JPS5812014B2 - Vacuum cleaner overheating prevention device - Google Patents
Vacuum cleaner overheating prevention deviceInfo
- Publication number
- JPS5812014B2 JPS5812014B2 JP53001689A JP168978A JPS5812014B2 JP S5812014 B2 JPS5812014 B2 JP S5812014B2 JP 53001689 A JP53001689 A JP 53001689A JP 168978 A JP168978 A JP 168978A JP S5812014 B2 JPS5812014 B2 JP S5812014B2
- Authority
- JP
- Japan
- Prior art keywords
- valve body
- hole
- negative pressure
- transparent pipe
- outside air
- 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.)
- Expired
Links
Landscapes
- Electric Suction Cleaners (AREA)
Description
【発明の詳細な説明】
本発明は、電気掃除機の過熱防止装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an overheat prevention device for a vacuum cleaner.
従来、フィルタの目詰りにより吸込気流が不足してモー
タの冷却が不充分になって過熱することを防ぐために、
負圧室の負圧度が一定値に達したとき外気を導入してモ
ータ冷却に必要な空気流を確保することが行なわれてい
る。Conventionally, in order to prevent overheating due to insufficient cooling of the motor due to insufficient suction airflow due to filter clogging,
When the degree of negative pressure in the negative pressure chamber reaches a certain value, outside air is introduced to ensure the air flow necessary for cooling the motor.
このような機能を示す部分をリーク弁と称して種々の形
式のものが存するが、負圧度に応じて弁体の移動量が定
まることを利用してフィルタの目詰り状態を使用者に認
識させるインジケータとしての機能をもたせた形式のも
のもある。The part that exhibits this function is called a leak valve, and there are various types of leak valves, and the fact that the amount of movement of the valve body is determined according to the degree of negative pressure is used to make the user aware of the clogged state of the filter. There are also types that have the function of an indicator.
このような形式のリーク弁の構造は負圧度に応じて移動
する弁体をバネで一方向に付勢して透明パイプ内に摺動
自在に設け、あらかじめ設定した負圧度に達すると弁体
が透明パイプに形成された外気連通孔と負圧室とを連通
して外気を取り入れるようになっているものであるが、
両者間の空気通路は弁体の外周と透明パイプの内部との
間の隙間を利用している。The structure of this type of leak valve is that a valve body that moves according to the degree of negative pressure is biased in one direction by a spring and is slidably installed inside a transparent pipe, and when a preset degree of negative pressure is reached, the valve closes. The body is designed to take in outside air by communicating an outside air communication hole formed in a transparent pipe with a negative pressure chamber.
The air passage between them utilizes the gap between the outer periphery of the valve body and the inside of the transparent pipe.
そのため、動圧および空気の粘性によってリーク弁とし
て歯切れのよい動作を示さず、チャタリングが生じ易い
ものである。Therefore, due to the dynamic pressure and the viscosity of air, the leak valve does not exhibit crisp operation, and chattering is likely to occur.
また、弁体の最大移動寸法はバネめ密着長さにより管理
しているため、その寸法のバラツキが大きく、これによ
り、弁体が過大に動いてリーク時に充分な空気を取り入
れることもできない状態になる。In addition, since the maximum movement dimension of the valve body is controlled by the length of the spring fitting, there is a large variation in that dimension, which can cause the valve body to move excessively and not be able to take in sufficient air in the event of a leak. Become.
したがって、安定性が悪くて最適な外気量を得ることが
できないものである。Therefore, the stability is poor and it is not possible to obtain the optimum amount of outside air.
本発明は、このような点に鑑みなされたもので、安定し
た動作を示すとともに最適な外気量を得つつ負圧度を表
示させることができる電気掃除機の過熱防止装置を得る
ことを目的とする。The present invention was made in view of the above points, and an object of the present invention is to provide an overheating prevention device for a vacuum cleaner that can display a negative pressure degree while exhibiting stable operation and obtaining an optimal amount of outside air. do.
