CN2741173Y

CN2741173Y - Heat sensitive switch

Info

Publication number: CN2741173Y
Application number: CN 200420094989
Authority: CN
Inventors: 潘启宏
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-11-04
Filing date: 2004-11-04
Publication date: 2005-11-16
Anticipated expiration: 2014-11-04

Abstract

The utility model discloses a heat sensitive switch relating to a switch for electrical apparatus. The heat sensitive switch comprises an insulating shell, an upper connecting block and a lower connecting block. The upper connecting block is a heat sensitive bimetal leaf, and the right lower part of the upper connecting block is provided with a moving contact. A breakback contact is provided with the upper part of one end of the lower connecting block, and two contacts are in a closed state in normal use. An insulating barrier, a spring and a reset push bar are arranged in the insulating shell. When the ambient temperature increases to the response temperature set by the heat sensitive bimetal leaf, the moving contact on the upper connecting block is separated to the breakback contact on the lower connecting block. At this time, the insulating barrier is moved and is pushed to the interval between two contacts by the reset push bar under the spring thrust function, and the two contacts are separated to disconnect the circuit. The circuit is reclosed through pressing the reset push bar, and the insulating barrier exits between the two contacts, avoiding the automatic reset of the heat sensitive switch when the ambient temperature decreases to protect the electrical apparatus.

Description

Thermoswitch

Technical field

The utility model relates to a kind of switch that is used for electric equipment, relates in particular to a kind of thermoswitch of realizing the break-make of circuit by the temperature distortion that thermosensitive bimetal produced.

Background technology

At present; the employed thermoswitch of people is for being the movable electrode of operation strip with the thermosensitive bimetal and constituting the fixed electrode of the circuit that is in the contact point closed form usually with this movable electrode; when being connected this thermoswitch in the electric equipment loop; if environment temperature will realize when surpassing the response temperature of setting that contact point disconnects, thereby reach the purpose of this electric equipment of protection.Because of aforesaid thermoswitch is directly to be that movable electrode is implemented in design temperature with fixed electrode and impels contact point closure, disconnection with the thermosensitive bimetal, if environment temperature raise when circuit broke down, thermoswitch disconnects circuit when environment temperature is raised to the response temperature of thermosensitive bimetal setting, at this moment environment temperature can descend, even when environment temperature be reduced to the response temperature of setting when following fault in the circuit do not eliminate thermoswitch and can closed again circuit be connected yet, thereby influence the safety of electric equipment.

The utility model content

In order to overcome the prior art above shortcomings; the utility model provides a kind of thermoswitch of protecting electric equipment more safely and reliably; its main feature is that insulating barrier is set in insulation shell; the spring and the push rod that resets; moving contact when environment temperature is raised to the response temperature of thermosensitive bimetal setting on the upper wiring board separates with the fixed contact on the following terminal block; at this moment the push rod that resets moves and makes it to push the gap between two contacts to and two contacts are separated driving insulating barrier under the spring thrust effect; must press the push rod that resets insulating barrier is withdrawed between two contacts if will reclose circuit, thereby avoid when environment temperature reduces thermoswitch to understand automatically reset deficiency.

The technical scheme that its technical problem that solves the utility model adopts is: a kind of thermoswitch comprises insulation shell, upper wiring board, following terminal block.The right lower quadrant of upper wiring board is provided with moving contact, and the upper wiring board left end is fixedly connected on the insulation shell, and power line is connected the left end of upper wiring board.The top of one end of described down terminal block is provided with fixed contact and is fixed on appropriate location in the insulation shell inner chamber, and described fixed contact is corresponding with aforementioned moving contact, and two contacts are in closure state when normally using, the live wire of the other end connection power supply of following terminal block.The thermosensitive bimetal that described upper wiring board is closely linked and constitutes for the sheet metal by two kinds of different heat expansion coefficients.Be provided with insulating barrier, spring and the push rod that resets in the described insulation shell, the left end of insulating barrier is fixedly connected on the upper left quarter of the push rod that resets, described spring is loaded between the left end and insulation shell sidewall of the push rod that resets, and the right-hand member of the push rod that resets is stretched in outside the insulation shell by the hole on the insulation shell.If environment temperature raise when circuit broke down, moving contact when environment temperature is raised to the response temperature that thermosensitive bimetal sets on the upper wiring board separates with the fixed contact on the play terminal block, and the push rod that at this moment resets moves the gap that makes it to push between two contacts and two contacts are separated and makes the circuit disconnection at drive insulating barrier under the spring thrust effect; Eliminate the back when fault and insulating barrier get final product from withdrawing between two contacts, avoided the automatically reset deficiency of thermoswitch meeting when environment temperature reduces like this if press the push rod that resets with hand will reclose circuit the time.

For the sensitivity that improves thermosensitive bimetal with reduce cost, described upper wiring board is made up of wiring copper sheet and thermosensitive bimetal two parts, and both are fixed together by rivet.

For convenience with being connected of power line, the described other end passes the insulation shell sidewall and is overhung at outside the insulation shell, power line can be welded on two terminal blocks, also can line pressing bolt be set, power line be connected on two terminal blocks by line pressing bolt in the part that upper wiring board and following terminal block are overhung at outside the insulation shell.

As further improvement of the utility model, the lower left quarter of the described push rod that resets is provided with a groove, and the right-hand member of spring is positioned in this groove, and spring can perk when the push rod that can guarantee like this to reset moved.

