CN114242515A

CN114242515A - Overload protector capable of automatically resetting after power failure

Info

Publication number: CN114242515A
Application number: CN202111542511.2A
Authority: CN
Inventors: 李庆春
Original assignee: Suzhou Jun Heng Electric Co ltd
Current assignee: Suzhou Jun Heng Electric Co ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-03-25

Abstract

The invention relates to the field of overload protectors, in particular to an overload protector capable of automatically resetting after power failure, which comprises a shell, an insulating base, a bimetallic strip assembly support, a first connecting rivet, a second connecting rivet, a first connecting terminal and a second connecting terminal, wherein the insulating base is arranged on the shell. The resistance alloy sintered on the ceramic substrate can generate heat more stably, can be automatically reset only by disconnecting the power supply after the overload trip, does not need manual operation, has the advantages of high performance stability, high safety, long service life and the like, is very convenient to use, and has lower cost.

Description

Overload protector capable of automatically resetting after power failure

Technical Field

The invention relates to the field of overload protectors, in particular to an overload protector capable of automatically resetting after power failure.

Background

In order to protect an electric appliance and prevent the electric appliance from being damaged due to overheating caused by load increase or environmental temperature change during use, an overload protector is often installed in the electric appliance. Along with the popularization of electric appliances, overload protectors are commonly used in the electric appliances, such as motors, ballasts, transformers, rechargeable batteries, household appliances, crushers, mixers, electric tools, solar electric appliances and the like, the existing overload protectors are automatic reset or manual reset products, such as automatic reset overload protectors, under the condition of overload, frequent disconnection and reset easily cause over-temperature aging, and the service life of the electric appliances is shortened; if the manual reset overload protector is installed in the electrical equipment, the power supply is cut off when the overload protector is reset, and the manual reset mode is adopted, namely, the electrical equipment shell is opened, and the overload protector is reset by pressing a reset button by hand. Therefore, ordinary non-professional personnel can not operate the device, and the device needs to be sent to a professional maintenance department for repair, so that the device is very inconvenient and practical. The general overload protector has poor response sensitivity to low overload.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides the overload protector which has high performance stability and high safety and can automatically reset after power failure.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: an overload protector capable of automatically resetting after power failure comprises a shell, an insulating base, a double-metal-sheet-component support, a first connecting rivet, a second connecting rivet, a first connecting terminal and a second connecting terminal, wherein the insulating base is arranged on the shell, resistance alloy is sintered on the insulating base, through holes are formed in two ends of the insulating base, the double-metal-sheet-component support penetrates into a middle hole of the insulating base to be riveted and fixed, the double-metal-sheet-component support is connected with one end of the resistance alloy, a stationary contact is arranged in the through hole in one end of the insulating base, the first connecting terminal is arranged on a stationary contact sleeve through riveting and fixing, the stationary contact is connected with the other end of the resistance alloy, the second connecting rivet penetrates into the other end hole of the insulating base, the second connecting terminal is arranged on the second connecting rivet sleeve through riveting and fixing, the first connecting rivet is pressed into a center hole of the double-metal-sheet-component support, the first connecting rivet is welded with a bimetallic strip and a heating element, the other end of the bimetallic strip is welded with a movable contact, and the other end of the heating element is welded with the second connecting rivet.

In order to facilitate the connection of the wires, the invention has the improvement that the first wiring terminal and the second wiring terminal are provided with wire grooves.

In order to improve the insulation effect, the invention has the improvement that the insulation base is made of ceramic materials, and the shell is made of plastic materials.

In order to improve the use effect of the first connecting rivet and the second connecting rivet, the first connecting rivet, the second connecting rivet and the bimetallic strip are made of copper.

In order to improve the use stability of the fixed contact and the movable contact, the invention improves that the surfaces of the fixed contact and the movable contact are provided with gold coatings.

In order to fix the wires conveniently, the invention is improved in that the first wiring terminal and the second wiring terminal are provided with limiting covers, fastening pads are arranged in the limiting covers, limiting plates are arranged on two sides of the wire groove, and the limiting covers are connected with the limiting plates through fixing bolts.

In order to conveniently install the shell, the invention has the improvement that fixing holes are formed in two ends of the insulating base, and the shell is connected with the fixing holes through mounting bolts.

