Fully-sealed bimetal thermometer with heat transfer structure

Abstract

The invention relates to a fully-sealed bimetal thermometer with a heat transfer structure, an outer shell of the thermometer comprises a heat conduction shell and a display shell which are fixed, the heat conduction shell is arranged below, a thermal strain mechanism is arranged in the heat conduction shell, a display mechanism is arranged in the display shell, and in the thermal strain mechanism, the bottom of a strain tube is fixed at the bottom of the heat conduction shell; a strain opening is formed in the side wall of the middle of the strain pipe, the bottom of a coaxial torsion rod is also fixed to the bottom of the heat conduction shell, and the top of the coaxial torsion rod is connected with the top of the strain pipe through a spiral driver which comprises a pushing sleeve and a rotating sleeve and is in threaded fit with the pushing sleeve and the rotating sleeve; according to the present invention, the structure is unique, the heat transfer performance is good, the sealing performance is good, the measurement precision and the stability are improved, and the application prospect is wide.

Description

Technical Field

[0001] The invention relates to a fully sealed bimetallic thermometer with a heat transfer structure, belonging to the field of metering equipment. Background Art

[0002] The bimetallic thermometer in the prior art uses two sets of metal sheets that are intertwined and fixed to each other, and utilizes the different expansion amounts of the two sets of metal sheets to drive the metal sheets to twist to realize temperature display. However, the two sets of metal sheets will separate and slide to a certain extent due to the reciprocating heating and cooling, which will affect the accuracy of the temperature display. In addition, due to the structural characteristics of the bimetallic intertwined metal sheets, the expansion rate will be relatively limited, and the range and sensitivity will be relatively low. Summary of the invention

[0003] In order to solve the technical problem of relatively low sensitivity and measuring range of bimetallic spiral thermometers in the prior art, the present invention provides a fully sealed bimetallic thermometer with a heat transfer structure.

[0004] The technical solution adopted by the present invention to solve its technical problem is: A fully sealed bimetallic thermometer with a heat transfer structure, comprising: The outer shell includes a heat-conducting outer shell and a display outer shell which are fixed to each other in sequence; a thermal strain mechanism is arranged in the heat-conducting outer shell, and a display mechanism is arranged in the display outer shell; the heat-conducting outer shell is sealed and fixed under the display outer shell; The thermal strain mechanism comprises a strain tube, the bottom of the strain tube is fixed to the bottom of the heat-conducting shell, a heat-conducting gap is arranged between the strain tube and the inner wall of the heat-conducting shell, and a plurality of strain openings are arranged in an array on the side wall of the axial middle of the strain tube; a torsion rod is coaxially arranged in the middle of the strain tube, the bottom of the torsion rod is fixed to the bottom of the heat-conducting shell, and the top of the torsion rod is connected to the top of the strain tube through a screw driver; And, a display mechanism, the display mechanism includes a display pointer, which is divided into a display slot and a connection slot by a partition plate in the display housing, the connection slot is sealed and connected to the heat-conducting housing, the display pointer is rotatably connected to the bottom of the connection slot, the bottom of the display pointer is in sliding sealing contact with the partition plate through a seal, and the top of the torsion rod is coaxially fixed with the display pointer; The spiral driver includes a push sleeve coaxially fixed to the top of the strain tube and a rotating sleeve coaxially sleeved on the torsion rod, and the push sleeve and the rotating sleeve are matched by threads; The heat-conducting shell is filled with a heat-conducting medium; and the heat-conducting gap is filled with a heat-conducting net with a porous structure.

[0005] As a further improvement of the present invention, a deformation portion is provided in the middle of the torsion rod, and a plurality of elongated deformation grooves are provided in a ring array on the deformation portion, and the axis of the deformation groove is coaxially arranged with the torsion rod; the deformation groove reduces the torsional strength of the torsion rod and increases the torsional sensitivity of the torsion rod.