The beneficial effects of the utility model are: by insulating barrier, spring and the push rod that resets are set in insulation shell, utilize when environment temperature is raised to the response temperature that thermosensitive bimetal sets moving contact on the upper wiring board and fixed contact on the following terminal block to separate and move the gap that makes it to push between two contacts and two contacts are separated make the circuit disconnection at drive insulating barrier under the spring thrust effect by the push rod that resets; Pressing the push rod that resets with hand makes insulating barrier that circuit is connected.The utility model can be protected electric equipment more safely and reliably, and simple in structure, and processing and fabricating is convenient, and applicability is strong.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the vertical view of thermoswitch of the present utility model;

Fig. 2 is the vertical section schematic diagram of thermoswitch of the present utility model when normal operating conditions;

Fig. 3 is the vertical section schematic diagram of thermoswitch of the present utility model when off-state;

Fig. 4 is the front view of the another kind of structure of upper wiring board of the present utility model;

Fig. 5 is the vertical view of Fig. 4.

1. insulation shells among the figure, 2. upper wiring board 3. plays terminal block, the push rod that 4. resets, 5. spring, 6. insulating barrier, 7. moving contact, 8. fixed contact, 9. wiring copper sheet, 10. thermosensitive bimetal, 11. line pressing bolt.

Embodiment

In the accompanying drawings, thermoswitch is by insulation shell 1, upper wiring board 2, terminal block 3, insulating barrier 6, spring 5, reset push rod 4 and line pressing bolt 11 are formed down.The right lower quadrant of upper wiring board 2 is provided with moving contact 7, and left end is overhung at outside the insulation shell 1 and is provided with line pressing bolt 11, and power line is connected this end by line pressing bolt 11, and upper wiring board 2 is fixedly connected on the insulation shell 1.The top of one end of described down terminal block 3 is provided with fixed contact 8 and is fixed on appropriate location in insulation shell 1 inner chamber, aforementioned fixed contact 8 is corresponding with moving contact 7, two contacts are in closure state during normal the use, the other end of following terminal block 3 passes insulation shell 1 sidewall, and to be overhung at insulation shell 1 outer and be provided with line pressing bolt 11, and the live wire that connects power supply is connected this end by line pressing bolt 11.Described upper wiring board 2 is a thermosensitive bimetal, it is combined closely by the sheet metal of two kinds of different heat expansion coefficients and is a slice, the coefficient of expansion big for lower floor's coefficient of expansion little be the upper strata, inevitable when it utilizes thermosensitive bimetal to be heated to bent this phenomenon of the little lateral bending of the coefficient of expansion, thus drive moving contact 7 rapid actions and moving contact 7 and fixed contact 8 are separated.Insulating barrier 6 is made by insulating material, its left end is fixedly connected on the upper left quarter of the push rod 4 that resets, the lower left quarter of push rod 4 of resetting is provided with a groove, the right-hand member of described spring 5 is loaded in this groove, the left end of spring 5 contacts with insulation shell 1, and the right-hand member of the push rod 4 that resets is stretched in outside the insulation shell 1 by the hole on the insulation shell 1.If environment temperature raise when circuit broke down, moving contact 7 when environment temperature is raised to the response temperature that thermosensitive bimetal sets on the upper wiring board 2 separates with the fixed contact 8 on the following terminal block 3, and the push rod 4 that at this moment resets drives under spring 5 thrust that insulating barrier 6 moves the gap that makes it to push between two contacts and two contacts are separated and makes the circuit disconnection; Eliminate the back when fault and insulating barrier 6 get final product from withdrawing between two contacts, avoided the automatically reset deficiency of thermoswitch meeting when environment temperature reduces like this if press the push rod 4 that resets with hand will reclose circuit the time.

Described upper wiring board 2 is made up of wiring copper sheet 9 and thermosensitive bimetal 10 two parts, and both are fixed together by rivet, can improve the sensitivity of thermosensitive bimetal like this and reduces cost.

Claims

1, a kind of thermoswitch, comprise insulation shell, upper wiring board, following terminal block, the right lower quadrant of upper wiring board is provided with moving contact, the upper wiring board left end is fixedly connected on the insulation shell, the top of one end of described down terminal block is provided with fixed contact and is fixed on appropriate location in the insulation shell inner chamber, described fixed contact is corresponding with aforementioned moving contact, two contacts are in closure state during normal the use, it is characterized in that: the thermosensitive bimetal that described upper wiring board is closely linked and constitutes for the sheet metal by two kinds of different heat expansion coefficients; Be provided with insulating barrier, spring and the push rod that resets in the described insulation shell; The left end of described insulating barrier is fixedly connected on the upper left quarter of the push rod that resets, and described spring is arranged between the left end and insulation shell sidewall of the push rod that resets, and the right-hand member of the push rod that resets is stretched in outside the insulation shell by the hole on the insulation shell.

2, thermoswitch according to claim 1 is characterized in that: described upper wiring board is made up of wiring copper sheet and thermosensitive bimetal two parts, and both are fixed together by rivet.

3, thermoswitch according to claim 1 and 2 is characterized in that: the other end of described upper wiring board and following terminal block passes the insulation shell sidewall and is overhung at outside the insulation shell.

4, thermoswitch according to claim 3 is characterized in that: described upper wiring board and following terminal block are overhung at the outer part of insulation shell and are provided with line pressing bolt.

5, thermoswitch according to claim 1 is characterized in that: the lower left quarter of the described push rod that resets is provided with a groove, and the right-hand member of described spring is arranged in the groove of the push rod left end that resets.