201025373 六、發明說明： 【發明所屬之技術領域】 本發明係有關於例如對降壓馬達（m〇t〇〇斑 善用電容器等電力機械進行開關控制的電磁接Γ觸與功率改 關於進行主接點之開關操作的電磁吸鐵° ’尤其 【先前技術】 agnet)部。 電磁接觸器係利用電磁吸鐵之吸引力而 通或斷路。已知以往有如第5圖所示之電磁接觸=接點導 具有由鐵心3卜捲繞該鐵心31的線圈（c〇il) & 其係 (yoke) 33所構成的電磁吸鐵34，一旦線 以及軛 可動鐵板35被吸引，裝設有可動鐵板的旋轉輛％確，則 支持板37則與此連動而朝上方轉動，連結於支6會轉動， 閥（valve) 38之動作桿（rod)係朝上方移動 的真空 空閥38的主接點即導通。若解除線圈32之激磁内建於真 未圖示的彈簧構件使旋轉軸36朝逆時斜 ，則藉由 主接點斷路(break)。 °轉動’即可使 在電磁吸鐵34之鐵心31部與可動鐵板^ 係設有遮磁板39。該遮磁板39係用以減少礤^間之隙縫 而防止因殘留磁性所致之誤動作者，其實質 之剖面積 的作用。於第5圖時，由可撓性構件所構有發揮空隙 係被墊圈夾持而螺栓鎖固於鐵心31(參照專利的遮磁板39 專利文獻1:曰本實開昭 4頁、第1圖） m (第2至 【發明内容】 320997 4 201025373 (發明所欲解決之課題） ' 電磁吸鐵之吸引力係依據可動子（可動鐵板）輿輕（或 鐵心）間之接觸部的空隙而大幅變化《可動子與軛（或鐵 心）係當每次成為主接點導通狀態時即碰撞，接觸部的狀 態會因碰撞次數而變化’因此，吸引力會因電磁吸鐵之開 關次數而大幅變化。為此’較佳為當於空隙插入遮磁板時， 以不致鬆脫之方式牢固地安裝，而使因開關時之衝擊所致 的尺寸變化較少，另外，當因反覆地碰撞而使遮磁板磨耗 P 或劣化時也可容易地替換。 使用了專利文獻1所示之電磁吸鐵的電磁接觸器中， 由於係以螺栓將遮磁板固定於鐵心，故存在有可能因反覆 之衝擊使螺栓鬆脫之問題點。另外，在更換零件必須將螺 栓拆下才能進行，因此也有更換零件費工夫的問題。更且， 由於成為磁極頭的墊圈部露出，故有易於附著異物或粉塵 的問題。 Φ 本發明係為了消除上述問題點而研發者，其目的為提 供一種電磁接觸器，其具有耐反覆之衝擊、於磁極部不易 附著異物或粉塵，且易於安裝的遮磁板。 (解決課題的手段） 本發明之電磁接觸器係具有：電磁吸鐵；可動子，由 前述電磁吸鐵之激磁所驅動；以及真空閥，内建有與前述 可動子之驅動連動而被驅動、接離的一對主接點；其中’ 前述電磁吸鐵係具有：電磁線圈’捲繞於兩端具有凸緣部 之繞線管（bobbin);鐵心，插通前述繞線管且於一端侧形 5 * . · 320997 201025373 成有與前述可動子相對向之磁極頭；以及軛，以固著於前 述鐵心之另一端侧且環繞前述電磁線圈之側部的方式設 置，而且，於前述磁極頭側之前述繞線管的前述凸緣部， 係以覆蓋前述磁極頭的方式設有遮磁板。 (發明之效果） 依據本發明之電磁接觸器，在驅動主接點的電磁吸 鐵，係於磁極頭侧之繞線管的凸緣部以覆蓋磁極頭之方式 設置有遮磁板，故磁極頭部整體係以無露出部的方式由較 大的遮磁板所覆蓋，故受到反覆之衝擊的變形和磨耗較 少，且可抑制金屬異物或粉塵等浸入、附著於磁極頭部， 因此可獲得可靠性高的電磁接觸器。 【實施方式】 第一實施形態 以下，係依據圖式說明第一實施形態之電磁 。 首先’依據第1圖說明整體之構成。内建有由固定接 點la和可動接點lb所構成之主接點的真空閥ι係於 框體2之内侧收容有3相份。固定接點la係連接於固定尸 lc，固定桿1c係被導出至真空閥1之容器的外部而連接J 固定侧端子3 ’並且固定於絕緣框體2。另-方面，可動接 點lb係連接於可在接點之接離方向上移動的可動 可動桿Μ係被導出至外部而經由可撓導體4而連接：可動 側端子5’且可動桿ld係與位於同抽上之絕緣桿 連結。絕緣桿6之另—相經由對兩接關施加慶 的接壓彈簧7而連接於開_ 8之—端接觸慶力 320997 6 201025373 • 開關柄8之另一端係固著於轉動軸9，藉由以轉動軸 ； 9之軸心為支點進行轉動，經由接壓彈簧7而使絕緣桿6 及與該絕緣桿6連結的可動桿Id朝兩接點la、lb之接離 方向往復運動。該轉動轴9係如第1圖（b)所示，在固著 於基座10之絕緣框體2的兩側面經由轴承11而可自由轉 動地被支持。 更且，於轉動軸9係固著有與開關桿8連動而轉動的 可動子12。而且，以電磁力吸引可動子12，使轉動軸9 _ 朝使接點導通（閉合）的方向轉動的電磁吸鐵13係配設於與 可動子12相對向的基座10。有關電磁吸鐵13、及電磁吸 鐵13與可動子12間之抵接部附近的詳細將於後述。 更且，於轉動轴9係設有如第1圖（b)所示的接點 開放用桿14，與桿14相對向而配設有開放彈簧15。該開 放彈簧15係朝與可動子12之吸引方向相反的方向被彈 壓，藉由推壓桿14而使轉動軸9轉動，而發揮將主接點開 ❿放的作用。 以即使桿14被開放彈簧15推壓而使轉動轴9轉動也 不會轉動預定角度以上的方式，將止動器（stopper) 16設 於可動子12之吸引侧的相反側。 如上所述，電磁接觸器係藉由電磁吸鐵13之激磁而 驅動可動子12,且與可動子12之驅動連動而驅動真空閥1 之主接點的可動接點lb使其接離，藉此開關主接點la、 lb，但從真空閥1至轉動軸9為止的主電路部之構成僅為 一例，而非被限定於第1圖之形狀者。 7 320997 201025373 接著’對於雷磁而 據第ϊ圖U) ^ 鐵13與可動子12附近的詳細，依 如第1圖（a)°面圖和第2圖、及第3團進行說明。 電磁線圈18,捲之剖面圖所示，電磁吸鐵13係構成為： 之軀幹部；圓桂妝於在兩端具有凸緣部17a的繞線管17 於一端侧形成有/鐵心19 ’插通繞線管17之躺幹部而 2〇 (亦可參照第^可動子12相對向的磁極頭19a;以及軛 固等而固著，且圖），於鐵心19之另一端侧藉由螺栓鎖 2〇係於下部側二繞電磁線圈18之側部的方式設置。輛 座10。 叹置的安裝腳2〇a被螺栓鎖固而固定於基 於鐵心19夕讲化 、 <趙極頭19a側係配設有用以吸引可動子 真空閥1之主接點之導通狀態的永久磁鐵21。永 1之大小係與鐵心19之外徑大致相同。 如第2圖爲墙、 一 ^ 久弟3圖所示’於鐵心19之磁極頭19a側 的繞線s 17之凸緣部17&係以可自由裝卸之方式設有覆蓋 /極頭他之大小的遮磁板22。在設有永久磁鐵21的情 形時則田」為可覆蓋永久磁鐵21的大小。遮磁板22係 為了使吸引力穩定化而設者，其作用之詳細將於後述。 遮磁板22例如係使用由黃銅或磷青銅所構成的矩形 狀薄板其厚度例如為〇26mm，寬度為可隱藏如上所述 的磁極頭19a (或永久磁鐵21)的尺寸，於相對向的兩邊 側係形成有折曲成直角的折曲面22^且於各折曲面22a 係形成有矩形狀之安裝孔22b。 另方面，於繞線管17之磁極頭19a側的凸緣部17a 320997 201025373 . 之上下係形成有扣合於安裝孔22b的突起部nb。上下之 . 突起部17b之外侧端面間的尺寸係設定為比遮磁板之折 曲面22a間之尺寸略長。 遮磁板22之女裝係如第3圖所示，使一方突起部1几 扣合於折曲面22a之一方安裝孔22b，並將另一方如箭麥 所示予以壓入’利用折曲面22a之彈性，將另一方之突^ 部17b插入另一方之安裝孔22b而使其扣合。，扣合後的狀 態為第2圖。 如上所述所構成的電磁吸鐵13、遮磁板22、與可動 子12之間的關係’係為當可動子12被磁極頭吸引時， 可動子12之與磁極頭19a相對向的面係大致齊平地與遮磁 板22之面相對向而使彼此之配置關係成為無隙縫的方式。 當可動子12被吸引時’雖可動子12之面亦可直接抵 接於遮磁板22，但抵接於輛20之開口磁極頭19&侧 ❹ 之端面的方式’即使在長期間的使用下與磁極頭19&之平 行度也不易產生偏差。 接著，對於電磁接觸器之動作進行說8月。當真空閣 2點斷路時，可動子12係被開放彈簧15推壓而成為 接止動器16的狀態。若對電磁接觸器通 會被激磁，產生環繞㈣出 =通’而於電磁吸鐵13產生吸引力。藉由該吸引力 I 12係破吸引至磁極頭⑽侧，且以轉動軸9為支 =圖中朝秦時鐘方向轉動。