[0006] As a further improvement of the present invention, a transfer block is provided at the bottom of the heat-conducting housing, a sealing ring is provided on the top of the transfer block, the sealing ring is sealed and fixed to the bottom of the heat-conducting housing by interference fit, an annular fixing groove is provided on the sealing ring, and the bottom of the strain tube is fixed to the fixing groove by interference fit; The adapter block can facilitate the disassembly and installation of the strain tube, and also facilitate the split structure and stable coaxial fixation of the strain tube. In addition, the adapter block can ensure the fixing strength through the sealing ring while improving the thermal conductivity with the strain tube.

[0007] As a further improvement of the present invention, a heat-insulating sleeve is fixed in the middle of the adapter block, and the bottom of the torsion rod is embedded in the heat-insulating sleeve; Because the front end of the adapter block is mainly in contact with the temperature measuring medium, the thermal insulation sleeve can reduce the heating effect of the front end of the adapter block on the torsion rod, reduce the synchronous thermal deformation of the torsion rod, and improve the accuracy.

[0008] As a further improvement of the present invention, a sealing portion is provided at the bottom of the adapter block, the sealing portion includes an annular plug-in ring, a closed cover is fixed to the inner wall of the plug-in ring by interference fit, and the closed cover is filled with a heat-conducting medium; a fixing hole is provided through the fixed position of the adapter block corresponding to the heat-insulating sleeve, and the heat-insulating sleeve is interference fit into the fixing hole; The heat-conducting medium in the closed cover at the front end of the adapter block can ensure the heat-conducting efficiency of the adapter block and the closed cover relative to the temperature measuring medium by heating itself, thereby ensuring the heat-conducting efficiency of the strain gauge tube.

[0009] As a further improvement of the present invention, the front end of the closed cover is provided with a filling hole, and a sealing plug is fixed in the middle of the filling hole by interference fit; The filling holes can facilitate the full filling of the heat transfer medium and the release during maintenance, and can also facilitate the exhaust of the heat transfer medium during maintenance.

[0010] As a further improvement of the present invention, an intermediate shell is further provided between the heat-conducting shell and the display shell, the top of the intermediate shell is fixedly connected to the bottom of the display shell by a flange, the inner diameter of the intermediate shell is larger than the outer diameter of the heat-conducting shell, the spiral drive is located in the intermediate shell, a fixing ring is fixed to the bottom of the intermediate shell, an annular connecting ring is provided at the top of the fixing ring, the connecting ring is connected to the bottom of the intermediate shell by threads, an annular first limiting ring is provided at the bottom of the fixing ring, the inner diameter of the first limiting ring is smaller than the inner diameter of the intermediate shell, the inner wall of the first limiting ring is in sealing contact with the outer wall of the heat-conducting shell, a supporting ring in sliding contact with the inner wall of the intermediate shell is provided at the top of the heat-conducting shell, a first sealing ring is provided between the supporting ring and the end of the first limiting ring, and a second limiting ring for limiting the supporting ring is fixed to the inner wall of the intermediate shell; The intermediate shell can facilitate the rapid separation of the heat-conducting shell, which is convenient for manufacturing and maintenance. At the same time, compared with integral fixation or welding fixation or threaded fixation, the intermediate shell improves the strength and is not prone to fatigue.

[0011] As a further improvement of the present invention, a second sealing ring is further provided on the top inner wall of the heat-conducting housing, the second sealing ring is fixed by a support ring integrally provided on the top inner wall of the heat-conducting housing, and the second sealing ring is in sealing contact with the top outer wall of the strain tube; a third sealing ring made of sponge material is further provided between the top inner wall of the strain tube and the torsion rod; The second sealing ring and the third sealing ring can ensure the flow resistance of the heat-conducting medium at the bottom of the heat-conducting housing, and reduce the heat-conducting medium spraying into the spiral driver and the display mechanism, because the viscosity of the heat-conducting medium affects the normal operation of the spiral driver and the display mechanism.

[0012] As a further improvement of the present invention, a pressure sheet made of elastic material is fixed in the middle of the connection groove of the display housing through a main inlay ring, the inner ring of the pressure sheet is in sliding sealing contact with the torsion rod through a secondary inlay ring, and a plurality of deformed protrusions are arranged in an annular array on the pressure sheet; a pressure regulating valve is fixed on the bottom side wall of the connection groove of the display housing; The pressure regulating valve can generate a positive pressure zone at the top of the display housing to ensure that the heat-conducting medium is at a certain working pressure, ensure that the heat-conducting medium is in full contact with the inner wall of the heat-conducting housing and the strain tube, and also reduce the possibility of the heat-conducting medium spraying into the spiral drive and the display mechanism.

