Abstract:
The object of the present invention is to provide a reliability-improved operation device, vacuum opening/closing device, and method for assembling an operation device. In order to attain the above-mentioned object, the operation device includes an electromagnet  40  generating operation power, a movable rod capable of being moved by the operation power generated from the electromagnet  40,  a support member having a stopper member stopping the movement of the movable rod, a condenser  11  supplying electric current to the electromagnet  40,  a control board  10,  and a casing  1  housing the electromagnet  40,  the support member, the condenser  11,  and the control board  10  therein, the support member being fixed to a surface in the casing  1  which is different from surfaces of the casing onto which the condenser  11  and the control board  10  are fixed.

Description:
TECHNICAL FIELD 
       [0001]    The present invention relates to an operation device, vacuum opening/closing device, and method for assembling an operation device and, more particularly, to installation of an electromagnet into an operation device. 
       BACKGROUND ART 
       [0002]    As an operation device of an electromagnetic operation-type for an opening/closing device, there is an operation device disclosed in Patent Literature 1, for example. The operation device disclosed in the Patent Literature 1 includes an electromagnet arranged in a casing and generating operation power, a movable rod supported between a casing-bottom surface of the casing and the electromagnet, a condenser arranged on the casing-bottom surface of the casing for an electromagnet power source, a control board fixed to a lateral surface of the casing, etc. By the operation power from the operation device, a main contact is closing-operated or opening-operated. 
         [0003]    In the Patent Literature 1, the electromagnet, together with a break spring, is fixed to a casing-bottom surface and, by causing the rod penetrating a center of the electromagnet to be vertically moved, the main contact of a breaker section is closed or opened. The vertical movement of the rod is stopped by a shock absorber installed on the casing-bottom surface, or a stopper. 
       CITATION LIST 
     Patent Literature 
       [0004]    Patent Literature 1: Japanese Patent Application Laid-Open No. 2004-152625 
       SUMMARY OF INVENTION 
     Technical Problem 
       [0005]    According to the Patent Literature 1, the stopper of the vertically moving rod is present on the casing-bottom surface at the time of the closing-operation or opening-operation of the main contact, whereby shock is transmitted directly to the casing-bottom surface, so that vibration is easy to be applied to the condenser that is also installed on the casing-bottom surface. Therefore, the use of the operation device for a long time causes, for example, looseness of a wiring of the condenser or the like to occur, so that there is a room for more improving reliability. Moreover, the electromagnet and the stopper are connected at the time of assembling an entire operation device and the assembling work is carried out in the casing whose space is limited, so that the work is made complicated. 
         [0006]    Therefore, the object of the present invention is to provide a reliability-improved operation device and vacuum opening/closing device. 
         [0007]    Moreover, the object of the present invention is to provide a method for assembling an operation device, which can simplify work progresses. 
       Solution to Problem 
       [0008]    In order to solve the problem, the operation device according to the present invention includes an electromagnet generating operation power, a movable rod capable of being moved by the operation power generated from the electromagnet, a support member having a stopper member stopping the movement of the movable rod, a condenser supplying electric current to the electromagnet, a control board, and a casing housing the electromagnet, the support member, the condenser, and the control board therein, the support member being fixed to a surface in the casing which is different from surfaces onto which the condenser and the control board are fixed. 
         [0009]    The method for assembling an operation device according to the present invention, the operation device comprising an electromagnet generating operation power, a movable rod capable of being moved by the operation power from the electromagnet, a support member having a stopper member stopping the movement of the movable rod, a condenser supplying electric current to the electromagnet, a control board, and a casing housing the electromagnet, the support member, the condenser, and the control board therein, includes the steps of integrally forming the electromagnet with the support member and fixing the integrally formed electromagnet and support member to the casing. 
       Advantageous Effects of Invention 
       [0010]    According to the present invention, it is possible to provide a reliability-improved operation device, vacuum opening/closing device, and method for assembling an operation device. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0011]      FIG. 1  is a rear view of a vacuum opening/closing device according to an embodiment; 
           [0012]      FIG. 2  is a side sectional view of the vacuum opening/closing device according to the embodiment; 
           [0013]      FIG. 3  is an enlarged view of a neighborhood of a stopper according to the embodiment; and 
           [0014]      FIG. 4  is a top sectional view of the vacuum opening/closing device according to the embodiment. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0015]    An embodiment of the present invention will be explained hereinafter with reference to the drawings. Incidentally, the following description is absolutely made for the embodiment and has no intent to limit the contents of the present invention to the below-mentioned embodiment. The present invention itself can be embodied in various modifications other than the following embodiment. 