本発明は、端面に形成された吸気孔と側面に形成さたた
通孔とを有して通気部材により負圧室に連通された透明
パイプを設け、この透明パイプ内に前記通孔と連通可能
な側孔を有しつつその内部が通気路とされた弁体を前記
端面方向に付勢して摺動自在に設け、前記弁体の前記吸
気孔側の端部の中央に凹部を形成したこ生を特徴とする
ものである。The present invention provides a transparent pipe that has an intake hole formed on an end face and a through hole formed on a side face and communicates with a negative pressure chamber through a ventilation member, and communicates with the through hole within this transparent pipe. A valve body having a side hole and a ventilation passage inside thereof is biased toward the end face and slidably provided, and a recess is formed in the center of the end of the valve body on the side of the intake hole. It is characterized by raw octopus.
したがって、弁体の端部には凹部が形成されているため
、吸気孔からの吸込気流による動圧の影響が少なくて静
圧が安定して作用し、これにより、負圧室と外気との圧
力差との対応関係において直線性があり、安全使用状態
から危険使用状態への移行がゆるやかであり、インジケ
ータとしての性能を安定化することができるように構成
したものである。Therefore, since a concave portion is formed at the end of the valve body, the influence of dynamic pressure due to the intake airflow from the intake hole is reduced, and static pressure acts stably, thereby allowing the connection between the negative pressure chamber and the outside air. The structure is such that there is linearity in the relationship with the pressure difference, the transition from the safe use state to the dangerous use state is gradual, and the performance as an indicator can be stabilized.
本発明の実施例を図面に基いて説明する。Embodiments of the present invention will be described based on the drawings.
まず、本体1の前部にはフィルタ2が着脱自在に設けら
れる負圧室3が形成され、一部には前記負圧室3に連通
する電動送風機4を保持する電動送風機室5が設けられ
ている。First, a negative pressure chamber 3 in which a filter 2 is detachably provided is formed in the front part of the main body 1, and an electric blower chamber 5 for holding an electric blower 4 communicating with the negative pressure chamber 3 is provided in a part. ing.
そして、この電動送風機室5はとくに図示しないが排気
孔に連通している。The electric blower chamber 5 communicates with an exhaust hole, although not particularly shown.
また、前記本体1には蓋体6が着脱自在に設けられ、こ
の蓋体6には前記フィルタ2に連通する吸込孔7が形成
されているとともに後部にはインジケータ室8が形成さ
れている。Further, a lid 6 is detachably provided on the main body 1, and the lid 6 is formed with a suction hole 7 communicating with the filter 2, and an indicator chamber 8 is formed in the rear part.
このインジケータ室8の外面には外気孔9と図示しない
ゾーン表示が設けられた透明板10が設けられている。A transparent plate 10 is provided on the outer surface of the indicator chamber 8 and is provided with an outside air hole 9 and a zone display (not shown).
また、前記インジケータ室8内には前記負圧室3に連通
するリーク弁12が設けられている。Further, a leak valve 12 communicating with the negative pressure chamber 3 is provided in the indicator chamber 8 .
しかして、前記リーク弁12は前記蓋体6と下部が嵌着
された通気部材13とこの通気部材13に取付けられる
透明パイプ14とこの透明パイプ14内を摺動する弁体
15とこの弁体15を付勢する圧縮ばね16とよりなる
。The leak valve 12 consists of a ventilation member 13 whose lower part is fitted with the lid 6, a transparent pipe 14 attached to the ventilation member 13, a valve body 15 that slides inside the transparent pipe 14, and a valve body 15 that slides inside the transparent pipe 14. It consists of a compression spring 16 that biases the spring 15.
そして、前記透明パイプ14の一端は開放され他端の端
面17には所定直径の吸気孔18が形成され、側面19
の略中間位置には通孔11が形成されている。One end of the transparent pipe 14 is open, an intake hole 18 of a predetermined diameter is formed in the end surface 17 of the other end, and a side surface 19 is formed.
A through hole 11 is formed at a substantially intermediate position.
また、前記弁体15は前記透明パイプ14内を円滑に摺
動する外径をもってパイプ状に形成され、前記端面17
側に凹部20が形成される支壁21を有するとともにこ
の支壁21の吸込側には前記通孔11に一致する側孔2
2が形成されその内部は通気路23とされている。Further, the valve body 15 is formed into a pipe shape with an outer diameter that allows it to slide smoothly inside the transparent pipe 14, and the end face 17
It has a support wall 21 in which a recess 20 is formed on the side, and a side hole 2 corresponding to the through hole 11 is provided on the suction side of the support wall 21.