[0013] As a further improvement of the present invention, a connecting sleeve is integrally fixed to the bottom of the push sleeve, and the top of the strain tube is fixed to the inner wall of the connecting sleeve by interference fit; The connecting sleeve and the strain tube have an interference fit, which facilitates the material processing and separate setting of the push sleeve, and can make the push sleeve have a lower thermal strain coefficient, ensuring the accuracy of the data.

[0014] The beneficial effects of the present invention are: The present invention improves the original double-helix metal strain structure into a matching structure consisting of a tubular longitudinal expansion tube and a circumferentially twisted torsion rod, and uses threaded matching to achieve the change of expansion amount into torsion angle. Compared with the double-helix structure, the expansion tube of this structure can have a lower thickness and a larger expansion change rate, while increasing the heat conduction area, effectively improving the range and sensitivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a cross-sectional schematic diagram of the present invention; Figure 2 is a schematic diagram of a pressure plate.

[0017] In the figure: 1. heat-conducting shell; 2. strain tube; 3. strain opening; 4. adapter block; 5. sealing ring; 6. fixing groove; 7. plug-in ring; 8. closed cover; 9. sealing plug; 10. insulation sleeve; 11. torsion rod; 12. deformation groove; 13. intermediate shell; 14. fixing ring; 15. first limiting ring; 16. connecting ring; 17. supporting ring; 18. first sealing ring; 19. second limiting ring; 20. supporting ring; 21. second sealing ring; 22. third sealing ring; 23. pushing sleeve; 24. rotating sleeve; 25. connecting sleeve; 26. display shell; 27. display groove; 28. display pointer; 29. ​​rotating column; 30. sealing element; 31. main inlay ring; 32. auxiliary inlay ring; 33. clamping ring; 34. pressure plate; 35. deformation protrusion; 36. pressure regulating valve; 37. observation cover; 38. observation plate. DETAILED DESCRIPTION

[0018] like Figure 1 This embodiment relates to a fully sealed bimetallic thermometer with a heat transfer structure. The structure and connection relationship of each part, working principle and other aspects will be described in detail below.

[0019] The thermometer as a whole is mainly composed of an outer shell, a thermal strain mechanism and a display mechanism.

[0020] The outer shell includes a heat-conducting outer shell 1 and a display outer shell 26 which are fixed to each other in sequence. A thermal strain mechanism is arranged in the heat-conducting outer shell 1, a display mechanism is arranged in the display outer shell 26, and the heat-conducting outer shell 1 is sealed and fixed below the display outer shell 26. In addition, an intermediate outer shell 13 is arranged between the heat-conducting outer shell 1 and the display outer shell 26, the top of the intermediate outer shell 13 is fixedly connected to the bottom of the display outer shell 26 through a flange, and the inner diameter of the intermediate outer shell 13 is larger than the outer diameter of the heat-conducting outer shell 1.

