A dual-chip temperature sensor for use in harsh environments

Abstract

The invention discloses a dual-chip temperature sensor in the field of temperature sensors for use in harsh environments, including a temperature sensing chip, a high temperature resistant wire, a terminal block and a connection housing, wherein there are two temperature sensing chips, the lower end of the high temperature resistant wire is connected to the temperature sensing chip, and the upper end is connected to the terminal block, the connection housing includes an upper housing and a lower housing, a horizontal stainless steel mounting plate is provided in the middle of the lower housing, a brass bending piece is provided at the bottom and around the terminal block, epoxy resin glue is filled in the brass bending piece, the terminal block and the brass bending piece are installed on the stainless steel mounting plate, the high temperature resistant wire body is sleeved in a four-hole insulating ceramic tube, the temperature sensing chip and the four-hole insulating ceramic tube are embedded in a built-in stainless steel tube together, the upper end of the built-in stainless steel tube is welded and connected to the stainless steel mounting plate, and thermal conductive silicone grease is filled in the built-in stainless steel tube. The invention has the advantages of stable operation, simple structure, convenient connection, reliable sealing, and good mechanical vibration resistance.

Description

Technical Field

[0001] The present invention relates to the field of temperature sensors, and in particular to a dual-chip temperature sensor used in harsh environments. Background Art

[0002] At present, various types of sensors are used more and more widely in various industries, and the environments in which sensors are used are also diverse. In heavy industry and marine environment, there is an increasing need to collect and monitor relevant temperatures. Temperature sensors generally only package one temperature sensing chip, but due to the complex and harsh use environment, if the temperature sensor is broken, subsequent replacement and maintenance will be inconvenient. In this case, a temperature sensor using dual temperature sensing chips will continue to work even if one chip is damaged and does not work, which increases the service life of the temperature sensor and brings greater convenience to users. Summary of the invention

[0003] The purpose of the present invention is to provide a dual-chip temperature sensor for use in harsh environments, which is suitable for heavy industry and marine environment and can still work stably and reliably under harsh working conditions.

[0004] The object of the present invention is achieved as follows: a dual-chip temperature sensor for use in harsh environments, including a temperature sensing chip, a high-temperature resistant wire, a wiring terminal and a connecting shell, there are two temperature sensing chips, the lower end of the high-temperature resistant wire is connected to the temperature sensing chip, and the upper end is connected to the wiring terminal, the connecting shell includes an upper shell and a lower shell, a horizontal stainless steel mounting plate is provided in the middle of the lower shell, a brass bent piece is provided at the bottom and around the wiring terminal, epoxy resin glue is filled in the brass bent piece, the wiring terminal and the brass bent piece are installed on the stainless steel mounting plate, the high-temperature resistant wire body is sleeved in a four-hole insulating ceramic tube, the temperature sensing chip and the four-hole insulating ceramic tube are embedded in the built-in stainless steel tube together, the upper end of the built-in stainless steel tube is welded to the stainless steel mounting plate, and the built-in stainless steel tube is filled with thermal conductive silicone grease.

[0005] The dual-chip temperature sensor used in harsh environments of the present invention has the advantages of stable operation, simple structure, convenient connection, reliable sealing, good resistance to mechanical vibration, etc., and can reliably ensure the effective operation of the sensor in harsh working environments.

[0006] As a further improvement of the present invention, an external stainless steel protective tube is provided outside the inner stainless steel tube, the upper end of the external stainless steel protective tube extends into the lower shell body, a hexagonal nut is fixed at the bottom of the lower shell body, a connecting bolt is fixed at the upper end of the external stainless steel protective tube, the connecting bolt is threadedly connected to the hexagonal nut, and epoxy resin glue is filled at the bottom of the lower shell body, which further improves the high temperature resistance of the sensor, extends the service life of the product, and the connection is simple and reliable.

