JP2006216437A - Electromagnetic contactor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of assembling a DC operated electromagnetic contactor constructed with an existing AC-DC operated electromagnetic contactor as a main body whose components are changed only in part. <P>SOLUTION: The electromagnetic contactor comprises an operation electromagnet, a contact holder, a movable contact, and a fixed contact mounted on an up-and-down split body case. When an upper frame 3 and a lower frame 2 of the body case 1, a contact mechanism including the contact holder 8, the movable contact 9 and the fixed contact 10 mounted on the upper frame, and a movable core 5 joined to the contact holder are used as common components for constructing the AC-DC operated electromagnetic contactor, the upper frame is laid on the lower frame which is mounted with a fixed core of the operation electromagnet with a coil wound thereon and a coil driving electronic circuit unit and it is joined directly thereto. When constructing the DC operated electromagnetic contactor, the lower frame is mounted with the fixed core of the operation electromagnet with the coil 6 wound thereon into DC operated specifications and then an intermediate frame 12 is additionally mounted and assembled between the upper frame and the lower frame to cover a height difference of the fixed core of the electromagnet. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a configuration of an electromagnetic contactor applied to an operation control system of an electric motor or the like.

As for the electromagnetic contactors mentioned above, AC operation type and DC operation type electromagnetic contactors (standard products) as well as AC / DC operation type electromagnetic contactors are known according to the excitation method of the operating electromagnet. Shaped products are widely deployed in the market.
Next, the configurations of the AC operation type magnetic contactor and the DC operation type magnetic contactor described above are shown in FIGS. In each figure, 1 is a main body case of an electromagnetic contactor having a vertically divided structure composed of a lower frame 2 and an upper frame 3, 4 is a fixed core 4 of an operating electromagnet, 6 is a movable core, and 6 is an operation wound around the fixed core 4 A coil, 6a is an external connection terminal of the operation coil 6, 7 is a return spring, 8 is a contact holder connected to the movable core 5, 9 is a bridge-shaped movable contact mounted on the contact holder 8, and 10 is an external connection This is a fixed contact that also serves as a terminal.
Here, the operation electromagnet (AC electromagnet) of the AC operation type magnetic contactor shown in FIG. 7 has a fixed core 4 and a movable core 5 made of a stratified iron core in order to suppress iron loss and twist due to AC excitation, and a magnetic pole end face. Has a coiling coil. On the other hand, in the DC operation type magnetic contactor shown in FIG. 8, since the operation electromagnet (DC electromagnet) is DC-excited, the core is constituted by a bulk iron core, and the fixed core is controlled so as to keep the excitation current at the time of charging low. The operation coil 6 wound around 4 has an increased number of turns to increase the coil resistance. For this reason, the height dimension from the bottom surface of the fixed core 4 to the magnetic pole surface is fixed in the AC operation type shown in FIG. It is taller than the core 4. In accordance with the height of the fixed core 4, the lower frame 2 of the main body case 1 is configured to be taller than the AC operation type fixed core 4 (see FIG. 7).

On the other hand, the AC / DC operation type electromagnetic contactor employs an electronic circuit unit that combines a rectifier and an excitation control circuit (IC) in the operation circuit of the electromagnet, reducing the power consumption of the operation electromagnet (DC electromagnet) and changing the voltage of the power supply. The structure and function of the coil operation circuit is described in detail in Patent Document 1.
Next, with regard to the above-described AC / DC operation type magnetic contactor, the configurations of the magnetic contactors that have already been commercialized and are on the market are shown in FIGS. This is explained with the aid of. That is, in the illustrated AC / DC operation type contactor, an operation magnet (direct current electromagnet) fixed core 4, a movable core 5, an operation coil 6, A contact mechanism comprising a contact holder 8, a movable contact 9, and a fixed contact 10 is mounted, and the electronic circuit unit 11 described above is incorporated in the bottom of the lower frame 2 (the space behind the base). In the figure, 10a is a terminal screw of the stationary contact 10, 11a is an external connection terminal of the electronic circuit unit 11, 13 is an auxiliary contact unit (external accessory device), and the external connection terminal 11a is an outer surface of the body case 1. The auxiliary contact unit 13 as an accessory part is externally attached to the side surface of the main body case 1.
Japanese Examined Patent Publication No. 62-58121

