阅读说明：本技术 一种薄片型温度传感器 (Slice type temperature sensor ) 是由 程力 赵文 于 2020-08-04 设计创作，主要内容包括：本发明属于温度传感器技术领域,具体的说是一种薄片型温度传感器,包括双金属片,所述双金属片上连接有两根导线,所述双金属片分为一号金属片和二号金属片,所述一号金属片的热膨胀系数大于二号金属片的热膨胀系数,所述一号金属片远离二号金属片的一侧设有三号金属片,所述三号金属片的热膨胀系数大于一号金属片,所述二号金属片远离一号金属片的一侧设有四号金属片,所述四号金属片的热膨胀系数小于二号金属片；本发明通过将双金属片的末端增设热膨胀系数更大的金属片,从而使得双金属片的弯弧角度扩大,双金属片的弯弧角度增大了双金属片的控制范围,进而提高了温度传感器的适用范围。(The invention belongs to the technical field of temperature sensors, and particularly relates to a sheet-type temperature sensor which comprises a bimetallic strip, wherein two wires are connected onto the bimetallic strip, the bimetallic strip is divided into a first metal sheet and a second metal sheet, the thermal expansion coefficient of the first metal sheet is greater than that of the second metal sheet, one side, away from the second metal sheet, of the first metal sheet is provided with a third metal sheet, the thermal expansion coefficient of the third metal sheet is greater than that of the first metal sheet, one side, away from the first metal sheet, of the second metal sheet is provided with a fourth metal sheet, and the thermal expansion coefficient of the fourth metal sheet is less than that of the second metal sheet; according to the invention, the metal sheet with a larger thermal expansion coefficient is additionally arranged at the tail end of the bimetallic strip, so that the bending angle of the bimetallic strip is enlarged, the control range of the bimetallic strip is enlarged by the bending angle of the bimetallic strip, and the application range of the temperature sensor is further enlarged.)

1. The utility model provides a thin slice type temperature sensor, includes bimetallic strip (1), be connected with two wire (2) on bimetallic strip (1), its characterized in that: bimetallic strip (1) divide into sheetmetal (3) and No. two sheetmetals (4), the coefficient of thermal expansion of sheetmetal (3) is greater than the coefficient of thermal expansion of No. two sheetmetals (4), one side that No. two sheetmetals (4) were kept away from in sheetmetal (3) is equipped with No. three sheetmetals (5), the coefficient of thermal expansion of No. three sheetmetals (5) is greater than No. one sheetmetal (3), one side that No. one sheetmetal (3) was kept away from in No. two sheetmetals (4) is equipped with No. four sheetmetals (6), the coefficient of thermal expansion of No. four sheetmetals (6) is less than No. two sheetmetals (4).

2. The sheet-type temperature sensor according to claim 1, wherein: one side that a sheetmetal (3) and No. two sheetmetals (4) kept away from each other all is equipped with cutting joint (7) more than two, cutting joint (7) are located the one end that wire (2) were kept away from to a sheetmetal (3) and No. two sheetmetals (4), one side that sheetmetal (3) and No. two sheetmetals (4) kept away from each other is equipped with the recess, No. three sheetmetals (5) and No. four sheetmetals (6) are located the recess that corresponds respectively, No. three sheetmetals (5) and No. four sheetmetals (6) surface all are equipped with expansion joint (8) more than two.

3. The sheet-type temperature sensor according to claim 2, wherein: in No. three sheetmetal (5) keep away from expansion joint (8) more than two of sheetmetal (3), No. four sheetmetal (6) all are equipped with telescopic link (9) more than two in expansion joint (8) more than two that are close to No. two sheetmetals (4), the length direction of telescopic link (9) is unanimous with the length direction of a sheetmetal (3), it has the air to fill in telescopic link (9) inner chamber.

4. A sheet-type temperature sensor according to claim 3, wherein: in No. three sheetmetals (5) keep away from expansion joint (8) more than two of sheetmetal (3), No. four sheetmetals (6) all rotate in expansion joint (8) more than two of No. two sheetmetals (4) and install the linkage more than two, every linkage includes connecting rod (10) and No. two connecting rods (11), and is adjacent connecting rod (10) and No. two connecting rods (11) rotate to be connected, are close to be fixed with shifting block (12) on telescopic link (9) lateral wall of connecting rod (10), shifting block (12) are used for controlling the position of linkage.

