JP2016191488A - Flow duct of dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow duct which is installed in a narrow space and stably supplies large volume of clean air to a dryer.SOLUTION: A flow duct 15 of a dryer 10 includes a filter case 40 which incorporates a filter 80 and is installed in a passage between a blower 30 and the dryer 10. The filter case 40 includes: an expanding part 51 which is formed so that a passage area gradually expands from an air intake port 60; a filter part 52 to which the filter 80 is assembled; and a rectification member 90 assembled to the expanding part 51. The rectification member 90 divides a space between the air intake port 60 and the filter 80 so that airflow is directed to a periphery part of the filter 80.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a structure of a blower duct of a dryer attached to a printing machine, a coating apparatus, or the like that performs drying by blowing wind.

  In such a drier, it is necessary to stably supply clean air from which dust and the like are removed with a large air volume in order to prevent adhesion of foreign matters and improve drying performance.

  For this reason, such a dryer is equipped with a blower duct with a powerful blower and a high-performance filter, as well as a heating device for heating the air, and a large amount of air generated by the blower is used as a filter. By connecting, clean and large air volume can be stably supplied.

  The filter has a large pressure loss when the filtration area is small. Therefore, in such a ventilation duct, in order to increase the filtration area of the filter, a filtration case that increases the flow path area is provided in the middle of the ventilation duct, and the flow path is partitioned inside the filtration case. In many cases, a filter is installed.

  However, if the flow path area is suddenly expanded as in this filtration case, the air flow distribution becomes non-uniform and turbulence and drift occur. In order to suppress non-uniformity of the air volume distribution, turbulence, and the like, a plate-like air direction control member is installed in the duct.

  For example, Patent Literature 1 discloses a duct of an air conditioner, and a plurality of airflow distribution plates having a streamline shape are arranged at predetermined intervals at branch points of the duct.

  Patent Document 2 discloses a ventilator in which the air duct is arranged to be biased to one side of the side surface, and diffuses and guides outside air to a filter installed in the ventilator. A plurality of diffusion plates are arranged in front of the air outlet.

Japanese Utility Model Publication 3-31252 JP 2004-69125 A

  Compared to air conditioners and ventilators, dryers require extremely large air volumes.

  In addition to the fact that the space for installing the air duct is limited to a narrow area around the dryer, the length of the air duct after the blower is preferably shorter from the viewpoint of suppressing pressure loss. Is often placed near the blower.

  If there is a blower near the filtration case, strong air formed by the blower flows into the filtration case in a turbulent state, and therefore, a problem that cannot be recognized by the air conditioner may occur in the blower duct of the dryer.

  One of the problems is deformation or breakage of the filter due to wind power. Since a strong wind hits the filter, the filter can be deformed or broken even with non-uniform air flow distribution or turbulent flow, which is not a problem with an air conditioner.

  In FIG. 1, an example of the ventilation duct of the conventional dryer is shown. In the air duct 100, the filtration case 101 has an enlarged portion 101a in which the flow area gradually increases from the upstream pipe 102 and a reduced portion 101b in which the flow area gradually decreases toward the downstream pipe 103. The filter 105 is installed inside the filtration case 101 so as to partition the enlarged portion 101a and the reduced portion 101b forward and backward.

  In the case of the air duct 100, most of the air flowing into the enlarged portion 101a from the upstream pipe 102 flows toward the central portion of the filter 105, so that the wind hitting the central portion of the filter 105 becomes strong. And, as the air volume increases, the non-uniformity in the air volume distribution between the central part and the peripheral part increases. Therefore, in this air duct 100 with a large air volume, clogging, deformation, and breakage are extremely likely to occur at the center of the filter 105, and the filter 105 may be frequently replaced.

  On the other hand, as in Patent Document 1 and Patent Document 2, if a plurality of wind direction control members are installed around the outlet of the upstream duct, it helps to eliminate unevenness in the air volume distribution. However, since the air volume is large, these wind direction control members Turbulence and drift are promoted. As a result, wind noise and the side impact of the wind on the filter are increased, and it is easy to generate a large noise and vibration, and the deformation and breakage of the filter may be increased.

