CN213025939U

CN213025939U - Control circuit applying double-thermal compensation temperature controller

Info

Publication number: CN213025939U
Application number: CN202022221958.7U
Authority: CN
Inventors: 孙海东
Original assignee: Zhongshan Daohe Electric Industrial Co ltd
Current assignee: Zhongshan Daohe Electric Industrial Co ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-04-20
Anticipated expiration: 2030-09-30

Abstract

The utility model discloses a control circuit applying a double-thermal compensation temperature controller, which comprises a double-thermal compensation temperature controller, a mode setting switch, a lower heating wire component and an upper heating wire component, wherein a middle wiring sheet of the double-thermal compensation temperature controller is connected with the mode setting switch, can set the single-thermal compensation function of the double-thermal compensation temperature controller when the lower heating wire component and the upper heating wire component work simultaneously, a lower wiring sheet of the double-thermal compensation temperature controller is connected with the mode setting switch, can set the single-thermal compensation function of the lower heating wire component or the single-thermal compensation function of the double-thermal compensation temperature controller when the lower heating wire component or the lower heating wire component work independently, the temperature control device can realize the set change along with various temperature change forms of external heat sources, and can be applied to the temperature change of three external heat sources when a single lower heating wire component, a single lower heating wire group or a lower heating wire component and an upper heating wire component work simultaneously.

Description

Control circuit applying double-thermal compensation temperature controller

[ technical field ]

The utility model relates to an use control circuit of two thermal compensation temperature controllers.

[ background art ]

The existing temperature controllers on the market are single-heat compensation temperature controllers, so that a control circuit applying the single-heat compensation temperature controllers only has one external heat source temperature change form, if the external heat source is provided with multiple temperature change forms, if the external heat source is provided with a heating wire component and a lower heating wire component, the single lower heating wire component can be set to work in the working process, the single upper heating wire component works or the multiple temperature change forms of the upper heating wire component and the lower heating wire component working simultaneously are set, the existing single-heat compensation temperature controller control circuit is not suitable, and therefore improvement and development of the prior art are necessary.

[ contents of utility model ]

The utility model overcomes above-mentioned technique is not enough, provides a control circuit who uses two thermal compensation temperature controllers.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a control circuit applying a double-thermal compensation temperature controller comprises the double-thermal compensation temperature controller, a mode setting switch, a lower heating wire component and an upper heating wire component, wherein the double-thermal compensation temperature controller is provided with an upper wiring sheet of a public end, a middle wiring sheet of a single-thermal compensation mode connecting end and a lower wiring sheet of the double-thermal compensation mode connecting end, the mode setting switch can set the lower heating wire component to work independently, the upper heating wire component works independently or the lower heating wire component works independently and the upper heating wire component works simultaneously, the lower heating wire component and the upper heating wire component are respectively connected between the mode setting switch and a power supply zero line, the upper wiring sheet of the double-thermal compensation temperature controller is connected with a power supply live wire, the middle wiring sheet of the double-thermal compensation temperature controller is connected with the mode setting switch to set the lower heating wire component and the upper heating wire component to work simultaneously to realize the single-thermal compensation function of the double-thermal compensation temperature controller, the lower connection piece of the double-heat compensation temperature controller is connected with the mode setting switch to set the lower heating wire component to work alone or the upper heating wire component to work alone or the lower heating wire component to work alone so as to realize the double-heat compensation function of the double-heat compensation temperature controller.

The control circuit applying the double-thermal compensation temperature controller is characterized in that: two thermal compensation temperature controllers include porcelain core post, upper portion lug, middle part lug and lower part lug, and upper portion lug, middle part lug, lower part lug interval set up on the porcelain core post, its characterized in that: a temperature sensing action mechanism is arranged on the ceramic core column and is electrically connected with the upper lug plate, a first thermal compensation mechanism is connected in series between the temperature sensing action mechanism and the middle lug plate, and a second thermal compensation mechanism is connected in series between the middle lug plate and the lower lug plate; first thermal compensation mechanism, second thermal compensation mechanism all include the piece that generates heat, and the piece that generates heat is bent and is flat U-shaped structure and the U-shaped opening internal clamp that generates heat the piece is equipped with the mica sheet, and two tip and the mica sheet an organic whole of the piece that generates heat set firmly on the ceramic stem, and two tip of the piece that generates heat of first thermal compensation mechanism respectively with temperature sensing actuating mechanism, middle part lug conflict electricity are connected, two tip of the piece that generates heat of second thermal compensation mechanism respectively with temperature sensing actuating mechanism, lower part lug conflict electricity are connected.

