JP6853577B2 - Drying device - Google Patents

Description

Embodiments of the present invention relate to a drying device.

As a conventional drying device, there is a gas ejection type drying device in which a drying gas is ejected at a high speed 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 vertically with the object to be dried at high speed.

As the drying gas, for example, a high temperature gas is used when heating to dry the object to be dried, and for example, a low temperature gas is used when cooling to dry the object to be dried. ..

The gas ejection type drying apparatus includes a plurality of ejection nozzles for ejecting drying gas. This ejection nozzle is configured by forming a plurality of ejection holes on the side wall of the tubular outlet duct, for example.

In such a conventional gas ejection type drying device, the drying gas is introduced into a wide space in the blowout duct after the flow rate is adjusted. Then, the drying gas introduced into the wide space in the blowing duct is ejected from the ejection nozzle toward the object to be dried.

Japanese Patent No. 4701224

In the conventional gas ejection type drying device as described above, the drying gas introduced into the blowing duct spreads unevenly in the space inside the blowing duct. Then, the pressure of the drying gas in the blowout duct becomes non-uniform and has a pressure distribution.

Therefore, the flow rate of the drying gas ejected from each ejection nozzle is not constant. That is, the ejection speed of the drying gas ejected from each ejection nozzle is not constant. Therefore, temperature spots occur on the object to be dried, and proper drying treatment cannot be performed.

Further, it is conceivable to equip each ejection nozzle with a flow rate adjusting mechanism so that the flow rate of the drying gas introduced into each ejection nozzle is constant, but this is not realistic because the structure of the apparatus becomes complicated.

An object to be solved by the present invention is to provide a drying device capable of maintaining a constant flow rate (flow velocity) of a drying gas ejected from each ejection nozzle.

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 gas ejection part main body provided along the transport direction of the object to be dried, and
A second space is provided inside the main body of the gas ejection portion along the transport direction of the object to be dried, and the internal space of the main body of the gas ejection portion is different from the first space on the transport path side of the object to be dried and the second on the side different from the transport path side. With respect to each of the inner wall in which a plurality of openings formed to communicate the first space and the second space and the plurality of openings formed in the inner wall are formed. A partition wall that divides the first space into a plurality of individual spaces, a partition wall that communicates with the individual spaces, is provided so as to project from the side wall of the gas jetting portion main body toward the transport path side, is composed of a tubular tube, and is used as an object to be dried. It includes a drying gas ejection nozzle that forms a jet of drying gas to collide with, and an opening degree adjusting unit that adjusts the opening degree of each opening of the inner wall . The gas ejection portion main body is a cylindrical casing having an outer peripheral surface along the transport direction of the object to be dried, and the inner wall is a cylindrical body provided inside the gas ejection portion main body, and the partition wall. Is a plate-shaped member that partitions the first space between the gas ejection portion main body and the inner wall in the axial direction of the gas ejection portion main body .

According to the drying apparatus of the present invention, the flow rate (flow velocity) of the drying gas ejected from each ejection nozzle can be maintained uniformly.

It is a figure which showed typically the outline of the drying apparatus of 1st Embodiment. It is a perspective view of a gas ejection part. It is a figure when the vertical cross section of a gas ejection part is seen from the longitudinal direction (extension direction) of a gas ejection part. It is a figure when the horizontal cross section of a gas ejection part is seen from above. It is a figure which showed typically the outline of the drying apparatus of 2nd Embodiment. It is a figure which shows the CC cross section of FIG. It is a perspective view of the gas ejection part of the drying apparatus of 3rd Embodiment. It is an enlarged plan view of a part of the drying gas ejection nozzle when the drying gas ejection nozzle is seen from the drying space side.

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 of the first embodiment.

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

The combustion chamber 20 is a housing having an internal space. A burner 30 is provided at one end 20a of the combustion chamber 20. The burner 30 includes a fuel supply system 31 for supplying fuel and an air supply system 32 for supplying air. Here, an example in which the air supply system 32 is provided with the intake fan 32a is shown.

In the burner 30, the combustion gas generated by burning the fuel supplied from the fuel supply system 31 and the air supplied from the air supply system 32 spreads inside the combustion chamber 20. This combustion gas functions as a drying gas for drying the object to be dried W.

The other end 20b of the combustion chamber 20 has an outlet opening (not shown) for discharging the internal combustion gas. Further, on the other end 20b side of the combustion chamber 20, for example, as shown in FIG. 1, a filter 21 is provided over a cross section. The filter 21 removes foreign matter in the combustion gas flowing toward the outlet opening.

The drying chamber 60 dries the object to be dried W by the drying gas discharged from the combustion chamber 20. As shown in FIG. 1, the drying chamber 60 extends in the transport direction of the object to be dried W, for example. Note that FIG. 1 is a view of the horizontal cross section of the drying chamber 60 as viewed from above.

The drying chamber 60 includes a casing 61, a transport device 62, and a gas ejection unit 70.

The casing 61 constitutes the outer shell of the drying chamber 60. When the drying chamber 60 is extended in the transport direction of the object to be dried W as shown in FIG. 1, the casing 61 has a tubular shape.

The transport device 62 moves the object to be dried W to be dried in the drying chamber 60. The transport device 62 is provided, for example, in the center of the drying chamber 60 in the width direction over the extending direction of the drying chamber 60. The transport device 62 is composed of, for example, a conveyor chain or the like. The object to be dried W is arranged on the transport device 62.

The gas ejection unit 70 ejects a drying gas onto the object W to be dried. As shown in FIG. 1, the gas ejection portion 70 is provided along the transport direction of the object to be dried W.

Gas ejection portions 70 are provided on both sides of the drying chamber 60 in the extending direction of the drying chamber 60 so as to sandwich the transport device 62, for example. Although an example in which the two gas ejection portions 70 are arranged to face each other is shown here, only one of the gas ejection portions 70 may be used.

Further, an example is shown in which the gas ejection portion 70 is provided along the side wall of the casing 61 of the drying chamber 60, but the arrangement is not limited to this. For example, the gas ejection portion 70 may be provided above or below the object to be dried W to be conveyed. The structure of the gas ejection portion 70 will be described in detail later.

The gas ejection unit 70 communicates with the combustion chamber 20 via the introduction pipe 80. One end of the introduction pipe 80 is connected to the outlet opening (not shown) of the combustion chamber 20, and the other end of the introduction pipe 80 is connected to the gas ejection portion 70. As shown in FIG. 1, when two gas ejection portions 70 are provided, the introduction pipe 80 is bifurcated so as to be connected to the respective gas ejection portions 70.

Further, the connection portion of the introduction pipe 80 with the gas ejection portion 70 is not limited to one place, and may be a plurality of joint parts. When there are a plurality of connecting portions, the other end side of the introduction pipe 80 is branched into a plurality of connecting portions.

Each of the bifurcated introduction pipes 80 may be provided with, for example, a flow rate adjusting valve for adjusting the flow rate of the drying gas introduced into the gas ejection portion 70.

In the introduction pipe 80, the drying gas is introduced from the combustion chamber 20 to the gas ejection portion 70 via the introduction pipe 80, and the drying gas is returned from the drying chamber 60 to the combustion chamber 20 via the return pipe 85 described later. Therefore, the circulation fan 81 is interposed.