與其連動地，開關桿 係經由接壓彈簧7而將絕緣桿6與可動桿㈣ 320997 9 201025373 閥1之可動接點lb係抵接於固定接點la。更且，接壓彈 簧7係被壓縮而成為如第1圖所示的狀態而完成導通。兩 .. 接點1 a、lb係藉由接壓彈簧7之接壓力而對接點施加必要 的接觸壓。當導通結束後，可動子12係被永久磁鐵21之 吸引力吸引而保持導通狀態。 遮斷動作係藉由遮斷指令而使電磁線圈19導通且朝 反方向被激磁時’勝過永久磁鐵21之吸引力的反彈力會作 用於可動子12，藉由接壓彈簧7之力、和開放彈箐15推 壓桿14之力’轉動軸9會於第1圖朝逆時鐘方向轉動，而 擎 將開關桿8推下，使其成為可動接點lb遠離固定接點la 的遮斷狀態。此時’可動子12係抵接於止動器16而使其 不會過度轉動。 接著，針對遮蔽板22之作用進行說明。 一般而言，本實施形態之電磁接觸器係作為電力機器 之開關（switch)而使用者，從而開關數十萬次。可動子 12、與鐵心19之磁極頭19a (設有永久磁鐵21之情形時 則為永久磁鐵21)’係難以使隙缝完全為0’而會存在有若 ® 干之微小隙缝。該隙縫右因如上所述多數次之重複動作而 變化，則電磁力也會變化，視變化之程度有時會對開關造 成阻礙。 第4圖為顯示電磁吸鐵之磁性電路中之可動子部的空 隙與電磁力之關係的示意圖。例如，若初期空隙為〇 2mm 者因長期間之開關動作而使抵接部表面因磨耗等而減少至 0.1mm，則電磁力僅變化AFi。若初期值為〇.5mm者減少 320997 10 201025373 至〇.4賴，則電磁例會變化達Δρ2。可知雖空隙之減少晋 同樣為0.1mm，但電磁力變化量為Δ；π>Δ;ρ2，且 空隙而會有很大之差異。從而，為了使㈣力之_ = 少，係以初期空隙較大者為佳，但若空隙變大 磁 力會降低' 、、、电磁 ❹ 因此，遮磁板22係使甩非磁性構件（非透磁性材料）， 預先於可動子12、和鐵心19之磁極頭19a (或永久磁鐵 21)之間設定使電磁力不太會降低之值的磁性隙縫。藉由 遮磁板22之厚度，可動子12與磁極頭⑼（或永久磁鐵 21)之磁性縫隙係大致保持—$，即使藉由多次的重複開 關動作而因磨耗等使其尺寸略為減少，也可將電磁力之二 化量抑制為較小。成為該隙縫的遮磁板22之厚度 所說明般例如為0.26mm左右。 ” 料’遮磁板22係如前所述因多次之關而被施加 衝擊，因此無法避免因長年使用而產生磨耗或變形，故為 ❹了維持穩定的性能，期望能夠定期地更換。於本實施形態 中，由於將遮磁板22作成為可自由裝卸之構造，故更換遮 磁板22時’能夠以與第3圖之安裝順序相反的順序簡單地 拆下’而不需要螺栓等固定零件，也不需要使用工具等即 可輕易地更換新品。 更X，由於永久磁鐵21之外徑係與磁極頭19a之外 徑大致相同’雖嵌合於繞線管Π之軀幹部内徑，但當然在 組裝上仍需要若干空隙’因此在組裝後會存在些微空隙。 而會有於該空隙和永久磁鐵21之表面附著金屬異物或粉 320997 11 201025373 空隙」便會 塵等之虞。若金屬異物和粉塵等附著，前述 產生變化。 於本實施形態卜將遮磁板22之大小設為可 久磁鐵21(s磁極頭19a)之外徑的大小， μ水 :=遮ΓΓ所覆蓋的形式’而可抑制金屬異 塵專附者。另外，因遮磁板22係覆蓋寬廣面，故： 性良好，也難以產生磨耗或變形。 /、、衝擊201025373 VI. Description of the Invention: [Technical Field to Which the Invention Is Alonged] The present invention relates to, for example, an electromagnetic contact and power modification of a step-down motor (m〇t 〇〇 善 善 善 电力 电力 电力 电力 电力 电力 电力 电力Electromagnetic suction of the switch operation of the contact ° 'particularly [previous technology] agnet). Electromagnetic contactors use the attraction of electromagnetic iron to open or break. It is known that the electromagnetic contact = the contact point shown in Fig. 5 has an electromagnetic attraction wire 34 composed of a coil (c〇il) & yoke 33 which is wound by the core 3; When the wire and the yoke movable iron plate 35 are sucked, and the rotation of the movable iron plate is confirmed, the support plate 37 is rotated upward in conjunction with this, and the branch 6 is rotated, and the valve of the valve 38 is actuated. (rod) The main contact of the vacuum valve 38 that moves upward is turned on. When the spring member of the unwinding coil 32 is built in a spring member (not shown), the rotating shaft 36 is tilted in the reverse direction, and the main contact is broken. The "rotation" allows the magnetic core 31 of the electromagnetic iron 34 to be coupled to the movable iron plate to be provided with a magnetic shielding plate 39. The shimming plate 39 is used to reduce the gap between the ridges and prevent the erroneous movement of the author due to residual magnetism, and its substantial sectional area. In the fifth embodiment, the flexible member is configured such that the gap is held by the washer and the bolt is locked to the core 31. (Refer to the patented magnetic shielding plate 39. Patent Document 1: 曰本实开昭4页, 1 Fig.) m (2nd to [Summary of the Invention] 320997 4 201025373 (Problems to be Solved by the Invention) 'The attraction of the electromagnetic attraction is based on the gap between the contact portion between the movable member (movable iron plate) and the light (or core) The change is that the movable yoke and the yoke (or the iron