JP3120688U - Overload protector and equipment using the same - Google Patents

Overload protector and equipment using the same Download PDF

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JP3120688U
JP3120688U JP2006000632U JP2006000632U JP3120688U JP 3120688 U JP3120688 U JP 3120688U JP 2006000632 U JP2006000632 U JP 2006000632U JP 2006000632 U JP2006000632 U JP 2006000632U JP 3120688 U JP3120688 U JP 3120688U
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main bimetal
thermistor element
coefficient thermistor
overload protector
temperature coefficient
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幹夫 佐橋
正彦 新野
一夫 伊藤
顕彦 松家
克之 深尾
幸宏 西川
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山田電機製造株式会社
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Abstract

【課題】 拘束時の短時間動作電流値と過負荷運転時の不動作電流値の比が小さい過負荷保護器を提供する。
【解決手段】 Ｃ接点構成のサーモスイッチにより、主バイメタル加熱用の正特性サーミスタ素子を、周囲温度が設定値より低い場合は主バイメタルと被保護電動機の直列回路に並列接続し、設定値より高い場合は主バイメタルのみに並列接続するように切り替える。
【選択図】図２PROBLEM TO BE SOLVED: To provide an overload protector having a small ratio between a short-time operating current value during restraint and a non-operating current value during overload operation.
SOLUTION: A C-junction thermo switch connects a positive temperature coefficient thermistor element for main bimetal heating in parallel to a series circuit of a main bimetal and a protected motor when the ambient temperature is lower than a set value, and is higher than the set value. If so, switch to parallel connection only to the main bimetal.
[Selection] Figure 2

Description

本考案は、空調機器や電気冷蔵庫等の冷凍サイクルを構成する圧縮機を保護するのに好適な過負荷保護器およびこれを用いた機器に関する。  The present invention relates to an overload protector suitable for protecting a compressor constituting a refrigeration cycle such as an air conditioner or an electric refrigerator, and an apparatus using the same.

空調機器等に使用される出力１ＨＰを超える容量の圧縮機モータは、モータ回転子拘束時の短時間動作電流値と過負荷運転時の不動作電流値の比が小さく、従来の主として電流のみに応動する過負荷保護器では保護が不可能であった。
つまり、周囲温度が低い条件下でもモータ回転子拘束時には短時間で主バイメタルを動作させモータ巻線の温度上昇を許容値以下に抑制し、逆に、運転中で過負荷保護器の周囲温度が高い条件下でも通常予想される軽度の過負荷状態では動作させないことが要求され、その電流比が略２：１程度しかなく、通常の主バイメタルのみを用いた圧縮機外付けタイプの過負荷保護器では実現できず、やむを得ず高価なインターナル（内付け）タイプが使用されていた。Compressor motors with capacities exceeding 1 HP used for air conditioning equipment have a small ratio of the short-time operating current value when the motor rotor is constrained to the non-operating current value during overload operation. It was impossible to protect with a responding overload protector.
In other words, even when the ambient temperature is low, when the motor rotor is restrained, the main bimetal is operated in a short time to suppress the temperature rise of the motor winding to below the allowable value, and conversely, the ambient temperature of the overload protector is reduced during operation. It is required not to operate under the light overload condition normally expected even under high conditions, the current ratio is only about 2: 1, and overload protection of compressor external type using only normal main bimetal It was impossible to achieve with a vessel, and an unavoidable expensive internal (internal) type was used.

そこで本出願人は、圧縮機外郭に設置できる皿形の主バイメタルＢ等から成るプロテクタ部ＰとサーモスイッチＴＨを一体的に配設した特許文献１、特許文献２の過負荷保護器を提案した。これについて以下に説明する。  Therefore, the present applicant has proposed an overload protector of Patent Document 1 and Patent Document 2 in which a protector portion P made of a plate-shaped main bimetal B and the like that can be installed on the outer shell of the compressor and a thermo switch TH are integrally disposed. . This will be described below.

特許文献１の回路図を図６に示す。常時閉路で所定の中温度以上で開路するサーモスイッチＴＨ１と、これにより通電される抵抗器Ｒを主バイメタルＢの近傍に設け、サーモスイッチＴＨ１と抵抗器Ｒの直列回路を負荷であるモータＭと並列に接続するものである。  A circuit diagram of Patent Document 1 is shown in FIG. A thermoswitch TH1 that is normally closed and opened at a predetermined medium temperature or higher, and a resistor R that is energized thereby are provided in the vicinity of the main bimetal B, and a series circuit of the thermoswitch TH1 and the resistor R is connected to the motor M as a load. They are connected in parallel.

これにより、サーモスイッチＴＨ１が設定温度（例えば７０℃）以下であれば抵抗器Ｒが通電されて発熱し主バイメタルＢの周囲温度を上昇させるので、モータ回転子拘束時の電流値が小さくても（拘束電流と過負荷不動作電流の比が小さくても）モータ巻線の温度が許容値を超える前に主バイメタルＢを動作させることができる。又、運転中で過負荷保護器の周囲温度が高い（例えば７０℃以上）条件下では、サーモスイッチＴＨ１は開路し抵抗器Ｒが発熱しないので通常予想される軽度の過負荷状態で不必要に主バイメタルＢが動作することはない。  As a result, if the thermo switch TH1 is equal to or lower than a set temperature (for example, 70 ° C.), the resistor R is energized and generates heat to raise the ambient temperature of the main bimetal B. Therefore, even if the current value when the motor rotor is restrained is small The main bimetal B can be operated before the temperature of the motor winding exceeds the allowable value (even if the ratio between the binding current and the overload inoperative current is small). Also, when the ambient temperature of the overload protector is high during operation (for example, 70 ° C or higher), the thermoswitch TH1 is opened and the resistor R does not generate heat, so it is unnecessary in the light overload condition normally expected. The main bimetal B does not operate.

次に、特許文献２の回路図を図７に示す。主バイメタルＢに並列に接続され該主バイメタルＢを加熱する正特性サーミスタ素子ＰＴＣと、主バイメタルＢに直列に接続され該主バイメタルＢを加熱するヒータＨと、ヒータＨと並列に接続され常時開路で所定の中温度以上で閉路するサーモスイッチＴＨ２とからなる過負荷保護器で、負荷であるモータＭと直列に接続するものである。  Next, a circuit diagram of Patent Document 2 is shown in FIG. A positive temperature coefficient thermistor element PTC connected in parallel to the main bimetal B and heating the main bimetal B, a heater H connected in series to the main bimetal B and heating the main bimetal B, and connected in parallel to the heater H and always open And an overload protector comprising a thermoswitch TH2 that closes at a predetermined medium temperature or higher, and is connected in series with a motor M as a load.

