CN88203791U

CN88203791U - Over-load protector

Info

Publication number: CN88203791U
Application number: CN 88203791
Authority: CN
Inventors: 张鹤林
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-02-25
Filing date: 1988-02-25
Publication date: 1988-11-23

Abstract

The utility model discloses an over-load protector, belonging to the technical field of the thermorelay. The over-load protector is assembled by a U-shaped bimetallic strip which is provided with a control rod, a metal rod which is controlled by the control rod, a movable contact, a static contact and a resetting manual push rod which is arranged on an insulating casing, and the metal rod can be self-locking for positioning. The over-load protector has the advantages of small size and simple structure, and the over-load protector is suitable for the overload protection for a middle-power motor and a low-power motor.

Description

Over-load Protector

The utility model belongs to the improvement of thermal relay.

Existing thermal relay is of a great variety, but or sensitivity on the low side, or structure more complicated.

Inventor's purpose is to invent a kind of with low cost and overload protective device of being active in one's movements.

Principle of the present utility model such as Fig. 1.Suppose that line load is single-phase small power motor (G); heating wire (R) is connected in the power circuit; when the heat that sends on the heating wire (R) makes near it U-shaped bimetal leaf (P) that deformation take place; insulation control lever (Z) control metal spring leaf (H) action; make moving contact (DK) and fixed contact (QK) disconnect; contactor (J) discharges mains switch (K), and motor (G) is protected.

Making characteristics of the present utility model are and will the U-shaped bimetal leaf (P) of control lever (Z) be housed, heating wire (R), the lock-bit metal spring leaf (H) that moving contact (DK) is housed of controlled bar (Z) control, fixed contact (QK), insulation crust (W) and the manual push rod (T) that resets that is contained on the insulation crust (W) combine.One of embodiment can be as Fig. 2, shown in Figure 3.

The general available resistance wire of heating wire (R) (as nickel filament) is made.General coiled, and preferably should be installed near the knee of U-shaped bimetal leaf (P), its distance is selected between 0.2mm～3mm, and more then sensitivity is high more for distance.And preferably be installed in the inboard of crooked bimetal leaf (P).

Control lever (Z) on the U-shaped bimetal leaf (P) can directly utilize a part of bending of bimetal leaf to make, but in order to make bimetal leaf (P) not charged when working, the most handy insulating material riveting is contained on the bimetal leaf (P).

The metal spring leaf (H) that the energy lock-bit of moving contact (DK) is housed is answered the control of controlled bar (Z), and its manufacture method belongs to known technology.It makes embodiment can be as shown in Figure 4.(C) is H shape groove among the figure, and (B) is semicircle elastic positioning card.(S) is the room pin.(H) and (B) all is stamped to form by sheet brass or p-cu peel.

Fixed contact (QK) available silver material is made.In order to regulate the contact pressure between it and the moving contact (DK), can make the screw adjustable type.

The manual push rod (T) that resets is made up of insulating bar (T1) and stage clip (T2).Its outer tip end can be loaded onto reset button (N).

Utilization known technology and trial production can be determined the specification of heating wire (R) at last, it according to the specification of U-shaped bimetal leaf (P), apart from U-shaped bimetal leaf (P) distance, full-load current and transship operating current and decide.

This overload protective device is simple in structure, and is with low cost, and volume is little, highly sensitive, in being suitable for very much, low power single-phase or threephase motor, for the single-phase motor of small-power, can also save A.C. contactor and directly uses, easily.

Claims

1, a kind of overload protective device; it is characterized in that it is by the U-shaped bimetal leaf [P] that insulation control lever [Z] is housed; be contained near the heating wire [R] in U-shaped bimetal leaf [P] knee; the lock-bit metal spring leaf [H] that moving contact [DK] is housed of the control lever [Z] that insulated control, reset manual push rod [T] and the fixed contact [QK] that are contained on the insulation crust [W] combine.