The double-heat compensation temperature controller is characterized in that: the temperature sensing action mechanism comprises an upper reed, a fixed contact piece and a bimetallic strip, wherein the fixed end of the upper reed and an upper wiring piece are integrally fixed on a ceramic core column, the fixed contact piece is arranged on the ceramic core column below the upper reed at intervals, a movable contact piece matched with the fixed contact piece is arranged on the movable end of the upper reed, the fixed end of the bimetallic strip is arranged on the ceramic core column below the fixed contact piece, a linkage bolt is arranged between the movable end of the bimetallic strip and the movable end of the upper reed, two ends of a heating piece of the first thermal compensation mechanism are respectively in conflict electrical connection with the fixed contact piece and the middle wiring piece, the middle wiring piece is in conflict electrical connection with the bimetallic strip, and two ends of the heating piece of the second thermal compensation mechanism are respectively in conflict electrical connection.

The double-heat compensation temperature controller is characterized in that: the movable contact spring transversely sets up between last reed and the fixed contact piece, the one end of movable contact spring is integrative with the expansion end riveting of last reed, the other end of movable contact spring is located the top of fixed contact piece and is the break-make cooperation setting rather than, be equipped with the pressure regulating piece on the stiff end of going up the reed, be equipped with the elasticity reed between the expansion end of pressure regulating piece and the other end of movable contact spring, the upper end of porcelain core post transversely is equipped with the clamp plate, be equipped with pressure regulator on the clamp plate, pressure regulator's pressure regulating terminal is contradicted and is connected on the activity of pressure regulating piece.

The double-heat compensation temperature controller is characterized in that: the rivet penetrates through the ceramic core column, and the rivet sequentially connects the pressing plate, the upper reed, the upper wiring sheet, the fixed contact sheet, the heating sheet and the mica sheet of the first thermal compensation mechanism, the middle wiring sheet, the bimetallic strip, the heating sheet and the mica sheet of the second thermal compensation mechanism and the lower wiring sheet from top to bottom to form an integrated structure.

The double-heat compensation temperature controller is characterized in that: the lower end of the rivet is sleeved with a riveting fastener, conductive gaskets are respectively clamped between the fixed contact piece and the heating piece and the mica sheet fixed end of the first thermal compensation mechanism, and between the bimetallic strip and the heating piece and the mica sheet fixed end of the second thermal compensation mechanism, and insulating ceramic rings are respectively clamped between the pressing plate and the upper spring piece, between the upper lug piece and the fixed contact piece, and between the lower lug piece and the riveting fastener.

The utility model has the advantages that:

the control circuit of the double-heat compensation temperature controller of the utility model has the advantages that the control circuit can realize the setting change along with the external heat source with various temperature change forms, and can be applied to the temperature change of three external heat sources when a single lower heating wire component works, a single upper heating wire component works or a lower heating wire component and an upper heating wire component work simultaneously; the bimetallic strip of the double-thermal compensation temperature controller conducts the temperature of a heat source through the ceramic core column and the rivet, and the bimetallic strip is thermally compensated through the heating strip connected in series, so that the temperature rise hysteresis of the temperature controller is effectively reduced, and the accuracy and the sensitivity are improved; by arranging the three lugs and the two thermal compensation mechanisms, the working temperature change form of one thermal compensation mechanism or the working temperature change form of the two thermal compensation mechanisms can be set, and the change of the setting with the two working temperature change forms of an external heat source can be realized; the heating sheet of the thermal compensation mechanism is bent to be U-shaped and then the two ends of the heating sheet are insulated through the mica sheets, so that the heating sheet is matched with the porcelain core column to be integrally assembled, the whole structure is compact, the consistency of each part is good, the electric coupler does not need to be welded, the size of the temperature controller can be effectively reduced, and the assembly efficiency and the structural stability are improved.

[ description of the drawings ]

Fig. 1 is a schematic diagram of the circuit structure of the present invention;

FIG. 2 is a schematic view of the dual thermal compensation thermostat of the present invention;

fig. 3 is a side view of the dual thermal compensation thermostat of the present invention.

