arranged so as to be displaced in the transport direction. By arranging the drying gas ejection nozzles 100 in this way, the arrangement is in a houndstooth pattern.

The arrangement configuration of the drying gas ejection nozzle 100 is not limited to this. In the drying zone 61A, the drying gas ejection nozzle 100 may be arranged so that the drying gas can be blown onto the object W to be dried.

The drying gas ejection nozzle 100 is provided so as to project from the inner surfaces 81a and 82a into the drying zone 61A. The drying gas ejection nozzle 100 is provided, for example, perpendicular to the inner surfaces 81a and 82a. The tip of the drying gas ejection nozzle 100 projects toward the center of the drying zone 61A from the suction port 63 of the suction zone 62A, which will be described later.

Further, a drying gas ejection nozzle 100 is provided on the inner surface 83a of the upper wall 83 of the inner casing 80. The drying gas ejection nozzles 100 on the upper wall 83 are also arranged in a houndstooth pattern as shown in FIG. 1 like the drying gas ejection nozzles 100 on the side walls 81 and 82.

In other words, a plurality of stages of drying gas ejection nozzles 100 are arranged at equal intervals in the transport direction. Further, the drying gas ejection nozzles 100 are arranged at equal intervals in the width direction of the drying chamber 60. Then, in the adjacent stage, the drying gas ejection nozzle 100 is arranged so as to be displaced in the width direction of the drying chamber 60. By arranging the drying gas ejection nozzles 100 in this way, the arrangement is in a houndstooth pattern.

The drying gas ejection nozzle 100 is provided so as to project from the inner surface 83a into the drying zone 61A. The drying gas ejection nozzle 100 is provided, for example, perpendicular to the inner surface 83a.

Here, the arrangement configuration of the drying gas ejection nozzle 100 on the inner surfaces 81a, 82a, 83a is not limited to the above configuration. The drying gas ejection nozzle 100 may be arranged in the drying zone 61A so that the drying gas can be blown onto the object W to be dried.

The drying gas ejection nozzle 100 functions as an ejection portion. Further, the arrangement configuration of the inner casing 80 in the drying gas ejection nozzle 100 on the side walls 81, 82 and the upper wall 83 is not particularly limited, and is not limited to the above configuration.

Here, in order to improve the heat transfer coefficient, the flow of the drying gas ejected from the drying gas ejection nozzle 100 is preferably a jet flow that does not easily spread to the outside after ejection and collides with the object to be dried W at high speed. .. Therefore, the drying gas ejection nozzle 100 is composed of, for example, a tubular tube that easily forms such a jet. As the tubular tube, for example, a circular tube or the like is used.

Further, as shown in FIGS. 1 and 2, a lower ejection portion 110 is provided on both side walls 81 and 82 of the drying zone 61A below the object to be dried W to be transported. That is, the lower ejection portion 110 is provided below the drying gas ejection nozzle 100 provided on both side walls 81 and 82 of the drying zone 61A.

The lower ejection portion 110 includes an opening 111 formed in the side walls 81 and 82, and a ejection lead-out plate 112 provided in the opening 111.

The opening 111 is, for example, a rectangular opening formed in the side walls 81 and 82. At least one opening 111 is provided in one drying zone 61A. For example, as shown in FIG. 1, two openings 111 may be provided side by side in the transport direction.

The blowout lead-out plate 112 has a function of adjusting the blowing direction of the drying gas. As shown in FIGS. 1 and 2, the blowout lead-out plate 112 is a plate-shaped member having a length corresponding to the width (length in the transport direction) of the opening 111. A plurality of blowout lead-out plates 112 are arranged in the opening 111 at predetermined intervals in the height direction (vertical direction).

Each blowout lead-out plate 112 is supported so that the angle can be changed with respect to the horizontal direction in the cross section shown in FIG. In this way, since the angle of each blowout lead-out plate 112 is supported so as to be changeable, the angle with respect to each horizontal direction can be arbitrarily set. Further, by supporting each blowout lead-out plate 112 in this way, the ejection direction of the ejected drying gas can be arbitrarily adjusted.

Then, a part of the drying gas introduced into the space 90 passes between the opening 111 and the blowout lead-out plate 112 and is ejected into the drying zone 61A. The drying gas ejected from the lower ejection portion 110 collides with the object to be dried W from the lower side.