  In addition, since it is necessary to assemble the wind direction control member so as to be able to withstand strong wind pressure, the structure is complicated and the member cost is likely to increase.

  Therefore, an object of the present invention is to provide a blower duct that can be installed in a narrow space and can stably supply clean air with a large air volume to a dryer.

  The present invention relates to a blower duct that sends wind for drying to a dryer.

  The blower duct includes a blower that generates an air flow, and a filter case that includes a filter and is installed in a flow path between the blower and the dryer. The filtration case includes an air intake opening that opens to the blower side, an enlarged portion formed so that a flow passage area gradually expands from the air intake, and the flow passage, and the flow passage is partitioned off. It has a filtration part to which the filter is assembled, and a rectifying member having a certain thickness and having a large number of ventilation openings in the thickness direction and assembled to the enlarged part. And the space between the said air intake and the said filter is partitioned off by the said rectification member so that the flow of air may face the peripheral part of the said filter.

  The peripheral part of the filter is higher in strength than the central part and has a larger filtration area than the central part. Therefore, by directing the air flow toward the peripheral portion of the filter by the rectifying member, it is possible to appropriately filter even with strong wind while suppressing deformation and breakage of the filter. In addition, since the air flow is not directed to the center of the filter, the durability of the filter is improved.

  Since the blower and the filter are separated from each other by the rectifying member, all the air directed to the filter passes through the ventilation opening. Therefore, since the turbulent air flow is directed to the periphery of the filter while being rectified by the rectifying member, even a strong air flow can be smoothly introduced into the filter, and the load on the filter can be reduced. Can do.

  Specifically, it is preferable that the rectifying member has a substantially square cross-sectional shape and is assembled so that the outer peripheral portion thereof is substantially orthogonal to the inner surface of the enlarged portion.

  Then, the air that has passed through the rectifying member is directed to the periphery of the filter along the inclined inner surface of the enlarged portion, so that a strong air flow can be smoothly introduced into the filter and the load on the filter is reduced. can do.

  Further, since the cross-sectional shape of the rectifying member becomes a square shape constricted toward the filter and the center side of the rectifying member is separated from the air intake port, nonuniform distribution of wind permeation to the rectifying member can be reduced.

  More specifically, the enlarged portion includes a pair of inclined surfaces that are inclined so that the distance gradually increases from the air intake port, and a pair of parallel opposing surfaces that are connected to both ends of the pair of inclined surfaces. And the said rectification | straightening member can be comprised by assembling | attaching the two members of the rectangular plate shape so that it may be substantially orthogonal to each of the said inclined surface.

  Then, since the structure becomes simple and can be easily manufactured, it can be realized at low cost.

  In particular, when the thickness of the rectifying member is t, the maximum inner diameter of the ventilation opening is Φ, and the inclination angle of the enlarged portion with respect to the center line of the air intake is θ, the formula: t> Φ / tan θ is established. It is preferable to configure so as to.

  By doing so, when the air passes through the ventilation opening, the air can always be brought into contact with the rectifying member. Therefore, the air flow can be stably directed to the peripheral portion of the filter, and the air can be rectified stably.

  The rectifying member may be formed using a honeycomb structure.

  If it does so, the rectification | straightening member provided with the outstanding aperture ratio which can suppress a pressure loss, and the intensity | strength which can endure a strong wind pressure is realizable at low cost.

  Furthermore, the rectifying member may be disposed in the vicinity of the air intake port.

  If it does so, a rectifying member will become small and the intensity | strength of a rectifying member can be improved. Further, since the distance from the rectifying member to the peripheral portion of the filter is increased, the rectifying effect is improved.

  According to the air duct of the present invention, it can be installed in a narrow space, and clean air can be stably supplied to the dryer with a large air volume.

