JP2640576B2 - Electromagnetic contactor - Google Patents
Electromagnetic contactorInfo
- Publication number
- JP2640576B2 JP2640576B2 JP3003624A JP362491A JP2640576B2 JP 2640576 B2 JP2640576 B2 JP 2640576B2 JP 3003624 A JP3003624 A JP 3003624A JP 362491 A JP362491 A JP 362491A JP 2640576 B2 JP2640576 B2 JP 2640576B2
- Authority
- JP
- Japan
- Prior art keywords
- contact
- support frame
- movable
- contact support
- distance
- 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 - Lifetime
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は電磁接触器、特に接点に
おける電気的性能を長期間維持するようにしたものに関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic contactor, and more particularly to an electromagnetic contactor capable of maintaining electrical performance at a contact for a long time.
【０００２】[0002]
【従来の技術】図２は従来の電磁接触器全体の機構を示
す断面図、図３は図２のIII −III 線断面図、図４は同
電磁接触器の接点支持部の使用後を示す断面図である。
図において、１は三相の電源からモータ等の負荷への通
電を行うため、間隔をあけて配置された三極の第１可動
接触子、２は各第１可動接触子１の両端に設けられた可
動接点、３は各第１可動接触子１の動きを拘束しない範
囲で一定方向に付勢する押ばね、４は三極の第１可動接
触子１を押ばね３を介して互いに一定の等間隔で平行に
支持し、且つこれら第１可動接触子１を同方向に移動さ
せる合成樹脂製の接点支持枠、４ａは接点支持枠４にお
ける後述する電磁石の駆動力を受ける支点、５は各第１
可動接触子１の可動接点２に対向する固定接点６を有
し、接点支持枠４の両側に配置された第１固定接触子、
７はモータ等の負荷への通電とは別に制御用に付加され
た第２可動接触子、８は第２可動接触子７に対向する第
２固定接触子、９は第１固定接触子を固定し、接点支持
枠４を収納する上部ケース、１０は支点支持枠４の駆動
源となる電磁石、１１は電磁石１０の駆動力を接点支持
枠４へ伝えるリンクで、電磁石１０とで接点支持枠４を
駆動させる電磁石装置を構成している。１２は電磁石１
０を収納する下部ケース、１３は接点支持枠４に取り付
けられた戻しばねである。2. Description of the Related Art FIG. 2 is a sectional view showing the entire mechanism of a conventional electromagnetic contactor, FIG. 3 is a sectional view taken along the line III--III of FIG. 2, and FIG. It is sectional drawing.
In the figure, reference numeral 1 denotes a three-pole first movable contact arranged at an interval so as to energize a load such as a motor from a three-phase power supply, and two are provided at both ends of each first movable contact 1. The movable contact 3 is a pressing spring that urges the first movable contact 1 in a fixed direction within a range that does not restrict the movement of the first movable contact 1, and 4 is a three-pole first movable contact 1 that is fixed to each other via the pressing spring 3. The contact support frame 4a made of a synthetic resin for supporting the first movable contactors 1 in the same direction and supporting the first movable contact 1 in the same direction, 4a is a fulcrum for receiving a driving force of an electromagnet described later in the contact support frame 4, and 5 is Each first
A first fixed contact that has a fixed contact 6 facing the movable contact 2 of the movable contact 1 and is disposed on both sides of the contact support frame 4;
Reference numeral 7 denotes a second movable contact added for control separately from energization of a load such as a motor, 8 denotes a second fixed contact facing the second movable contact 7, and 9 denotes a first fixed contact. An upper case for accommodating the contact support frame 4, an electromagnet 10 serving as a drive source of the fulcrum support frame 4, and a link 11 for transmitting the driving force of the electromagnet 10 to the contact support frame 4, And an electromagnet device for driving the motor. 12 is an electromagnet 1
Reference numeral 13 denotes a return spring attached to the contact support frame 4.