[0007] As a further improvement of the present invention, a flange is provided in the middle of the external stainless steel protective tube, and an adjusting bolt and a mounting bolt are provided on the outer sleeve of the external stainless steel protective tube. The adjusting bolt and the mounting bolt are respectively located on the upper and lower sides of the flange, and the lower end of the adjusting bolt is threadedly connected with the upper end of the mounting bolt, thereby further improving the installation efficiency of the sensor.

[0008] As a further improvement of the present invention, a first copper gasket is provided between the flange and the mounting bolt, and a second copper gasket is provided at the bottom of the mounting surface of the mounting bolt, so as to further improve the sealing effect and high temperature and corrosion resistance of the sensor connection position.

[0009] As a further improvement of the present invention, a first groove is provided on the inner side ring of the contact position between the connecting bolt and the outer surface of the lower shell, and a silicone O-ring is provided in the first groove to further improve the sealing performance of the connecting shell in a high temperature environment.

[0010] As a further improvement of the present invention, it also includes a side sleeve, the front end of the side sleeve extends into one side of the lower shell body, a square nut is fixed in one side of the lower shell body, the front end of the side sleeve is threadedly connected to the square nut, a limiting step is provided on the inner side of the front end of the side sleeve, a conical flange, an inner conical flange, a silicone sealing ring, a brass gasket and an external hexagonal bolt are provided on the rear side of the limiting step in sequence, the front end of the external hexagonal bolt extends into the rear end of the side sleeve and is threadedly connected thereto, the external hexagonal bolt, brass gasket, silicone sealing ring, inner conical flange and an inner hole for connecting the wire tube are provided in the middle of the conical flange, so that by tightening the external hexagonal bolt, force is applied to the brass gasket to cause the silicone sealing ring to expand and deform inward, completely wrapping the internal connecting wire, thereby completing the lateral sealing of the sensor connection shell.

[0011] As a further improvement of the present invention, a shrinkage neck is provided on the outer side of the front end of the side sleeve, and an external thread matching the square nut is provided on the shrinkage neck. A second groove is provided at the rear end of the shrinkage neck, and a nitrile rubber O-ring is installed in the second groove to further improve the sealing of the sensor connection housing in a high temperature environment.

[0012] As a further improvement of the present invention, the length of the conical flange is slightly longer than that of the inner conical flange. Therefore, after the two are sleeved, the end of the conical flange 20 extends from the end surface of the inner conical flange 21, which is convenient for the installation of the silicone sealing ring 24. In the process of the silicone sealing ring 24 expanding and deforming, the end inclined surface of the conical flange 20 provides a certain guiding effect on the deformation of the silicone sealing ring 24, so as to complete the lateral sealing more smoothly.

[0013] As a further improvement of the present invention, the upper shell and the lower shell, the wiring terminals, the brass bending parts and the stainless steel mounting plate, and the stainless steel mounting plate and the lower shell are all connected by detachable parts, and the connection is convenient and reliable.

[0014] As a further improvement of the present invention, a silicone gasket is arranged between the upper shell and the lower shell to further improve the sealing performance of the sensor connecting the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a dual-chip temperature sensor applied in a harsh environment according to the present invention.

[0016] Figure 2 for Figure 1 Top view of the vehicle body (with the upper housing removed).

[0017] Figure 3 for Figure 1 (with the upper housing removed).

[0018] Among them, 1 temperature sensing chip, 2 high temperature resistant wire, 3 wiring terminal, 3A high temperature resistant wire connection point, 3B connecting wire connection point, 4 upper shell, 5 lower shell, 6 stainless steel mounting plate, 7 brass bending part, 8 four-hole insulating ceramic tube, 9 internal stainless steel tube, 10 external stainless steel protection tube, 10A flange, 11 hexagonal nut, 12 connecting bolt, 13 adjusting bolt, 14 mounting bolt, 15 first copper gasket, 16 second copper gasket, 17 silicone O-ring, 18 side sleeve, 19 square nut, 20 conical flange, 21 inner conical flange, 22 brass gasket, 23 outer hexagonal bolt, 24 silicone sealing ring, 25 nitrile rubber O-ring, 26 silicone gasket. DETAILED DESCRIPTION

[0019] like Figure 1-3 The dual-chip temperature sensor shown for use in harsh environments includes a temperature sensing chip 1, a high temperature resistant wire 2, a wiring terminal 3 and a connecting shell.

