JP2007206110A - Dustproof filter clog detection device and display device using the same - Google Patents

Dustproof filter clog detection device and display device using the same Download PDF

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JP2007206110A
JP2007206110A JP2006021651A JP2006021651A JP2007206110A JP 2007206110 A JP2007206110 A JP 2007206110A JP 2006021651 A JP2006021651 A JP 2006021651A JP 2006021651 A JP2006021651 A JP 2006021651A JP 2007206110 A JP2007206110 A JP 2007206110A
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temperature
fan
detection
detection device
dustproof filter
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JP4929736B2 (en
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Shintaro Kugimiya
伸太郎 釘宮
Miyuki Ikeda
幸 池田
Hirotoshi Kemi
浩敏 毛見
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Hitachi Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of a conventional system, wherein when a filter becomes clogged, the temperature in a ventilation duct increases, and thus a difference between the outside temperature and inside temperature is detected to determine, based on a fixed threshold, whether the filter has been clogged, in which case the increase in temperature difference is small and a temperature detecting circuit fluctuates, which make it difficult to detect the difference and is likely to cause malfunctions, and the consideration, for effective detection in the system of cooling two or more heat generating bodies, is not taken. <P>SOLUTION: A control device, using two or more fans, adopts the system in which the filter also serves as the ventilation duct. In this system, a temperature detection circuit is disposed on the side of a low-pressure control fan in the duct, because the current of air in the duct is drawn by a higher-pressure control fan, when the filter is clogged. Since with this configuration the difference between the outside air temperature and the inside air temperature is increased, to immediate detection of the clogging of the dustproof filter becomes possible. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、防塵用のフィルタを通した風を用いて熱源を空冷する表示装置に係り、特に防塵用のフィルタの目詰まり検出する目詰まり検出装置に関する。   The present invention relates to a display device that air-cools a heat source using wind passing through a dustproof filter, and more particularly to a clogging detection device that detects clogging of a dustproof filter.

下記特許文献１には、装置の内部温度と外部温度とを検出し、内部温度と外部温度との温度差を求め、その温度差が正常温度差内にあるか否かを判定し、給排気口（フィルタを含む）もしくはファンの異常を判定する。そして、ファンの回転数が正常である場合は、給排気口が塞がれた状態（目づまり）であると判定する技術が開示されている。   In Patent Document 1 below, the internal temperature and the external temperature of the apparatus are detected, the temperature difference between the internal temperature and the external temperature is obtained, it is determined whether the temperature difference is within the normal temperature difference, Determine mouth (including filter) or fan abnormality. And when the rotation speed of a fan is normal, the technique which determines with it being the state (clogging) with which the air supply / exhaust port was block | closed is disclosed.

下記特許文献２には、ファンの回転数に応じた回転信号に基づいて、フィルタの目詰まりを判断する技術が開示されている。   Patent Document 2 below discloses a technique for determining clogging of a filter based on a rotation signal corresponding to the rotation speed of a fan.

特開２００２−３５７３１７号公報JP 2002-357317 A 特開２００２−６２５８９号公報JP 2002-62589 A

上記特許文献１、２では、筐体内に許容温度の異なる複数の発熱体（部品）がある場合、具体的には、例えば、許容温度が高い光源などの発熱体（部品）と許容温度が低い表示素子（例えば、液晶パネルなど）の発熱体（部品）がある場合における効果的な目詰まり検出技術については考慮されていない。   In Patent Documents 1 and 2, when there are a plurality of heating elements (components) having different allowable temperatures in the housing, specifically, for example, a heating element (component) such as a light source having a high allowable temperature and the allowable temperature are low. An effective clogging detection technique when there is a heating element (component) of a display element (for example, a liquid crystal panel) is not considered.

本発明は、上記した実情に鑑みてなされたもので、その目的は、その許容温度が異なる少なくとも２つの発熱体（熱源）を、それぞれ冷却能力が異なるファンを用いて冷却する冷却装置において、防塵フィルタの目詰まり時の外気と通気ダクト内の温度差を増加させ、防塵フィルタの目詰まり検出の誤動作を低減すると共に、低コスト化が図れる防塵フィルタの目詰まり検出装置を提供することにある。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a dustproof unit for cooling at least two heating elements (heat sources) having different allowable temperatures using fans having different cooling capacities. It is an object of the present invention to provide a dustproof filter clogging detection device capable of increasing the temperature difference between the outside air and the ventilation duct when the filter is clogged, reducing the malfunction of the dustproof filter clogging detection, and reducing the cost.

