JPH06296568A - Sucking device of electric vacuum cleaner - Google Patents
Sucking device of electric vacuum cleanerInfo
- Publication number
- JPH06296568A JPH06296568A JP8837893A JP8837893A JPH06296568A JP H06296568 A JPH06296568 A JP H06296568A JP 8837893 A JP8837893 A JP 8837893A JP 8837893 A JP8837893 A JP 8837893A JP H06296568 A JPH06296568 A JP H06296568A
- Authority
- JP
- Japan
- Prior art keywords
- electric motor
- motor
- thermistor
- temperature coefficient
- positive temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Electric Suction Cleaners (AREA)
- Nozzles For Electric Vacuum Cleaners (AREA)
- Thermistors And Varistors (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、吸込具本体内に回転自
在に回転ブラシを設けると共に、該回転ブラシを伝達機
構を介して回転駆動させる電動機を設け、該電動機に過
負荷が加わった時に当該電動機を保護する正特性サーミ
スタを設けた電気掃除機の吸込具に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a rotating brush rotatably in a main body of a suction tool and an electric motor for driving the rotating brush to rotate via a transmission mechanism, and when an overload is applied to the electric motor. The present invention relates to a suction tool of an electric vacuum cleaner provided with a positive temperature coefficient thermistor for protecting the electric motor.
【０００２】[0002]
【従来の技術】従来の電気掃除機の吸込具４６を図７及
び図８に示すように、吸込具本体４７内に電動機４８を
設けるとともに、床面に対向する吸込開口４９を設けた
回転ブラシ室５０を形成し、この回転ブラシ室５０に回
転ブラシ５１を配置し、電動機４８と上記回転ブラシ５
１の一端部のみに設けた歯車のような被伝達部５２とを
伝達手段であるベルト５３で連動し、電動機４８の回転
力によって上記回転ブラシ５１を回転させ、絨毯等の床
面の塵埃をかき上げて吸い込む構造で、特に回転ブラシ
５１に大きな負荷がかかったり、電動機４８がロックし
た場合に過大電流が流れて電動機４８が破損するのを防
止するために正特性サーミスタ５４が設けられていた。
なお、５５は電圧降下用抵抗である。2. Description of the Related Art As shown in FIGS. 7 and 8, a suction tool 46 of a conventional electric vacuum cleaner is provided with a motor 48 in a suction tool body 47 and a rotary brush having a suction opening 49 facing the floor surface. A chamber 50 is formed, a rotary brush 51 is arranged in the rotary brush chamber 50, and the electric motor 48 and the rotary brush 5 are formed.
The transmission portion 52 such as a gear provided only at one end of the first gear 1 is interlocked by a belt 53 as a transmission means, and the rotating brush 51 is rotated by the rotating force of the electric motor 48 to remove dust on the floor surface of a carpet or the like. The positive characteristic thermistor 54 is provided in order to prevent the electric motor 48 from being damaged by a large load applied to the rotating brush 51 or an excessive current flowing when the electric motor 48 is locked. .
Reference numeral 55 is a voltage drop resistor.
【０００３】しかし、正特性サーミスタは一般的に製法
上の問題から使用者が必要とする抵抗値Ｒに対し量産性
を考慮すると抵抗値Ｒ±２０％程度の精度のものしか得
られなかったのが現実である。従って、正特性サーミス
タを電動機４８の保護に使用する場合、通常の掃除のと
きの電動機４８の負荷電流では動作せず、回転ブラシ５
１のロック時のような過大電流時にのみ動作するよう抵
抗値Ｒを設定することが設計上必要になっている。However, in general, the PTC thermistor can only obtain a resistance value R of about ± 20% with respect to the resistance value R required by the user in view of mass production because of a problem in the manufacturing method. Is the reality. Therefore, when the positive temperature coefficient thermistor is used to protect the electric motor 48, it does not operate with the load current of the electric motor 48 during normal cleaning, and the rotating brush 5
It is necessary in design to set the resistance value R so that it operates only when an excessive current is present, such as when 1 is locked.
【０００４】正特性サーミスタはその抵抗に流れる電流
により発熱したり外部環境によりその表面温度が決めら
れたキューリーポイントに達すると加速度的に抵抗値が
上昇し電流をカットするようになっている。The positive temperature coefficient thermistor is designed to heat up due to the current flowing through its resistance, or when the surface temperature reaches a predetermined Curie point due to the external environment, the resistance value is accelerated and the current is cut off.
