Shielded bimetal thermometer

Abstract

The invention relates to a shielding type bimetal thermometer which comprises a shell, a heat conduction mechanism, a bimetal mechanism and a metering mechanism. The shell mechanism is composed of a front shell with a heat insulation cavity and a rear shell with a heat conduction cavity. The heat conduction mechanism transmits heat to the heat conduction cavity through a heat conduction plate and a heat conduction pipe at the front end of the front shell. The tail end of the expansion sleeve is in interference fit with the heat conduction sleeve, the front end of the expansion sleeve slides, and a floating gap is formed between the expansion sleeve and the heat conduction sleeve. A first floating valve plate and a second floating valve plate of the metering part are respectively connected with the front end of the expansion sleeve and the tail end of the heat conduction sleeve, a resistance strain gauge is arranged between the valve plates, and wires are connected to a bridge; the tail end of the heat conduction rod is fixed to the second floating valve plate, and the front end of the heat conduction pipe is connected with the valve plate in a sliding mode. The thermometer accurately senses the temperature through the resistance strain gauges by using the bimetal expansion difference.

Description

Technical Field

[0001] The present invention relates to a shielded bimetallic thermometer, belonging to the field of temperature measuring devices. Background Art

[0002] A bimetallic thermometer mainly consists of a bimetallic strip, a pointer, a dial, etc. It has no complex electronic components and circuits, with a simple structure, high reliability, and is not prone to failures. While an electronic thermometer has more internal electronic components, such as sensors, amplifiers, analog-to-digital converters, etc. The complex circuit design makes the probability of its failure relatively high.

[0003] During the long-term use of the bimetallic strip in a bimetallic thermometer, as long as the temperature range and bearing limit are not exceeded, the performance is relatively stable and the change in measurement accuracy is small. The electronic components in an electronic thermometer may be affected by factors such as ambient temperature, humidity, electromagnetic interference, etc., resulting in changes in measurement accuracy, and regular calibration and maintenance are required to ensure accuracy.

[0004] However, a bimetallic thermometer cannot perform real-time data transmission and can only be observed by the naked eye.

[0005] Therefore, it is necessary to design a thermometer that combines the temperature performance of a bimetallic thermometer and can also perform data transmission. Summary of the Invention

[0006] The technical problem to be solved by the present invention is: to overcome the technical problems in the prior art and provide a shielded bimetallic thermometer.

[0007] The technical solution adopted by the present invention to solve its technical problems is: A shielded bimetallic thermometer, comprising: A housing mechanism, the housing mechanism includes a front housing and a rear housing; an adiabatic cavity is arranged inside the front housing, and a heat conduction cavity is arranged inside the rear housing; A heat conduction mechanism, the heat conduction mechanism includes a heat conduction plate arranged at the front end of the front housing and a heat conduction tube connected to the heat conduction plate, and the heat conduction tube passes through the adiabatic cavity and penetrates into the heat conduction cavity; A bimetallic mechanism, the bimetallic mechanism includes a heat conduction sleeve arranged inside the heat conduction cavity, the front end of the heat conduction sleeve is fixed to one axial end of the heat conduction cavity, the tail end of the heat conduction sleeve is slidably connected to the other axial end of the heat conduction cavity, and the heat conduction tube is thermally connected to the inside of the heat conduction sleeve through heat conductive silicone; the bimetallic mechanism further includes an expansion sleeve, the tail end of the expansion sleeve is fixed to the tail end of the heat conduction sleeve by interference fit, and the front end of the expansion sleeve is slidably connected to the front end of the heat conduction sleeve; a floating gap is arranged between the inner wall of the middle part of the expansion sleeve and the outer wall of the middle part of the heat conduction sleeve; The metering unit includes a first floating valve plate and a second floating valve plate that are slidably connected to the rear housing. The first floating valve plate is provided with a first connection hole through which the front end of the expansion sleeve is fixed. The second floating valve plate is provided with a second connection hole through which the rear end of the heat conducting sleeve is fixedly connected. The metering unit further includes a resistance strain gauge disposed between the first floating valve plate and the second floating valve plate. The wires of the resistance strain gauge penetrate the rear housing and are connected to a bridge. The metering unit further includes a compensating resistor fixed to a heat conducting rod. The rear end of the heat conducting rod is fixed to the clamping hole of the second floating valve plate through a clamping sleeve, and the front end of the heat conducting tube is slidably connected to the sliding hole of the second floating valve plate through a floating sleeve. The present invention uses an array - arranged bimetallic heat conducting sleeve and expansion sleeve structure. By using the different expansion rates of the heat conducting sleeve and the expansion sleeve, the first floating valve plate and the second floating valve plate are pushed to move relative to each other, and the temperature is sensed through the stretching of the resistance strain gauge. Resistance strain gauges are generally used for high - precision strain sensing. Using a resistance strain gauge to output temperature data will have a better linearity and smaller error than the temperature sensing of a thermistor, and the response is also more sensitive. The heat conduction form of the heat conducting silicone can ensure a certain degree of floating between the heat conducting tube and the heat conducting sleeve, reducing the influence of the thermal deformation of the heat conducting tube on the heat conducting sleeve.