core) collide each time the main contact is turned on, and the state of the contact portion changes depending on the number of collisions. Therefore, the attractive force is due to the number of times the electromagnetic iron is switched. Greatly change. For this reason, it is preferable to firmly install the magnetic shielding plate when it is inserted into the gap, so that the dimensional change due to the impact of the switch is less, and when it collides due to the reverse In the electromagnetic contactor using the electromagnetic iron shown in Patent Document 1, since the electromagnetic shielding device of the electromagnetic iron shown in Patent Document 1 is used, since the magnetic shielding plate is fixed to the iron core by a bolt, there is a possibility that it may be caused by Repeated impact makes the bolt loose In addition, since it is necessary to remove the bolts in order to replace the parts, there is a problem that it takes time to replace the parts. Moreover, since the gasket portion which becomes the magnetic pole head is exposed, there is a problem that foreign matter or dust is easily adhered. In order to solve the above problems, the object of the present invention is to provide an electromagnetic contactor which has a shock-resistant plate which is resistant to repeated impact, which is less likely to adhere to foreign matter or dust at the magnetic pole portion, and which is easy to mount. The electromagnetic contactor of the invention has: an electromagnetic iron; a movable member driven by the excitation of the electromagnetic iron; and a vacuum valve having a pair of main connections driven and disconnected in conjunction with the driving of the movable member; The magnetic electromagnetic system has a bobbin having a flange portion at both ends, and a core, which is inserted into the bobbin and has a shape on one end side. 5 * . 320997 201025373 a magnetic pole head opposite to the movable body; and a yoke provided to be fixed to the other end side of the iron core and surrounding the side portion of the electromagnetic coil, Further, the flange portion of the bobbin on the magnetic pole head side is provided with a magnetic shielding plate so as to cover the magnetic pole head. (Effect of the Invention) According to the electromagnetic contactor of the present invention, the main contact is driven In the electromagnetic iron, the flange portion of the bobbin on the side of the magnetic pole head is provided with a magnetic shielding plate so as to cover the magnetic pole head, so that the entire magnetic pole head is provided by a large shielding plate in such a manner that there is no exposed portion. Since it is covered, it is less likely to be deformed and worn by the impact of the reverse, and it is possible to suppress intrusion and adhesion of metal foreign matter or dust to the magnetic pole head. Therefore, a highly reliable electromagnetic contactor can be obtained. The electromagnetic system of the first embodiment will be described with reference to the drawings. First, the overall configuration will be described based on Fig. 1. A vacuum valve ι having a main contact formed by a fixed contact la and a movable contact 1b is built in the frame. The inside of the body 2 houses three phases. The fixed contact la is connected to the fixed body lc, and the fixed rod 1c is led out to the outside of the container of the vacuum valve 1 to be connected to the J