JP6639252B2 - Heating device for dryer - Google Patents

Description

  The present invention relates to a heating device used for a dryer, and more particularly, to a heating device for a dryer that is preferably used when drying with a large amount of hot air, such as clothes to be dried.

  A steam heater or a gas burner is used as a heat source for generating hot air (heating air) in the dryer.

  Among them, the gas burner has an advantage that the air required for combustion is continuously supplied by the Venturi effect, so that complete combustion is stably performed. For this reason, it is possible to use either a heat type using a heat exchanger or a direct fire type in which air is directly heated.

  However, when a direct fire type is adopted to increase the thermal efficiency, if a gas burner is provided at a location where a large amount of air flows, such as a circulation path, as in the case of using a steam heater, air is sucked at the flame outlet of the gas burner. There is a risk that the air will be excessive and the air will be excessive. In this case, the balance between the gas ejection speed and the combustion speed is broken, so that the flame disappears or a phenomenon called so-called flashback occurs.

  Patent Document 1 listed below discloses a burner device provided with flame stabilizing means for preventing the vicinity of a flame opening from becoming a negative pressure due to a surrounding forced air flow.

Japanese Patent No. 4737679

  It is a main object of the present invention to obtain high safety even if a gas burner is used without depending on a special configuration of the burner.

Means for that are provided in a circulation path through which heated air in the dryer circulates, and a heating device for a dryer that heats air with a gas burner. An upstream side plate for partitioning, a combustion chamber having a side plate extending from the upstream side plate to the downstream side in the circulation direction and partitioning from the surroundings, and the gas burner is provided at a portion on the upstream side in the circulation direction inside the combustion chamber, and the gas burner is provided. An air intake is formed outside the circulation path, and at least a portion of the combustion chamber on the upstream side in the circulation direction has a space separating the circulation path with a space between the upstream plate and the side plate of the combustion chamber. A heating device for a dryer, wherein the heating device is covered with a chamber and has an intake port formed to communicate with the outside of the circulation path to take in air around the combustion chamber .

  In this configuration, the gas burner is isolated from the heated airflow flowing through the circuit by the upstream and side plates of the combustion chamber. On the other hand, the supply of air to the gas burner is performed from an air intake provided outside the circulation path. Therefore, the gas burner can continue burning without being adversely affected by the airflow flowing in the circulation path.

  ADVANTAGE OF THE INVENTION According to this invention, since the airflow which flows around at the time of combustion of a gas burner does not have a bad influence, a high safety | security is obtained in operation of a dryer. Moreover, the present invention does not prevent the adverse effect of the air flow by the special structure attached to the gas burner, so that the operation can be continued even if the special structure is clogged.

The principal part sectional front view of the schematic structure of a tunnel finisher. AA sectional drawing in FIG. BB sectional drawing in FIG. The perspective view of a duct. FIG. 2 is a perspective view of a combustion chamber.

One embodiment for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 shows a schematic structure of a so-called tunnel finisher 11 as an example of a dryer, which is a tunnel-type finish drying device for finish-drying clothes.

  The tunnel finisher 11 includes a tunnel-shaped drying chamber 12 having a predetermined length. The drying chamber 12 is provided with a screw conveyor 15 for transporting clothes 14 hung on a hanger 13 at an upper part, an inlet 16 for heating air at an upper part, and heating air acting on the clothes 14 at a lower part. It has an outlet 17.

  The outlet 17 and the inlet 16 are connected by a circulation path 18. That is, the circulation path 18 through which the heated air circulates extends from the outlet 17 at the bottom of the tunnel finisher 11 to the side of the drying chamber 12, and extends upward along the drying chamber 12 from the tip of the outlet 18 a. It has a vertical cylinder portion 18b and an introduction portion 18c that leads from the tip of the vertical cylinder portion 18b to the inflow port 16 above the drying chamber 12. Therefore, the heated air for drying the clothes 14 flows from the outlet 17 of the drying chamber 12 to the outlet section 18a, the vertical cylindrical section 18b, the introduction section 18c, and the inlet 16 of the drying chamber 12 in this order.

  A dryer heating device 21 (hereinafter, referred to as a “heating device”) is provided below the circulation path 18, specifically, below the vertical cylindrical portion 18 c, in a state in which the drying device 12 is arranged. Further, a blower 22 is provided in the vertical cylinder portion 18b, on the downstream side in the reflux direction above the heating device 21. In addition, the circulation path 18 is provided with necessary exhaust ports and the like (not shown).

  The heating device 21 is a device that directly heats the air flowing in the circulation path 18 by the gas burner 23, and is formed in a duct 24 that forms the vertical cylindrical portion 18 b of the circulation path 18.

