JPH0590784U - Contact mechanism of electromagnetic contactor - Google Patents

Abstract

(57) [Summary] [Structure] The other movable contact 19b that comes into contact with the fixed contact 9a in advance and interrupts the volume of the movable contact 19a in advance and interrupts it, and interrupts the fixed contact 9a later in time. The volume ratio to the volume is about 3: 1. In this case, the movable contact 17
A pair of legs 17a and 17b having a width dimension of about 3: 1 is formed in the slit, and the leg portion 17a on the side with the larger width dimension is contacted and cut off in advance. The movable contact 19a is attached, and the foot 17 on the side with the smaller width is attached.
Moving contact 1 that comes into contact with b and comes into contact with and cuts off after 1
Install 9b. [Effect] The movable contact 19 that is turned on and off first
Since the volume of a is about 1.5 times that of the conventional one, the electrical life is greatly improved.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a contact mechanism of an electromagnetic contactor having improved electrical life of the contact.

[0002]

[Prior Art]

 FIG. 3 shows a sectional view of a conventional electromagnetic contactor. In the figure, reference numeral 1 is a case made of an insulating material, in which a fixed iron core 2 and a movable iron core 3 are housed. A coil 4 is wound around the leg portion of the fixed iron core 2, and a magnetic force is generated by applying a voltage to the coil 4 so that the fixed iron core 2 attracts the movable iron core 3. The movable iron core 3 is fixed to the movable contactor base 6 by the pin 5, and the movable contactor base 6 also operates in conjunction with the operation of the movable iron core 3. A window 6a is formed in the movable contact table 6, and a movable contact 7 pressed by a main contact spring 6b is arranged in the window 6a. The movable contactor 7 is mounted so as to be movable in the same direction as the moving direction of the movable iron core 3, and the fixed contactor 9 fixed to the fixed contactor base 8 corresponding to the operation of the movable iron core 3 is fixed. It contacts with the contact 9a and opens.

FIGS. 4A and 4B are a front view and a plan view of a conventional movable contactor 7, and FIG. 5 shows a state in which the movable contactor 7 is attached to a movable contact base 6. 6A to 6C show the operating states of the movable contacts 7a and 7b of the movable contactor 7. The movable contactor 7 has a strip shape bent so as to have a depression in the central portion in the longitudinal direction, and a slit portion 10 having a constant width is provided on both end sides along the longitudinal direction. The legs 7a and 7b are formed. Movable contacts 11a and 11b of the same size are attached to the tips of the legs 7a and 7b, respectively, to form twin contacts. As shown in FIG. 5, the movable contactor 7 is attached to the slanted edge of the window portion 6a of the movable contactor base 6 together with the spring bearing 12 so as to be able to move up and down. A main contact spring 6b that applies a contact pressure to the movable contacts 11a and 11b is arranged between the movable contact 7 and the spring receiver 12, whereby the movable contact 7 is inclined to match the inclined edge. Is in a state.

Next, the operation of the movable contact 7 will be described with reference to FIGS. 6A to 6C. The movable contactor 7 is inclined by being pressed against the inclined edge portion by the main contact spring 6b arranged in the window 6a of the movable contactor stand 6 until just before the movable contacts 11a and 11b contact the fixed contact 9a. Is in a state. Immediately after the movable contacts 11a and 11b contact the fixed contact 9a, one movable contact 11a first contacts the fixed contact 9a, and then the other movable contact 11b delays and contacts the fixed contact 9a. The operation is reversed when the contact is opened.

[0005]

[Problems to be solved by the device]

 In the contact mechanism of the electromagnetic contactor configured as described above, the contact is two-point contact, and the movable contact 11a, 11b is fixed to the fixed contact 9a by the inclined edge of the window 6a of the movable contact base 6. After the contact with the movable contact 7 is slightly shifted in the width direction of the movable contactor 7, high contact reliability can be obtained.

However, in this contact mechanism, the movable contact 7a is closed and closed only on one side, so that the movable contact 7a wears faster than the other movable contact 7b due to the arc current at the time of closing and closing. In the worst case, the movable contact 7a disappears and only the base metal is turned on and off, and the base metal melts and melts. The present invention has been made in view of the above points, and an object thereof is to provide a contact mechanism of an electromagnetic contactor capable of improving the electrical life.

[0007]

[Means for Solving the Problems]

 The present invention relates to a contact mechanism of an electromagnetic contactor which has a movable contact that comes into contact with a fixed contact in advance and interrupts it in advance, and a contact mechanism of an electromagnetic contactor that has a movable contact that comes into contact with the stationary contact and interrupts after the contact. It is characterized in that the ratio of the volume of the movable contact which comes into contact with the other movable contact and which is cut off in advance and the volume of the other movable contact is set to about 3: 1.