本発明の一面は、筐体の上面、下面、側面の何れか一面に設けられた防塵フィルタの目詰まりを検出する検出装置であって、少なくとも第１及び第２の発熱体と、前記防塵フィルタから風を吸入して前記第１の発熱体を冷却する第１のファンと、前記防塵フィルタから風を吸入して前記第２の発熱体を冷却し、前記第１のファンと回転数が異なる第２のファンと、前記防塵フィルタからの風を、所定の場所から、前記第１のファンに導く部分と前記第２のファンに導く部分とに分割する分割部を有するダクトと、前記装置外の温度を検出し、前記装置外に配置された第１の温度検出部と、前記装置内の温度を検出し、前記装置内に配置された第２の温度検出部と、前記第１の温度検出部で検出された温度と、前記第２の温度検出部で検出された温度との差温度を検出し、前記差温度が所定の閾値の範囲内にあるか否かを判定する制御部とを有する。   One aspect of the present invention is a detection device that detects clogging of a dustproof filter provided on any one of an upper surface, a lower surface, and a side surface of a housing, and includes at least first and second heating elements, and the dustproof filter. A first fan that cools the first heating element by sucking wind from the air and a second fan that cools the second heating element by sucking wind from the dustproof filter, and the rotational speed is different from that of the first fan. A duct having a second fan, a split section that divides the wind from the dust-proof filter from a predetermined location into a portion leading to the first fan and a portion leading to the second fan; And a first temperature detector disposed outside the device, a temperature inside the device, a second temperature detector disposed in the device, and the first temperature. The temperature detected by the detection unit and the temperature detected by the second temperature detection unit It detects a difference temperature between the temperature, the difference temperature and a determining controller whether within a predetermined threshold.

本発明によれば、防塵フィルタの目詰まり検出の誤動作を低減することができる。また、通気ダクト内の内部温度を検出する温度検出回路を一つにできるので、低コスト化が図れる。   ADVANTAGE OF THE INVENTION According to this invention, the malfunctioning of clogging detection of a dustproof filter can be reduced. In addition, since the temperature detection circuit for detecting the internal temperature in the ventilation duct can be integrated into one, the cost can be reduced.

以下に、本発明の実施の形態を説明する。   Hereinafter, embodiments of the present invention will be described.

図１，図２，図３を用いて、実施例１の防塵フィルタの目詰まり検出装置について説明する。図１は、実施例１による防塵フィルタの目詰まり検出装置を示す模式図、図２は実施例１における検出温度と目詰まり率の関係を説明する図、図３は実施例１による目詰まり検出処理の一フローチャートである。   A clogging detection device for a dustproof filter according to a first embodiment will be described with reference to FIGS. FIG. 1 is a schematic diagram illustrating a clogging detection device for a dustproof filter according to a first embodiment, FIG. 2 is a diagram illustrating a relationship between a detection temperature and a clogging rate in the first embodiment, and FIG. It is a flowchart of a process.

以下では、発熱体を有する装置を液晶プロジェクタとし、説明を容易とするために、便宜上、発熱体を２つのグループに分類するものとする（但し、実施例１はこれに限定されるものではなく、複数のグループを有するものであってもよい。）。一方は許容温度の高い発熱体のグループで、例えばＰＢＳなどであり、他方は許容温度の低い発熱体のグループで、例えば表示素子，偏光板などである。   In the following description, a device having a heating element is assumed to be a liquid crystal projector, and the heating elements are classified into two groups for the sake of convenience for ease of explanation (however, the first embodiment is not limited to this). And may have a plurality of groups). One is a group of heating elements having a high allowable temperature, such as PBS, and the other is a group of heating elements having a low allowable temperature, such as a display element and a polarizing plate.

図１において、許容温度の高い第１の発熱体２１は例えばＰＢＳである。ここでは、許容温度の高い発熱体として第１の発熱体２１のみで示しているが、複数あってもよいことはいうまでもない。許容温度が低い第２の発熱体３１は、例えば表示素子である。光源からの光を表示素子に照射し、表示素子からの光を投射レンズで投射する液晶プロジェクタでは、許容温度の低いものとして、例えばＲ光，Ｇ光，Ｂ光用の３枚の表示素子があり、また他に、偏光板などがある。ここでは、複数の発熱体があるとして、第Ｎの発熱体を符号３３で示し、他のものの図示を省略する。   In FIG. 1, the 1st heat generating body 21 with high allowable temperature is PBS, for example. Here, only the first heating element 21 is shown as a heating element with a high allowable temperature, but it goes without saying that there may be a plurality of heating elements. The second heating element 31 having a low allowable temperature is, for example, a display element. In a liquid crystal projector that irradiates a display element with light from a light source and projects light from the display element with a projection lens, three display elements for R light, G light, and B light, for example, have low allowable temperatures. There are other polarizing plates. Here, assuming that there are a plurality of heating elements, the Nth heating element is denoted by reference numeral 33 and the other elements are not shown.