It is the schematic which shows an example of the ventilation duct of the conventional dryer. It is the schematic which shows the coating apparatus of embodiment. It is the schematic which shows the principal part seen from the arrow X direction in FIG. It is the schematic which shows the principal part seen from the arrow Y direction in FIG. It is a schematic perspective view which shows the structure of a filtration case. (A) is a schematic longitudinal cross-sectional view which shows the inside of a filtration case, (b) is a schematic top view of a filtration case. (A) is a schematic sectional drawing which shows the principal part of a filtration case, (b) And (c) is the schematic explaining the structure of a rectification | straightening member.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the following description is merely illustrative in nature and does not limit the present invention, its application, or its use.

  In FIG. 2, an example of the coating apparatus to which the ventilation duct of this invention is applied is shown. In addition, the ventilation duct here is not a mere pipeline, but is a concept including a plurality of functional members constituting the pipeline.

  The coating device 1 is a dry laminating coating device (dry laminator) that uses two organic solvent-based adhesives while continuously transporting the two webs W1, W2. The coating device 1 is composed of the first unwinding device 2, the second unwinding device 3, the winding device 4, the coating device 5, the laminating device 6, the dryer 10, and the like.

  The first unwinding device 2 is a device for unwinding the first web W1, and the second unwinding device 3 is a device for unwinding the second web W2. An adhesive is applied by the coating device 5 to the sticking surface of the first web W <b> 1 unwound from the first unwinding device 2. The first web W1 to which the adhesive is applied is sent to the dryer 10.

  By passing through the dryer 10, the first web W1 is dried and the solvent of the applied adhesive is removed. The first web W1 that has passed through the dryer 10 and the second web W2 that is unwound from the second unwinding device 3 are pasted together by the laminating device 6.

  The integrated web W is wound up by the winding device 4 in a roll shape. These apparatuses 2, 3, 4, 5, and 6 are controlled so as to operate synchronously, and the coating apparatus 1 is configured so that it can be continuously processed at a high speed.

  The dryer 10 is provided with a plurality of horizontally long drying chambers 11, which are connected in series with each other. The dryer 10 is installed on a horizontally long support base 12 that is located away from the floor, and a first unwinding device 2 and a second unwinding device are installed in a space below the support base 12. 3, a winding device 4, a coating device 5, and a laminating device 6 are disposed.

  At both ends of each drying chamber 11, an inlet and an outlet are opened, and the first web W <b> 1 passes through each drying chamber 11 through the inlet and the outlet. Each drying chamber 11 is also provided with an exhaust device (not shown) that removes the solvent and exhausts it.

  Inside each drying chamber 11, a plurality of guide rollers are installed side by side. The first web W1 is conveyed in a state where it is placed on these guide rollers with the sticking surface facing upward.

  In each drying chamber 11, a plurality of hot air blowing devices 13 for blowing hot air are installed to dry the first web W <b> 1. In order to send warm air to these warm air blowing devices 13, as shown in FIGS. 3 and 4, a blower duct 15 is attached to each drying chamber 11.

(Blower duct)
Each air duct 15 is installed on a support frame 16 provided on the side of the support base 12 so as to protrude to the side of the dryer 10. The air duct 15 includes a heating device 20, a blower 30, a filtration case 40, and the like.

  The heating device 20 is a device mainly composed of a heat exchanger 21. An air supply pipe 22 that takes in fresh air is connected to the heating device 20.

  The heat exchanger 21 is provided with a heat supply system (not shown) that circulates and supplies a medium such as steam or hot water through a boiler or the like not shown. The air flowing into the heating device 20 is heated by exchanging heat with the medium flowing through the heat exchanger 21 and then flows out of the heating device 20.

  The heating device 20 is also provided with a temperature control system (not shown). With this temperature control system, the temperature of the air heated by the heating device 20 is warm air blown from the hot air blowing device 13. Automatically adjusted based on the temperature of the. Thereby, the temperature of the warm air is maintained in a predetermined temperature range set in advance in the range of 50 ° C to 100 ° C.