2 is formed, and the inside thereof is used as a ventilation passage 23.
さらに、この通気路23内には前記圧縮ばね16の一端
が当接される段部24が形成されている。Furthermore, a stepped portion 24 is formed in the air passage 23, with which one end of the compression spring 16 comes into contact.
また、前記通気部材13には垂直な通気口25とこの通
気口25に直交する保持孔26とが形成され、この保持
孔26により前記透明パイプ14は保持されている。Further, a vertical vent hole 25 and a holding hole 26 perpendicular to the vent hole 25 are formed in the ventilation member 13, and the transparent pipe 14 is held by the holding hole 26.
さらに、前記透明パイプ14が当接する部分に一致させ
て前記弁体15の摺動を規制するストッパー27が段状
に形成されている。Further, a stopper 27 is formed in a step shape so as to coincide with the portion where the transparent pipe 14 comes into contact and restricts the sliding movement of the valve body 15.
すなわち、弁体15の一端が前記ストッパー21により
位置決めされたとき、前記側孔22と前記通孔11とは
最大開口率となるよう一致するように設定されているも
のである。That is, when one end of the valve body 15 is positioned by the stopper 21, the side hole 22 and the through hole 11 are set to coincide so as to have a maximum opening ratio.
なお、28は前記圧縮ばね16の位置決めのための突起
である。Note that 28 is a projection for positioning the compression spring 16.
このような構成において、電動送風機4を駆動すると、
図示しない可撓管等を介して塵埃を含む空気が吸込孔7
より吸込まれ、フィルタ2により清浄化されるとともに
電動送風機4の内部を通ってそれを冷却しつつ排気孔よ
り排出される。In such a configuration, when the electric blower 4 is driven,
Air containing dust flows through the suction hole 7 through a flexible tube (not shown), etc.
It is sucked in by the filter 2, cleaned by the filter 2, cooled by passing through the interior of the electric blower 4, and then discharged from the exhaust hole.
このとき、フィルタ2が目詰りしていなければ、吸込孔
7より吸込まれる外気量は多いため、電動送風機4を充
分に冷却し、負圧室3内の負圧度もあまり高くないため
弁体15も吸引されない。At this time, if the filter 2 is not clogged, the amount of outside air sucked in through the suction hole 7 is large, so the electric blower 4 is sufficiently cooled, and the degree of negative pressure in the negative pressure chamber 3 is not too high, so the valve is closed. Body 15 is also not sucked.
そして、フィルタ2の目詰りの進行とともに吸込孔7か
らの吸込気流は減少し、したがって、電動送風機4の冷
却気流量も減少し、負圧室3内の負圧度も除徐に高まる
。As the filter 2 becomes clogged, the suction airflow from the suction hole 7 decreases, and therefore the flow rate of the cooling air of the electric blower 4 also decreases, and the degree of negative pressure in the negative pressure chamber 3 gradually increases.
これにより、弁体15の凹部20側は吸気孔18と外気
孔9とを経て大気圧が作用しており他側は負圧室3内の
圧力が作用しているため、左右で圧力差が生じ、この圧
力差により圧縮ばね16に抗して弁体15は一点鎖線の
位置から実線に示す位置に向けて移動する。As a result, atmospheric pressure acts on the concave portion 20 side of the valve body 15 via the intake hole 18 and the outside air hole 9, and the pressure inside the negative pressure chamber 3 acts on the other side, so there is a pressure difference between the left and right sides. This pressure difference causes the valve body 15 to move from the position shown by the dashed line to the position shown by the solid line against the compression spring 16.
この移動量は負圧度に関連するため、弁体15に色を付
けておく等の手段によりフィルタ2の目詰り状態を表示
するインジケータとしての作用もする。Since this amount of movement is related to the degree of negative pressure, the valve body 15 also functions as an indicator to indicate the clogging state of the filter 2 by means of coloring the valve body 15 or the like.
