JP4430206B2 - Magnetic contactor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic contactor that switches contacts and turns contacts on and off.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, electromagnetic contactors that switch contacts or turn on and off by exciting a coil are well known. Among such electromagnetic contactors, there is a so-called instantaneous excitation type mechanical holding type. The outline of the conventional structure of the instantaneous excitation type mechanical holding type electromagnetic contactor will be described with reference to FIGS. A conventional electromagnetic contactor 51 of this type includes a switching mechanism portion 52, a main contact portion 53, and an auxiliary contact portion 54.
[0003]
The switching mechanism 52 includes an A power supply side input coil 61, a B power supply side input coil 62, an A power supply side power supply terminal 63, a B power supply side power supply terminal 64, a load side terminal 65, and an operation circuit terminal block. 66, two movable part shafts 67, 67, contact holding leaf springs 68, 69, an A power source side self-switching movable auxiliary contact 70, and a B power source side self-switching movable auxiliary contact 71. The two movable portion shafts 67 and 67 extend to the auxiliary contact portion 54 and rotate around the rotation shaft 72.
[0004]
The main contact portion 53 is a mechanism portion in which the switching mechanism portion 52 alternately brings the A power supply side power supply terminal 63 to the load side terminal 65 and the B power supply side power supply terminal 64 to the load side terminal 65. . In the main contact portion 53, a plurality of main contact switching mechanisms 73, in the example shown, three main contact switching mechanisms 73, 73, 73 are provided.
[0005]
The auxiliary contact portion 54 has an auxiliary contact 74, and is used for switching contacts for operating other auxiliary mechanisms in conjunction with the switching of each contact at the main contact portion 52. . A person who uses this electromagnetic contactor 51 will use this auxiliary contact 74 as needed. The movable portion shafts 67 and 67 are supported by shaft holding bodies 75 provided on both sides of the apparatus.
[0006]
Next, the outline of the operation of the magnetic contactor 51 having the above structure by the instantaneous excitation type and the operation of the machine holding type will be described first, and then the detailed operation will be described.
[0007]
The instantaneous excitation type is a mechanism that excites one of the making coils 61 and 62 only at the time of switching, that is, at the time of operation, and makes the making coils 61 and 62 non-excited after the switching is completed.
[0008]
Specifically, the A power supply side input coil 61 and the B power supply side input coil 62 are provided to cut off the excitation currents of the input coils 61 and 62 incorporated in the switching mechanism 52. It is excited via each self-switching movable auxiliary contact 70, 71. When a switching command is input to the A power source side or the B power source side, the A power source side turning coil 61 or the B power source side turning coil 62 is excited and the switching operation is performed. The self-switching movable auxiliary contacts 70 and 71 are mechanically turned off in conjunction with the pushing operation of the 67 auxiliary contacts 74. Therefore, after the switching is completed, the exciting currents of the making coils 61 and 62 are cut off by the self-switching movable auxiliary contacts 70 and 71 and are not excited. Only current flows through each of the closing coils 61 and 62, and this is economically advantageous since there is no power consumption at all times, and excitation sound is eliminated.
[0009]
The machine holding type is a mechanism that does not electrically hold the contact input state by, for example, the attraction force of the coil but holds the contact input state by the force of the leaf springs 68 and 69 of the mechanism portion.
[0010]
Specifically, when a switching signal is output, one of the making coils 61 and 62 is excited via one of the self-switching movable auxiliary contacts 70 and 71. For example, when the A power supply coil 61 is excited, the movable portion shafts 67 and 67 move in an arc shape around the rotation shaft 72. By this movement, the main contact on the input side, that is, the B power supply side starts to open. When the operation further proceeds and the movable part reaches the neutral point, the leaf springs 68 and 69 are compressed to the maximum, and a dead point is formed. When the movable iron core operated by the closing coil 61 is further attracted and exceeds the dead point, the movable portion shafts 67 and 67 continue to move by the extension force of the contact holding leaf spring 69, and the A power source side which is the contact on the opposite side The main contact is turned on.
