CN2529374Y - Overtemperature protection thermoswitch - Google Patents

Abstract

The utility model relates to an overtemperature protection thermoswitch which is used for sensing the ambient temperature and realizing the electric loop switching control, and aims to solves the defects that the prior art device has the disadvantages of weak operational reliability and low inducting sensitivity; thereby the realizing mode of the utility model is that the overtemperature protection thermoswitch comprises a casing and an electrode, a moving contact which is arranged in the casing and utilizes the deformation of the heat acting bimetallic strip to control and thrust the centre of an electric spring sheet, and a fixed contact which is arranged at the cover plate of the casing corresponding to the moving contact and connected with another electrode, and the combined switch body is encased by the thermoplastic insulation material. Thereby the utility model has the advantages of quick switch response, high reliability and good sensitivity.

Description

Over-temperature Thermal Protection Switch

Technical field the utility model relates to the break-make control that the temperature distortion that produces by bimetal leaf is finished circuit, to reach the thermoswitch technology of protection electric equipment purpose.The common thermosensitive switch of background technology is for being the movable electrode of operation strip with the bimetal leaf; with the fixed electrode that constitutes the circuit that is in the contact point closed form usually with this movable electrode; thereby can be by this heat induction switch is connected in the electric equipment loop, to protect this electric equipment.Be called that " thermosensitive switch " disclosed technical scheme has just adopted an end to fix, the other end is movable electrode, be implemented in the heat induction switch that design temperature impels contact point closure, disconnection as Chinese patent application CN001215116, name with the housing fixed electrode, this heat induction switch is the long rectangle housing of the concrete bodily form, this profile is held susceptible to outside pressure, portion produces stress deformation within it, and changes the response temperature of its setting easily; And be the moving contact of switch with the bimetal leaf directly, cause its switching speed slow, easily generation is turn-offed arcing and is destroyed Switch main body, the fragile rate height; Particularly its bimetal leaf is arranged in the insulation box body, the heat-conductive characteristic of insulating material is very poor, had a strong impact on its heat sensitive ability, and the composition structure of its parts is comparatively complicated again, the actual thermoinduction effective area of bimetal leaf only is a little less than 1/3rd of its switch profile area is gone back, thereby further reduced the sensitivity of its thermal response, so the reliability and stability of above-mentioned prior art scheme are still imperfect.Summary of the invention is slow for the switch motion that the thermoswitch that solves prior art or heat induction switch mainly exist; the actual thermoinduction effective area of bimetal leaf is little; easily produce stress deformation; and cause the arcing phenomenon; damage switch contact and the thermoinduction sensitivity that influences switch; the execution temperature that departs from factory setting; the actual techniques problem that qualification rate is low; the technical scheme of Over-temperature Thermal Protection Switch provided by the utility model; installation housing that its major technique characteristics are its switches or surface that housing is installed for or be coated with electric conducting material and form the electric conductor that is connected with an electrode; rely on the distortion of heat action bimetal leaf to promote the moving contact at an electroconductive elastic sheet center in the housing; the housing cover that corresponds to moving contact is provided with the fixed contact that is connected in another electrode, and the switch body of being formed is sealed wrapped with insulation by thermoplastic.The ratio that the actual thermoinduction effective area of the thermoinduction bimetal leaf of the technology of the present invention accounts for this switch and environment contact area increases, and can reach more than 80%, thereby the thermoinduction time is short and sensitive; In addition, this construction of switch has been abandoned structure too loaded down with trivial details in the prior art and has been formed mode, given prominence to the structure centre of thermoinduction parts in whole switch body, obviously dwindled the overall volume of switch, thereby guaranteed both to make the external world to have bigger actuating pressure also can not influence the thermal response parameter of switch itself, so can improve the ex factory pass rate of product greatly, and its structure is suitable for producing in enormous quantities; Particularly present technique not directly with bimetal leaf as moving contact, but promote moving contact on another elastic component by its thermal deformation, eliminate the technology disadvantage that original switch motion that causes because of the action resilient contact that relies on bimetal leaf itself slowly, easily causes arcing, its switching speed is very quick, reach the switching speed of ms at last, overcome of the destruction of switch arc light greatly switch itself.

Description of drawings

Fig. 1, Fig. 2 are the sectional structure schematic diagram of same concrete enforcement structure of the present utility model, the structure chart of Fig. 1 switch static state wherein, and Fig. 2 is the dynamic structure chart of switch

Fig. 3 is the shape assumption diagram of this thermoswitch.

Below by providing a kind of enforceable frame mode to describe technology contents of the present utility model in detail.Embodiment as shown in the figure; the thermoswitch of this overtemperature prote includes installs housing 1; this housing 1 is barrel-shaped; and be electric conductor; perhaps its surface is coated with electric conducting material; one electrode link is fixedly welded on this housing; be provided with arc top moving contact shell fragment 2 upwards in the housing 1 and have the bimetal leaf 3 that same arc is provided with; the central hole at the center of shell fragment 2 and bimetal leaf 3 is provided with moving contact 4; and moving contact 4 drops on the shell fragment 2; the opening part of housing 1 is sealed by a cover plate 5, and the center of cover plate 5 is provided with the fixed contact 6 with respect to moving contact 4, and this fixed contact 6 is exposed to the cover plate outside and is the connection pad of another electrode 9.Described cover plate can be metallic plate, and the fixed contact of removing the center is wrapped with high-temperature insulation material film 7, also can be made by insulating material, and the fixed contact position at its center is an electric conducting material.This switch body is sealed sealed envelope by high-temperature insulation material pipe 10 with its thermoplastic.This switch is when static state, and shell fragment 2 pushes moving contact 4 and connects with fixed contact 6, realizes the closure state of switch; When this switch when the induced environment temperature reaches the execution high temperature of setting, its bimetal leaf 3 response distortion rapidly upwarps, its arc roof pressure spring plate 2 upwarps its distortion, pulling moving contact 4 fixed contact 6 that speeds away, cut-off switch body; When temperature falls after rise to required operating ambient temperature again, bimetal leaf 3 distortion upsets, this moment, shell fragment 2 was also with its static form of its elastic return.In this structure, the bottom of its housing 1 is provided with a concave surface 8, to impel bimetal leaf 3 and shell fragment 2 reliable distortion upsets.

Claims (4)

1, a kind of Over-temperature Thermal Protection Switch; the surface that it is characterized in that the installation housing of switch or housing is installed for or be coated with electric conducting material and form the electric conductor that is connected with an electrode; rely on the distortion of heat action bimetal leaf (3) to promote the moving contact (4) at an electroconductive elastic sheet (2) center in the housing (1); the housing cover (5) that corresponds to moving contact is provided with the fixed contact (6) that is connected in another electrode, and the switch body of being formed is sealed wrapped with insulation by thermoplastic.

2, thermoswitch according to claim 1 is characterized in that cover plate (5) is a metallic plate, and the fixed contact of removing the center is wrapped with high-temperature insulation material film (7).

3, thermoswitch according to claim 1 is characterized in that cover plate (5) made by insulating material, and the fixed contact at its center (6) position is an electric conducting material.

4, thermoswitch according to claim 1 is characterized in that the bottom of housing (1) is provided with a concave surface (8).

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