[ detailed description of the invention ]

The following description is further detailed with reference to the accompanying drawings and embodiments of the present invention:

as shown in fig. 1, a control circuit using a dual thermal compensation temperature controller includes a dual thermal compensation temperature controller 100, a mode setting switch 200, a lower heater assembly 300 and an upper heater assembly 400, the dual thermal compensation temperature controller 100 is provided with an upper connector 2 of a public connection end, a middle connector 3 of a single thermal compensation mode connection end and a lower connector 4 of a dual thermal compensation mode connection end, the mode setting switch 200 can set the lower heater assembly 300 to work alone, the upper heater assembly 400 to work alone or the lower heater assembly 300 to work alone and the upper heater assembly 400 to work simultaneously, the lower heater assembly 300 and the upper heater assembly 400 are respectively connected between the mode setting switch 200 and a power supply zero line, the upper connector 2 of the dual thermal compensation temperature controller 100 is connected with a power supply live wire, the middle connector 3 of the dual thermal compensation temperature controller 100 is connected with the mode setting switch 200 and the mode setting switch 200 can set the lower heater assembly 300 and the upper heater assembly 400 to work simultaneously The dual thermal compensation temperature controller 100 has a single thermal compensation function, and the dual thermal compensation temperature controller 100 has a dual thermal compensation function when the lower terminal plate 4 of the dual thermal compensation temperature controller 100 is connected to the mode setting switch 200 to set the lower heater assembly 300 to work alone or the upper heater assembly 400 to work alone or the lower heater assembly 300 to work alone; when only the lower heating wire assembly 300 needs to work, the mode setting switch 200 is set to a lower heating working mode, at this time, the upper and

lower connection pieces

2 and 4 of the dual thermal compensation temperature controller 100, the mode setting switch 200 and the lower heating wire assembly 300 form a power-on loop, and the dual thermal compensation temperature controller 100 performs dual heating wire thermal compensation work; similarly, when only the upper heating wire assembly 400 is needed to work, the mode setting switch 200 is set to be in the upper heating working mode, at this time, the upper wiring piece 2 and the lower wiring piece 4 of the dual-thermal compensation temperature controller 100, the mode setting switch 200 and the upper heating wire assembly 400 form a power-on loop, and the dual-thermal compensation temperature controller 100 performs dual-heating piece thermal compensation work; when the lower heater assembly 300 and the upper heater assembly 400 simultaneously operate, the mode setting switch 200 is set to an upper and lower simultaneous heating operation mode, at this time, the upper terminal piece 2 and the middle terminal piece 3 of the dual thermal compensation temperature controller 100, the mode setting switch 200, the lower heater assembly 300, and the upper heater assembly 400 form a power-on loop, and the dual thermal compensation temperature controller 100 performs a single heater thermal compensation operation.

As shown in fig. 2-3, a double-thermal compensation temperature controller, includes porcelain core column 1, upper portion lug piece 2, middle part lug piece 3 and lower part lug piece 4, and upper portion lug piece 2, middle

part lug piece

3, 4 intervals of lower part lug piece set up on porcelain core column 1, its characterized in that: a temperature sensing action mechanism is arranged on the ceramic core column 1 and is electrically connected with the upper wiring piece 2, a first thermal compensation mechanism is connected in series between the temperature sensing action mechanism and the middle wiring piece 3, and a second thermal compensation mechanism is connected in series between the middle wiring piece 3 and the lower wiring piece 4; the first thermal compensation mechanism and the second thermal compensation mechanism both comprise a heating sheet 51, the heating sheet 51 is bent to be of a flat U-shaped structure, mica sheets 52 are clamped in U-shaped openings of the heating sheet 51, two end parts of the heating sheet 51 and the mica sheets 52 are integrally and fixedly arranged on the ceramic core column 1, two end parts of the heating sheet 51 of the first thermal compensation mechanism are respectively abutted and electrically connected with the temperature sensing action mechanism and the middle wiring sheet 3, and two end parts of the heating sheet 51 of the second thermal compensation mechanism are respectively abutted and electrically connected with the temperature sensing action mechanism and the lower wiring sheet 4.

The upper lug plate 2 and the middle lug plate 3 can be set to be electrified according to the temperature change of an external heat source, so that the thermal compensation of a single heating plate is realized; the upper lug plate 2 and the lower lug plate 4 can be electrified to realize the double-heating-piece thermal compensation.

