JPS61265192A - Water level detector of washing machine - Google Patents
Water level detector of washing machineInfo
- Publication number
- JPS61265192A JPS61265192A JP60109956A JP10995685A JPS61265192A JP S61265192 A JPS61265192 A JP S61265192A JP 60109956 A JP60109956 A JP 60109956A JP 10995685 A JP10995685 A JP 10995685A JP S61265192 A JPS61265192 A JP S61265192A
- Authority
- JP
- Japan
- Prior art keywords
- water level
- tank
- pressure
- pressure sensor
- air trap
- 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.)
- Granted
Links
Landscapes
- Detail Structures Of Washing Machines And Dryers (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は洗濯機の水位検知装置に関するものである。[Detailed description of the invention] (Industrial application field) The present invention relates to a water level detection device for a washing machine.
（従来技術とその問題点）
従来、洗濯機においては、第４図に示すように、洗濯槽
Ｃ以下単に槽と称す。）ｌの下部側壁にエアートラップ
部４を設けると共に該エアートラップ部４を連通ロアに
より槽１内部に連通させ、エアートラップ部４内の空気
圧をエアーパイプ５を介して圧力スイッチ６に導くよう
に構成し、槽１内の水位変化に伴うエアートラップ部４
内の空気圧変化を圧力スイッチ６によりとらえ、水位検
知を行なうものである。ところで、従来においては、ダ
イヤフラムを用いた機械式の圧力スイッチ６を使用して
いたが、この種の圧力スイッチ６は予め設定した水位の
みを検知する一点検知方式であって、水位の無段階検知
を行なうことができず、その上コスト的に高く、又構造
的にもエアーパイプ５が必須になる等、余り好ましいも
のではなかった。尚、第４図中、２け水、３はパルセー
タを示す・
（発明の目的）
本発明はかかる点に鑑みてなされたもので、検知圧力に
応じた信号を出力する圧電素子等の圧力センサーを利用
して水位検知を行なうことにより、水位の無段階検知を
可能とし、又エアーパイプを省略でき、コスト的にも安
価な水位検知装置を提供するものである。(Prior art and its problems) Conventionally, in a washing machine, as shown in FIG. 4, a washing tub C is simply referred to as a tub. ) An air trap section 4 is provided on the lower side wall of the tank 1, and the air trap section 4 is communicated with the inside of the tank 1 by a communicating lower, so that the air pressure inside the air trap section 4 is guided to the pressure switch 6 via the air pipe 5. The air trap part 4 is configured as a result of changes in the water level in the tank 1.
The pressure switch 6 detects changes in the air pressure inside the tank and detects the water level. By the way, in the past, a mechanical pressure switch 6 using a diaphragm was used, but this type of pressure switch 6 is a single-point detection method that detects only a preset water level, and is not a stepless detection method of water level. This was not very desirable, as it was not possible to carry out the same operation, the cost was high, and the air pipe 5 was required in terms of structure. In Fig. 4, 2 indicates water and 3 indicates a pulsator. (Objective of the Invention) The present invention has been made in view of the above points, and is a pressure sensor such as a piezoelectric element that outputs a signal according to detected pressure. By detecting the water level using the water level, stepless detection of the water level is possible, and an air pipe can be omitted, thereby providing an inexpensive water level detection device.
（発明の構成）
本発明は、槽内部に連通ずるエアートラップ部を設け、
このエアートラップ部の壁面に、槽内の水位変化に伴う
該エアートラップ部内の空気圧を検知し該検知圧力に応
じた信号を出力する圧力センサーを取り付け、どの圧力
センサーの出力信号により槽内の水位検知を行なうべく
構成し、所期の目的を達成するものである。(Structure of the Invention) The present invention provides an air trap section that communicates with the inside of the tank,
A pressure sensor is attached to the wall of this air trap section to detect the air pressure inside the air trap section as the water level changes in the tank and output a signal according to the detected pressure. It is configured to perform detection and achieve the intended purpose.