この方式でも、サーモスイッチＴＨ２が設定温度（例えば７０℃）以下で開路していれば、ヒータＨが通電されて発熱し主バイメタルＢの周囲温度を上昇させるので、モータ回転子拘束時の電流値が小さくてもモータ巻線の温度が許容値を超える前に主バイメタルＢを動作させることができる。又、運転中で過負荷保護器の周囲温度が高い（例えば７０℃以上）条件下では、サーモスイッチＴＨ１は閉路しヒータＨが短絡されて発熱しないので、通常予想される軽度の過負荷状態で不必要に主バイメタルＢが動作することはない。  Also in this method, if the thermo switch TH2 is opened at a set temperature (for example, 70 ° C.) or less, the heater H is energized to generate heat and raise the ambient temperature of the main bimetal B. Therefore, the current value when the motor rotor is restrained Even if is small, the main bimetal B can be operated before the temperature of the motor winding exceeds the allowable value. Also, under conditions where the ambient temperature of the overload protector is high during operation (eg, 70 ° C or higher), the thermo switch TH1 is closed and the heater H is short-circuited and does not generate heat. The main bimetal B does not operate unnecessarily.

更に、主バイメタルＢに並列に正特性サーミスタ素子ＰＴＣが接続されているため、モータ回転子拘束により主バイメタルＢが動作すると正特性サーミスタ素子ＰＴＣに略電源電圧が印可され発熱し、主バイメタルＢが加熱されて復帰時間が遅くなる。
このため、モータの拘束状態が続いて主バイメタルＢが動作、復帰を繰り返しても動作時間が短く復帰時間が長くなることで通電率が低くなり、モータ巻線の温度上昇を抑制することができる。
公開特許公報平６−４４８８４ 国際公開公報ＷＯ２００５／０３６５７９Ａ１ Further, since the positive temperature coefficient thermistor element PTC is connected in parallel to the main bimetal B, when the main bimetal B is operated by the motor rotor restraint, a substantially power supply voltage is applied to the positive characteristic thermistor element PTC and heat is generated. Heating will slow down the recovery time.
For this reason, even if the main bimetal B continues to operate and return after the restraint state of the motor, the operating time is shortened and the recovery time is lengthened, so that the energization rate is lowered and the temperature rise of the motor winding can be suppressed. .
Published Patent Publication No. 6-44884 International Publication WO2005 / 036579A1

しかしながら、特許文献１の過負荷保護器では、主バイメタルが動作中（開路中）は抵抗器には通電されないため復帰時間を長くできず、出力１ＨＰを超える容量の圧縮機モータでは回転子拘束時の巻線の温度上昇を許容値以下に抑制することができなかった。  However, in the overload protector of Patent Document 1, when the main bimetal is in operation (open circuit), the resistor is not energized, so the recovery time cannot be lengthened. In a compressor motor with a capacity exceeding 1 HP, the rotor is restrained. It was not possible to suppress the temperature rise of the winding of the wire to below the allowable value.

又、特許文献２の過負荷保護器では、サーモスイッチはモータ電流を直に開閉するため、出力１ＨＰを超える容量の圧縮機モータでは電流値が大きくなり、通電によるジュール熱で自己発熱して過負荷保護器内部温度を上昇させ、主バイメタルの不動作電流値を下げてしまうという問題があった。  In the overload protector disclosed in Patent Document 2, the thermoswitch directly opens and closes the motor current. Therefore, the compressor motor with a capacity exceeding 1 HP output has a large current value, and self-heats due to the Joule heat generated by energization. There was a problem that the internal temperature of the load protector was raised and the inactive current value of the main bimetal was lowered.

本考案は、上述した課題を解決するためになされたものであり、その目的とするところは、出力１ＨＰを超える容量の圧縮機モータの焼損保護ができる、圧縮機外付けタイプの過負荷保護器を安価に提供することにある。  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an overload protector of an external compressor type that can protect a compressor motor having a capacity exceeding 1 HP from burning. Is to provide at a low cost.

上記目的を達成するため、請求項１の考案は、被保護電動機と直列に接続され、通電される電流が増大することによって電流を遮断する主バイメタルと、該主バイメタルを加熱する正特性サーミスタ素子と、該正特性サーミスタ素子の接続を周囲温度により切り替えるサーモスイッチから成る過負荷保護器において、
前記サーモスイッチは、前記正特性サーミスタ素子を、周囲温度が設定値より低い場合は前記主バイメタルと被保護電動機の直列回路に並列接続し、設定値より高い場合は主バイメタルのみに並列接続するように切り替えるＣ接点構成であることを技術的特徴とする。In order to achieve the above object, a device according to claim 1 is connected to a protected motor in series, and a main bimetal that cuts off a current when an energized current increases, and a positive temperature coefficient thermistor element that heats the main bimetal. And an overload protector comprising a thermoswitch that switches the connection of the positive temperature coefficient thermistor element according to the ambient temperature,
The thermo switch is configured such that the positive temperature coefficient thermistor element is connected in parallel to the series circuit of the main bimetal and the protected motor when the ambient temperature is lower than a set value, and is connected in parallel only to the main bimetal when the ambient temperature is higher than the set value. It is a technical feature that the C contact point configuration is switched to.

請求項２の考案は、被保護電動機と直列に接続され、通電される電流が増大することによって電流を遮断する主バイメタルと、該主バイメタルを加熱する正特性サーミスタ素子と、該正特性サーミスタ素子の接続を周囲温度により通電、又は非通電とするサーモスイッチから成る過負荷保護器において、
前記サーモスイッチは、前記正特性サーミスタ素子を、周囲温度が設定値より低い場合は前記主バイメタルと被保護電動機の直列回路に並列接続し、設定値より高い場合は接点を開くＢ接点構成であることを技術的特徴とするThe invention according to claim 2 is connected in series with the motor to be protected, and the main bimetal that cuts off the current when the energized current increases, the positive temperature coefficient thermistor element that heats the main bimetal, and the positive temperature coefficient thermistor element In an overload protector consisting of a thermoswitch that energizes or de-energizes the connection at ambient temperature,
The thermo switch has a B contact configuration in which the positive temperature coefficient thermistor element is connected in parallel to a series circuit of the main bimetal and the protected motor when the ambient temperature is lower than a set value, and the contact is opened when the ambient temperature is higher than the set value. Is a technical feature