[0011]
In the process of turning on the opposite main contact beyond the dead point, the self-switching movable auxiliary contact 70 cuts off the current to the A power supply side turning-on coil 61, and the coil 61 is de-energized. After the operation is completed, the main contact part on the A power source side and the automatic switching movable auxiliary contact 71 part are both maintained with appropriate contact force, so there is no contact opening or contact pressure change due to fluctuations in power supply voltage. There is no need to worry about contact heat generation. Even if an abnormality occurs in the control circuit power supply and the operation power supply is lost, the main contact is held by the contact holding leaf springs 68 and 69, so that the main circuit power supply is continued. Further, switching by a manual operation handle (not shown) can be performed.
[0012]
Next, the detailed structure and operation of the electromagnetic contactor 51 will be described.
[0013]
The switching mechanism 52 is provided with solenoids 81 and 82 for both the A side and the B side having the respective coils 61 and 62 for charging. The solenoids 81 and 82 are provided with an A power source side movable iron core 83 and a B power source side movable iron core 84 which are engaged with the shaft holder 75 and the engagement shafts 76 and 76, respectively. FIG. 5A shows the B power-on state. When a switching command to the A power source side is issued from this state, the A power source side movable iron core 83 is sucked, and the movable portion shafts 67 and 67 move in an arcuate manner around the rotation shaft 72 in conjunction with it. FIG. 5B shows the way of switching from the B power source to the A power source. This is the dead point. FIG. 5C shows the A power-on state (switching end). Thereafter, when a switching command to the B power supply side is issued, the process shifts from FIG. 5C to FIG. 5B, and further shifts to FIG. 5A to complete the switching. Such an operation is repeated every time a switching command is issued.
[0014]
The operation of the self-switching movable auxiliary contacts 70 and 71 of the electromagnetic contactor 51 is as follows. That is, FIG. 6A shows a state where the B power is turned on and is in an operation standby state toward the A power source. In this state, the A power source side self-switching movable auxiliary contact 70 contacts the A power source side self-switching fixed auxiliary contact 85, and the B power source side self-switching movable auxiliary contact 71 is not in contact with the B power source side self-switching fixed contact 86. ing. FIG. 6B shows a dead point passing point in the middle of switching from the B power source to the A power source, and the A power source side self-switching auxiliary contact 70 is not yet cut off.
[0015]
FIG. 6C shows an A power-on state (switching end), and the A power-supply side self-switching movable auxiliary contact 70 blocks the current flowing through the A power-supply-side coil 61. At the same time, the B power source side self-switching movable auxiliary contact 71 contacts the B power source side self-switching fixed auxiliary contact 86 to create a standby state for switching to the B power source side. Thereafter, when a switching command to the B power supply side is issued, the process shifts from FIG. 6C to FIG. 6B, and further shifts to FIG. 6A to complete the switching.
[0016]
Each of the self-switching movable auxiliary contacts 70 and 71 supports an auxiliary contact fulcrum 87 that supports the auxiliary contacts 74 and 74 and interlocks with the movement of the swinging swinging body 88. Further, the rocking body 88 is interlocked with the movement of the movable portion shafts 67 and 67.
[0017]
The operation of each main contact switching mechanism 73 in the main contact portion 53 is as follows. That is, the states shown in FIGS. 7A, 7B, and 7C are repeated in the order of (A) → (B) → (C) → (B) → (A). FIG. 7A shows the B power-on state. The power is supplied from the B power supply side power supply terminal 64 to the load side terminal 65 via the B power supply side contact fixed contact 91, the B power supply side main contact movable contact 92, and the lead wire 93. FIG. 7B shows the way of switching from the B power source to the A power source. At this time, the main circuit current on the B power supply side is almost completely cut off.