In the above-described AC / DC operation type electromagnetic contactor, the electromagnet is a DC electromagnet, and the electronic circuit unit 11 employed in the operation circuit increases the attraction force of the electromagnet by flowing a large excitation current when the electromagnetic contactor is turned on. After the charging, the exciting current for holding the movable core 5 in the attracted state is reduced. As a result, the operation coil 6 does not need to increase the number of turns unlike the DC operation type described in FIG.
By the way, while the AC / DC operation type electromagnetic contactor has the above-mentioned features and advantages, the use of an electronic circuit unit makes the product price expensive, and depending on the control system to which the electromagnetic contactor is applied, it may be a significant Variations in power supply voltage due to excitation current may affect the entire system. From this point of view, a low-price DC-operated electromagnetic contactor that does not use an electronic circuit unit (corresponding to the electromagnetic contactor in FIG. 8) is required as a series product based on the above-mentioned AC / DC operation-type electromagnetic contactor. Yes.

  The present invention has been made in view of the above points, and it is possible to manufacture a DC operation type electromagnetic contactor at a low cost by using the above-mentioned AC / DC operation type electromagnetic contactor as a base body and by sharing parts as much as possible. An object of the present invention is to provide an assembly structure for an electromagnetic contactor.

In order to achieve the above object, according to the present invention, a configuration in which an operating electromagnet, a contact holder connected to a movable core of the electromagnet, a movable contact, and a fixed contact are mounted on a vertically divided main body case. In the magnetic contactor
The upper frame and the lower frame constituting the main body case, the contact holder mounted on the upper frame, the movable contact, the contact mechanism including the fixed contact, and the movable core of the operation electromagnet are used as common parts.
When configuring an AC / DC operation type magnetic contactor, the upper frame is placed on the upper frame on the lower frame on which the operating electromagnet fixed core wound with the coil and the electronic circuit unit for driving the coil are mounted. A direct connection between
When constructing a DC operation type magnetic contactor, install a fixed core of an operation electromagnet with a coil that is a DC operation type specification on the lower frame, and place it between the upper frame and the lower frame. Assume that the frame is assembled (Claim 1). Specifically, the intermediate frame is configured in the following manner.
(1) The height of the intermediate frame is set to a size that complements the difference in height between the fixed core employed in the AC / DC operation type and the fixed core employed in the DC operation type.
(2) The intermediate frame is provided with an external connection terminal of the operation coil.

  According to the above configuration, the AC / DC operation type electromagnetic contactor that has already been commercialized is used as a base, the operation electromagnet coil and fixed core are replaced with DC operation type specification parts, and an intermediate frame is added to the main body case. By installing, it is possible to configure a DC-operated electromagnetic contactor by sharing other components. As a result, the AC / DC operation type electromagnetic contactor and the DC operation type electromagnetic contactor can be provided at low cost while keeping the investment required for changing the parts low.

Hereinafter, embodiments of the present invention will be described based on examples shown in FIGS.
First, in FIGS. 1 (a) and 1 (b), (a) is an AC / DC operation type electromagnetic contactor, and (B) is an AC / DC operation type electromagnetic contactor, with some parts being changed. The assembly structure of a direct-current operation type electromagnetic contactor is shown.
Here, the AC / DC operation type electromagnetic contactor has a vertically divided structure as described above, the lower frame 2 of the main body case 1 has a fixed core 4 for the operating electromagnet 4, the operating coil 6, and the bottom of the frame has a rectifier and excitation control. An electronic circuit unit 11 for driving a coil combined with a circuit (IC) is connected to the upper frame 3 with a contact mechanism comprising a contact holder 8, a movable contact 9 and a fixed contact 10, and the contact holder 8. An electromagnet movable core 5 is incorporated, and the upper frame 3 is placed on the lower frame 2 and connected between them by bolts (not shown). In addition, the external view of this electromagnetic contactor is shown to FIG. 2, FIG. 4 (a), (b).