  The blower 30 is disposed close to the downstream side of the heating device 20. In the blower duct 15, the suction port of the blower 30 is directly connected to the outlet of the heating device 20 without using a long pipe. In the air duct 15, a blower of a type in which the directions of the suction port and the discharge port are substantially orthogonal is used in order to save space.

The blower 30 uses a high output model in order to generate a strong wind flow. The air volume is at least 50 m ³ / min or more, and is usually set as appropriate according to the specification in the range of 50 to 100 m ³ / min.

  The filter case 40 is installed in an air flow path between the blower 30 and the dryer 10. Specifically, the filtration case 40 is disposed close to both the blower 30 and the dryer 10 in order to suppress pressure loss and save space, and the flow path of the air follows the blowing direction of the blower 30. Are arranged as follows.

(Filtration case)
5 and 6 show details of the filtration case 40. FIG. The filtration case 40 is a box-shaped device, and the filtration case 40 includes a case main body 50, an air intake port 60, an air intake port 70, and the like. The case body 50 includes an enlarged portion 51, a filter portion 52, a reduced portion 53, and the like, and a filter 80 and a rectifying member 90 are assembled therein.

  The air intake port 60 is an opening for taking air into the filtration case 40, and has a shape corresponding to the shape of the discharge port of the blower 30. The air intake 60 is directly connected to the discharge port of the blower 30 without using a long pipe.

  The enlarged portion 51 is a portion formed so that the flow path area gradually increases from the air intake port 60 side. The enlarged portion 51 includes a pair of opposing wall portions 51a and 51a, a pair of inclined wall portions 51b and 51b, and an end wall portion 51c. The pair of opposing wall portions 51a and 51a are each formed in a trapezoidal shape, and face each other in a state of being parallel to each other at the left and right.

  Each of the pair of inclined wall portions 51b and 51b is formed in a rectangular shape, and is connected to each of the inclined sides of the opposing wall portions 51a and 51a so as to be spanned therebetween. The opening on the upper bottom side of the facing wall 51a of the enlarged portion 51 is closed by the end wall 51c, and an air intake port 60 is provided at an intermediate portion between the facing walls 51a and 51a. .

  The filtering part 52 is a rectangular frame-shaped part that is continuous with the opening on the lower bottom side of the opposing wall part 51a of the enlarged part 51. A filter 80 is detachably assembled in the filtering unit 52. A filter outlet 52a covered with a removable cover is provided on the side surface of the filter portion 52 in order to insert and remove the filter 80.

  The filter 80 is a general air filter and is selected according to specifications. The filter 80 includes a frame 81 having a rectangular cross section and a plurality of separators 82 arranged in a horizontal row with a gap in the frame 81. Each separator 82 is made of an aluminum plate or the like, and both ends thereof are fixed to the frame 81. A filter medium that traps dust is sandwiched between the separators 82.

  The filter 80 is disposed in the filtration unit 52 so that the fixing portions of the separators 82 are positioned vertically. The frame 81 is assembled to the inner surface of the filtration unit 52 without any gap, and the air flow path is partitioned by the filter 80.

  The reduction part 53 is a part formed so as to be gradually reduced in area of the flow path continuously to the filtration part 52. An air outlet 70 connected to the dryer 10 is provided at the end of the reduction unit 53.

(Rectifying member)
In the filtration case 40, the rectifying member 90 is configured using two members (rectifying plates 91) having a rectangular plate shape.

  Each rectifying plate 91 has a constant thickness, and includes a honeycomb structure 91a and a horizontally long frame 91b surrounding the periphery. The honeycomb structure 91a has a structure that is partitioned in a hexagonal column shape without a gap, and each rectifying plate 91 has a large number of hexagonal openings (ventilation openings 91c) penetrating in the thickness direction. Has been.

  Each rectifying plate 91 is assembled to the enlarged portion 51 so as to partition the space between the air intake port 60 and the filter 80, and has a substantially square cross-sectional shape when viewed from the side. It is arranged in the vicinity of the air intake 60.