  FIG. 2 is a cross-sectional view of the duct 24 taken along the line AA of FIG. 1, and FIG. 3 is a cross-sectional view of the duct 24 taken along the line BB. As shown in these figures, the heating device 21 is provided with a combustion chamber 25, a rectifying section 26, and a compartment 27 in a duct 24.

  The duct 24 has a rectangular tube shape with a rectangular cross section, and the entire inside is the circulation path 18, and the outside of the duct 24 is outside the circulation path 18.

  FIG. 4 shows a perspective view of the duct 24. The heating device 21 is formed in the middle part in the left-right direction having a long length in the cross-sectional shape. The rectifying section 26 and the compartment 27 constituting the heating device 21 are divided by a partition extending in the front-rear direction with a short length in the cross-sectional shape of the duct 24. As shown in FIG. 5, the combustion chamber 25 is formed in a hollow box shape, and is mounted inside the compartment 27 with a space provided between the combustion chamber 25 and the compartment 27. Then, the gas burner 23 is accommodated in a lower part in the combustion chamber 25 as shown in FIGS.

  More specifically, first, the combustion chamber 25 is formed of heat-resistant steel, and divides the circulation path 18 between the upstream side and the downstream side as shown in FIG. A side plate 32 extends downstream from the base 31 in the circulation direction, that is, extends upward and separates from the surroundings. The length of the upstream plate 31 in the left-right direction is shorter than the length of the duct 24 in the left-right direction and shorter than the length of the duct 24 in the front-rear direction. Side plate 32 is formed. Of these four side plates 32, a burner insertion port 33 for inserting the gas burner 23 is formed below one of the side plates 32 a located on the opposite side to the drying chamber 12. The burner insertion port 33 is formed to slightly protrude from the surface of the side plate 32. The height of the side plate is set so that a sufficient space above the flame can be obtained even when the gas burner 23 is housed and burned.

  Also, the upper ends of the four side plates 32 have the same height, and a horizontal closing plate 34 that covers the entire upper end is provided at the downstream end of the combustion chamber 25 in the circulation direction, that is, at the upper end of the side plate 32. . Of the four side plates, two side plates 32b orthogonal to the side plate 32a having the burner insertion port 33 have the heat exhaust port 35.

  The heat exhaust port 35 is formed upstream of the closing plate 34 in the circulation direction, that is, below the closing plate 34. The shape, size, and number of the heat discharge ports are appropriately set. In the case where the number of the heat discharge ports 35 is one per side plate 32b and the shape of the heat discharge ports 35 is rectangular, as shown in FIG. 5, the width dimension a is set to the length over the entire width of the side plate 32b. The dimension b may be set to an appropriate length. In this case, the vertical dimension b may be short.

  As shown in FIGS. 2 and 3, the flame port 23 a is placed on the downstream side in the circulation direction, that is, on the upper side in the circulation direction inside the combustion chamber 25 having such a structure, that is, on the lower part in the combustion chamber 25. A gas burner 23 is provided. The gas burner 23 is inserted from the burner insertion port 33 and held.

  Next, the compartment 27 will be described. The compartment 27 is configured by partitioning the circulation path 18, that is, the duct 24, with a partition extending in the entire front-rear direction as described above, and as shown in FIG. The side portion is covered with a space between the upstream side plate 31 and the side plate 32 of the combustion chamber 25. Since the compartment 27 is configured by dividing the duct 24 by partitions in the front-rear direction, two surfaces of the compartment 27 in the front-rear direction are common to corresponding portions of the duct 24. That is, the compartment 27 has a bottom plate 41 extending in the horizontal direction and two vertical plates 42 extending in the vertical direction, and the bottom plate 41 and the vertical plate 42 divide the middle portion of the circulation path 18 in the left-right direction. The height at which the bottom plate 41 is formed is a position at an appropriate distance below the upstream plate 31 which is the bottom of the combustion chamber 25. The appropriate spacing is the size required to take cooling air around combustion chamber 25. The upper end position of the vertical plate 42 is lower than the upper end position of the duct 24, and is lower than the height of the heat exhaust port 35 of the combustion chamber 25 as shown in FIGS. 2 and 3.

  The side surface of the compartment 27 opposite to the drying chamber 12, that is, the surface of the combustion chamber 25 at a position corresponding to the side plate 32 a having the burner insertion port 33, that is, the surface of the duct 24 opposite to the drying chamber 12 has a circulation path. An intake port 43 is formed around the combustion chamber 25 to communicate with the outside of the intake port 18 to take in air. The intake ports 43 are formed at two places. One intake port 43 a (lower intake port) is located above the bottom plate 41 of the compartment 27 and below the upstream plate 31 of the combustion chamber 25. Another intake port 43b (upper intake port) is formed just above the lower intake port 43a and higher than the burner insertion port 33 of the combustion chamber 25.