[0018]
FIG. 7C shows the A current input state (switching end). The power is supplied to the load side terminal 65 through the A power source side main contact fixed contact 94 and the A power source side main contact fixed contact 94 via the A power source side main contact movable contact 95 and the lead wire 93. The main contact portion 53 is given an appropriate contact force by the force of the two leaf springs 68 and 69 and maintains the closing state.
[0019]
A power source side arcing contact 96 is provided at the tip of the A power source side main contact movable contact 95, and a B power source side arcing contact 97 is provided at the tip of the B power source side main contact movable contact 92. Further, compression springs 98 and 98 for main contacts are provided between the movable portion shafts 67 and 67 and the movable contacts 92 and 95 for both main contacts. A plurality of arc extinguishing chamber grid plates 99 for extinguishing the arc are provided.
[0020]
[Problems to be solved by the invention]
The conventional electromagnetic contactor 51 has a shape in which the contact holding leaf springs 68 and 69 protrude to the side, and is difficult to reduce in size. The dead point is a point where the three members of the two contact holding leaf springs 68 and 69 and the shaft holding body 75 holding the movable portion shafts 67 and 67 become horizontal. It has become difficult.
[0021]
The movable iron cores 83 and 84 and the shaft holder 75 that holds the movable portion shafts 67 and 67 are engaged with each other by an engagement shaft 76. There is a problem that the wear of the long hole into which the material enters and the position of the dead point changes. In addition, the guide holes of the movable iron cores 83 and 84 need to have a larger diameter than the movable iron cores 83 and 84, leading to generation of rattling and an increase in the size of the solenoids 81 and 82.
[0022]
Further, the conventional structure for holding the movable contacts 92 and 95 is weak against the pressure from the fixed contacts 91 and 94, and the main contact compression springs 98 and 98 are used to absorb the pressure. It is necessary. The movable contacts 92 and 95 are returned to their original positions by the main contact compression springs 98 and 98, but the fixed positions of the movable contacts 92 and 95 are loosened and fixed by a number of operations including the return operation. There is also a risk that a stable contact with the contact cannot be obtained.
[0023]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electromagnetic contactor that is easy to miniaturize and that is easy to adjust a dead point. Another object of the present invention is to provide an electromagnetic contactor that is unlikely to change the position of a dead point and that does not lead to rattling or an increase in the size of a solenoid. Another object of the present invention is to provide an electromagnetic contactor in which a movable contact has sufficient strength and can perform stable contact.
[0024]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the electromagnetic contactor of the present invention is provided with a fixed portion, two solenoids attached to the fixed portion, each having a coil, and arranged in a central space of each coil and driven by each solenoid. Two movable iron cores, a movable contact holder attached to the fixed part via the support part, and swinging by alternately pushing up or pulling the movable iron core, and disposed at least on one end side of the movable contact core In a magnetic contactor having a movable contact connected to a power supply terminal, facing the movable contact, and a fixed contact that contacts the movable contact, the movable contact holding body has a T-shaped cross section, and each line constituting the T-character The point of intersection of or the vicinity thereof is used as the swinging fulcrum of the movable contact holder, one end of the leaf spring is abutted against the tip part protruding below the T-shape, and the tip part can swing together with the tip part. The other end of the spring is abutted so that the position is held by the fixed part, and the leaf spring alternately holds the two positions, the position where the movable contact and the fixed contact are in contact with each other, and the position where both the contacts are not in contact. ing.
[0025]
In this way, the movable contact holder has a T-shaped cross section, and the intersection of each line constituting the T-shape or the vicinity thereof is the swing fulcrum of the movable contact holder. Can be made small and easy to miniaturize. In addition, the two members of the plate spring and the portion projecting downward from the movable contact holding body swing the movable contact holding body and form a dead point. Therefore, the size can be reduced and the dead point can be easily adjusted.
[0026]
Furthermore, in another invention, in addition to the electromagnetic contactor of the above-described invention, the length between the swing fulcrum and the portion where the other end held by the fixed portion of the leaf spring contacts the height of the solenoid. In the operating direction of the movable iron core operated by the solenoid, the length of the movable iron core is made shorter than the length including the portion protruding from the solenoid. For this reason, the height as an electromagnetic contactor also becomes low and can be reduced further.