[0020] There are two temperature sensing chips 1, and correspondingly, there are two pairs of high temperature resistant wires 2 and two connection terminals 3. The lower ends of the high temperature resistant wires 2 are respectively welded to the temperature sensing chips 1, and the upper ends are connected to the connection terminals 3.

[0021] The connection housing comprises an upper housing 4 and a lower housing 5. The connection terminal 3 is installed in the connection housing. Specifically, a horizontal stainless steel mounting plate 6 is provided in the middle of the lower housing 5.

[0022] Two terminals 3 are symmetrically arranged on the bottom surface of the brass bending part 7. An opening is provided in the middle of the bottom surface for the high temperature resistant wire 2 to extend out. The upper end of the high temperature resistant wire 2 is welded and fixed to the high temperature resistant wire connection point 3A of the corresponding terminal 3 through the opening. The bottom edge of the brass bending part 7 has an upward bending edge, so that the opening position and the high temperature resistant wire connection point 3A position form a closed cavity, so as to facilitate the injection of epoxy resin glue for insulation, waterproofing and fixing. The terminal 3 and the brass bending part 7 are installed together on the stainless steel mounting plate 6.

[0023] like Figure 1 As shown, the main body of the high temperature resistant wire 2 is sheathed in a four-hole insulating ceramic tube 8 to improve the insulation performance, the temperature sensing chip 1 and the four-hole insulating ceramic tube 8 are embedded in a built-in stainless steel tube 9 to increase the protection of the temperature sensing chip 1, and the built-in stainless steel tube 9 is filled with thermal conductive silicone grease to improve the response speed of the temperature sensor. The upper end of the built-in stainless steel tube 9 is welded to the stainless steel mounting plate 6.

[0024] An external stainless steel protective tube 10 is provided on the outer sleeve of the internal stainless steel tube 9, which further improves the high temperature resistance of the sensor and prolongs the service life of the product. The upper end of the external stainless steel protective tube 10 extends into the lower shell 5, and a hexagonal nut 11 is fixed to the bottom of the lower shell 5. A connecting bolt 12 is fixed to the upper end of the external stainless steel protective tube 10, and the connecting bolt 12 is threadedly connected to the hexagonal nut 11. Epoxy resin glue is poured at the bottom of the lower shell 5 to further improve the internal insulation performance of the sensor. A first groove is provided on the inner side of the contact position between the connecting bolt 12 and the outer surface of the lower shell 5, and a silicone O-ring 17 is provided in the first groove to further improve the sealing of the connecting shell in a high temperature environment.

[0025] A flange 10A is provided in the middle of the external stainless steel protection tube 10, and an adjusting bolt 13 and a mounting bolt 14 are provided on the outer sleeve of the external stainless steel protection tube 10. The adjusting bolt 13 and the mounting bolt 14 are respectively located on the upper and lower sides of the flange 10A, and the lower end of the adjusting bolt 13 is threadedly connected with the upper end of the mounting bolt 14, further improving the installation efficiency of the sensor. A first copper gasket 15 is provided between the flange 10A and the mounting bolt 14, and a second copper gasket 16 is provided at the bottom of the mounting surface of the mounting bolt 14, further improving the sealing effect of the sensor connection position and the high temperature resistance and corrosion resistance.