請求項３の考案は、被保護電動機と直列に接続され、通電される電流が増大することによって電流を遮断する主バイメタルと、該主バイメタルを加熱する円板状で両側に電極面を有する正特性サーミスタ素子と、該正特性サーミスタ素子を周囲温度により通電、又は非通電とするサーモスイッチから成る過負荷保護器において、
前記サーモスイッチの一方の端子と前記正特性サーミスタ素子の一方の電極面とをバネ端子を介して直列接続し、
前記正特性サーミスタ素子の他方の電極面は、前記主バイメタル中央の***を貫通して該主バイメタルと熱的、及び電気的に接続された主バイメタル保持兼動作温度調整用ねじの頭部と、金属の薄板を介して良熱伝導状態で電気的に接続され、
前記サーモスイッチの他方の端子は、前記被保護電動機と電源ラインとの接続点に接続され、
前記サーモスイッチは、周囲温度が設定値より低い場合は接点を閉じ、設定値より高い場合は接点を開くＢ接点構成であることを技術的特徴とする。The device of claim 3 is connected in series with the motor to be protected, and the main bimetal that cuts off the current when the energized current is increased, and a positive electrode having electrode surfaces on both sides in a disk shape that heats the main bimetal. In an overload protector composed of a characteristic thermistor element and a thermo switch for energizing or de-energizing the positive temperature coefficient thermistor element according to the ambient temperature,
One terminal of the thermo switch and one electrode surface of the positive temperature coefficient thermistor element are connected in series via a spring terminal,
The other electrode surface of the positive temperature coefficient thermistor element passes through a small hole in the center of the main bimetal, and the head of the main bimetal holding and operating temperature adjusting screw that is thermally and electrically connected to the main bimetal; Electrically connected in good heat conduction state through a thin metal plate,
The other terminal of the thermo switch is connected to a connection point between the protected motor and a power line,
The thermo switch has a B contact configuration that closes the contact when the ambient temperature is lower than a set value and opens the contact when the ambient temperature is higher than the set value.

請求項４の考案は、請求項１もしくは２記載の過負荷保護器において、主バイメタル加熱用に、正特性サーミスタ素子に代えて抵抗器を用いたことを技術的特徴とする。  The invention of claim 4 is characterized in that, in the overload protector according to claim 1 or 2, a resistor is used in place of the positive temperature coefficient thermistor element for heating the main bimetal.

請求項１の過負荷保護器では、周囲温度がサーモスイッチの設定値以下では、正特性サーミスタ素子に常時通電されるため、モータ回転子拘束時には短時間で主バイメタルを動作させ、更に復帰までの時間を長くすることができる。
又、周囲温度がサーモスイッチの設定値以上では、通常（主バイメタル閉路中）は正特性サーミスタ素子に通電されず、運転継続が必要な軽度の過負荷電流値（過負荷不動作電流値）を低下させることがない。この場合でも回転子拘束による主バイメタルの動作時には正特性サーミスタ素子に通電され復帰までの時間を長くすることができ、モータ巻線の温度上昇を許容値以下に抑制することができる。
更に、サーモスイッチには、正特性サーミスタ素子を加熱するのに必要な数十ｍＡから百数十ｍＡの僅かな電流しか流れないため、自己発熱もなく設定温度で正確に動作可能となり、２ＨＰ以上の高容量の圧縮機モータにも使用できる。In the overload protector according to claim 1, when the ambient temperature is equal to or lower than the set value of the thermoswitch, the positive temperature coefficient thermistor element is always energized. The time can be lengthened.
Also, if the ambient temperature is higher than the set value of the thermo switch, the normal thermistor element is not energized normally (when the main bimetal is closed), and a light overload current value (overload inactive current value) that requires continued operation There is no reduction. Even in this case, during the operation of the main bimetal due to the rotor restraint, the time until the positive characteristic thermistor element is energized and returned can be lengthened, and the temperature rise of the motor winding can be suppressed to an allowable value or less.
Furthermore, since only a small current of several tens to several hundreds of mA necessary for heating the positive temperature coefficient thermistor element flows through the thermo switch, it can operate accurately at the set temperature without self-heating, and more than 2HP It can also be used for high capacity compressor motors.

請求項２の過負荷保護器では、周囲温度がサーモスイッチの設定値以下では請求項１の過負荷保護器と同じく、正特性サーミスタ素子に常時通電され、モータ回転子拘束時には短時間で主バイメタルを動作させ、更に復帰までの時間を長くすることができる。
又、周囲温度がサーモスイッチの設定値以上では、正特性サーミスタ素子に通電されず、過負荷不動作電流値を低下させることがない。この場合回転子拘束による主バイメタルの動作時には正特性サーミスタ素子に通電されず復帰までの時間を長くすることはできないが、１ＨＰ〜１．５ＨＰ程度の中容量の圧縮機モータには十分適用できる。
更に、サーモスイッチには、正特性サーミスタ素子を加熱するのに必要な僅かな電流しか流れないことに加え、構造が簡単で安価なＢ接点タイプを使用できる。In the overload protector according to claim 2, when the ambient temperature is equal to or lower than the set value of the thermoswitch, the positive temperature coefficient thermistor element is always energized as in the case of the overload protector of claim 1, and the main bimetal is quickly turned on when the motor rotor is restrained. Can be operated, and the time until return can be further extended.
Further, when the ambient temperature is equal to or higher than the set value of the thermo switch, the positive temperature coefficient thermistor element is not energized and the overload inactive current value is not lowered. In this case, during operation of the main bimetal due to the rotor restraint, the positive temperature coefficient thermistor element is not energized and the time until return cannot be lengthened, but it can be sufficiently applied to a medium capacity compressor motor of about 1 HP to 1.5 HP.
Further, the thermoswitch can use a B contact type that is simple in structure and inexpensive, in addition to flowing a small amount of current necessary for heating the positive temperature coefficient thermistor element.