ファン２２１は冷却能力が低く、防塵フィルタ１００から吸入した風で第１の発熱体２１を冷却し、ファン３３１は冷却能力が高く、防塵フィルタ１００から吸入した風で第２の発熱体３１を冷却し、ファン３３３は冷却能力が高く、第Ｎの発熱体を冷却する。各ファンは、１個の発熱体を冷却するように図示されているが、これに限定されるものではなく、１つのファンで複数の発熱体を冷却するようにしてもよい。   The fan 221 has a low cooling capacity and cools the first heating element 21 with the wind sucked from the dustproof filter 100, and the fan 331 has a high cooling capacity and cools the second heating element 31 with the wind sucked from the dustproof filter 100. The fan 333 has a high cooling capacity and cools the Nth heating element. Although each fan is illustrated as cooling one heating element, the present invention is not limited to this, and a plurality of heating elements may be cooled by one fan.

実施例１による防塵フィルタ１００は、許容温度の高い発熱体を冷却する防塵フィルタと、許容温度の低い発熱体を冷却する風路に設けてある防塵フィルタとが共通であって、装置の筐体の上面、下面、側面の何れか一面に形成されている。   In the dustproof filter 100 according to the first embodiment, a dustproof filter that cools a heating element having a high allowable temperature and a dustproof filter provided in an air passage that cools a heating element having a low allowable temperature are common, and the housing of the apparatus Is formed on one of the upper surface, the lower surface, and the side surface.

また、実施例１による通気ダクト２００は、防塵フィルタ１００側は分割されてないが、所定の場所から許容温度の高い発熱体を冷却する風路を形成する通気ダクト２００ａと許容温度の低い発熱体を冷却する風路を形成する通気ダクト２００ｂとに分割する分割部２０１とで形成されている。そして、通気ダクト２００ａ側に第１の発熱体２１，ファン２２１が設けられ、通気ダクト２００ｂ側に第２の発熱体３１，ファン３３１、…、第Ｎの発熱体３３，ファン３３３が設けられている。   Further, the ventilation duct 200 according to the first embodiment is not divided on the dustproof filter 100 side, but the ventilation duct 200a that forms an air passage for cooling the heating element having a high allowable temperature from a predetermined place and the heating element having a low allowable temperature. It is formed by a dividing portion 201 that divides the air duct 200b that forms an air passage for cooling the air. The first heating element 21 and the fan 221 are provided on the ventilation duct 200a side, and the second heating element 31, the fan 331,..., The Nth heating element 33 and the fan 333 are provided on the ventilation duct 200b side. Yes.

制御回路６は、例えば演算制御機能を有するＣＰＵ（Central Processing Unit）を含み、図示しないＲＯＭに格納されたプログラムに基づいて、図示しないワークメモリを適宜用いながら装置全体の制御を行うとともに、例えば後述する防塵フィルタの目詰まり検出処理を行う。   The control circuit 6 includes, for example, a CPU (Central Processing Unit) having a calculation control function, and controls the entire apparatus based on a program stored in a ROM (not shown) while appropriately using a work memory (not shown). The clogging detection process of the dustproof filter is performed.

液晶プロジェクタの冷却装置は、以上述べたように形成されている。そこで、防塵フィルタ１００が目詰まりしてない場合には、空気は防塵フィルタ１００から取り込まれ、通気ダクト２００内のそれぞれの通気ダクト２００ａ，２００ｂを矢印８０１，８０２，８０３のように流れる。しかし、防塵フィルタ１００が目詰まりしてくると、ファンの冷却能力の差により、静圧の小さいファン側から静圧の大きいファン側に向かう空気流が生じてしまう。実施例１では、ファン２２１は冷却能力が小さいので静圧・風量が小さく、これに対してファン３３１，３３３は冷却能力が大きいので静圧・風量が大きい。従って、矢印８１０の向きに空気流が生じる。第１の発熱体２１は、発熱温度が高い。防塵フィルタ１００の目詰まりが生じると、矢印８１０の向きに空気流が生じるので、第１の発熱体２１によって温度が上昇した温風が通気ダクト２００ａを通って、通気ダクト２００ｂ側に逆流する。   The cooling device for the liquid crystal projector is formed as described above. Therefore, when the dustproof filter 100 is not clogged, air is taken in from the dustproof filter 100 and flows through the ventilation ducts 200a and 200b in the ventilation duct 200 as indicated by arrows 801, 802, and 803. However, when the dust filter 100 becomes clogged, an air flow from the fan side having a low static pressure toward the fan side having a high static pressure is generated due to a difference in cooling capacity of the fans. In the first embodiment, since the fan 221 has a small cooling capacity, the static pressure and the air volume are small. On the other hand, since the fans 331 and 333 have a large cooling capacity, the static pressure and the air volume are large. Accordingly, an air flow is generated in the direction of the arrow 810. The first heating element 21 has a high heat generation temperature. When the dust filter 100 is clogged, an air flow is generated in the direction of the arrow 810, so that the warm air whose temperature has been raised by the first heating element 21 flows backward through the ventilation duct 200a to the ventilation duct 200b side.

