CN201435359Y

CN201435359Y - Overload protector

Info

Publication number: CN201435359Y
Application number: CN2009201205963U
Authority: CN
Inventors: 杨家明
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-05-22
Filing date: 2009-05-22
Publication date: 2010-03-31
Anticipated expiration: 2019-05-22

Abstract

The utility model provides an overload protector which comprises a shell body and an outer cover. The outer cover is buckled with the shell body, a keystroke is movably inserted on the shell body in apenetrating manner, a bracket terminal and a contact terminal are embedded at the bottom part of the shell body, a bimetal jumping plate is arranged on the bracket terminal in a riveting manner, a dynamic contact is arranged at the movable end of the bimetal jumping plate in a riveting manner, a static contact which is opposite to the dynamic contact is arranged on the contact terminal in a riveting manner, the movable end of the bimetal jumping plate is connected with the keystroke by a hook, and the movable end of the bimetal jumping plate is supported in a V-shaped groove on the inner wallof the shell body after connecting an N-shaped arced reed. A position-limiting bracket which is embedded in the shell body is arranged below the keystroke, and a compression spring is arranged between the position-limiting bracket and the keystroke. When in current overload, the bimetal jumping plate can be heated and deformed, so as to separate the dynamic contact from the static contact, switchout a circuit and avoid an electrical appliance from being burned down. The overload protector has the advantages of simple operation, small volume, low cost, long service life and good market prospect.

Description

Overload protective device

Technical field:

The utility model relates to a kind of disconnect of overload protection, a kind of specifically overload protective device that utilizes bimetal leaf temperature distortion principle.

Background technology:

Because the power of electrical equipment high-power electric appliance excessive, that use is too much or short circuit all can produce the current overload phenomenon, former frequent installation insurance silk is avoided electrical equipment being burnt out or other accidents taking place because of current overload, and fuse can break immediately and cuts off circuit when current overload.But fuse can't recover after circuit fusing voluntarily, also has the danger of electric shock during replacing.People's overload protective device that begun to utilize bimetal leaf temperature distortion principle design for this reason; disclosed on February 14th, 2007 as Patent Office of the People's Republic of China; Granted publication number is " the modified model thermal overload protection device " of " CN2870141Y "; it comprises pedestal and Ji Gai; two gold plaques; fixed contact and moving contact; both sides groove internal fixation is directly held and bent-up end in the pedestal; be fixed with dynamic static joint on the straight end; place the release lever that has spring in the medial launder; the moving bar of release lever upper end cover; one swivel nut cover precession bar and part release lever are stuck on the pedestal, and two gold plaque one ends are fixed on the bent-up end; fixing moving contact under the other end.When current overload, moving contact meeting and fixed contact on two gold plaques separate, and release lever moves up under the effect of spring restoring force simultaneously, embeds between moving contact and the fixed contact, and both are separated.Two gold plaques of this product need stretched, thereby its physical property is changed, and simultaneously because the temperature of moving contact and fixed contact is very high, the back release lever of repeatedly working can melt, and therefore certain potential safety hazard is arranged.

The utility model content:

The purpose of this utility model is at the defective of above-mentioned prior art and deficiency, for people provide the overload protective device that a kind of volume is little, cost is low, safe.

Technical solution adopted in the utility model is for achieving the above object: this overload protective device comprises housing and the outer cover that is interlocked with housing; activity is interspersed with button on the described housing; be embedded with support terminal and contact terminal at housing bottom; the bimetallic springboard is equipped with in riveting on the support terminal; moving contact is equipped with in the movable end riveting of this bimetallic springboard; the fixed contact relative with moving contact is equipped with in riveting on the described contact terminal; described bimetallic springboard movable end links to each other with button by hook, and this bimetallic springboard movable end is by connection " N " shape bend to be supported in behind the spring be opened in inner walls " V " in the shape groove.

Described button below is provided with the limiting bracket in the setting-in housing, is provided with the compression spring between this limiting bracket and button.

Described housing sidewall is provided with voussoir, and described outer cover is provided with the square hole that is complementary with voussoir.

The utility model is when current overload, and bimetallic springboard meeting temperature distortion separates moving contact and fixed contact, open circuit avoids electrical equipment to burn out, under the restoring force effect that the bow spring makes progress, moving contact on the bimetallic springboard can't be close with the fixed contact on the contact terminal, safe.The bimetallic springboard is resetted, moving contact and fixed contact are offseted, circuit is connected, and recovers the protection to electrical equipment.Because the downward restoring force effect of bow spring makes moving contact and fixed contact contact stabilization.Have advantage simple to operate, that volume is little, cost is low, the life-span is long, good market prospects are arranged.