       Embodiment 
       [0016]    Referring to  FIGS. 1 to 4 , the embodiment is explained.  FIG. 1  is a configuration view of an operation device when a casing interior is viewed from a casing front.  FIG. 2  is a center sectional view of  FIG. 1 . 
         [0017]    In the interior of a casing  1 , an electromagnet  40  arranged at a center of the interior of the casing  1 , a condenser  11  supplying electric current to the electromagnet  40  and arranged on a bottom surface  21  of the casing and on the side of a lateral surface of the interior of the casing  1 , and a control board  10  fixed via a vibration-proofing member  24  to a lateral surface  20  of the casing, which is opposite to the lateral surface  20  of the casing, on which the condenser  11  is arranged, with respect to the electromagnet  40 , and controlling operation of the electromagnet  40  are housed. In the interior of the casing  1 , an auxiliary contact transmitting to an exterior a opening/closing status signal of a breaker section  100  operated by operation power generated from the electromagnet  40 , an indicator board indicating the opening/closing status signal, a counter counting the number of opening/closing operations, etc. (which are not shown) further housed. 
         [0018]    Referring to  FIGS. 1 and 2 , a structure of the electromagnet  40  is explained. The electromagnet  40  includes a rod  62  vertically penetrating centers of a support plate  174  and support plate  76 , a stationary iron core  60  supported on the support plate  174  and the support plate  76  and arranged around the movable rod  62 , a movable iron core  58  connected to the rod  62  on the stationary iron core  60 , a coil  48  arranged on outer peripheral sides of the stationary iron core  60  and movable iron core  58 , two movable planar plates  64 ,  66  arranged on an upper side of the movable iron core  58  and fixed to the movable iron core  58 , a support plate  74  arranged at an upper part of the coil  48  on the outer peripheral side of the movable iron core  58 , a permanent magnet  68  arranged between the support plate  74  and the movable planar plate  66 , a cover  70  connected to the support plate  74  and covering an outside of an upper portion of an electromagnet  40 , and a plate  56  connected to the cover  70  and serving as a lid for the upper part of the electromagnet  40 . On the outer peripheral side of the coil  48 , a side leg  72  is arranged. The coil  48  is housed in a coil bobbin  49  which is arranged between the support plate  74  and the support plate  76 . The rod  62  is arranged at a center portion of the electromagnet  40  and arranged along a vertical direction. Moreover, the rod  62  is inserted at an upper portion side thereof in a through-hole  82  of the plate  56  and inserted at a lower portion side thereof in a through-hole  84  of the support plate  76 , and is configured to be vertically movable and slidably movable. The movable iron core  58  and the movable planar plates  64 ,  66  are fixed to an outer peripheral surface of the rod  62  by using a nut. A shaft  32  is connected to the lower portion side of the rod  62  via a pin  33 . The rod  62  is connected at a portion thereof lower than the support plate  174  to the shaft  32  via the pin  33 . Moreover, the stationary iron core  60  is fixed onto the support plate  76  via a bolt. The two movable planar plates  64 ,  66  that are different in size are mounted to the rod  62 . This is because a distance between the upper movable planar plate  64  and the iron-made cover  70  which are opposed to each other is increased and leakage flux to the iron-made cover  70  is reduced. Moreover, a pressing plate  35  is connected to the lower portion side of the rod  62 . A ring-shaped break spring  42  that makes a circle around a shaft center of the rod  62  is mounted between the pressing plate  35  and a support plate  46 . This break spring  42  is adapted to give, via the pressing plate  35 , elastic force for separating the movable iron core  58  from the stationary iron core  60  to the rod  62 . Moreover, the permanent magnet  68  is arranged around the movable iron core  58  and fixed to the support plate  74 . The pressing plate  35  is connected to one end of the break spring  42 . The other end of the break spring  42  is connected to the support plate  46 . The pressing plate  35  acts together with the shaft, whereby the break spring  42  is operatively expanded and contracted, and accumulates or releases the elastic force. Moreover, the lower portion side of the shaft  32  is connected to a pair of levers  36  via a pin  31 . The levers  36  are configured as elements of a power transmission section playing a role in transmitting drive force, along with electromagnetic force generated from the electromagnet  40 , to a movable electrode and are connected to a lever  101  via a three-phase connecting shaft  30 . The lever  101  is connected to an insulating rod  114  via a pin  102 . The electromagnet  40  causes the rod  62  to be vertically moved by the electromagnetic force, whereby the insulating rod  114  (for three phases) that operates together with the rod  62  is vertically moved to turn on and turn off a main contact (not shown) that is present in an interior of the breaker section  100  (for three phases). The permanent magnet  68  attracts and holds the movable planar plate  64  at the time of turning off the main contact. 