そこで、実施例１では、通気ダクト２００ａ内のみに温度検出用の第２の温度検出回路４を設けるようにした。防塵フィルタ１００の目詰まりで逆流が生じと、第１の発熱体により温度が上昇した温風が通気ダクト２００ａ内を逆流するので、急激に第２の温度検出回路４で検出される温度が上昇する。   Therefore, in the first embodiment, the second temperature detection circuit 4 for temperature detection is provided only in the ventilation duct 200a. When a reverse flow occurs due to the clogging of the dustproof filter 100, the warm air whose temperature has been raised by the first heating element flows backward in the ventilation duct 200a, so that the temperature detected by the second temperature detection circuit 4 suddenly increases. To do.

図２は、検出温度と目詰まり率の関係を示す図である。Ｔ１０１は第１の温度検出回路３にて検出した外気温度で、Ｔ１０２は第２の温度検出回路４にて検出した通気ダクト２００ａの内部温度である。ΔＴは目詰まりしてないときの内部温度Ｔ１０２と外気温度Ｔ１０１の差温度である。ΔＴ１０３は（Ｔ１０２−Ｔ１０１−ΔＴ）の式であらわされる差温度で、目詰まりによる温度変化を示すものである。ΔＴ１０４は目詰まり検出と判定する所定の閾値を示す。実施例１では、その閾値レベルには後述する、異なるレベルαとレベルβとがある。尚、以下では、差温度はΔＴ１０３を指すものとする。   FIG. 2 is a diagram illustrating the relationship between the detected temperature and the clogging rate. T101 is the outside air temperature detected by the first temperature detection circuit 3, and T102 is the internal temperature of the ventilation duct 200a detected by the second temperature detection circuit 4. ΔT is a difference temperature between the internal temperature T102 and the outside air temperature T101 when not clogged. ΔT103 is a difference temperature represented by the equation (T102−T101−ΔT), and indicates a temperature change due to clogging. ΔT104 indicates a predetermined threshold value for determining clogging detection. In the first embodiment, the threshold level includes different levels α and β, which will be described later. In the following description, the difference temperature indicates ΔT103.

図２から明らかなように、防塵フィルタの目詰まりが生じると、差温度ΔＴ１０３は、通気ダクト２００ａと２００ｂを分離し、２つのダクトにして温度検出した場合に対して、温度変化が十分大きくなる。これにともない、防塵フィルタの目詰まりを検出する所定の閾値であるΔＴ１０４を大きくすることができる。これによって、温度検出回路が多少の検出温度のばらつき（通常２〜３℃）を有していても、目詰まり検出に対する影響が相対的に小さくなるので、良好に防塵フィルタの目詰まりを検出することが可能となる。なお、目詰まりの早期発見および温度差を大きくする為に、第２の温度検出回路４は通気ダクト２００ａ内でファン２２１に近い位置に設けるのが好ましい。   As is apparent from FIG. 2, when the dust filter is clogged, the difference in temperature ΔT103 has a sufficiently large temperature change compared to the case where the temperature is detected by separating the ventilation ducts 200a and 200b into two ducts. . Along with this, ΔT104, which is a predetermined threshold for detecting clogging of the dustproof filter, can be increased. As a result, even if the temperature detection circuit has some variation in detection temperature (usually 2 to 3 ° C.), the influence on the clogging detection is relatively reduced, so that the clogging of the dustproof filter can be detected well. It becomes possible. In order to detect clogging early and increase the temperature difference, the second temperature detection circuit 4 is preferably provided at a position close to the fan 221 in the ventilation duct 200a.

また、この際、通気ダクト２００内の内部温度測定に一つの温度検出回路４のみを使用するため、従来に比べて、低コスト化を図ることもできる。   At this time, since only one temperature detection circuit 4 is used for measuring the internal temperature in the ventilation duct 200, the cost can be reduced as compared with the conventional case.