[0026] The dual-chip temperature sensor used in harsh environments of this embodiment further includes a side sleeve 18. Figure 1As shown, the front end of the side sleeve 18 extends into one side of the lower shell 5. A square nut 19 is fixed inside one side of the lower shell 5, which saves installation space, is more convenient to process, and is easier to assemble. A shrink neck is provided on the outside of the front end of the side sleeve 18, and an external thread that cooperates with the square nut 19 is provided on the shrink neck, thereby realizing a threaded connection between the front end of the side sleeve 18 and the square nut 19. A second groove is provided at the rear end of the shrink neck, and a nitrile rubber O-ring 25 is installed in the second groove, further improving the sealing and waterproof performance of the sensor connection shell in a high temperature environment. A limiting step is provided on the inner side of the front end of the side sleeve 18, and a conical flange 20, an inner conical flange 21, a silicone sealing ring 24, a brass gasket 22 and an outer hexagonal bolt 23 are provided on the rear side of the limiting step in sequence. The front end of the external hexagonal bolt 23 extends into the rear end of the side sleeve 18 and is threadedly connected thereto. An inner hole for the connecting wire tube is provided between the external hexagonal bolt 23, the brass gasket 22, the silicone sealing ring 24, the inner cone flange 21, and the conical flange 20. The connecting wire passes through the inner hole and enters the connecting housing, and is connected to the connecting wire connection point 3B of the terminal 3. The length of the conical flange 20 is slightly longer than the inner cone flange 21, so that after the two are sleeved, the end of the conical flange 20 extends from the end face of the inner cone flange 21, which is convenient for the installation of the silicone sealing ring 24. By tightening the external hexagonal bolt 23, a force is applied to the brass gasket 22 to cause the silicone sealing ring 24 to expand and deform inward, completely wrapping the internal connecting wire, and completing the lateral sealing of the sensor connection housing. In the process of the internal expansion and deformation of the silicone sealing ring 24, the end bevel of the conical flange 20 provides a certain guiding effect on the deformation of the silicone sealing ring 24, so as to complete the lateral sealing more smoothly.

[0027] In this embodiment, the upper shell 4 and the lower shell 5, the connection terminals 3, the brass bending parts 7 and the stainless steel mounting plate 6, and the stainless steel mounting plate 6 and the lower shell 5 are all connected by detachable parts, and the connection is convenient and reliable. A silicone gasket 26 is arranged between the upper shell 4 and the lower shell 5 to further improve the sealing performance of the sensor connection shell.

[0028] The dual-chip temperature sensor used in harsh environments of the present invention has the advantages of stable operation, simple structure, convenient connection, reliable sealing, good resistance to mechanical vibration, etc., and can reliably ensure the effective operation of the sensor in harsh working environments.

[0029] The installation method of the dual-chip temperature sensor used in a harsh environment of this embodiment includes the following steps:

[0030] (1) Weld the temperature sensing chip 1 to the lower end of the high temperature resistant wire 2, pass the main body of the high temperature resistant wire 2 through the four-hole insulating ceramic tube 8, and then embed the temperature sensing chip 1 together with the four-hole insulating ceramic tube 8 into the built-in stainless steel tube 9.

[0031] (2) Fix the terminal block 3 together with the brass bent piece 7 and the stainless steel mounting plate 6 with screws, then weld the built-in stainless steel tube 9 to the stainless steel mounting plate 6, and then weld the upper ends of the high-temperature resistant wires 2 to the terminal blocks 3.

[0032] (3) Fix the hexagonal nut 11 to the inner cavity of the lower shell 5, fill the bottom of the lower shell 5 with epoxy resin glue, and then install the stainless steel mounting plate 6 in the lower shell 5, and the main body of the built-in stainless steel tube 9 extends from the lower shell 5.

[0033] (4) The upper end of the external stainless steel protection tube 10 is welded and fixed to the connecting bolt 12, and the adjusting bolt 13 is put on. Then the internal stainless steel tube 9 is embedded into the external stainless steel protection tube 10, and then the external stainless steel protection tube 10 is installed on the lower shell 5.

[0034] (5) Install the front end of the side sleeve 18 to one side of the lower housing 5, embed the conical flange 20, the inner conical flange 21, the silicone sealing ring 24 and the brass gasket 22 into the side sleeve 18, and screw the front end of the external hexagonal bolt into the rear end of the side sleeve 18. Pass the connecting wire through the inner holes of the external hexagonal bolt 23, the brass gasket 22, the silicone sealing ring 24, the inner conical flange 21 and the conical flange 20 and connect it to the terminal 3, then tighten the external hexagonal bolt 23. The force exerted by the external hexagonal bolt 23 on the brass gasket 22 during the screwing process causes the silicone sealing ring 24 to expand and deform inward, completely wrapping the internal connecting wire, thereby completing the sealing of the inside of the sensor.