【０００３】ここで、接点支持枠４の材料としては通常
熱による変形での第２可動接触子７の動きを阻害しない
ため及び耐熱性を高める観点からフェノール樹脂等の熱
硬化性樹脂が使用され、機械的に弱い部分がある場合に
は布入フェノール樹脂が使用される。布入フェノール樹
脂の場合、その特性は耐熱温度が１５０℃、収縮率は１
％程度である。Here, a thermosetting resin such as a phenol resin is used as a material of the contact support frame 4 in order not to hinder the movement of the second movable contact 7 due to deformation by heat and to improve heat resistance. If there is a mechanically weak part, a phenol resin with cloth is used. In the case of cloth-containing phenolic resin, its heat resistance temperature is 150 ° C and shrinkage ratio is 1
%.
【０００４】次に、従来の電磁接触器の動作について説
明する。電磁石１０の吸引力により発した駆動力はリン
ク１１を介して接点支持枠４に伝わり、図２において接
点支持枠４を上から下へと移動させる。そして、移動し
た接点支持枠４に一定の等間隔で平行に支持されている
三極の第１可動接触子１も移動して各可動接点２と各固
定接点６との間隔を小さくし、略同時に各接点は接触
し、通電を開始する。以後、押しばね３を圧縮しながら
接点支持枠４はさらに移動し、停止した後にある位置で
電磁石１０の吸引力状態を保持する。その際、電磁石１
０の駆動力は作用し続けるが、この駆動力が消滅する
と、戻しばね１３により、接点支持枠４は図２の下から
上へと移動し、各接点はほぼ同時に開離する。Next, the operation of the conventional electromagnetic contactor will be described. The driving force generated by the attraction force of the electromagnet 10 is transmitted to the contact support frame 4 via the link 11, and moves the contact support frame 4 from top to bottom in FIG. Then, the three-pole first movable contact 1 supported in parallel by the moved contact support frame 4 at a constant equal interval also moves to reduce the interval between each movable contact 2 and each fixed contact 6, and substantially At the same time, the contacts come into contact and start energization. Thereafter, the contact support frame 4 moves further while compressing the pressing spring 3, and holds the attraction force state of the electromagnet 10 at a certain position after stopping. At that time, the electromagnet 1
Although the driving force of 0 continues to be applied, when this driving force disappears, the contact support frame 4 is moved upward from the bottom in FIG. 2 by the return spring 13, and the contacts are separated almost simultaneously.
【０００５】[0005]
【発明が解決しようとする課題】上記のような従来の電
磁接触器では、接点支持枠４に三極の第１可動接触子１
が一定の等間隔で平行に支持され、各第１可動接触子１
の可動接点２と各第１固定接触子５の固定接点６との間
隔がどの接点間でも同じ間隔Ａに形成されているため、
電磁接触器の使用初期状態では電磁石１０によって接点
支持枠４が上下に移動させられた場合、三極の第１可動
接触子１の可動接点２と三極の第１固定接触子５の固定
接点６はほぼ同時に開離するように動作する。しかしな
がら、電磁接触器の使用期間が比較的短い期間であって
も、合成樹脂製の接点支持枠４は熱収縮率が大きいた
め、可動接点２や電磁石１０から発した熱が接点支持枠
４を収縮させ、またその収縮量は飽和して図４に示すよ
うに接点間隔に差を生じさせる。その差は接点支持枠４
の駆動力の支点４ａから遠距離に位置する程接点間隔が
広くなるもので、図４に示すようにＡ＜Ｄ＜Ｅの状態と
なる。これは接点支持枠４の収縮はそれが全体的に略均
一に収縮するので、駆動力の支点４ａから遠距離に位置
するものほど影響が大きくなるためである。In the above-described conventional electromagnetic contactor, the three-pole first movable contactor 1 is mounted on the contact support frame 4.
