WO2018209777A1 - 一种机械式高灵敏度温度感应开关 - Google Patents

一种机械式高灵敏度温度感应开关 Download PDF

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Publication number
WO2018209777A1
WO2018209777A1 PCT/CN2017/091769 CN2017091769W WO2018209777A1 WO 2018209777 A1 WO2018209777 A1 WO 2018209777A1 CN 2017091769 W CN2017091769 W CN 2017091769W WO 2018209777 A1 WO2018209777 A1 WO 2018209777A1
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WIPO (PCT)
Prior art keywords
insulating
bimetal
metal
sensing switch
upper casing
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PCT/CN2017/091769
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English (en)
French (fr)
Inventor
郑劝文
苏冠贤
周善智
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东莞佐佑电子科技有限公司
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Publication of WO2018209777A1 publication Critical patent/WO2018209777A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/04—Bases; Housings; Mountings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/34—Means for transmitting heat thereto, e.g. capsule remote from contact member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/64—Contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/64—Contacts
    • H01H37/70—Resetting means

Definitions

  • the invention belongs to the technical field of temperature control, relates to a temperature sensing switch and an induction method, in particular to a mechanical high sensitivity temperature sensing switch and an induction method.
  • Temperature sensing switch also known as temperature control switch, also known as temperature controller or temperature controller
  • temperature control switch is a kind of intelligent or non-intelligent switch for temperature control. It can be used in various household appliances, electromechanical equipment and other temperature control occasions, and can be used according to users.
  • the set value is temperature-adjusted to achieve a suitable temperature.
  • the temperature-sensing switch can not only regulate the temperature, but also save energy, in line with the concept of green appliances advocated by modern society.
  • the temperature sensing switch specifically refers to an automatic control component that undergoes physical deformation in the switch according to the temperature change of the working environment, thereby generating certain special effects, causing conduction or disconnection action, and can be generally classified into mechanical and electronic according to the control method.
  • the mechanical temperature sensing switch comprises a steam pressure type temperature control switch, a liquid expansion type temperature control switch, a gas adsorption type temperature control switch and a metal expansion type temperature control switch
  • the electronic temperature sensing switch comprises a resistance type temperature control switch and a thermocouple.
  • Temperature control switch is based on the principle of thermal expansion and contraction of objects, and different degrees of thermal expansion and contraction of different objects are used. Bimetal pieces of different materials are used, and the bimetal pieces are changed at different temperatures due to different degrees of expansion and contraction. Bending, touching a contact or switch causes the set circuit to start working.
  • a temperature sensitive switch disclosed in the Chinese patent document CN103383903A includes an inner casing, a casing, a terminal, and a bimetal.
  • the sheet, the push rod and the metal elastic piece are disposed inside the outer casing and have a height smaller than the height of the outer casing.
  • the bimetal is disposed in the inner casing, and the surface thereof is difficult to contact with the electric heating device, so that the sensitivity of the induction switch is insufficient.
  • connection portion of the power input terminal is laminated on the end of the metal dome, and the overlapping portion is fixed to the upper end of the inner casing by the rivet, which requires a rivet hole on the inner casing, which increases the difficulty of assembly and also increases the difficulty of assembly. It is easy to infiltrate the conductor such as water inward from the rivet hole, so that the switch insulation performance is poor.
  • the heating rate can reach several tens of degrees per second.
  • the traditional temperature sensing switch has a slow response to temperature due to insufficient sensitivity, and cannot cut off the circuit to prevent electric heating in time. The component continues to heat up, creating a safety hazard.
  • the technical problem to be solved by the present invention is that the sensitivity of the conventional temperature sensing switch is not good, the conductor is easy to be close to the heating element, the insulation is poor, the safety hazard is easy to exist, the structure is complicated, and it is difficult to assemble, thereby providing a high sensitivity, high insulation, Mechanical, high-sensitivity temperature-sensing switch that is safe, simple in structure, and easy to mold.