When the single heating sheet is used for thermal compensation, the temperature sensing action mechanism receives the temperature rise of an external heat source through the heat conduction effect of the ceramic core column 1, and the heating sheet 51 of the first thermal compensation mechanism connected in series in the circuit between the upper wiring sheet 2 and the middle wiring sheet 3 carries out temperature compensation on the memory metal of the temperature sensing action mechanism, so that the temperature rise of the temperature sensing action mechanism is synchronous with the external heat source, and the temperature control accuracy and sensitivity of the temperature controller are improved; similarly, when the double-heat-generating-piece thermal compensation is performed, the heat-generating piece 51 of the first thermal compensation mechanism and the heat-generating piece 51 of the second thermal compensation mechanism connected in series in the circuit between the upper connecting piece 2 and the lower connecting piece 4 perform temperature compensation on the memory metal of the temperature-sensing actuating mechanism respectively.

Wherein, the U-shaped structure that generates heat piece 51 adopted and through mica sheet 52 to its both ends insulation, the both ends of generating heat piece 51 are pasted in the both sides of mica sheet 52, thereby it realizes integrative assembly all to have the port with ceramic core post 1 adaptation on the tip of piece 51 and the mica sheet 52 simultaneously, two tip of the piece 51 that generates heat of first thermal compensation mechanism respectively with temperature sensing actuating mechanism, middle part lug 3 is contradicted the electricity and is connected, two tip of the piece 51 that generates heat of second thermal compensation mechanism respectively with temperature sensing actuating mechanism, lower part lug 4 is contradicted the electricity and is connected, the heat conduction efficiency between piece 51 and the temperature sensing actuating mechanism can be improved in the compact assembly, and two tip accessible ceramic core posts 1 of piece 51 that generates heat carry out heat-conduction, can further improve the thermal compensation efficiency and the accuracy nature of piece 51 that generates heat.

The temperature sensing action mechanism comprises an upper reed 61, a fixed contact piece 62 and a bimetallic strip 63, wherein the fixed end of the upper reed 61 and an upper wiring piece 2 are integrally and fixedly arranged on a ceramic core column 1, the fixed contact piece 62 is arranged on the ceramic core column 1 below the upper reed 61 at intervals, a movable contact piece 64 matched with the fixed contact piece 62 is arranged on the movable end of the upper reed 61, the fixed end of the bimetallic strip 63 is arranged on the ceramic core column 1 below the fixed contact piece 62, a linkage bolt 67 is arranged between the movable end of the bimetallic strip 63 and the movable end of the upper reed 61, two end parts of a heating piece 51 of the first thermal compensation mechanism are respectively abutted against and electrically connected with the fixed contact piece 62 and a middle wiring piece 3, the middle wiring piece 3 is abutted against and electrically connected with the bimetallic strip 63, and two end parts of the heating piece 51 of the second thermal compensation mechanism are respectively abutted against and.

Wherein the upper reed 61, the movable contact 64, the fixed contact 62, the heating plate 51 of the first thermal compensation mechanism and the bimetallic strip 63 in the temperature sensing action mechanism sequentially form an on-off circuit for single heating plate thermal compensation between the upper lug plate 2 and the middle lug plate 3; the upper spring leaf 61, the movable contact leaf 64, the fixed contact leaf 62, the heating sheet 51 of the first thermal compensation mechanism, the bimetallic strip 63 and the heating sheet 51 of the second thermal compensation mechanism in the temperature sensing action mechanism sequentially form an on-off circuit of double heating sheet thermal compensation between the upper and lower connection sheets 11. The bimetallic strip 63 receives the temperature rise of an external heat source through the ceramic core column 1, meanwhile, the heat generated by the heating strip 51 directly heats and compensates the bimetallic strip 63, the bimetallic strip 63 deforms when reaching a critical temperature value, the free end of the linkage bolt 67 and the upper reed 61 is pushed, so that the contact electrical connection state between the movable contact spring 64 and the fixed contact spring 62 is cut off, and at the moment, the main circuit in the temperature controller and the circuit of the external heating source are cut off; then, the temperature of the bimetal 63 drops along with the external heating source, the bimetal 63 is deformed again and returns to the initial state, and the upper spring 61 drives the movable contact piece 64 to realize the contact communication state with the fixed contact piece 62.

