JP2006207847A

JP2006207847A - Hot air drying device

Info

Publication number: JP2006207847A
Application number: JP2005016669A
Authority: JP
Inventors: Kohei Tokuda; 康平徳田
Original assignee: Canon Inc
Current assignee: Canon Inc
Priority date: 2005-01-25
Filing date: 2005-01-25
Publication date: 2006-08-10

Abstract

<P>PROBLEM TO BE SOLVED: To uniform the distribution of hot air temperature in a drying area for drying a dried object in a hot air drying device. <P>SOLUTION: In this hot air drying device having a blower means 1 generating the flow of air, a heating means 2 for increasing a temperature of the generated flow of air, and a duct means surrounding the circumference of the flow of air flowing from the blower means and having an opening portion communicating with the external to allow a dried object to be charged and discharged while forming a space to jet the flow of air to the dried object at least on the way, a projection face A through which the airflow can be passed and a projection face B through which the airflow cannot be passed, are formed on the same cross-section orthogonal to the airflow in a specific section on a downstream side of the heating means 2 with respect to the airflow generated by the blower means 1, an area of the projection face A is continuously or discontinuously increased toward the downstream side, and an area of the projection area B is decreased. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、温風乾燥装置に関し、詳しくは温風温度分布の均一化に関する。 The present invention relates to a warm air drying device, and more particularly to uniforming the warm air temperature distribution.

従来の温風乾燥装置は、広く普及しているヘアードライヤのように、ファンにより空気を送り、その送られてきた空気をヒータなどの熱源によって暖める構成になっているものがある。熱源としては電熱線ヒータが広く利用されていて、その中でも、コイル状に巻かれたものが一般的に使われている（例えば、特許文献１参照）。 Some conventional hot air dryers have a configuration in which air is sent by a fan and the sent air is heated by a heat source such as a heater, like a widely used hair dryer. As a heat source, a heating wire heater is widely used, and among them, a coil wound is generally used (for example, see Patent Document 1).

以下、図９、図１０により従来の温風乾燥装置について説明する。コイル状に巻かれた電熱線ヒータはコストが安いという利点がある反面、その形状から、ヒータ断面の電熱線密度に偏りがある。具体的には、ヒータは円筒形状でヒータコアの中央部は電熱線の密度が薄く、円周部は密度が濃くなっている。そのため、ヒータ中央部分の風は十分に暖められず、ヒータ下流の温風温度分布は図１０に示すように中央部が低く円周部が高い温度分布になってしまう。
特公昭６０‐０２７２８４号公報（第３頁、図２、図４） Hereinafter, a conventional hot air drying apparatus will be described with reference to FIGS. Although the heating wire heater wound in a coil shape has an advantage that the cost is low, the heating wire density of the heater cross section is biased due to its shape. Specifically, the heater has a cylindrical shape, and the density of the heating wire is low in the center portion of the heater core, and the density is high in the circumferential portion. Therefore, the wind at the heater central portion is not sufficiently warmed, and the temperature distribution of the hot air downstream of the heater becomes a temperature distribution with a low central portion and a high circumferential portion as shown in FIG.
Japanese Patent Publication No. 60-027284 (3rd page, FIG. 2, FIG. 4)

この、中央部の低い温度分布を是正するために、ヒータ中央部に円板状の部材を配置する方法がある。これは、中央部の電熱線密度が薄い部分の十分に暖められていない風を下流側へ直接流さないようにして、円周部の温風と混ぜる方法である。 In order to correct this low temperature distribution in the central portion, there is a method of arranging a disk-shaped member in the central portion of the heater. This is a method of mixing the warm air in the circumferential part so as not to flow the unheated wind in the portion having a low heating wire density in the central part directly to the downstream side.