そして、負圧室3内の負圧度が所定値以上に達すると弁
体15はストッパー27により位置決めされ、通孔11
と側孔22と通気路23と通気口25とを経て外気が吸
引され、吸込孔7からの外気量が不足しても電動送風機
4を冷却するために必要な空気流は充分に得られ、その
過熱を防止する。Then, when the degree of negative pressure in the negative pressure chamber 3 reaches a predetermined value or more, the valve body 15 is positioned by the stopper 27, and the through hole 11
The outside air is sucked in through the side hole 22, the ventilation path 23, and the ventilation port 25, and even if the amount of outside air from the suction hole 7 is insufficient, the air flow necessary for cooling the electric blower 4 can be obtained sufficiently. Prevent its overheating.
したがって、負圧度及かなり高くなったときに弁体15
が移動し過ぎて通孔11と側孔22との開口率が低下し
、必要な外気量を得ることができない不都合を解消して
いる。Therefore, when the degree of negative pressure becomes considerably high, the valve body 15
This eliminates the inconvenience of not being able to obtain the necessary amount of outside air due to excessive movement of the air passage hole 11 and the opening ratio of the through hole 11 and the side hole 22.
また、弁体15が移動する過程において、外気は弁体1
5と透明パイプ14との間の隙間を経て側孔22および
通気路23を通るものであるが、動圧や空気粘度の影響
のある弁体15と透明パイプ14との隙間の長さはかな
り短かく、弁体15の全長に占める大部分の長さは通気
路23であるので、動圧や空気粘度の影響が少なく、こ
れにより、その動きが安定しており、チャタリングも生
じにくい。In addition, in the process of moving the valve body 15, the outside air flows into the valve body 1.
The valve body 15 passes through the gap between the valve body 15 and the transparent pipe 14, and then passes through the side hole 22 and the ventilation path 23. However, the length of the gap between the valve body 15 and the transparent pipe 14, which is affected by dynamic pressure and air viscosity, is quite long. Since the ventilation path 23 is short and occupies most of the entire length of the valve body 15, it is less affected by dynamic pressure and air viscosity, and as a result, its movement is stable and chattering is less likely to occur.
さらに、圧縮ばね16は弁体15がストッパー27に当
接したときにも密着状態にならないように設定されてい
る。Further, the compression spring 16 is set so that even when the valve body 15 comes into contact with the stopper 27, the valve body 15 does not come into close contact with the stopper 27.
しかして、弁体15の一側に凹部20が形成されている
ことは次のような作用をもたらす。Therefore, the formation of the recess 20 on one side of the valve body 15 brings about the following effects.
まず、凹部20がない状態から説明すると、外気と負圧
室3との圧力差が存する場合、弁体15外周と透明パイ
プ14の内周との間にはわずかな隙間が存するため 吸
気孔18から少量の空気が流入してその隙間を通る気流
が生じている。First, to explain the state without the recess 20, when there is a pressure difference between the outside air and the negative pressure chamber 3, a slight gap exists between the outer periphery of the valve body 15 and the inner periphery of the transparent pipe 14. A small amount of air flows in through the gap, creating an airflow.
そして、圧力差の拡大とともにその気流流量は増加する
が、周辺においては速度ヘッドが高くなり、弁体15の
投影断面積と静圧との積とよりもその弁体15を押圧す
る力が弱い。As the pressure difference increases, the air flow rate increases, but the velocity head becomes higher in the periphery, and the force pressing against the valve element 15 is weaker than the product of the projected cross-sectional area of the valve element 15 and the static pressure. .
そのため、圧力差との対応関係が敏感ではない。Therefore, the correspondence relationship with the pressure difference is not sensitive.
しかるに、ある値の圧力差以上となると隙間の流体抵抗
が急激に増加し、弁体15押圧力も急激に上昇してその
弁体15を急激に押してしまう。However, when the pressure difference exceeds a certain value, the fluid resistance in the gap increases rapidly, and the force for pressing the valve element 15 also increases rapidly, pushing the valve element 15 rapidly.
このことは安全使用状態の表示からすぐに危険使用状態
の表示に切りかわってしまうものであり、インジケータ
としてはきわめて性能の低いものである。This means that the display of the safe use condition immediately changes to the display of the dangerous use condition, and the performance as an indicator is extremely low.