（実施例）
以下第１図乃至第３図に示した本発明の実施例について
、第４図を参照しながら詳細に説明する。(Embodiment) The embodiment of the present invention shown in FIGS. 1 to 3 will be described in detail below with reference to FIG. 4.
先ず、第１図において、圧力センサー８は例えば圧電素
子９を利用したものであり、図中１０は電極、１１はリ
ード線を示す。而して、この圧力センサー８は、エアー
トラップ部４の壁面に形設した開口部１２を密閉するよ
うに取り付け、エアートラップ部４内の空気圧を検知す
る。今、槽１内に給水を始めると、槽１の低位部から水
位が上昇し、その水位が連通ロアの上縁に達するまでは
エアートラップ部４内の空気圧が変化せず、連通ロアの
上縁以上に上昇するとエアートラップ部４内の空気圧が
変化する。この空気圧の変化を圧電素子９の歪み量に変
換し、圧電素子９の歪みによる素子自身の電荷発生量を
検知することにより電気的に水位レベルに比例した電圧
が得られる。従って、この電圧の変化をとらえることに
より槽１内の水位を無段階に検知することができる。First, in FIG. 1, a pressure sensor 8 uses, for example, a piezoelectric element 9, and in the figure, reference numeral 10 indicates an electrode, and reference numeral 11 indicates a lead wire. The pressure sensor 8 is attached so as to seal the opening 12 formed in the wall of the air trap section 4, and detects the air pressure inside the air trap section 4. Now, when water is started to be supplied into the tank 1, the water level rises from the lower part of the tank 1, and the air pressure in the air trap part 4 does not change until the water level reaches the upper edge of the communicating lower. When it rises above the edge, the air pressure inside the air trap section 4 changes. By converting this change in air pressure into the amount of distortion of the piezoelectric element 9 and detecting the amount of charge generated by the element itself due to the distortion of the piezoelectric element 9, a voltage electrically proportional to the water level can be obtained. Therefore, by detecting changes in this voltage, the water level in the tank 1 can be detected steplessly.
次に、第２図は本発明を給水制御に実施した場合の一例
を示す電気回路図であり、９は圧電素子、１３〜１６は
抵抗、２８はインピーダンス入力型オペアンプ、２９は
増巾用オペアンプを示す。而して、圧電素子９の電荷発
生をオペアンプ２８にてインピーダンス変換し、オペア
ンプ２９にて増巾するものであり、その出力特性を第３
図に示す。Next, FIG. 2 is an electric circuit diagram showing an example of the case where the present invention is implemented in water supply control, in which 9 is a piezoelectric element, 13 to 16 are resistors, 28 is an impedance input type operational amplifier, and 29 is an operational amplifier for amplification. shows. The impedance of the electric charge generated by the piezoelectric element 9 is converted by the operational amplifier 28, and the amplitude is amplified by the operational amplifier 29.
As shown in the figure.
第３図において、オペアンプ２９の出力電圧は、槽１内
の水位が連通ロアの上縁に達成するまではＯであるが、
連通ロアの上縁以上に上昇すると水位レベルに比例して
出力電圧が発生する。In FIG. 3, the output voltage of the operational amplifier 29 is O until the water level in the tank 1 reaches the upper edge of the communicating lower.
When the water level rises above the upper edge of the communication lower, an output voltage is generated in proportion to the water level.
１７〜２７は抵抗、３０〜３５はコンパレータを構成す
るオペアンプ、３６はトランジスタ、３７はトライアッ
ク、３８はコンデンサ、３９〜４４は一般的にマイクロ
コンピュータにより切り換え判断するものであるが、こ
こでは便宜上スイッチとしている。４５け給水弁、４６
〜４８は電源である。而して、上記抵抗１７〜２３はリ
セッのである。17 to 27 are resistors, 30 to 35 are operational amplifiers that constitute a comparator, 36 is a transistor, 37 is a triac, 38 is a capacitor, and 39 to 44 are switches that are generally determined by a microcomputer, but here they are shown as switches for convenience. It is said that 45 water supply valves, 46
48 is a power supply. Therefore, the resistors 17 to 23 are resettable.