  • the technical solution of the present invention is:
  • the invention provides a mechanical high sensitivity temperature sensing switch, which comprises:
  • An auxiliary heat sensing sheet disposed on an outer surface of the insulating upper casing
  • a bimetal disposed on an inner surface side of the insulating upper casing, in contact with the auxiliary thermal sensing sheet, wherein the auxiliary thermal sensing sheet has a hollow space for exposing the bimetal to directly contact the heating element;
  • An insulating push rod having one end disposed toward the bimetal and having a gap with the bimetal;
  • a metal rebound piece disposed at the other end of the insulating push rod and in contact with the insulating push rod;
  • a power input terminal is connected to one end of the metal rebound piece, and the other end of the metal rebound piece is provided with a movable metal contact;
  • a fixed metal contact is disposed corresponding to the movable metal contact, and is connectable or disconnectable with the movable metal contact, and the fixed metal contact is connected with a power output terminal.
  • the accommodating cavity is further provided with an insulating bracket
  • the fixed metal contact is connected to the insulating bracket to connect the power output terminal to the insulating bracket
  • the power input terminal is connected to the An insulating bracket, which in turn connects the metal rebound piece to the insulating bracket.
  • the insulating push rod is disposed perpendicular to the plane of the bimetal and the metal rebound, and the insulating push rod is disposed at the middle of the bimetal and the metal rebound.
  • the inner surface of the insulating upper casing is provided with a receiving groove for placing a bimetal.
  • the power input terminal and the power output terminal are both disposed at one end in the accommodating cavity, and the other end is extended outside the accommodating cavity.
  • the bimetal is circular, and correspondingly, the hollow is a circular through hole.
  • the auxiliary heat sensitive sheet is made of a metal material having a high thermal conductivity.
  • the auxiliary heat sensitive sheet is pressed or glued to the surface of the insulating upper casing.
  • the metal rebound piece is a charged body, and the metal rebound piece and the double metal piece are connected by an insulating push rod to electrically isolate the double metal piece from the metal rebound piece.
  • the mechanical high-sensitivity temperature sensor switch according to the present invention includes an insulating upper case and an insulating lower case that are mutually engageable, and an accommodation is formed between the insulating upper case and the insulating lower case.
  • the cavity, the insulating upper casing and the insulating lower casing are respectively formed by injection molding or integral molding, and the surface has no screw holes or slits, which can effectively prevent the electric conductor from entering the accommodating cavity to reduce the insulation of the induction switch, thereby affecting the temperature sensing switch.
  • the surface of the insulating upper casing is provided with an auxiliary heat sensing sheet, which is directly in contact with the electric heating element, which improves the sensitivity of the temperature sensing switch to sense temperature change, and at the same time, it is isolated from the charging element and has an uncharged effect;
  • the metal piece and the bimetal are located inside the accommodating cavity, and are attached to the auxiliary heat sensing sheet, and the auxiliary electric heating element has a through hole for exposing the bimetal, so that the bimetal can also directly contact the electric heating element, and also includes the insulation push.
  • the rod has a metal rebound piece connected to the other end of the bimetal, and the push rod is made of an insulating material, further improving the insulation of the temperature sensing switch.
  • the metal rebound piece is connected with a power input terminal and a movable metal contact, and a fixed metal contact is disposed at a position opposite to the movable metal contact.
  • the induction switch has a simple structure and is easy to assemble, and is suitable for mass production industrial production, and the auxiliary insulation sheet is tight. It is attached to the surface of the insulating upper casing, has a smooth surface, large contact area with electric heating elements, high sensitivity, fast response to temperature and high safety performance. It is suitable for electric heating elements with high voltage, current and power and high power density.
  • auxiliary heat-sensitive sheet is made of a metal material having a high thermal conductivity
  • auxiliary heat-sensitive sheet is made of a high thermal conductivity material such as a metal material having a high thermal conductivity. It can quickly conduct heat to the bimetal that is in contact with it, which helps the bimetal to sense temperature changes more sensitively.
