JPH04321777A - Electromagnetic pump - Google Patents

Electromagnetic pump

Info

Publication number
JPH04321777A
JPH04321777A JP8841891A JP8841891A JPH04321777A JP H04321777 A JPH04321777 A JP H04321777A JP 8841891 A JP8841891 A JP 8841891A JP 8841891 A JP8841891 A JP 8841891A JP H04321777 A JPH04321777 A JP H04321777A
Authority
JP
Japan
Prior art keywords
electromagnetic pump
coil
discharge amount
resistance
fuse
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
Application number
JP8841891A
Other languages
Japanese (ja)
Inventor
Toshio Kasada
笠田 利雄
Hiroshi Yamaguchi
博志 山口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8841891A priority Critical patent/JPH04321777A/en
Publication of JPH04321777A publication Critical patent/JPH04321777A/en
Pending legal-status Critical Current

Links

Landscapes

  • Electromagnetic Pumps, Or The Like (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

PURPOSE:To simplify countermeasures for safety when an excess electric current flows in an electromagnetic pump by using a fuse resistance instead of a solid resistance for discharge amount adjusting. CONSTITUTION:Such constitution is provided as that in an electromagnetic pump 10, one end 1a of a coil 1 is connected to a terminal a and the other end 1b is connected to a connection plate 3 on one end of a fuse resistance 2 which is connected to the coil 1 in series and a terminal b is provided on the other connection plate 4. Therefore, the variance of each discharge amount is absorbed as usual and the discharge amount can be maintained constant by the selection of a resistance value of the fuse resistance. On the other hand, when an excess electric current flows by the rare short-circuit of the coil 1, etc., the fuse resistance 2 is cut before the coil 1 is burnt so that the electromagnetic pump 10 can be stopped safely.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】0001

【産業上の利用分野】本発明は、燃焼装置に液体燃料を
供給する電磁ポンプに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic pump for supplying liquid fuel to a combustion device.

【0002】0002

【従来の技術】従来の温風暖房機においては石油を燃焼
装置に供給するためパルス電圧の印加で駆動する電磁ポ
ンプが使用されている。電磁ポンプは個々に吐出量のバ
ラツキがあるため、この吐出量のバラツキを吸収するた
めにカーボン被膜または酸化金属被膜の固定抵抗を電磁
ポンプのコイルと直列に接続し、固定抵抗の抵抗値を選
定することにより吐出量を一定に保つようにしていた。
2. Description of the Related Art Conventional hot air heaters use an electromagnetic pump driven by the application of pulsed voltage to supply oil to a combustion device. Since each electromagnetic pump has variations in discharge volume, in order to absorb this variation in discharge volume, a fixed resistor made of carbon film or metal oxide film is connected in series with the coil of the electromagnetic pump, and the resistance value of the fixed resistor is selected. By doing this, the discharge amount was kept constant.

【0003】0003

【発明が解決しようとする課題】このような従来の電磁
ポンプではコイルのレアーショート等が発生した場合、
過電流によりコイルが焼け発煙してから断線するという
問題がある。これを防ぐためには温度ヒューズを取り付
ければよいが、作業性が悪く、コストアップにつながる
という課題があった。
[Problem to be solved by the invention] In such conventional electromagnetic pumps, when a coil layer short circuit occurs,
There is a problem that the coil burns and smokes due to overcurrent and then breaks. To prevent this, it is possible to install a thermal fuse, but this poses the problem of poor workability and increased costs.

【0004】本発明は、コイルの過電流に対する安全性
を確保するうえで、作業性がよく、安価な構造の電磁ポ
ンプを得ることを目的とする。
SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic pump that is easy to work with and has an inexpensive structure while ensuring safety against coil overcurrent.

【0005】[0005]

【課題を解決するための手段】上記の目的を達成するた
め、本発明に係る電磁ポンプは、吐出量調整のための固
定抵抗に代えて、ヒューズ抵抗を用いることとしたもの
である。
[Means for Solving the Problems] In order to achieve the above object, an electromagnetic pump according to the present invention uses a fuse resistor instead of a fixed resistor for adjusting the discharge amount.