次に、図３を用いて、実施例１による制御回路６の制御処理について説明する。制御回路６は、防塵フィルタの目詰まり検出処理を所定の時間間隔で定期的に行う。目詰まり検出処理を開始すると、まずステップ１（以下、ステップを「Ｓ」とする）で、第１の温度検出回路３と第２の温度検出回路４を用いて外気温度Ｔ１０１と内部温度Ｔ１０２を検出する。次に、内部温度Ｔ１０２と外気温度Ｔ１０１の差温度ΔＴ１０３を算出する（Ｓ２）。そして、Ｓ３で、差温度ΔＴ１０３が目詰まり検出の警告表示を行う所定の閾値αを超えたか判定する。Ｓ３でＮＯであれば目詰まり検出処理を終了し、ＹＥＳであればＳ４に進む。   Next, a control process of the control circuit 6 according to the first embodiment will be described with reference to FIG. The control circuit 6 periodically performs the clogging detection process of the dustproof filter at predetermined time intervals. When the clogging detection process is started, first, in step 1 (hereinafter, “S”), the outside temperature T101 and the inside temperature T102 are set using the first temperature detection circuit 3 and the second temperature detection circuit 4. To detect. Next, a difference temperature ΔT103 between the internal temperature T102 and the outside air temperature T101 is calculated (S2). Then, in S3, it is determined whether or not the difference temperature ΔT103 has exceeded a predetermined threshold value α at which a clogging detection warning is displayed. If NO in S3, the clogging detection process is terminated, and if YES, the process proceeds to S4.

Ｓ４では、差温度ΔＴ１０３が目詰まり検出であるエラー表示を行う所定の閾値βを超えたか判定する。Ｓ４でＮＯであれば（すなわち差温度ΔＴ１０３が閾値β以下であれば）Ｓ５に進み、制御回路６は防塵フィルタの交換時期であることを表示するとともに、許容温度が低い第２の発熱体３１，…，第Ｎの発熱体３３の信頼性が低下することを通知する警告表示を表示デバイス７で行う。そして処理を終了する。   In S4, it is determined whether or not the difference temperature ΔT103 exceeds a predetermined threshold value β for displaying an error indicating clogging detection. If NO in S4 (that is, if the difference temperature ΔT103 is equal to or less than the threshold value β), the process proceeds to S5, and the control circuit 6 displays that it is time to replace the dust filter, and the second heating element 31 having a low allowable temperature is displayed. ,..., A warning display for notifying that the reliability of the Nth heating element 33 is lowered is performed on the display device 7. Then, the process ends.

Ｓ４でＹＥＳであれば（すなわち差温度ΔＴ１０３が閾値β以上であれば）Ｓ６に進み、制御回路６は防塵フィルタの目詰まりが生じたものとして、発熱体の寿命（特に許容温度が低い第２の発熱体３１，…，第Ｎの発熱体３３の寿命）の観点から、発熱体に熱エネルギーを供給する供給源の電源をオフする（但し、この際、ファンは発熱体の温度を低下させるために、所定時間の間動作させることはいうまでもない）。例えば装置が液晶プロジェクタの場合は、光学部品は光源からの光を受けて発熱するので、光源の発光を停止する。また、例えば装置が半導体装置であれば、発熱体の電源をオフする。そして、次にＳ７で防塵フィルタの目詰まりが生じたことをユーザに通知するため、表示デバイス７で目詰まり状態表示を行い、処理を終了する。   If YES in S4 (that is, if the difference temperature ΔT103 is equal to or greater than the threshold value β), the process proceeds to S6, and the control circuit 6 assumes that the dustproof filter has been clogged, and the life of the heating element (particularly the second having a low allowable temperature). From the viewpoint of the life of the heating elements 31,..., The life of the Nth heating element 33), the power source for supplying heat energy to the heating elements is turned off (however, the fan lowers the temperature of the heating elements at this time). Therefore, it goes without saying that it is operated for a predetermined time). For example, when the apparatus is a liquid crystal projector, the optical component generates heat upon receiving light from the light source, and thus stops the light emission of the light source. For example, if the device is a semiconductor device, the power source of the heating element is turned off. Then, in order to notify the user that the dustproof filter is clogged in S7, the clogging state is displayed on the display device 7, and the process is terminated.