[0008] As a further improvement of the present invention, a ring - shaped convex portion is provided in the middle of the expansion sleeve. A floating gap is provided within the convex portion. The length of the convex portion is 60% - 90% of the overall length of the expansion sleeve. The convex portion and the two ends of the expansion sleeve are smoothly transitioned through a gradually expanding portion. The convex portion of the expansion sleeve is fixed to the second connection hole. The convex portion expands the radial width of the floating gap, reducing the possibility that the expansion sleeve may be stuck with the heat conducting sleeve due to thermal deformation of the heat conducting sleeve.

[0009] As a further improvement of the present invention, a sliding ring is sleeved on the front end of the expansion sleeve. The sliding ring is made of steel. A ring - shaped first embedding groove that is open at one axial end of the sliding ring is provided at one axial end of the sliding ring. The front end of the expansion sleeve is embedded into the first embedding groove. The sliding ring can limit the radial thermal deformation of the end of the expansion sleeve, ensuring stable relative sliding of the end of the expansion sleeve relative to the heat conducting sleeve.

[0010] As a further improvement of the present invention, a positioning ring is sleeved on the rear end of the expansion sleeve. The positioning ring is made of steel. A ring - shaped second embedding groove that is open at one axial end of the expansion sleeve and the inner circle of the expansion is provided at one axial end of the positioning ring. The rear end of the expansion sleeve is embedded into the second embedding groove, and the expansion sleeve is pressed against the surface of the heat conducting sleeve through the positioning ring. The positioning ring can limit the radial thermal deformation of the end of the expansion sleeve, ensuring that the expansion sleeve can be stably fixed to the surface of the heat conducting sleeve.

[0011] As a further improvement of the present invention, a wiring housing is connected to the rear housing, and the wiring housing and the rear housing are separated by a partition plate; a plurality of wiring sleeves are arranged in an array on the partition plate, and the wires of the resistance strain gauges pass through the wiring sleeves and then penetrate into the wiring housing, and a wiring plug is arranged at the end of the wiring housing; The wiring housing ensures that the wires of the resistance strain gauges can be integrally coated, reducing the possibility of wire breakage.

[0012] As a further improvement of the present invention, a plurality of fixing grooves are arranged in an array on the wiring board, a tapered groove is arranged at the opening of the fixing groove, and a first heat insulation sleeve made of a silicate material is filled in the tapered groove and the fixing groove. A sliding sleeve made of polyoxymethylene is fixed in the fixing groove through the first heat insulation sleeve, and the end of the heat conducting sleeve is slidably connected into the sliding sleeve; The sliding sleeve is fixed with a heat insulation material, which can reduce the outward diffusion of the heat of the heat conducting sleeve and ensure the accuracy of temperature measurement.

[0013] As a further improvement of the present invention, a plurality of inlay seats are arranged at the front end of the front housing, an inlay groove is arranged in the inlay seat, a limiting groove is arranged at the tail end of the inlay groove, a fixing sleeve is arranged in the inlay seat, and a limiting protrusion embedded in the limiting groove is arranged at the tail end of the fixing sleeve. The front end of the fixing sleeve extends outside the front housing, and a locking nut is fixed at the front end of the fixing sleeve by a thread; the inner wall of the fixing sleeve is fixedly connected to the heat conducting sleeve through a second heat insulation sleeve made of a silicate material; Fixing with a heat insulation sleeve can reduce the heat conduction rate between the heat conducting sleeve and the housing, improve the accuracy of temperature, and the fixing form of the locking nut is convenient for the disassembly and installation of the heat conducting sleeve and the expansion sleeve.