5. The sheet-type temperature sensor according to claim 4, wherein: sheet metal (3) and No. two sheet metal (4) are the halfpace column structure, the thickness value and the width value that wire (2) one end was kept away from to sheet metal (3) and No. two sheet metal (4) are all less than the thickness value and the width value of the other end separately.

6. The sheet-type temperature sensor according to claim 5, wherein: the thermal expansion coefficients of a first connecting rod (10) and a second connecting rod (11) in an expansion joint (8) of a fourth metal sheet (6) are smaller than the thermal expansion coefficients of a corresponding first connecting rod (10) and a corresponding second connecting rod (11) in the expansion joint (8) of a third metal sheet (5), and the gas quantity in the inner cavity of a telescopic rod (9) in the expansion joint (8) of the fourth metal sheet (6) is smaller than the gas quantity in the inner cavity of the telescopic rod (9) in the expansion joint (8) of the third metal sheet (5).

7. The sheet-type temperature sensor according to claim 2, wherein: the depth value of cutting seam (7) is one third to one half of bimetallic strip (1) thickness value, cutting seam (7) are used for improving bimetallic strip (1)'s deformability.

8. A sheet-type temperature sensor according to claim 3, wherein: the air is dehumidified and deoxidized, and the air is used for generating thrust after expansion.

9. The sheet-type temperature sensor according to claim 6, wherein: and gaps are arranged between the two side walls of the third metal sheet (5) and the four metal sheet (6) and the side walls of the grooves, and the gaps are used for reducing friction between the third metal sheet (5) and the four metal sheet (6) and the bimetallic strip (1) when the third metal sheet and the fourth metal sheet expand.

10. The sheet-type temperature sensor according to claim 9, wherein: the surfaces of the first metal sheet (3), the second metal sheet (4), the third metal sheet (5) and the fourth metal sheet (6) are coated with anti-oxidation coatings, and the anti-oxidation coatings are used for ensuring that the sensor does not generate chemical reaction when being heated.

11. The sheet-type temperature sensor according to claim 10, wherein: the thickness value of the third metal sheet (5) is larger than that of the fourth metal sheet (6).

Technical Field

The invention belongs to the technical field of temperature sensors, and particularly relates to a sheet type temperature sensor.

Background

A temperature sensor is a sensor that senses temperature and converts it into a usable output signal. The temperature sensor is the core part of the temperature measuring instrument and has a plurality of varieties. The measurement method can be divided into a contact type and a non-contact type, and the measurement method can be divided into a thermal resistor and a thermocouple according to the characteristics of sensor materials and electronic elements.

A thermal bimetal is a relatively simple self-controlling element for achieving temperature control. It consists of two layers of metals with different coefficients of thermal expansion. The layer with a large coefficient of thermal expansion is the active layer, and the layer with a small coefficient of thermal expansion is called the passive layer. When the thermal bimetallic strip is heated, the free expansion length of the active layer is larger than that of the passive layer, but the two layers are firmly combined together, so that the thermal bimetallic strip is bent into an arc shape. The opposite is true when cooling down. The characteristic that the thermal bimetallic strip is bent when the temperature changes is utilized, the effects of controlling and adjusting the temperature can be achieved, and the purpose of automatic control is achieved.

Disclosure of Invention

In order to make up for the defects of the prior art, the invention provides the sheet-type temperature sensor, the metal sheet with a larger thermal expansion coefficient is additionally arranged at the tail end of the bimetallic strip, so that the arc bending angle of the bimetallic strip is enlarged, the control range of the bimetallic strip is enlarged by the arc bending angle of the bimetallic strip, and the application range of the temperature sensor is further enlarged.