fixed side terminal 3' and fixed to the insulating frame 2. On the other hand, the movable contact 1b is connected to the movable movable lever which is movable in the direction in which the contact is removed, and is led to the outside and connected via the flexible conductor 4: the movable side terminal 5' and the movable lever ld It is connected to the insulating rod located on the same pumping. The other phase of the insulating rod 6 is connected to the opening _ 8 by the pressing spring 7 which applies the clearing to the two contacts. The end contact is 3.2997 6 201025373. The other end of the switch handle 8 is fixed to the rotating shaft 9, Rotation is performed by the pivot shaft 9 as a fulcrum, and the insulating rod 6 and the movable rod Id coupled to the insulating rod 6 are reciprocated in the direction in which the two contacts la and lb are separated from each other via the pressure receiving spring 7. As shown in Fig. 1(b), the rotating shaft 9 is rotatably supported by bearings 11 on both side faces of the insulating housing 2 fixed to the base 10. Further, a movable member 12 that rotates in conjunction with the switch lever 8 is fixed to the rotating shaft 9. Further, the movable iron 12 is attracted by the electromagnetic force, and the electromagnetic iron 13 that rotates the rotating shaft 9_ in the direction in which the contact is turned on (closed) is disposed on the susceptor 10 facing the movable member 12. The details of the vicinity of the electromagnetic attraction wire 13 and the abutting portion between the electromagnetic iron 13 and the movable member 12 will be described later. Further, a contact opening lever 14 as shown in Fig. 1(b) is provided on the rotating shaft 9, and an open spring 15 is disposed to face the rod 14. The opening spring 15 is biased in a direction opposite to the suction direction of the movable member 12, and the rotating shaft 9 is rotated by the pressing lever 14, thereby exerting a function of opening and closing the main contact. The stopper 16 is provided on the opposite side of the suction side of the movable member 12 so that the rotation of the rotary shaft 9 is prevented from being rotated by a predetermined angle or more even if the lever 14 is pressed by the open spring 15. As described above, the electromagnetic contactor drives the movable member 12 by the excitation of the electromagnetic iron 13, and drives the movable contact 1b of the main contact of the vacuum valve 1 in conjunction with the driving of the movable member 12 to be separated. The main contacts 1a and 1b of the switch are provided, but the configuration of the main circuit portion from the vacuum valve 1 to the rotating shaft 9 is merely an example, and is not limited to the shape of Fig. 1. 7 320997 201025373 Next, 'for the magnetic field, according to the figure U) ^ The details of the vicinity of the iron 13 and the movable member 12 are as shown in Fig. 1 (a), the surface view, the second figure, and the third group. In the electromagnetic coil 18, as shown in the cross-sectional view of the winding, the electromagnetic iron 13 is configured as a trunk portion; the bobbin is formed on the one end side of the bobbin 17 having the flange portion 17a at both ends. Passing through the trunk portion of the bobbin 17 and 2 〇 (may also refer to the magnetic pole head 19a facing the movable member 12; and fixing the yoke or the like, and Fig.), and the