  Specifically, as illustrated in FIG. 7A, each rectifying plate 91 is disposed at a boundary portion between the opposing wall portion 51 a and the inclined wall portion 51 b and the end wall portion 51 c. The frame 91b is fastened by screws 95 (fasteners) from the outside of 51a and the inclined wall portion 51b.

  The enlarged portion 51 includes a pair of inclined surfaces 92 and 92 which are inclined so that the interval gradually increases vertically from the air inlet 60 side, and a pair of parallel surfaces connected to both ends of the pair of inclined surfaces 92 and 92. Opposite surfaces 93, 93. The three sides of the frame 91b of each rectifying plate 91 are assembled so as to be substantially orthogonal to the inner surfaces 93, 92, 93 so that no gap is generated.

  Each rectifying plate 91 is assembled so as to be substantially orthogonal to each inclined surface 92, so that the protruding end side is inclined toward the filter 80. When the sides on the protruding end side of each rectifying plate 91 are in contact with each other, the rectifying member 90 has a substantially square cross-sectional shape constricted toward the filter 80.

  The thickness of each rectifying plate 91 and the maximum inner diameter of the ventilation opening 91 c are set based on the inclination angle of the inclined surface 92.

  Specifically, as shown in FIG. 7, the thickness of the rectifying plate 91 is t, the maximum inner diameter of the ventilation opening 91c is Φ, and the inclination angle of the inclined surface 92 (the angle with respect to the center line of the air intake port 60) is θ. If so, the formula: t> Φ / tan θ is established.

  As shown by arrows in FIGS. 6A and 6B, the rectifying member 90 disperses the strong air flow flowing in from the blower 30 up and down, and the air flow is divided into the upper and lower peripheral portions of the filter 80. To go to.

  Since the upper and lower peripheral portions of the filter 80 are close to the frame 81, the strength is higher than that of the central portion. Since the filters 80 are arranged so that the fixing portions of the separators 82 are positioned above and below, the upper and lower peripheral portions of the filters 80 have higher strength.

  In addition, since the filtration area becomes larger by dispersing in the peripheral portion than in the case where it is concentrated in the central portion, the air flow is directed to the peripheral portion of the filter 80 by the rectifying member 90, so that the filter 80 can be used even in strong winds. Filtration can be appropriately performed while suppressing deformation and breakage.

  Since the air flow is not directed to the central portion of the filter 80 having relatively low strength, the durability of the filter 80 can be improved.

  In this case, of the filtration area of the filter 80, the peripheral part of the filter 80 is used in a biased manner. However, when the usage period is long, the peripheral part is clogged earlier than the central part of the filter 80. As a result, the filtration resistance increases. As a result, since filtration is gradually performed at the center of the filter 80, the entire filtration area of the filter 80 can be used efficiently.

  The rectifying member 90 also rectifies the turbulent air flow and directs it to the periphery of the filter 80 along the inclined surface 92.

  Since the air flow path between the blower 30 and the filter 80 is partitioned by the rectifying member 90 in which the ventilation opening 91c is formed over the entire surface, all of the air directed to the filter 80 passes through the ventilation opening 91c. . Each ventilation opening 91c is inclined at the same angle as the inclined surface 92, and by satisfying the above-described formula, the ventilation opening 91c is always set to contact the rectifying member 90 when passing through the ventilation opening 91c. Yes.

  Therefore, the turbulent air flow is rectified by passing through the rectifying member 90 and is directed along the inclined surface 92 toward the periphery of the filter 80, so that a strong air flow can be smoothly introduced into the filter 80. The load on the filter 80 can be reduced.

  By using the honeycomb structure 91a for the rectifying member 90, a rectifying member having an excellent aperture ratio capable of suppressing pressure loss and strength capable of withstanding strong wind pressure can be realized at low cost.