The technical scheme adopted by the invention for solving the technical problems is as follows: the sheet type temperature sensor comprises a bimetallic strip, two wires are connected onto the bimetallic strip, the bimetallic strip is divided into a first metal sheet and a second metal sheet, the thermal expansion coefficient of the first metal sheet is greater than that of the second metal sheet, a third metal sheet is arranged on one side, away from the second metal sheet, of the first metal sheet, the thermal expansion coefficient of the third metal sheet is greater than that of the first metal sheet, a fourth metal sheet is arranged on one side, away from the first metal sheet, of the second metal sheet, and the thermal expansion coefficient of the fourth metal sheet is less than that of the second metal sheet; when the bimetallic strip temperature sensor works, the existing bimetallic strip temperature sensor can only perform single closing and separation and cannot continuously react on the continuous change of the temperature after closing, so that the use of the bimetallic strip temperature sensor has limitation, and the problem is solved by the bimetallic strip temperature sensor; the third metal sheet and the fourth metal sheet are respectively arranged on the two sides of the bimetallic strip, so that the third metal sheet and the fourth metal sheet are heated to expand when the bimetallic strip is heated; because the thermal expansion coefficient of the third metal sheet is greater than that of the first metal sheet, and the thermal expansion coefficient of the second metal sheet is greater than that of the fourth metal sheet, one end of the bimetallic strip, which is far away from the lead, is provided with a bent arc which is larger than that of the bimetallic strip, so that the bimetallic strip can continue to carry out secondary control on the circuit after finishing single control operation; after the bimetallic strip is cooled, one end of the bimetallic strip, which is far away from the lead, also generates a larger arc; according to the invention, the metal sheet with a larger thermal expansion coefficient is additionally arranged at the tail end of the bimetallic strip, so that the bending angle of the bimetallic strip is enlarged, the control range of the bimetallic strip is enlarged by the bending angle of the bimetallic strip, and the application range of the temperature sensor is further enlarged.

Preferably, more than two cutting seams are arranged on the sides, away from each other, of the first metal sheet and the second metal sheet, the cutting seams are located at the ends, away from the lead, of the first metal sheet and the second metal sheet, grooves are formed in the sides, away from each other, of the first metal sheet and the second metal sheet, the third metal sheet and the fourth metal sheet are located in the corresponding grooves respectively, and more than two expansion joints are arranged on the surfaces of the third metal sheet and the fourth metal sheet; when the sensor works, if the bimetallic strip needs to generate larger arc, the length of the bimetallic strip needs to be prolonged, and the manufacturing cost of the sensor is increased due to the fact that the length of the bimetallic strip is prolonged; the cutting seams are arranged on the first metal sheet and the second metal sheet, so that the extrusion deformation generated when the first metal sheet and the second metal sheet are bent is reduced, the first metal sheet and the second metal sheet are bent more easily, and the normal bending of one end, far away from a lead, of the bimetallic strip is ensured; meanwhile, due to the arrangement of the expansion joint, the third metal sheet with a larger thermal expansion coefficient cannot pop out of the groove when deforming, and the bonding of the third metal sheet and the first metal sheet is ensured, so that the normal work of the sensor is ensured; the arrangement of the groove not only reduces the thickness of the bimetallic strip, thereby ensuring that the bimetallic strip can be normally bent, but also reduces the manufacturing cost of the bimetallic strip and further reduces the manufacturing cost of the sensor.

Preferably, more than two telescopic rods are arranged in more than two expansion joints of the third metal sheet far away from the first metal sheet and more than two expansion joints of the fourth metal sheet close to the second metal sheet, the length direction of each telescopic rod is consistent with the length direction of the first metal sheet, and air is filled in the inner cavity of each telescopic rod; when the double-metal-sheet bending machine works, the shorter the length of the double metal sheet is, the lower the manufacturing cost can be, and the length of the double metal sheet depends on the bending capacity of the third metal sheet and the fourth metal sheet to the double metal sheet; by arranging the telescopic rod, air in the telescopic rod expands when being heated, and the expansion degree of the telescopic rod is larger than that of the third metal sheet because the thermal expansion coefficient of the air is larger than that of the metal; the expansion link extrudes the expansion joint of the third metal sheet in the process of extension, so that the third metal sheet is bent; the third metal sheet bends and simultaneously bends the bimetallic strip, so that the bending of the bimetallic strip is intensified, the length of the bimetallic strip can be shortened to save the cost, and the manufacturing cost of the sensor is reduced; meanwhile, the sensitivity of the invention is better due to the accelerated bending of the expansion link to the bimetallic strip, thereby improving the measurement accuracy of the invention.