other end side of the core 19 is locked by a bolt 2〇 is provided in such a manner that the lower side is wound around the side of the electromagnetic coil 18. Block 10. The mounting leg 2〇a of the sigh is fixed by bolts and fixed to the iron core 19, and the permanent magnet of the main contact of the movable vacuum valve 1 is disposed on the side of the Zhao pole head 19a. twenty one. The size of the permanent 1 is substantially the same as the outer diameter of the core 19. As shown in Fig. 2, the flange portion 17& of the winding s 17 on the side of the magnetic pole 19a of the core 19 is shown in Fig. 2, and is provided with a cover/pole for freely detachable. A size of the magnetic shielding plate 22. When the permanent magnet 21 is provided, the field is the size that can cover the permanent magnet 21. The magnetic shielding plate 22 is designed to stabilize the attraction force, and the details of its operation will be described later. The magnetic shielding plate 22 is, for example, a rectangular thin plate made of brass or phosphor bronze, and has a thickness of, for example, 〇26 mm, and has a width that can hide the size of the magnetic pole head 19a (or the permanent magnet 21) as described above, in the opposite direction. The both sides are formed with a folded curved surface 22 which is bent at a right angle, and a rectangular mounting hole 22b is formed in each of the folded curved surfaces 22a. On the other hand, the flange portion 17a 320997 201025373 on the side of the magnetic pole head 19a of the bobbin 17 is formed with a projection portion nb that is fastened to the mounting hole 22b. Up and down. The dimension between the outer end faces of the projections 17b is set to be slightly longer than the dimension between the folded curved surfaces 22a of the shielding plates. As shown in FIG. 3, the female body of the magnetic shielding plate 22 is fastened to one of the mounting holes 22b of one of the folded curved surfaces 22a, and the other side is pressed into the 'folded surface 22a' as shown by the arrow The elasticity is made, and the other protruding portion 17b is inserted into the other mounting hole 22b to be engaged. The state after the fastening is shown in Figure 2. The relationship between the electromagnetic iron 13, the magnetic shielding plate 22, and the movable member 12 configured as described above is such that when the movable member 12 is attracted by the magnetic pole head, the surface of the movable member 12 opposed to the magnetic pole head 19a is The arrangement of the shielding plates 22 is substantially flush with the surface of the shielding plate 22 so as to be seamless. When the movable member 12 is attracted, the surface of the movable member 12 can directly abut against the magnetic shielding plate 22, but the way of abutting against the end surface of the open magnetic pole head 19 & side of the vehicle 20 is used even in a long period of time. The parallelism with the magnetic pole head 19& is also less likely to cause a deviation. Next, the operation of the electromagnetic contactor is said to be August. When the vacuum chamber is opened at 2 o'clock, the movable member 12 is pressed by the open spring 15 to be in the state of being connected to the stopper 16. If the electromagnetic contactor is energized, a wrap around (four) out = on is generated and the electromagnetic attractor 13 is attracted. The attraction I 12 is drawn to the