JPS58175220A - Electric contactor - 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 [Technical Field of the Invention] The present invention relates to a switching device of an air extinguishing type for an electromagnetic contactor and an electromagnetic relay, which has at least 41 pairs of contacts that open and close, and which connects an electric circuit. I[Relates to electrical contacts that open and close directly.

[Technical background of the invention]

Electrical contacts, which are generally used in electric relays that close and close electric circuits in the air, have at least one pair of identified, movable contacts that energize, open and close the circuit. have. When the electrical contact is in a closed circuit state, it is desirable that the vibration resistance between the contacts be small and that a stable over-contact state can be ensured over a long period of time. Here, djI? , reveal.

11, it is inserted into a window of a movable frame 1 made of an insulating material, is held pressed against one side of the window via a Weig spring 2, and is attached to the inner end of the movable alarm 3 and this O1 movable contact 3. ljJ consisting of movable contacts 4 and 4' fixed by silver soldering 1, etc.
Electric contacts for animals are popular. This l1iJ moving contact 3 has a large number of clJ moving frames 1 (not shown) suspended from it.
- By attracting the moving core through the mouth of the magnet, the fixed contacts 5, 5' and the movable contacts 4, 4', which are attached by brazing or the like, are connected to the electric contacts 6, 6' on the fixed construction side. let' touch and form an electrical path. Conventional electrical contacts in such electrical contacts include electrical contacts 41. as shown in an enlarged view in FIG. The contact rkJ of j usually has a relatively very smooth surface as an electrical contact, even for mechanically processed pipes such as rolling, press processing, and machine processing. The electrical grade of general switchgear is used either with this processed surface or with silver plating applied to this surface.

[Background technology study points]

If the product is used with such a contact surface, the spring force of the Weig spring 2 shown in Figure 1 may be weak, the spring force may have weakened due to aging, or the movement may not be smooth for some reason. If the contact force between the electrical contacts decreases due to this reason, the contact resistance increases as the variation in contact resistance increases. When the contact resistance becomes high, contact reliability is significantly reduced due to the heat generated by the current flowing through the contacts, which increases wear and tear on the contacts, causing welding and poor contact.

[Object of the Invention] The present invention eliminates the above-mentioned drawbacks, reduces the contact resistance of electrical contacts such as electromagnetic contactors that make contact with a constant vibration pressure, and provides contact reliability that allows the contact energization state to be maintained stably over a long period of time. The purpose is to provide a durable electrical contact.

CIA#4o Example] Hereinafter, an example of the present invention will be explained with reference to Example (3). In No. 3-, the movable contacts 4, 4 of the positive contacts 5, 5'
910 to 25 protrusions per minute are formed almost uniformly on the surface that vibrates, and the height of these protrusions is approximately 3 to 15 μm.
The surface is formed with the dimensions of tNt-) and has an unevenness tNt-). In this way, in the closed state, the oJ moving contacts 4, 4' vibrate via the uneven surface of (6) the constant contacts 5, 5'. This is because the protrusions of the identification contacts 5 and 5' are deformed by the shaking pressure, resulting in a large number of contact points and a wide contact area. As a result, as shown in Figure 5, the relationship between shaking pressure and contact resistance is much higher in the case of the one-shot contactor according to the present invention shown in B than in the conventional one shown in A, and the contact resistance is The contact energization state is stable and the contact reliability is improved.

Unexploded BA#-i, not added to the above shape, has the same characteristics as shown in Figure 5 by forming protrusions similar to those above and creating an uneven surface on the contact surface of the movable dot. I can do it.

In addition, as shown in Fig. 4, the same protrusions as described above are formed on the contact surfaces of both the movable contacts 4, 4' and the identification contacts 5, 5', and the surfaces with unevenness are formed. If the contacts are crossed and brought into contact with each other at an angle of 30 DEG to 1,500 DEG to 1,500 DEG relative to the plane of relative contact, the same effect as shown in FIG. 5 can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, the movable contact error is (6
) By providing a fine and uniform uneven surface on at least one contact surface of the fixed contact and bringing the movable contact and the positive contact into contact,
It is possible to provide a contact with low contact resistance, stable contact energization over a long period of time, and high contact reliability.

[Brief explanation of the drawing]

Figure 8141 is a front view showing a conventional general 11 wax contactor, Figure #12 is a sectional view showing the m thread surface of a conventional electric contact, and Figures 3 and 4 are from this book. FIG. 5 is a view showing the contact surface of the electric contact of the electric contactor according to the invention, and FIG. 5 is a characteristic diagram showing the relationship between the I contact force and the contact resistance of the electric vibrator of the conventional and the present invention. J...Movable contact 14, 4'...=T moving contact, 5
．． 5'...Identification contact, C...Identification contact. Applicant's agent Patent attorney Takehiko Dane No. 1

Claims (2)

[Claims] (1) In an electrical contact having at least one pair of identification and movable contacts, at least one contact surface of the identification and movable contacts has a height dimension of 1-25 3 to 155111 An electrical contact characterized by forming protrusions. (2) The electrical contact according to claim 1, characterized in that the identification and movable contacts are brought into contact with each other at an extra-large relative contact plane angle of 30° to 150°.