Are supported in parallel at regular intervals, and each first movable contact 1
Since the distance between the movable contact 2 of the first fixed contact 5 and the fixed contact 6 of each first fixed contact 5 is formed at the same distance A between any contacts,
In the initial state of use of the electromagnetic contactor, when the contact support frame 4 is moved up and down by the electromagnet 10, the movable contact 2 of the first three-pole movable contact 1 and the fixed contact of the first three-contact fixed contact 5 are formed. 6 operate so as to be opened almost simultaneously. However, even when the period of use of the electromagnetic contactor is relatively short, the heat generated from the movable contacts 2 and the electromagnets 10 causes the contact support frame 4 to move through the contact support frame 4 because the synthetic resin contact support frame 4 has a large heat shrinkage. It contracts, and the amount of contraction saturates, causing a difference in the contact interval as shown in FIG. The difference is the contact support frame 4
The distance between the contact points increases as the distance from the fulcrum 4a of the driving force increases, and A <D <E, as shown in FIG. This is because the contraction of the contact support frame 4 substantially uniformly shrinks as a whole, and the influence of the contact support frame 4 becomes greater as the contact support frame 4 is located farther from the fulcrum 4a of the driving force.
【０００６】このようにＡからＥへと次第に広がった接
点間隔では開離のタイミングを狂わせてアークが一極の
接点間に集中するようになり、一極の接点消耗を早める
という問題点があった。As described above, when the contact interval gradually increases from A to E, the timing of the opening is disturbed, and the arc is concentrated between the contacts of one pole, so that there is a problem that the consumption of the contact of one pole is accelerated. Was.
【０００７】また、ＡからＥへと次第に広がった接点間
隔では、接点接触時における押ばね３による接点接触圧
力が間隔が広がった接点部分で当初よりも低下するた
め、接点消耗限界以前に接点溶着が生じ易くなるという
問題点があった。そこで、かかる問題点を解消するため
に、接点間隔が広がったときにも最少の接点接触圧力を
維持できるように接点間隔の広がり即ち接点支持枠４の
収縮分を見込んで当初に三極共、押ばね３の付勢力を大
きく設定していたが、この場合には、電磁石１０による
吸引が苦しくなるという難点があった。[0007] Further, when the contact interval gradually increases from A to E, the contact contact pressure of the pressing spring 3 at the time of contact is lower than that at the contact portion where the interval is increased. However, there is a problem that the problem is easily caused. Therefore, in order to solve such a problem, in consideration of the expansion of the contact interval, that is, the contraction of the contact support frame 4, both triodes are initially set so that the minimum contact contact pressure can be maintained even when the contact interval increases. Although the urging force of the pressing spring 3 is set to be large, in this case, there is a problem that the suction by the electromagnet 10 becomes difficult.
【０００８】本発明は上記のような問題点を解消するた
めになされたもので、接点消耗の一極集中を防止し、接
点消耗限界以前の接点溶着の発生を防止し、長期間安定
した電気的性能を維持することのできる電磁接触器を得
ることを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is intended to prevent the concentration of contact wear and to prevent the occurrence of contact welding before the limit of contact wear and to provide a stable electric power for a long time. It is an object to obtain an electromagnetic contactor capable of maintaining proper performance.
【０００９】[0009]
【課題を解決するための手段】本発明に係る電磁接触器
は、各可動接触子とこれに対向する固定接触子とで形成
される間隔が摺動する樹脂製の接点支持枠における電磁
石装置の駆動力を受ける支点から遠ざかるに従い順次狭
くなるように上記複数の可動接触子を接点支持枠に支持
させ、各可動接触子を付勢する押ばねの付勢力を接点支
持枠の駆動力を受ける支点から遠ざかるに従い順次強く
設定するか、該支点から少なくとも最も遠距離の押ばね
の付勢力を最も近距離の押ばねの付勢力よりも強く設定
するようにしたものである。SUMMARY OF THE INVENTION An electromagnetic contactor according to the present invention is an electromagnetic contactor which is formed of a movable contact and a fixed contact facing the movable contact. The plurality of movable contacts are supported on the contact support frame so as to gradually narrow as they move away from the fulcrum that receives the driving force, and the urging force of the pressing spring for urging each movable contact is applied to the fulcrum that receives the driving force of the contact support frame. , The urging force of the pressing spring at least farthest from the fulcrum is set to be stronger than the urging force of the pressing spring at the closest distance.