                                                                            more than
[0027]
In addition, an electromagnetic contactor of another invention includes two solenoids, two movable iron cores driven by each solenoid, a movable contact holder that swings by alternately pushing up or pulling the movable iron cores, In an electromagnetic contactor having a movable contact disposed on at least one end side of the movable contact holder and a fixed contact facing the movable contact and contacting and separating the movable contact, the movable contact holder has a T-shaped cross section. The intersection portion of each line constituting the T-shape or the vicinity thereof is used as a swing fulcrum of the movable contact holder, the solenoid is a cylindrical coil, a fixed iron core disposed in the central space of the coil, and the central space of the coil A movable iron core that is disposed on the opposite side of the fixed iron core and is attracted to the fixed iron core, and that is fixed to the movable iron core, passes through the center hole of the fixed iron core, and has both T-shaped ends of the movable contact holder. One It constitutes a contact and separating from operation rod, a coil spring for urging in a direction to release the movable iron core from the fixed core to.
[0028]
In this way, the movable contact holder has a T-shaped cross section, and the intersection of each line constituting the T-shape or the vicinity thereof is the swing fulcrum of the movable contact holder. Can be made small and easy to miniaturize. In addition, the two members of the plate spring and the portion projecting downward from the movable contact holding body swing the movable contact holding body and form a dead point. Therefore, the size can be reduced and the dead point can be easily adjusted. Moreover, since the solenoid is configured as described above, the position change of the dead point is less likely to occur, wear is reduced, and rattling is less likely to occur. Furthermore, since the central hole of the coil into which the movable iron core enters can be made small, the solenoid does not increase in size.
[0029]
In addition, an electromagnetic contactor of another invention includes two solenoids, two movable iron cores driven by each solenoid, a movable contact holder that swings by alternately pushing up or pulling the movable iron cores, In an electromagnetic contactor having a movable contact disposed on at least one end side of a movable contact holder and a fixed contact that faces the movable contact and contacts the movable contact, the movable contact is a base contact. A contact piece made of a metal plate having a contact point at the tip and a contact point, and a concave part that engages with the head part of the screw and a holding part that allows the central part of the movable contact point to come into and out of contact with each other. The movable contact positioning means having a movable contact holding body is provided on the movable contact holding body, and when the movable contact comes into contact with the fixed contact, the movable contact is separated from the movable contact positioning means, and when the movable contact is separated from the fixed contact, the movable contact positioning is determined. Movable contact is adapted to abut against the unit.
[0030]
If comprised in this way, the root part of a movable contact will be strongly hold | maintained by the movable contact positioning means with which the screw and the front-end | tip of the screw engage, and a movable contact will have sufficient intensity | strength. For this reason, the contact between the movable contact and the fixed contact is stabilized.
[0031]
Furthermore, in addition to the above-described inventions, other inventions are provided with movable contacts that are directed toward both ends of the movable contact holder, and fixed contacts are provided on the fixed portion corresponding to the movable contacts.
[0032]
With this configuration, the contact can be switched, and switching between the commercial power source and the private power source, switching between the commercial power source and the backup power source, or the like can be performed.
[0033]
In addition, in addition to the electromagnetic contactor of each of the above-described inventions, another invention excites a coil constituting the solenoid only when the movable contact holder is swung from one to the other or from the other to the other, After the end of the coil, the coil is not excited.
[0034]
If comprised in this way, what is called instantaneous excitation will be attained and an electric current will flow into a coil only when the movable contact holder is rocked. This eliminates the need for constant power consumption, is economically advantageous, and does not generate excitation sound.