[0021] The thermal strain mechanism includes a strain tube 2, the bottom of which is fixed to the bottom of the heat-conducting housing 1. Specifically, an adapter block 4 is provided at the bottom of the heat-conducting housing 1, and a sealing ring 5 is provided on the top of the adapter block 4. The sealing ring 5 is sealed and fixed to the bottom of the heat-conducting housing 1 by interference fit. An annular fixing groove 6 is provided on the sealing ring 5, and the bottom of the strain tube 2 is fixed to the fixing groove 6 by interference fit. A heat-conducting gap is provided between the strain tube 2 and the inner wall of the heat-conducting housing 1, and a heat-conducting net with a porous structure is filled in the heat-conducting gap, and a heat-conducting medium is also filled in the heat-conducting housing 1 to ensure good thermal conductivity. A plurality of strain openings 3 are arranged in an array on the side wall of the axial middle of the strain tube 2. A torsion bar 11 is coaxially arranged in the middle of the strain tube 2. The bottom of the torsion bar 11 is embedded in the heat-insulating sleeve 10 fixed in the middle of the adapter block 4. The heat-insulating sleeve 10 is interference-fitted into the fixing hole provided through the corresponding position of the adapter block 4. The bottom of the torsion bar 11 is fixed to the bottom of the heat-conducting housing 1. The top of the torsion bar 11 is connected to the top of the strain tube 2 through a spiral driver. It is worth mentioning that a deformation part is arranged in the middle of the torsion bar 11. A plurality of long strip-shaped deformation grooves 12 are arranged in a circular array on the deformation part. The axis of the deformation groove 12 is arranged coaxially with the torsion bar 11. The spiral driver includes a push sleeve 23 coaxially fixed to the top of the strain tube 2 and a rotating sleeve 24 coaxially sleeved on the torsion bar 11. The push sleeve 23 and the rotating sleeve 24 are threadedly matched, and a connecting sleeve 25 is integrally fixed to the bottom of the push sleeve 23. The top of the strain tube 2 is fixed to the inner wall of the connecting sleeve 25 by interference fit.

[0022] The display mechanism includes a display pointer 28, which is divided into a display slot 27 and a connection slot by a partition plate in the display housing 26, and the connection slot is sealed to the heat-conducting housing 1. The display pointer 28 is rotatably connected to the bottom of the connection slot, and is coaxially fixed to the top of the torsion bar 11 through a rotating column 29. The bottom is in sliding and sealing contact with the partition plate through a seal 30. The seal 30 includes a first sealing sheet fixed to the partition plate and a second sealing sheet fixedly connected to the bottom of the rotating column 29. The first sealing sheet and the second sealing sheet are in sliding and sealing contact with each other. A pressure sheet 34 made of elastic material is fixed in the middle of the connection slot of the display housing 26 through a main inlay ring 31, such as Figure 2 The inner and outer rings of the pressure plate 34 are supported by a clamping ring 33. The inner ring of the pressure plate 34 is in sliding sealing contact with the torsion rod 11 through a secondary embedded ring 32. A plurality of deformation protrusions 35 are arranged in an annular array on the pressure plate 34. At the same time, a pressure regulating valve 36 is fixed to the bottom side wall of the connecting groove of the display housing 26. The deformation protrusion 35 can compensate for the change in the surface area of ​​the pressure plate 34 when the pressure plate 34 is deformed under pressure.

[0023] In addition, an observation cover 37 is fixed to the top of the display housing 26 via threads, and a transparent observation plate 38 is sealed and fixed to the top of the display housing 26 via the observation cover 37 .

[0024] A fixing ring 14 is fixed at the bottom of the intermediate shell 13, and an annular connecting ring 16 is arranged at the top of the fixing ring 14. The connecting ring 16 is connected to the bottom of the intermediate shell 13 through threads, and an annular first limiting ring 15 is arranged at the bottom of the fixing ring 14. The inner diameter of the first limiting ring 15 is smaller than the inner diameter of the intermediate shell 13, and the inner wall of the first limiting ring 15 is in sealing contact with the outer wall of the heat-conducting shell 1. A supporting ring 17 in sliding contact with the inner wall of the intermediate shell 13 is arranged at the top of the heat-conducting shell 1, and a first sealing ring 18 is arranged between the supporting ring 17 and the end of the first limiting ring 15. A second limiting ring 19 for limiting the supporting ring 17 is fixed to the inner wall of the intermediate shell 13. In addition, a second sealing ring 21 is provided on the top inner wall of the heat-conducting shell 1. The second sealing ring 21 is fixed by a support ring 20 integrally provided on the top inner wall of the heat-conducting shell 1. The second sealing ring 21 is in sealing contact with the top outer wall of the strain tube 2. A third sealing ring 22 made of sponge material is provided between the top inner wall of the strain tube 2 and the torsion rod 11.