【０００５】その為、通常使用においては、正特性サー
ミスタが動作しやすい虞れがある抵抗値Ｒの上限Ｒ＋２
０％にては動作しないように使用し、ロック等の異常時
には抵抗値Ｒの下限Ｒ−２０％にて正特性サーミスタが
動作するように回転ブラシ５１と床面との隙間設定や、
ブラシの材質，硬度設定等に制約があった。Therefore, in normal use, there is a possibility that the positive temperature coefficient thermistor is likely to operate.
It is used so that it does not operate at 0%, and when there is an abnormality such as a lock, the clearance between the rotary brush 51 and the floor is set so that the positive temperature coefficient thermistor operates at the lower limit R-20% of the resistance value R,
There were restrictions on the brush material and hardness settings.
【０００６】ところが、このような床面との隙間やブラ
シの材質，硬度等は、床面からのゴミの除去に密接に関
係しており、ゴミを床面からかき上げる性能を上げるに
は、床面とブラシとの接触が大きく必要であり、従って
負荷電流も大きくならざるを得ない状況になっている。However, such a gap with the floor surface, the material and hardness of the brush, etc. are closely related to the removal of dust from the floor surface, and in order to improve the performance of scraping dust from the floor surface, It is necessary to make a large contact between the floor and the brush, so the load current must be large.
【０００７】また、一方では吸込具の床面での操作性を
よくするため該吸込具の重量の大部分を占めている電動
機の小型軽量も必要になってきている。しかし、このよ
うな電動機の小型化は大型電動機に比べ駆動力不足にな
り通常使用時の負荷電流を増加させる結果になってい
る。On the other hand, in order to improve the operability of the suction tool on the floor surface, it is also necessary to reduce the size and weight of the electric motor, which accounts for most of the weight of the suction tool. However, such downsizing of the electric motor results in insufficient driving force as compared with the large electric motor, resulting in an increase in load current during normal use.
【０００８】従って、このような状況下において前述し
た正特性サーミスタに流れる電流は、従来は通常使用時
とロック時で大きな差があったため設計上大きな問題に
ならなかったが現在はその差が少なくなってきており、
そのため通常使用時においての電動機の早切れを防止す
るため正特性サーミスタを強制冷却する構造になってい
る。Therefore, in such a situation, the current flowing through the above-mentioned positive temperature coefficient thermistor did not cause a big problem in design because there was a large difference between the time of normal use and the time of locking in the past, but the difference is small at present. Is becoming
Therefore, the positive temperature coefficient thermistor is forcibly cooled in order to prevent the motor from prematurely shutting off during normal use.
【０００９】[0009]
【発明が解決しようとする課題】ところが、このような
強制冷却方式は掃除機本体の吸込力に依存しているた
め、使用者が手動で吸込力を変えた時や、ゴミが一杯た
まった時に冷却空気の不足により冷却不足となり、正特
性サーミスタが通常使用時に動作し、電動機が早切れす
る原因になっていた。However, since such a forced cooling system depends on the suction force of the cleaner body, when the user manually changes the suction force or when dust is full. The lack of cooling air resulted in insufficient cooling, and the PTC thermistor operated during normal use, causing the motor to turn off prematurely.
【００１０】また、このような早切れを防止するために
は正特性サーミスタを強く冷却すればよいが、そうする
とロック時の正特性サーミスタの動作が遅くなり電動機
の整流子面に過大電流が長時間流れることとなり（一般
的に吸込具に使用しているような電動機ではロック時間
が約２０秒を越えると整流子面が荒れる。）整流素子の
劣化が起こり寿命が短くなる欠点があった。Further, in order to prevent such premature disconnection, the positive temperature coefficient thermistor may be cooled strongly, but if this is done, the operation of the positive temperature coefficient thermistor will be delayed and excessive current will flow to the commutator surface of the motor for a long time. Therefore, there is a drawback in that the rectifying element deteriorates and the life is shortened due to flow (in a motor generally used for a suction tool, the commutator surface becomes rough when the lock time exceeds about 20 seconds).
【００１１】また、室温で冷却しているため冬場のよう
に冷却空気が冷たいと正特性サーミスタが発熱しにくく
なり、従ってロック時の動作が遅くなり電動機の劣化を
招く欠点を有していた。Further, since the cooling is performed at room temperature, if the cooling air is cold like in winter, the positive temperature coefficient thermistor is less likely to generate heat, so that the operation at the time of locking becomes slow and the motor is deteriorated.