In the circulation fan 81, for example, the flow rate of the drying gas supplied to the gas ejection unit 70 is adjusted by controlling the fan motor 82 to adjust the fan rotation speed. As a result, the speed (flow rate) of the drying gas ejected from the drying gas ejection nozzle 140 is adjusted. The circulation fan 81 is composed of, for example, a sirocco fan or a turbo fan.

Here, as shown in FIG. 1, the branch pipe 100 is branched from the introduction pipe 80 between the branch portion 80a where the introduction pipe 80 is bifurcated and the circulation fan 81. The branch pipe 100 discharges a part of the drying gas flowing through the introduction pipe 80 into the atmosphere.

The branch pipe 100 is provided with a flow rate adjusting unit 101 for adjusting the flow rate of the exhausted drying gas. The flow rate adjusting unit 101 is composed of, for example, a damper or the like. The opening degree of the damper is adjusted so that, for example, a constant flow rate of drying gas is discharged into the atmosphere.

The drying space 63 of the drying chamber 60 communicates with the combustion chamber 20 via the return pipe 85. One end of the return pipe 85 is connected to the casing 61 so as to communicate with the drying space 63 of the drying chamber 60. One end of the return pipe 85 is connected to the upper part of the casing 61 so as to communicate with the drying space 63 of the drying chamber 60, for example.

Here, the drying space 63 is a region for drying the object to be dried W moved by the transport device 62. In the drying chamber 60 shown in FIG. 1, the drying space 63 is formed between the gas ejection portions 70 arranged so as to face each other.

The return pipe 85 is piped so as not to penetrate the gas ejection portion 70. That is, the return pipe 85 is piped so as not to come into contact with the drying gas flowing in the gas ejection portion 70. Here, one end of the return pipe 85 may be branched into a plurality of parts to suck the drying gas from the plurality of positions in the drying space 63.

On the other end side of the return pipe 85, a branch pipe 86 branching from the return pipe 85 is provided. One end of the branch pipe 86 is, for example, open to the atmosphere. The branch pipe 86 is a pipe for introducing the atmosphere (air) into the drying gas returning from the drying chamber 60 to the combustion chamber 20 via the return pipe 85. That is, the atmosphere is sucked from the end of the branch pipe 86 on the open side to the atmosphere and introduced into the return pipe 85.

The branch pipe 86 is provided with a flow rate adjusting unit 87 for adjusting the flow rate of air introduced into the return pipe 85. The flow rate adjusting unit 87 is composed of, for example, a damper or the like. The opening degree of the damper is adjusted so that, for example, a constant flow rate of air is introduced into the return pipe 85.

The other end of the return pipe 85 is connected to the side wall of the combustion chamber 20. As shown in FIG. 1, the side wall position where the other end of the return pipe 85 is connected is, for example, between the filter 21 and the burner 30 in the direction from one end 20a side to the other end 20b side of the combustion chamber 20. Is set. As a result, when the drying gas circulated in the combustion chamber 20 through the return pipe 85 is introduced from the combustion chamber 20 into the introduction pipe 80 again, the foreign matter is removed through the filter 21.

Next, the configuration of the gas ejection unit 70 will be described.

FIG. 2 is a perspective view of the gas ejection portion 70. FIG. 3 is a view when the vertical cross section of the gas ejection portion 70 is viewed from the longitudinal direction (extension direction) of the gas ejection portion 70. FIG. 4 is a view of the horizontal cross section of the gas ejection portion 70 when viewed from above. Note that FIG. 3 is a cross section when the portion shown by the alternate long and short dash line AA in FIG. 2 is cut in the vertical direction. FIG. 4 is a cross section when the portion shown by the alternate long and short dash line BB in FIG. 2 is cut in the horizontal direction.

As shown in FIGS. 2 to 4, the gas ejection unit 70 includes a gas ejection unit main body 110, an inner wall 120, a partition wall 130, a drying gas ejection nozzle 140, and an opening degree adjusting portion 150.

The gas ejection part main body 110 is a box-shaped casing extending along the transport direction of the object to be dried W. That is, the gas ejection part main body 110 extends continuously in the transport direction of the object W to be dried, and has, for example, a rectangular parallelepiped shape. For example, as shown in FIG. 1, by providing the gas ejection portion 70 so as to sandwich the transport device 62, walls by the gas ejection portion 70 are continuously formed on both side portions of the transport device 62 along the transport direction. ..

As described above, the introduction pipe 80 is connected to the gas ejection unit main body 110. The introduction pipe 80 is connected to the gas ejection unit main body 110 so as to introduce the drying gas into the second space 113 described later.

The number of connecting portions of the introduction pipe 80 to the gas ejection portion main body 110 is not limited to one, and may be plural. It is preferable that the connecting portion of the introduction pipe 80 with the gas ejection portion main body 110 is set so that the pressure distribution of the drying gas introduced into the second space 113 of the gas ejection portion main body 110 becomes uniform.

The inner wall 120 is composed of a flat plate-shaped member. As shown in FIGS. 3 and 4, the inner wall 120 is parallel to the side wall 111 on the transport path side (conveyor device 62 side) of the gas ejection portion main body 110, and the drying object W is conveyed inside the gas ejection portion main body 110. It is provided along. In other words, the inner wall 120 has a longitudinal direction of the gas ejection part main body 110 (conveying direction of the object to be dried W) in the gas ejection portion main body 110 so that the surface 120a on the first space 112 side is parallel to the side wall 111. It is provided over.

The inner wall 120 divides the internal space of the gas ejection portion main body 110 into a first space 112 on the transport path side (convey device 62 side) of the object W to be dried and a second space 113 on a side different from the transport path side. are doing.

The distance between the side wall 111 and the inner wall 120 and the distance between the inner wall 120 and the side wall 115 on a side different from the transport path side of the gas ejection part main body 110 are, for example, the second space 113 and the individual described later. It is appropriately set based on the space volume of the space 114 and the like. For example, the inner wall 120 is provided in the center between the side wall 111 and the side wall 115.

The inner wall 120 is formed with a plurality of openings 121 that allow the first space 112 and the second space 113 to communicate with each other. The drying gas introduced into the second space 113 flows out to the first space 112 through the opening 121.

The partition wall 130 is composed of a flat plate-shaped member. As shown in FIGS. 2 to 4, the partition wall 130 partitions the first space 112 into individual spaces 114, which are a plurality of small spaces. The partition wall 130 includes, for example, a vertical partition wall 131 for partitioning the vertical direction and a horizontal partition wall 132 for partitioning the horizontal direction. Here, the vertical partition wall 131 is installed horizontally, and the horizontal partition wall 132 is installed vertically.

That is, the individual space 114 is a cubic or rectangular parallelepiped space surrounded by the inner wall 120, the partition wall 130 (vertical partition wall 131 and the horizontal partition wall 132), and the gas ejection portion main body 110.