請求項３の過負荷保護器では、周囲温度がサーモスイッチの設定値以下の場合に、主バイメタル通電中は正特性サーミスタ素子にも通電され、モータ回転子拘束時に短時間で主バイメタルを動作させることができる。更に、発熱体の正特性サーミスタ素子と主バイメタルが、熱、及び電気の良導体である銅合金等の薄板と調整用ねじの頭部を介して熱抵抗の小さい状態で接続されているので、正特性サーミスタ素子の発熱を素早く主バイメタルに伝えることができ、主バイメタルの動作を一段と早めることができる。
主バイメタル動作中（開路中）は正特性サーミスタ素子には通電されないが、正特性サーミスタ素子と主バイメタルの熱伝導が優れているため、熱容量が比較的大きい正特性サーミスタ素子の余熱が主バイメタルに伝わり、復帰までの時間を長くする効果もある。
更に、サーモスイッチには、請求項２の過負荷保護器と同様小容量のＢ接点タイプを使用できる。In the overload protector according to claim 3, when the main bimetal is energized, the positive temperature coefficient thermistor element is energized when the ambient temperature is equal to or lower than the set value of the thermoswitch, and the main bimetal is operated in a short time when the motor rotor is restrained. be able to. Furthermore, since the positive temperature coefficient thermistor element of the heating element and the main bimetal are connected to a thin plate of copper alloy or the like, which is a good conductor of heat and electricity, through a head of the adjusting screw, the thermal resistance is small. The heat generated by the characteristic thermistor element can be quickly transmitted to the main bimetal, and the operation of the main bimetal can be further accelerated.
While the main bimetal is operating (open circuit), the positive temperature coefficient thermistor element is not energized, but because the heat transfer between the positive temperature coefficient thermistor element and the main bimetal is excellent, the residual heat of the positive temperature coefficient thermistor element with a relatively large heat capacity is transferred to the main bimetal It also has the effect of extending the time to return and return.
Further, the thermoswitch can use a small-capacity B contact type as in the overload protector of claim 2.

請求項４の過負荷保護器では、請求項１もしくは２の過負荷保護器の正特性サーミスタ素子に代えて安価な抵抗器を使用するため、正特性サーミスタ素子の特徴（常温抵抗値が低いため突入電流が流れ素早く高温になる。安定温度が電源電圧や周囲温度の影響を受けにくい。）がなくなり保護性能は若干悪くなるが、安価な過負荷保護器を提供することができる。  In the overload protector of claim 4, since an inexpensive resistor is used instead of the positive thermistor element of the overload protector of claim 1 or 2, the characteristics of the positive temperature coefficient thermistor element (because the normal temperature resistance value is low). Inrush current flows quickly and the temperature rises quickly.Stable temperature is not easily affected by power supply voltage and ambient temperature.) Protection performance is slightly worse, but an inexpensive overload protector can be provided.

［第１実施形態］
本考案の請求項１を示す第１実施形態の構成を図１〜図２を参照して説明する。図１（Ａ）は過負荷保護器の平面図、図１（Ｂ）は右側面図、図１（Ｃ）は正面図、図１（Ｄ）はＡ１−Ａ２で切断した矢視図、図１（Ｅ）はサーモスイッチと取付具を外した状態でＢ１−Ｂ２で切断した矢視図である。
過負荷保護器１０は、圧縮機等の被保護体の外面に取り付けられる。１は絶縁物製で一端解放の筒状ケースで、プロテクタ部２０と所定の温度で接点の接続が切り替わるＣ接点構成のサーモスイッチ３０が筒状ケース１の開放端に向かって併設されている。[First Embodiment]
The configuration of the first embodiment showing claim 1 of the present invention will be described with reference to FIGS. 1A is a plan view of an overload protector, FIG. 1B is a right side view, FIG. 1C is a front view, and FIG. 1D is an arrow view cut along A1-A2. 1 (E) is an arrow view cut along B1-B2 with the thermoswitch and the fixture removed.
The overload protector 10 is attached to the outer surface of a protected body such as a compressor. Reference numeral 1 denotes a cylindrical case made of an insulating material and having one end released. A thermoswitch 30 having a C contact configuration that switches the contact between the protector unit 20 at a predetermined temperature is provided side by side toward the open end of the cylindrical case 1.

プロテクタ部２０の機械的構成について説明する。プロテクタ部２０は、皿形の主バイメタル２１、主バイメタルの動作温度調整用の調整ねじ２２、調整ねじ固定用のナット３５、コイルばね２３を備え、主バイメタル２１はコイルばね２３により調整ねじ２２の頭部２２Ａに押し当て保持されている。２４、２４は筒状ケース１の底部に植設された固定接点板で固定接点２５、２５を備え、外部端２４Ａ、２４Ａはそれぞれリード線の半田付けを容易にするためカールされている。２６、２６は主バイメタル２１に設けられた可動接点で、それぞれ固定接点２５、２５に対向接離する。調整ねじ２２の頭部２２Ａにはマイカ等の耐熱性絶縁物の薄板による絶縁板２７と、ばね性金属の薄板による電極端子２８を介して正特性サーミスタ素子５０が配置されている。電極端子２８の一部は延長されその端部は円弧状に折り返され、筒状ケース１の内壁面と一方の固定接点板２４の間に折り返し部のばね性を利用して圧入されている。正特性サーミスタ素子５０の下側にはばね性金属の薄板によるばね端子２９が配置され、ばね端子２９は合成樹脂からなる円板状のカバー３１とカバー３１を筒状ケース１の開放端の段部１Ａに押し付け固定するためのばね性金属の薄板による取付具３２により、正特性サーミスタ素子５０に一定の圧力を保持して押付けられており、その一端は延長されてＬ字状に曲げられ、筒状ケース１の底部に植設された中継端子３３に沿って筒状ケース１の外側に突出し、突出部２９Ａは中継端子３３の外部端３３Ａに溶接固定されている。３４はばね端子２９のＬ字状に曲げられた延長部と正特性サーミスタ素子５０及び電極端子２８の間を絶縁するための絶縁紙である。  A mechanical configuration of the protector unit 20 will be described. The protector unit 20 includes a plate-shaped main bimetal 21, an adjustment screw 22 for adjusting the operating temperature of the main bimetal, a nut 35 for fixing the adjustment screw, and a coil spring 23, and the main bimetal 21 is connected to the adjustment screw 22 by the coil spring 23. It is pressed against the head 22A. Reference numerals 24 and 24 are fixed contact plates implanted at the bottom of the cylindrical case 1 and have fixed contacts 25 and 25. The outer ends 24A and 24A are curled to facilitate soldering of the lead wires. Reference numerals 26 and 26 denote movable contacts provided on the main bimetal 21, which are opposed to and separated from the fixed contacts 25 and 25, respectively. A positive temperature coefficient thermistor element 50 is disposed on the head 22A of the adjusting screw 22 via an insulating plate 27 made of a thin plate of heat-resistant insulating material such as mica and an electrode terminal 28 made of a thin plate of spring metal. A part of the electrode terminal 28 is extended, and an end portion thereof is folded back in an arc shape. The electrode terminal 28 is press-fitted between the inner wall surface of the cylindrical case 1 and one fixed contact plate 24 by utilizing the spring property of the folded portion. A spring terminal 29 made of a spring metal thin plate is disposed below the positive temperature coefficient thermistor element 50, and the spring terminal 29 is formed by attaching a disc-shaped cover 31 made of synthetic resin and a cover 31 at the open end of the cylindrical case 1. The positive thermistor element 50 is pressed against the positive temperature coefficient thermistor element 50 by a fixture 32 made of a spring metal thin plate to be pressed against the portion 1A, and one end thereof is extended and bent into an L shape. Projecting to the outside of the cylindrical case 1 along the relay terminal 33 planted at the bottom of the cylindrical case 1, the protruding portion 29 </ b> A is welded and fixed to the external end 33 </ b> A of the relay terminal 33. Reference numeral 34 denotes an insulating paper for insulating between the L-shaped extension of the spring terminal 29 and the positive temperature coefficient thermistor element 50 and the electrode terminal 28.