【００１２】本考案はこれの欠点を解決し正特性サーミ
スタの設定を容易にするとともに、室温の変化に影響さ
れることなく電動機のロック時等に電動機へ過大電流が
流れるのを早期に防止することを目的とする。The present invention solves this drawback and facilitates setting of the positive temperature coefficient thermistor, and prevents an excessive current from flowing to the motor early when the motor is locked without being affected by changes in room temperature. The purpose is to
【００１３】[0013]
【課題を解決するための手段】本発明は上記問題を解消
するためのもので、吸込具本体内に回転自在に回転ブラ
シを設けると共に、該回転ブラシを伝達機構を介して回
転駆動させる電動機を設け、該電動機に過負荷が加わっ
た時に当該電動機を保護する正特性サーミスタを設け、
上記正特性サーミスタに直列若しくは並列に当該正特性
サーミスタの動作速度を速めるための抵抗を接続し、該
抵抗を上記正特性サーミスタの近傍に設けている。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides an electric motor in which a rotary brush is rotatably provided in a suction tool body and the rotary brush is rotationally driven via a transmission mechanism. And a positive temperature coefficient thermistor for protecting the electric motor when the electric motor is overloaded.
A resistor for increasing the operating speed of the PTC thermistor is connected in series or in parallel to the PTC thermistor, and the resistor is provided in the vicinity of the PTC thermistor.
【００１４】また、吸込具本体内に回転自在に回転ブラ
シを設けると共に、該回転ブラシを伝達機構を介して回
転駆動させる電動機を設け、該電動機に過負荷が加わっ
た時に当該電動機を保護する正特性サーミスタを設け、
上記正特性サーミスタを上記電動機の外表面に当接させ
て配設している。Further, a rotary brush is rotatably provided in the suction tool main body, and an electric motor for rotating the rotary brush via a transmission mechanism is provided to protect the electric motor when an overload is applied to the electric motor. A characteristic thermistor is installed,
The positive temperature coefficient thermistor is disposed in contact with the outer surface of the electric motor.
【００１５】[0015]
【作用】上記構成の吸込具であれば、掃除時の外部環境
の変化により室温が変化して正特性サーミスタの冷却空
気が大きく変化しても、抵抗の発熱した熱を正特性サー
ミスタへ与えているので、室温の変化により正特性サー
ミスタの動作速度が左右されることはなく、電動機のロ
ック時の過大電流を早期に防止して電動機の劣化を防止
する。With the suction device having the above structure, even if the room temperature changes due to the change of the external environment during cleaning and the cooling air of the PTC thermistor changes greatly, the heat generated by the resistance is applied to the PTC thermistor. Therefore, the operating speed of the positive temperature coefficient thermistor is not affected by the change in the room temperature, and the excessive current when the motor is locked is prevented early to prevent the deterioration of the motor.
【００１６】また、掃除時の外部環境の変化により室温
が変化して正特性サーミスタの冷却空気が大きく変化し
ても、電動機の熱を正特性サーミスタへ与えているの
で、室温の変化により正特性サーミスタの動作速度が左
右されることはなく、電動機のロック時の過大電流を早
期に防止して電動機の劣化を防止する。Even if the room temperature changes due to changes in the external environment during cleaning and the cooling air of the positive temperature coefficient thermistor changes significantly, the heat of the motor is applied to the positive temperature coefficient thermistor, so the positive temperature coefficient changes due to the change in room temperature. The operation speed of the thermistor is not affected, and excessive current when the motor is locked is prevented early to prevent deterioration of the motor.
【００１７】[0017]
【実施例】以下図面に示した本発明の実施例について詳
細に説明する。図１乃至図４は本発明の第１実施例を示
す図であり、吸込具本体１は上ケース５、下ケース６及
びカバー７により外郭を構成し、後端部に上下回動自在
な駆動パイプ８を備え、さらに該駆動パイプ８の先端に
回転自在な吸口パイプ９を連結する。Embodiments of the present invention shown in the drawings will be described in detail below. 1 to 4 are views showing a first embodiment of the present invention, in which a suction tool main body 1 constitutes an outer shell by an upper case 5, a lower case 6 and a cover 7, and has a rear end portion which is vertically rotatable. A pipe 8 is provided, and a rotatable suction pipe 9 is connected to the tip of the drive pipe 8.
【００１８】下ケース６は絨毯用のそりとして作用する
もので、その下面前部に横長の吸塵開口部１０を形成し
かつ該開口部１０の後方にてゴム製のシール材１１を横
方向に配設している。又、下ケース６は下面前部にて前
車輪１２を、後部にて後車輪１３を備え、この前車輪１
２と後車輪１３とによって下ケース６の下面と床面との
間に一定の間隙を生じるようになっている。The lower case 6 acts as a sled for a carpet, and has a horizontally long dust collecting opening 10 formed in the front portion of the lower surface thereof, and a rubber sealing material 11 is laterally provided behind the opening 10. It is arranged. The lower case 6 has front wheels 12 at the front part of the lower surface and rear wheels 13 at the rear part.