【0006】[0006]

【作用】本発明の電磁ポンプは、ヒューズ抵抗の抵抗値
を選定することにより、従来と同様に個々の吐出量のバ
ラツキを吸収し吐出量を一定にすることができる。一方
、コイルのレアーショート等により過電流が流れたとき
は、コイルが焼ける前にヒューズ抵抗が切れるので、電
磁ポンプを安全に停止させる。
[Operation] By selecting the resistance value of the fuse resistor, the electromagnetic pump of the present invention can absorb variations in individual discharge amounts and make the discharge amount constant, as in the conventional case. On the other hand, when an overcurrent flows due to a coil layer short circuit, etc., the fuse resistor is blown before the coil burns out, safely stopping the electromagnetic pump.

【0007】[0007]

【実施例】図1は本発明の一実施例を示す構成図である
。この電磁ポンプ10は、コイル1の一端1aを端子a
に接続し、他端1bをヒューズ抵抗2の一方の接続板3
に接続し、他方の接続板4に端子bを設けて、ヒューズ
抵抗2をコイル1に直列に接続した構成となっている。 電磁ポンプ10の内部にはプランジャー(図示せず)が
あり、往復運動することにより液体燃料を矢印方向に吐
出するようになっている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an embodiment of the present invention. This electromagnetic pump 10 connects one end 1a of the coil 1 to a terminal a.
and connect the other end 1b to one connecting plate 3 of the fuse resistor 2.
The fuse resistor 2 is connected to the coil 1 in series with a terminal b provided on the other connection plate 4. There is a plunger (not shown) inside the electromagnetic pump 10, which discharges liquid fuel in the direction of the arrow by reciprocating.

【0008】図2はこの電磁ポンプ10の制御ブロック
図で、11は直流の定電圧を発生する電磁ポンプ電源部
、12はトランジスタ等からなる電磁ポンプ駆動部、1
3は燃焼制御を司るマイクロコンピュータである。電磁
ポンプ10のコイル1及びヒューズ抵抗2と電磁ポンプ
駆動部12は直列に接続され、電磁ポンプ電源部11か
ら直流の定電圧が印加される。マイクロコンピュータ1
3は図示しない温度設定器からの設定信号と室温を検知
する図示しないルームサーモの検出信号を比較し、室温
が設定温度に保たれるような吐出量を得ることのできる
制御信号を発生するとともにこの制御信号をその値に対
応したパルス幅にパルス幅変調し、これを駆動パルスと
して出力するパルス幅変調回路部(図示せず)を内蔵し
ている。パルス幅変調回路部からの駆動パルスは電磁ポ
ンプ駆動部12に与えられ、電磁ポンプ電源部11の出
力する定電圧の電磁ポンプ10への印加を電磁ポンプ駆
動部12によりスイッチング制御して電磁ポンプ10を
駆動する。
FIG. 2 is a control block diagram of the electromagnetic pump 10, in which 11 is an electromagnetic pump power supply unit that generates a constant DC voltage, 12 is an electromagnetic pump drive unit consisting of transistors, etc.
3 is a microcomputer that controls combustion. The coil 1 and fuse resistor 2 of the electromagnetic pump 10 and the electromagnetic pump drive section 12 are connected in series, and a constant DC voltage is applied from the electromagnetic pump power supply section 11. Microcomputer 1
3 compares a setting signal from a temperature setting device (not shown) with a detection signal from a room thermometer (not shown) that detects the room temperature, and generates a control signal that can obtain a discharge amount such that the room temperature is maintained at the set temperature. A pulse width modulation circuit unit (not shown) that pulse width modulates this control signal to a pulse width corresponding to the value of the control signal and outputs this as a drive pulse is built-in. The drive pulse from the pulse width modulation circuit section is given to the electromagnetic pump drive section 12 , and the electromagnetic pump drive section 12 performs switching control to apply the constant voltage output from the electromagnetic pump power supply section 11 to the electromagnetic pump 10 . to drive.

【0009】図3は電磁ポンプ10に印加するパルス電
圧の波形図で、図中の斜線部15がヒューズ抵抗2の選
定された抵抗値による調整部分である。この抵抗調整部
15により吐出量のバラツキを吸収し一定の吐出量とな
るように電磁ポンプ10をセットするものである。
FIG. 3 is a waveform diagram of the pulse voltage applied to the electromagnetic pump 10, and the shaded area 15 in the figure is the area adjusted by the selected resistance value of the fuse resistor 2. The electromagnetic pump 10 is set so that the resistance adjustment section 15 absorbs variations in the discharge amount and maintains a constant discharge amount.