次に、サーモスイッチ３０は筒状ケース１の側面の係合部１Ｂに取付具３２に挟まれる形で取付けられ接着剤３６にて係合部に固定されており、図示しないが常時開路のＡ接点、常時閉路のＢ接点、及びそれらの間を反転移動して設定温度以下ではＢ接点側、設定温度以上ではＡ接点側に接触する共通接点で構成され、Ａ接点、及び共通接点の外部引出し線３０Ａ、３０Ｃはそれぞれ端部の被覆を剥がしてかしめ取付けされた溶接端子３７を介して３０Ａは片方の固定接点板２４の外部端２４Ａの根本付近に溶接され、３０Ｃは中継端子３３の外部端３３Ａに溶接固定されている。一方Ｂ接点の外部引出し線３０Ｂは端部の被覆を剥がし外部接続しやすい状態にされている。  Next, the thermo switch 30 is attached to the engaging portion 1B on the side surface of the cylindrical case 1 so as to be sandwiched by the fixture 32, and is fixed to the engaging portion with an adhesive 36. It consists of a contact, a normally closed B contact, and a common contact that reversely moves between them and contacts the B contact side below the set temperature, and contacts the A contact side above the set temperature. The wires 30A and 30C are welded to the vicinity of the base of the outer end 24A of one fixed contact plate 24 through a welding terminal 37 that is attached by caulking the end portions of the wires 30A and 30C, and 30C is the outer end of the relay terminal 33. It is fixed to 33A by welding. On the other hand, the external lead wire 30B of the B contact is peeled off at the end so that it can be easily connected externally.

図２は過負荷保護器１０の回路図である。交流電源Ｅと圧縮機のモータＭとの間に過負荷保護器１０は配置される。過負荷保護器１０では、主バイメタル２１がモータＭと直列接続され、正特性サーミスタ素子５０はＣ接点構成のサーモスイッチ３０により常時はＢ接点側に接続されるので主バイメタル２１とモータＭの直列回路に並列接続され、設定温度（例えば６０℃）以上ではサーモスイッチ３０がＡ接点側に切り替わることで主バイメタル２１のみに並列接続される。  FIG. 2 is a circuit diagram of the overload protector 10. The overload protector 10 is disposed between the AC power source E and the compressor motor M. In the overload protector 10, the main bimetal 21 is connected in series with the motor M, and the positive temperature coefficient thermistor element 50 is always connected to the B contact side by the thermoswitch 30 having a C contact configuration, so the main bimetal 21 and the motor M are connected in series. In parallel with the circuit, when the temperature is higher than the set temperature (for example, 60 ° C.), the thermo switch 30 is switched to the A contact side, so that only the main bimetal 21 is connected.

上記説明した過負荷保護器の動作について図２を参照して説明する。
周囲温度が低い条件下で回転子拘束状態の圧縮機モータＭを始動しようとした場合、主バイメタル２１に拘束電流が流れ自己発熱すると共に、正特性サーミスタ素子５０に電源電圧が印可され突入電流により急速にキュリーポイント以上の温度（例えば１２０℃）まで上昇して主バイメタル２１を加熱することで、主バイメタル２１が比較的短時間で動作温度（例えば１６０℃）に達して反転動作しモータ回路を遮断する。又、主バイメタル２１の動作後も正特性サーミスタ素子５０は発熱を継続するため、主バイメタル２１の復帰時間が長くなり、回転子拘束が継続して主バイメタル２１が動作、復帰を繰り返す状態でもモータＭへの通電率を低くすることができ、巻線の温度上昇を許容温度以下に抑えることができる。この場合、一定時間経過後には過負荷保護器１０自体の温度上昇と圧縮機外郭表面の温度上昇により、サーモスイッチ３０が設定温度の６０℃に達してＡ接点側に切り替わり動作時間の短縮には寄与しなくなるが、この状態では周囲温度が高い場合と同様主バイメタルの自己発熱のみで短時間での動作が可能であり、動作後は正特性サーミスタ素子５０に通電されるので復帰時間を延ばすことができる。The operation of the overload protector described above will be described with reference to FIG.
When an attempt is made to start the compressor motor M in a rotor restraint state under a low ambient temperature, a restraint current flows through the main bimetal 21 and self-heats, and a power supply voltage is applied to the positive temperature coefficient thermistor element 50 and an inrush current. By rapidly increasing the temperature to a temperature above the Curie point (for example, 120 ° C.) and heating the main bimetal 21, the main bimetal 21 reaches the operating temperature (for example, 160 ° C.) in a relatively short time, and reverses to operate. Cut off. Further, since the positive temperature coefficient thermistor element 50 continues to generate heat even after the operation of the main bimetal 21, the return time of the main bimetal 21 becomes longer, and even when the main bimetal 21 repeats the operation and the return after the rotor restraint is continued, The energization rate to M can be reduced, and the temperature rise of the winding can be suppressed to an allowable temperature or less. In this case, after a certain period of time, due to the temperature rise of the overload protector 10 itself and the temperature of the outer surface of the compressor, the thermo switch 30 reaches the set temperature of 60 ° C. and switches to the A contact side to shorten the operation time. In this state, as in the case where the ambient temperature is high, the operation can be performed in a short time only by the self-heating of the main bimetal. After the operation, the positive temperature coefficient thermistor element 50 is energized, so that the recovery time is extended. Can do.