Preferably, more than two connecting rod groups are rotatably mounted in more than two expansion joints of the third metal sheet far away from the first metal sheet and more than two expansion joints of the fourth metal sheet close to the second metal sheet, each connecting rod group comprises a first connecting rod and a second connecting rod, the adjacent first connecting rod and the adjacent second connecting rod are rotatably connected, a shifting block is fixed on the side wall of the expansion link close to the first connecting rod, and the shifting block is used for controlling the position of the connecting rod group; when the telescopic rod works, the telescopic rod has certain requirements on manufacturing cost and manufacturing difficulty, so that the manufacturing cost of the sensor is increased; the connecting rod group drives the shifting block to move in the extension process of the telescopic rod, so that the shifting block extrudes the first connecting rod and the second connecting rod; the first connecting rod and the second connecting rod are deformed by the extrusion of the shifting block, so that the expansion joint is extruded by the first connecting rod and the second connecting rod; the connecting rod group makes the deformation degree of No. three sheetmetals and No. four sheetmetals further increase to the extrusion at expansion joint to improve the measurement sensitivity of sensor, also reduced the manufacturing cost of sensor.

Preferably, the first metal sheet and the second metal sheet are in a ladder-shaped structure, and the thickness value and the width value of one end, far away from the lead, of each of the first metal sheet and the second metal sheet are smaller than those of the other end of each of the first metal sheet and the second metal sheet; when the device works, the deformation degree of the second metal sheet has a direct relation with the thickness and the width of the second metal sheet; the first metal sheet and the second metal sheet are arranged into a ladder-shaped structure, so that one end, away from the lead, of the bimetallic strip is easy to deform, the sensor is easy to bend under the action of the telescopic rod and the connecting rod group, and the reaction sensitivity of the sensor is improved; the sensitivity of the sensor to the temperature is improved due to the improvement of the reaction sensitivity of the sensor, so that the measurement precision of the sensor is improved.

Preferably, the thermal expansion coefficients of the first connecting rod and the second connecting rod in the expansion joint of the fourth metal sheet are smaller than the thermal expansion coefficients of the first connecting rod and the second connecting rod corresponding to the expansion joint of the third metal sheet, and the gas volume in the inner cavity of the expansion link in the expansion joint of the fourth metal sheet is smaller than the gas volume in the inner cavity of the expansion link in the expansion joint of the third metal sheet; when the sensor works, if the gas quantity in the inner cavities of all the telescopic rods is the same, the telescopic rods in the fourth metal sheet affect the bending of the bimetallic strip, so that the normal work of the sensor is affected; the elongation rate of the telescopic rod in the fourth metal sheet is smaller than that of the expansion joint in the third metal sheet by reducing the amount of gas in the inner cavity of the telescopic rod in the fourth metal sheet, so that the total acting force applied to the sensor during bending is inclined to the bending direction of the sensor, the bending effect of the sensor is further improved, and the situation that the bending is blocked or cannot be bent is avoided; the difference of the thermal expansion coefficients of the first connecting rod and the second connecting rod is the same as the difference of the elongation percentage of the expansion joint, the action effect of the connecting rod group in the third metal sheet on the bimetallic strip is greater than that of the connecting rod group in the fourth metal sheet, so that the bimetallic strip is more prone to bending in the set direction, and the normal work of the sensor is ensured.

Preferably, the depth value of the cutting seam is one third to one half of the thickness value of the bimetallic strip, and the cutting seam is used for improving the deformation capacity of the bimetallic strip; during operation, the cutting seam is too deep and can influence the intensity of bimetallic strip, and the cutting seam is too shallow and can influence the deformation of bimetallic strip, and the normal deformation and the normal intensity of bimetallic strip have been guaranteed to the degree of depth value of cutting seam.

Preferably, the air is dehumidified and deoxidized, and the air is used for generating thrust after expansion; during operation, the air is dehumidified and deoxidized to reduce the air humidity in the telescopic rod, so that the degree of oxidation reaction of the telescopic rod in the working process is reduced, and the normal use of the telescopic rod is guaranteed.