【００１０】また、接点支持枠をポリフェニレン・サル
ファイド樹脂で形成することが好ましい。Further, it is preferable that the contact support frame is formed of polyphenylene sulfide resin.
【００１１】[0011]
【作用】本発明においては、各可動接触子とこれに対向
する固定接触子とで形成される間隔が摺動する樹脂製の
接点支持枠における電磁石装置の駆動力を受ける支点か
ら遠ざかるに従い順次狭くなるように複数の可動接触子
を接点支持枠に支持させるようにしたから、比較的短期
間の使用により樹脂製の接点支持枠が収縮し、飽和点に
達しときに、接点支持枠の駆動力を受ける支点から遠距
離にある可動接触子と固定接触子の間隔は近距離にある
可動接触子と固定接触子の間隔と同程度になる。In the present invention, the distance between each movable contact and the fixed contact opposed thereto is gradually reduced as the distance from the fulcrum receiving the driving force of the electromagnet device in the sliding resin contact support frame increases. Since the plurality of movable contacts are supported by the contact support frame so that the contact support frame made of resin contracts due to use for a relatively short time, and reaches a saturation point, the driving force of the contact support frame is increased. The distance between the movable contact and the fixed contact located at a long distance from the fulcrum receiving the contact is substantially equal to the distance between the movable contact and the fixed contact located at a short distance.
【００１２】また、各可動接接触子を付勢する押ばねの
付勢力を接点支持枠の駆動力を受ける支点から遠ざかる
に従い順次強く設定するか、該支点から少なくとも最も
遠距離の押ばねの付勢力を最も近距離の付勢力よりも強
く設定したから、比較的短期間使用後に接点支持枠が熱
によって収縮し、接点間隔が広がって接点接触圧力が低
下しても、予め押ばねの付勢力を強くしていることでそ
の低下分が相殺され、各接点間又は一部の接点間におけ
る最小の接点接触圧力の低下が防止される。Further, the urging force of the pressing spring for urging each of the movable contactors may be sequentially set to be stronger as the distance from the fulcrum receiving the driving force of the contact support frame increases, or the urging force of the pressing spring at least farthest from the fulcrum may be set. Since the biasing force is set stronger than the closest biasing force, even if the contact support frame shrinks due to heat after a relatively short period of use, the contact interval widens and the contact contact pressure decreases, the biasing force of the pressing spring is set in advance. Is increased, the decrease is offset, and the minimum contact contact pressure between each contact or between some contacts is prevented from decreasing.
【００１３】更に、接点支持枠をポリフェニレン・サル
ファイド樹脂で形成しているから、接点支持枠の耐熱温
度は２４０℃、収縮率が０．１５％程度となり、例えば
フェノール樹脂に比べて耐熱性、収縮率の点で優れてお
り、長期間使用後の接点支持枠の収縮量は微量で可動接
触子と固定接触子の間隔を長期に且つて保持できる。Further, since the contact support frame is formed of polyphenylene sulfide resin, the contact support frame has a heat resistance temperature of 240 ° C. and a shrinkage rate of about 0.15%. The contact support frame has a small amount of contraction after a long-term use, and can maintain the distance between the movable contact and the fixed contact for a long time.
【００１４】[0014]
【実施例】図１は本発明の一実施例である電磁接触器の
接点支持部の断面図である。図３は従来の電磁接触器の
接点支持部の当初使用状態を示しているが、本発明の一
実施例である電磁接触器の接点支持部の長期使用後の状
態をも示す断面図である。図において、従来例と同一の
構成は同一符号を付して重複した構成の説明を省略す
る。この実施例では三極の第１可動接触子１とこれらに
それぞれ対向する第１固定接触子５とで形成される間隔
が接点支持枠４の駆動を受ける支点から遠ざかるに従い
順次狭くなるように、三極の第１可動接触子１が接点支
持枠４に平行に支持されている。また、各第１可動接触
子１を付勢する押しばね３の付勢力を接点支持枠４の駆
動力を受ける支点４ａから遠ざかるに従い順次強く設定
している。FIG. 1 is a sectional view of a contact support portion of an electromagnetic contactor according to an embodiment of the present invention. FIG. 3 is a sectional view showing the initial use state of the contact support of the conventional electromagnetic contactor, but also showing the state after long-term use of the contact support of the electromagnetic contactor according to one embodiment of the present invention. . In the figure, the same components as those of the conventional example are denoted by the same reference numerals, and the description of the duplicated components will be omitted. In this embodiment, the distance between the first movable contactors 1 of three poles and the first fixed contactors 5 opposing each other is gradually reduced as the distance from the fulcrum where the contact support frame 4 is driven is reduced. The three-pole first movable contact 1 is supported in parallel to the contact support frame 4. Further, the urging force of the pressing spring 3 for urging each first movable contact 1 is sequentially set to be stronger as the distance from the fulcrum 4 a receiving the driving force of the contact support frame 4 increases.