2 and the rear wheel 13 form a constant gap between the lower surface of the lower case 6 and the floor surface.
【００１９】吸込具本体１の内部には上ケース５と下ケ
ース６との結合により回転ブラシ室１４と該ブラシ室１
４を駆動パイプ８側に連通させる連絡路１５とを形成
し、この回転ブラシ室１４と連絡路１５により吸塵開口
部１０から駆動パイプ８，吸口パイル９に至る吸塵通路
を形成する。又、吸込具本体１の内側両側には機構室１
６，１７を形成し、かつこの内側で連絡路１５の両側に
は電動機室１８と制御回路基板収納室１９を形成してお
り、この各室１６乃至１９は上記吸塵通路に対し適宜区
画されている。Inside the suction tool body 1, the rotating brush chamber 14 and the brush chamber 1 are formed by coupling the upper case 5 and the lower case 6 together.
4 is formed to communicate with the drive pipe 8 side, and the rotary brush chamber 14 and the communication passage 15 form a dust suction passage from the dust suction opening 10 to the drive pipe 8 and the suction pile 9. In addition, the mechanism chambers 1 are provided on both inner sides of the suction tool body 1.
6, 17 are formed, and on the inner side thereof, a motor room 18 and a control circuit board housing room 19 are formed on both sides of the communication path 15. The respective rooms 16 to 19 are appropriately partitioned with respect to the dust collection path. There is.
【００２０】上ケース５の開口部２０は回転ブラシ室１
４に対面し回転ブラシ２にからみついた糸くず等を容易
に除去できるようにするためのもので、通常は着脱自在
なカバー７により閉塞している。バンパー２１は両ケー
ス５，６間に挾着され吸込具本体１の外周に位置するも
ので、両ケース５，６の結合面の密閉作用と障害物に対
する緩衝作用とをなすものである。The opening 20 of the upper case 5 is the rotary brush chamber 1
This is for facilitating the removal of lint and the like that face the rotating brush 2 and are entangled in the rotating brush 2, and are normally closed by a removable cover 7. The bumper 21 is sandwiched between the cases 5 and 6 and is located on the outer periphery of the suction tool body 1, and has a function of sealing the coupling surfaces of the cases 5 and 6 and a function of buffering obstacles.
【００２１】回転ブラシ２は外周面にアジテータ２２及
びブラシ毛２３を１条または複数条螺旋状に設けた構造
であり、回転ブラシ室１４内にあって両端の軸２４を機
械室１６、１７内に突出し該機械室１６，１７内で軸受
組品２５により回転自在に軸支されている。The rotary brush 2 has a structure in which an agitator 22 and brush bristles 23 are provided on the outer peripheral surface in a single or multiple spiral shape. The rotary brush chamber 14 has a shaft 24 at both ends in the machine chambers 16 and 17. And is rotatably supported by a bearing assembly 25 in the machine chambers 16 and 17.
【００２２】上記軸受組品２５は軸受２６、軸受ホルダ
ー２７よりなり、機械室１６，１７内において上下動自
在に保持されている。即ち、機械室１６，１７を構成す
る下ケース６側において対峙する一対のリブ２９，２９
を一体に形成し、この両リブ２９，２９間の溝３０内に
軸受組品２５を位置させて該軸受組品２５が溝３０に沿
って上下動できるようになっている。従って、このよう
な軸受組品２５に軸支される回転ブラシ２も上下動自在
に設けられることになり、該回転ブラシ２は通常自重及
びスプリング３１の作用により下方に付勢され最下位に
位置している。尚、回転ブラシ室１４と機械室１６、１
７間の区画壁には回転ブラシ２の端部が挿通しかつ該回
転ブラシ２の上下動を許す程度の開口部３２を設けてあ
る。The bearing assembly 25 comprises a bearing 26 and a bearing holder 27, and is held in the machine chambers 16 and 17 so as to be vertically movable. That is, a pair of ribs 29, 29 facing each other on the side of the lower case 6 forming the machine chambers 16, 17
Is integrally formed, and the bearing assembly 25 is positioned in the groove 30 between the ribs 29 so that the bearing assembly 25 can move up and down along the groove 30. Therefore, the rotary brush 2 pivotally supported by the bearing assembly 25 is also provided so as to be vertically movable, and the rotary brush 2 is normally urged downward by its own weight and the action of the spring 31 to be positioned at the lowest position. is doing. The rotating brush chamber 14 and the machine chambers 16 and 1
The partition wall between 7 is provided with an opening 32 through which the end of the rotary brush 2 is inserted and which allows the rotary brush 2 to move up and down.