ところが、ヒータ中央部に円板状の部材を取付けると、円板の後方に大きな渦が発生して流れの抵抗が大きくなり、下流では中央部の速度が遅く周辺部が速い風速分布が不均一な状態になる。通常、温風乾燥装置においては、被乾燥物を乾燥エリア内に搬入するための外部との連通口があいている。この連通口からは被乾燥物だけでなく、外気も乾燥エリア内に進入してくる。ヒータにより暖められた温風と外気が混ざると温風の温度が下がるが、このとき中央部の温風速度が遅い部分の温度が両サイドの温風速度が速い部分に比べて、より温風温度が下がってしまう。そのため、ヒータ中央部に円板状の部材を取付けると、ヒータの直後では温風温度分布を均一にできても、乾燥エリア内では中央部分の温度が低くなり、温風温度が不均一になってしまう。 However, when a disc-shaped member is attached to the center of the heater, a large vortex is generated behind the disc and the flow resistance increases, and the wind speed distribution at the center is slow and the wind speed is uneven at the downstream. It becomes a state. Usually, in the hot air drying apparatus, there is a communication port with the outside for carrying an object to be dried into the drying area. From this communication port, not only objects to be dried but also outside air enters the drying area. When warm air warmed by the heater and outside air are mixed, the temperature of the warm air decreases.At this time, the temperature of the part where the warm air speed is slow in the center is higher than that of the part where the warm air speed is fast on both sides. The temperature drops. For this reason, if a disk-shaped member is attached to the center of the heater, the temperature of the central part will be low in the drying area even if the hot air temperature distribution can be made uniform immediately after the heater. End up.

本発明は、以上の点に着目して成されたもので、被乾燥物を乾燥させる乾燥エリア内の温風温度の分布を均一化させる温風乾燥装置を提供することを目的とする。 This invention is made paying attention to the above point, and it aims at providing the warm air drying apparatus which makes uniform the distribution of the warm air temperature in the drying area which dries to-be-dried material.

そこで、上記課題を解決するために本発明においては、空気の流れを発生させる送風手段と、発生させた空気の流れの温度を上昇させる加熱手段と、前記送風手段から流入した空気の流れの周囲を囲み少なくともその途中で空気の流れを被乾燥物へ吹きつけるような空間を形成しつつ被乾燥物の進入及び排出のために外部と連通する開口部を有するダクト手段を持つ温風乾燥装置において、前記送風手段が発生する気流から見て前記加熱手段の下流側に取付けられ、部分的に気流を遮断し、その下流側では連続的、または不連続に気流の遮断を解消する整流手段をもつことを特徴とする温風乾燥装置。 Therefore, in order to solve the above-mentioned problems, in the present invention, a blowing means for generating an air flow, a heating means for raising the temperature of the generated air flow, and the surroundings of the air flow flowing in from the blowing means In a hot air drying apparatus having duct means having an opening communicating with the outside for entering and discharging the object to be dried while forming a space that blows an air flow to the object to be dried at least in the middle , Attached to the downstream side of the heating means when viewed from the air flow generated by the air blowing means, and has a rectifying means for partially blocking the air flow and removing the air flow interruption continuously or discontinuously on the downstream side. A hot air drying apparatus characterized by that.

本発明によれば、温風乾燥装置においてヒータの発熱体密度が疎の部分の下流に流れを遮る部材を取付けることで、発熱体密度が疎の部分を通ってきた十分に暖められていない冷風を直接下流側へ流さず、かつ、流れを遮る部材を下流側へ向かう突起を持つ形状にすることによって、部材の下流での大きな渦の発生を抑え、その突起に沿って温風を集めることができる。したがって、下流でも温風の温度分布と速度分布は均一なまま流れていく。 According to the present invention, in the hot air drying apparatus, by attaching a member that blocks the flow downstream of the heater with a low density of the heating element, the cold air that has not been sufficiently heated has passed through the portion with the low density of the heating element. By making the member that blocks the flow downstream and the protrusion with the protrusion toward the downstream, the generation of large vortices downstream of the member is suppressed, and hot air is collected along the protrusion. Can do. Therefore, the temperature distribution and the velocity distribution of the warm air flow even downstream.

以下本発明を実施するための最良の形態を、実施例により詳しく説明する。 Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to examples.

実施例１として、プリンタ装置に取付けられ、プリンタ装置によって記録シートに印刷された画像を乾燥させる温風乾燥装置について説明する。図１は本実施例装置の温風乾燥装置の全体構成図であり、図２は本実施例の温風乾燥装置が内蔵されているプリンタ装置の全体構成図である。 As a first embodiment, a hot air drying apparatus that is attached to a printer apparatus and that dries an image printed on a recording sheet by the printer apparatus will be described. FIG. 1 is an overall configuration diagram of the hot air drying device of the apparatus of this embodiment, and FIG. 2 is an overall configuration diagram of a printer apparatus incorporating the hot air drying device of the present embodiment.

プリンタ装置により記録シートに画像が印刷され、その画像の乾燥をおこなう工程について説明する。 A process for printing an image on a recording sheet by the printer and drying the image will be described.