  • FIG. 1 is a schematic structural view of a mechanical high-sensitivity temperature sensing switch according to an embodiment of the present invention
  • the reference numerals in the figure are: 1-insulating upper casing; 2-insulating lower casing; 3-auxiliary heat-sensitive sheet; 4-double metal sheet; 5-insulating push rod; 6-metal rebound sheet; 7-power supply Input terminal; 8 - movable metal contact; 9 - fixed metal contact; 10 - power output terminal; 11 - insulated bracket.
  • the embodiment provides a mechanical high-sensitivity temperature sensing switch, which can be used for a plurality of electric heating devices.
  • the electric heating device can be a conventional heating disk, as shown in FIG. 1-2, the temperature sensing switch include:
  • the auxiliary heat-sensitive sheet 3 is made of a metal material having a high thermal conductivity and a high thermal conductivity, which is bonded to the outer top surface of the insulating upper casing 1 by high temperature and high pressure bonding or by an adhesive. , to play the role of auxiliary heat conduction, the surface of the auxiliary heat-sensitive sheet 3 is flat, flat on the surface of the insulating upper casing 1 or slightly protruded from the surface of the insulating upper casing 1, and the protruding height does not exceed 0.1 mm;
  • the bimetal 4 is composed of a copper sheet disposed adjacent to the auxiliary heat sensitive sheet 3 and an iron sheet away from the side of the auxiliary heat sensing sheet 3. When heated, the copper sheet expands and deforms to a large extent, and the bimetal sheet is oriented.
  • the iron piece is bent side, the copper piece in the bimetal 4 is in contact with the auxiliary heat sensitive sheet 3, and the auxiliary heat sensitive sheet 3 has a hollow space which can expose the bimetal 4 and directly contact the heating element, this embodiment
  • the cross-sectional pattern of the bimetal 4 is circular, and correspondingly, the cutout is a circular through hole, and in order to better contact the bimetal 4 with the auxiliary thermal sensor 3 and the heating element,
  • the inner surface of the upper casing 1 is provided with a receiving groove, and the bimetal 4 is disposed in the receiving groove;
  • Insulating the push rod 5 one end of the insulating push rod 5 is disposed toward the plane of the bimetal 4, and a gap between the insulating push rod 5 and the bimetal 4 is provided for bending deformation of the bimetal 4. ;
  • a metal rebound piece 6 which is disposed at the other end of the insulating push rod 5 in the axial direction, and is in contact with the end of the insulating push rod 5, in order to better promote the push rod 5 perpendicular to the bimetal 4 and
  • the metal rebound piece 6 is disposed in a plane, and the insulating push rod 5 is disposed at a central position of the bimetal 4 and the metal rebound piece 6, wherein the metal rebound piece 6 is a charged body, and the bimetal piece 4 is non-charged.
  • the metal rebound piece 6 and the bimetal 4 are connected by the insulating push rod 5, so that the bimetal 4 and the metal rebound piece 6 are electrically isolated;
  • the power input terminal 7 is connected to one end of the metal rebound piece 6 in the longitudinal direction, and the other end of the metal rebound piece 6 is provided with the movable metal contact 8;
  • a fixed metal contact 9 which is disposed corresponding to the movable metal contact 8 , can be connected or disconnected from the movable metal contact 8 to open or close the temperature sensing switch, and the fixed metal contact 9 is connected with the power output terminal 10,
  • the power input terminal 7 and the power output terminal 10 are both disposed at one end of the accommodating cavity, and the other end is extended outside the accommodating cavity to be connected to an external component.
  • the temperature sensing switch further includes an insulating bracket 11 , the insulating bracket 11 is disposed in the accommodating cavity, and the fixed metal contact 9 is fixedly connected to the insulating bracket 11 to further the power output terminal 10 and the insulating bracket
  • the power input terminal 7 is fixedly connected to the insulating bracket 11, and the metal rebound piece 6 is also connected to the insulating bracket 11.
