JPH0617079U - Switch - Google Patents

Abstract

(57) [Abstract] [Purpose] In a switch that has a main contactor and an auxiliary contactor that can be contacted and separated, an arc is created between the main contacts at the moment when the main contactor separates when the circuit current is interrupted. Try not to generate it. [Structure] The fixed auxiliary contactor 3 is made up of three parts 3a, 3b, 3c made of a material having a sequentially higher resistance, and the movable auxiliary contactor 4 is made of two parts 4a, 4b made of a material having a successively higher resistance. And the auxiliary contacts 3 and 4 from the energization between the main contacts 1 and 2 during the open circuit when the circuit current is cut off.
Then, the energization contact between the auxiliary contacts 3 and 4 is made to be the contact between the parts 3a and 4a → the parts 3b and 4
The resistance between the auxiliary contacts 3 and 4 is increased by changing the order of contact of a → contact of part 3c and part 4a → contact of part 3c and part 4b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a switch having a function of interrupting current in an electric circuit.

[0002]

[Prior art]

 As shown in FIG. 3, a switch having a main contactor and an auxiliary contactor is generally a fixed main contactor 11 which is entirely made of the same material, and the same material as that of the fixed main contactor 11 as a whole. A movable main contact 12 made of the same different material, a fixed auxiliary contact 13 made entirely of the same material, and a movable auxiliary made entirely of the same material as or different from the material of the fixed auxiliary contact 13. It is composed of the contactor 14. Reference numeral 5 is a spring that presses the fixed main contact 11 toward the movable main contact 12. In the switch having the conventional main contactors 11 and 12 and auxiliary contactors 13 and 14, when the current of the electric circuit is interrupted, the current flows from the main contactors 11 and 12 to the auxiliary contactors 13 and 14. , And the current was cut off.

[0003]

[Problems to be solved by the device]

 In the switch having the conventional main contacts 11 and 12 and auxiliary contacts 13 and 14, the transfer of the current from the main contacts 11 and 12 to the auxiliary contacts 13 and 14 is fixed. Before the movable auxiliary contact 14 and the movable auxiliary contact 14 are brought into contact with each other, the fixed main contact 11 and the movable main contact 12 are brought into contact with each other. In this case, the main contacts 11 and 12 have a low resistance in order to improve the current-carrying performance, while the auxiliary contacts 13 and 14 use a material excellent in arc resistance and cut off the current. In order to improve the performance, the resistance was increased within the range where the current can be transferred. Therefore, when the fixed main contact 11 and the movable main contact 12 come into contact with and separate from each other and the current moves to the auxiliary contacts 13 and 14, the resistance change becomes large as shown by the alternate long and short dash line in FIG. There is a drawback that an arc is generated at the moment when the main contact 11 and the movable main contact 12 come into contact with each other and the surfaces of the fixed main contact 11 and the movable main contact 12 are roughened.

Therefore, according to this invention, in a switch having a main contactor and an auxiliary contactor, the resistance between the auxiliary contactors gradually increases as the movable main contactor moves while sliding with the fixed main contactor. By doing so, the difference between the resistance between the main contacts and the resistance between the auxiliary contacts can be reduced, and when the fixed main contact and the movable main contact come into contact with and separate from each other when the current is cut off, this main contact It is designed so that no arc is generated between them.

[0005]

[Means for Solving the Problems]

 In the invention of claim 1, the material of the portion of the fixed auxiliary contact that makes sliding contact with the movable auxiliary contact is sequentially changed so that the resistance between the auxiliary contacts gradually increases as the switch opens. Let In the invention of claim 2, the material of the portion of the movable auxiliary contact that makes sliding contact with the fixed auxiliary contact is sequentially changed so that the resistance between the auxiliary contacts increases as the switch opens. Let In the invention of claim 3, the material of the fixed auxiliary contact and the movable auxiliary contact which are in sliding contact with each other so that the resistance between the auxiliary contacts gradually increases as the switch opens. Are changed sequentially.

[0006]

[Action]

 In the switch of the present invention configured as described above, the difference between the resistance between the main contacts and the resistance between the auxiliary contacts immediately before the current is transferred from the main contacts to the auxiliary contacts is small. Therefore, at the moment when the main contacts come into contact with or separate from each other when the current is cut off, no arc is generated between the main contacts and the current is transferred from the main contacts to the auxiliary contacts.

[0007]

【Example】

 An embodiment of the present invention will be described below in detail with reference to FIGS. 1 and 2. FIG. 1 is a contact portion of an example of a switch of the present invention, in which a fixed auxiliary contact 3 and a movable auxiliary contact 4 are composed of parts 3a, 3b, 3c and parts 4a, 4b, respectively. The resistance between the children 3 and 4 is made of various kinds of current-carrying materials so that the resistance gradually increases as the switch opens. That is, the portion 3b is made of a conducting material having a higher resistance than the portion 3a, the portion 3c is made of a conducting material having a higher resistance than the portion 3b, and the portion 4b is made of a conducting material having a higher resistance than the portion 4a. For example, the parts 3a and 4a may be made of pure steel, the parts 3b and 4b may be made of pure copper with 10% tungsten, and the part 3c may be made of pure copper with 15% tungsten. The parts 3a and 4a, and the parts 3b and 4b do not necessarily have to be formed of the same material.

FIG. 1 shows the positions of the auxiliary contacts 3 and 4 at the closing position of the switch, but when the circuit current is cut off, the movable main contact is operated by an operating mechanism not shown in the drawing. The child 2, the movable auxiliary contactor 4, etc. are moved in the arrow direction. At this time, the movable main contact 1 moves in the direction of the arrow, the fixed main contact 1 is pressed by the spring 5 toward the movable main contact 2, and the movable auxiliary contact 4 moves in the direction of the fixed auxiliary contact 3 by itself. Since the current is applied between the main contacts 1 and 2, the current is switched to the current between the auxiliary contacts 3 and 4, and then the fixed auxiliary contact 3 and the movable auxiliary contact 4 are brought into sliding contact. The portions to be changed sequentially change to a portion 3a and a portion 4a → a portion 3b, a portion 4a → a portion 3c, a portion 4a → a portion 3c and a portion 4b, and then the contacts are opened. The change in resistance at that time is shown by the solid line in FIG. When the fixed main contact 1 and the movable main contact 2 are in contact with each other, the resistance is R1, when the part 3a and the part 4a are in contact with each other, the resistance R2, when the part 3b and the part 4a are in contact with each other, and when the part 3c and the part 4a are in contact with each other. When the resistance R4 is the resistance R5 when the portion 3c and the portion 4b are in contact with each other, the relationship of R1 <R2 <R3 <R4 <R5 is satisfied. Therefore, the difference between the resistance between the main contacts 1 and 2 and the resistance between the auxiliary contacts 3 and 4 immediately before the current is transferred from between the main contacts 1 and 2 to between the auxiliary contacts 3 and 4 becomes small. It is possible to prevent the generation of an arc between the main contacts 1 and 2.

In the above embodiment, the fixed auxiliary contact 3 and the movable auxiliary contact 4 are different from each other so that the resistance between the auxiliary contacts 3 and 4 gradually increases as the switch opens. Although the material of the sliding contact portion is sequentially changed, the material of only the fixed auxiliary contactor 3 or only the movable auxiliary contactor 4 may be changed.

[0010]

[Effect of device]

 As described above, according to the present invention, since the change in resistance is small, it is possible to shift from energization between the main contacts to energization between the auxiliary contacts without generating an arc between the main contacts.

[Brief description of drawings]

FIG. 1 is a view showing a contact portion of an example of a switch according to the present invention.

FIG. 2 is a diagram showing an example of resistance change between contacts from a closing position of a switch to an opening position.

FIG. 3 is a diagram showing a contact portion of an example of a conventional switch.

[Explanation of symbols]

 1 Fixed Main Contact 2 Movable Main Contact 3 Fixed Auxiliary Contact 3a Part 3b Part 3c Part 4 Movable Auxiliary Contact 4a Part 4b Part 5 Spring 11 Fixed Main Contact 12 Movable Main Contact 13 Fixed Auxiliary Contact 14 Movable Auxiliary Contact

Claims (3)

[Scope of utility model registration request] 1. A fixed main contactor and a movable main contactor capable of connecting and disconnecting a circuit current, and a fixed auxiliary contactor and a movable auxiliary contactor capable of contacting and separating a current flowing by an arc when the circuit current is cut off. In the switch having the switch, the material of a portion of the fixed auxiliary contact that makes sliding contact with the movable auxiliary contact is sequentially changed so that the resistance between the auxiliary contacts increases as the switch opens. 2. A contacting / separating fixed main contact and a movable main contactor for energizing a circuit current, and a contacting / separable fixed auxiliary contact and a movable auxiliary contactor for energizing by an arc when the circuit current is cut off. In the switch having the switch, the material of the portion of the movable auxiliary contact that makes sliding contact with the fixed auxiliary contact is sequentially changed so that the resistance between the auxiliary contacts increases as the switch opens. 3. A fixed main contactor and a movable main contactor capable of contacting and separating for supplying a circuit current, and a fixed auxiliary contactor and a movable auxiliary contactor capable of contacting and separating for supplying current by an arc when the circuit current is cut off. In the switch, the materials of the fixed auxiliary contact and the movable auxiliary contact in sliding contact with each other are sequentially changed so that the resistance between the auxiliary contacts increases as the switch opens. Switch.