【００２３】電動機３は直流マグネットモータであり、
電動機室１８内に設置され、その回転軸３３を機械室１
６内に突出し、該機械室１６内において、回転ブラシ２
の一方の軸２４との間に伝達機構４を介設する。この伝
達機構４は電動機３の回転軸３３に設けたプーリ３４、
回転ブラシ２の一方の軸２４に設けたギヤプーリ３５、
及び両プーリ３４，３５間に張設したタイミングベルト
３６よりなり、電動機３の回転を回転ブラシ２に伝達す
る。The electric motor 3 is a DC magnet motor,
It is installed in the electric motor room 18, and its rotating shaft 33 is installed in the machine room 1
6 and the rotating brush 2 in the machine room 16
The transmission mechanism 4 is provided between the shaft 24 and the one shaft 24. The transmission mechanism 4 includes a pulley 34 provided on a rotating shaft 33 of the electric motor 3,
A gear pulley 35 provided on one shaft 24 of the rotating brush 2,
And a timing belt 36 stretched between the pulleys 34 and 35, and transmits the rotation of the electric motor 3 to the rotating brush 2.
【００２４】また、電動機３の回転軸３３の先端にも軸
受組品３７が設けられて、下ケース６に一体形成された
リブ４３内に保持されている。この電動機３の回転方向
は、掃除をするときの進行方向に合わせて回転ブラシ２
が回転するようにプーリ３４側から見て反時計方向に設
定している。尚、電動機３は前・後部に通気口を有し、
この通気口を介して内部を空気が流通できる構造になっ
ている。A bearing assembly 37 is also provided at the tip of the rotary shaft 33 of the electric motor 3 and is held in a rib 43 formed integrally with the lower case 6. The rotating direction of the electric motor 3 is adjusted according to the traveling direction when cleaning the rotating brush 2.
Is set to rotate counterclockwise as viewed from the pulley 34 side. The electric motor 3 has ventilation holes at the front and rear,
It has a structure in which air can circulate inside through the vent holes.
【００２５】制御回路基板収納室１９は内部に正特性サ
ーミスタ３９及び該正特性サーミスタ３９の近傍に配設
された外部発熱抵抗３８を収めた制御回路４１を設ける
とともに該正特性サーミスタ３９を強制冷却するために
前・後部に通気口４４，４５を有し、この通気口４４，
４５を介して内部を空気が流通できる構造になってい
る。The control circuit board accommodating chamber 19 is provided therein with a control circuit 41 containing a positive temperature coefficient thermistor 39 and an external heat generating resistor 38 disposed in the vicinity of the positive temperature coefficient thermistor 39, and forcibly cooling the positive temperature coefficient thermistor 39. In order to do this, it has ventilation holes 44, 45 in the front and rear parts.
It has a structure in which air can flow through the interior of the chamber 45.
【００２６】上記電動機３は図４に示すように図示しな
い電気掃除機本体の給電コード（図示せず）を介して電
源に、正特性サーミスタ３９，１００Ｖを降下する電圧
降下用抵抗器４０の直列回路を介して接続されており、
該正特性サーミスタ３９に並列に外部発熱抵抗３８が接
続されている。図中、４２は電波障害防止用コンデン
サ、４３は電動機３に内蔵されている全波整流器であ
る。As shown in FIG. 4, the electric motor 3 is connected in series with a voltage drop resistor 40 for dropping the positive temperature coefficient thermistor 39, 100V to a power source via a power supply cord (not shown) of an electric vacuum cleaner body not shown. Connected through the circuit,
An external heating resistor 38 is connected in parallel with the positive temperature coefficient thermistor 39. In the figure, 42 is a capacitor for preventing radio interference, and 43 is a full-wave rectifier built in the electric motor 3.