一方、通常運転中は過負荷保護器１０自体の温度上昇と圧縮機外郭表面の温度上昇により、サーモスイッチ３０は設定温度以上となりＡ接点側に切り替わっており、正特性サーミスタ素子５０は発熱していないため、継続運転が必要な軽度の過負荷状態が続いても誤動作することがない。  On the other hand, during normal operation, due to a rise in the temperature of the overload protector 10 itself and a rise in the temperature of the outer surface of the compressor, the thermoswitch 30 becomes higher than the set temperature and switches to the A contact side, and the positive temperature coefficient thermistor element 50 is generating heat. Therefore, even if a light overload condition that requires continuous operation continues, malfunction does not occur.

［第２実施形態］
図３を参照して請求項２を示す第２実施形態に係る過負荷保護器の回路構成について説明する。
図２を参照して上述した第１実施形態では、サーモスイッチ３０に切り替え式のＣ接点タイプを使用していた。これに対して、第２実施形態では常時閉路で設定温度以上で開路するＢ接点タイプを使用している。このためサーモスイッチ４０の動作後は復帰温度を延ばす効果はなくなるが、周囲温度が低い条件下では第１実施形態と同等の動作時間短縮、復帰時間遅延の効果が得られ、サーモスイッチ４０の構造も単純にできる。[Second Embodiment]
The circuit configuration of the overload protector according to the second embodiment showing claim 2 will be described with reference to FIG.
In the first embodiment described above with reference to FIG. 2, the switching C contact type is used for the thermoswitch 30. In contrast, in the second embodiment, a B contact type that is normally closed and opens at a set temperature or higher is used. For this reason, the effect of extending the return temperature after the operation of the thermo switch 40 is lost, but under the conditions where the ambient temperature is low, the effect of shortening the operation time and delaying the return time equivalent to those of the first embodiment can be obtained. Can also be simple.

図４を参照して第２実施形態に係る過負荷保護器の正特性サーミスタ素子５０に代えて抵抗器５１を用いた構造について説明する。
図４（Ｂ）は過負荷保護器の平面図、図４（Ａ）は左側面図、図４（Ｃ）はＣ１−Ｃ２で切断した矢視図、図４（Ｄ）はＤ１−Ｄ２で切断した矢視図、図４（Ｅ）は平面図のプロテクタ部を取り外しサーモスイッチを表した図、図４（Ｆ）はサーモスイッチを取り外しプロテクタ部を表した下面図である。
１は絶縁物製で一端解放の筒状ケースで、プロテクタ部２０が配設され、所定の温度で接点が開閉するＢ接点構成のサーモスイッチ４０のサーモベース２が筒状ケース１の開放端を閉じる形に組み合わされ、その外側には絶縁用の合成樹脂からなる円板状のキャップ３が接着剤により固定されている。A structure using a resistor 51 instead of the positive temperature coefficient thermistor element 50 of the overload protector according to the second embodiment will be described with reference to FIG.
4 (B) is a plan view of the overload protector, FIG. 4 (A) is a left side view, FIG. 4 (C) is an arrow view cut along C1-C2, and FIG. 4 (D) is D1-D2. FIG. 4E is a view showing the thermoswitch with the protector portion removed from the plan view, and FIG. 4F is a bottom view showing the protector portion with the thermoswitch removed.
1 is a cylindrical case made of an insulating material and is open at one end. A protector unit 20 is provided, and a thermobase 2 of a thermoswitch 40 having a B-contact configuration in which a contact opens and closes at a predetermined temperature is connected to an open end of the cylindrical case 1. A disc-shaped cap 3 made of an insulating synthetic resin is fixed to the outside by an adhesive.

プロテクタ部２０の機械的構成について説明する。プロテクタ部２０は、皿形の主バイメタル２１、調整ねじ２２、コイルばね２３を備え、主バイメタル２１は調整ねじ２２の頭部２２Ｃに押し当て保持されている。この調整ねじ２２は、ねじ部２２Ｂと頭部２２Ｃから成り、熱可溶金属２２Ｄで固定されたものである。主バイメタル２１の上側には、該主バイメタル２１を加熱する抵抗器５１が配置され、該抵抗器５１の２本のリード線５１Ａ、５１Ａは電源接続側の固定接点板２４とサーモスイッチ４０接続用の中継端子３３に溶接固定されている。  A mechanical configuration of the protector unit 20 will be described. The protector unit 20 includes a plate-shaped main bimetal 21, an adjustment screw 22, and a coil spring 23, and the main bimetal 21 is pressed against and held by a head 22 </ b> C of the adjustment screw 22. The adjusting screw 22 includes a screw portion 22B and a head portion 22C, and is fixed with a heat-soluble metal 22D. A resistor 51 for heating the main bimetal 21 is disposed above the main bimetal 21, and the two lead wires 51 </ b> A and 51 </ b> A of the resistor 51 are for connecting the fixed contact plate 24 and the thermo switch 40 on the power connection side. Are fixed to the relay terminal 33 by welding.

尚、この様なプロテクタ部４０の主バイメタル２１が被保護圧縮機の故障等で動作、復帰を長期間繰り返し固定接点２５と可動接点２６が溶着すると、調整ねじ頭部２２Ｃとねじ部２２Ｂを結合していた熱可溶金属２２Ｄが溶融し、コイルばね２３により主バイメタル２１が押し下げられ溶着していた接点を解離する。この後は主バイメタル２１が旧位置に戻ることなく非復帰式の動作となる。又、調整ねじ頭部２２Ｃとサーモスイッチ４０との間には可とう性の絶縁材４が配置され非復帰動作時に調整ねじ頭部２２Ｃがサーモスイッチ４０に接触するのを防止している。  If the main bimetal 21 of the protector 40 is operated and returned for a long time due to a failure of the protected compressor and the fixed contact 25 and the movable contact 26 are welded, the adjusting screw head 22C and the screw 22B are joined. The heat-soluble metal 22D that has been melted melts, and the main bimetal 21 is pushed down by the coil spring 23 to dissociate the welded contacts. Thereafter, the main bimetal 21 does not return to the old position and becomes a non-returnable operation. A flexible insulating material 4 is disposed between the adjusting screw head 22C and the thermo switch 40 to prevent the adjusting screw head 22C from contacting the thermo switch 40 during non-returning operation.