【0010】また、コイル1のレアーショート等により
過電流が流れたときにはこの過電流がヒューズ抵抗2を
介して流れるためコイル1が焼ける前にヒューズ抵抗2
が切れ電源供給を遮断するので、電磁ポンプ10を安全
に停止させることができる。
Furthermore, when an overcurrent flows due to a layer short circuit in the coil 1, this overcurrent flows through the fuse resistor 2, so the fuse resistor 2
Since the power is cut off and the power supply is cut off, the electromagnetic pump 10 can be safely stopped.

【0011】図4は電磁ポンプ駆動部12のトランジス
タのショート故障により、電磁ポンプ10に印加する電
圧がパルス電圧ではなく直流電圧になったときの波形で
ある。この場合も電磁ポンプ10には通常よりも過大な
電流が流れるためコイル1が発熱する。同時にヒューズ
抵抗2にも過大な電流が流れるため、ヒューズ抵抗2の
設定によりコイル1が焼損する前にヒューズ抵抗2を遮
断させて電磁ポンプを保護することもできる。
FIG. 4 shows waveforms when the voltage applied to the electromagnetic pump 10 becomes a DC voltage instead of a pulse voltage due to a short-circuit failure in the transistor of the electromagnetic pump drive unit 12. In this case as well, the coil 1 generates heat because a current larger than usual flows through the electromagnetic pump 10. At the same time, since an excessive current flows through the fuse resistor 2, the electromagnetic pump can be protected by setting the fuse resistor 2 to cut off the fuse resistor 2 before the coil 1 burns out.

【0012】0012

【発明の効果】以上のように本発明によれば、従来の吐
出量調整用の固定抵抗をヒューズ抵抗に変更するだけで
よいから、取付けが簡単であり、コスト的にもほとんど
アップしない。しかも電磁ポンプに過電流が流れたとき
の安全性を保つことができる。
As described above, according to the present invention, it is only necessary to replace the conventional fixed resistor for adjusting the discharge amount with a fuse resistor, so installation is simple and there is almost no increase in cost. Furthermore, safety can be maintained even when an overcurrent flows through the electromagnetic pump.

【図面の簡単な説明】[Brief explanation of the drawing]

【図1】本発明の一実施例を示す構成図である。FIG. 1 is a configuration diagram showing an embodiment of the present invention.

【図2】実施例の制御ブロック図である。FIG. 2 is a control block diagram of the embodiment.

【図3】ヒューズ抵抗による抵抗調整部を示す印加電圧
波形図である。
FIG. 3 is an applied voltage waveform diagram showing a resistance adjustment section using a fuse resistor.

【図4】電磁ポンプ句同部故障時の印加電圧波形図であ
る。
FIG. 4 is a diagram of applied voltage waveforms when the same part of the electromagnetic pump fails.

【符号の説明】[Explanation of symbols]

1  コイル 2  ヒューズ抵抗 10  電磁ポンプ 1 Coil 2 Fuse resistance 10 Electromagnetic pump

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】  吐出量調整用の抵抗をコイルに直列に
接続した電磁ポンプにおいて、前記抵抗をヒューズ抵抗
としたことを特徴とする電磁ポンプ。
1. An electromagnetic pump comprising a resistor for adjusting a discharge amount connected in series with a coil, wherein the resistor is a fuse resistor.
JP8841891A 1991-04-19 1991-04-19 Electromagnetic pump Pending JPH04321777A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8841891A JPH04321777A (en) 1991-04-19 1991-04-19 Electromagnetic pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8841891A JPH04321777A (en) 1991-04-19 1991-04-19 Electromagnetic pump

Publications (1)

Publication Number Publication Date
JPH04321777A true JPH04321777A (en) 1992-11-11

Family

ID=13942242

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8841891A Pending JPH04321777A (en) 1991-04-19 1991-04-19 Electromagnetic pump

Country Status (1)

Country Link
JP (1) JPH04321777A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010149600A1 (en) * 2009-06-24 2010-12-29 Nestec S.A. Thermo-fuse for a pump of a beverage machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010149600A1 (en) * 2009-06-24 2010-12-29 Nestec S.A. Thermo-fuse for a pump of a beverage machine
CN102802478A (en) * 2009-06-24 2012-11-28 雀巢产品技术援助有限公司 Thermo-fuse for a pump of a beverage machine

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