By providing the lower ejection portion 110, it is possible to make the temperature distribution of the drying gas in the drying zone 61A uniform. Further, by colliding the drying gas with the object W to be dried from the lower side, for example, in the case of a structure in which the object W to be dried opens downward, the gas for drying can be introduced inside the object W to be dried. .. As a result, the object to be dried W can be uniformly dried.

Further, since the angle of each blowout lead-out plate 112 is supported so as to be changeable, it is possible to more reliably realize uniform temperature distribution of the drying gas in the drying zone 61A and uniform drying of the object to be dried W. it can.

Next, the configurations of the suction zones 62A, 62B, and 62C will be described. Since the configurations of the suction zones 62A, 62B, and 62C are the same, the configuration of the suction zones 62A will be described here.

The suction zone 62A is formed between the drying zone 61A and the drying zone 61B.

As shown in FIG. 3, the suction zone 62A is formed in a space surrounded by the inner casing 80, the side walls 64 and 65 having the suction port 63, and the bottom wall 70b of the outer casing 70. In the suction zone 62A, the side walls 81 and 82 of the inner casing 80 are recessed, for example, on the side wall 70a side of the outer casing 70.

As shown in FIG. 3, the recesses of the side walls 81 and 82 are composed of, for example, rectangular parallelepiped recesses 66 and 67 in which the drying zone 61A side (the object W side to be dried) is open. That is, one side of the rectangular parallelepiped recesses 66 and 67 opens toward the drying zone 61A, and the other five sides are composed of walls.

As shown in FIG. 3, there is a gap between the wall portions 66a and 67a on the side wall 70a side of the outer casing 70 of the recesses 66 and 67 and the side wall 70a of the outer casing 70. That is, the drying gas guided into the space 90 can spread in the vertical direction (vertical direction) on both sides of the drying chamber 60.

Further, there is a gap (space) between the lower wall portions 66b and 67b of the recesses 66 and 67 and the bottom wall 70b of the outer casing 70. That is, the drying gas guided into the space 90 can spread in the width direction (left-right direction in FIG. 3) of the drying chamber 60 at the bottom of the drying chamber 60. As a result, the flow rate distribution of the drying gas ejected from the lower ejection portion 110 of the adjacent drying zones 61A, 61B, 61C, 61D can be made uniform.

Plate-shaped side walls 64 and 65 are provided in the openings of the recesses 66 and 67 to close the openings. Spaces 68 and 69 are formed by closing the recesses 66 and 67 with the side walls 64 and 65. The spaces 68 and 69 are partitioned from the space 90 between the outer casing 70 and the inner casing 80.

As shown in FIGS. 1 and 3, suction ports 63 are formed on the side walls 64 and 65. The suction port 63 is composed of, for example, openings formed in the side walls 64 and 65. At least one suction port 63 is provided. For example, as shown in FIGS. 1 and 3, the side walls 64 and 65 may be provided with a plurality of suction ports 63 in the vertical direction. Here, an example is shown in which three suction ports 63 are formed in the vertical direction.

The suction port 63 is an opening for sucking the drying gas from the suction zone 62A. The drying gas sucked from the suction port 63 is guided to the spaces 68 and 69.

The suction port 63 is provided with an opening degree adjusting unit 120 for adjusting the opening degree of the suction port 63. As shown in FIGS. 1 and 3, for example, the opening degree adjusting unit 120 makes the adjusting door 121, the downward sliding member 122 that slidably supports the adjusting door 121 from below, and the adjusting door 121 slidable from above. It includes an upward slide member 123 that supports it.

As shown in FIG. 1, the adjusting door 121 is composed of, for example, two doors that can slide in the transport direction (left-right direction in FIG. 1). For example, the opening degree of the suction port 63 can be adjusted by adjusting the gap between the two adjusting doors 121.

Here, the opening degree of each of the three suction ports 63 provided in the vertical direction can be adjusted. As a result, even if the suction amount differs depending on the position in the vertical direction, the flow rate of the drying gas sucked from each suction port 63 can be made uniform by adjusting the opening degree of each suction port 63.