  By making the cross-sectional shape of the rectifying member 90 into a square shape constricted toward the filter 80, the distance from the air inlet 60 to the rectifying member 90 is larger on the center side than on the peripheral side of the flow path. ing. Although the air is stronger on the center side than the periphery, the center side of the rectifying member 90 is away from the downstream side.

  Since the flow passage cross section is rectangular and the flow straightening member 90 is configured by combining the two flow straightening plates 91, it can be easily manufactured and can be realized at low cost. The rectifying plate 91 can be screwed from the outside of the filtration case 40, and the rectifying plate 91 can be firmly fixed to the filtration case 40 only by screwing.

  By arranging the rectifying member 90 in the vicinity of the air intake port 60, the rectifying member 90 becomes small, and the assembly strength of the rectifying member 90 can be improved. Moreover, since the distance from the rectifying member 90 to the peripheral portion of the filter 80 is increased, the rectifying effect is improved.

  Therefore, the air duct 15 can be installed in a narrow space and can supply clean air to the dryer 10 stably with a large air volume.

  In addition, the air duct concerning this invention is not limited to embodiment mentioned above, The other various structure is included.

  For example, a drier that requires a large air flow is sufficient, and thus the present invention can be applied not only to a coating apparatus but also to a printing apparatus. Since the wind for drying may not be warm air, a heating device is not essential. Although the pressure loss is reduced, the heating device may be arranged on the downstream side of the blower. The filtration case may have a circular channel cross-sectional shape. In that case, the shape of the rectifying member can be conical or spherical.

  The rectifying member may be a member in which a plurality of through holes are formed in a plate material having a certain thickness, such as a punching plate, or a lattice-like member. The rectifying member may be arranged at a position away from the air intake, but as the air gets closer to the center of the filter as it gets closer to the filter, the position of the enlarged portion is biased toward the air intake. It is preferable to arrange in the above.

DESCRIPTION OF SYMBOLS 10 Dryer 15 Air blow duct 20 Heating apparatus 30 Blower 40 Filtration case 50 Case main body 51 Enlargement part 52 Filtration part 53 Reduction part 60 Air intake 70 Air intake 80 Filter 81 Frame 82 Separator 90 Current regulating member 91 Current plate 91a Honeycomb structure 91b Frame 91c Ventilation opening 92 Inclined surface 93 Opposing surface

Claims (6)

A blower duct that sends wind for drying to the dryer,
A blower for generating an air flow;
A filter case containing a filter and installed in a flow path between the blower and the dryer;
With
The filtration case is
An air inlet opening on the blower side;
An enlarged portion formed so that the flow passage area gradually expands from the air intake port;
A filtration part in which the filter is assembled so as to partition the flow path, connected to the enlarged part,
A rectifying member having a certain thickness and having a large number of ventilation openings in the thickness direction and assembled to the enlarged portion;
Have
A blower duct in which a space between the air intake port and the filter is partitioned by the rectifying member so that an air flow is directed to a peripheral portion of the filter. In the air duct according to claim 1,
The air duct in which the rectifying member has a substantially square cross-sectional shape and is assembled so that an outer peripheral portion thereof is substantially orthogonal to an inner surface of the enlarged portion. In the ventilation duct of Claim 2,
The enlarged portion is
A pair of inclined surfaces inclined so as to gradually increase the distance from the air intake;
A pair of facing surfaces parallel to each other at both ends of the pair of inclined surfaces;
Have
The air duct in which the rectifying member is configured by assembling two members having a rectangular plate shape so as to be substantially orthogonal to each of the inclined surfaces. In the ventilation duct of Claim 2 or Claim 3,
When the thickness of the rectifying member is t, the maximum inner diameter of the ventilation opening is Φ, and the inclination angle of the enlarged portion with respect to the center line of the air inlet is θ, the formula: t> Φ / tan θ is established. The air duct that is configured to. In the ventilation duct as described in any one of Claims 1-4,
A blower duct in which the rectifying member is formed using a honeycomb structure. In the ventilation duct as described in any one of Claims 1-5,
The air duct in which the rectifying member is disposed in the vicinity of the air intake.

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