【００１５】上記のように構成された電磁接触器におい
ては、三極の第１可動接触子１とこれらにそれぞれ対向
する第１固定接触子５とで形成される間隔が接点支持枠
４の駆動力を受ける支点４ａから遠ざかるに従い順次狭
くなるように形成されているため、比較的短期間の使用
により樹脂製の接点支持枠４が可動接点２や電磁石１０
から発した熱により収縮させられ、飽和点に達したとき
に、接点支持枠４の駆動力を受ける支点４ａから最も遠
距離にある第１可動接触子１と第１固定接触子５の間隔
Ｃは最も近距離にある第１可動接触子１と第１固定接触
子５の当初の間隔Ａと同程度になる。その中間の距離に
ある第１可動接触子１と第１固定接触子５の間隔Ｂも前
記間隔Ａや間隔Ｃと同程度になる。これは、接点支持枠
４の収縮が全体的にほぼ均一に生じるので、駆動力を受
ける支点４ａから遠距離に位置するものほど影響は大き
くなるから、予めその分を見越して駆動力を受ける支点
４ａから遠距離に位置するものの間隔Ｃを狭めておけば
足りるからである。In the electromagnetic contactor constructed as described above, the distance between the first movable contacts 1 of three poles and the first fixed contacts 5 opposing to each other is set to drive the contact support frame 4. Since the contact support frame 4 made of resin is formed so as to gradually become narrower as the distance from the fulcrum 4a receiving the force increases, the movable contact 2 and the electromagnet 10
The distance C between the first movable contact 1 and the first fixed contact 5 that is farthest from the fulcrum 4a that receives the driving force of the contact support frame 4 when it is contracted by the heat generated from the contact point and reaches the saturation point. Is about the same as the initial distance A between the first movable contact 1 and the first fixed contact 5 that are closest to each other. The distance B between the first movable contact 1 and the first fixed contact 5 at the intermediate distance is also substantially equal to the distance A and the distance C. This is because the contraction of the contact support frame 4 occurs almost uniformly as a whole, so that the greater the distance from the fulcrum 4a receiving the driving force, the greater the effect. This is because it is sufficient to narrow the interval C between the objects located far from 4a.
【００１６】従って、比較的短期間から長期にわたって
使用されても、三極の第１可動接触子１の可動接点２と
これらにそれぞれ対向する第１固定接触子５の固定接点
６とでそれぞれ形成される間隙は互いに同程度となるた
め、各可動接点２と各固定接点６との開離のタイミング
が狂わず、アークが一極に集中することがなくなり、接
点消耗の一極集中もなくなった。[0016] Thus, relatively from the short period is used for a long time, respectively at a first fixed contact 6 of the fixed contacts 5 respectively opposite thereto and the movable contact 2 of the first movable contact 1 tripolar Since the gaps formed are substantially equal to each other, the timing of the separation between each movable contact 2 and each fixed contact 6 is not disturbed, the arc does not concentrate on one pole, and the contact consumable does not concentrate on one pole. .