今、高水位が選択されスイッチ３９がＯＮされると、オ
ペアンプ２９の出力電圧と高水位電圧Ｖ５との比較によ
り高水位検知を行なう。オペアンプ２９の出力電圧が高
水位電圧Ｖ５ より低い時には、オペアンプ３０の出力
はＨレベルにあってトランジスタ３６をＯＮ、）ライア
ック３７をＯＮとし、給水弁４５を開放動作して槽１内
に給水する。槽内の水位が上昇して所定の水位に達する
と、オペアンプ２９の出力電圧が高水位電圧Ｖ５に達し
、オペアンプ３０の出力ｕＨからＬレベルに切り換わる
。すると、トランジスタ３６が０ＦＦＬ、これに伴って
トライアック３７もＯＦＦすることにより給水弁４５を
閉じ、給水を停止する・このように、槽１内の水位が高
水位に達したことを検知して自動的に給水を停止するこ
とができる・
以下同様に、スイッチ４０〜４３により夫々の水位を検
知し給水を制御するものである。Now, when the high water level is selected and the switch 39 is turned on, the high water level is detected by comparing the output voltage of the operational amplifier 29 and the high water level voltage V5. When the output voltage of the operational amplifier 29 is lower than the high water level voltage V5, the output of the operational amplifier 30 is at H level, turning on the transistor 36, turning on the liac 37, and opening the water supply valve 45 to supply water into the tank 1. . When the water level in the tank rises and reaches a predetermined water level, the output voltage of the operational amplifier 29 reaches the high water level voltage V5, and the output uH of the operational amplifier 30 is switched to the L level. Then, the transistor 36 becomes 0FFL, and the triac 37 also turns OFF, thereby closing the water supply valve 45 and stopping the water supply. In this way, it is detected that the water level in the tank 1 has reached the high water level, and the automatic Similarly, the switches 40 to 43 detect the respective water levels and control the water supply.
尚、リセット水位は、排水時において排水完了を検出す
るための基準として使用するものである。Note that the reset water level is used as a reference for detecting completion of drainage during drainage.
排水開始当初は、槽内の水位がリセット水位より高くオ
ペアンプ２９の出力電圧もリセット電圧ＶＯより高い為
、オペアンプ３５の出力はＬレベルにある。そして、排
水が進み、槽内の水位がリセット水位以下になると、オ
ペアンプ２９の出力電圧がリセット電圧Ｖ。より低くな
り、オペアンプ３５の出力はＬからＨレベルに切換わる
。然るに、出力がＬからＨに切り換わった時点をとらえ
てタイムカウントを始め、所定時間（槽内の水位がリセ
ット水位からｏ ｔくなるまでに要する時間を求め、予
め決定しである。）の経過により排水完了を判定し、次
の動作に移行するものである。At the beginning of draining, the water level in the tank is higher than the reset water level and the output voltage of the operational amplifier 29 is also higher than the reset voltage VO, so the output of the operational amplifier 35 is at L level. Then, as the drainage progresses and the water level in the tank falls below the reset water level, the output voltage of the operational amplifier 29 becomes the reset voltage V. becomes lower, and the output of the operational amplifier 35 switches from L to H level. However, a time count is started at the moment when the output changes from L to H, and a predetermined period of time is determined (the time required for the water level in the tank to go from the reset water level to 0). The completion of drainage is determined based on the progress, and the process moves to the next operation.