図２のプリンタ装置は記録手段であるインクジェットヘッド２１を有し、記録シートＳにインクを吐出することにより画像を記録する。記録シートＳには、幅・長さが一定サイズ（例えばＡ４サイズなど）のカットシートと、幅が一定サイズで長さが例えば数十〜数百メートルのロール状に巻かれたロールシートがあり、本装置では双方とも使用可能である。記録シートＳは、給紙ローラセット２７によってインクジェットヘッド２１下方へと搬送され、画像記録を開始する。記録シートＳは画像を記録されながら搬送され、乾燥エリア５内に進入し画像形成インクが乾燥する。乾燥エリア５より排出された記録シートＳはカッタ２８によってカットされ印刷工程が終了する。 The printer apparatus of FIG. 2 has an inkjet head 21 as recording means, and records an image by ejecting ink onto the recording sheet S. The recording sheet S includes a cut sheet having a constant width and length (for example, A4 size) and a roll sheet wound into a roll having a constant width and a length of, for example, several tens to several hundred meters. Both can be used in this apparatus. The recording sheet S is conveyed below the inkjet head 21 by the paper feed roller set 27 and starts image recording. The recording sheet S is conveyed while an image is recorded, and enters the drying area 5 to dry the image forming ink. The recording sheet S discharged from the drying area 5 is cut by the cutter 28, and the printing process is completed.

次に、画像が印刷された記録シートＳの乾燥をおこなう温風乾燥装置について説明する。温風乾燥装置のケーシングは断熱性の高い素材で作られていて、温風の温度上昇の効率が上がるようにしてある。温風乾燥装置の最上流部には送風ファン１が設置されている。送風ファン１はシロッコファン、軸流ファンのどちらでも使用可能で、ファンの吸入口より外気を吸込み、下流側にあるヒータ２に向かって風を送っている。送風ファン１より送られた風はヒータ２によって暖められる。 Next, a hot air drying apparatus for drying the recording sheet S on which an image is printed will be described. The casing of the hot air drying device is made of a highly heat-insulating material so that the temperature rise efficiency of the hot air is increased. The blower fan 1 is installed in the most upstream part of the warm air drying device. The blower fan 1 can be either a sirocco fan or an axial fan, sucks outside air from the fan inlet, and sends air toward the heater 2 on the downstream side. The wind sent from the blower fan 1 is warmed by the heater 2.

ヒータ２は図６に示すように電熱線をコイル状に巻き、それを更に十字型に組まれたヒータ基材にコイル状に巻きつけて作られた、ヘアードライヤなどで広く使われているものである。電熱線をコイル状に巻くことによって、送風との接触面積を増やし、効率的に温風を作り出すことができる。ヒータ２に電流を流すことによって電熱線が発熱し、その熱によって送風ファン１より送られた風が暖められ、温風になる。ヒータ２に流す電流値を変えることによって電熱線の発熱量を変化させて、所望の温風温度を得ることができる。しかし、ヒータ２はヒータ基材にコイル状に巻かれているため、中央部分は電熱線の密度が疎に、端の円周部分は電熱線の密度が密になっている。そのため、送風ダクト４の壁側を通ってきた風は電熱線に触れている時間が長いので十分に暖められるが、中央部分を通ってきた風は電熱線にほとんど触れないので十分に暖められず、冷風としてそのまま流れていく。この中央部の冷風が下流側に流れていってしまうと、乾燥エリア内の温度分布が不均一になってしまうので、それを防ぐために本実施例ではヒータ２の中央部分の下流に円錐部材６が取付けてある。ヒータ２から円錐部材６にかけての風の流れについて図３を用いて説明する。 As shown in FIG. 6, the heater 2 is widely used in a hair dryer or the like, which is formed by winding a heating wire in a coil shape and then winding it in a coil shape around a heater base material assembled in a cross shape. It is. By winding the heating wire in a coil shape, it is possible to increase the contact area with the blower and efficiently generate hot air. When a current is passed through the heater 2, the heating wire generates heat, and the wind sent from the blower fan 1 is warmed by the heat to become warm air. A desired hot air temperature can be obtained by changing the amount of heat generated by the heating wire by changing the value of the current flowing through the heater 2. However, since the heater 2 is wound around the heater base material in a coil shape, the density of the heating wire is sparse in the central portion, and the density of the heating wire is dense in the circumferential portion at the end. For this reason, the wind that has passed through the wall side of the air duct 4 is sufficiently warmed because it has been in contact with the heating wire for a long time, but the wind that has passed through the central portion is hardly heated because it hardly touches the heating wire. It flows as cold air. If the cold air in the central portion flows downstream, the temperature distribution in the drying area becomes non-uniform. To prevent this, in this embodiment, the conical member 6 is provided downstream of the central portion of the heater 2. Is installed. The flow of wind from the heater 2 to the conical member 6 will be described with reference to FIG.