【００２７】吸込具を使用する際には、この吸込具を図
示しない電気掃除機本体に連通するホース，延長管に接
続し、掃除機本体を運転する。電動機３は正特性サーミ
スタ３９，外部発熱抵抗３８，電圧降下用抵抗器４０を
介して給電され回転を行う。このようにして構成された
吸込具は通常使用時には掃除機本体の吸気により正特性
サーミスタ３９及び外部発熱抵抗３８を冷却しながら電
動機３を駆動している。尚、外部発熱抵抗３８は通常使
用時の電流による発熱では正特性サーミスタ３９を動作
させないようなワット数に設定してある。When the suction tool is used, the suction tool is connected to a hose and an extension pipe which communicate with a vacuum cleaner body (not shown), and the vacuum cleaner body is operated. The electric motor 3 is supplied with power via the positive temperature coefficient thermistor 39, the external heating resistor 38, and the voltage drop resistor 40 to rotate. In the normal use, the suction tool thus configured drives the electric motor 3 while cooling the positive temperature coefficient thermistor 39 and the external heating resistor 38 by the suction of the cleaner body. The external heating resistor 38 is set to have a wattage so that the positive temperature coefficient thermistor 39 is not operated by heat generated by current during normal use.
【００２８】このときに電動機３にロック等の過大電流
が流れると外部発熱抵抗３８にも過大電流が流れるた
め、該外部発熱抵抗３８が発熱し正特性サーミスタ３９
の表面温度を上昇させ、該正特性サーミスタ３９の過大
電流による温度上昇と相乗効果となり急速に正特性サー
ミスタ３９を高抵抗領域にもっていき電動機３の劣化を
防止する。At this time, if an excessive current such as a lock flows to the motor 3, an excessive current also flows to the external heating resistor 38, so that the external heating resistor 38 generates heat and the positive temperature coefficient thermistor 39.
The surface temperature of the positive temperature coefficient thermistor 39 is increased to have a synergistic effect with the temperature increase of the positive temperature coefficient thermistor 39 due to an excessive current, and the positive temperature coefficient thermistor 39 is rapidly brought to a high resistance region to prevent the deterioration of the motor 3.
【００２９】図５は本発明の第２実施例を示すものであ
り、上記第１実施例と同一部分の詳細な説明は省略し、
相違点のみを説明する。図５に示すように、第２実施例
においては正特性サーミスタ３９に直列に外部発熱抵抗
器３８を接続したものであり、第１実施例と同様に外部
発熱抵抗器３８は通常使用時の電流による発熱では正特
性サーミスタ３９を動作させないようなワット数に設定
してある。FIG. 5 shows a second embodiment of the present invention, and a detailed description of the same parts as those in the first embodiment will be omitted.
Only the differences will be described. As shown in FIG. 5, in the second embodiment, the external heating resistor 38 is connected in series to the positive temperature coefficient thermistor 39, and like the first embodiment, the external heating resistor 38 is a current during normal use. The wattage is set so that the positive temperature coefficient thermistor 39 is not operated by the heat generated by.
【００３０】このときに電動機３にロック等の過大電流
が流れると外部発熱抵抗３８にも過大電流が流れるた
め、該外部発熱抵抗３８が発熱し正特性サーミスタ３９
の表面温度を上昇させ、該正特性サーミスタ３９の過大
電流による温度上昇と相乗効果となり急速に正特性サー
ミスタ３９を高抵抗領域にもっていき電動機３の劣化を
防止する。At this time, if an excessive current such as a lock flows to the electric motor 3, an excessive current also flows to the external heating resistor 38, so that the external heating resistor 38 generates heat and the positive temperature coefficient thermistor 39.
The surface temperature of the positive temperature coefficient thermistor 39 is increased to have a synergistic effect with the temperature increase of the positive temperature coefficient thermistor 39 due to an excessive current, and the positive temperature coefficient thermistor 39 is rapidly brought to a high resistance region to prevent the deterioration of the motor 3.
【００３１】図６は本発明の第３実施例を示すものであ
り、上記第１実施例と同一部分の詳細な説明は省略し、
相違点のみを説明する。図６に示すように、第３実施例
においては、外部発熱抵抗器３８を別途設けるかわり
に、正特性サーミスタ３９を制御回路基板１９ａに配設
し、該正特性サーミスタ３９を電動機３の外表面に当接
させて配設している。FIG. 6 shows a third embodiment of the present invention, and a detailed description of the same parts as those in the first embodiment will be omitted.
Only the differences will be described. As shown in FIG. 6, in the third embodiment, instead of separately providing an external heating resistor 38, a positive temperature coefficient thermistor 39 is arranged on the control circuit board 19a, and the positive temperature coefficient thermistor 39 is attached to the outer surface of the electric motor 3. It is placed in contact with.