[0014] As a further improvement of the present invention, the front housing is fixed to the front end of the rear housing through a flange; a connection frame is arranged at the front end of the front housing, a heat sink plate is arranged at one axial end of the connection frame, the outer ring of the heat sink plate is fixed to the side of the connection frame facing the inside of the front housing, a heat conducting plate is arranged at the other axial end of the connection frame, and the outer ring of the heat conducting plate is fixed to the side of the connection frame facing the outside of the front housing. The heat conducting plate and the heat sink plate are in heat conduction contact with each other, and the heat conducting tube is clamped and fixed between the heat conducting plate and the heat sink plate and is in heat conduction contact with the heat conducting plate and the heat sink plate; Using the heat sink plate and the heat conducting plate for clamping and fixing is not only convenient for disassembly, but also can ensure the sufficient heat conduction area of the heat conducting plate and the heat sink plate.

[0015] As a further improvement of the present invention, a first sealing plug is arranged on the front housing and a second sealing plug is arranged on the rear housing. An inert gas is filled in the front housing, and a heat conducting liquid is filled in the rear housing; The heat conducting liquid ensures the temperature uniformity between the heat conducting tubes.

[0016] As a further improvement of the present invention, the first floating valve plate and the second floating valve plate are slidably connected to the inner wall of the rear housing through a sliding bushing made of polytetrafluoroethylene; The sliding bushing made of polytetrafluoroethylene has good temperature resistance, stable structure, and can improve the sliding smoothness of the first floating valve plate and the second floating valve plate, thus enhancing the sensitivity of the thermometer.

[0017] The beneficial effects of the present invention are as follows: The present invention uses an array - arranged bimetallic heat - conducting sleeve and expansion sleeve structure. By utilizing the different expansion rates of the heat - conducting sleeve and the expansion sleeve, the first floating valve plate and the second floating valve plate are pushed to move relative to each other, and the temperature is sensed through the stretching of the resistance strain gauge. Resistance strain gauges are generally used in high - precision strain sensing. Using resistance strain gauges to output temperature data will have better linearity and smaller errors than temperature sensing by thermistors, and the response is also more sensitive. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the drawings and embodiments.

[0019] Figure 1 is a schematic cross - sectional view of the present invention.

[0020] In the figure: 1, rear housing; 2, first floating valve plate; 3, second floating valve plate; 4, sliding bushing; 5, heat - conducting cavity; 6, heat - conducting tube; 7, heat - conducting silica gel; 8, heat - conducting sleeve; 9, expansion sleeve; 10, floating gap; 11, sliding ring; 12, positioning ring; 13, resistance strain gauge; 14, compensating resistor; 15, heat - conducting rod; 16, clamping sleeve; 17, floating sleeve; 18, partition plate; 19, wiring sleeve; 20, wiring housing; 21, wire; 22, wiring plug; 23, fixing groove; 24, tapered groove; 25, sliding sleeve; 26, inlay seat; 27, inlay groove; 28, limiting groove; 29, fixing sleeve; 30, locking nut; 31, front housing; 32, connecting frame; 33, heat - conducting plate; 34, heat - conducting plate; 35, first sealing plug; 36, second sealing plug. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present invention will now be described in further detail with reference to the drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0022] As shown in Figure 1 , the shielded bimetallic thermometer of the present invention mainly consists of a housing mechanism, a heat - conducting mechanism, a bimetallic mechanism, and a metering part. Each part works together to achieve precise temperature measurement.

[0023] It includes: Housing mechanism The housing mechanism includes a front housing 31 and a rear housing 1. At the front end of the front housing 31, there are several inlay seats 26. At the tail end of the inlay groove 27 in the inlay seat 26, there is a limit groove 28. The limit protrusion at the tail end of the fixing sleeve 29 is embedded in the limit groove 28, and the front end extends outside the front housing 31. The fixing sleeve is tightened by screwing and fixing the locking nut 30, and it can also be easily loosened during disassembly. An adiabatic cavity is provided inside the front housing 31 and filled with inert gas to play a heat insulation role. The front end of the front housing 31 is fixed to the front end of the rear housing 1 through a flange. At one axial end of the connecting frame 32 at the front end, there is a heat sink plate 34, and the outer ring is fixed on the side of the connecting frame 32 facing the inside of the front housing 31; at the other axial end, there is a heat conduction plate 33, and the outer ring is fixed on the side of the connecting frame 32 facing the outside of the front housing 31. The heat conduction plate 33, the heat sink plate 34 are in thermal contact with the heat conduction tube 6, and the heat conduction tube 6 is clamped between the heat sink plate 34 and the heat conduction plate 33, and the heat sink plate 34 and the heat conduction plate 33 are fixed to each other by bolts.