図３は図１における矢印Ｘ方向から見た送風ダクト４の断面図である。中央部を流れてきた冷風は、円錐部材６の底面によって遮られるので、そのまま下流へ流れることはない。円錐部材６の底面にぶつかった冷風は図３の破線に示すように外側へ向かって流れていき、ヒータ２の電熱線の密な円周部を通ってきた温風（実線）と混ざる。円錐部材６と送風ダクト４の外壁との隙間Ａは送風ダクト４の断面積Ｂに比べて狭いので、絞りの効果によって円周部を通ってきた温風と中央部からの冷風とがしっかりと混ざり、隙間Ａを通り抜ける温風の温度分布は均一化される。温度分布が均一になった温風は、円錐部材６の底面によって送風ダクト４の外周部に分けられているが、円錐部材６は下流に向かう突起を持っているので、その突起に沿って温風はスムーズに流れていき、中央部分にも温風が集まってくる。 3 is a cross-sectional view of the air duct 4 as viewed from the direction of the arrow X in FIG. The cold air that has flown through the central portion is blocked by the bottom surface of the conical member 6 and therefore does not flow downstream. The cold air hitting the bottom surface of the conical member 6 flows outward as indicated by the broken line in FIG. 3 and mixes with the warm air (solid line) that has passed through the dense circumferential portion of the heating wire of the heater 2. Since the gap A between the conical member 6 and the outer wall of the air duct 4 is narrower than the cross-sectional area B of the air duct 4, the hot air that has passed through the circumference due to the restriction and the cold air from the center are firmly attached. The temperature distribution of the warm air mixed and passing through the gap A is made uniform. The warm air having a uniform temperature distribution is divided into the outer peripheral portion of the air duct 4 by the bottom surface of the conical member 6. However, since the conical member 6 has a protrusion toward the downstream, the warm air flows along the protrusion. The wind flows smoothly and warm air gathers at the center.

更に、円錐部材６と送風ダクト４の外壁との隙間Ａを温風が通り抜けるときに、図４に示すように円錐部材６の角部Ｃで流れが剥離するが、すぐに円錐部材６の側面に再付着するため大きな渦が発生しない。よって、従来例に示したような円板部材のみの場合に比べて流れの抵抗が少なく、円錐部材６の下流の風速分布も均一な状態で流れていく。 Further, when hot air passes through the gap A between the conical member 6 and the outer wall of the air duct 4, the flow is separated at the corner C of the conical member 6 as shown in FIG. Large vortex does not occur because it adheres again. Therefore, the flow resistance is less than in the case of only the disk member as shown in the conventional example, and the wind speed distribution downstream of the conical member 6 flows in a uniform state.

送風ダクト４内で円錐部材６によって温度分布と風速分布が均一化された温風は、乾燥エリア５で記録シートＳに吹きつけられる。乾燥エリア５には外部との連通口７があいていて、そこから画像が印刷された記録シートＳが搬入されてくる。乾燥エリア５において、温風を記録シートＳに吹きつけて乾燥をおこなう。乾燥エリア５内の温度が上昇することで空気の飽和水蒸気量が上がり、記録シートＳに吹きつけられた画像形成インクの水分が温風中へと移動して、画像形成インクと記録シートＳが乾く。多量の水蒸気を含んだ温風は排気ダクト９を通り、排気ファン１０によって機外に排気される。また、温風によって乾燥された記録シートＳは後端連通口８より乾燥装置外に搬送される。 The warm air whose temperature distribution and wind speed distribution are made uniform by the conical member 6 in the blower duct 4 is blown onto the recording sheet S in the drying area 5. The drying area 5 has a communication port 7 to the outside, from which the recording sheet S on which an image is printed is carried. In the drying area 5, warm air is blown onto the recording sheet S for drying. As the temperature in the drying area 5 rises, the amount of saturated water vapor in the air increases, the moisture of the image forming ink blown to the recording sheet S moves into the warm air, and the image forming ink and the recording sheet S are moved. Dry. The warm air containing a large amount of water vapor passes through the exhaust duct 9 and is exhausted to the outside by the exhaust fan 10. Further, the recording sheet S dried by the warm air is conveyed from the rear end communication port 8 to the outside of the drying apparatus.