Individual spaces 114 are formed for each of the openings 121 formed in the inner wall 120. In other words, one individual space 114 is configured for one opening 121. In order to uniformly expand the drying gas that has passed through the opening 121 into the individual space 114, the opening 121 is preferably formed, for example, in the center of the inner wall 120 surrounding the individual space 114.

The opening degree adjusting unit 150 adjusts the opening degree of the opening 121 of the inner wall 120, and adjusts the flow rate of the drying gas flowing into the individual space 114 from the second space 113. The opening degree adjusting unit 150 includes, for example, a slide member 151 and a support member 152, as shown in FIGS. 3 and 4.

The slide member 151 is composed of, for example, a plate-shaped member. The slide member 151 is configured to have a size larger than that of the opening 121. Therefore, the slide member 151 can also close the opening 121.

The support member 152 slidably supports the slide member 151. The support member 152 is provided, for example, on the surface 120b of the inner wall 120 on the second space 113 side. The support member 152 is composed of a rail-shaped member that supports the slide member 151 from above and below.

That is, the support member 152 is configured to include a set of rod-shaped members at the upper position and the lower position of the opening 121. Here, the upper direction is the vertical upward direction, and the lower direction is the vertical downward direction.

Specifically, the support member 152 is composed of, for example, a rod-shaped member having an L-shaped cross section perpendicular to the longitudinal direction of the gas ejection portion 70. The support member 152 is fixed in the longitudinal direction of the gas ejection portion 70, for example, at the upper position and the lower position of the opening 121 on the surface 120b of the inner wall 120. At this time, for example, the end surface 152b of the L-shaped short side portion 152a is connected to the surface 120b.

In the cross section shown in FIG. 3, the upper end portion and the lower end portion of the slide member 151 are slidably engaged with the U-shaped engaging groove 153 formed by the L-shaped support member 152 and the inner wall 120. ing. As a result, the opening degree of the opening 121 can be adjusted by sliding the slide member 151.

Although not shown, the side wall 115 of the gas ejection portion main body 110 is provided with an inspection port for adjusting the opening degree adjusting portion 150 and an openable / closable lid portion for closing the inspection port.

Here, the opening degree of each opening 121 is adjusted so that the flow rate of the drying gas flowing into each individual space 114 becomes uniform. Specifically, the opening degree of the opening 121 is, for example, the opening area of the opening 121 of the portion not closed by the slide member 151 and the average flow velocity of the drying gas passing through the opening. Adjusted based on flow rate.

That is, the opening degree of the opening 121 is adjusted based on the calculated flow rate of the drying gas so that the flow rate of the drying gas passing through the opening and flowing into each individual space 114 becomes uniform.

The opening degree of each opening 121 is adjusted in advance before the actual drying processing operation is performed in the drying device 10. At this time, the opening degree of each opening 121 is adjusted under the condition that the flow rate of the drying gas introduced into the second space 113 of the gas ejection part main body 110 during the actual drying process is assumed.

The average flow velocity can be obtained, for example, by measuring the flow velocity at a plurality of locations in the opening and arithmetically averaging the measured flow velocity. Further, the flow velocity of the drying gas is measured by, for example, a hot wire anemometer or the like.

The drying gas ejection nozzle 140 is provided so as to project from the side wall 111 of the gas ejection portion main body 110 toward the transport path side. The drying gas ejection nozzle 140 communicates with the individual space 114 and ejects the drying gas in the individual space 114 into the drying space 63 (transport path side).

The drying gas ejection nozzle 140 is arranged on the side wall 111 of the gas ejection portion main body 110 facing the inner wall 120 in which the opening 121 is formed. Here, the inner wall 120 and the side wall 111 are arranged so as to face each other in parallel with the individual space 114 interposed therebetween.

Here, in order to improve the heat transfer between the drying gas ejected from the drying gas ejection nozzle 140 and the object W to be dried, for example, the object W to be dried is conveyed to the drying gas ejection nozzle 140. It is preferably arranged so as to be perpendicular to the direction. That is, it is preferable that the drying gas ejection nozzle 140 is arranged so as to vertically collide with the object to be dried W to which the ejected drying gas is conveyed.

Further, in order to improve the heat transfer described above, for example, the higher the flow velocity of the drying gas ejected from the drying gas ejection nozzle 140, the more preferable.

A plurality of drying gas ejection nozzles 140 are arranged, for example, in one individual space 114. When a plurality of drying gas ejection nozzles 140 are provided, the arrangement position is not particularly limited, but the drying gas introduced into the individual space 114 is arranged at a position where it can be ejected at a uniform speed (flow rate). ..

Here, in order to improve the heat transfer coefficient, the flow of the drying gas ejected from the drying gas ejection nozzle 140 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 140 is formed of, for example, a tubular tube or the like, which easily forms such a jet. As the tubular tube, for example, a circular tube or the like is used.

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

At the start of operation of the drying device 10, the intake fan 32a and the circulation fan 81 are driven.

When the combustion in the burner 30 starts, the drying gas (combustion gas) in the burner 30 is sucked into the introduction pipe 80 by the suction of the circulation fan 81. The drying gas sucked into the introduction pipe 80 is introduced into the gas ejection portion 70 of the drying chamber 60.

Specifically, the drying gas sucked into the introduction pipe 80 is introduced into the second space 113 in the gas ejection portion main body 110 in the gas ejection portion 70. At this time, a predetermined amount of the drying gas flowing through the introduction pipe 80 is discharged to the atmosphere through the branch pipe 100.

The drying gas introduced into the second space 113 spreads in the second space 113. Then, the drying gas spread in the second space 113 flows into each individual space 114 through the opening 121 of the inner wall 120. At this time, the flow rate of the drying gas flowing into each individual space 114 is adjusted by the opening degree adjusting unit 150 so as to be uniform.

The drying gas that has flowed into the individual space 114 spreads uniformly in the individual space 114. Here, since the individual space 114 is a small space, the inflowing drying gas tends to spread uniformly. Then, the drying gas spread in the individual space 114 is ejected from the drying gas ejection nozzle 140 into the drying space 63.

At this time, the drying gas that has passed through the opening 121 spreads uniformly in all directions. Therefore, the pressure distribution of the drying gas in the individual space 114 is small and substantially uniform. For example, when the opening 121 is formed in the center of the inner wall 120 surrounding the individual space 114, the drying gas that has passed through the opening 121 tends to spread uniformly in the individual space 114.

Further, the drying gas ejection nozzle 140 is arranged on the side wall 111 of the gas ejection portion main body 110 facing the inner wall 120 in which the opening 121 is formed. Therefore, the dynamic pressure of the flow of the drying gas flowing while uniformly spreading in all directions from the central opening 121 of the inner wall 120 toward the side wall 111 side also acts uniformly on each drying gas ejection nozzle 140.

As a result, the pressure difference between the pressure of the communication portion with each drying gas ejection nozzle 140 in the individual space 114 and the pressure in the drying space 63 becomes approximately the same. Therefore, the flow rates of the drying gas flowing from the individual space 114 into each drying gas ejection nozzle 140 are substantially equal. Further, the flow velocities of the drying gas ejected from the drying gas ejection nozzles 140 provided for one individual space 114 are substantially equal to each other. The dimensions such as the flow path diameter of each drying gas ejection nozzle 140 are the same.