[0035]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the electromagnetic contactor 1 of embodiment of this invention is demonstrated based on FIG. 1 and FIG. The electromagnetic contactor 1 is an instantaneous excitation type mechanical holding type electromagnetic contactor, similar to the conventional electromagnetic contactor 51 described above. The electromagnetic contactor 1 is a device used when switching between a commercial power source and an emergency power source. As an emergency power source, a power source by private power generation, a backup storage battery power source, or the like is employed.
[0036]
Like the conventional electromagnetic contactor 51, this electromagnetic contactor 1 is comprised from the switching mechanism part, the main contact part, and the auxiliary contact part, and the function and structure of each part are fundamentally electromagnetic contactors. 51. For this reason, the difference will be mainly described below, and the description of the same part will be omitted or simplified. The same members as those of the electromagnetic contactor 51 are denoted by the same reference numerals.
[0037]
The switching mechanism section includes a cylindrical A power supply side input coil 61, a cylindrical B power supply side input coil 62, an A power supply side power supply terminal 63, a B power supply side power supply terminal 64, and a load side terminal 65. , Operation circuit terminal block (not shown), one movable part shaft 67, one contact holding leaf spring 2, A power supply side self-switching movable auxiliary contact (not shown), B power supply side self-switching movable Auxiliary contacts (not shown).
[0038]
The switching mechanism unit further includes an A power supply side solenoid 3 having an A power supply side input coil 61 and a B power supply side solenoid 4 having a B power supply side input coil 62. The A power supply side solenoid 3 is disposed in the central space of the case 5 serving as a fixed portion, the fixed iron core 6 that is disposed in the central space of the A power supply side input coil 61 and is fixed to the case 5, and the coil 61. A movable iron core 7 that faces the fixed iron core 6 and is attracted to the fixed iron core 6 when the coil is excited, an operation rod 9 that is fixed to the movable iron core 7 and passes through the center hole 8 of the fixed iron core 6, and a fixed A coil spring 10 is interposed between the iron core 6 and the movable iron core 7 and urges the movable iron core 7 in a direction away from the fixed iron core 6.
[0039]
The B power supply side solenoid 4 has the same configuration as the A power supply side solenoid 3, and includes a fixed iron core 6, a movable iron core 7, an operating rod 9 penetrating the center hole 8 of the fixed iron core 6, and a coil spring 10. And have.
[0040]
The movable portion shaft 67 extends to the auxiliary contact portion and rotates about the rotation shaft 72. The movable part shaft 67 is held by shaft holding bodies 75 arranged at both ends. The shaft holder 75 and the movable portion shaft 67 are supported by the support portion 11 so as to be swingable integrally.
[0041]
The leaf spring 2 for holding a contact is composed of two leaf spring materials 2a and 2a, and generates a biasing force by bending in an arc shape in opposite directions. One end of the leaf spring 2 hits the center of the triangular concave portion 13 at the tip of the shaft portion 12 of the movable contact holding body, which is a shaft holding body 75 and serves as a movable contact holding means described later, and the other end is fixed to the mounting plate 13. The support substrate 14 is pressed against the center of the triangular recess 15 so as to be able to hold the position. The mounting plate 13 and the support substrate 14 are both fixed portions.
[0042]
As shown in FIG. 1, the shaft holding body 75 has a T-shaped cross section, and a rotating shaft 72 is provided in the vicinity of the intersection of each line constituting the T-shape. Has been. The state shown in FIG. 1 shows a state in which the B power source is applied to the load in the B power on state, and this state is the state most swayed to one side. When a command to switch to the A power source side is issued from the state of FIG. 1, the shaft holder 75 swings about the rotation shaft 72 and is in a line-symmetric position with respect to the state of FIG. The leaf spring 2 is most bent when the switching middle position, that is, when the leaf spring 2 is vertical in FIG. In addition, you may make it provide the rotating shaft 72 in the intersection part of each line which comprises T character.