画像が印刷された記録シートＳが搬入されてくる連通口７からは、記録シートＳだけでなく、外気も流入してくる。この流入してきた外気は、送風ダクト４を通ってきた温風と混ざる。しかし、外気の流入量は温風の流量に比べて小さいので、温風温度の低下は少なく、また、温風の風速分布は連通口７の幅方向、すなわち、記録シートの幅方向に均一であるので、外気の流入により温度が低下しても幅方向の温度分布は均一なままである。したがって、記録シートＳにあたる温風温度が幅方向で均一であるので、記録シートＳも均一に乾燥される。 Not only the recording sheet S but also the outside air flows from the communication port 7 into which the recording sheet S on which the image is printed is carried. The inflowing outside air is mixed with warm air that has passed through the air duct 4. However, since the inflow of outside air is small compared to the flow rate of the warm air, the decrease in the warm air temperature is small, and the wind speed distribution of the warm air is uniform in the width direction of the communication port 7, that is, in the width direction of the recording sheet. Therefore, the temperature distribution in the width direction remains uniform even if the temperature is lowered due to the inflow of outside air. Accordingly, since the hot air temperature corresponding to the recording sheet S is uniform in the width direction, the recording sheet S is also dried uniformly.

本実施例ではプリンタ装置に取付けられた温風乾燥装置について説明したが、本発明は印刷済み記録シートの乾燥に限らず、干物や洗濯物など温風乾燥を利用するものには全て適用できる。 In the present embodiment, the hot air drying apparatus attached to the printer apparatus has been described. However, the present invention is not limited to drying of printed recording sheets, but can be applied to any apparatus using hot air drying such as dried food and laundry.

実施例２として、実施例１とは逆に中央部分の発熱体密度が密で、外側の発熱体密度が疎のヒータを使用した場合について説明する。この構成は、ヒータとしてハロゲンヒータ等を使用した場合に、熱害のためにダクト壁をヒータに近づけることができないときに有効である。装置の構成については実施例１と同様にプリンタ装置に取付けられた温風乾燥装置として説明する。 As Example 2, a case where a heater having a dense heating element density in the central portion and a sparse outer heating element density is used as opposed to Example 1 will be described. This configuration is effective when the duct wall cannot be brought close to the heater due to heat damage when a halogen heater or the like is used as the heater. The configuration of the apparatus will be described as a hot air drying apparatus attached to the printer apparatus as in the first embodiment.

図５は実施例２の温風乾燥装置のヒータと整流部材を示したものである。 FIG. 5 shows a heater and a rectifying member of the hot air drying apparatus of the second embodiment.

実施例１と同様に、画像を印刷された記録シートＳが乾燥エリア５にある連通口７を通って搬送され、温風を吹きつけられて、記録シートＳの乾燥がおこなわれる。乾いた記録シートＳは後端連通口８より温風乾燥装置外に搬送される。温風乾燥装置も実施例１と同様に、送風ファン１により送られた風が、ヒータ２で暖められて、送風ダクト４を通って乾燥エリア５へと流れていく。乾燥エリア５で記録シートＳを乾燥させ、水蒸気を多量に含んだ温風は、排気ダクト９を通って、排気ファン１０より機外へと排気される。 As in the first embodiment, the recording sheet S on which an image is printed is conveyed through the communication port 7 in the drying area 5 and blown with hot air, whereby the recording sheet S is dried. The dried recording sheet S is conveyed from the rear end communication port 8 to the outside of the hot air drying apparatus. Similarly to the first embodiment, the warm air drying apparatus is also heated by the heater 2, and the wind sent by the blower fan 1 flows through the blower duct 4 to the drying area 5. The recording sheet S is dried in the drying area 5, and the warm air containing a large amount of water vapor is exhausted from the exhaust fan 10 to the outside of the apparatus through the exhaust duct 9.

ヒータと整流部材付近の温風の流れについて図５を用いて説明する。 The flow of warm air near the heater and the rectifying member will be described with reference to FIG.