  Since the upper intake port 43b corresponds to the burner insertion port 33 of the combustion chamber 25 when the combustion chamber 25 is attached, a portion of the upper intake port 43b above the portion corresponding to the burner insertion port 33 is the combustion chamber 25. Is a substantial intake port 44 for the air taken in around. A portion of the upper intake port 43b corresponding to the burner insertion port 33 is an air intake port 45 of the gas burner 23 formed outside the circulation path 18.

  Each of the lower intake port 43a and the upper intake port 43b is a rectangle that is slightly narrower than the width of the combustion chamber 25 in the left-right direction and is long in the left-right direction.

  Next, the rectifying unit 26 will be described. The rectifying section 26 is formed on the downstream side in the circulation direction from the combustion chamber 25 as shown in FIG. 4, and a cover plate 51 that divides a portion of the circulation path 18 corresponding to the combustion chamber 25 on the upstream side and the downstream side in the circulation direction. And a rectifying plate 52 which is formed on the outer peripheral edge of the cover plate 51 and extends to the upstream side in the circulation direction, that is, the downstream portion of the combustion chamber 25, that is, the upper portion, with a gap.

  Since the rectifying section 26 is configured by partitioning the duct 24 with a partition extending in the entire front-rear direction, the cover plate 51 extends in the horizontal direction, and the rectifier plate 52 extends in the vertical direction. The cover plate 51 is located above the closing plate 34 at the upper end of the combustion chamber 25. In the illustrated example, the cover plate 51 is formed at the upper end of the duct 24 and is rectangular. The length of the cover plate 51 in the left-right direction is longer than the length of the combustion chamber 25 in the left-right direction, and is slightly longer than the length of the compartment 27 in the left-right direction. The current plate 52 is vertically provided from both ends of the cover plate 51 in the left-right direction. The length of the current plate 52 is a length extending until it overlaps with the upper portion of the combustion chamber 25 as described above. For this reason, the downstream portion of the compartment 27 on the downstream side in the circulation direction, that is, the upper end portion, is located inside the current plate 52 with a gap between the current plate 52 and the current plate. A heat exhaust path 53 is provided between the vertical plate 42 of the compartment 27 and the rectifying plate 52 of the rectifying section 26.

  The gap between the vertical plate 42 of the compartment 27 and the rectifying plate 52 of the rectifying section 26, the overlapping width with this gap, and the like are set as appropriate.

  In the tunnel finisher 11 configured as described above, the heated air is generated and circulated as follows.

  When the gas burner 23 is ignited and the blower 22 is driven, the gas burner 23 burns while sucking air required for combustion from the air intake port 45 and heats the air in the combustion chamber 25. At this time, outside air is taken into the periphery of the combustion chamber 25 from the intake port 43 separately from the air intake port 45, so that the lower part of the combustion chamber 25 is particularly cooled and the gas burner 23 itself is prevented from being heated.

  The air in the combustion chamber 25 is directly heated by the flame of the gas burner 23, and the air around the combustion chamber 25 is indirectly heated, and moves downstream in the circulation path 18, that is, upwards. The heat of the air heated in the combustion chamber 25 exits the combustion chamber 25 through the exhaust heat port 31 formed at the upper end of the side plate 32b of the combustion chamber 25, and exits in the compartment 27 and in the rectification section 26. Go to This heat heats the air rising inside the compartment 27 along the combustion chamber 25 and the air rising inside the circulation path 18 and outside the compartment 27. The heated air is sucked up by the blower 22 and is sent to the drying chamber 12 through the inlet 18c and the inlet 16.

  The air that has entered the vertical cylindrical portion 18b from the drying chamber 12 through the outlet 17 and the outlet portion 18a rises outside the compartment 27, is heated by heat in the same manner as described above, and is supplied to the drying chamber 12. Is done. In this way, the heated air is circulated while being generated, and the clothes 14 in the drying chamber 12 are dried and finished.

  The gas burner 23 is housed in the combustion chamber 25, and air for combustion of the gas burner 23 is supplied from an air intake 45 formed outside the circulation path 18, so that the air does not contact the air circulating in the circulation path 18. is there. Therefore, even if the amount of air circulating in the circulation path 18 is large and the speed is high, stable combustion can be realized without extinguishing a flame or generating a flashback phenomenon.

  In addition, since the lower portion of the combustion chamber 25 is covered with the compartment 27 so as to form an intake port 43 for taking in outside air, and particularly the lower portion of the combustion chamber 25 is cooled, the gas burner 23 has a high temperature. Can be suppressed from being heated. As a result, the occurrence of a flashback phenomenon based on another cause other than the air flow can be prevented. For this reason, further safety can be obtained.

  Further, since the gas burner 23 is housed in the combustion chamber 25, dust and the like in the air circulating in the circulation path 18 do not come into contact with the flame, which is safe in this respect.