[0043]
The fixed iron core 6 is provided with a small-diameter small-diameter central hole 21 and a medium-diameter medium-diameter central hole 22 that constitute the central hole 8. The movable iron core 7 is provided with a medium diameter center hole 23 having the same diameter as the medium diameter center hole 22 of the fixed iron core 6, a screw hole 24, and a large diameter large diameter center hole 25. The coil spring 10 is inserted into both the middle diameter center holes 22 and 23. The length L1 between the center of the rotating shaft 72 and the portion of the leaf spring 2 on the triangular concave portion 15 side in contact with the triangular concave portion 15 is set to the height of the solenoids 3 and 4 to the movable iron core. 7 and the operating rod 9 are made shorter than the length L2 including the portions protruding from the main bodies of the solenoids 3 and 4.
[0044]
The operation rod 9 and the coil spring 10 are assembled as follows.
[0045]
First, the fixed iron core 6 is fixed to the case 5. Next, the threaded portion 9 a at the tip of the operating rod 9 is inserted so as to penetrate the center hole 8. Thereafter, the coil spring 10 is inserted from the threaded portion 9 a side of the operating rod 9 so that a part of the coil spring 10 enters the medium diameter hole 22. Next, the movable iron core 7 and the operating rod 9 are relatively rotated, and the screw hole 24 and the screw portion 9a are screw-engaged. Finally, the nut 26 is threadedly engaged with the threaded portion 9a via a washer or the like. The nut 26 completely enters the large diameter center hole 25.
[0046]
Although both the self-switching movable auxiliary contact and the self-switching fixed auxiliary contact are not shown, they have the same structure as the previous electromagnetic contactor 51 and perform the same functions and operations.
[0047]
The main contact portion is a mechanism portion in which conduction from the A power supply side power supply terminal 63 to the load side terminal 65 and conduction from the B power supply side power supply terminal 64 to the load side terminal 65 are alternately brought about by the switching mechanism portion. In the main contact portion, a plurality of main contact switching mechanisms, in this embodiment, three main contact switching mechanisms are provided.
[0048]
In addition to the terminals 63, 64, 65, the main contact switching mechanism includes a B power source side main contact fixed contact 91, a B power source side main contact movable contact 92, a lead wire 93, and an A power source side main contact. A fixed contact 94, a movable contact 95 for the A power source side main contact, an arc extinguishing chamber grid plate 99, and a movable contact positioning means 31 are provided.
[0049]
Each of the movable contacts 92 and 95 includes a contact piece 32 made of a metal plate and a contact 33 fixed to the tip of the contact piece 32, and a base portion of the contact piece 32 is attached to a shaft holding body 75 serving as a movable contact holding body. It is locked by a screw 34. This locking is performed by sandwiching the base of each contact piece 32 of each movable contact 92, 95 between the large-diameter head portion 35 of the screw 34 and the locking terminal portion 36 to which the lead wire 93 is connected. This is done by engaging a nut 37 with the tip of a screw 34 that penetrates 36. The contact 33 uses a silver alloy having high arc resistance, and has a configuration in which the contact portions of the fixed contacts 91 and 94 and the movable contacts 92 and 95 are in sliding contact during switching operation.
[0050]
A fixed contact spring holding bar 39 is disposed between the movable contact positioning means 31 and the spring engaging portion 38 of the shaft holding body 75. Contact springs 40a and 40b are installed between each spring locking portion 38 and each contact piece 32 so that the contact spring holding rod 39 is inserted.
[0051]
The movable contact positioning means 31 is fixed to the shift holding body 75, and the concave portion 41 in which the head portion 35 of the screw 34 fixing the movable contacts 92 and 95 is engaged (inserted), and the movable contacts 92 and 95. Each contact piece 32 has a holding portion 42 in which the central portion can be contacted and separated, and a through hole 43 through which the contact spring holding rod 39 is inserted.