(III) advantageous effects

Compared with the prior art, the invention provides an overload protector capable of automatically resetting after power failure, which has the following beneficial effects:

the automatic power-off reset overload protector is simple in structure and easy to operate, and is more sensitive to low overload protection due to the fact that the heating element is connected with the bimetallic strip in series. The resistance alloy sintered on the ceramic substrate can generate heat more stably, can be automatically reset only by disconnecting the power supply after the overload trip, does not need manual operation, has the advantages of high performance stability, high safety, long service life and the like, is very convenient to use, and has lower cost.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic cross-sectional view of the present invention;

FIG. 3 is an electrical schematic of the present invention;

in the figure: 1. an insulating base; 2. a stationary contact; 3. a first connection terminal; 4. a resistive alloy; 5. a movable contact; 6. a bimetal; 7. a bimetallic strip assembly support; 8. a first connecting rivet; 9. a heating element; 10. a second connecting rivet; 11. a housing; 12. a second connection terminal; 13. a wire guide groove; 14. a limiting plate; 15. a limiting cover; 16. fixing the bolt;

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, the invention is an overload protector capable of automatically resetting after power failure, comprising a housing 11, an insulating base 1, a bimetal block support 7, a first connecting rivet 8, a second connecting rivet 10, a first connecting terminal 3 and a second connecting terminal 12, wherein the insulating base 1 is mounted on the housing 11, a resistor alloy 4 is sintered on the insulating base 1, through holes are formed in two ends of the insulating base 1, the bimetal block support 7 penetrates through a middle hole of the insulating base 1 and is riveted, the bimetal block support 7 is connected with one end of the resistor alloy 4, a stationary contact 2 is arranged in the through hole at one end of the insulating base 1, the first connecting terminal 3 is sleeved on the stationary contact 2 and is riveted, the stationary contact 2 is connected with the other end of the resistor alloy 4, the second connecting rivet 10 penetrates through a hole at the other end of the insulating base 1, the second connecting rivet 10 is sleeved with a second connecting terminal 12 and is fixed through riveting, the first connecting rivet 8 is pressed into a central hole of the bimetallic strip assembly support 7, the bimetallic strip 6 and the heating element 9 are welded on the first connecting rivet 8, the movable contact 5 is welded at the other end of the bimetallic strip 6, and the other end of the heating element 9 is welded with the second connecting rivet 10.

In this embodiment, the first connection terminal 3 and the second connection terminal 12 are provided with a wire groove 13, so that wires can be conveniently connected to the first connection terminal 3 and the second connection terminal 12.

In this embodiment, the insulating base 1 is made of ceramic, and the housing 11 is made of plastic, so as to improve the insulating effect of the present invention.

In this embodiment, the first connecting rivet 8, the second connecting rivet 10 and the bimetal 6 are made of copper, so that the first connecting rivet 8 and the second connecting rivet 10 have conductive effects, and the copper material prolongs the service life of the first connecting rivet 8 and the second connecting rivet 10.

In this embodiment, the surfaces of the fixed contact 2 and the movable contact 5 are provided with gold plating layers, and the gold plating can improve the corrosion resistance of the contacts, which means that they are more suitable for severe environments; the contact is more resistant to plugging and unplugging and is not easy to wear, so that the gold contact is a better choice under the condition of frequent plugging and unplugging; the contact resistance of the gold contact is lower, and the continuity of the gold contact is better.

In this embodiment, be equipped with spacing lid 15 on first binding post 3 and the second binding post 12, be equipped with the fastening pad in the spacing lid 15, the both sides of metallic channel 13 are equipped with limiting plate 14, spacing lid 15 is connected with limiting plate 14 through fixing bolt 16, puts into metallic channel 13 with the wire and installs spacing lid 15 after, under the extrusion of fastening pad, conveniently improves the fixed effect of wire.

In this embodiment, the two ends of the insulating base 1 are provided with fixing holes, and the housing 11 is connected with the fixing holes through mounting bolts, so that the housing 11 is convenient to mount.