【００１７】また、比較的短期間の使用によって接点支
持枠４が熱によって収縮し、それによって接点支持枠４
の駆動力を受けるね支点４ａの近距離から遠距離にいく
に従い可動接点２と固定接点５との間隔が次第に広くな
るのに伴って押ばね３による各接点間における接点接触
圧力も遠距離に位置するもの程、次第に低下していく
が、各第１可動接触子１を付勢する押ばね３の付勢力を
当初に接点支持枠４の駆動力を受ける支点４ａから遠ざ
かるに従い次第に強く設定しているため、接点接触圧力
の低下分が相殺されて比較的短期間の使用後に各接点間
における接点接触圧力は略等しく、しかも最小の接点接
触圧力の変化も小さくなる。従って、接点接触圧力の低
下による接点消耗限界以前の接点溶着の危険もなくな
る。In addition, the contact support frame 4 contracts due to heat due to relatively short-term use.
As the distance between the movable contact 2 and the fixed contact 5 gradually increases from the short distance to the long distance of the fulcrum 4a, the contact pressure between the contacts by the pressing spring 3 also increases with the distance. The position of the pressing member 3 for biasing each first movable contact 1 is set to gradually increase as the distance from the fulcrum 4a, which initially receives the driving force of the contact support frame 4, is gradually reduced as the position is increased. Therefore, the decrease in the contact pressure is offset, and after a relatively short period of use, the contact pressure between the contacts is substantially equal, and the minimum change in the contact pressure is small. Therefore, there is no danger of contact welding before the contact wear limit due to a decrease in contact contact pressure.
【００１８】更に、接点支持枠４の駆動力を受ける支点
４ａから最も遠距離の押ばね３の付勢力を最も近距離の
押ばね３の付勢力よりも強く設定するようにしておけ
ば、接点接触圧力の低下による接点溶着の危険は少なく
なり、しかも一部のみ押ばね３の付勢力が高まるだけで
あるから、従来例のように三極共押ばね３の付勢力を高
めたものに比べて電磁石の吸引が苦しくなるということ
もない。Further, if the urging force of the pressing spring 3 farthest from the fulcrum 4a receiving the driving force of the contact support frame 4 is set to be stronger than the urging force of the pressing spring 3 at the shortest distance, The danger of contact welding due to a decrease in contact pressure is reduced, and only a part of the urging force of the pressing spring 3 is increased. Therefore, as compared with the conventional example, the urging force of the three-pole pressing spring 3 is increased. There is no difficulty in attracting the electromagnet.
【００１９】また、接点支持枠４をポリフェニレン・サ
ルファイド樹脂で形成した場合には、三極の第１可動接
触子１の可動接点２とこれらと対向する第１固定接触子
５の固定接点６とでそれぞれ形成される間隔を図２に示
す従来例と同様に互いに同じＡにしたとしても、ポリフ
ェニレン・サルファイド樹脂は耐熱温度が２４０℃で収
縮量は０．１５％と少なく、長期間使用されても初期に
Ａであった間隔はＡのまま保持される。When the contact support frame 4 is formed of polyphenylene sulfide resin, the movable contact 2 of the three-pole first movable contact 1 and the fixed contact 6 of the first fixed contact 5 opposed thereto are formed. 2, the polyphenylene sulfide resin has a heat-resistant temperature of 240 ° C. and a small shrinkage of 0.15%, and has been used for a long time. The interval A, which was initially A, is maintained at A.
【００２０】例えば、定格電流が１２Ａクラスの電磁接
触器について、接点支持枠４がフェノール樹脂製のもの
では、可動接点２と固定接点５の間隔の極間差が約０．
５ｍｍ以上も大きくなったのに対し、ポリフェニレン・
サルファイド樹脂製のものでは０．１ｍｍもない程度
で、接点消耗、接点溶着に対して非常に良好なことが実
証されている。For example, for an electromagnetic contactor having a rated current of 12 A class, if the contact support frame 4 is made of phenolic resin, the gap between the movable contact 2 and the fixed contact 5 is about 0.
Although it is larger than 5 mm, polyphenylene
With a sulfide resin material having a thickness of less than 0.1 mm, it has been proved to be very good against contact wear and contact welding.