The movable contact spring 64 is transversely arranged between the upper spring leaf 61 and the fixed contact spring 62, one end of the movable contact spring 64 is riveted with the movable end of the upper spring leaf 61 into a whole, the other end of the movable contact spring 64 is arranged above the fixed contact spring 62 and is in on-off matching with the fixed contact spring, the fixed end of the upper spring leaf 61 is provided with a pressure regulating piece 65, an elastic spring leaf 66 is arranged between the movable end of the pressure regulating piece 65 and the other end of the movable contact spring 64, the upper end of the porcelain core column 1 is transversely provided with a pressure plate 71, the pressure plate 71 is provided with a pressure regulator 72, and a pressure regulating terminal of the pressure regulator 72 is; the pressure regulator 72 changes the height of the pressure regulating sheet 65 to regulate the pressure applied by the elastic spring 66 to the movable contact spring 64, thereby changing the kinetic energy required by the deformation of the bimetallic strip 63 and achieving the purpose of regulating the set temperature of the temperature controller.

A rivet 8 penetrates through the ceramic core column 1, and the rivet 8 sequentially connects the pressing plate 71, the upper spring sheet 61, the upper wiring sheet 2, the fixed contact sheet 62, the heating sheet 51 and the mica sheet 52 of the first thermal compensation mechanism, the middle wiring sheet 3, the bimetallic strip 63, the heating sheet 51 and the mica sheet 52 of the second thermal compensation mechanism and the lower wiring sheet 4 in series from top to bottom to form an integral structure; rivet 8 wear to locate in the porcelain core post 1 realize with temperature sensing actuating mechanism, thermal compensation mechanism between insulating, porcelain core post 1 concatenates above-mentioned part an organic whole, can effectively improve the stability of assembly efficiency and temperature controller, and can realize the uniformity of size between each part, reduction in production cost.

The lower end of the rivet 8 is sleeved with a riveting fixing part 9, conductive gaskets 10 are respectively clamped between the fixed contact piece 62 and the fixed ends of the heating piece 51 and the mica sheet 52 of the first thermal compensation mechanism, and between the bimetallic strip 63 and the fixed ends of the heating piece 51 and the mica sheet 52 of the second thermal compensation mechanism, and insulating ceramic rings 11 are respectively clamped between the pressing plate 71 and the upper spring piece 61, between the upper wiring piece 2 and the fixed contact piece 62, and between the lower wiring piece 4 and the riveting fixing part 9;

the riveting fastener 9 is an annular end piece, the temperature sensing action mechanism and the thermal compensation device are integrally connected in series from two ends after being assembled with the rivet 8, and the heating piece 51 and the mica sheet 52 of the first thermal compensation mechanism are arranged at intervals with the bimetallic strip 32 through the middle wiring piece 3; the bimetallic strip 32, the heating strip 51 and the mica sheet 52 of the second thermal compensation mechanism are arranged at intervals through the conductive gasket 10, so that the deformation space of the movable end of the bimetallic strip 32 is ensured, and the insulating ceramic ring 11 limits the distance between the components, so that the assembly efficiency can be effectively improved; and the integrated assembly can effectively reduce the whole volume, meet the structural design requirements of miniaturization and compaction of the temperature controller and improve the application flexibility of the temperature controller.

Claims

1. The utility model provides an use control circuit of two thermal compensation temperature controllers which characterized in that: the dual-thermal compensation temperature controller comprises a dual-thermal compensation temperature controller (100), a mode setting switch (200), a lower heating wire component (300) and an upper heating wire component (400), wherein the dual-thermal compensation temperature controller (100) is provided with an upper wiring sheet (2) of a public end, a middle wiring sheet (3) of a single-thermal compensation mode connecting end and a lower wiring sheet (4) of the dual-thermal compensation mode connecting end, the mode setting switch (200) can set the lower heating wire component (300) to work independently, the upper heating wire component (400) works independently or the lower heating wire component (300) works independently and the upper heating wire component (400) work simultaneously, the lower heating wire component (300) and the upper heating wire component (400) are respectively connected between the mode setting switch (200) and a power supply zero line, the upper wiring sheet (2) of the dual-thermal compensation temperature controller (100) is connected with a power supply live wire, the middle wiring sheet (3) of the dual-thermal compensation temperature controller (100) and the mode setting switch (200) are connected with the mode The single heat compensation function of the double heat compensation temperature controller (100) is realized when the heating wire component (300) and the upper heating wire component (400) work simultaneously, and the lower wiring sheet (4) of the double heat compensation temperature controller (100) is connected with the mode setting switch (200) and can be set to work independently of the lower heating wire component (300) or work independently of the upper heating wire component (400) or work independently of the lower heating wire component (300) when the mode setting switch (200) is connected, so that the double heat compensation function of the double heat compensation temperature controller (100) is realized.