  • the insulating bracket 11 functions to insulate the charging element from the non-charging element.
  • the bimetal 4 and the auxiliary thermal sensor 3 are simultaneously in direct contact with the electric heating element.
  • the bimetal 4 senses the high temperature and is rapidly deformed, and bends to one end of the insulating push rod 5. Pushing the insulating push rod 5 to move toward the metal rebound piece 6, and the metal rebound piece 6 moves away from the bimetal 4 to drive the movable metal contact 8 connected thereto to move away from the bimetal 4, so that the movable metal
  • the contact member 8 is separated from the fixed metal contact member 9, thereby cutting off the circuit and effecting to stop the heating element from continuing to generate heat.
  • the heating element is normally hot.

Abstract

本发明公开了一种机械式高灵敏度温度感应开关，其包括，绝缘上壳体、绝缘下壳体，绝缘上壳体和绝缘下壳体分别采用注塑或一体成型的方式制得，表面无螺孔或缝隙，可有效防止导电体进入容置腔，提高了温度感应开关的灵敏度，绝缘上壳体表面设置有辅助热感应片，其直接与电热元件接触，改善了温度感应开关感应温度变化的灵敏度，同时，其与带电元件隔离；还包括双金属片，其贴合辅助热感应片同时也可直接与电热元件接触，还包括绝缘推动杆，进一步提升了温度感应开关的绝缘性能，该感应开关结构简单、易于组装，适合批量化工业生产，辅助绝缘片紧贴于绝缘上壳体表面，表面平整，与电热元件接触面积大，灵敏度高，对温度反应速度快，安全性能高。

Description

一种机械式高灵敏度温度感应开关
技术领域
本发明属于温控技术领域，涉及一种温度感应开关及感应方法，具体地说涉及一种机械式高灵敏度温度感应开关及感应方法。
背景技术
温度感应开关又称温控开关，也称为温控器或温度控制器，是一种控制温度的智能或非智能开关，可用于各类家用电器、机电设备等温度控制场合，并能按照用户设定的数值进行温度调节以达到适合的温度，对于家用电器来讲，温度感应开关除了可以起到调节温度的功能，同时还具有节省能源的作用，符合现代社会所提倡的绿色家电的理念。
温度感应开关具体是指根据工作环境的温度变化在开关内发生物理形变，从而产生某些特殊效应，发生导通或断开动作的自动控制元件，按照控制方法一般可分为机械式和电子式，其中机械式温度感应开关包括蒸汽压力式温控开关、液体膨胀式温控开关、气体吸附式温控开关和金属膨胀式温控开关，电子式温度感应开关包括电阻式温控开关和热电偶式温控开关。其中金属膨胀式温控开关是根据物体热胀冷缩原理，利用不同物体热胀冷缩程度不同，采用不同物质的双金属片，在变化的温度下由于涨缩程度不一样而使双金属片弯曲，碰触到触点或开关使设定的电路开始工作。