Description of drawings:

Fig. 1 is the utility model STRUCTURE DECOMPOSITION schematic diagram.

Schematic diagram when Fig. 2 connects for the utility model circuit.

Schematic diagram when Fig. 3 disconnects for the utility model circuit.

Embodiment:

As shown in Figure 1, shown in Figure 2; the utility model overload protective device; it comprises housing 2, outer cover 13 and the movable button 1 that is interspersed on the housing 2; described housing 2 sidewalls are provided with voussoir 2.2; outer cover 13 is provided with the square hole 13.1 that is complementary with voussoir 2.2, and the cooperation by voussoir 2.2 and square hole 13.1 can make housing 2 and outer cover 13 closely interlock.Described button 1 below is provided with the limiting bracket 12 in the setting-in housing 2, is used for the below of button 1 spacingly, is provided with between this limiting bracket 12 and button 1 and compresses spring 3.In the slotted eye of housing 2 bottoms, be embedded with support terminal 11 and contact terminal 9, above support terminal 11, be provided with bimetallic springboard 7, one end of this bimetallic springboard 7 is by copper rivet 4 and support terminal 11 riveted and fixed, moving contact 10 is equipped with in riveting on its movable end, and the fixed contact 8 relative with this moving contact 10 is equipped with in riveting on contact terminal 9.Described button 1 bottom sidewall is provided with radial protrusion 1.1, and the upper end of hook 6 is fastened on this radial protrusion 1.1, the lower end and the bimetallic springboard 7 movable end tablings of hook 6.The make progress bending and offer relative through hole 7.1 of the movable end both sides of described bimetallic springboard 7, " N " arm of shape bow spring 5 is flush-mounted in and is arranged on housing 2 inwalls " V " shape groove 2.1 bottoms, another arm is interspersed in the through hole 7.1 of bimetallic springboard 7.

As Fig. 2, shown in Figure 3, pressing keys 1, the movable end that promotes bimetallic springboard 7 moves down, and the fixed contact 8 on moving contact 10 and the contact terminal 9 is offseted, and makes circuit turn-on.This moment is because the downward restoring force effect of bow spring 5 makes moving contact 10 and fixed contact 8 contact stabilizations.When current overload, bimetallic springboard 7 expanded by heating distortion, and its deformation force is greater than the restoring force of bow spring 5, and the movable end of bimetallic springboard 7 will upwards bounce, and moving contact 10 and fixed contact 8 is disconnected, thereby can avoid electrical equipment to burn out because of current overload.When move on the movable end of bimetallic springboard 7 and with bow spring 5 when being in same straight line, bow spring 5 is compressed to beeline, and this cantle spring 5 can produce restoring force upwards, and the while is down auxiliary compression spring 3, help upwards spring of bimetallic springboard 7, and promotion button 1 pops up.Under the restoring force effect that bow spring 5 makes progress, the moving contact 10 on the bimetallic springboard 7 can't contact with the fixed contact 8 on the contact terminal 9, and is safe.

Claims

1; a kind of overload protective device; it comprises housing (2) and the outer cover (13) that is interlocked with housing (2); described housing (2) is gone up activity and is interspersed with button (1); be embedded with support terminal (11) and contact terminal (9) in housing (2) bottom; go up riveting at support terminal (11) bimetallic springboard (7) is housed; moving contact (10) is equipped with in the movable end riveting of this bimetallic springboard (7); described contact terminal (9) is gone up riveting the fixed contact (8) relative with moving contact (10) is housed; it is characterized in that described bimetallic springboard (7) movable end links to each other with button (1) by hook (6), and this bimetallic springboard (7) movable end bend to be supported in behind the spring (5) by connection " N " shape be opened in housing (2) inwall " V " in the shape groove (2.1).

2, overload protective device according to claim 1 is characterized in that described button (1) below is provided with the limiting bracket (12) in the setting-in housing (2), is provided with compression spring (3) between this limiting bracket (12) and button (1).

3, overload protective device according to claim 1 and 2 is characterized in that described housing (2) sidewall is provided with voussoir (2.2), and described outer cover (13) is provided with the square hole (13.1) that is complementary with voussoir (2.2).