side of the magnetic pole head (10), and is rotated by the rotation axis 9 = in the direction of the clock in the clock. In conjunction with this, the switch lever abuts the movable contact 6 and the movable contact lb of the movable lever (four) 320997 9 201025373 valve 1 via the pressure contact spring 7 to the fixed contact la. Further, the pressure-receiving spring 7 is compressed to be in a state as shown in Fig. 1 to complete the conduction. The contact point 1 a, lb is the contact pressure applied to the contact by the pressure of the pressure spring 7 to apply the necessary contact pressure. When the conduction is completed, the movable member 12 is attracted by the attraction force of the permanent magnet 21 and is kept in an ON state. When the blocking operation is performed by the blocking command to cause the electromagnetic coil 19 to be turned on and excited in the opposite direction, the rebounding force that exceeds the attraction force of the permanent magnet 21 acts on the movable member 12, by the force of the pressing spring 7, And the force of the open magazine 15 pushing the lever 14 'the rotating shaft 9 will rotate in the counterclockwise direction in the first figure, and the engine pushes the switch lever 8 down, making it the occlusion of the movable contact lb away from the fixed contact la status. At this time, the movable member 12 abuts against the stopper 16 so as not to excessively rotate. Next, the action of the shielding plate 22 will be described. In general, the electromagnetic contactor of the present embodiment is used as a switch of an electric machine, and is thus switched hundreds of thousands of times. The movable member 12 and the magnetic pole 19a of the core 19 (the permanent magnet 21 in the case where the permanent magnet 21 is provided) are difficult to make the slit completely 0', and there is a small slit which is dry. When the right side of the slit changes due to the repeated operation as described above, the electromagnetic force also changes, and the degree of change may hinder the switch. Fig. 4 is a view showing the relationship between the gap of the movable sub-portion and the electromagnetic force in the magnetic circuit of the electromagnetic iron. For example, when the initial gap is 〇 2 mm, the surface of the contact portion is reduced to 0.1 mm due to abrasion or the like due to the switching operation for a long period of time, and the electromagnetic force changes only AFi. If the initial value is 〇.5mm, reduce 320997 10 201025373 to 〇.4 赖, the electromagnetic case will change by Δρ2. It can be seen that although the reduction of the void is also 0.1 mm, the amount of change in the electromagnetic force is Δ; π >Δ; ρ2, and the gap is greatly different. Therefore, in order to make the (4) force _ = less, it is preferable that the initial gap is larger. However, if the gap becomes large, the magnetic force is lowered, and the electromagnetic shielding is performed. Therefore, the shielding plate 22 is made of a non-magnetic member. The magnetic material) is a magnetic gap that is set in advance between the movable member 12 and the magnetic pole head 19a (or the permanent magnet 21) of the core 19 so that the electromagnetic force is less likely to decrease. By the thickness of the shielding plate 22, the magnetic gap between the movable member 12 and the magnetic pole head (9) (or the permanent magnet 21) is substantially