Further, the flow rate of the drying gas flowing into each individual space 114 is set to be uniform. Therefore, even the flow rates (flow velocities) of the drying gas ejected from the drying gas ejection nozzles 140 provided for the different individual spaces 114 are substantially the same.

The drying gas ejected into the drying space 63 collides with the object to be dried W moved by the transport device 62. Since the flow velocity of the drying gas ejected from each drying gas ejection nozzle 140 is substantially uniform, the object to be dried W can be heated uniformly.

Further, since the flow of the drying gas ejected from each drying gas ejection nozzle 140 is suppressed from spreading in the direction perpendicular to the ejection direction and is high speed, heat transfer is improved. Therefore, the amount of heat of the drying gas can be efficiently transferred to the object to be dried W.

Here, since the gas ejection unit main body 110 extends continuously in the transport direction of the object W to be dried, for example, the drying gas ejected from each drying gas ejection nozzle 140 is the gas ejection portion main body. It does not flow into the rear of 110. That is, the drying gas ejected from each drying gas ejection nozzle 140 exists in the drying space 63 even after the collision with the object to be dried W, and contributes to the heating of the object to be dried W.

Since the drying gas in the combustion chamber 20 is sucked by the circulation fan 81, the pressure in the combustion chamber 20 is lower than the pressure in the drying space 63 of the drying chamber 60. Therefore, the drying gas in the drying space 63 is guided to the combustion chamber 20 through the return pipe 85.

At this time, as described above, air is also sucked from the end of the branch pipe 86 on the open side to the atmosphere. Then, a predetermined amount of air is introduced into the return pipe 85 through the branch pipe 86 and guided to the combustion chamber 20.

The drying gas and air introduced into the combustion chamber 20 via the return pipe 85 are mixed with the combustion gas generated by the combustion in the burner 30, sucked into the introduction pipe 80, and introduced into the gas ejection portion 70 of the drying chamber 60. be introduced.

In this way, a part of the drying gas generated in the combustion chamber 20 is circulated to the combustion chamber 20 via the drying chamber 60.

Here, the flow rate of the air introduced through the branch pipe 86 is the same as the flow rate of the combustion gas discharged into the atmosphere through the branch pipe 100.

Introducing the atmosphere from the branch pipe 86 and discharging a part of the drying gas from the branch pipe 100 suppresses an increase in the concentration of volatile organic compounds (VOC) in the circulation system of the drying gas. Because. This makes it possible to prevent accidents such as explosions. The volatile organic compound is contained in, for example, a paint.

As described above, in the drying apparatus 10 of the first embodiment, the internal space of the gas ejection part main body 110 is the first space 112 on the transport path side of the object W to be dried and the second space on a side different from the transport path side. An inner wall 120 that partitions the space 113 is provided along the transport direction of the object W to be dried. The inner wall 120 is formed with a plurality of openings 121 that allow the first space 112 and the second space 113 to communicate with each other. Further, the first space 112 is divided into a plurality of individual spaces 114 by partition walls 130 (longitudinal partition wall 131 and horizontal partition wall 132) for each opening.

By providing the opening degree adjusting unit 150 in the gas ejection unit main body 110 having such a configuration, a uniform flow rate of drying gas can be introduced from the second space 113 into each individual space 114.

Further, by introducing the drying gas into the individual space 114 partitioned into the small space through the opening 121, the flow of the drying gas spreads throughout the individual space 114. As a result, the pressure distribution of the drying gas in the individual space 114 can be reduced, and a substantially uniform pressure distribution can be obtained. Further, by providing the opening 121 in the center of the inner wall 120 surrounding the individual space 114, a more uniform pressure distribution can be obtained in the individual space 114.

Further, the side wall 111 of the gas ejection part main body 110 provided with the drying gas ejection nozzle 140 faces the inner wall 120 in which the opening 121 is formed. Therefore, the dynamic pressure of the flow of the drying gas flowing from the central opening 121 of the inner wall 120 toward the side wall 111 side also acts uniformly on each drying gas ejection nozzle 140.

Therefore, the flow rates of the drying gas flowing from the individual spaces 114 into the drying gas ejection nozzles 140 are substantially equal, and the flow velocities of the drying gas ejected from the drying gas ejection nozzles 140 are substantially equal.

As a result, the object to be dried W moved by the transport device 62 can be uniformly heated.

(Second Embodiment)
FIG. 5 is a diagram schematically showing an outline of the drying device 11 of the second embodiment. FIG. 6 is a diagram showing a CC cross section of FIG. The same components as those of the drying device 10 of the first embodiment are designated by the same reference numerals, and duplicate description will be omitted or simplified.

In the drying apparatus 11 of the second embodiment, the configuration of the drying chamber 160 is different from the configuration of the drying chamber 60 of the first embodiment. Therefore, here, the configuration of the drying chamber 160 in the second embodiment will be mainly described.

In the drying chamber 160 in the drying apparatus 11 of the second embodiment, the object to be dried W is rotated and conveyed to be dried.

As shown in FIG. 5, the drying device 11 includes a combustion chamber 20 and a drying chamber 160 for drying the object to be dried W with the drying gas discharged from the combustion chamber 20. The drying device 11 is a circulation type drying device that introduces the combustion gas generated in the combustion chamber 20 into the drying chamber 160 and returns a part of the combustion gas introduced into the drying chamber 160 to the combustion chamber 20.

The drying chamber 160 includes a tubular casing 161 and is installed in a plurality of stages in the vertical direction as shown in FIG. The casing 161 constitutes the outer shell of the drying chamber 160. The casing 161 extends in the vertical direction. In each drying chamber 160, a drying space 63 is provided in the casing 161.

As shown in FIG. 5, the casing 161 has, for example, a circular cross section (hereinafter, referred to as a horizontal cross section) perpendicular to the axial direction of the casing 161. The shape of the horizontal cross section of the casing 161 is not limited to a circle, but may be a polygon. The axial direction of the casing 161 is the vertical direction.

As shown in FIG. 5, the side wall 162 of the casing 161 is carried in and out for arranging the object to be dried W at a predetermined position in the drying chamber 160 and taking out the object to be dried W from the drying chamber 160. The mouth 163 is formed. Further, the side wall 162 of the casing 161 is provided with a slide door 164 for opening and closing the carry-in / carry-out entrance 163.

The sliding door 164 is configured to be slidable in the horizontal direction. The slide door 164 is opened, and the object to be dried W after drying is taken out from the drying chamber 160 through the carry-in / carry-out inlet 163, or the object to be dried W is arranged in the drying chamber 160 for drying.

The carry-in / carry-out entrance 163 and the slide door 164 are provided for each drying chamber 160 in each stage.

The drying chamber 60 further includes a transport device 170 and a gas ejection unit 180.

The transport device 170 rotates and transports the object to be dried W to be dried around the gas ejection portion 180. The transport device 170 includes a rotary plate 171 on which the object to be dried W is arranged, and a drive mechanism (not shown) for rotationally driving the rotary plate 171.