The configuration of the opening degree adjusting unit 120 is not limited to this. The opening degree adjusting unit 120 may have a configuration capable of adjusting the opening degree of the suction port 63.

One end of a return pipe 35 for returning the drying gas guided to the spaces 68 and 69 into the combustion casing 21 of the combustor 20A is connected to, for example, the upper part of the inner casing 80 constituting the spaces 68 and 69. ing. The other end of the return pipe 35 is connected to the combustion casing 21 as shown in FIG.

The return pipe 35 connected to the internal casing 80 constituting the spaces 68 and 69 of the suction zones 62A, 62B and 62C becomes, for example, one collecting pipe and is connected to the combustion casing 21.

The pipes 36 and 37 are connected to the return pipe 35 which has become a collecting pipe so as to branch from the return pipe 35. The pipe 36 is branched on the drying chamber 60 side of the pipe 37.

One end of the pipe 36 is, for example, open to the atmosphere. The pipe 36 exhausts a part of the drying gas flowing through the return pipe 35 to the outside. An exhaust fan 36a is interposed in the pipe 36. By adjusting the rotation speed of the exhaust fan 36a, the flow rate of the drying gas exhausted to the outside is adjusted.

Here, an example is shown in which a part of the drying gas flowing through the return pipe 35 via the pipe 36 is exhausted to the outside, but the present invention is not limited to this. For example, the space 68 or 69 in which the drying gas sucked from the suction port 63 is guided may be directly exhausted to the outside. In this case, for example, an exhaust pipe communicating with the spaces 68 and 69 is provided, and the air is exhausted from the spaces 68 and 69 to the outside through the exhaust pipe. The exhaust pipe is provided with an exhaust fan. In this case, the configuration of the pipe 36 becomes unnecessary.

One end of the pipe 37 is, for example, open to the atmosphere. The pipe 37 is a pipe for introducing the atmosphere (air) into the drying gas returning from the drying chamber 60 to the combustion casing 21 via the return pipe 35. That is, the atmosphere is sucked from the end of the pipe 37 on the open side to the atmosphere and introduced into the return pipe 35.

The pipe 37 is provided with a flow rate adjusting unit 37a for adjusting the flow rate of the air introduced into the return pipe 35. The flow rate adjusting unit 37a is composed of, for example, a damper. The opening degree of the damper is adjusted so that, for example, a constant flow rate of air is introduced into the return pipe 35.

Next, the operation of the drying device 10 will be described.

At the start of operation of the drying device 10, the intake fan 24a, the circulation fan 32, and the exhaust fan 36a are driven.

When the combustion in the burner 22 starts, the drying gas (combustion gas) in the burner 22 is guided into the filter unit 40 through the pipe 30 by the suction of the circulation fan 32. The drying gas guided into the filter unit 40 passes through the filter 42 to remove foreign matter.

The drying gas that has passed through the filter 42 is sucked into the introduction pipe 31. The drying gas sucked into the introduction pipe 31 is introduced into the space 90 of the drying chamber 60.

The drying gas introduced into the space 90 spreads throughout the space 90. The drying gas spread over the entire space 90 is ejected from the drying gas ejection nozzles 100 of the drying zones 61A, 61B, 61C, and 61D toward the object to be dried W.

In each of the drying zones 61A, 61B, 61C, and 61D, for example, the flow velocities of the drying gas ejected from each of the drying gas ejection nozzles 100 are adjusted to be substantially equal.

The drying gas ejected from the drying gas ejection nozzle 100 collides with the object to be dried W moved by the transport device 150. Since the flow velocity of the drying gas ejected from each drying gas ejection nozzle 100 is substantially uniform, the object to be dried W can be heated uniformly.

Further, the flow of the drying gas ejected from each drying gas ejection nozzle 100 is suppressed in the direction perpendicular to the ejection direction and is high speed. Therefore, the heat transfer between the drying gas and the object to be dried W is improved. As a result, the amount of heat of the drying gas can be efficiently transferred to the object to be dried W.

Further, in the lower ejection portion 110 provided below the side walls 81 and 82, the drying gas is ejected into the drying zones 61A, 61B, 61C and 61D through the blowout lead-out plate 112. The drying gas ejected from the lower ejection portion 110 collides with the object to be dried W from the lower side. For example, in the case of a structure in which the object to be dried W opens downward, a drying gas is introduced into the object to be dried W. As a result, the object to be dried W can be uniformly dried.