  In addition to the heating, the combustion chamber 25 has a closing plate 34 at an upper end portion, and the exhaust heat port 35 is formed at a position close to the closing plate 34 in the side plate 32b. Since the heat of the heated air can be discharged, the heating can be performed efficiently.

  In addition, since the heating device 21 includes the rectifying section 26, the air can be reliably heated by the heat generated from the exhaust heat port 35 of the combustion chamber 25. In particular, since the upper end portion of the compartment 27 is located inside the rectifying plate 52 of the rectifying section 26 and the exhaust heat path 53 is formed therebetween, the compartment 27 has exited from the combustion chamber 25. The heat can be returned upstream through the exhaust heat path 53, that is, downwardly against the flow in the circulation path. Therefore, the heating of the air can be performed slowly and the temperature can be reliably raised. This effect can also be enhanced by providing the blower 22 downstream of the heating device 21 in the circulation direction. That is, it is not necessary to blow the flow of air due to the driving of the blower 22 to the heating device 21, so that the airflow can be stabilized.

  In addition, since the above-described configuration separates the air flowing through the circulation path 18 from the air supplied to the gas burner 23, high safety can be expected. That is, in the case where the gas burner 23 having a configuration for restricting the flow of the air so that the flashback phenomenon does not occur, the safe operation is performed as long as the desired operation is maintained. However, for example, if clogging or the like that causes the function of the configuration to be lost occurs unexpectedly, the desired operation cannot be obtained. In this regard, since the air flow is divided as described above, even if an unexpected situation such as clogging occurs, the desired action can be maintained without being affected by the unexpected situation.

In correspondence between the configuration of the present invention and the configuration of the above embodiment,
Although the dryer of the present invention corresponds to the above-described tunnel finisher, the present invention is not limited to only the above-described configuration, and other configurations can be adopted.

  For example, the dryer may be another type of dryer such as a stationary type instead of the tunnel finisher 11, and the object to be dried may be other than the clothes 14.

  The position of the dryer heating device 21 in the circulation path 18 is not a part where air flows from bottom to top as in the above-described example, but a part that flows sideways or a part that flows from top to bottom. Good.

  The compartment 27 can be formed independently of the duct 24 forming the circulation path 18.

DESCRIPTION OF SYMBOLS 11 ... Tunnel finisher 12 ... Drying chamber 18 ... Circulation path 21 ... Dryer heating apparatus 22 ... Blower 23 ... Gas burner 25 ... Combustion chamber 27 ... Separation chamber 31 ... Upstream side plate 32 ... Side plate 34 ... Closure plate 35 ... Exhaust port 43 … Intake port 45… air intake port 51… cover plate 52… rectifier plate

Claims (6)

A heating device for a dryer, which is provided in a circulation path through which heated air in the dryer circulates, and heats the air with a gas burner,
In the circulation path, an upstream plate dividing the circulation path on the upstream side and the downstream side, and a combustion chamber having a side plate extending from the upstream plate to the downstream in the circulation direction and dividing from the surroundings,
Along with providing the gas burner at a portion on the upstream side in the circulation direction inside the combustion chamber,
An air intake of the gas burner is formed outside the circulation path ,
At least a portion of the combustion chamber on the upstream side in the circulation direction is covered with a compartment that separates the circulation path by leaving a space between the upstream side plate and the side plate of the combustion chamber,
A heating device for a dryer, wherein an intake port is formed to communicate with the outside of the circulation path to take in air around the combustion chamber . On the downstream side in the circulation direction from the combustion chamber, a lid plate is formed to partition a portion of the circulation path corresponding to the combustion chamber on the upstream side and the downstream side in the circulation direction.
The heating device for a dryer according to claim 1, wherein a rectifying plate is formed on an outer peripheral edge of the lid plate toward an upstream side in a circulation direction to a position overlapping with a downstream portion of the combustion chamber with a gap therebetween. The heating device for a dryer according to claim 2 , wherein a downstream portion that is a downstream side of the compartment in the circulation direction is located inside the rectifying plate with a gap between the rectifying plate and the rectifying plate. And has a closure plate, wherein the combustion chamber blocks the entire end of the circulation direction downstream one any one of claims 1 to 3 having a waste heat outlet from said closure plate to the side plate of the circulation upstream side The heating device for a dryer according to item 8. An apparatus for drying and finishing clothes, comprising the dryer heating device according to any one of claims 1 to 4 . The upper and lower portions of the tunnel-shaped drying chamber are connected by the circulation path,
At the lower part of the circulation path, the heating device for a dryer according to any one of claims 1 to 4 in a state where the heating device for the dryer is arranged side by side with the drying chamber,
A tunnel-type drying and finishing apparatus for clothes provided with a blower on the downstream side in the circulation direction from the heating device for the dryer.

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