The rotating plates 171 of each stage are fixed in parallel with each other at regular intervals in the vertical direction. The upper and lower rotating plates 171 are fixed in parallel with each other by a support member (not shown). Then, when the lowermost rotary plate 171 is rotated by the power of, for example, a drive motor (not shown) which is a drive mechanism, the rotary plate 171 of each stage also rotates at the same time.

The rotary plate 171 is configured to be rotatable between the gas ejection portion 180 and the side wall 162 of the casing 161 in the circumferential direction of the gas ejection portion 180, for example, clockwise. As a result, the object to be dried W arranged on the rotating plate 171 is rotationally conveyed around the gas ejection portion 180.

The annular space surrounded by the rotating plates 171 arranged in the vertical direction and between the casing 161 and the gas ejection portion 180 is a space constituting a transport path and functions as a drying space 63.

As shown in FIGS. 5 and 6, the gas ejection unit 180 includes a gas ejection unit main body 190, an inner wall 200, a partition wall 210, a drying gas ejection nozzle 220, and an opening degree adjusting portion 230.

The gas ejection part main body 190 is a cylindrical casing having an outer peripheral surface along the transport direction of the object W to be dried. The gas ejection portion main body 190 extends inside the side wall 162 of the casing 161 along the axial direction of the casing 161. A double pipe structure is formed by the casing 161 and the gas ejection portion main body 190.

The gap between the side wall 162 of the casing 161 and the gas ejection portion main body 190 is uniform in the circumferential direction. Further, the casing 161 and the gas ejection part main body 190 have a central axis concentrically.

An introduction pipe 80 is connected to the gas ejection part main body 190. The introduction pipe 80 is connected to the gas ejection unit main body 190 so as to introduce the drying gas into the second space 192 described later.

The inner wall 200 is formed of a cylindrical body, and extends inside the gas ejection portion main body 190 along the axial direction of the casing 161. A double pipe structure is formed by the gas ejection portion main body 190 and the inner wall 200.

The gap between the inner wall 200 and the gas ejection portion main body 190 is uniform in the circumferential direction. Further, the inner wall 200 and the gas ejection part main body 190 have central axes concentrically.

That is, a triple pipe structure is formed by the casing 161, the gas ejection portion main body 190, and the inner wall 200. Further, the casing 161, the gas ejection part main body 190, and the inner wall 200 have central axes concentrically. Therefore, in the following, these central axial directions are simply referred to as axial directions.

The inner wall 200 divides the internal space of the gas ejection portion main body 190 into a first space 191 on the transport path side (rotary plate 171 side) of the object W to be dried and a second space 192 on a side different from the transport path side. There is. That is, the first space 191 is an annular space formed between the gas ejection portion main body 190 and the inner wall 200. The second space 192 is a space inside the inner wall 200.

The inner wall 200 is formed with a plurality of openings 201 for communicating the first space 191 and the second space 192. A plurality of openings 201 are formed in the axial direction. The opening 201 is formed according to the drying chambers 160 installed in a plurality of stages in the vertical direction. That is, one opening 201 is formed for one drying chamber 160.

The drying gas introduced into the second space 192 flows into the first space 191 through the opening 201.

The partition wall 210 is composed of an annular flat plate-shaped member. As shown in FIG. 6, the partition wall 210 axially partitions the first space 191 between the gas ejection portion main body 190 and the inner wall 200. For example, the partition wall 210 is horizontally connected to the side wall 190a of the gas ejection part main body 190 and the side surface 200a of the inner wall 200. The first space 191 partitioned by the partition wall 210 constitutes an individual space 193.

That is, the individual space 193 is an annular space surrounded by the inner wall 200, the partition wall 210, and the gas ejection portion main body 190.

An individual space 193 is formed for each of the openings 201 formed in the inner wall 200. In other words, one individual space 193 is configured for one opening 201. In order to uniformly expand the drying gas that has passed through the opening 201 into the individual space 193, the opening 201 is preferably formed, for example, in the axial center of the inner wall 200 surrounding the individual space 193.

The opening degree adjusting unit 230 adjusts the opening degree of the opening 201 of the inner wall 200, and adjusts the flow rate of the drying gas flowing into the individual space 193 from the second space 192. The opening degree adjusting unit 230 includes, for example, a slide member 231 and a support member 232 as shown in FIGS. 5 and 6.

The slide member 231 is composed of, for example, a plate-shaped member curved along the side surface 200a of the inner wall 200. The slide member 231 is configured to have a size larger than the opening 201. Therefore, the slide member 231 can also close the opening 201.

The support member 232 slidably supports the slide member 231. The support member 232 is provided, for example, along the side surface 200a on the first space 191 side of the inner wall 200. That is, the support member 232 is provided so as to be curved along the side surface 200a.

The support member 232 is composed of a rail-shaped member that supports the slide member 231 from above and below.

That is, the support member 232 is configured to include a set of curved rod-shaped curved members at the upper position and the lower position of the opening 201.

Specifically, the support member 232 is composed of, for example, a rod-shaped curved member having an L-shaped cross section perpendicular to the circumferential direction of the side surface 200a of the inner wall 200. The support member 232 is fixed to, for example, the upper position and the lower position of the opening 201 on the side surface 200a of the inner wall 200 along the circumferential direction of the side surface 200a. At this time, for example, the end surface 232b of the L-shaped short side portion 232a is connected to the side surface 200a.

In the cross section shown in FIG. 6, the upper end portion and the lower end portion of the slide member 231 are slidably engaged with the U-shaped engaging groove 233 formed by the L-shaped support member 232 and the inner wall 200. ing. As a result, the opening degree of the opening 201 can be adjusted by sliding the slide member 231.

Here, the opening degree of each opening 201 is adjusted so that the flow rate of the drying gas flowing into each individual space 193 becomes uniform. The method of adjusting the opening degree of the opening 201 is the same as the method of adjusting the opening degree of the opening 121 in the first embodiment.

Although not shown, the side wall 162 of the casing 161 and the gas ejection portion main body 190 are provided with an inspection port for adjusting the opening degree adjusting portion 230 and an openable / closable lid portion for closing the inspection port. There is.

The drying gas ejection nozzle 220 is provided so as to project from the side wall 190a of the gas ejection portion main body 190 toward the transport path side. The drying gas ejection nozzle 220 communicates with the individual space 193 and ejects the drying gas in the individual space 193 into the drying space 63 (transport path side).

The drying gas ejection nozzle 220 is arranged on the side wall 190a of the gas ejection portion main body 190 facing the inner wall 200 in which the opening 201 is formed. Further, the drying gas ejection nozzle 220 is arranged at a predetermined interval in the circumferential direction of the side wall 190a of the gas ejection portion main body 190.

Here, as shown in FIG. 5, the drying gas ejection nozzle 220 is arranged within a predetermined circumferential direction range of the gas ejection portion main body 190. The drying gas ejection nozzle 220 is arranged, for example, from the downstream side in the transport rotation direction (solid line arrow in FIG. 5) with respect to the position facing the carry-in / carry-out inlet 163.