In the suction zones 62A, 62B, 62C provided between the drying zones 61A, 61B, 61C, 61D, the drying gas is sucked from the suction port 63. The drying gas sucked from the suction port 63 is guided to the spaces 68 and 69 shown in FIG.

The drying gas guided to the spaces 68 and 69 passes through the return pipe 35 and is returned into the combustion casing 21. At this time, a part of the drying gas flowing through the return pipe 35 is guided into the pipe 36 by the drive of the exhaust fan 36a and discharged into the atmosphere.

Here, since the drying gas in the combustion casing 21 is sucked by the circulation fan 32, the pressure in the combustion casing 21 becomes lower than the pressure in the suction zones 62A, 62B, 62C of the drying chamber 60. Therefore, the drying gas in the suction zones 62A, 62B, and 62C is guided into the combustion casing 21 through the return pipe 35.

In addition, air is sucked from the end of the pipe 37 on the open side to the atmosphere. Then, a predetermined amount of air is introduced into the return pipe 35 through the pipe 37 and guided into the combustion casing 21.

The drying gas and air introduced into the combustion casing 21 via the return pipe 35 are mixed with the combustion gas generated by the combustion in the burner 22. Then, it passes through the pipe 30 and the filter unit 40 again, is sucked into the introduction pipe 31, and is introduced into the space 90 of the drying chamber 60.

In this way, a part of the drying gas generated in the combustor 20A is circulated to the combustor 20A through the drying chamber 60.

Here, the flow rate of the air introduced through the pipe 37 is the same as or higher than the flow rate obtained by subtracting the amount of combustion exhaust gas from the flow rate of the drying gas discharged into the atmosphere through the pipe 36. The amount of combustion exhaust gas is the amount of combustion gas generated by fuel and air in the combustor 20A.

The reason why the atmosphere is introduced from the pipe 37 and a part of the drying gas is discharged from the pipe 36 in this way is to suppress an increase in the concentration of volatile organic compounds (VOC) in the circulation system of the drying gas. is there. This makes it possible to prevent accidents such as explosions. The volatile organic compound is contained in, for example, a paint.

Further, when fuel and air are supplied in the combustor 20A under the condition that the excess air ratio is less than 1, introducing the atmosphere from the pipe 37 and discharging a part of the drying gas from the pipe 36 is a combustion. It also secures the necessary secondary air.

Then, in each of the drying zones 61A, 61B, 61C, and 61D, the object to be dried W that has been dried for a predetermined time is moved to the next drying zone by the transport device 150. At this time, the object to be dried W that has been dried in the drying zone 61D for final drying is conveyed from the outlet gate 72 to the outside of the drying chamber 60. Further, the undried object W to be dried is conveyed from the inlet gate 71 to the drying zone 61A where the first drying is performed.

As described above, in the drying apparatus 10 of the first embodiment, by providing suction zones 62A, 62B, 62C between the drying zones 61A, 61B, 61C, 61D, the heating region of the object to be dried W and for drying are provided. It can be separated from the gas recovery area. That is, the drying zones 61A, 61B, 61C, and 61D have only a function of ejecting a drying gas for drying the object W to be dried.

As a result, it is possible to prevent the drying gas ejected from the drying gas ejection nozzle 100 and the lower ejection portion 110 from being sucked from the suction port 63 without contributing to the heating of the object W to be dried. Therefore, the temperature distribution of the drying gas in the drying zones 61A, 61B, 61C, and 61D can be made uniform, and the calorific value of the drying gas can be effectively used.

Further, by separating the heating region of the object W to be dried and the recovery region of the drying gas, in the drying zones 61A, 61B, 61C and 61D which are the heating regions, the object W to be dried is above, sideways and below. The drying gas can be introduced from.

Then, in the drying zones 61A, 61B, 61C, and 61D, the drying gas was ejected from the lower ejection portion 110 while being heated by colliding the drying gas with the object to be dried W from above and from the side by the drying gas ejection nozzle 100. The drying gas can be heated by colliding with the object to be dried W from below.