         [0019]    The main contact is configured by a movable contact and a stationary contact and remained in insulating gas or vacuum in an insulating container interior. As shown in  FIG. 4 , this embodiment includes three vacuum valves for three phases, in an interior of each of which the main contact is housed. A wipe mechanism that applies contact pressure to the main contact is incorporated in an interior of the insulating rod  114 . The upper portion side of the insulating rod  114  is connected to a lower contactor  132  via a flexible conductor  121  and a feeder  122  and connected to the movable contact via a movable conductor  124 . The stationary contact that faces the movable contact is connected to an upper contactor  130  via the feeder  122 . A power cable such as a power line is connected to each contactor. 
         [0020]    In this embodiment, the electromagnet  40  is formed integrally with the support plate  46 , not contacting the casing  1  (arranged in a floating manner with respect to the casing  1 ), and a stationary rod  41  connecting the body of the electromagnet  40  and the support plate  46  and, thereafter, is fixed, via a mounting plate  43 , to a rear surface  22  of the casing by a bolt  45 . The support plate  46  supports a lower end of the break spring  42  arranged between the support plate  46  and the electromagnet  40 . Moreover, as shown in  FIG. 3 , a shock absorber  44  and a stopper  47  are supported by the lower side of the support plate  46 . The three-phase connecting shaft  30  has a lever  34  disposed more adjacent to the lateral surface side of the casing  1 , in addition to the levers  36  connected with the main contact. Although the lever  34  is rotated with the rotation of the three-phase connecting shaft  30 , the upward movement of the lever  34  is stopped by abutting of the lever  34  against the shock absorber  44  and the stopper  47 . The stopping of the lever  34  also stops the movement of other levers connected to the three-phase connecting shaft  30 . Thereby, it is possible to determine a stopping position. The break spring  42  causes the movable iron core  58  to be moved away from the stationary iron core  60  by the elastic force to thereby turn off the main contact. At this time, the shaft  32  is moved in an upward direction of a vertical direction and, in conjunction with this, the lever  34  connected to the three-phase connecting shaft  30  is also moved in the upward direction.  FIG. 3  illustrates an enlarged view of a neighborhood of the lever  34  as viewed from the casing-lateral surface. The shock absorber  44  and the stopper  47  are stopped by striking of the lever  34  against them, whereby the upward movement of the rod  62  and shaft  32  along with turning on of the main contact is stopped. 
         [0021]    Thanks to the presence of the shock absorber  44  and stopper  47 , a shock which is generated by kinetic energy, which a movable component such as the shaft  32 , etc. has, and elastic energy of the spring is transmitted to the support plate  46 . Incidentally, vibration generated due to this shock is not propagated directly to the casing-bottom surface  21  and is in turn propagated to the stationary rod  41 , the mounting plate  43  and the casing-rear surface  22  and, thereafter, arrives at the casing-lateral surfaces  20  and the casing-bottom surface  21 . Therefore, as compared to a case where the stopper is installed directly on the casing-bottom surface  21 , an influence of the vibration on the condenser installed on the casing-bottom surface  21  is reduced and probability of occurrence of a defect, for example, the looseness of the wiring, is reduced. Similarly, the influence of the vibration on the control board  10  installed on the casing-lateral surface  20  can be reduced and the probability of the occurrence of the defect can be reduced. 
         [0022]    The fixing manner of the electromagnet  40  to the casing  1  is explained with reference to  FIG. 4 .  FIG. 4  is a configuration view of an electromagnetic operation device when the casing interior is viewed from the casing-bottom surface. As shown in this Figure, the electromagnet  40  is fixed at a three-phase interphase position to the casing-rear surface  22  by the bolt  45 . The three vacuum valves for three phases are lined up in substantially parallel to the casing-rear surface  22 , onto which the mounting plate  43  is fixed, among the surfaces of the casing  1 . Inside the rear surface to which the mounting plate  43  is fixed, the mounting plate  43  is fixed with respect to the casing  1  by the bolt  45  provided at the interphase position among the vacuum valves for three phases. At the interphase position, a workspace for allowing bolt-fastening or the like to be performed can be obtained, so that the fixing work of the electromagnet is made easier. 
         [0023]    In this embodiment, the support plate  46  which has the stopper  47  stopping the movement of the rod  62  is arranged on the surface in the casing  1  that is different from the surfaces onto which the condenser  11  and the control board  10  are fixed, so that the vibration of the movable rod is not transmitted directly to the condenser  11  and the control board  10 , and reliability can be improved. 
         [0024]    More specifically, the support plate  46  is formed separatedly (floatedly) from the casing-bottom surface of the casing  1  and, on the other hand, the condenser  11  is installed on the casing-bottom surface of the casing  1  and the control board  10  is installed on the lateral surface side of the casing  1 . Thereby, the propagation of the vibration from the rod  62  is made more difficult, and the reliability is improved. 