For example, as shown in FIG. 5, a virtual straight line L connecting the upstream end of the drying gas ejection nozzle 220 arranged on the most upstream side in the transport rotation direction and the center O of the transport rotation axis, and a virtual straight line L in the transport rotation direction. The angle θ formed by the virtual straight line M connecting the downstream end of the drying gas ejection nozzle 220 arranged on the most downstream side and the center O of the transport rotation axis is 135 to 270 degrees. For example, the drying gas ejection nozzle 220 is arranged within the range of this angle θ.

By arranging the drying gas ejection nozzle 220 in this range, even if the slide door 164 is opened, the drying gas ejected from the drying gas ejection nozzle 220 can be directly discharged to the outside from the carry-out port 163. Absent.

Here, the opening 201 of the inner wall 200 described above is formed at a position facing the inner peripheral surface of the gas ejection portion main body 190 in a range excluding a predetermined circumferential range in which the drying gas ejection nozzle 220 is arranged.

In the cross section of the drying chamber 160 shown in FIG. 5, the opening 201 of the inner wall 200 is formed in the inner wall 200 within the range of the angle α on the side different from the angle θ at the angle formed by the virtual straight line L and the virtual straight line M, for example. Will be done. That is, the range of the angle α includes the upstream end of the drying gas ejection nozzle 220 arranged on the most upstream side in the transport rotation direction and the drying gas ejection nozzle 220 arranged on the most downstream side in the transport rotation direction. This is the circumferential range on the side where the drying gas ejection nozzle 220 is not arranged, and between the end portion on the downstream side of the above.

In the opening 201 of the inner wall 200, the end portion on the upstream side in the transport rotation direction and the end portion on the downstream side in the transport rotation direction are located within the above-mentioned range of the angle α.

For example, the opening 201 of the inner wall 200 is located in the transport rotation direction from the central axis of the drying gas ejection nozzle 220 located at the center of the drying gas ejection nozzles 220 arranged in the circumferential direction to the center O of the transport rotation axis. It is preferably formed at a position facing the inner peripheral surface of the gas ejection portion main body 190 displaced by 180 degrees. In this case, for example, the opening 201 is formed so that the center of the circumferential length of the opening 201 faces the inner peripheral surface displaced by 180 degrees.

As a result, the drying gas that has flowed into the individual space 193 from the second space 192 through the opening 201 does not directly flow into the drying gas ejection nozzle 220.

That is, the drying gas that has flowed into the individual space 193 through the opening 201 collides with the inner peripheral surface of the gas ejection portion main body 190 and spreads in the circumferential direction. At this time, the drying gas that collides with the inner peripheral surface of the gas ejection portion main body 190 spreads in the opposite directions of the transport rotation direction and the transport rotation direction, as shown by the broken line arrow in FIG.

As a result, a flow of the drying gas that spreads throughout the individual space 193 is formed, and the drying gas spreads uniformly in the individual space 193.

Further, as shown in FIG. 6, the drying gas ejection nozzles 220 are arranged in two upper and lower stages in the axial direction, for example. As described above, the drying gas ejection nozzles 220 of each stage are arranged at predetermined intervals in the circumferential direction of the side wall 190a of the gas ejection portion main body 190.

The number of steps in the axial direction provided with the drying gas ejection nozzle 220 is not particularly limited, and may be one step or three or more steps.

Here, in order to improve the heat transfer between the drying gas ejected from the drying gas ejection nozzle 220 and the object W to be dried, for example, the object W to be dried is conveyed to the drying gas ejection nozzle 220. It is preferably arranged so as to be perpendicular to the direction. That is, it is preferable that the drying gas ejection nozzle 220 is arranged so as to vertically collide with the object to be dried W to which the ejected drying gas is conveyed.

Therefore, for example, in the cross section of the drying chamber 160 shown in FIG. 5, the drying gas ejection nozzle 220 is arranged so that its central axis is located on a line extending radially from the center O of the transport rotation axis.

The structure of the drying gas ejection nozzle 220 is the same as the structure of the drying gas ejection nozzle 140 in the first embodiment.

Next, the operation of the drying device 11 will be described.

At the start of operation of the drying device 11, the intake fan 32a and the circulation fan 81 are driven.

When the combustion in the burner 30 starts, the drying gas (combustion gas) in the burner 30 is sucked into the introduction pipe 80 by the suction of the circulation fan 81. The drying gas sucked into the introduction pipe 80 is introduced into the gas ejection portion 180 of the drying chamber 160.

Specifically, the drying gas sucked into the introduction pipe 80 is introduced into the second space 192 in the gas ejection portion main body 190 in the gas ejection portion 180. At this time, a predetermined amount of the drying gas flowing through the introduction pipe 80 is discharged to the atmosphere through the branch pipe 100.

The drying gas introduced into the second space 192 spreads in the second space 192. Then, the drying gas spread in the second space 192 flows into each individual space 193 through the opening 201 of the inner wall 200. At this time, the flow rate of the drying gas flowing into each individual space 193 is adjusted to be uniform by the opening degree adjusting unit 230.

As shown by the broken line arrow in FIG. 5, the drying gas flowing into the individual space 193 collides with the inner peripheral surface of the gas ejection part main body 190 and spreads uniformly in the transport rotation direction and the opposite direction of the transport rotation direction. .. Then, the drying gas spread in the individual space 193 is ejected from the drying gas ejection nozzle 220 into the drying space 63.

At this time, the pressure of the drying gas in the individual space 193 becomes substantially uniform. Further, since the drying gas that has passed through the opening 201 collides with the inner peripheral surface of the gas ejection portion main body 190 and spreads in the circumferential direction, each drying gas ejection nozzle 220 has a dynamic pressure component of the flow of the drying gas. Also works uniformly.

As a result, the pressure difference between the pressure of the communication portion with each drying gas ejection nozzle 220 in the individual space 193 and the pressure in the drying space 63 becomes approximately the same. Therefore, the flow rates of the drying gas flowing from the individual space 193 into each drying gas ejection nozzle 220 are substantially equal. As a result, the flow velocities of the drying gas ejected from each drying gas ejection nozzle 220 provided for one individual space 193 become substantially equal.

Further, the flow rate of the drying gas flowing into each individual space 193 is set to be uniform. Therefore, even the flow rates (flow velocities) of the drying gas ejected from the drying gas ejection nozzles 220 provided for the different individual spaces 193 are substantially the same.

The drying gas ejected into the drying space 63 collides with the object to be dried W which is arranged on the rotating plate 171 and is rotationally conveyed. Since the flow velocity of the drying gas ejected from each drying gas ejection nozzle 220 is substantially uniform, the object to be dried W can be heated uniformly.

Here, the drying gas ejected from each drying gas ejection nozzle 220 spreads in the annular drying space 63. Therefore, the temperature of the drying space 63 can be maintained substantially constant while the object W to be dried goes around the drying space 63.

The action of the drying gas in the drying space 63 being guided to the combustion chamber 20 through the return pipe 85 is as described in the first embodiment.

As described above, in the drying device 11 of the second embodiment, the internal space of the gas ejection part main body 190 is the first space 191 on the transport path side of the object W to be dried and the second space on a side different from the transport path side. An inner wall 200 that partitions the space 192 is provided along the transport direction of the object to be dried W. The inner wall 200 is formed with a plurality of openings 201 that allow the first space 191 and the second space 192 to communicate with each other. Further, the first space 191 is divided into a plurality of individual spaces 193 by a partition wall 210 for each opening.