次に、サーモスイッチ４０の機械的構成について説明する。サーモスイッチ４０は、可動接点板４４に取付けられたサーモ可動接点４５と、可動接点板４４を支持する可動側端子４３と、該サーモ可動接点４５と接触するサーモ固定接点４２を備えたサーモ固定接点板４１と、可動接点板４４を揺動する皿形のサーモバイメタル４６とから成り、可動側端子４３の外部端４３Ａは前述の中継端子３３の外部端３３Ａに溶接固定されており、サーモ固定接点板４１の外部端４１Ａはカールされている。  Next, the mechanical configuration of the thermo switch 40 will be described. The thermo switch 40 includes a thermo movable contact 45 attached to the movable contact plate 44, a movable terminal 43 that supports the movable contact plate 44, and a thermo fixed contact 42 that contacts the thermo movable contact 45. The plate 41 and a plate-shaped thermo bimetal 46 that swings the movable contact plate 44. The external end 43A of the movable terminal 43 is welded and fixed to the external end 33A of the relay terminal 33 described above. The outer end 41A of the plate 41 is curled.

［第３実施形態］
図５を参照して第３実施形態に係る過負荷保護器の回路構成について説明する。
上述した第１実施形態及び第２実施形態では、正特性サーミスタ素子５０、又は抵抗器５１はプロテクタ部２０の固定接点板２４に接続されていた。これに対して、第３実施形態では主バイメタル２１に接続されている。具体的には、主バイメタル２１と電気的、熱的に良伝導状態にある調整ねじ２２の頭部２２Ａに銅合金の薄板による電極面保護板のみを介して正特性サーミスタ素子５０の電極面が押し当てられている。又、サーモスイッチ４０は第２実施形態と同じくＢ接点タイプを使用している。この結果、主バイメタル２１の動作後は正特性サーミスタ素子５０には通電されず、復帰時間遅延の効果は高温になった正特性サーミスタ素子５０の余熱分に限定されるが、周囲温度が低い条件下での動作時間は正特性サーミスタ素子５０の熱が絶縁物を介さずに直接主バイメタル２１に伝わるので第１実施形態や第２実施形態より早くすることができる。[Third Embodiment]
The circuit configuration of the overload protector according to the third embodiment will be described with reference to FIG.
In the first and second embodiments described above, the positive temperature coefficient thermistor element 50 or the resistor 51 is connected to the fixed contact plate 24 of the protector unit 20. On the other hand, in the third embodiment, the main bimetal 21 is connected. Specifically, the electrode surface of the positive temperature coefficient thermistor element 50 is connected to the head 22A of the adjusting screw 22 that is electrically and thermally conductive with the main bimetal 21 only through the electrode surface protection plate made of a thin plate of copper alloy. It is being pressed. The thermoswitch 40 uses the B contact type as in the second embodiment. As a result, after the operation of the main bimetal 21, the positive temperature coefficient thermistor element 50 is not energized, and the effect of delaying the recovery time is limited to the remaining heat of the high temperature characteristic thermistor element 50, but the ambient temperature is low. Since the heat of the positive temperature coefficient thermistor element 50 is directly transferred to the main bimetal 21 without passing through an insulator, the operation time below can be made faster than in the first embodiment or the second embodiment.

図１は本考案の第１実施形態に係る過負荷保護器の構成を示し、図１（Ａ）は平面図、図１（Ｂ）は右側面図、図１（Ｃ）は正面図、図１（Ｄ）はＡ１−Ａ２で切断した矢視図、図１（Ｅ）はサーモスイッチと取付具を外した状態でＢ１−Ｂ２で切断した矢視図である。FIG. 1 shows a configuration of an overload protector according to a first embodiment of the present invention, FIG. 1 (A) is a plan view, FIG. 1 (B) is a right side view, FIG. 1 (C) is a front view, FIG. 1 (D) is an arrow view cut along A1-A2, and FIG. 1 (E) is an arrow view cut along B1-B2 with the thermoswitch and the fixture removed. 第１実施形態に係る過負荷保護器の電気回路図である。It is an electric circuit diagram of the overload protector concerning a 1st embodiment. 第２実施形態に係る過負荷保護器の電気回路図である。It is an electric circuit diagram of the overload protector which concerns on 2nd Embodiment. 第２実施形態に係る過負荷保護器の正特性サーミスタ素子５０に代えて抵抗器５１を用いた構成を示し、図４（Ｂ）は過負荷保護器の平面図、図４（Ａ）は左側面図、図４（Ｃ）はＣ１−Ｃ２で切断した矢視図、図４（Ｄ）はＤ１−Ｄ２で切断した矢視図、図４（Ｅ）は平面図のプロテクタ部を取り外しサーモスイッチを表した図、図４（Ｆ）はサーモスイッチを取り外しプロテクタ部を表した下面図である。FIG. 4B shows a configuration using a resistor 51 instead of the positive temperature coefficient thermistor element 50 of the overload protector according to the second embodiment, FIG. 4B is a plan view of the overload protector, and FIG. 4C is an arrow view cut along C1-C2, FIG. 4D is an arrow view cut along D1-D2, and FIG. 4E is a thermo switch with the protector portion removed from the plan view. FIG. 4F is a bottom view showing the protector portion with the thermoswitch removed. 第３実施形態に係る過負荷保護器の電気回路図である。It is an electric circuit diagram of the overload protector concerning a 3rd embodiment. 特許文献１の過負荷保護器の電気回路図である。FIG. 6 is an electric circuit diagram of the overload protector of Patent Document 1. 特許文献２の過負荷保護器の電気回路図である。FIG. 6 is an electric circuit diagram of an overload protector disclosed in Patent Document 2.