[0052]
As shown in FIG. 2, when the B power source is turned on, that is, when the B power source side main contact movable contact 92 is in strong contact with the B power source side main contact fixed contact 91, the contact spring 40a is compressed. The movable contact 92 is separated from the holding portion 42 of the movable contact positioning means 31. On the other hand, when the movable contact 95 for the A power supply side main contact moves away from the fixed contact 94 for the A power supply side main contact, the movable contact 95 is applied to the holding portion 42 of the movable contact positioning means 31 by the urging force of the contact spring 40b. You will be in touch. The contact between the movable contacts 92 and 95 and the movable contact positioning means 31 and 31 is performed so that the A power source side and the B power source side are in an opposite relationship by the swinging of the shaft holder 75.
[0053]
The auxiliary contact portion (not shown) has a simple dustproof structure and a twin contact structure with a high contact reliability, and the entire structure is substantially the same as that of the previous electromagnetic contactor 51. .
[0054]
The operation of the magnetic contactor 1 configured as described above is similar to that of the previous magnetic contactor 51. Every time a switching command is generated, the B power on state is changed from the A power on state to the A power on state. It switches alternately to the input state. Since this electromagnetic contactor 1 is of an instantaneous excitation type, current flows through the coils 61 and 62 only at the moment of switching, so that power consumption hardly occurs and it is economically advantageous. No excitation sound is generated when continued.
[0055]
Since this electromagnetic contactor 1 is a mechanical holding type, the contact state is not electrically held, but is held by the force of the leaf spring 2, and the contact opening or contact pressure due to fluctuations in the power supply voltage is maintained. No change occurs. Further, no heat is generated at the contacts. Even if the control circuit power supply for switching malfunctions and the operating power supply is lost, the main contact maintains the ON state for either one of the power supplies, so the power supply to the main circuit power supply is maintained. Is done.
[0056]
Further, when an abnormality occurs in the control circuit power supply for switching and switching cannot be performed automatically, the manual operation handle 45 is fitted into the protrusion 46 serving as a handle receiver of the shaft holder 75 to apply the force to the arrow in FIG. Switching in the indicated direction allows manual switching. When using the manual operation handle 45, it is necessary to turn off the operation power and the main circuit power (A power, B power) in advance for safety.
[0057]
The above-described embodiment shows an example of a preferred embodiment of the present invention, but various modifications can be made without departing from the gist of the present invention. For example, instead of switching between two power sources, an electromagnetic contactor that simply turns on and off one contact may be used.
[0058]
Further, instead of a mechanism that alternately pushes up the shaft holder 75 that is the movable contact piece holding body by the operating rod 9, a mechanism that alternately pulls down the movable contact piece holding body as shown in FIGS. good. Further, when the push-up mechanism is used, the shaft holder 75 and the operation rods 9 and 9 may be loosely coupled using a long hole without separating them.
[0059]
Further, in the above-described embodiment, the movable region of the leaf spring 2 and the shaft portion 12 is arranged on the side of the solenoids 3 and 4 (behind in FIG. 1) in order to increase the movable region and reduce the overall width W. However, you may arrange | position so that the leaf | plate spring 2 and the axial part 12 may be pinched | interposed between both solenoids 3 and 4. FIG. In this case, the overall width W is slightly larger, but the space between the solenoids 3 and 4 is effectively used, which is advantageous in terms of downsizing in the length direction. Furthermore, the plate spring 2 may be configured by only one plate spring member 2a, or may be configured by bending a single plate. Further, instead of the leaf spring 2, a compression coil spring or rubber having strong elasticity may be used.
[0060]
In this electromagnetic contactor 1, an overlap period in which two power sources are simultaneously applied to a load is prevented from occurring. However, in order to prevent the power source from being cut off even slightly, the arrangement of each contact is devised. Thus, an overlap period can be provided.
[0061]
In addition to the above, examples of the use of the magnetic contactor 1 include a DC power source in a normal state in a mobile phone base station or the like (this power source is converted from an AC power source to a DC power source) and an emergency backup. Examples include switching to a battery, switching from a power source for private power generation to a commercial power source, switching between emergency power sources, and the like.