[0024] A heat conduction cavity 5 is provided inside the rear housing 1 and filled with a heat conduction liquid to ensure uniform temperature among the heat conduction tubes 6. A wiring housing 20 is connected to the rear housing 1, and the two are separated by a partition plate 18. A number of wiring sleeves 19 are arranged in an array on the partition plate 18. A wiring plug 22 is provided at the end of the wiring housing 20. A bent compensation section is provided on the cables of the resistance strain gauge 12 and the compensation resistor 14, and the resistance strain gauge 12 and the compensation resistor 14 are connected to the wiring plug 22 through the compensation section.

[0025] To facilitate the filling and air supplement of the front housing 31 and the rear housing 1, a first sealing plug 35 is provided on the front housing 31 and a second sealing plug 36 is provided on the rear housing 1.

[0026] Heat conduction mechanism The heat conduction plate 33 of the heat conduction mechanism is arranged at the front end of the front housing 31. The heat conduction tube 6 is connected to the heat conduction plate 33, passes through the adiabatic cavity and penetrates into the heat conduction cavity 5. The front end of the heat conduction tube 6 is slidably connected to the sliding hole of the second floating valve plate 3 through a floating sleeve 17, and the heat conduction tube 6 is clamped and fixed between the heat conduction plate 33 and the heat sink plate 34, and is in thermal contact with the two to transfer the external temperature to the bimetallic mechanism.

[0027] Bimetallic mechanism The heat conduction sleeve 8 of the bimetallic mechanism is arranged in the heat conduction cavity 5, with the front end fixed at one axial end of the heat conduction cavity 5 and the tail end slidably connected to the other axial end of the heat conduction cavity 5. The heat conduction tube 6 is thermally connected to the inside of the heat conduction sleeve 8 through heat conduction silicone 7. The tail end of the expansion sleeve 9 is fixed to the tail end of the heat conduction sleeve 8 by interference fit, and the front end is slidably connected to the front end of the heat conduction sleeve 8.

[0028] An annular convex portion is provided in the middle of the expansion sleeve 9. The length of the convex portion is 80% of the overall length of the expansion sleeve 9. The convex portion of the expansion sleeve and the two end portions are smoothly transitioned through a gradually expanding portion. A floating gap 10 is provided in the convex portion, and the convex portion is fixed to the second connection hole, reducing the possibility of the expansion sleeve 9 being stuck with the heat conducting sleeve 8 due to thermal deformation of the heat conducting sleeve 8.

[0029] A steel sliding ring 11 is sleeved on the front end of the expansion sleeve 9. The first embedding groove 27 at one axial end of the sliding ring 11 is for the front end of the expansion sleeve 9 to be embedded, which can limit the radial thermal deformation of the end portion of the expansion sleeve 9 and ensure its stable sliding relative to the heat conducting sleeve 8; a steel positioning ring 12 is sleeved on the tail end. The second embedding groove 27 at one axial end of the positioning ring 12 is for the tail end of the expansion sleeve 9 to be embedded, so that the expansion sleeve 9 is pressed against the surface of the heat conducting sleeve 8 through the positioning ring 12 to ensure stable fixation.

[0030] Measurement part The first floating valve plate 2 and the second floating valve plate 3 of the measurement part are slidably connected to the inner wall of the rear housing 1 through a sliding bushing 4 made of polytetrafluoroethylene. The polytetrafluoroethylene material has good heat resistance and stable structure, which can improve the sliding smoothness and the thermometer sensitivity. The first floating valve plate 2 is penetrated with a first connection hole, and the front end of the expansion sleeve 9 is fixed here; the second floating valve plate 3 is penetrated with a second connection hole, and the tail end of the heat conducting sleeve 8 is fixedly connected here.

[0031] A resistance strain gauge 13 is provided between the first floating valve plate 2 and the second floating valve plate 3. Its wire 21 penetrates through the rear housing 1, passes through the wiring sleeve 19 and then enters the wiring housing 20 and is connected to the bridge. The measurement part also includes a compensation resistor 14, which is fixed on the heat conducting rod 15. The tail end of the heat conducting rod 15 is fixed to the clamping hole of the second floating valve plate 3 through a clamping sleeve 16.