maintained at -$, and the size is slightly reduced by abrasion or the like even by repeated switching operations. It is also possible to suppress the amount of electromagnetic force to be small. The thickness of the magnetic shielding plate 22 which becomes the slit is, for example, about 0.26 mm. Since the material "magnetic shielding plate 22" is subjected to an impact due to a plurality of times as described above, abrasion or deformation due to long-term use cannot be avoided, so that it is desired to be periodically replaced in order to maintain stable performance. In the present embodiment, since the shielding plate 22 is detachably attached, the magnetic shielding plate 22 can be easily removed in the reverse order of the mounting order of Fig. 3 without the need for fixing by bolts or the like. The part can be easily replaced with a new tool without using a tool, etc. Further, since the outer diameter of the permanent magnet 21 is substantially the same as the outer diameter of the magnetic pole head 19a, the inner diameter of the trunk portion of the bobbin is fitted, but Of course, a number of voids are still required for assembly. Therefore, some micro-voids may exist after assembly. There may be metal foreign matter or powder on the surface of the gap and the permanent magnet 21, and the gap may be dusty. If metal foreign matter and dust adhere to each other, the above changes. In the present embodiment, the size of the magnetic shielding plate 22 is set to the outer diameter of the permanent magnet 21 (s magnetic pole head 19a), and μ water: = the form covered by the concealer, and the metal dust exclusive attachment can be suppressed. . Further, since the magnetic shielding plate 22 covers a wide surface, it is excellent in properties and wear and deformation are hard to occur. /,, shock
又，至前述為止的說明中，雖作為導通動作保 使用永久磁鐵2卜但亦有於導通後持續對電磁線圈^ 動電流而保持導通狀態或利用閂鎖機構保持導通狀熊的^ 式’於此情形中，即不需要永久磁鐵21。雖由於沒有永久 磁鐵21而可減少金屬異物之附著’但磁極頭1%與可動子 12之空隙間的關係係與上述相等’相對於異物之浸入和粉 塵對於表面的附著也可期待同樣的作用效果。Further, in the above description, although the permanent magnet 2 is used as the conduction operation, it is also possible to continue to maintain the conduction state of the electromagnetic coil after the conduction, or to maintain the conduction-type bear by the latch mechanism. In this case, the permanent magnet 21 is not required. Although there is no permanent magnet 21, the adhesion of metal foreign matter can be reduced. However, the relationship between the magnetic pole head 1% and the gap of the movable member 12 is equal to the above. The same effect can be expected with respect to the infiltration of foreign matter and the adhesion of dust to the surface. effect.
如上所述，依據第一實施形態之電磁接觸器，驅動主 接點的電磁吸鐵係具有：電磁線圈’捲繞於兩端具有凸緣 部的繞線管；鐵心’插通繞線管’且於一端侧形成有與可 動子相對向之磁極頭；以及軛，以圍繞被固定於鐵心之另 一端侧的電磁線圈之侧部的方式設置；其中，藉由於磁極 頭侧之繞線管的凸緣部以覆蓋磁極頭的方式設置遮磁板， 因此藉由作成為幾乎覆蓋繞線管之凸緣部的大面積遮磁 板’即可減少因反覆之衝擊所致的變形或磨耗，另外，也 可抑制於繞線管和鐵心之空隙間或磁極頭附著有金屬異物 或粉塵等。 12 320997 201025373 另外’遮磁板係由矩形狀之板材所構成，且於形成在 .‘ 相對向之兩側的折曲面設有安裝孔，使安裝孔扣合在設於 繞線管之凸緣部的突起部，且以可自由拆裝之方式安裝， 因此不使用固定構件或工具等也可輕易地拆裝遮磁板，且 可提供一種不會因開關振動而導致遮磁板脫落、可靠性高 • 的電磁接觸器。 更且’於磁極頭和遮磁板之間’由於設有用以保持主 接點之導通狀態的永久磁鐵，故為不另外需要保持導通甩 •之閂鎮機構的構成’藉此可提供_種可抑制於永久磁鐵部 附著金屬異物，且可靠性高的電磁接觸器。 【圖式簡單說明】 第1圖為表示本發明第一實施形態之電磁接觸器構成 的圖，（a)為侧面側剖面，（b)為從（a)之箭號b觀看之 電磁吸鐵部之局部正面圖。 第2圖為第1圖之電磁吸鐵部之斜視圖。 φ 第3圖為說明第1圖之電磁吸鐵之電磁線爾之遮磁板 安裝方法的斜視圖。 第4圖為表示可動子與磁極頭間之間隙與電磁力之關 係的圖。_ 第5圖為表示習知電磁接觸 【主要元件符號說明】 器之構成的圖。 