Further, a slit is formed on the movable contact to form a pair of legs having a width dimension of about 3: 1, and the foot on the side with the larger width dimension precedes the fixed contact. A movable contact that comes into contact with and cuts off first is attached, and a movable contact that comes into contact with the foot on the side of the smaller width and that comes off later is attached to make contact first and lead first. It is characterized in that the ratio of the volume of the movable contact to be interrupted by the other and the volume of the other movable contact is set to about 3: 1.

[0009]

[Action]

 With the above-mentioned configuration, the volume of the movable contact that is turned on and off in advance is about 1.5 times that of the conventional one, so that the electrical life is greatly improved.

[0010]

【Example】

 An embodiment according to the present invention is shown in FIGS. 2 (a) and 2 (b) are a front view and a plan view of the movable contactor 17 used in the contact mechanism of the present invention. The movable contactor 17 has a band shape bent so that the central portion in the longitudinal direction is recessed. The slits 18 are formed on both end sides along the longitudinal direction. The slit portion 18 is arranged at a position where the width of the movable contactor 17 is divided into about 3: 1, and the widthwise dimension ratio of the foot portions 17a and 17b formed by the slit portion 13 on both sides thereof. Is similarly formed in a ratio of about 3: 1. Movable contacts 19a and 19b are attached to the tip ends of the feet 17a and 17b, respectively, and these movable contacts 19a and 19b are fitted to the widthwise dimension ratio of the feet 17a and 17b by the slit portion 18. The volume ratio is approximately 3: 1.

The movable contactor 17 configured as described above is incorporated in the movable contactor base in the same manner as the conventional contactor shown in FIGS. 3 and 5, and is inclined together with the spring bearing due to the inclination of the window portion of the movable contactor base. Are arranged in a state and contact pressure is applied by the main contact spring.

The operation of this embodiment will be described with reference to FIGS. 1 (a) to 1 (c). Until the movable contacts 19a, 19b contact the fixed contact 9a, the movable contact 17 is inclined by being pressed against the inclined portion on the lower surface of the window by the main contact spring arranged in the window of the movable contact base. is there. Immediately after the contact, one movable contact 19a first contacts the fixed contact 9a, and then the other movable contact 19b delays and contacts the fixed contact 9a to complete the closing operation. At this time, the contact is a two-point contact, and the movable contact 19a which is in contact in advance when moving from the inclined state to the parallel state slightly slides in the width direction of the movable contact 17, so that the contact reliability becomes high. In addition, the volume ratio of the movable contact 19a that comes in contact with the preceding contact and the movable contact 19b that comes in late contact is approximately 3: 1, which is 1.5 times that of the conventional case, and therefore the electrical life is extended. The movable contacts 19a and 19b are cut off from the fixed contacts 9a in the opposite manner to the closing operation.

[0013]

[Effect of the device]

 As described above, according to the present invention, the ratio of the volume of the movable contact that comes in contact with and cuts off first and the volume of the other movable contact is set to approximately 3 to 1, so that the electrical life is increased. It is possible to provide a contact mechanism of an electromagnetic contactor having improved characteristics.

[Brief description of drawings]

FIG. 1 is a state diagram showing a time-dependent operation of a movable contact of a movable contactor used in a contact mechanism of an electromagnetic contactor according to the present invention.

2A is a front view showing an embodiment of a movable contactor used in a contact mechanism of an electromagnetic contactor according to the present invention, and FIG. 2B is a plan view thereof.

FIG. 3 is a sectional view showing a general electromagnetic contactor.

FIG. 4A is a front view showing a conventional movable contactor;
(B) Plan view

5 is a sectional view showing a state in which the movable contactor shown in FIG. 4 is attached to a movable contactor base.

6A to 6C are state diagrams showing a time-dependent operation of a movable contact of a conventional movable contactor.

[Explanation of symbols]

9a is a fixed contact, 17a and 17b are feet of a movable contactor,
Reference numeral 19a denotes a movable contact which comes in contact with and cuts off first, and 19b denotes a moving contact which comes in contact with the trailing and breaks after the contact.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Takuya Hayakawa 2-24-1 Harumi-cho, Fuchu-shi, Tokyo Toshiba FA System Engineering Co., Ltd. In-house

Claims (2)

[Scope of utility model registration request] 1. A contact mechanism of an electromagnetic contactor having a movable contact which comes into contact with and is cut off from a fixed contact in advance, and a movable contact which comes into contact with and comes out of contact with a fixed contact later. A contact mechanism for an electromagnetic contactor, characterized in that the ratio of the volume of a movable contact that comes in contact with and cuts off first is set to approximately 3: 1. 2. A pair of legs having a slit portion formed on the movable contact and having a width dimension of about 3: 1, and a pair of legs having a larger width dimension precedes the fixed contact. A movable contact that comes into contact with and cuts off in advance, and a movable contact that comes in contact with the foot on the side of the smaller width and that comes into contact with the foot later is attached, A contact mechanism for an electromagnetic contactor, characterized in that the ratio of the volume of a movable contact that is cut off in advance and the volume of the other movable contact is set to approximately 3: 1.