Preferably, a gap is formed between the two side walls of the third metal sheet and the fourth metal sheet and the side wall of the groove, and the gap is used for reducing friction between the third metal sheet and the fourth metal sheet and the bimetallic strip when the third metal sheet and the fourth metal sheet expand; during operation, contactless between its two lateral walls and the recess lateral wall when No. three sheetmetals and No. four sheetmetals expand for its two lateral walls can not contact with the bimetallic strip when No. three sheetmetals and No. four sheetmetals expand, thereby make the sensor can normally rotate, avoid leading to the rotation because of the friction is too big and hinder the condition emergence.

Preferably, the surfaces of the first metal sheet, the second metal sheet, the third metal sheet and the fourth metal sheet are coated with anti-oxidation coatings, and the anti-oxidation coatings are used for ensuring that the sensor does not generate chemical reaction when being heated; when the sensor works, the first metal sheet, the second metal sheet, the third metal sheet and the fourth metal sheet can not react with air by coating the anti-oxidation coating, so that the sensor is ensured to be used for a long time.

Preferably, the thickness value of the third metal sheet is larger than that of the fourth metal sheet; during operation, the thickness value of the third metal sheet is larger than that of the fourth metal sheet, so that the thermal expansion degree of the third metal sheet is larger, the deformation degree of the sensor is larger, and the measurement accuracy of the sensor is improved.

The invention has the following beneficial effects:

1. according to the sheet-type temperature sensor, the metal sheet with a larger thermal expansion coefficient is additionally arranged at the tail end of the bimetallic strip, so that the bending angle of the bimetallic strip is enlarged, the control range of the bimetallic strip is enlarged by the bending angle of the bimetallic strip, and the application range of the temperature sensor is further enlarged.

2. According to the sheet-type temperature sensor, the bimetallic strip is subjected to accelerated bending through the arrangement of the telescopic rod and the connecting rod group, so that the sensor is more easily subjected to bending deformation, the manufacturing cost of the sensor is reduced, and the measuring precision of the sensor is improved.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a three-dimensional view of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is an exploded view of the present invention;

FIG. 4 is a schematic view of the working state of the present invention;

in the figure: 1. a bimetal; 2. a wire; 3. a first metal sheet; 4. a second metal sheet; 5. a third metal sheet; 6. a fourth metal sheet; 7. cutting a seam; 8. an expansion joint; 9. a telescopic rod; 10. a first connecting rod; 11. a second connecting rod; 12. and (5) shifting blocks.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 4, the thin-sheet type temperature sensor according to the present invention includes a bimetallic strip 1, two wires 2 are connected to the bimetallic strip 1, the bimetallic strip 1 is divided into a first metal sheet 3 and a second metal sheet 4, a thermal expansion coefficient of the first metal sheet 3 is greater than a thermal expansion coefficient of the second metal sheet 4, a third metal sheet 5 is disposed on a side of the first metal sheet 3 away from the second metal sheet 4, the thermal expansion coefficient of the third metal sheet 5 is greater than that of the first metal sheet 3, a fourth metal sheet 6 is disposed on a side of the second metal sheet 4 away from the first metal sheet 3, and the thermal expansion coefficient of the fourth metal sheet 6 is less than that of the second metal sheet 4; when the temperature sensor works, the existing bimetallic strip 1 temperature sensor can only perform single closing and separation, and cannot continuously react on the continuous change of the temperature after closing, so that the use of the bimetallic strip 1 temperature sensor has limitation, and the temperature sensor solves the problem; the third metal sheet 5 and the fourth metal sheet 6 are respectively arranged on the two sides of the bimetallic strip 1, so that the third metal sheet 5 and the fourth metal sheet 6 are heated to expand when the bimetallic strip 1 is heated; because the thermal expansion coefficient of the third metal sheet 5 is greater than that of the first metal sheet 3, and the thermal expansion coefficient of the second metal sheet 4 is greater than that of the fourth metal sheet 6, one end of the bimetallic strip 1, which is far away from the lead 2, generates a larger bending arc than that of the bimetallic strip 1, and the bimetallic strip 1 can continue to perform secondary control on a circuit after finishing single control operation; after the bimetallic strip 1 is cooled, one end of the bimetallic strip, which is far away from the lead 2, also generates a larger arc; according to the invention, the metal sheet with a larger thermal expansion coefficient is additionally arranged at the tail end of the bimetallic strip 1, so that the arc bending angle of the bimetallic strip 1 is enlarged, the control range of the bimetallic strip 1 is enlarged by the arc bending angle of the bimetallic strip 1, and the application range of the temperature sensor is further enlarged.