2. The control circuit of claim 1, wherein the control circuit comprises: the double-thermal compensation temperature controller (100) comprises a ceramic core column (1), an upper wiring piece (2), a middle wiring piece (3) and a lower wiring piece (4), wherein the upper wiring piece (2), the middle wiring piece (3) and the lower wiring piece (4) are arranged on the ceramic core column (1) at intervals, a temperature sensing action mechanism is arranged on the ceramic core column (1), the temperature sensing action mechanism is electrically connected with the upper wiring piece (2), a first thermal compensation mechanism is connected in series between the temperature sensing action mechanism and the middle wiring piece (3), and a second thermal compensation mechanism is connected in series between the middle wiring piece (3) and the lower wiring piece (4); the first thermal compensation mechanism and the second thermal compensation mechanism respectively comprise a heating sheet (51), the heating sheet (51) is bent to be of a flat U-shaped structure, mica sheets (52) are clamped in U-shaped openings of the heating sheet (51), two end parts of the heating sheet (51) and the mica sheets (52) are integrally and fixedly arranged on the ceramic core column (1), two end parts of the heating sheet (51) of the first thermal compensation mechanism are respectively in conflict electrical connection with the temperature sensing action mechanism and the middle wiring sheet (3), and two end parts of the heating sheet (51) of the second thermal compensation mechanism are respectively in conflict electrical connection with the temperature sensing action mechanism and the lower wiring sheet (4).

3. The control circuit of claim 2, wherein the control circuit comprises: the temperature sensing action mechanism comprises an upper reed (61), a fixed contact piece (62) and a bimetallic strip (63), wherein the fixed end of the upper reed (61) and an upper wiring piece (2) are integrally and fixedly arranged on the porcelain core column (1) below the upper reed (61), the fixed contact piece (62) is arranged on the porcelain core column (1) below the upper reed (61) at intervals, a movable end of the upper reed (61) is provided with a movable contact piece (64) matched with the fixed contact piece (62), the fixed end of the bimetallic strip (63) is arranged on the porcelain core column (1) below the fixed contact piece (62), a linkage bolt (67) is arranged between the movable end of the bimetallic strip (63) and the movable end of the upper reed (61), two end parts of a heating piece (51) of the first thermal compensation mechanism are respectively abutted against and electrically connected with the fixed contact piece (62) and the middle wiring piece (3), the middle wiring piece (3) is electrically connected with the bimetallic strip (63), two end parts of the heating piece (51) of the second thermal compensation mechanism are respectively abutted against the bimetallic strip And (4) connecting.

4. The control circuit of claim 3, wherein the control circuit comprises: the movable contact spring (64) transversely sets up between last reed (61) and fixed contact piece (62), the one end of movable contact spring (64) is integrative with the expansion end riveting of last reed (61), the top of fixed contact piece (62) is located and is the break-make cooperation with it to the other end of movable contact spring (64) and sets up, be equipped with pressure regulating piece (65) on the stiff end of last reed (61), be equipped with between the expansion end of pressure regulating piece (65) and the other end of movable contact spring (64) elasticity reed (66), the upper end of porcelain core post (1) transversely is equipped with clamp plate (71), be equipped with pressure regulator (72) on clamp plate (71), the pressure regulating terminal conflict of pressure regulator (72) is connected on the activity of pressure regulating piece (65) is served.

5. The control circuit of claim 4, wherein the control circuit comprises: rivet (8) are arranged in the ceramic core column (1) in a penetrating mode, and the rivet (8) sequentially connects the pressing plate (71), the upper spring (61), the upper wiring piece (2), the fixed contact piece (62), the heating piece (51) and the mica sheet (52) of the first thermal compensation mechanism, the middle wiring piece (3), the bimetallic strip (63), the heating piece (51) and the mica sheet (52) of the second thermal compensation mechanism and the lower wiring piece (4) in series from top to bottom to form an integral structure.

6. The control circuit of claim 5, wherein the control circuit comprises: the lower pot head of rivet (8) is equipped with riveting firmware (9), all press from both sides between fixed contact (62) and the heating element (51) of first thermal compensation mechanism and mica sheet (52) stiff end, between bimetallic strip (63) and the heating element (51) of second thermal compensation mechanism and mica sheet (52) stiff end and be equipped with conductive gasket (10), all press from both sides between clamp plate (71) and last reed (61), between upper portion lug (2) and fixed contact (62), between lower part lug (4) and riveting firmware (9) and be equipped with insulating ceramic ring (11).