By providing the opening degree adjusting unit 230 in the gas ejection unit main body 190 having such a configuration, it is possible to introduce a drying gas having a uniform flow rate into each individual space 193 from the second space 192.

Further, the opening 201 of the inner wall 200 is formed at a position facing the inner peripheral surface of the gas ejection portion main body 190 in a range excluding a predetermined circumferential range in which the drying gas ejection nozzle 220 is arranged. Then, the drying gas that has passed through the opening 201 collides with the inner peripheral surface of the gas ejection portion main body 190 and spreads in the circumferential direction, so that the flow of the drying gas spreads throughout the individual space 193.

As a result, the pressure distribution of the drying gas in the individual space 193 can be reduced, and a substantially uniform pressure distribution can be obtained. Further, the dynamic pressure of the flow of the drying gas also acts uniformly on each of the drying gas ejection nozzles 220.

Therefore, the flow rates of the drying gas flowing from the individual spaces 193 into the drying gas ejection nozzles 220 are substantially equal, and the flow velocities of the drying gas ejected from the drying gas ejection nozzles 220 are substantially equal.

As a result, the object to be dried W moved by the transport device 170 can be uniformly heated.

(Third Embodiment)
Here, other forms of the drying gas ejection nozzle will be described. In the above-described embodiment, the tubular drying gas ejection nozzles 140 and 220 have been illustrated and described, but the shape of the drying gas ejection nozzle is not limited to this shape.

Here, a configuration in which the gas ejection portion 70 of the first embodiment is provided with a drying gas ejection nozzle having another shape will be described. The gas ejection unit 180 of the second embodiment can also use a drying gas ejection nozzle having another shape.

FIG. 7 is a perspective view of the gas ejection portion 250 of the drying device 12 of the third embodiment. FIG. 8 is an enlarged plan view of a part of the drying gas ejection nozzle 260 when the drying gas ejection nozzle 260 is viewed from the drying space 63 side. The same components as those of the gas ejection part 70 of the drying device 10 of the first embodiment are designated by the same reference numerals, and duplicate description will be omitted or simplified.

As shown in FIG. 7, the gas ejection portion 250 is provided with a slit-shaped drying gas ejection nozzle 260. The drying gas ejection nozzle 260 is arranged on the side wall 111 of the gas ejection portion main body 110 facing the inner wall 120 in which the opening 121 is formed. The drying gas ejection nozzle 260 is provided so as to project from the side wall 111 of the gas ejection portion main body 110 toward the transport path side.

Further, the drying gas ejection nozzle 260 is provided along the longitudinal direction of the gas ejection portion main body 110 (the transport direction of the object to be dried W). The drying gas ejection nozzle 260 communicates with the individual space 114 and ejects the drying gas in the individual space 114 into the drying space 63 (transport path side).

Here, an example is shown in which a drying gas ejection nozzle 260 having two stages in the vertical direction is provided for one individual space 114. The drying gas ejection nozzle 260 may be provided in one stage or in three or more stages.

The drying gas ejection nozzle 260 is configured by combining two rod-shaped members 261 having an L-shaped cross section perpendicular to the longitudinal direction of the gas ejection portion main body 110. That is, the drying gas ejection nozzle 260 is composed of a pair of L-shaped rod-shaped members 261.

The L-shaped rod-shaped member 261 has a long side portion 262 and a short side portion 263. As shown in FIG. 8, the long side portion 262 is formed with an elongated hole 262a for attaching the L-shaped rod-shaped member 261 to the side wall 111 of the gas ejection portion main body 110 with bolts 264 or the like.

The elongated hole 262a is composed of a hole extending in the vertical direction (vertical direction) so that the position of the L-shaped rod-shaped member 261 can be adjusted in the vertical direction. A screw hole for screwing with the bolt 264 is formed on the side wall 111 of the gas ejection portion main body 110.

In the cross section perpendicular to the longitudinal direction of the gas ejection portion main body 110, the short side portion 263 intersects, for example, the long side portion 262 at a right angle. As a result, the drying gas ejected from the drying gas ejection nozzle 260 collides perpendicularly with the conveyed object W to be dried.

Here, a slit-shaped opening (not shown) is formed in the side wall 111 of the gas ejection portion main body 110 in the longitudinal direction of the gas ejection portion main body 110 in accordance with the arrangement position of the drying gas ejection nozzle 260. The pair of L-shaped rod-shaped members 261 are fixed to the upper position and the lower position of the opening in the longitudinal direction of the gas ejection portion main body 110.

Then, the short side portions 263 of the pair of L-shaped rod-shaped members 261 face each other to form a protruding portion protruding toward the transport path side. The drying gas is ejected into the drying space 63 through the slit 265 formed between the short side portions 263.

Here, the width of the slit 265 (distance between the short side portions 263) can be appropriately adjusted by adjusting the mounting position of one or both L-shaped rod-shaped members 261 in the vertical direction. Thereby, for example, the flow velocity of the drying gas ejected from the drying gas ejection nozzle 260 can be adjusted.

A stop plate 266 is sandwiched between both ends of the L-shaped rod-shaped member 261 in the longitudinal direction of the gas ejection portion main body 110 between the short side portions 263 in order to prevent the drying gas from being ejected in the longitudinal direction. ..

As described above, according to the drying apparatus 12 of the third embodiment, the drying gas ejection nozzle 260 in the gas ejection portion 250 is composed of the L-shaped rod-shaped member 261 to eject the slit-shaped drying gas. It can form a part.

As a result, the width of the slit 265 formed between the short side portions 263 can be appropriately adjusted, so that the flow velocity of the drying gas ejected from the drying gas ejection nozzle 260 can be easily adjusted.

In the drying apparatus 12 of the third embodiment, the flow rates of the drying gas flowing from the individual space 114 into the drying gas ejection nozzles 260 are substantially the same as in the first embodiment, and the drying is performed. The flow velocities of the drying gas ejected from the gas ejection nozzle 260 are substantially equal.

Here, as described above, the slit-shaped configuration of the gas ejection nozzle for drying can be applied to the gas ejection portion 180 of the second embodiment. When the gas ejection portion 180 of the second embodiment is provided with a slit-shaped drying gas ejection nozzle configuration, the drying gas ejection nozzle is composed of a pair of L-shaped rod-shaped curved members. The L-shaped rod-shaped curved member is provided on the outer periphery of the side wall 190a of the gas ejection portion main body 190 in the circumferential direction.

A slit-shaped opening is formed in the side wall 190a in the circumferential direction according to the arrangement position of the drying gas ejection nozzle. The pair of L-shaped rod-shaped curved members are fixed to the upper position and the lower position of the opening in the circumferential direction of the side wall 190a.

Similar to the L-shaped rod-shaped member 261, a long hole for attaching the L-shaped rod-shaped curved member to the side wall 190a with a bolt or the like is formed on the long side portion of the L-shaped rod-shaped curved member. This elongated hole is composed of a hole extending in the vertical direction (vertical direction) so that the position of the L-shaped rod-shaped curved member can be adjusted in the vertical direction.