符号の説明Explanation of symbols

１ 筒状ケース
１Ａ 筒状ケース開放端の段部
１Ｂ 筒状ケース側面の係合部
２ サーモベース
３ キャップ
４ 絶縁材
１０ 過負荷保護器
２０ プロテクタ部
２１ 主バイメタル
２２ 調整ねじ
２２Ａ、２２Ｃ 調整ねじ頭部
２２Ｂ 調整ねじねじ部
２２Ｄ 熱可溶金属
２４ 固定接点板
２４Ａ 固定接点板外部端
２５ 固定接点
２６ 可動接点
２７ 絶縁板
２８ 電極端子
２９ ばね端子
３０、４０ サーモスイッチ
３０Ａ サーモスイッチＡ接点の外部引出し線
３０Ｂ サーモスイッチＢ接点の外部引出し線
３０Ｃ サーモスイッチ共通接点の外部引出し線
３１ カバー
３２ 取付具
３３ 中継端子
３３Ａ 中継端子の外部端
３４ 絶縁紙
３５ ナット
３６ 接着剤
３７ 溶接端子
４１ サーモ固定接点板
４１Ａ サーモ固定接点板外部端
４２ サーモ固定接点
４３ 可動側端子
４３Ａ 可動側端子外部端
４４ 可動接点板
４５ サーモ可動接点
４６ サーモバイメタル
５０ 正特性サーミスタ素子
５１ 抵抗器
５１Ａ 抵抗器のリード線DESCRIPTION OF SYMBOLS 1 Cylindrical case 1A Step part 1B of a cylindrical case open end Engaging part 2 of a cylindrical case side surface Thermo-base 3 Cap 4 Insulation material 10 Overload protector 20 Protector part 21 Main bimetal 22 Adjustment screw 22A, 22C Adjustment screw head Part 22B adjustment screw screw part 22D heat-soluble metal 24 fixed contact plate 24A fixed contact plate external end 25 fixed contact 26 movable contact 27 insulating plate 28 electrode terminal 29 spring terminal 30, 40 thermo switch 30A thermo switch A contact external lead wire 30B Thermo switch B contact external lead wire 30C Thermo switch common contact external lead wire 31 Cover 32 Fixture 33 Relay terminal 33A Relay terminal external end 34 Insulating paper 35 Nut 36 Adhesive 37 Weld terminal 41 Thermo fixed contact plate 41A Thermo Fixed contact plate outer end 42 Thermo fixed contact 43 Movable terminal 43A Possible Moving terminal external end 44 Movable contact plate 45 Thermo movable contact 46 Thermo bimetal 50 Positive characteristic thermistor element 51 Resistor 51A Resistor lead wire

Claims (5)

被保護電動機と直列に接続され、通電される電流が増大することによって電流を遮断する主バイメタルと、該主バイメタルを加熱する正特性サーミスタ素子と、該正特性サーミスタ素子の接続を周囲温度により切り替えるサーモスイッチから成る過負荷保護器において、
前記サーモスイッチは、前記正特性サーミスタ素子を、周囲温度が設定値より低い場合は前記主バイメタルと被保護電動機の直列回路に並列接続し、設定値より高い場合は主バイメタルのみに並列接続するように切り替えるＣ接点構成であることを特徴とする過負荷保護器。The main bimetal that is connected in series with the protected motor and cuts off the current when the energized current increases, the positive temperature coefficient thermistor element that heats the main bimetal, and the connection of the positive temperature coefficient thermistor element are switched according to the ambient temperature. In overload protector consisting of thermo switch,
The thermo switch is configured such that the positive temperature coefficient thermistor element is connected in parallel to the series circuit of the main bimetal and the protected motor when the ambient temperature is lower than a set value, and is connected in parallel only to the main bimetal when the ambient temperature is higher than the set value. An overload protector having a C-contact configuration for switching to 被保護電動機と直列に接続され、通電される電流が増大することによって電流を遮断する主バイメタルと、該主バイメタルを加熱する正特性サーミスタ素子と、該正特性サーミスタ素子の接続を周囲温度により通電、又は非通電とするサーモスイッチから成る過負荷保護器において、
前記サーモスイッチは、前記正特性サーミスタ素子を、周囲温度が設定値より低い場合は前記主バイメタルと被保護電動機の直列回路に並列接続し、設定値より高い場合は接点を開くＢ接点構成であることを特徴とする過負荷保護器。A main bimetal that is connected in series with the protected motor and cuts off the current when the energized current increases, a positive temperature coefficient thermistor element that heats the main bimetal, and a connection between the positive temperature coefficient thermistor element that is energized at ambient temperature In an overload protector consisting of a thermoswitch that is deenergized,
The thermo switch has a B contact configuration in which the positive temperature coefficient thermistor element is connected in parallel to a series circuit of the main bimetal and the protected motor when the ambient temperature is lower than a set value, and the contact is opened when the ambient temperature is higher than the set value. An overload protector characterized by that. 被保護電動機と直列に接続され、通電される電流が増大することによって電流を遮断する主バイメタルと、該主バイメタルを加熱する円板状で両側に電極面を有する正特性サーミスタ素子と、該正特性サーミスタ素子を周囲温度により通電、又は非通電とするサーモスイッチから成る過負荷保護器において、
前記サーモスイッチの一方の端子と前記正特性サーミスタ素子の一方の電極面とをバネ端子を介して直列接続し、
前記正特性サーミスタ素子の他方の電極面は、前記主バイメタルの中央の***を貫通して該主バイメタルと熱的、及び電気的に接続された主バイメタル保持兼動作温度調整用ネジの頭部と、金属の薄板を介して良熱伝導状態で電気的に接続され、
前記サーモスイッチの他方の端子は、前記被保護電動機と電源ラインとの接続点に接続され、
前記サーモスイッチは、周囲温度が設定値より低い場合は接点を閉じ、設定値より高い場合は接点を開くＢ接点構成であることを特徴とする過負荷保護器。A main bimetal that is connected in series with the protected motor and that cuts off the current when the energized current increases, a disc-shaped positive thermistor element that heats the main bimetal and has electrode surfaces on both sides, and the positive In the overload protector consisting of a thermo switch that turns on or off the characteristic thermistor element according to the ambient temperature,
One terminal of the thermo switch and one electrode surface of the positive temperature coefficient thermistor element are connected in series via a spring terminal,
The other electrode surface of the positive temperature coefficient thermistor element passes through a small hole in the center of the main bimetal, and the head of the main bimetal holding and operating temperature adjusting screw that is thermally and electrically connected to the main bimetal. , Electrically connected in good heat conduction state through a thin metal plate,
The other terminal of the thermo switch is connected to a connection point between the protected motor and a power line,
The overload protector according to claim 1, wherein the thermo switch has a B-contact configuration that closes the contact when the ambient temperature is lower than a set value and opens the contact when the ambient temperature is higher than the set value. 主バイメタル加熱用に、正特性サーミスタ素子に代えて抵抗器を用いたことを特徴とする請求項１もしくは２記載の過負荷保護器。  3. The overload protector according to claim 1, wherein a resistor is used instead of the positive temperature coefficient thermistor element for heating the main bimetal. 請求項１ないし４のいずれかの過負荷保護器を用いた機器。  A device using the overload protector according to claim 1.
JP2006000632U 2006-01-06 2006-01-06 Overload protector and equipment using the same Expired - Fee Related JP3120688U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020129246A1 (en) * 2018-12-21 2020-06-25 三菱電機株式会社 Air-conditioning device and control method therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020129246A1 (en) * 2018-12-21 2020-06-25 三菱電機株式会社 Air-conditioning device and control method therefor
JPWO2020129246A1 (en) * 2018-12-21 2021-09-09 三菱電機株式会社 Air conditioner and its control method

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