図４は、温度検出回路の一実施例である。図４では、温度検出回路の代表として第１の温度検出回路３を示している。他の温度検出回路も同様に形成されていることはいうまでもない。実施例１では、温度センサーとしてサーミスタ３０３を用いている。サーミスタ３０３にＤＣ電源３０１から抵抗Ｒ１を介して電流を流し、サーミスタ３０３の両端間の電圧（アナログ電圧）をＡＤコンバータ３０４でデジタルデータに変換する。そして、制御回路６であるＣＰＵ６０１はＡＤコンバータ３０４からのデジタルデータを読み取り、温度を検出し、他の温度検出回路の温度検出値と合せて、これらの温度検出値に基づき、図３に示した目詰まり検出処理を行う。   FIG. 4 shows an embodiment of the temperature detection circuit. FIG. 4 shows the first temperature detection circuit 3 as a representative of the temperature detection circuit. It goes without saying that other temperature detection circuits are formed in the same manner. In the first embodiment, the thermistor 303 is used as the temperature sensor. A current is passed through the thermistor 303 from the DC power supply 301 via the resistor R1, and the voltage (analog voltage) across the thermistor 303 is converted into digital data by the AD converter 304. Then, the CPU 601 serving as the control circuit 6 reads the digital data from the AD converter 304, detects the temperature, and combines with the temperature detection values of the other temperature detection circuits, based on these temperature detection values, as shown in FIG. Perform clogging detection processing.

図５は、表示デバイスの一実施例である。図５において、実施例１の表示デバイス７は、警告表示を行うＬＥＤ１と目詰まり状態表示を行うＬＥＤ２とを含む。制御回路６は差温度ΔＴ１０３が所定の閾値α以上でβ以下であることを検出すると、トランジスタＴＲ１のベース（Ａ点）に１．４Ｖ以上の電圧を出力する。これによりトランジスタＴＲ１がオンし、ＤＣ電源７０１から抵抗Ｒ２を介してＬＥＤ１に電流が流れ、ＬＥＤ１が発光し、警告表示がなされる。また、制御回路６は差温度ΔＴ１０３が所定の閾値β以上であることを検出すると、トランジスタＴＲ２のベース（Ｂ点）に１．４Ｖ以上の電圧を出力する。これによりトランジスタＴＲ２がオンし、ＤＣ電源７０１から抵抗Ｒ３介してＬＥＤ２に電流が流れ、ＬＥＤ２が発光し、目詰まり状態表示がなされる。   FIG. 5 is an example of a display device. In FIG. 5, the display device 7 according to the first embodiment includes an LED 1 that displays a warning and an LED 2 that displays a clogging state. When the control circuit 6 detects that the difference temperature ΔT103 is not less than a predetermined threshold value α and not more than β, it outputs a voltage of 1.4 V or more to the base (point A) of the transistor TR1. As a result, the transistor TR1 is turned on, a current flows from the DC power source 701 to the LED 1 via the resistor R2, the LED 1 emits light, and a warning is displayed. Further, when the control circuit 6 detects that the difference temperature ΔT103 is equal to or higher than the predetermined threshold value β, it outputs a voltage of 1.4 V or higher to the base (point B) of the transistor TR2. Thereby, the transistor TR2 is turned on, a current flows from the DC power source 701 to the LED 2 via the resistor R3, the LED 2 emits light, and a clogging state display is made.

図６を用いて、実施例２の防塵フィルタの目詰まり検出装置について説明する。図６において、５は、ダクト２００ａを通過する風量を検出する風量検出センサである。図６において、実施例１と同様の符号及び機能の説明は省略する。   With reference to FIG. 6, the clogging detection device for a dustproof filter of Example 2 will be described. In FIG. 6, 5 is an air volume detection sensor for detecting the air volume passing through the duct 200a. In FIG. 6, the description of the same symbols and functions as those in the first embodiment is omitted.

実施例２では、実施例１と同様に、防塵フィルタ１００が目詰まりしてくると、ファンの冷却能力の差により、静圧の小さいファン側から静圧の大きいファン側に向かう空気流（矢印８１０）が生じる。そこで、予め、風量検出センサ５により、通常使用しているときと目詰まりしているときの差風量を検出し、目詰まり検出と判定する閾値を設定することにより、防塵フィルタ１００の目詰まりを検出する。   In the second embodiment, as in the first embodiment, when the dustproof filter 100 becomes clogged, the air flow (arrow) from the fan side having a small static pressure toward the fan side having a large static pressure is caused by the difference in cooling capacity of the fan. 810) occurs. Therefore, the airflow detection sensor 5 detects in advance the difference in airflow between normal use and clogging, and sets a threshold value for determining clogging detection, thereby clogging the dustproof filter 100. To detect.