In summary, in use, the resistance alloy 4 is sintered on the ceramic base 1, the bimetallic support 7 is inserted into the middle space of the ceramic base 1 for riveting and fixing, the bimetallic support 7 is connected with one end of the resistance alloy 4, one end of the bimetallic strip 6 is welded with the movable contact 5, the other end is welded and fixed with the first connecting rivet 8, then the heating element 9 is welded on the first connecting rivet 8, the fixed contact 2 is inserted into the through hole at one end of the ceramic base 1, the first connecting terminal 3 is sleeved on the fixed contact 2 for riveting and fixing, the fixed contact 2 is connected with the other end of the sintered resistance alloy 4, the second connecting rivet 10 is inserted into the other end of the ceramic base 1, the second connecting terminal 12 is sleeved on the fixed contact, the first connecting rivet 8 is pressed into the central hole of the bimetallic support 7, the movable contact 5 is contacted with the fixed contact 2, the other end of the heating element 9 is fixed with a second connecting rivet 10 by welding, a shell 11 is buckled, and the shell 11 is connected with the insulating base by a mounting bolt.

Because the electrical apparatus works abnormally, cause the ambient temperature to rise, the current increases, when the heat reaches the disconnection temperature value of the overload protector, the bimetallic strip 6 jumps and moves rapidly, make two contacts break, cut off the circuit, and because disconnecting two ends of contact and connecting the resistance alloy 4 to generate heat at the same time, produce sufficient heat to make bimetallic strip 6 continue to keep jumping and taking off the state, only after cutting off the power, the contact can be closed, the miniaturized design, have the dual protective performance of sensing temperature and electric current and moving, especially connect the heating element 9 in series, it is more sensitive to the increase of the electric current, will not cause the electrical apparatus to overheat because of frequent disconnection of automatic reset, will not bring inconvenience because of manual reset either.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An overload protector capable of automatically resetting after power failure is characterized by comprising a shell (11), an insulating base (1), a bimetallic strip assembly support (7), a first connecting rivet (8), a second connecting rivet (10), a first connecting terminal (3) and a second connecting terminal (12), wherein the insulating base (1) is installed on the shell (11), resistance alloy (4) is sintered on the insulating base (1), through holes are formed in two ends of the insulating base (1), the bimetallic strip assembly support (7) penetrates into a middle hole of the insulating base (1) and is riveted and fixed, the bimetallic strip assembly support (7) is connected with one end of the resistance alloy (4), a static contact (2) is arranged in the through hole in one end of the insulating base (1), and the first connecting terminal (3) is sleeved on the static contact (2) and is fixed through riveting, the other end of stationary contact (2) and resistance alloy (4) is connected, penetrate second connection rivet (10) in the other end hole of insulating base (1), second binding post (12) are sheathe in through riveting fixed in second connection rivet (10), first connection rivet (8) are impressed in the centre bore of bimetallic strip subassembly support (7), the welding has bimetallic strip (6) and heating element (9) on first connection rivet (8), the other end welding movable contact (5) of bimetallic strip (6), the other end and the second of heating element (9) are connected rivet (10) welding.

2. An overload protector according to claim 1, characterised in that the first connection terminal (3) and the second connection terminal (12) are provided with wire guides (13).

3. The overload protector capable of automatically resetting after power failure as claimed in claim 2, wherein the insulating base (1) is made of ceramic, and the housing (11) is made of plastic.

4. A power-off automatic reset overload protector according to claim 3, wherein the first connecting rivet (8), the second connecting rivet (10) and the bimetallic strip (6) are made of copper.

5. The overload protector capable of automatically resetting after power failure as claimed in claim 4, wherein the surfaces of the fixed contact (2) and the movable contact (5) are provided with gold coatings.

6. The overload protector capable of automatically resetting after power failure according to claim 5, wherein the first wiring terminal (3) and the second wiring terminal (12) are provided with limiting covers (15), fastening pads are arranged in the limiting covers (15), limiting plates (14) are arranged on two sides of the wire groove (13), and the limiting covers (15) are connected with the limiting plates (14) through fixing bolts (16).

7. The overload protector capable of automatically resetting after power failure as claimed in claim 5, wherein the two ends of the insulating base (1) are provided with fixing holes, and the housing (11) is connected with the fixing holes through mounting bolts.