ヒータ１２は中央部の発熱体密度が密で、外側の発熱体密度が疎であるので、送風ダクト４の中央部を通ってきた風はヒータ１２により十分に暖められるが、送風ダクト４の壁面付近を通ってきた風はあまり暖められず、冷風のままである。この外側の冷風を直接下流へと流さないようにするために、ヒータ１２の発熱体密度が疎である送風ダクト４の壁面付近に整流部材１３が取付けられている。整流部材１３は、温風の流れ方向と直交する面と、流れ方向に沿った面とにより構成されている。この整流手段１３により、温風の流路は頂点が上流側に向いた円錐若しくは多角錐の一部を含んだ形状になっている。整流部材１３の流れ方向と直交する面にぶつかった冷風は、その面に沿って送風ダクト４の中央付近へと集まってくる。中央付近に集まってきた冷風は、ヒータ１２の発熱体密度が密の部分を通り十分に暖められた温風と混ざる。整流部材１３によって温風の流路は狭められているので、絞りの効果によって中央部分を流れてきた温風と中央付近に集められた冷風はよく混ざり、温風の温度分布は均一化される。温度分布が均一化された温風は整流部材１３の斜面に沿って流れていく。整流部材１３によって温風の流路は連続的に広げられていくので、流れの抵抗は少なく、温風はスムーズに流れていく。よって、大きな渦が発生することはなく、整流部材１３を通り抜けた温風は、温度分布も風速分布も一様になっている。送風ダクト４を通って乾燥エリア５に到達した温風は、幅方向の温度分布も速度分布も均一な流れであるので、連通口７から流入してくる外気と混ざっても均一な温度分布は保たれたまま、乾燥エリア５内を下流側へと流れていく。乾燥エリア５内の温風は記録シートＳの幅方向に温度分布が均一なので、記録シートＳの乾燥ムラができることはなく、均一な乾燥がおこなわれる。 Since the heater 12 has a dense heating element density at the center and a low density of the outer heating element, the wind passing through the center of the air duct 4 is sufficiently warmed by the heater 12. The wind that has passed through the area is not very warm and remains cold. In order to prevent the outside cold air from flowing directly downstream, a rectifying member 13 is attached in the vicinity of the wall surface of the air duct 4 where the heater 12 has a low heating element density. The rectifying member 13 includes a surface perpendicular to the flow direction of the warm air and a surface along the flow direction. By this rectifying means 13, the flow path of the warm air has a shape including a part of a cone or a polygonal pyramid whose apex is directed upstream. The cold air that has collided with the surface orthogonal to the flow direction of the rectifying member 13 gathers near the center of the air duct 4 along that surface. The cool air that has gathered near the center is mixed with warm air that has been sufficiently warmed through the portion where the heating element density of the heater 12 is dense. Since the flow path of the warm air is narrowed by the rectifying member 13, the warm air flowing through the central portion by the effect of the restriction and the cold air collected near the center are well mixed, and the temperature distribution of the warm air is made uniform. . The warm air having a uniform temperature distribution flows along the slope of the rectifying member 13. Since the flow path of the hot air is continuously expanded by the rectifying member 13, the flow resistance is small and the hot air flows smoothly. Therefore, no large vortex is generated, and the temperature distribution and the wind speed distribution of the warm air passing through the rectifying member 13 are uniform. The warm air that has reached the drying area 5 through the air duct 4 has a uniform temperature distribution and velocity distribution in the width direction, so even if it mixes with the outside air flowing in from the communication port 7, the uniform temperature distribution is While being kept, it flows in the drying area 5 to the downstream side. Since the temperature distribution of the hot air in the drying area 5 is uniform in the width direction of the recording sheet S, the recording sheet S is not unevenly dried, and uniform drying is performed.

記録シートＳを乾かし、多量の水蒸気を含んだ温風は排気ダクト９を通り、排気ファン１０により機外へと排気される。一方、乾燥された記録シートＳは後端連通口８より乾燥エリア５の外へと搬送される。 The recording sheet S is dried, and warm air containing a large amount of water vapor passes through the exhaust duct 9 and is exhausted to the outside by the exhaust fan 10. On the other hand, the dried recording sheet S is conveyed out of the drying area 5 through the rear end communication port 8.

本実施例２においては実施例１と同様にプリンタ装置に付属した温風乾燥装置について説明したが、本実施例の発明は印刷済み記録シートの乾燥に限らず、温風乾燥を使用するもの全てに適用することができる。 In the second embodiment, the hot air drying apparatus attached to the printer apparatus has been described as in the first embodiment. However, the invention of the present embodiment is not limited to the drying of the printed recording sheet, and all those using hot air drying are used. Can be applied to.

実施例３として、実施例１と同様なヒータ構成で整流部材の形状が多角錐である場合について説明する。ヒータの形状や温風乾燥装置の構成などは実施例１と同様である。 As Example 3, the case where the shape of the rectifying member is a polygonal pyramid with the same heater configuration as in Example 1 will be described. The shape of the heater and the configuration of the hot air drying device are the same as in the first embodiment.