【００３２】吸込具を使用する際には、この吸込具を図
示しない電気掃除機本体に連通するホース，延長管に接
続し、掃除機本体を運転する。電動機３は正特性サーミ
スタ３９，外部発熱抵抗３８，電圧降下用抵抗器４０を
介して給電され回転を行う。このようにして構成された
吸込具は通常使用時には掃除機本体の吸気により正特性
サーミスタ３９及び電動機３を冷却しながら電動機３を
駆動している。尚、正特性サーミスタ３９は夏場の通常
使用時の電流による電動機３の外表面の発熱では正特性
サーミスタ３９を動作させないような抵抗値に設定して
ある。When the suction tool is used, the suction tool is connected to a hose and an extension pipe which communicate with a vacuum cleaner body (not shown), and the vacuum cleaner body is operated. The electric motor 3 is supplied with power via the positive temperature coefficient thermistor 39, the external heating resistor 38, and the voltage drop resistor 40 to rotate. In the normal use, the suction tool configured in this manner drives the electric motor 3 while cooling the positive temperature coefficient thermistor 39 and the electric motor 3 by the intake air of the cleaner body. The PTC thermistor 39 is set to a resistance value such that the PTC thermistor 39 does not operate due to heat generated on the outer surface of the electric motor 3 due to current during normal use in summer.
【００３３】このときに電動機３にロック等の過大電流
が流れると電動機３が発熱し当該電動機３の外表面の温
度が上昇し、この熱により正特性サーミスタ３９の表面
温度を上昇させ、該正特性サーミスタ３９の過大電流に
よる温度上昇と相乗効果となり急速に正特性サーミスタ
３９を高抵抗領域にもっていき電動機３の劣化を防止す
る。At this time, if an excessive current such as a lock flows through the electric motor 3, the electric motor 3 generates heat and the temperature of the outer surface of the electric motor 3 rises. This heat causes the surface temperature of the positive temperature coefficient thermistor 39 to rise and The temperature rise due to the excessive current of the characteristic thermistor 39 has a synergistic effect, and the positive characteristic thermistor 39 is rapidly brought to the high resistance region to prevent the deterioration of the electric motor 3.
【００３４】[0034]
【発明の効果】本発明の電気掃除機の吸込具は上記のよ
うな構成であるから、吸込具の小型化にともない回転ブ
ラシのロック時のような過大電流と通常使用時の電流の
が少ない低トルクの小型電動機の使用においても、抵抗
の発熱を利用して室温の変化に影響されることなく正特
性サーミスタの動作速度を速めることができ、電動機の
ロック時や過負荷時等の異常時の過大電流を早期に押さ
えることができ電動機の劣化を確実に防止する。Since the suction tool of the electric vacuum cleaner according to the present invention has the above-described structure, the excessive current such as when the rotary brush is locked and the current during normal use are small with the downsizing of the suction tool. Even when using a small motor with low torque, the operating speed of the PTC thermistor can be increased without being affected by changes in room temperature by utilizing the heat generated by resistance, and when the motor is in an abnormal state such as locked or overloaded. The excessive current of can be suppressed early and the deterioration of the motor can be surely prevented.
【００３５】また、電動機の外表面に正特性サーミスタ
を当接して配設させて該電動機の熱を効果的に利用して
室温の変化に影響されることなく正特性サーミスタの動
作速度を速めることができ、電動機のロック時や過負荷
時等の異常時の過大電流を早期に押さえることができ電
動機の劣化を確実に防止する。Further, a positive temperature coefficient thermistor is disposed in contact with the outer surface of the electric motor to effectively utilize the heat of the electric motor to increase the operating speed of the positive temperature coefficient thermistor without being affected by the change in room temperature. Therefore, it is possible to suppress excessive current when the motor is locked or when there is an abnormality such as overload, and to prevent deterioration of the motor without fail.
【図１】本発明の第１実施例の電動機の吸込具を示し上
ケースを取り外し一部を断面図示した平面図である。FIG. 1 is a plan view showing a suction tool for an electric motor according to a first embodiment of the present invention, with an upper case removed and a partial cross-sectional view.
【図２】図１の軸受組品部分のＡ−Ａ′断面図である。2 is a sectional view taken along the line AA ′ of the bearing assembly portion of FIG.
【図３】図１の吸込具のＢ−Ｂ′断面図である。3 is a sectional view of the suction device of FIG. 1 taken along the line BB ′.
【図４】本発明の吸込具の電気回路図である。FIG. 4 is an electric circuit diagram of the suction device of the present invention.
【図５】本発明の第２実施例の電動機の吸込具を示す電
気回路図である。FIG. 5 is an electric circuit diagram showing a suction tool of an electric motor according to a second embodiment of the present invention.
【図６】本発明の第３実施例の電動機の吸込具を示し上
ケースを取り外し一部を断面図示した平面図である。FIG. 6 is a plan view showing a suction tool of an electric motor according to a third embodiment of the present invention, with an upper case removed and a partial cross-sectional view.