         [0025]    Moreover, although as described above in this embodiment, the support plate  46  which has the stopper  47  stopping the movement of the rod  62  is arranged on the surface in the casing  1  that is different from the surfaces onto which the condenser  11  and the control board  10  are fixed, even in a case where the condenser  11  and the control board  10  are arranged on the same surface, if they are connected to the surface via any vibration-proofing member, the shock due to the vibration can be relieved. 
         [0026]    Although the control board  10  and the support plate  46  having the stopper  47  stopping the movement of the rod  62  are not arranged on the same surface inside the casing  1  in this embodiment, the control board  10  is fixed with respect to the casing via the vibration-proofing member. 
         [0027]    Moreover, in this embodiment, the electromagnet  40  is formed integrally with the support plate  46 , so that they can be mounted integrally to the casing and work process can be simplified. That is, the electromagnet  40  and the support plate  46  are integrally formed, thereafter, assembly sequences such as mounting of them to the casing  1  can be prepared, fixing may be made sufficient by one-time fixing with respect to an integral structure including the electromagnet  40  and, as compared to a case where the respective members are separately present and are all mounted to the casing, work in the casing whose space is limited is reduced and efficiency of the work is improved. Particularly, the fixing with respect to the casing by the mounting plate  43  is applied to the rear surface, so that mounting step that is performed from a downward direction of the casing  1  and is poor in working property is not required and is more simplified as compared to a case where any fixed portion is provided on the bottom surface. As long as the fixed portion is not applied to the bottom surface, this effect can be also exerted, for example, even in a case where the fixed portion is applied to an upper surface or lateral surface of the casing. 
         [0028]    Moreover, if the mounting plate  43  for fixing the electromagnet  40  employed in this embodiment to the casing-rear surface  22  is formed of high rigidity material (for example, stainless steel or the like), the mounting plate  43  can be used as not only a mounting member but also a member for reinforcing the casing (rib). In this case, the rigidity of the casing is increased to thereby reduce deflection, thus resulting in an effect of suppressing an increase in the energy required for causing the movable component such as the shaft  32  to be vertically moved. 
         [0029]    Moreover, the rib is extended to the right end or left end direction of the casing-rear surface  22  (in a vertical direction when the mounting plate  43  is vertically arranged) so as to be formed as a fixing member having a length more than that of the electromagnet, whereby the function of the rib can be more improved. Moreover, the mounting plate  43  is made longer than a width of one inner surface of the casing (a height of the one inner surface of the casing when the mounting plate  43  is mounted in a height direction), and is formed so as to have a curved shape, and can be fixed to the surface of the casing  1 , onto which the electromagnet  40  is fixed, and any surface of the casing  1  other than the surface of the casing  1  onto which the electromagnet  40  is fixed, whereby the mounting plate  43  has the curved portion and the durability of the mounting plate with respect to multi-directional forces can be improved. 
       REFERENCE SIGNS LIST 
       [0030]      1 : Casing 
         [0031]      10 : Control board 
         [0032]      11 : Condenser 
         [0033]      20 : Casing-lateral surface 
         [0034]      21 : Casing-bottom surface 
         [0035]      22 : Casing-rear surface 
         [0036]      23 : Casing-upper surface 
         [0037]      24 : Vibration-proofing member 
         [0038]      30 : Three-phase connecting shaft 
         [0039]      31 ,  33 ,  102 : Pin 
         [0040]      32 : Shaft 
         [0041]      34 ,  36 : Lever 
         [0042]      35 : Pressing plate 
         [0043]      40 : Electromagnet 
         [0044]      41 : Stationary rod 
         [0045]      42 : Break spring 
         [0046]      43 : Mounting plate 
         [0047]      44 : Shock absorber 
         [0048]      45 : Bolt 
         [0049]      46 ,  74 ,  76 : Support plate 
         [0050]      47 : Stopper 
         [0051]      48 : Coil 
         [0052]      49 : Coil bobbin 
         [0053]      56 : Plate 
         [0054]      58 : Movable iron core 
         [0055]      60 : Stationary iron core 
         [0056]      62 : Rod 
         [0057]      64 : Movable planar plate 
         [0058]      66 : Movable planar plate 
         [0059]      68 : Permanent magnet 
         [0060]      70 : Cover 
         [0061]      72 : Side leg 
         [0062]      82 ,  84 : Through-hole 
         [0063]      100 : Breaker section 
         [0064]      101 : Lever 
         [0065]      114 : Insulating rod 
         [0066]      121 : Flexible conductor 
         [0067]      122 : Feeder 
         [0068]      124 : Movable conductor 
         [0069]      130 : Upper contactor 
         [0070]      132 : Lower contactor 
         [0071]      174 : Support plate