目前市面上传统机械式温度感应开关存在感应开关感应灵敏性不足、结构复杂、难以组装等问题，如中国专利文献CN103383903A公开的一种温敏开关，其包括内壳、外壳、接线端子、双金属片、推杆以及金属弹片，内壳设置于外壳内部，且高度小于外壳的高度，双金属片设置于内壳内，其表面难以与电热器件接触，使得感应开关灵敏性不足。另外，电源输入端接线端子的连接部叠压于金属弹片端部至上，其重叠部分通过铆钉固定于内壳的上端，这需要在内壳上开设铆钉孔，加大了组装难度的同时，还容易从铆钉孔向内渗入水等导体，使得开关绝缘性能差。对于电压高、电流和功率大以及功率密度高的发热体，升温速率可达每秒几十度以上，传统的温度感应开关由于灵敏性不足对温度反应比较迟缓，无法及时有效地切断电路阻止电热元件继续加热，导致产生安全隐患。
发明内容
为此，本发明所要解决的技术问题在于传统温度感应开关灵敏度不佳，导体易接近发热体、绝缘性差，易存在安全隐患，结构复杂、难以组装，从而提出一种高灵敏度、高绝缘性、安全、结构简单、易于成型制作的机械式高灵敏度温度感应开关。
为解决上述技术问题，本发明的技术方案为：
本发明提供一种机械式高灵敏度温度感应开关，其包括：
可相互扣合的绝缘上壳体、绝缘下壳体，所述绝缘上壳体与绝缘下壳体之间形成容置腔；
辅助热感应片，设置于所述绝缘上壳体外表面；
双金属片，设置于所述绝缘上壳体内表面侧，其与所述辅助热感应片相接触，所述辅助热感应片具有可使双金属片外露、直接与加热元件接触的镂空位；
绝缘推动杆，其一端朝向所述双金属片设置并与双金属片之间具有空隙；
金属回弹片，设置于所述绝缘推动杆另一端，且与所述绝缘推动杆接触；
电源输入端子，连接于所述金属回弹片的一端，所述金属回弹片另一端设置有活动金属接触件；
固定金属接触件，与所述活动金属接触件相对应设置，可与所述活动金属接触件连接或断开，所述固定金属接触件连接有电源输出端子。
作为优选，所述容置腔内还设置有绝缘支架，所述固定金属接触件连接于所述绝缘支架进而使所述电源输出端子连接于所述绝缘支架，所述电源输入端子连接于所述绝缘支架，进而使所述金属回弹片连接于所述绝缘支架。
作为优选，所述绝缘推动杆垂直于所述双金属片和金属回弹片平面设置，且所述绝缘推动杆设置于所述双金属片、金属回弹片中部。
作为优选，所述绝缘上壳体内表面开设有用于放置双金属片的容置槽。
作为优选，所述电源输入端子、电源输出端子均一端设置于容置腔内，另一端伸出所述容置腔外部。
作为优选，所述双金属片为圆形，相应地，所述镂空位为圆形通孔。
作为优选，所述辅助热感应片的材质为高导热系数的金属材料。
作为优选，所述辅助热感应片压合或胶粘于所述绝缘上壳体表面。
作为优选，所述金属回弹片为带电体，所述金属回弹片与所述双金属片通过绝缘推动杆连接，使所述双金属片与所述金属回弹片实现电隔离。
本发明的上述技术方案相比现有技术具有以下优点：
（1）本发明所述的机械式高灵敏度温度感应开关，其包括，可相互扣合的绝缘上壳体、绝缘下壳体，所述绝缘上壳体与绝缘下壳体之间形成容置腔，绝缘上壳体和绝缘下壳体分别采用注塑或一体成型的方式制得，表面无螺孔或缝隙，可有效防止导电体进入容置腔降低感应开关的绝缘性，从而影响温度感应开关的灵敏度，绝缘上壳体表面设置有辅助热感应片，其直接与电热元件接触，改善了温度感应开关感应温度变化的灵敏度，同时，其与带电元件隔离，具有不带电的效果；还包括双金属片，双金属片位于容置腔内部，贴合辅助热感应片设置，且辅助电热元件具有使双金属片外露的通孔，使得双金属片也可以直接与电热元件接触，还包括绝缘推动杆，其一端朝向双金属片另一端连接金属回弹片，推动杆为绝缘材质，进一步提升了温度感应开关的绝缘性能，金属回弹片连接有电源输入端子和活动金属接触件，与活动金属接触件相对的位置设置有固定金属接触件，该感应开关结构简单、易于组装，适合批量化工业生产，辅助绝缘片紧贴于绝缘上壳体表面，表面平整，与电热元件接触面积大，灵敏度高，对温度反应速度快，安全性能高，适用于电压、电流和功率大、功率密度高的电热元件。