As a specific embodiment of the present invention, two or more cutting seams 7 are respectively disposed on the sides of the first metal sheet 3 and the second metal sheet 4 away from each other, the cutting seams 7 are located at the ends of the first metal sheet 3 and the second metal sheet 4 away from the lead 2, grooves are disposed on the sides of the first metal sheet 3 and the second metal sheet 4 away from each other, the third metal sheet 5 and the fourth metal sheet 6 are respectively located in the corresponding grooves, and two or more expansion joints 8 are disposed on the surfaces of the third metal sheet 5 and the fourth metal sheet 6; when the sensor works, if the bimetallic strip 1 needs to generate larger arc, the length of the bimetallic strip 1 needs to be prolonged, and the manufacturing cost of the sensor is increased due to the fact that the length of the bimetallic strip 1 is prolonged; the cutting seams 7 are arranged on the first metal sheet 3 and the second metal sheet 4, so that the extrusion deformation generated when the first metal sheet 3 and the second metal sheet 4 are bent is reduced, the first metal sheet 3 and the second metal sheet 4 are bent more easily, and the normal bending of one end of the bimetallic strip 1, which is far away from the lead 2, is ensured; meanwhile, the expansion joint 8 enables the third metal sheet 5 with a larger thermal expansion coefficient not to pop out of the groove when deforming, and ensures the bonding of the third metal sheet 5 and the first metal sheet 3, thereby ensuring the normal work of the sensor; the arrangement of the groove not only reduces the thickness of the bimetallic strip 1, thereby ensuring that the bimetallic strip 1 can be normally bent, but also reduces the manufacturing cost of the bimetallic strip 1 and further reduces the manufacturing cost of the sensor.

As a specific embodiment of the present invention, two or more expansion links 9 are respectively disposed in two or more expansion joints 8 of the third metal sheet 5 far from the first metal sheet 3 and two or more expansion joints 8 of the fourth metal sheet 6 near the second metal sheet 4, the length direction of the expansion links 9 is the same as the length direction of the first metal sheet 3, and an inner cavity of the expansion link 9 is filled with air; when the double-metal strip bending machine works, the shorter the length of the double-metal strip 1 is, the lower the manufacturing cost can be, and the length of the double-metal strip 1 depends on the bending capacity of the third metal strip 5 and the fourth metal strip 6 to the double-metal strip 1; by arranging the telescopic rod 9, the air in the telescopic rod 9 expands when being heated, and the expansion degree of the telescopic rod 9 is larger than that of the third metal sheet 5 because the thermal expansion coefficient of the air is larger than that of the metal; the expansion link 9 extrudes the expansion joint 8 of the third metal sheet 5 in the process of extension, so that the third metal sheet 5 is bent; the third metal sheet 5 bends and simultaneously bends the bimetallic strip 1, so that the bending of the bimetallic strip 1 is intensified, the length of the bimetallic strip 1 can be shortened to save the cost, and the manufacturing cost of the sensor is reduced; meanwhile, the telescopic rod 9 accelerates the bending of the bimetallic strip 1, so that the sensitivity of the invention is better, and the measurement precision of the invention is improved.