（発明の効果）
以上の如く本発明にあっては、検知圧力に応じた信号を
出力する圧電素子等の圧力センサーを利用して水位検知
を行なうことにより、水位の無段階検知が可能となり、
しかも圧力センサーは従来のような圧力スイッチに比較
して安価に得られ、その上圧力センサーをエアートラッ
プ部の壁面に取り付けることによってエアーパイプを省
略でき、コスト的に極めて有利である等、頗る実用的な
効果を奏する。(Effects of the Invention) As described above, in the present invention, stepless detection of the water level is possible by detecting the water level using a pressure sensor such as a piezoelectric element that outputs a signal according to the detected pressure.
Moreover, the pressure sensor can be obtained at a lower cost than conventional pressure switches, and by attaching the pressure sensor to the wall of the air trap part, the air pipe can be omitted, making it extremely cost-effective, making it extremely practical. It has a certain effect.
尚、本発明において、圧力センサーは圧電素子を利用し
たものに限らず、例えばピエゾ歪センサー等、検知圧力
に応じた信号を出力できるものであればよい。In the present invention, the pressure sensor is not limited to one that uses a piezoelectric element, and may be any sensor that can output a signal according to the detected pressure, such as a piezo strain sensor.
第１図は本発明の実施例における圧力センサーの取り付
は部の構成説明図、第２図は本発明を給水制御に実施し
た場合の一例を示す電気回路図、１：洗濯槽、 ４：
エアートラップ部、８：圧力センサー。Fig. 1 is an explanatory diagram of the configuration of a pressure sensor installation section in an embodiment of the present invention, and Fig. 2 is an electric circuit diagram showing an example of the case where the present invention is implemented for water supply control. 1: Washing tub; 4:
Air trap section, 8: Pressure sensor.
Claims (1)
アートラップ部の壁面に、槽内の水位変化に伴う該エア
ートラップ部内の空気圧を検知し、該検知圧力に応じた
信号を出力する圧力センサーを取り付け、この圧力セン
サーの出力信号により槽内の水位検知を行なうべく構成
してなる洗濯機の水位検知装置。1. An air trap part communicating with the inside of the tank is provided, and a pressure sensor is installed on the wall of this air trap part to detect the air pressure inside the air trap part as the water level changes in the tank and output a signal according to the detected pressure. A water level detection device for a washing machine, which is configured to install a pressure sensor and detect the water level in the tub based on the output signal of the pressure sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60109956A JPH0632746B2 (en) | 1985-05-20 | 1985-05-20 | Water level detector for washing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60109956A JPH0632746B2 (en) | 1985-05-20 | 1985-05-20 | Water level detector for washing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61265192A true JPS61265192A (en) | 1986-11-22 |
| JPH0632746B2 JPH0632746B2 (en) | 1994-05-02 |
Family
ID=14523394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60109956A Expired - Fee Related JPH0632746B2 (en) | 1985-05-20 | 1985-05-20 | Water level detector for washing machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0632746B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63247546A (en) * | 1987-04-03 | 1988-10-14 | Matsushita Electric Ind Co Ltd | Remote water level sensing device |
| US5878603A (en) * | 1998-03-19 | 1999-03-09 | General Electric Company | Quiet water fill system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005058160A1 (en) * | 2003-12-17 | 2005-06-30 | Seijiro Tomita | Individual authentication system using cardiac sound waveform and/or breathing waveform pattern |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61172596A (en) * | 1985-01-29 | 1986-08-04 | 株式会社日立製作所 | Washing machine |
-
1985
- 1985-05-20 JP JP60109956A patent/JPH0632746B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61172596A (en) * | 1985-01-29 | 1986-08-04 | 株式会社日立製作所 | Washing machine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63247546A (en) * | 1987-04-03 | 1988-10-14 | Matsushita Electric Ind Co Ltd | Remote water level sensing device |
| US5878603A (en) * | 1998-03-19 | 1999-03-09 | General Electric Company | Quiet water fill system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0632746B2 (en) | 1994-05-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |