JPS61203516A - Electric switch mechanism - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electric switching mechanism used in relays, electromagnetic switches, breakers, etc.

(Prior art and its problems) Conventionally, the contacts of electrical switching mechanisms used in relays, electromagnetic switches, breakers, etc. are the same for both closing and opening. For example, as shown in Fig. 4 (contacts Lr and Lt in a plunger-type normally open two-point electromagnetic switch both serve as a closing contact and a disconnecting contact. Therefore, contacts L1 and L2 Even if a contact material with high welding resistance such as Ag-Cd0 is used as a contact material, as the number of openings and closings increases due to the arc discharge that occurs during opening, a contact other than Ag-Cd0 such as Ag-rich will appear on the contact surface. In addition, this substance formed on the contact surface causes high and unstable contact resistance, accelerates wear and causes welding accidents, and causes trouble in the electrical switching mechanism. It was a contributing factor to this.

(Object of the invention) The present invention has been made to solve the above problems,
By separating the contacts for closing and opening and using the required contact material for each contact, it is possible to improve welding resistance, stability of contact resistance, and wear resistance. The purpose is to provide an opening/closing mechanism.

(Structure of the Invention) The electrical closing mechanism of the present invention has a closing contact and a breaking contact, and when the closing contact is closed, electricity flows in the circuit, and when the breaking contact is opened, electricity flows in the circuit. This was done so that the flow would no longer occur.

In this way, the electric switching mechanism of the present invention has separate closing contacts and opening contacts, so the closing contact has Ag-Cd.
Use contact materials with high welding resistance such as O5Ag-3nOz, Ag-W, Ag-C, and use Ag-CdOl for the opening contact.
Ag-3nO□, Ag.

By using a highly wear-resistant contact material such as Ag-Ni or Ag-Cu, welding resistance, stability of contact resistance, and wear resistance can be further improved.

(Example) Example 1.2 of the electric switching mechanism of the present invention and a conventional example will be described.

Embodiment 1 Of the contacts M+ and Ml in the normally open two-point electromagnetic switch shown in FIG. The contact M2 is the opening contact M.

As shown in the timing chart of FIG. 2, there is a time delay td. Therefore, when closing, the breaking contact M1 closes first, after td, the closing contact M2 closes, and when breaking, the breaking contact M1 closes first.

is opened first, and after td, the closing contact M2 is opened.

Note that A in the circuit of FIG. 1 is a power supply, and B is a load.

Embodiment 2 In this embodiment, the opening contact M and closing contact M2 of the previous embodiment were arranged in series in the circuit, but were arranged in parallel as shown in the circuit of FIG. At the time of closing, the closing contact M2 is closed first, and the opening contact M is closed after td, and when opening, the closing contact M2 is opened first, and the opening contact M is opened after td. Note that A in the circuit of FIG. 3 is a load.

However, Ag was used for the contact material of the opening contact M of the electrical switching mechanism of Example 1 shown in FIG. 1, and Ag-Cd0 was used for the contact material of the closing contact M2. Contact M
, the time delay td for , is 0.1 s e c, while the contact L
A welding resistance test was conducted under the following test conditions using Ag-Cd0 as the contact material of Lx, and the results shown in Table 1 below were obtained.

Test conditions Voltage: AC200v Current: Rush current 75A (0.1 seconds) Steady 15A (1
(seconds) Opening/closing frequency: 20 times/minute Force rate: 0.5 Contact force: 100g Opening force: 200g Table 1 Next, the contacts of the opening/closing contact M of the electric switching mechanism of Example 2 shown in Fig. 3 Ag-C is used for the contact material, Ag is used for the contact material of the closing contact M2, and the time delay td of the closing contact M2 with respect to the opening contact M is 0.1 sec. A wear resistance test was conducted under the same circuit conditions as above using Ag-C as the contact material for the contacts Lt and Lx of the electrical switching mechanism in this example, and the results shown in Table 2 below were obtained.

As is clear from Tables 1 and 2 above, the electrical switching mechanisms of Examples 1 and 2 require significantly more switching times before welding occurs than the conventional electrical switching mechanisms, and the amount of contact wear is extremely high. It turns out that there are few.

(Effects of the Invention) As detailed above, the electric switching mechanism of the present invention has separate contacts for closing and opening, and when the closing contact is closed, electricity flows through the circuit, and the opening contact is opened. By using a contact material with the required properties for each contact, contact resistance can be reduced because no foreign contact material is formed on the contact surface. It has excellent effects such as being able to maintain a low and stable arc consumption, significantly reducing arc consumption and improving wear resistance, and greatly increasing the number of openings and closings before welding occurs, improving welding resistance. .

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing an example of the electric switching mechanism of the present invention, Fig. 2 is a timing chart diagram of closing contacts and opening contacts in the electric switching mechanism of the present invention, and Fig. 3 is a circuit diagram showing an example of the electric switching mechanism of the present invention. A circuit diagram showing another example of the mechanism. FIG. 4 is a circuit diagram showing a conventional electric switching mechanism. Applicant Tanaka Kikinzoku Kogyo Co., Ltd. Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] An electrical switching mechanism having a closing contact and a breaking contact, in which electricity flows through the circuit when the closing contact is closed, and no electricity flows through the circuit when the disconnecting contact is opened.