これに反し、前述のように凹部20を設けることにより
、少なくとも凹部20内は動圧の影響を受けずに静圧が
安定して作用し、圧力差との対応関係において直線性が
あり、安全使用状態から危険使用状態にゆるやかに移行
し、インジケータとしての性能が向上する。On the other hand, by providing the recess 20 as described above, static pressure acts stably at least inside the recess 20 without being affected by dynamic pressure, and there is linearity in correspondence with the pressure difference, resulting in safety. It gradually transitions from a usage state to a dangerous usage state, improving its performance as an indicator.
本発明は、上述のように通孔および吸気孔を有する透明
パイプ内に前記通孔と重なり合う側孔を有する弁体を摺
動自在に設けたものにおいて、弁体の端部に吸気孔と対
向する凹部を形成したので、凹部内は動圧の影響を受け
ずに静圧が安定して作用し、これにより負圧室と外気と
の圧力差の対応関係において直線性があり、安全使用状
態から危険使用状態にゆるやかに移行し、インジケータ
としての安定性を高めることができるものである。The present invention provides a transparent pipe having a through hole and an intake hole as described above, in which a valve body having a side hole that overlaps with the through hole is slidably provided, and an end of the valve body facing the intake hole. Since a recess is formed in the recess, static pressure acts stably inside the recess without being affected by dynamic pressure, and as a result, there is linearity in the correspondence relationship between the pressure difference between the negative pressure chamber and the outside air, ensuring safe use. This allows for a gradual transition from the state to the dangerous use state, increasing the stability of the indicator.
図面は本発明の実施例を示すもので、第1図は電気掃除
機の一部を切欠いた側面図、第2図はインジケータの縦
断側面図である。
3・・・負圧室、13・・・通気部材、14・・・透明
パイプ、15・・・弁体、17・・・端面、18・・・
吸気孔、19・・・側面、20・・・凹部、22・・・
側孔、23・・樋気路。The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway side view of a vacuum cleaner, and FIG. 2 is a longitudinal sectional side view of an indicator. 3... Negative pressure chamber, 13... Venting member, 14... Transparent pipe, 15... Valve body, 17... End surface, 18...
Intake hole, 19...side surface, 20...recess, 22...
Side hole, 23...Gutter airway.
Claims (1)
を有して通気部材により負圧室に連通された透明パイプ
を設け、この透明パイプ内に前記通孔と連通可能な側孔
を有しつつその内部が通気路とされた弁体を前記端面方
向に付勢して摺動自在に設け、前記弁体の前記吸気孔側
の端部の中央に凹部を形成したことを特徴とする電気掃
除機の過熱防止装置。1. A transparent pipe is provided which has an intake hole formed on an end surface and a communication hole formed on a side surface and communicates with a negative pressure chamber through a ventilation member, and a side hole that can communicate with the communication hole is provided in the transparent pipe. A valve body having a ventilation passage inside the valve body is biased toward the end surface so as to be slidable, and a recess is formed in the center of the end of the valve body on the side of the intake hole. Overheating prevention device for vacuum cleaners.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53001689A JPS5812014B2 (en) | 1978-01-11 | 1978-01-11 | Vacuum cleaner overheating prevention device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53001689A JPS5812014B2 (en) | 1978-01-11 | 1978-01-11 | Vacuum cleaner overheating prevention device |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1534977A Division JPS5812012B2 (en) | 1977-02-15 | 1977-02-15 | Vacuum cleaner overheating prevention device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS53100664A JPS53100664A (en) | 1978-09-02 |
JPS5812014B2 true JPS5812014B2 (en) | 1983-03-05 |
Family
ID=11508476
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53001689A Expired JPS5812014B2 (en) | 1978-01-11 | 1978-01-11 | Vacuum cleaner overheating prevention device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5812014B2 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5546115U (en) * | 1978-09-19 | 1980-03-26 |
-
1978
- 1978-01-11 JP JP53001689A patent/JPS5812014B2/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5546115U (en) * | 1978-09-19 | 1980-03-26 |
Also Published As
Publication number | Publication date |
---|---|
JPS53100664A (en) | 1978-09-02 |
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