[0032] A number of fixing grooves 23 are arranged in an array on the wiring board. The opening part of the fixing groove 23 has a tapered groove 24. The tapered groove 24 and the fixing groove 23 are filled with a first heat insulating sleeve made of silicate material. A sliding sleeve 25 made of polyoxymethylene is fixed in the fixing groove 23 through the first heat insulating sleeve. The end portion of the heat conducting sleeve 8 is slidably connected to the sliding sleeve 25, reducing the outward diffusion of the heat of the heat conducting sleeve 8 and ensuring the temperature measurement accuracy.

[0033] The working principle of the present invention is as follows: When the external temperature changes, the heat is transferred to the heat conducting tube 6 through the heat conducting plate 33, and then transferred to the heat conducting sleeve 8 through the heat conducting silica gel 7. Since the expansion rates of the heat conducting sleeve 8 and the expansion sleeve 9 are different, when the temperature changes, relative displacement occurs between the two. The expansion sleeve 9 pushes the first floating valve plate 2, and the heat conducting sleeve 8 pushes the second floating valve plate 3, causing the first floating valve plate 2 and the second floating valve plate 3 to move relatively, thereby stretching the resistance strain gauge 13. The resistance value of the resistance strain gauge 13 changes, and the signal is transmitted to the bridge through the wire 21. The bridge calculates the corresponding temperature value according to the change of the resistance value and outputs the temperature data through the wiring plug 22.

[0034] The compensation resistor 14 will not be affected by stretching as the first floating valve plate 2 and the second floating valve plate 3 move relative to each other. The compensation thermal resistance compensates for the change in the resistance blocked by the resistance strain gauge 13 due to temperature changes, ensuring the accuracy of the deformation data of the resistance strain gauge 13.

[0035] Taking the ideal embodiments of the present invention described above as an inspiration, through the above description, relevant staff can make various changes and modifications completely within the scope not deviating from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A shielded bimetallic thermometer, characterized in that, Comprising: A housing mechanism, which includes a front housing (31) and a rear housing (1); an adiabatic cavity is provided inside the front housing (31), and a heat conduction cavity (5) is provided inside the rear housing (1); A heat conduction mechanism, which includes a heat conduction plate (33) arranged at the front end of the front housing (31) and a heat conduction tube (6) connected to the heat conduction plate (33), and the heat conduction tube (6) penetrates into the heat conduction cavity (5) through the adiabatic cavity; A bimetallic mechanism, which includes a heat conduction sleeve (8) arranged inside the heat conduction cavity (5), the front end of the heat conduction sleeve (8) is fixed to one axial end of the heat conduction cavity (5), the tail end of the heat conduction sleeve (8) is slidably connected to the other axial end of the heat conduction cavity (5), and the heat conduction tube (6) is thermally connected to the inside of the heat conduction sleeve (8) through heat conduction silicone (7); the bimetallic mechanism further includes an expansion sleeve (9), the tail end of the expansion sleeve (9) is fixed to the tail end of the heat conduction sleeve (8) by interference fit, and the front end of the expansion sleeve (9) is slidably connected to the front end of the heat conduction sleeve (8); a floating gap (10) is provided between the inner wall of the middle part of the expansion sleeve (9) and the outer wall of the middle part of the heat conduction sleeve (8); A metering part, which includes a first floating valve plate (2) and a second floating valve plate (3) slidably connected inside the rear housing (1), a first connection hole is provided through the first floating valve plate (2), the front end of the expansion sleeve (9) is fixed into the first connection hole, a second connection hole is provided through the second floating valve plate (3), and the tail end of the heat conduction sleeve (8) is fixedly connected to the second connection hole; the metering part further includes a resistance strain gauge (13) arranged between the first floating valve plate (2) and the second floating valve plate (3), and the lead wire (21) of the resistance strain gauge (13) penetrates through the rear housing (1) and is connected to a bridge; The metering part further includes a compensation resistor (14), the compensation resistor (14) is fixed on a heat conduction rod (15), the tail end of the heat conduction rod (15) is fixed to the clamping hole of the second floating valve plate (3) through a clamping sleeve (16), and the front end of the heat conduction tube (6) is slidably connected to the sliding hole of the second floating valve plate (3) through a floating sleeve (17).