（2）本发明所述的机械式高灵敏度温度感应开关，容置腔内还设置有绝缘支架，所述固定金属接触件连接于所述绝缘支架进而使所述电源输出端子连接于所述绝缘支架，所述电源输入端子连接于所述绝缘支架，进而使所述金属回弹片连接于所述绝缘支架。将电源输入端子、电源输出端子、固定金属接触件均连接于所述绝缘支架，实现了带电元件与非带电元件绝缘隔离的效果。
（3）本发明所述的机械式高灵敏度温度感应开关，所述辅助热感应片的材质为高导热系数的金属材料，所述辅助热感应片采用高导热系数的金属材料等高导热材质，其可将热量快速传导与其接触的至双金属片上，有利于双金属片更灵敏地感知温度变化。
附图说明
为了使本发明的内容更容易被清楚的理解，下面根据本发明的具体实施例并结合附图，对本发明作进一步详细的说明，其中
图1是本发明实施例所述的机械式高灵敏度温度感应开关的结构示意图；
[根据细则26改正07.09.2017]　
图中附图标记表示为：1-绝缘上壳体；2-绝缘下壳体；3-辅助热感应片；4-双金属片；5-绝缘推动杆；6-金属回弹片；7-电源输入端子；8-活动金属接触件；9-固定金属接触件；10-电源输出端子；11-绝缘支架。
具体实施方式
实施例
本实施例提供一种机械式高灵敏度温度感应开关，其可用于多种电热器件，本实施例中，所述电热器件可以为常规发热盘，如图1-2所示，所述温度感应开关包括：
可相互扣合的绝缘上壳体1、绝缘下壳体2，所述绝缘上壳体1与所述绝缘下壳体2均由常规绝缘材料制得，二者之间形成容纳其它元件的容置腔；
辅助热感应片3，所述辅助热感应片3的材质为高导热系数的高导热系数的金属材料，其通过高温高压压合或用胶黏剂粘合于绝缘上壳体1的外顶面，起到辅助传导热量的作用，辅助热感应片3表面为平面，平贴于绝缘上壳体1表面或略凸出于绝缘上壳体1表面，凸出高度不超过0.1mm；
双金属片4，所述双金属片由紧贴辅助热感应片3设置的铜片和远离辅助热感应片3一侧的铁片组成，受热时，铜片膨胀变形程度大，双金属片向铁片侧弯曲，所述双金属片4中的铜片与辅助热感应片3接触，并且辅助热感应片3具有可使双金属片4外露、直接与加热元件接触的镂空位，本实施例中，所述双金属片4的截面图形为圆形，相应地，所述镂空位为圆形通孔，为了使双金属片4更好地与辅助热感应片3以及加热元件接触，所述绝缘上壳体1内顶面开设有容置槽，所述双金属片4设置于该容置槽中；
绝缘推动杆5，所述绝缘推动杆5轴向的一端朝向所述双金属片4的平面设置，并且绝缘推动杆5与双金属片4之间留有可供双金属片4弯曲变形的间隙；
金属回弹片6，其设置于绝缘推动杆5轴向的另一端，并且与绝缘推动杆5的端部相接触，为了更好地起到推动作用，绝缘推动杆5垂直于双金属片4和金属回弹片6的平面设置，并且绝缘推动杆5设置于所述双金属片4、金属回弹片6的中央位置，其中，所述金属回弹片6为带电体，而双金属片4为非带电体，金属回弹片6与双金属片4通过绝缘推动杆5连接，使得双金属片4与金属回弹片6实现了电隔离；
电源输入端子7，连接于金属回弹片6长度方向上的一端，金属回弹片6的另一端设置有活动金属接触件8,；
固定金属接触件9，其与活动金属接触件8对应设置，可与活动金属接触件8连接或断开实现温度感应开关的开或关，固定金属接触件9连接有电源输出端子10，所述电源输入端子7、电源输出端子10均一端设置于所述容置腔内，另一端伸出所述容置腔外部，与外界部件连接。