1 真空閥 la 固定接點 lb 可動接點 lc 固定桿 Id 可動桿 2 絕緣框體 320997 13 201025373As described above, according to the electromagnetic contactor of the first embodiment, the electromagnetic iron which drives the main contact has: the electromagnetic coil 'wound around the bobbin having the flange portion at both ends; the core 'inserted bobbin' And a magnetic pole head opposite to the movable body is formed on one end side; and a yoke is disposed to surround the side of the electromagnetic coil fixed to the other end side of the iron core; wherein, by the bobbin of the magnetic pole head side The flange portion is provided with a magnetic shielding plate so as to cover the magnetic pole head, so that deformation or wear due to the impact of the reverse can be reduced by making a large-area shielding plate that covers almost the flange portion of the bobbin. It is also possible to suppress metal foreign matter or dust from adhering to the gap between the bobbin and the core or the magnetic pole head. 12 320997 201025373 In addition, the 'shield plate is made up of rectangular plates, and the mounting holes are formed on the curved surfaces formed on the opposite sides of the '' opposite sides, so that the mounting holes are fastened to the flanges provided on the bobbins The protruding portion of the portion is detachably mounted, so that the magnetic shielding plate can be easily attached and detached without using a fixing member or a tool, and the shielding plate can be prevented from falling off due to switching vibration. High magnetic contactor. Further, 'between the magnetic pole head and the damper plate' is provided with a permanent magnet for maintaining the conduction state of the main contact, so that it is not necessary to maintain the structure of the latching mechanism of the conduction '. An electromagnetic contactor that can suppress the adhesion of metal foreign matter to the permanent magnet portion and has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the configuration of an electromagnetic contactor according to a first embodiment of the present invention, wherein (a) is a side surface side cross section, and (b) is an electromagnetic iron rod viewed from arrow (b) of (a). Partial front view of the department. Fig. 2 is a perspective view of the electromagnetic iron absorbing portion of Fig. 1. φ Fig. 3 is a perspective view showing a mounting method of the electromagnetic shielding plate of the electromagnetic wire of the electromagnetic iron of Fig. 1. Fig. 4 is a view showing the relationship between the gap between the movable member and the magnetic pole head and the electromagnetic force. _ Fig. 5 is a view showing a conventional electromagnetic contact [Description of main component symbols]. 1 Vacuum valve la Fixed contact lb Movable contact lc Fixed rod Id Movable rod 2 Insulated frame 320997 13 201025373
3 固定侧端子 4 可撓導體 5 可動侧端子 6 絕緣桿 7 接壓彈簧 8 _開關柄 9 轉動軸 10 基座 11 輛承 12 可動子 13 電磁吸鐵 14 桿 15 開放彈簧 16 止動器 17 繞線管 17a 凸緣部 17b 突起部 18 電磁線圈 19 鐵心 19a 磁極頭 20 輛 20a 裝置角 21 永久磁鐵 22 遮磁板 22a 折曲面 22b 安裝孔 320997 ❹3 Fixed side terminal 4 Flexible conductor 5 Movable side terminal 6 Insulated rod 7 Pressure spring 8 _ Switch handle 9 Rotary shaft 10 Base 11 Bearing 12 Movable 13 Electromagnetic iron 14 Rod 15 Open spring 16 Stop 17 Winding Wire tube 17a Flange portion 17b Projection portion 18 Electromagnetic coil 19 Core 19a Magnetic pole head 20 Vehicle 20a Device angle 21 Permanent magnet 22 Magnetic shielding plate 22a Folded curved surface 22b Mounting hole 320997 ❹