As a specific embodiment of the present invention, more than two connecting rod sets are rotatably installed in more than two expansion joints 8 of the third metal sheet 5 far away from the first metal sheet 3 and more than two expansion joints 8 of the fourth metal sheet 6 near the second metal sheet 4, each connecting rod set includes a first connecting rod 10 and a second connecting rod 11, the adjacent first connecting rod 10 and second connecting rod 11 are rotatably connected, a shifting block 12 is fixed on the side wall of the expansion link 9 near the first connecting rod 10, and the shifting block 12 is used for controlling the position of the connecting rod set; when the sensor works, the telescopic rod 9 has certain requirements on manufacturing cost and manufacturing difficulty, so that the manufacturing cost of the sensor is increased; through the arrangement of the connecting rod group, the shifting block 12 is driven to move in the process of extending the telescopic rod 9, so that the shifting block 12 extrudes the first connecting rod 10 and the second connecting rod 11; the first connecting rod 10 and the second connecting rod 11 are deformed by the extrusion of the shifting block 12, so that the expansion joint 8 is extruded by the first connecting rod 10 and the second connecting rod 11; the extrusion of connecting rod group to expansion joint 8 makes No. three sheetmetals 5 and No. four sheetmetals 6's deformation degree further increase to improve the measuring sensitivity of sensor, also reduced the manufacturing cost of sensor.

As a specific embodiment of the present invention, the first metal sheet 3 and the second metal sheet 4 are in a ladder-shaped structure, and the thickness value and the width value of one end of the first metal sheet 3 and the second metal sheet 4 away from the lead 2 are both smaller than the thickness value and the width value of the other end of each of the two ends; when the metal sheet is in work, the deformation degree of the second metal sheet 4 has a direct relation with the thickness and the width of the second metal sheet; the first metal sheet 3 and the second metal sheet 4 are arranged into a ladder-shaped structure, so that one end, far away from the lead 2, of the bimetallic strip 1 is easy to deform, the sensor is easy to bend under the action of the telescopic rod 9 and the connecting rod group, and the reaction sensitivity of the sensor is improved; the sensitivity of the sensor to the temperature is improved due to the improvement of the reaction sensitivity of the sensor, so that the measurement precision of the sensor is improved.

As a specific embodiment of the present invention, the thermal expansion coefficients of the first connecting rod 10 and the second connecting rod 11 in the expansion joint 8 of the fourth metal sheet 6 are smaller than the thermal expansion coefficients of the first connecting rod 10 and the second connecting rod 11 corresponding to the expansion joint 8 of the third metal sheet 5, and the amount of gas in the inner cavity of the expansion link 9 in the expansion joint 8 of the fourth metal sheet 6 is smaller than the amount of gas in the inner cavity of the expansion link 9 in the expansion joint 8 of the third metal sheet 5; when the sensor works, if the gas quantity in the inner cavities of all the telescopic rods 9 is the same, the telescopic rods 9 in the fourth metal sheet 6 influence the bending of the bimetallic strip 1, so that the normal work of the sensor is influenced; the elongation of the telescopic rod 9 in the fourth metal sheet 6 is smaller than that of the telescopic seam 8 in the third metal sheet 5 by reducing the amount of gas in the inner cavity of the telescopic rod 9 in the fourth metal sheet 6, so that the total acting force applied to the sensor during bending is inclined to the bending direction of the sensor, the bending effect of the sensor is improved, and the situation that the bending is blocked or cannot be bent is avoided; the difference of the thermal expansion coefficients of the first connecting rod 10 and the second connecting rod 11 is the same as the difference of the elongation rates of the expansion joints 8, the action effect of the connecting rod group in the third metal sheet 5 on the bimetallic strip 1 is greater than that of the connecting rod group in the fourth metal sheet 6, so that the bimetallic strip 1 is more inclined to bend in the set direction, and the normal work of the sensor is ensured.

As a specific embodiment of the present invention, the depth value of the cut 7 is one third to one half of the thickness value of the bimetal strip 1, and the cut 7 is used for improving the deformability of the bimetal strip 1; during operation, the too deep of cutting seam 7 can influence the intensity of bimetallic strip 1, and the too shallow of cutting seam 7 can influence the deformation of bimetallic strip 1, and the normal deformation and the normal intensity of bimetallic strip 1 have been guaranteed to the degree of depth value of cutting seam 7.

As a specific embodiment of the present invention, the air is dehumidified and deoxidized, and the air is used for generating thrust after expansion; during operation, the air is dehumidified and deoxidized to reduce the air humidity in the telescopic rod, so that the degree of oxidation reaction of the telescopic rod in the working process is reduced, and the normal use of the telescopic rod is guaranteed.