実施例２によれば、実施例１と同様の効果を得ることができる。また、実施例２では、風量検出センサ５をダクト２００ａ内に配置しているが、ダクト２００ｂ内に配置し、ダクト２００ｂを通過する風量を検出しても同様の効果を得ることは言うまでもない。さらに、防塵フィルタ１００が目詰まり状態になった場合には、ファン２２１に向かう風の所定量がファン３３１に向かうため、即ち、分割部２０１の近傍に、風量検出センサ５を配置しても同様の効果を得ることは言うまでもない。   According to the second embodiment, the same effect as the first embodiment can be obtained. In the second embodiment, the air volume detection sensor 5 is arranged in the duct 200a. However, it goes without saying that the same effect can be obtained by arranging the air volume sensor 5 in the duct 200b and detecting the air volume passing through the duct 200b. Further, when the dustproof filter 100 is clogged, the predetermined amount of wind toward the fan 221 is directed to the fan 331, that is, even if the air volume detection sensor 5 is disposed in the vicinity of the dividing unit 201. Needless to say, the effect of.

実施例１による防塵フィルタの目詰まり検出装置を示す模式図。FIG. 3 is a schematic diagram illustrating a clogging detection device for a dustproof filter according to a first embodiment. 実施例１における検出温度と目詰まり率の関係を説明する図。FIG. 3 is a diagram for explaining a relationship between a detected temperature and a clogging rate in the first embodiment. 実施例１による目詰まり検出処理の一フローチャート。6 is a flowchart of clogging detection processing according to the first embodiment. 温度検出回路の一実施例。An example of a temperature detection circuit. 表示デバイスの一実施例。An example of a display device. 実施例２による防塵フィルタの目詰まり検出装置を示す模式図。FIG. 6 is a schematic diagram illustrating a clogging detection device for a dustproof filter according to a second embodiment.

符号の説明Explanation of symbols

３…第１の温度検出回路、４…第２の温度検出回路、５…風量検出センサ、６…制御回路、７…表示デバイス、２１…第１の発熱体、３１…第２の発熱体、３３…第Ｎの発熱体、１００…防塵フィルタ、２００…通気ダクト、２０１…分割部、２２１…ファン、３０１…ＤＣ電源、３０３…サーミスタ、３０４…ＡＤコンバータ、３３１，３３３…ファン、６０１…ＣＰＵ、７０１…ＤＣ電源、８０１，８０２，８０３，８１０…矢印。
DESCRIPTION OF SYMBOLS 3 ... 1st temperature detection circuit, 4 ... 2nd temperature detection circuit, 5 ... Air volume detection sensor, 6 ... Control circuit, 7 ... Display device, 21 ... 1st heating element, 31 ... 2nd heating element, 33 ... Nth heating element, 100 ... dust filter, 200 ... ventilation duct, 201 ... dividing part, 221 ... fan, 301 ... DC power supply, 303 ... thermistor, 304 ... AD converter, 331,333 ... fan, 601 ... CPU 701 DC power source 801 802 803 810 arrow.

Claims (10)