As a result, the entire surface of the object to be dried W can be uniformly heated. Therefore, the drying time can be shortened. Further, by introducing the drying gas from above, sideways and below the object W to be dried, the temperature distribution in the drying zones 61A, 61B, 61C and 61D can be further made uniform.

Further, by providing the drying gas ejection nozzle 100 in the vicinity of the inlet gate 71 and the outlet gate 72, it is possible to suppress the inflow of air (outside air) from the outside into the drying chamber 60 when these gates are opened. it can.

Here, in the above-described first embodiment, the drying gas ejection nozzle 100 composed of a tubular tube has been described as an example, but the configuration of the drying gas ejection nozzle 100 is not limited to this. The drying gas ejection nozzle 100 may be configured in a slit shape, for example.

FIG. 5 is a perspective view showing the structure of the slit-shaped drying gas ejection nozzle 100. Here, FIG. 5 shows a part of the slit-shaped drying gas ejection nozzle 100 provided on the inner surface 81a of the drying zone 61A. The structure of the slit-shaped drying gas ejection nozzle 100 is the same in the other drying zones 61B, 61C, and 61D.

The drying gas ejection nozzle 100 is provided so as to project from the inner surface 81a into the drying zone 61A. The drying gas ejection nozzle 100 is provided on the inner surface 81a in the transport direction. The drying gas ejection nozzle 100 communicates with the space 90 and ejects the drying gas in the space 90 into the drying zone 61A.

Although FIG. 5 shows a single-stage drying gas ejection nozzle 100, the drying gas ejection nozzles 100 are arranged in a plurality of stages in the height direction (vertical direction), for example. The arrangement configuration of the drying gas ejection nozzle 100 is not particularly limited. In the drying zone 61A, the drying gas ejection nozzle 100 may be arranged so that the drying gas can be blown onto the object W to be dried.

The drying gas ejection nozzle 100 is configured by combining two L-shaped rod-shaped members 160 having an L-shaped cross section perpendicular to the transport direction. That is, the drying gas ejection nozzle 100 is composed of a pair of L-shaped rod-shaped members 160.

The L-shaped rod-shaped member 160 has a long side portion 161 and a short side portion 162. The long side portion 161 is fixed to the inner surface 81a.

In the cross section perpendicular to the transport direction, the short side portion 162 intersects the long side portion 161 at a right angle, for example. As a result, the drying gas ejected from the drying gas ejection nozzle 100 collides perpendicularly with the conveyed object W to be dried.

Then, the short side portions 162 of the pair of L-shaped rod-shaped members 160 face each other to form a protruding portion protruding toward the drying zone 61A. The drying gas is ejected into the drying zone 61A through the slit 163 formed between the short side portions 162.

Here, by appropriately adjusting the width of the slit 163 (distance between the short side portions 162), the flow velocity of the drying gas ejected from the drying gas ejection nozzle 100 can be adjusted.

A stop plate 164 is sandwiched between both short side portions 162 of the L-shaped rod-shaped member 160 in the transport direction in order to prevent the drying gas from being ejected in the transport direction.

Further, in the first embodiment described above, an example in which the transport device 150 performs the tact operation is shown, but the present invention is not limited to this. The object W to be dried may be continuously conveyed in, for example, the drying zones 61A, 61B, 61C, 61D and the suction zones 62A, 62B, 62C by the conveying device 150 at a predetermined speed.

Here, in the above-described first embodiment, an example is shown in which the drying gas ejection nozzles 100 are provided on the inner surfaces 81a, 82a, 83a in the drying zones 61A, 61B, 61C, 61D, but the configuration is limited to this. I can't.

In the drying zones 61A, 61B, 61C, 61D, the drying gas ejection nozzle 100 may be provided only on the inner surface 81a of the side wall 81 and the inner surface 82a of the side wall 82. Further, in the drying zones 61A, 61B, 61C, 61D, the drying gas ejection nozzle 100 may be provided only on the inner surface 83a of the upper wall 83.

In any case, by separating the heating region of the object to be dried W and the recovery region of the drying gas, the temperature distribution of the drying gas in the drying zones 61A, 61B, 61C, and 61D can be made uniform. At the same time, the calorific value of the drying gas can be effectively used.