【００２１】[0021]
【発明の効果】本発明は以上説明したとおり、各可動接
触子とこれに対向する固定接触子とで形成される間隔が
接点支持枠の駆動力を受ける支点から遠ざかるに従い順
次狭くなるように複数の可動接触子を接点支持枠に支持
させておき、比較的短期間使用後に接点支持枠の熱によ
る収縮量が飽和した状態で複数の可動接触子の可動接点
とこれらに対向する固定接触子の固定接点とでそれぞれ
形成される間隔が等しくなるようにしたので、接点表面
が消耗して溶着の危険領域に近づいても接点開離のタイ
ミングは一致するためにアークは各極に分散され、接点
消耗の一極集中を防止できるという効果を有する。ま
た、各可動接触子を付勢する押ばねの付勢力を支点支持
枠の駆動力を受ける支点から遠ざかるに従い順次強く設
定するか、該支点から少なくとも最も遠距離の押ばねの
付勢力を最も近距離の付勢力よりも強く設定し、比較的
短期間使用後に接点支持枠が熱によって収縮し、接点間
隔が広がって接点接触圧力が低下しても予め押ばねの付
勢力を強くしていることでその低下分を相殺し、各接点
又は一部の接点間における最小の接点接触圧力の低下を
なくすようにするようにしたので、接点接触圧力の低下
による接点消耗限界以前の接点溶着の危険性が少なくな
り、電磁石装置の吸引も無理なく行えるという効果があ
る。As described above, according to the present invention, the distance between each movable contact and the fixed contact opposed thereto is gradually reduced as the distance from the fulcrum receiving the driving force of the contact support frame decreases. The movable contacts of the plurality of movable contacts and the fixed contacts facing the movable contacts in a state where the amount of contraction due to heat of the contact support frame is saturated after a relatively short period of use after the movable contacts are supported by the contact support frame. Since the intervals formed with the fixed contacts are made equal, even when the contact surface is worn and approaches the danger area of welding, the timing of contact opening coincides, so the arc is dispersed to each pole, This has the effect that overconcentration of wear can be prevented. Further, the urging force of the pressing spring for urging each movable contact may be sequentially set to be stronger as the distance from the fulcrum receiving the driving force of the fulcrum support frame increases, or the urging force of the pressing spring at least the farthest distance from the fulcrum may be set to the nearest. The urging force of the pressing spring is set to be stronger than the urging force of the distance, and the urging force of the pressing spring is strengthened in advance even if the contact support frame shrinks due to heat after a relatively short period of use and the contact contact pressure is widened and the contact contact pressure is reduced. In order to eliminate the decrease in the contact pressure and to minimize the decrease in the minimum contact pressure between each contact or some of the contacts, the danger of contact welding before the contact wear limit due to the decrease in contact contact pressure Therefore, there is an effect that suction of the electromagnet device can be easily performed.
【００２２】更に、接点支持枠をポリフェニレン・サル
ファイド樹脂で形成し、接点支持枠の収縮そのものを防
止するようにしたので、複数の可動接触子とこれらに対
向する固定接触子とで形成される間隔を同じにしたとし
ても、アークの一極集中や接点接触圧力の低下という問
題は起こらず、接点消耗の一極集中や、接点溶接の危険
性が少なくないという効果がある。Further, since the contact support frame is made of polyphenylene sulfide resin to prevent the contact support frame from contracting itself, the space formed by the plurality of movable contacts and the fixed contacts opposed thereto is provided. However, there is no problem that the concentration of the poles of the arc is concentrated or the contact pressure of the contacts is reduced, and that the concentration of the poles of the contacts is concentrated and the danger of contact welding is not small.
【図１】本発明の一実施例である電磁接触器の接点支持
部を示す断面図である。FIG. 1 is a sectional view showing a contact support portion of an electromagnetic contactor according to one embodiment of the present invention.
【図２】従来の電磁接触器全体の機構を示す断面図であ
る。FIG. 2 is a cross-sectional view showing the entire mechanism of a conventional electromagnetic contactor.
【図３】図２のIII −III 線断面図である。FIG. 3 is a sectional view taken along line III-III in FIG. 2;
【図４】同電磁接触器の接点支持部の使用後を示す断面
図である。FIG. 4 is a sectional view showing a state after using a contact support portion of the electromagnetic contactor.