[0062]
【The invention's effect】
In the present invention, it is possible to obtain an electromagnetic contactor that is easy to miniaturize and that is easy to adjust a dead point. Furthermore, in another invention, it is possible to obtain an electromagnetic contactor that hardly changes the position of the dead point and does not lead to generation of rattling or enlargement of the solenoid. In another aspect of the invention, an electromagnetic contactor having a stable on / off operation can be obtained because the movable contact has sufficient strength and the contact between the movable contact and the fixed contact is stabilized.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a solenoid portion in a switching mechanism portion of an electromagnetic contactor showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a main contact portion of the electromagnetic contactor of FIG.
FIG. 3 is a plan view of a conventional electromagnetic contactor.
4 is a right side view of the electromagnetic contactor of FIG. 3;
5 is a cross-sectional view of a solenoid portion in the switching mechanism of the electromagnetic contactor of FIG. 3, where (A) shows a B power-on state, (B) shows a switching operation in progress, and (C) shows an A power source. It is a figure which shows an insertion state.
6 is a diagram showing the operation of the self-switching auxiliary contact in the switching mechanism of the electromagnetic contactor of FIG. 3, where (A) shows the B power-on state, (B) shows the middle of the switching operation, and (C ) Is a diagram showing a power-on state of A.
7 is a cross-sectional view of the main contact portion of the electromagnetic contactor of FIG. 3, in which (A) shows the B power-on state, (B) shows the switching operation in progress, and (C) shows the A power-on state. FIG.
[Explanation of symbols]
1 Magnetic contactor
2 leaf spring
3 A power supply side solenoid
4 B power supply side solenoid
5 cases
6 Fixed iron core
7 Movable iron core
8 Center hole
9 Operation stick
10 Coil spring
13 Mounting plate (fixed part)
14 Support substrate (fixed part)
31 Movable contact positioning means
32 pieces
33 contacts
34 screw
35 Screw head
41 recess
42 Holding part
61 A Power-supply coil (coil)
62 B Coil for power supply side (coil)
72 Rotating shaft (Oscillation fulcrum)
75 Shaft holder (movable contact holder)
91 B Power supply side main contact fixed contact (fixed contact)
92 B Power source side main contact movable contact (movable contact)
94 A Power source side main contact fixed contact (fixed contact)
95 A Power source side main contact movable contact (movable contact)

Claims (4)

A fixed part, two solenoids attached to the fixed part, each having a coil, two movable iron cores arranged in a central space of each coil and driven by each solenoid, and the fixed part via a support part The movable contact holding body that is attached to the movable iron core and swings by alternately pushing up or pulling the movable iron core, the movable contact disposed on at least one end side of the movable contact holding body, and connected to the power supply terminal, the movable In an electromagnetic contactor having a fixed contact opposite to and contacting the movable contact, the movable contact holding body has a T-shaped cross section, and the intersection of each line constituting the T-character or the vicinity thereof is the movable contact. The swinging fulcrum of the holding body, one end of the leaf spring is abutted against the tip portion protruding downward from the T-shape, and the other end of the leaf spring can be swung with the tip portion. Butted as position holding to the fixed part, and a position where the movable contact and the fixed contact are in contact, the two positions of the position where the two contacts are out of contact so as to hold alternately by the plate spring An electromagnetic contactor characterized by that. The length between the swing fulcrum and the portion of the leaf spring held by the fixed portion that is in contact with the other end is set to the height of the solenoid in the direction of movement of the movable iron core operated by the solenoid . The electromagnetic contactor according to claim 1, wherein the movable iron core is shorter than a length including a portion protruding from the solenoid . The electromagnetic according to claim 1 or 2 , wherein the movable contact is provided so as to face both ends of the movable contact holder, and the fixed contact is provided in the fixed portion corresponding to each movable contact. Contactor. Wherein the only exciting the coil constituting the solenoid when the movable contact holder from one to swing to one to or from the other other hand, after the end of its swinging, characterized in that it has a non-energized the coil Item 4. The electromagnetic contactor according to any one of Items 1 to 3 .

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