(Second Embodiment)
FIG. 6 is a diagram showing a cross section corresponding to the cross section of the drying device 10 shown in FIG. 2 in the drying device 10A of the second embodiment. FIG. 7 is a diagram showing a cross section corresponding to the cross section of the drying device 10 shown in FIG. 3 in the drying device 10A of the second embodiment. In the second embodiment, the same components as those in the embodiment are designated by the same reference numerals, and duplicate description will be omitted or simplified.

Here, FIG. 6 basically has a cross-sectional structure obtained by rotating the cross-sectional structure shown in FIG. 2 by 180 degrees around the center of the cross-section. Further, FIG. 7 basically has a cross-sectional structure obtained by rotating the cross-sectional structure shown in FIG. 3 by 180 degrees around the center of the cross-section.

Here, a specific configuration of the drying chamber 60 will be described.

The drying chamber 60 includes, for example, an outer casing 70 and an inner casing 80 inside the outer casing 70, as shown in FIG. Then, the U-shaped opening side of the inner casing 80 is connected to the upper wall 70c of the outer casing 70. That is, as shown in FIG. 6, a space surrounded by the inner casing 80 and the upper wall 70c of the outer casing 70 is formed. In FIG. 6, this space is the drying zone 61A.

Further, a space 90 is formed between the outer casing 70 and the inner casing 80, and the drying gas is introduced into the space 90 via the introduction pipe 31.

As shown in FIG. 6, the space 90 is a space that communicates from the lower part of the drying chamber 60 to both sides. In the cross section shown in FIG. 6, the space 90 is a U-shaped space. That is, the space 90 is formed by extending this U-shaped space in the transport direction.

Here, the object to be dried W is transported by the transport device 180, for example, as shown in FIG. The transport device 180 is composed of, for example, a suspension type transport device that suspends and transports the object to be dried W. The transport device 180 includes a chain 181, a guide casing 182, and a hanging portion 183.

The chain 181 is provided over the transport direction under a predetermined tension. The chain 181 is wound around a sprocket (not shown) and advances in the transport direction by the rotation of the sprocket. The sprocket is rotationally driven by a driving device.

The circumference of the chain 181 is surrounded by a tubular guide casing 182. The guide casing 182 is provided along the extending direction of the chain 181. The bottom of the guide casing 182 has a slit-shaped opening 182a along the transport direction.

One end of the hanging portion 183 is fixed to the chain 181. The other end side of the hanging portion 183 is suspended downward from the guide casing 182 via the opening 182a. The other end of the hanging portion 183 is composed of, for example, a U-shaped hooking member 183a so as to support the object to be dried W.

Then, the hooking member 183a is engaged with the hooking portion 184 of the object to be dried W, and the hanging portion 183 supports the object to be dried W. By rotating the sprocket, the chain 181 moves in the transport direction, and the object to be dried W supported by the hanging portion 183 is transported.

The configuration of the transport device 180 is not limited to this. The transport device 180 may have a configuration in which the object to be dried W can be moved while being suspended.

Next, the configurations of the drying zones 61A, 61B, 61C, and 61D will be described. Since the configurations of the drying zones 61A, 61B, 61C, and 61D are the same, the configuration of the drying zones 61A will be described here.

As shown in FIG. 6, a drying gas ejection nozzle 100 is provided on the inner surfaces 81a and 82a of the side walls 81 and 82 of the inner casing 80 constituting the drying zone 61A.

Further, a drying gas ejection nozzle 100 is provided on the inner surface 84a of the bottom wall 84 of the inner casing 80. The drying gas ejection nozzle 100 is provided so as to project from the inner surface 84a into the drying zone 61A. The drying gas ejection nozzle 100 is provided, for example, perpendicular to the inner surface 84a. The drying gas ejection nozzles 100 on the bottom wall 84 are also arranged in a houndstooth pattern like the drying gas ejection nozzles 100 on the side walls 81 and 82.

The arrangement configuration of the drying gas ejection nozzle 100 on the side walls 81, 82 and the bottom wall 84 of the inner casing 80 is not particularly limited, and is not limited to the above configuration.

Further, as shown in FIG. 6, an upper ejection portion 170 is provided on both side walls 81 and 82 of the drying zone 61A on the upper side of the object to be dried W to be transported. That is, the upper ejection portion 170 is provided above the drying gas ejection nozzle 100 provided on both side walls 81 and 82 of the drying zone 61A.