温風乾燥装置内の温風の流れは実施例１と同様に、送風ファン１により送られた風が、ヒータ２で暖められて、送風ダクト４を通って乾燥エリア５へと流れていく。乾燥エリア５で被乾燥物を乾燥させ、水蒸気を多量に含んだ温風は、排気ダクト９を通って、排気ファン１０より機外へと排気される流れである。 As in the first embodiment, the flow of warm air in the warm air drying apparatus is such that the wind sent by the blower fan 1 is warmed by the heater 2 and flows to the drying area 5 through the blower duct 4. The warm air containing a large amount of water vapor after drying the object to be dried in the drying area 5 is a flow that is exhausted from the exhaust fan 10 to the outside through the exhaust duct 9.

ヒータ２は電熱線をコイル状に巻いたものであり、円周部は電熱線が密であるが、中央部は電熱線密度が疎である。そのため、ヒータ２の中央部分を通ってきた風は十分に暖められず、冷風としてそのまま流れていってしまう。この冷風が乾燥エリア内に直接流れていかないように、本実施例では図７に示すようにヒータ２の下流に多角錐部材３５が設置されている。この多角錐部材３５周辺の風の流れは図８に示すように流れていく。ヒータ２の中央付近を流れてきた十分に暖められていない冷風（破線）は、多角錐部材３５の底面に遮られて、送風ダクト４の周辺部へと流れていく。送風ダクト４の周辺部へと流された冷風は、ヒータ２の電熱線が密な円周部を通ってきた温風（実線）と混ざる。多角錐部材３５と送風ダクト４の内壁との隙間は、送風ダクト４の断面積よりも狭いので、絞りの効果により、冷風と温風が十分に混ざり、温風の温度分布は均一化される。温度分布が均一化された温風は、多角錐部材３５の斜面に沿って流れていき、送風ダクト４の中央付近にも集まってくる。よって、ヒータ２の下流側に多角錐部材３５を取付けることにより、温風の温度分布を均一化することができる。 The heater 2 is obtained by winding a heating wire in a coil shape, and the heating wire is dense in the circumferential portion, but the heating wire density is sparse in the central portion. Therefore, the wind that has passed through the central portion of the heater 2 is not sufficiently warmed and flows as it is as cold air. In this embodiment, a polygonal pyramid member 35 is installed downstream of the heater 2 as shown in FIG. 7 so that the cold air does not flow directly into the drying area. The flow of wind around the polygonal pyramid member 35 flows as shown in FIG. The cold air (broken line) that has not been sufficiently warmed flowing near the center of the heater 2 is blocked by the bottom surface of the polygonal pyramid member 35 and flows to the periphery of the air duct 4. The cool air that has flowed to the periphery of the air duct 4 is mixed with the warm air (solid line) through which the heating wire of the heater 2 has passed through a dense circumferential portion. Since the gap between the polygonal pyramid member 35 and the inner wall of the air duct 4 is narrower than the cross-sectional area of the air duct 4, cold air and hot air are sufficiently mixed by the effect of the restriction, and the temperature distribution of the hot air is made uniform. . The warm air having a uniform temperature distribution flows along the slope of the polygonal pyramid member 35 and also gathers near the center of the air duct 4. Therefore, by attaching the polygonal pyramid member 35 to the downstream side of the heater 2, the temperature distribution of the hot air can be made uniform.

以上のように、多角錐形状の整流部材でも実施例１で説明した円錐形状の整流部材と同等の効果があり、乾燥エリア５内の温風温度分布を均一にできる。 As described above, the polygonal pyramid-shaped rectifying member has the same effect as the conical rectifying member described in the first embodiment, and the hot air temperature distribution in the drying area 5 can be made uniform.

実施例１の温風乾燥装置の主要部分構成図Main part block diagram of warm air drying apparatus of Example 1 実施例１の温風乾燥装置内蔵のプリンタ装置構成図FIG. 1 is a configuration diagram of a printer apparatus with a built-in hot air drying apparatus according to Embodiment 1. 実施例１の送風ダクトの断面図Sectional drawing of the ventilation duct of Example 1 円錐部材近傍の流れの模式図Schematic diagram of the flow near the conical member 実施例２の送風ダクトの断面図Sectional drawing of the air duct of Example 2. 電熱線ヒータの構造を示す図Diagram showing structure of heating wire heater 実施例３のヒータ及び多角錐部材を示す図The figure which shows the heater and polygonal-pyramid member of Example 3. 実施例３の送風ダクトの断面図Sectional drawing of the air duct of Example 3. 従来例のヒータ断面図Cross section of conventional heater 図９のＥ−Ｆ断面での温度分布を示す図The figure which shows the temperature distribution in the EF cross section of FIG.