１ 第１可動接触子 ３ 押ばね ４ 接点支持枠 ４ａ 支点 ５ 第１固定接触子 １０ 電磁石（電磁石装置） １１ リンク（電磁石装置） REFERENCE SIGNS LIST 1 first movable contact 3 press spring 4 contact support frame 4 a fulcrum 5 first fixed contact 10 electromagnet (electromagnet device) 11 link (electromagnet device)
Claims (2)
子と、これら可動接触子を押ばねを介して支持し、可動
接触子が並ぶ方向に摺動する樹脂性の接点支持枠と、各
可動接触子と対向して設置された固定接触子と、接点支
持枠を駆動させる電磁石装置とを備えた電磁接触器にお
いて、各可動接触子とこれに対向する固定接触子とで形
成される間隔が上記接点支持枠における電磁石装置の駆
動力を受ける支点から遠ざかるに従い順次狭くなるよう
に上記複数の可動接触子を接点支持枠に支持させ、各可
動接触子を付勢する押ばねの付勢力を接点支持枠の駆動
力を受ける支点から遠ざかるに従い順次強く設定する
か、該支点から少なくとも最も遠距離の押ばねの付勢力
を最も近距離の押ばねの付勢力よりも強く設定するよう
にしたことを特徴とする電磁接触器。1. A plurality of movable contacts arranged in parallel at intervals, a resin contact support frame which supports these movable contacts via a pressing spring and slides in the direction in which the movable contacts are arranged, In an electromagnetic contactor including a fixed contact placed opposite to each movable contact and an electromagnet device for driving the contact support frame, the electromagnetic contactor is formed by each movable contact and a fixed contact facing the movable contact. A biasing force of a pressing spring for supporting the plurality of movable contacts on the contact support frame so that the distance becomes gradually smaller as the distance from the fulcrum receiving the driving force of the electromagnet device in the contact support frame increases, and biases each movable contact. Or the biasing force of the pressing spring at least farthest from the fulcrum is set to be stronger than the biasing force of the pressing spring at the shortest distance. Characterized by Electromagnetic contactor.
子と、これら可動接触子を押ばねを介して支持し、可動
接触子が並ぶ方向に摺動する樹脂性の接点支持枠と、各
可動接触子と対向して設置された固定接触子と、接点支
持枠を駆動させる電磁石装置とを備えた電磁接触器にお
いて、接点支持枠がポリフェニレン・サルファイド樹脂
で成形されていることを特徴とする電磁接触器。2. A plurality of movable contacts arranged in parallel at intervals, a resin contact support frame supporting the movable contacts via a pressing spring and sliding in the direction in which the movable contacts are arranged, In an electromagnetic contactor provided with a fixed contact placed opposite to each movable contact and an electromagnet device for driving the contact support frame, the contact support frame is formed of polyphenylene sulfide resin. Electromagnetic contactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3003624A JP2640576B2 (en) | 1991-01-17 | 1991-01-17 | Electromagnetic contactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3003624A JP2640576B2 (en) | 1991-01-17 | 1991-01-17 | Electromagnetic contactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04242034A JPH04242034A (en) | 1992-08-28 |
| JP2640576B2 true JP2640576B2 (en) | 1997-08-13 |
Family
ID=11562652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3003624A Expired - Lifetime JP2640576B2 (en) | 1991-01-17 | 1991-01-17 | Electromagnetic contactor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2640576B2 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4970178A (en) * | 1972-11-09 | 1974-07-06 | ||
| JPS57117019U (en) * | 1981-01-13 | 1982-07-20 | ||
| JPS59132139U (en) * | 1983-02-22 | 1984-09-04 | 神鋼電機株式会社 | Auxiliary contact structure of magnetic contactor |
| JPS6242509A (en) * | 1985-08-20 | 1987-02-24 | 松下電器産業株式会社 | Manufacture of solid electrolytic capacitor |
-
1991
- 1991-01-17 JP JP3003624A patent/JP2640576B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04242034A (en) | 1992-08-28 |
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