The upper ejection portion 170 has the same configuration as the lower ejection portion 110 of the first embodiment. The upper ejection portion 170 includes an opening 171 formed in the side walls 81 and 82, and a blowout lead-out plate 172 provided in the opening 171.

Further, the opening 171 has the same configuration as the opening 111 of the first embodiment. The blowout lead-out plate 172 has the same configuration as the blowout lead-out plate 112 of the first embodiment. Therefore, the description of the opening 171 and the blowout lead-out plate 172 will be omitted here.

A part of the drying gas introduced into the space 90 passes between the opening 171 and the blowout lead-out plate 172 and is ejected into the drying zone 61A. The drying gas ejected from the upper ejection portion 170 collides with the object to be dried W from above.

By providing the upper ejection portion 170, it is possible to make the temperature distribution of the drying gas in the drying zone 61A uniform. Further, by colliding the drying gas with the object W to be dried from the upper side, for example, in the case of a structure in which the object W to be dried opens upward, the gas for drying can be introduced inside the object W to be dried. .. As a result, the object to be dried W can be uniformly dried.

Next, the configurations of the suction zones 62A, 62B, and 62C will be described. Since the configurations of the suction zones 62A, 62B, and 62C are the same, the configuration of the suction zones 62A will be described here.

The suction zone 62A is formed between the drying zone 61A and the drying zone 61B.

As shown in FIG. 7, the suction zone 62A is formed in a space surrounded by the inner casing 80, the side walls 64 and 65 having the suction port 63, and the upper wall 70c of the outer casing 70.

Here, the configurations of the spaces 68, 69, the side walls 64, 65, the suction port 63, and the opening degree adjusting unit 120 are the same as those in the first embodiment.

There is a gap (space) between the upper wall portions 66c and 67c of the recesses 66 and 67 and the upper wall 70c of the outer casing 70. That is, the drying gas guided into the space 90 can spread in the width direction of the drying chamber 60 (left-right direction in FIG. 7) in the upper part of the drying chamber 60. As a result, the flow rate distribution of the drying gas ejected from the upper ejection portion 170 of the adjacent drying zones 61A, 61B, 61C, 61D can be made uniform.

One end of a return pipe 35 for returning the drying gas guided to the spaces 68 and 69 into the combustion casing 21 of the combustor 20A is connected to, for example, the upper part of the inner casing 80 constituting the spaces 68 and 69. ing.

Since the operation of the drying device 10A is the same as the operation of the drying device 10 of the first embodiment, the description thereof will be omitted here.

As described above, in the drying apparatus 10A of the second embodiment, by providing suction zones 62A, 62B, 62C between the drying zones 61A, 61B, 61C, 61D, the heating region of the object to be dried W and the drying zone are provided. It can be separated from the gas recovery area. That is, the drying zones 61A, 61B, 61C, and 61D have only a function of ejecting a drying gas for drying the object W to be dried.

As a result, it is possible to prevent the drying gas ejected from the drying gas ejection nozzle 100 and the upper ejection portion 170 from being sucked from the suction port 63 without contributing to the heating of the object W to be dried. Therefore, the temperature distribution of the drying gas in the drying zones 61A, 61B, 61C, and 61D can be made uniform, and the calorific value of the drying gas can be effectively used.

Further, by separating the heating region of the object W to be dried and the recovery region of the drying gas, in the drying zones 61A, 61B, 61C and 61D which are the heating regions, the object W to be dried is above, sideways and below. The drying gas can be introduced from.

Then, in the drying zones 61A, 61B, 61C, and 61D, the drying gas was ejected from the upper ejection portion 170 while being heated by colliding the drying gas with the object to be dried W from below and from the side by the drying gas ejection nozzle 100. The drying gas can be heated by colliding with the object to be dried W from above.

As a result, the entire surface of the object to be dried W can be uniformly heated. Therefore, the drying time can be shortened. Further, by introducing the drying gas from above, sideways and below the object W to be dried, the temperature distribution in the drying zones 61A, 61B, 61C and 61D can be further made uniform.