符号の説明Explanation of symbols

１送風ファン
２ヒータ
４送風ダクト
５乾燥エリア
６円錐部材
７連通口
８後端連通口
９排気ダクト
１０排気ファン
１２ヒータ
１３整流部材
２１インクジェットヘッド
２７給紙ローラセット
２８カッタ
３１ヒータ基材
３２電熱線
３５多角錐部材
Ｓ記録シート DESCRIPTION OF SYMBOLS 1 Blower fan 2 Heater 4 Blower duct 5 Drying area 6 Conical member 7 Communication port 8 Rear end communication port 9 Exhaust duct 10 Exhaust fan 12 Heater 13 Rectification member 21 Inkjet head 27 Paper feed roller set 28 Cutter 31 Heater base material 32 Heating wire 35 Polygonal pyramid member S Recording sheet

Claims

空気の流れを発生させる送風手段と、発生させた空気の流れの温度を上昇させる加熱手段と、前記送風手段から流入した空気の流れの周囲を囲み少なくともその途中で空気の流れを被乾燥物へ吹きつけるような空間を形成しつつ被乾燥物の進入及び排出のために外部と連通する開口部を有するダクト手段を持つ温風乾燥装置において、
前記送風手段が発生する気流からみて前記加熱手段の下流側の一定区間内には、気流と直交する同一断面内において、気流の通過可能な投影面Ａと通過不可能な投影面Ｂがあり、下流に向かうにしたがい連続的または不連続に投影面Ａの面積が増加し、投影面Ｂの面積が減少することを特徴とする温風乾燥装置。 A blowing means for generating an air flow, a heating means for raising the temperature of the generated air flow, and surrounding the air flow flowing in from the blowing means at least in the middle of the air flow to the object to be dried In a hot air drying apparatus having duct means having an opening communicating with the outside for entry and discharge of an object to be dried while forming a space to be blown,
In a fixed section on the downstream side of the heating means as seen from the air flow generated by the air blowing means, there are a projection surface A through which the air flow can pass and a projection surface B through which the air flow cannot pass, in the same cross section orthogonal to the air flow, A warm air drying apparatus characterized in that the area of the projection surface A increases and the area of the projection surface B decreases continuously or discontinuously as it goes downstream.

請求項１記載の温風乾燥装置において、
前記加熱手段は気流と直交する断面において異なる密度で配置される発熱体を有し、投影面Ｂが設置されるのは、前記発熱体の密度が一定以下の部分であることを特徴とする温風乾燥装置。 In the warm air drying device according to claim 1,
The heating means has heating elements arranged at different densities in a cross section orthogonal to the air flow, and the projection plane B is installed at a temperature where the density of the heating elements is not more than a certain value. Wind drying device.

請求項１又は請求項２記載の温風乾燥装置において、
投影面Ｂにより形成される立体の形状は、頂点が下流側に向いた円錐の少なくとも一部を含んだ形状になっていることを特徴とする温風乾燥装置。 In the warm air drying apparatus according to claim 1 or 2,
The hot air drying apparatus characterized in that the three-dimensional shape formed by the projection surface B is a shape including at least a part of a cone whose apex is directed to the downstream side.

請求項１又は請求項２記載の温風乾燥装置において、
投影面Ｂにより形成される立体の形状は、頂点が下流側に向いた多角錐の少なくとも一部を含んだ形状になっていることを特徴とする温風乾燥装置。 In the warm air drying apparatus according to claim 1 or 2,
The hot air drying apparatus characterized in that the three-dimensional shape formed by the projection surface B is a shape including at least a part of a polygonal pyramid whose apex faces downstream.

請求項１又は請求項２記載の温風乾燥装置において、
投影面Ａにより形成される立体の形状は、頂点が上流側に向いた円錐の少なくとも一部を含んだ形状となっていることを特徴とする温風乾燥装置。 In the warm air drying apparatus according to claim 1 or 2,
The hot air drying apparatus characterized in that the three-dimensional shape formed by the projection surface A is a shape including at least a part of a cone whose apex is directed upstream.

請求項１又は請求項２記載の温風乾燥装置において、
投影面Ａにより形成される立体の形状は、頂点が上流側に向いた多角錐の少なくとも一部を含んだ形状となっていることを特徴とする温風乾燥装置。 In the warm air drying apparatus according to claim 1 or 2,
The hot air drying apparatus characterized in that the three-dimensional shape formed by the projection surface A is a shape including at least a part of a polygonal pyramid whose apex is directed upstream.