【図７】従来の一例の電動機の吸込具を示し上ケースを
取り外し一部を断面図示した平面図である。FIG. 7 is a plan view showing a suction tool for an electric motor of an example of the related art, with an upper case removed and a partial cross-sectional view.
【図８】従来の吸込具の電気回路図である。FIG. 8 is an electric circuit diagram of a conventional suction device.
１ 吸込具本体 ２ 回転ブラシ ３ 電動機 ４ 伝達機構 １８ 電動機室 １９ 制御回路基板収納室 ３８ 外部発熱抵抗器 ３９ 正特性サーミスタ ４０ 電圧降下用抵抗器 1 Suction Tool Main Body 2 Rotating Brush 3 Electric Motor 4 Transmission Mechanism 18 Electric Motor Room 19 Control Circuit Board Storage Room 38 External Heating Resistor 39 Positive Characteristic Thermistor 40 Voltage Drop Resistor
Claims (2)
設けると共に、該回転ブラシを伝達機構を介して回転駆
動させる電動機を設け、該電動機に過負荷が加わった時
に当該電動機を保護する正特性サーミスタを設けた電気
掃除機の吸込具において、 上記正特性サーミスタに直列若しくは並列に当該正特性
サーミスタの動作速度を速めるための抵抗を接続し、該
抵抗を上記正特性サーミスタの近傍に設けたことを特徴
とする電気掃除機の吸込具。1. A suction brush main body is provided with a rotating brush rotatably, and an electric motor for rotating the rotating brush via a transmission mechanism is provided to protect the electric motor when an overload is applied to the electric motor. In a vacuum cleaner suction tool provided with a characteristic thermistor, a resistor for increasing the operating speed of the positive characteristic thermistor is connected in series or in parallel to the positive characteristic thermistor, and the resistor is provided in the vicinity of the positive characteristic thermistor. A suction tool for an electric vacuum cleaner, which is characterized in that
設けると共に、該回転ブラシを伝達機構を介して回転駆
動させる電動機を設け、該電動機に過負荷が加わった時
に当該電動機を保護する正特性サーミスタを設けた電気
掃除機の吸込具において、 上記正特性サーミスタを上記電動機の外表面に当接させ
て配設したことを特徴とする電気掃除機の吸込具。2. A suction brush main body is provided with a rotating brush rotatably, and an electric motor for rotating the rotating brush via a transmission mechanism is provided to protect the electric motor when an overload is applied to the electric motor. A vacuum cleaner suction tool provided with a characteristic thermistor, wherein the positive temperature coefficient thermistor is disposed in contact with an outer surface of the electric motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8837893A JPH06296568A (en) | 1993-04-15 | 1993-04-15 | Sucking device of electric vacuum cleaner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8837893A JPH06296568A (en) | 1993-04-15 | 1993-04-15 | Sucking device of electric vacuum cleaner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06296568A true JPH06296568A (en) | 1994-10-25 |
Family
ID=13941134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8837893A Pending JPH06296568A (en) | 1993-04-15 | 1993-04-15 | Sucking device of electric vacuum cleaner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06296568A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008132211A (en) * | 2006-11-29 | 2008-06-12 | Sharp Corp | Suction nozzle for vacuum cleaner |
| US7932697B2 (en) | 2006-09-07 | 2011-04-26 | Hitachi Koki Co., Ltd. | Power tool |
| WO2023120956A1 (en) * | 2021-12-23 | 2023-06-29 | 삼성전자 주식회사 | Cleaner head and cleaner comprising same |
| WO2024116597A1 (en) * | 2022-11-30 | 2024-06-06 | 株式会社コーワ | Vacuum cleaner suction implement |
-
1993
- 1993-04-15 JP JP8837893A patent/JPH06296568A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7932697B2 (en) | 2006-09-07 | 2011-04-26 | Hitachi Koki Co., Ltd. | Power tool |
| US7932701B2 (en) | 2006-09-07 | 2011-04-26 | Hitachi Koki Co., Ltd. | Power tool |
| JP2008132211A (en) * | 2006-11-29 | 2008-06-12 | Sharp Corp | Suction nozzle for vacuum cleaner |
| WO2023120956A1 (en) * | 2021-12-23 | 2023-06-29 | 삼성전자 주식회사 | Cleaner head and cleaner comprising same |
| WO2024116597A1 (en) * | 2022-11-30 | 2024-06-06 | 株式会社コーワ | Vacuum cleaner suction implement |
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