Also in the second embodiment, the slit-shaped drying gas ejection nozzle 100 shown in FIG. 5 can be applied.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

10, 10A ... drying device, 20 ... heat source, 20A ... combustor, 21 ... combustion casing, 21a ... one end, 21b ... other end, 22 ... burner, 23 ... fuel supply system, 24 ... air supply system, 24a ... intake Fan, 25 ... Fuel supply source, 30, 36, 37 ... Piring, 31 ... Introduction piping, 32 ... Circulation fan, 32a ... Fan motor, 35 ... Return piping, 36a ... Exhaust fan, 37a ... Flow control unit, 40 ... Filter Part, 41 ... Casing, 42 ... Filter, 43 ... Differential pressure gauge, 60 ... Drying chamber, 61A, 61B, 61C, 61D ... Drying zone, 62A, 62B, 62C ... Suction zone, 63 ... Suction port, 64, 65, 70a , 81, 82 ... Side wall, 66, 67 ... Recessed, 66a, 67a, 66b, 67b ... Wall, 68, 69, 90 ... Space, 70 ... External casing, 70b, 84 ... Bottom wall, 71 ... Entrance gate, 71a ... entrance door, 71b, 72b, 122 ... downward slide member, 71c, 72c, 123 ... upward slide member, 72 ... exit gate, 72a ... exit door, 80 ... internal casing, 81a, 82a, 83a ... inner surface, 70c, 83. ... Upper wall, 100 ... Drying gas ejection nozzle, 110 ... Lower ejection part, 111, 171, 182a ... Opening, 112, 172 ... Derivation plate, 120 ... Opening adjustment unit, 121 ... Adjustment door, 150, 180 ... Conveyor device, 151 ... rail, 152 ... drive unit, 153 ... support part, 160 ... L-shaped rod-shaped member, 161 ... long side part, 162 ... short side part, 163 ... slit, 164 ... stop plate, 170 ... upper ejection Part, 181 ... Chain, 182 ... Guide casing, 183 ... Suspended part, 183a ... Hooking member, 184 ... Hooking part, W ... Dried object.

Claims (14)

A drying device that dries the object to be dried by ejecting a drying gas onto the object to be dried.
A heat source that generates a drying gas that dries the object to be dried,
A plurality of drying zones provided in the transport direction of the object to be dried and drying the object to be dried for a predetermined time,
An ejection part provided in each of the drying zones and ejecting a drying gas generated in the heat source portion toward the object to be dried,
A drying device provided between the drying zones and provided with a suction zone having a suction port for sucking the drying gas ejected into the drying zone back to the heat source portion. The drying apparatus according to claim 1, wherein the drying zone and the suction zone are formed in a cylinder having a side wall, an upper wall, and a bottom wall. The drying apparatus according to claim 2, wherein the ejection portion is provided on the side wall of the drying zone. The drying apparatus according to claim 2 or 3, wherein the ejection portion is provided on the upper wall of the drying zone. The side wall of the drying zone is further provided with a lower ejection portion which is provided below the object to be transported and ejects the drying gas generated in the heat source portion into the drying zone. The drying apparatus according to any one of claims 2 to 4. The drying apparatus according to claim 5, wherein the outlet opening of the lower ejection portion is provided with an outlet lead-out plate capable of adjusting the ejection direction of the drying gas. The drying apparatus according to claim 5 or 6, wherein the ejection portion is arranged above the lower ejection portion on the side wall of the drying zone. The drying apparatus according to claim 2 or 3, wherein the ejection portion is provided on the bottom wall of the drying zone. The side wall of the drying zone is further provided with an upper ejection portion which is provided above the object to be transported and ejects the drying gas generated in the heat source portion into the drying zone. The drying apparatus according to any one of claims 2, 3 and 8. The drying apparatus according to claim 9, wherein the outlet opening of the upper ejection portion is provided with an outlet lead-out plate capable of adjusting the ejection direction of the drying gas. The drying apparatus according to claim 9 or 10, wherein the ejection portion is arranged below the upper ejection portion in the side wall of the drying zone. The drying apparatus according to any one of claims 2 to 11, wherein the suction port is provided on the side wall of the suction zone. The drying apparatus according to any one of claims 1 to 12, wherein the ejection portion is formed of a tubular tube. The drying apparatus according to any one of claims 1 to 12, wherein the ejection portion is formed in a slit shape.

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