[0025] A sealing portion is provided at the bottom of the adapter block 4, and the sealing portion includes an annular plug-in ring 7. A closed cover shell 8 is fixed by interference fit on the inner wall of the plug-in ring 7. The closed cover shell 8 is filled with a heat-conducting medium. A perfusion hole is provided at the front end of the closed cover shell 8, and a sealing plug 9 is fixed by interference fit in the middle of the perfusion hole.

[0026] When the thermometer of the present invention is working, first, heat is transferred to the adapter block 4 through the heat-conducting medium in the closed cover 8 via the external heat, and then the temperature is transferred to the strain tube 2 via the adapter block 4. Simultaneously, the strain tube 2 can also transfer heat through the heat-conducting network and the heat-conducting medium on the inner side of the heat-conducting outer shell 11. The strain tube 2 expands longitudinally due to the heat. Since the strain tube 2 is connected to the torsion rod 11 through a spiral driver, the longitudinal expansion of the strain tube 2 is converted into a change in the circumferential torsion angle of the torsion rod 11 by means of the threaded cooperation between the pushing sleeve 23 and the rotating sleeve 24, thereby driving the display pointer 28 coaxially fixed thereto to rotate, and the corresponding temperature indication can be read through the transparent observation plate 38 at the observation cover 37.

[0027] The present invention improves the original double-helix metal strain structure into a matching structure of a tubular longitudinally expanded strain tube 2 and a circumferentially twisted torsion rod 11, and realizes the change of expansion amount to torsion angle by thread matching. Compared with the double-helix structure, the expansion tube of this structure can have a lower thickness and a larger expansion change rate, while increasing the heat conduction area, effectively improving the range and sensitivity of the thermometer, so that it has better performance in temperature measurement.

[0028] In summary, the fully sealed bimetallic thermometer with a heat transfer structure achieves a good temperature measurement function through the above-mentioned unique structural design and connection method, and has many advantages and high practical value.

Claims

1. A fully sealed bimetallic thermometer with a heat transfer structure, characterized in that: include: An outer shell, the outer shell comprising a heat-conducting outer shell (1) and a display outer shell (26) fixed to each other in sequence; A thermal strain mechanism is provided in the heat-conducting housing (1), and a display mechanism is provided in the display housing (26); The heat-conducting housing (1) is sealed and fixed below the display housing (26); A thermal strain mechanism, the thermal strain mechanism comprising a strain tube (2), the bottom of the strain tube (2) being fixed to the bottom of a heat-conducting outer shell (1), a heat-conducting gap being provided between the strain tube (2) and the inner wall of the heat-conducting outer shell (1), and a plurality of strain openings (3) being arranged in an array on the axial middle side wall of the strain tube (2); a torsion rod (11) being coaxially provided in the middle of the strain tube (2), the bottom of the torsion rod (11) being fixed to the bottom of the heat-conducting outer shell (1), and the top of the torsion rod (11) being connected to the top of the strain tube (2) via a screw drive; and a display mechanism, the display mechanism comprising a display pointer (28), which is divided into a display slot (27) and a connection slot by a partition plate in a display housing (26), the connection slot is sealed to the heat-conducting housing (1), the display pointer (28) is rotatably connected to the bottom of the connection slot, the bottom of the display pointer (28) is in sliding sealing contact with the partition plate via a seal (30), and the top of the torsion rod (11) is coaxially fixed to the display pointer (28); The spiral driver comprises a push sleeve (23) coaxially fixed to the top of the strain tube (2) and a rotating sleeve (24) coaxially sleeved on the torsion rod (11), and the push sleeve (23) and the rotating sleeve (24) are engaged with each other through threads; The heat-conducting outer shell (1) is filled with a heat-conducting medium; and the heat-conducting gap is filled with a heat-conducting mesh with a porous structure.

2. A fully sealed bimetallic thermometer with a heat transfer structure as claimed in claim 1, characterized in that: A deformation portion is provided in the middle of the torsion rod (11), and a plurality of elongated deformation grooves (12) are provided in a ring array on the deformation portion, wherein the axis of the deformation groove (12) is coaxially arranged with the torsion rod (11).