筐体の上面、下面、側面の何れか一面に設けられた防塵フィルタの目詰まりを検出する検出装置であって、
少なくとも第１及び第２の発熱体と、
前記防塵フィルタから風を吸入して前記第１の発熱体を冷却する第１のファンと、
前記防塵フィルタから風を吸入して前記第２の発熱体を冷却し、前記第１のファンと回転数が異なる第２のファンと、
前記防塵フィルタからの風を、所定の場所から、前記第１のファンに導く部分と前記第２のファンに導く部分とに分割する分割部を有するダクトと、
前記装置外の温度を検出し、前記装置外に配置された第１の温度検出部と、
前記装置内の温度を検出し、前記装置内に配置された第２の温度検出部と、
前記第１の温度検出部で検出された温度と、前記第２の温度検出部で検出された温度との差温度を検出し、前記差温度が所定の閾値の範囲内にあるか否かを判定する制御部とを有することを特徴とする検出装置。 A detection device that detects clogging of a dustproof filter provided on any one of an upper surface, a lower surface, and a side surface of a housing,
At least first and second heating elements;
A first fan that sucks wind from the dust filter and cools the first heating element;
A second fan having a rotational speed different from that of the first fan, by sucking air from the dust filter to cool the second heating element;
A duct having a dividing portion that divides the wind from the dustproof filter from a predetermined location into a portion leading to the first fan and a portion leading to the second fan;
Detecting a temperature outside the device, and a first temperature detector disposed outside the device;
Detecting a temperature in the device; and a second temperature detecting unit disposed in the device;
A difference temperature between the temperature detected by the first temperature detection unit and the temperature detected by the second temperature detection unit is detected, and whether or not the difference temperature is within a predetermined threshold range. And a control unit for determining. 請求項１記載の検出装置であって、
前記第２の温度検出部は、前記第１及び第２のファンのうち、前記回転数が少ないファンの近傍に配置されることを特徴とする検出装置。 The detection device according to claim 1,
The detection device, wherein the second temperature detection unit is arranged in the vicinity of the fan having a small number of rotations among the first and second fans. 請求項１又は２記載の検出装置であって、
前記検出装置は、
前記制御部が前記差温度は所定の閾値の範囲にあると判定した場合には、前記判定を表示する表示デバイスを有すること特徴とする検出装置。 The detection device according to claim 1 or 2,
The detection device includes:
A detection apparatus comprising: a display device that displays the determination when the control unit determines that the difference temperature is within a predetermined threshold range. 請求項１から３記載の検出装置であって、
前記検出装置は、
少なくとも、前記第１のファンに電流を供給する電源部を有し、
前記制御部が前記差温度は所定の閾値の範囲にあると判定した場合には、前記電源部は、前記電流を供給する量を異ならせることを特徴とする検出装置。 The detection device according to claim 1, wherein
The detection device includes:
At least a power supply for supplying current to the first fan;
When the control unit determines that the difference temperature is within a predetermined threshold range, the power supply unit varies the amount of supplying the current. 筐体の上面、下面、側面の何れか一面に設けられた防塵フィルタの目詰まりを検出する検出装置であって、
少なくとも第１及び第２の発熱体と、
前記防塵フィルタから風を吸入して前記第１の発熱体を冷却する第１のファンと、
前記防塵フィルタから風を吸入して前記第２の発熱体を冷却し、前記第１のファンと回転数が異なる第２のファンと、
前記防塵フィルタからの風を、所定の場所から、前記第１のファンに導く部分と前記第２のファンに導く部分とに分割する分割部を有するダクトと、
前記装置内に配置された風量検出センサと、
前記風量検出センサにより検出された前記差風量が所定の閾値の範囲内にあるか否かを判定する制御部とを有することを特徴とする検出装置。 A detection device that detects clogging of a dustproof filter provided on any one of an upper surface, a lower surface, and a side surface of a housing,
At least first and second heating elements;
A first fan that sucks wind from the dust filter and cools the first heating element;
A second fan having a rotational speed different from that of the first fan, by sucking air from the dust filter to cool the second heating element;
A duct having a dividing portion that divides the wind from the dustproof filter from a predetermined location into a portion leading to the first fan and a portion leading to the second fan;
An air volume detection sensor disposed in the apparatus;
And a control unit that determines whether or not the differential airflow detected by the airflow detection sensor is within a predetermined threshold range. 請求項５記載の検出装置であって、
前記風量検出センサは、前記第１又は第２のファンの近傍に配置されることを特徴とする検出装置。 The detection device according to claim 5,
The air volume detection sensor is arranged in the vicinity of the first or second fan. 請求項５記載の検出装置であって、
前記風量検出センサは、前記分割部の近傍に配置されることを特徴とする検出装置。 The detection device according to claim 5,
The said air volume detection sensor is arrange | positioned in the vicinity of the said division part, The detection apparatus characterized by the above-mentioned. 請求項５から７記載の検出装置であって、
前記検出装置は、
前記制御部が前記差風量は所定の閾値の範囲にあると判定した場合には、前記判定を表示する表示デバイスを有すること特徴とする検出装置。 The detection device according to claim 5, wherein
The detection device includes:
A detection apparatus comprising: a display device for displaying the determination when the control unit determines that the differential airflow volume is within a predetermined threshold range. 請求項５から８記載の検出装置であって、
前記検出装置は、
少なくとも、前記第１のファンに電流を供給する電源部を有し、
前記制御部が前記差風量は所定の閾値の範囲にあると判定した場合には、前記電源部は、前記電流を供給する量を異ならせることを特徴とする検出装置。 The detection device according to claim 5, wherein
The detection device includes:
At least a power supply for supplying current to the first fan;
When the control unit determines that the differential airflow volume is within a predetermined threshold range, the power supply unit varies the amount of supplying the current. 光源からの光を表示素子に照射し、前記表示素子からの光を投射レンズで投射する表示装置であって、
少なくとも、請求項１から９記載の検出装置を有することを特徴とする表示装置。
A display device that irradiates a display element with light from a light source, and projects light from the display element with a projection lens,
A display device comprising at least the detection device according to claim 1.
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CN103875071B (en) * 2011-09-27 2015-08-05 丰田自动车株式会社 The abnormal detector of cooling device and method for detecting abnormality
JP2017201357A (en) * 2016-05-02 2017-11-09 株式会社リコー Airflow detection duct device and image forming apparatus
CN106989489A (en) * 2017-04-19 2017-07-28 珠海格力电器股份有限公司 Replacement reminding method and device for air conditioner filtering device and air conditioner
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