2. The screened bimetallic thermometer according to claim 1, wherein: A ring-shaped convex part is provided in the middle of the expansion sleeve (9), the floating gap (10) is provided inside the convex part, the length of the convex part is 60%-90% of the overall length of the expansion sleeve (9), and the convex part and the two ends of the expansion sleeve (9) are smoothly transitioned through a gradually expanding part; the convex part of the expansion sleeve (9) is fixed to the second connection hole.

3. The shielded bimetallic thermometer according to claim 1, characterized in that: in A sliding ring (11) is sleeved on the front end of the expansion sleeve (9), the sliding ring (11) is made of steel, a ring-shaped first inlay groove (27) with an opening at one axial end of the sliding ring (11) is provided at one axial end of the sliding ring (11), and the front end of the expansion sleeve (9) is embedded into the first inlay groove (27).

4. The shielded bimetal thermometer according to claim 1, characterized in that: at A positioning ring (12) is sleeved on the tail end of the expansion sleeve (9). The positioning ring (12) is made of steel. At one axial end of the positioning ring (12), there is an annular second inlay groove (27) at the axial end of the expansion sleeve (9) and the inner ring opening of the expansion. The tail end of the expansion sleeve (9) is embedded in the second inlay groove (27), and the expansion sleeve (9) is pressed against the surface of the heat-conducting sleeve (8) through the positioning ring (12).

5. The shielded bimetallic thermometer according to claim 1, characterized in that: at A wiring housing (20) is connected to the rear housing (1). The wiring housing (20) and the rear housing (1) are separated by a partition plate (18). A number of wiring sleeves (19) are arranged in an array on the partition plate (18). The wires (21) of the resistance strain gauges (13) pass through the wiring sleeves (19) and then penetrate into the wiring housing (20). A wiring plug (22) is provided at the end of the wiring housing (20).

6. The screened bimetallic thermometer according to claim 5, characterized in that: A number of fixing grooves (23) are arranged in an array on the wiring board. A tapered groove (24) is provided at the opening of the fixing groove (23). A first heat-insulating sleeve made of silicate material is filled in the tapered groove (24) and the fixing groove (23). A sliding sleeve (25) made of polyoxymethylene is fixed in the fixing groove (23) through the first heat-insulating sleeve. The end of the heat-conducting sleeve (8) is slidably connected into the sliding sleeve (25).

7. The screened bimetallic thermometer according to claim 1, characterized in that: At the front end of the front housing (31), a number of inlay seats (26) are provided. An inlay groove (27) is provided in the inlay seat (26). A limiting groove (28) is provided at the tail end of the inlay groove (27). A fixing sleeve (29) is provided in the inlay seat (26). A limiting protrusion embedded in the limiting groove (28) is provided at the tail end of the fixing sleeve (29). The front end of the fixing sleeve (29) extends to the outside of the front housing (31). A locking nut (30) is fixed to the front end of the fixing sleeve (29) by a thread. The inner wall of the fixing sleeve (29) is fixedly connected to the heat-conducting sleeve (8) through a second heat-insulating sleeve made of silicate material.

8. A shielded bimetallic thermometer according to claim 1, characterized in that: The front housing (31) is fixed to the front end of the rear housing (1) through a flange. A connecting frame (32) is provided at the front end of the front housing (31). A heat spreader (34) is provided at one axial end of the connecting frame (32). The outer ring of the heat spreader (34) is fixed to one side of the connecting frame (32) facing the inside of the front housing (31). A heat-conducting plate (33) is provided at the other axial end of the connecting frame (32). The outer ring of the heat-conducting plate (33) is fixed to one side of the connecting frame (32) facing the outside of the front housing (31). The heat-conducting plate (33) is in heat-conducting contact with the heat spreader (34). The heat-conducting tube (6) is clamped and fixed between the heat-conducting plate (33) and the heat spreader (34) and is in heat-conducting contact with the heat-conducting plate (33) and the heat spreader (34).

9. The screened bimetallic thermometer according to claim 1, characterized in that: A first sealing plug (35) is provided on the front housing (31), and a second sealing plug (36) is provided on the rear housing (1). The front housing (31) is filled with an inert gas, and the rear housing (1) is filled with a heat-conducting liquid inside.

10. A shielded bimetallic thermometer according to claim 1, characterized in that: The first floating valve plate (2) and the second floating valve plate (3) are slidably connected to the inner wall of the rear housing (1) through a sliding bushing (4) made of polytetrafluoroethylene.

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