3. A fully sealed bimetallic thermometer with a heat transfer structure as claimed in claim 1, characterized in that: An adapter block (4) is arranged at the bottom of the heat-conducting housing (1), a sealing ring (5) is arranged at the top of the adapter block (4), the sealing ring (5) is sealed and fixed to the bottom of the heat-conducting housing (1) by interference fit, an annular fixing groove (6) is arranged on the sealing ring (5), and the bottom of the strain tube (2) is fixed in the fixing groove (6) by interference fit.

4. A fully sealed bimetallic thermometer with a heat transfer structure as claimed in claim 3, characterized in that: A heat insulation sleeve (10) is fixed in the middle of the adapter block (4), and the bottom of the torsion rod (11) is embedded in the heat insulation sleeve (10).

5. A fully sealed bimetallic thermometer with a heat transfer structure as claimed in claim 1, characterized in that: A sealing portion is provided at the bottom of the adapter block (4), the sealing portion comprising an annular plug-in ring (7), a closed cover shell (8) is fixed to the inner wall of the plug-in ring (7) by interference fit, and a heat-conducting medium is filled in the closed cover shell (8); a fixing hole is provided through the fixed position of the adapter block (4) corresponding to the heat-insulating sleeve (10), and the heat-insulating sleeve (10) is interference fit into the fixing hole.

6. A fully sealed bimetallic thermometer with a heat transfer structure as claimed in claim 5, characterized in that: The front end of the closed cover shell (8) is provided with a pouring hole, and a sealing plug (9) is fixed in the middle of the pouring hole by interference fit.

7. A fully sealed bimetallic thermometer with a heat transfer structure as claimed in claim 1, characterized in that: An intermediate housing (13) is also provided between the heat-conducting housing (1) and the display housing (26); the top of the intermediate housing (13) is fixedly connected to the bottom of the display housing (26) via a flange; the inner diameter of the intermediate housing (13) is larger than the outer diameter of the heat-conducting housing (1); the screw drive is located in the intermediate housing (13); a fixing ring (14) is fixed to the bottom of the intermediate housing (13); an annular connecting ring (16) is provided on the top of the fixing ring (14); the connecting ring (16) is connected to the bottom of the intermediate housing (13) via a thread; An annular first limiting ring (15) is provided, the inner diameter of the first limiting ring (15) is smaller than the inner diameter of the intermediate outer shell (13), the inner wall of the first limiting ring (15) is in sealing contact with the outer wall of the heat-conducting outer shell (1), a supporting ring (17) is provided at the top of the heat-conducting outer shell (1) and is in sliding contact with the inner wall of the intermediate outer shell (13), a first sealing ring (18) is provided between the supporting ring (17) and the end of the first limiting ring (15), and a second limiting ring (19) for limiting the supporting ring (17) is fixed to the inner wall of the intermediate outer shell (13).

8. A fully sealed bimetallic thermometer with a heat transfer structure as claimed in claim 7, characterized in that: A second sealing ring (21) is also provided on the top inner wall of the heat-conducting outer shell (1); the second sealing ring (21) is fixed by a support ring (20) integrally provided on the top inner wall of the heat-conducting outer shell (1); the second sealing ring (21) is in sealing contact with the top outer wall of the strain tube (2); and a third sealing ring (22) made of sponge material is also provided between the top inner wall of the strain tube (2) and the torsion rod (11).

9. A fully sealed bimetallic thermometer with a heat transfer structure as claimed in claim 1, characterized in that: A pressure plate (34) made of an elastic material is fixed in the middle of the connecting groove of the display housing (26) via a main inlay ring (31); the inner ring of the pressure plate (34) is in sliding sealing contact with the torsion rod (11) via a secondary inlay ring (32); a plurality of deformable protrusions (35) are arranged in an annular array on the pressure plate (34); and a pressure regulating valve (36) is fixed to the bottom side wall of the connecting groove of the display housing (26).

10. A fully sealed bimetallic thermometer with a heat transfer structure as claimed in claim 1, characterized in that: A connecting sleeve (25) is integrally fixed to the bottom of the pushing sleeve (23), and the top of the strain tube (2) is fixed to the inner wall of the connecting sleeve (25) by interference fit.

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