As a specific embodiment of the present invention, a gap is provided between both side walls of the No. three metal sheet 5 and the No. four metal sheet 6 and the side wall of the groove, and the gap is used for reducing friction between the No. three metal sheet 5 and the No. four metal sheet 6 and the bimetallic strip 1 when they expand; during operation, contactless between its two lateral walls and the recess lateral wall when No. three sheetmetals 5 and No. four sheetmetals 6 expand for its two lateral walls can not contact with bimetallic strip 1 when No. three sheetmetals 5 and No. four sheetmetals 6 expand, thereby make the sensor can normally rotate, avoid leading to the rotation because of the friction is too big to be hindered the condition and take place.

As a specific embodiment of the present invention, the surfaces of the first metal sheet 3, the second metal sheet 4, the third metal sheet 5 and the fourth metal sheet 6 are coated with an anti-oxidation coating, and the anti-oxidation coating is used to ensure that the sensor does not generate a chemical reaction when being heated; when the sensor works, the first metal sheet 3, the second metal sheet 4, the third metal sheet 5 and the fourth metal sheet 6 cannot react with air through coating the anti-oxidation coating, so that the sensor is ensured to be used for a long time.

As a specific embodiment of the present invention, the thickness value of the third metal sheet 5 is greater than that of the fourth metal sheet 6; during operation, the thickness value of No. three sheetmetal 5 is greater than the thickness value of No. four sheetmetal 6 and makes No. three sheetmetal 5's thermal expansion degree bigger to make the deformation degree of sensor bigger, and then improved the measurement accuracy of sensor.

When the temperature sensor works, the existing bimetallic strip 1 temperature sensor can only perform single closing and separation, and cannot continuously react on the continuous change of the temperature after closing, so that the use of the bimetallic strip 1 temperature sensor has limitation, and the temperature sensor solves the problem; the third metal sheet 5 and the fourth metal sheet 6 are respectively arranged on the two sides of the bimetallic strip 1, so that the third metal sheet 5 and the fourth metal sheet 6 are heated to expand when the bimetallic strip 1 is heated; because the thermal expansion coefficient of the third metal sheet 5 is greater than that of the first metal sheet 3, and the thermal expansion coefficient of the second metal sheet 4 is greater than that of the fourth metal sheet 6, one end of the bimetallic strip 1, which is far away from the lead 2, generates a larger bending arc than that of the bimetallic strip 1, and the bimetallic strip 1 can continue to perform secondary control on a circuit after finishing single control operation; after the bimetallic strip 1 is cooled, one end of the bimetallic strip, which is far away from the lead 2, also generates a larger arc; according to the invention, the metal sheet with a larger thermal expansion coefficient is additionally arranged at the tail end of the bimetallic strip 1, so that the arc bending angle of the bimetallic strip 1 is enlarged, the control range of the bimetallic strip 1 is enlarged by the arc bending angle of the bimetallic strip 1, and the application range of the temperature sensor is further enlarged; if the length of the bimetallic strip 1 needs to be prolonged for generating larger bending arc of the bimetallic strip 1, the manufacturing cost of the sensor is increased due to the prolonged length of the bimetallic strip 1; the cutting seams 7 are arranged on the first metal sheet 3 and the second metal sheet 4, so that the extrusion deformation generated when the first metal sheet 3 and the second metal sheet 4 are bent is reduced, the first metal sheet 3 and the second metal sheet 4 are bent more easily, and the normal bending of one end of the bimetallic strip 1, which is far away from the lead 2, is ensured; meanwhile, the expansion joint 8 enables the third metal sheet 5 with a larger thermal expansion coefficient not to pop out of the groove when deforming, and ensures the bonding of the third metal sheet 5 and the first metal sheet 3, thereby ensuring the normal work of the sensor; the arrangement of the groove not only reduces the thickness of the bimetallic strip 1, thereby ensuring that the bimetallic strip 1 can be normally bent, but also reduces the manufacturing cost of the bimetallic strip 1 and further reduces the manufacturing cost of the sensor.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.