[0035] (6) Tighten the upper shell 4 and the lower shell 5 with screws.

[0036] (7) Put the first copper gasket 15 and the mounting bolt 14 on the external stainless steel protection tube 10 from bottom to top, then connect the mounting bolt 14 with the adjusting bolt 13, and then install the second copper gasket 16 at the bottom of the mounting surface of the mounting bolt 14.

[0037] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A dual-chip temperature sensor for use in harsh environments, characterized in that: It includes a temperature sensing chip, a high temperature resistant wire, a terminal block and a connecting shell. There are two temperature sensing chips. The lower end of the high temperature resistant wire is connected to the temperature sensing chip, and the upper end is connected to the terminal block. The connecting shell includes an upper shell and a lower shell. A horizontal stainless steel mounting plate is provided in the middle of the lower shell. A brass bending piece is provided at the bottom and around the terminal block. Epoxy resin glue is filled in the brass bending piece. The terminal block and the brass bending piece are installed on the stainless steel mounting plate. The main body of the high temperature resistant wire is sleeved in a four-hole insulating ceramic tube. The temperature sensing chip and the four-hole insulating ceramic tube are embedded in the built-in stainless steel tube together. The upper end of the built-in stainless steel tube is welded to the stainless steel mounting plate, the built-in stainless steel tube is filled with thermal conductive silicone grease, the outer sleeve of the built-in stainless steel tube is provided with an external stainless steel protection tube, the upper end of the external stainless steel protection tube extends into the lower shell, the bottom of the lower shell is fixed with a hexagonal nut, the upper end of the external stainless steel protection tube is fixed with a connecting bolt, the connecting bolt is threadedly connected with the hexagonal nut, the bottom of the lower shell is filled with epoxy resin glue, the middle part of the external stainless steel protection tube is provided with a flange, the outer sleeve of the external stainless steel protection tube is provided with an adjusting bolt and a mounting bolt, the adjusting bolt and the mounting bolt The mounting bolts are respectively located at the upper and lower sides of the flange, the lower end of the adjusting bolt is threadedly connected to the upper end of the mounting bolt, a first copper gasket is provided between the flange and the mounting bolt, a second copper gasket is provided at the bottom of the mounting surface of the mounting bolt, a first groove is provided on the inner side of the contact position between the connecting bolt and the outer surface of the lower shell, a silicone O-ring is provided in the first groove, and a side sleeve is also included, the front end of the side sleeve extends into one side of the lower shell, a square nut is fixed in one side of the lower shell, the front end of the side sleeve is threadedly connected to the square nut, and a limit platform is provided on the inner side of the front end of the side sleeve The rear side of the limiting step is provided with a conical flange, an inner conical flange, a silicone sealing ring, a brass gasket and an outer hexagonal bolt in sequence, the front end of the outer hexagonal bolt extends into the rear end of the side sleeve and is threadedly connected thereto, an inner hole for connecting the wire tube is provided in the middle of the outer hexagonal bolt, the brass gasket, the silicone sealing ring, the inner conical flange and the conical flange, the length of the conical flange is slightly longer than that of the inner conical flange, a contraction neck is provided on the outer side of the front end of the side sleeve, the contraction neck is provided with an external thread matching with a square nut, a second groove is provided at the rear end of the contraction neck, and a nitrile rubber O-ring is sleeved in the second groove.

2. The dual-chip temperature sensor for use in harsh environments according to claim 1, characterized in that: The upper shell and the lower shell, the wiring terminals, the brass bending parts and the stainless steel mounting plate, and the stainless steel mounting plate and the lower shell are all connected through detachable parts.

3. The dual-chip temperature sensor for use in harsh environments according to claim 1, characterized in that: A silicone gasket is arranged between the upper shell and the lower shell.

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