On the other hand, in the DC operation type electromagnetic contactor of FIG. 1 (b) constructed by using the AC / DC operation type electromagnetic contactor as a base without adopting the electronic circuit unit 11, the lower frame 2 in FIG. The upper frame 3, the contact opening / closing mechanism incorporated in the upper frame 3, and the movable core 5 of the operating electromagnet are used as common parts, and the fixed core 4 of the electromagnet in which the lower frame 2 is wound with the operating coil 6 having a DC operation type specification. , And an intermediate frame 12 is added between the lower frame 2 and the upper frame 3, and the upper, middle, and lower frames are joined together by bolts. Shown in (a), (b).
Here, the intermediate frame 12 is a rectangular tube as shown in FIGS. 6A and 6B, and the height thereof is the fixed core 4 mounted on the AC / DC operation type electromagnetic contactor of FIG. 1A. The height is set to complement the difference between the height of the fixed core and the height of the fixed core mounted on the DC-operated electromagnetic contactor of FIG. Further, a thick wall portion 12a protruding up and down is formed on one side surface of the peripheral wall, and an external connection terminal 12b for the coil of the operation electromagnet is provided here. Reference numeral 12c denotes a bolt through hole for connecting the frames.

In order to assemble this DC operation type magnetic contactor, the fixed core 4 having the operation coil 6 wound around the lower frame 2 is assembled, and then the intermediate frame 12 is stacked on the lower frame 2, and the intermediate frame 12 is placed at this position. The lead wire of the operation coil 6 is connected to the external connection terminal 12 b provided on the frame 12. Further, the upper frame 3 on which the above-mentioned shared parts are mounted is superimposed on the intermediate frame 12, and in this state, the upper frame 3, the intermediate frame 12, and the lower frame 2 are integrally fastened through bolts.
As can be seen from the above description, the AC / DC operation type magnetic contactor is used as a base, the operation electromagnet coil 6 and the fixed core 4 are replaced with DC operation type specification parts, and an intermediate frame 12 is additionally provided in the main body case. Thus, the DC operation type electromagnetic contactor can be configured by sharing other components. As a result, the AC / DC operation type electromagnetic contactor and the DC operation type electromagnetic contactor can be manufactured at low cost while keeping the investment required for changing the parts low.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an assembly structure diagram of an electromagnetic contactor according to an embodiment of the present invention, and FIGS. External perspective view of the AC / DC dual operation type electromagnetic contactor shown in FIG. FIG. 1B is an external perspective view of the DC-operated electromagnetic contactor shown in FIG. It is an external view of the AC / DC operation type electromagnetic contactor shown in FIG. 1 (a), (a) and (b) are a front view and a side view, respectively. FIG. 1B is an external view of the DC-operated electromagnetic contactor shown in FIG. 1B, where FIG. 1A and FIG. FIGS. 1A and 1B are structural views of an intermediate frame in the DC operation type magnetic contactor of FIG. Cross-sectional view of a standard AC-operated electromagnetic contactor Cross-sectional view of a standard DC-operated electromagnetic contactor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body case 2 Lower frame 3 Upper frame 4 Fixed core of operation electromagnet 5 Movable core 6 Operation coil 8 Contactor holder 9 Movable contactor 10 Fixed contactor 11 Electronic circuit unit 12 Intermediate frame 12b External connection terminal

Claims (3)

In an electromagnetic contactor equipped with an operating electromagnet, a contact holder connected to the movable core of the electromagnet, a movable contact, and a fixed contact in a vertically divided main body case,
The lower frame and upper frame constituting the main body case, contact holders mounted on the upper frame, movable contacts, a contact mechanism including a stationary contact, and a movable core of an operating electromagnet are used as common parts.
When configuring an AC / DC operation type magnetic contactor, the upper frame is placed on the upper frame on the lower frame on which the operating electromagnet fixed core wound with the coil and the electronic circuit unit for driving the coil are mounted. A direct connection between
When constructing a DC operation type magnetic contactor, install a fixed core of an operation electromagnet with a coil that is a DC operation type specification on the lower frame, and place it between the upper frame and the lower frame. An electromagnetic contactor constructed by interposing a frame. The electromagnetic contactor according to claim 1, wherein the height of the intermediate frame is set to a size that complements the difference in height between the fixed core employed in the AC / DC operation type and the fixed core employed in the DC operation type. Characteristic electromagnetic contactor. The electromagnetic contactor according to claim 1, wherein an external connection terminal of an operation coil is provided on the intermediate frame.