进一步地，所述温度感应开关还包括绝缘支架11，所述绝缘支架11设置于所述容置腔内，所述固定金属接触件9固定连接于绝缘支架11进而使电源输出端子10与绝缘支架连接，所述电源输入端子7固定连接于所述绝缘支架11，进而使金属回弹片6也与绝缘支架11连接，绝缘支架11起到将带电元件与非带电元件绝缘隔离的作用。
本实施例所述的机械式高灵敏度温度感应开关的工作过程为：
双金属片4和辅助热感应片3同时与电热元件直接接触，当电热元件快速升温并达到预设的额定温度时，双金属片4对高温进行感应急速变形，向绝缘推动杆5的一端弯曲，推动绝缘推动杆5向金属回弹片6方向运动，金属回弹片6向远离双金属片4的方向运动进而带动与其连接的活动金属接触件8向远离双金属片4的方向运动，使得活动金属接触件8与固定金属接触件9分离，从而切断电路，实现停止电热元件继续发热的作用。
在正常工作状态、温度微达到预设值的情况下，双金属片4未产生形变，绝缘推动杆5未进行运动，活动金属接触件8、固定金属接触件9相互接触，电路正常导通，电热元件正常发热。
显然，上述实施例仅仅是为清楚地说明所作的举例，而并非对实施方式的限定。对于所属领域的普通技术人员来说，在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。而由此所引伸出的显而易见的变化或变动仍处于本发明创造的保护范围之中。

Claims (9)

  1. 一种机械式高灵敏度温度感应开关，其特征在于，其包括：
    可相互扣合的绝缘上壳体、绝缘下壳体，所述绝缘上壳体与绝缘下壳体之间形成容置腔；
    辅助热感应片，设置于所述绝缘上壳体外表面；
    双金属片，设置于所述绝缘上壳体内表面侧，其与所述辅助热感应片相接触，所述辅助热感应片具有可使双金属片外露、直接与加热元件接触的镂空位；
    绝缘推动杆，其一端朝向所述双金属片设置并与双金属片之间具有空隙；
    金属回弹片，设置于所述绝缘推动杆另一端，且与所述绝缘推动杆接触；
    电源输入端子，连接于所述金属回弹片的一端，所述金属回弹片另一端设置有活动金属接触件；
    固定金属接触件，与所述活动金属接触件相对应设置，可与所述活动金属接触件连接或断开，所述固定金属接触件连接有电源输出端子。
  2. 根据权利要求1所述的机械式高灵敏度温度感应开关，其特征在于，所述容置腔内还设置有绝缘支架，所述固定金属接触件连接于所述绝缘支架进而使所述电源输出端子连接于所述绝缘支架，所述电源输入端子连接于所述绝缘支架，进而使所述金属回弹片连接于所述绝缘支架。
  3. 根据权利要求2所述的机械式高灵敏度温度感应开关，其特征在于，所述绝缘推动杆垂直于所述双金属片和金属回弹片平面设置，且所述绝缘推动杆设置于所述双金属片、金属回弹片中部。
  4. 根据权利要求3所述的机械式高灵敏度温度感应开关，其特征在于，所述绝缘上壳体内表面开设有用于放置双金属片的容置槽。
  5. 根据权利要求4所述的机械式高灵敏度温度感应开关，其特征在于，所述电源输入端子、电源输出端子均一端设置于容置腔内，另一端伸出所述容置腔外部。
  6. 根据权利要求5所述的机械式高灵敏度温度感应开关，其特征在于，所述双金属片为圆形，相应地，所述镂空位为圆形通孔。
  7. 根据权利要求6所述的机械式高灵敏度温度感应开关，其特征在于，所述辅助热感应片的材质为高导热系数的金属材料。
  8. 根据权利要求7所述的机械式高灵敏度温度感应开关，其特征在于，所述辅助热感应片压合或胶粘于所述绝缘上壳体表面。
  9. 根据权利要求8所述的机械式高灵敏度温度感应开关，其特征在于，所述金属回弹片为带电体，所述金属回弹片与所述双金属片通过绝缘推动杆连接，使所述双金属片与所述金属回弹片实现电隔离。
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