The drying gas ejection nozzle is arranged within the range of the angle θ as in the second embodiment.

Even when the above-mentioned slit-shaped drying gas ejection nozzle configuration is applied to the gas ejection portion 180 of the second embodiment, the width of the slit formed between the short sides of the L-shaped rod-shaped curved member is increased. It can be adjusted as appropriate. Therefore, the flow velocity of the drying gas ejected from the drying gas ejection nozzle can be easily adjusted.

Further, as in the second embodiment, the flow rates of the drying gas flowing from the individual space 193 into each drying gas ejection nozzle are substantially equal, and the flow velocity of the drying gas ejected from each drying gas ejection nozzle becomes substantially equal. Almost equal.

In the above-described embodiment, the circulation type drying device has been described as an example, but the present invention is not limited to this. The configuration of this embodiment can also be applied to a non-circulating drying device.

In the above-described embodiment, an example is shown in which the combustion gas generated in the burner 30 is used as the drying gas, but the drying gas may be generated by other means. For example, air heated in an electric furnace or the like may be used as the drying gas.

Further, here, an example of a drying apparatus for heating and drying the object to be dried W is shown, but the present invention is not limited to this. Also in the drying apparatus for cooling and drying the object W to be dried, the configurations of the drying chambers 60 and 160, particularly the gas ejection portions 70 and 180 in the present embodiment can be applied. In the drying device that cools and dries the object W to be dried, for example, a cooling device that cools air is used instead of the burner 30.

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, 11, 12 ... Drying device, 20 ... Combustion chamber, 20a ... One end, 20b ... The other end, 21 ... Filter, 30 ... Burner, 31 ... Fuel supply system, 32 ... Air supply system, 32a ... Intake fan, 60, 160 ... Drying chamber, 61 ... Casing, 62, 170 ... Conveying device, 63 ... Drying space, 70, 180, 250 ... Gas ejection part, 80 ... Introduction piping, 80a ... Branch part, 81 ... Circulation fan, 82 ... Fan motor , 85 ... Return pipe, 86, 100 ... Branch pipe, 87, 101 ... Flow adjustment unit, 110, 190 ... Gas ejection unit main body, 111, 115, 162, 190a ... Side wall, 112, 191 ... First space, 113 , 192 ... Second space, 114, 193 ... Individual space, 120, 200 ... Inner wall, 120a, 120b ... Surface, 121, 201 ... Opening, 130, 210 ... Partition wall, 131 ... Vertical partition wall, 132 ... Horizontal Directional partition wall, 140, 220, 260 ... Drying gas ejection nozzle, 150, 230 ... Opening adjustment part, 151, 231 ... Slide member, 152, 232 ... Support member, 152a, 232a, 263 ... Short side part, 152b , 232b ... End face, 153, 233 ... Engagement groove, 161 ... Casing, 163 ... Carry-out / carry-out inlet, 164 ... Slide door, 171 ... Rotating plate, 200a ... Side surface, 261 ... L-shaped rod-shaped member, 262 ... Long side , 262a ... long hole, 264 ... bolt, 265 ... slit, 266 ... stop plate.

Claims (11)

A drying device that dries the object to be dried by ejecting a drying gas onto the object to be dried.
The main body of the gas ejection part provided along the transport direction of the object to be dried,
A second space is provided inside the main body of the gas ejection portion along the transport direction of the object to be dried, and the internal space of the main body of the gas ejection portion is different from the first space on the transport path side of the object to be dried and the second on the side different from the transport path side. An inner wall in which a plurality of openings are formed to communicate the first space and the second space while partitioning the space.
For each of the plurality of openings formed in the inner wall, a partition wall for partitioning the first space into a plurality of individual spaces, and a partition wall.
A drying gas ejection nozzle that communicates with the individual space, is provided so as to project from the side wall of the gas ejection portion main body toward the transport path side, is composed of a tubular tube, and forms a jet of drying gas that collides with an object to be dried. ,
With an opening adjustment unit that adjusts the opening of each opening of the inner wall
With
The main body of the gas ejection portion is a cylindrical casing having an outer peripheral surface along the transport direction of the object to be dried.
The inner wall is a cylindrical body provided inside the main body of the gas ejection portion.
A drying device, wherein the partition wall is a plate-shaped member that partitions the first space between the gas ejection portion main body and the inner wall in the axial direction of the gas ejection portion main body . A drying device that dries the object to be dried by ejecting a drying gas onto the object to be dried.
The main body of the gas ejection part provided along the transport direction of the object to be dried,
A second space is provided inside the main body of the gas ejection portion along the transport direction of the object to be dried, and the internal space of the main body of the gas ejection portion is different from the first space on the transport path side of the object to be dried and the second on the side different from the transport path side. An inner wall in which a plurality of openings are formed to communicate the first space and the second space while partitioning the space.
For each of the plurality of openings formed in the inner wall, a partition wall for partitioning the first space into a plurality of individual spaces, and a partition wall.
The cross-sectional shape perpendicular to the transport direction of the object to be dried is L, which is provided so as to communicate with the individual space and project from the side wall of the main body of the gas ejection portion toward the transport path side to form a slit in the transport direction of the object to be dried. A drying gas ejection nozzle composed of a pair of character-shaped members and capable of adjusting the width of the slit,
With an opening adjustment unit that adjusts the opening of each opening of the inner wall
A drying device comprising. The main body of the gas ejection part is a box-shaped casing extending along the transport direction of the object to be dried.
The drying apparatus according to claim 2 , wherein the individual space is a cubic or rectangular parallelepiped space surrounded by the inner wall, the partition wall, and the gas ejection portion main body. The drying apparatus according to claim 3, wherein the side wall of the main body of the gas ejection portion provided with the gas ejection nozzle for drying faces the inner wall in which the opening is formed. The drying apparatus according to claim 3 or 4, wherein the main body of the gas ejection portion is arranged so as to face each other so as to sandwich a transport path for the object to be dried. The main body of the gas ejection portion is a cylindrical casing having an outer peripheral surface along the transport direction of the object to be dried.
The inner wall is a cylindrical body provided inside the main body of the gas ejection portion.
The drying according to claim 2, wherein the partition wall is a plate-shaped member that partitions the first space between the gas ejection portion main body and the inner wall in the axial direction of the gas ejection portion main body. apparatus. The drying apparatus according to claim 1 or 6, wherein the drying gas ejection nozzle is arranged within a predetermined circumferential range of the cylindrical casing. The opening of the inner wall is formed at a position facing the inner peripheral surface of the cylindrical casing in a range excluding the predetermined circumferential range in which the drying gas ejection nozzle is arranged. The drying apparatus according to claim 7. The opening adjustment unit
A slide member that adjusts the opening degree of the opening, and
With a support member that slidably supports the slide member along the surface of the inner wall
Drying device according to any one of claims 1 to 8, characterized in that it comprises. The drying apparatus according to any one of claims 1 to 9, wherein a plurality of the drying gas ejection nozzles are provided in each of the individual spaces. The drying apparatus according to any one of claims 1 to 10, wherein a drying gas is introduced into the second space in the main body of the gas ejection portion.

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