A multifunctional temperature transmitter with over-temperature protection

Abstract

The present invention discloses a multifunctional temperature transmitter with over-temperature protection, which belongs to the field of temperature transmitters and includes a protective shell, a temperature transmitter and a thermocouple. A protective cover is provided on the top of the protective shell, and a locking ring is rotatably connected to the outer wall of the protective cover. A driving gear ring is fixed on the inner side of the locking ring. A plurality of locking bolts are evenly distributed at equal angles on the top of the protective cover. The bolt body of the locking bolt is rotatably connected to the bottom of the protective cover through a bearing structure. A driven gear is fixed on the bolt cap of the locking bolt, and the driven gear is meshed with the driving gear ring. A plurality of L-shaped air ducts are provided on the outer wall of the protective shell, and the input end of the L-shaped air duct is provided with a threaded groove matching the locking bolt. The present invention has high shock resistance and is suitable for use in complex working conditions. At the same time, it has the over-temperature protection of the thermocouple, further improving its service life, having market prospects and being suitable for promotion.

Description

Technical Field

[0001] The present invention relates to the field of temperature transmitters, and more particularly to a multifunctional temperature transmitter with over-temperature protection. Background Art

[0002] Temperature transmitters use thermocouples and thermal resistors as temperature measuring elements. The output signal from the temperature measuring element is sent to the transmitter module, which converts the physical measurement signal or ordinary electrical signal into a standard electrical signal output or a device that can output it via a communication protocol. A temperature transmitter is an instrument that converts temperature variables into a transmittable standardized output signal. It is mainly used to measure and control temperature parameters in industrial processes. According to the Chinese patent website CN111307307A, a temperature transmitter with protective shock absorption function has been published. Although it solves the problem of the temperature transmitter body being subjected to severe vibration and thus damaging the internal components, it does not solve the heat dissipation problem of the temperature transmitter. If used in a high-temperature environment, the electronic components that constitute the signal transmission part cannot withstand the high temperature and are very prone to damage. To this end, we propose a multifunctional temperature transmitter with overtemperature protection to solve the above problems. Summary of the Invention

[0003] 1. Technical problems to be solved

[0004] In response to the problems existing in the prior art, the purpose of the present invention is to provide a multifunctional temperature transmitter with over-temperature protection, which has high shock resistance and is suitable for use in complex working conditions. At the same time, it has the over-temperature protection of a thermocouple, further improving its service life, has market prospects, and is suitable for promotion.

[0005] 2. Technical solution

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] A multifunctional temperature transmitter with over-temperature protection comprises a protective shell, a temperature transmitter and a thermocouple, a protective cover is provided on the top of the protective shell, a locking ring is rotatably connected to the outer wall of the protective cover, a driving gear ring is fixed on the inner side of the locking ring, a plurality of locking bolts are evenly distributed at equal angles on the top of the protective cover, the bolt body of the locking bolt is rotatably connected to the bottom of the protective cover through a bearing structure, a driven gear is fixed on the bolt cap of the locking bolt, and the driven gear is meshed with the driving gear ring, a plurality of L-shaped air passages are provided on the outer wall of the protective shell, a threaded groove matching the locking bolt is provided at the input end of the L-shaped air passage, an air pressure chamber connected to the L-shaped air passage is provided at the inner bottom of the protective shell, a sliding rod is provided in the sliding connection of the air pressure chamber, and the temperature The temperature transmitter is fixed on the top of the sliding rod, and a first tensioning spring is clamped between the temperature transmitter and the protective cover. An insulation sleeve is fixed on the outer bottom of the protective shell, and a shock-absorbing spring is fixed inside the insulation sleeve. The thermocouple is fixed in the shock-absorbing spring. A connecting piece is fixed on the bottom of the insulation sleeve, and an outer sleeve is fixed on the bottom of the connecting piece. An inner sleeve is slidingly sleeved on the inner side of the bottom of the outer sleeve, and a second tensioning spring is clamped between the inner sleeve and the outer sleeve. An electromagnet is fixed on the bottom of the outer sleeve, and an adjusting magnet corresponding to the electromagnet is provided on the top of the inner sleeve. An annular partition is provided on the inner wall of the inner sleeve, and a stepped groove matching the annular partition is provided on the bottom end of the thermocouple. Insulation particles are filled between the thermocouple and the inner sleeve. The present invention cooperates with the protective cover with the locking ring, the driving gear ring, the locking bolt and the protective shell with the L-shaped air duct, the air pressure chamber and the sliding rod. In use, by rotating the locking ring, the meshing action of the driving gear ring and the driven gear is utilized to drive multiple locking bolts to be synchronously screwed into the L-shaped air duct, thereby completing the rapid installation of the protective cover. During the screwing process of the locking bolt, the gas in the L-shaped air duct is squeezed into the air pressure chamber, thereby lifting the sliding rod and the temperature transmitter at its top. Combined with the elastic force of the first tensioning spring, it can effectively provide flexible support for the temperature transmitter, achieve better anti-vibration and energy absorption effect, effectively improve the protection of the temperature transmitter body, and when the electromagnet adjusts the magnet Under the repulsive effect of the second tensioning spring, the inner sheath overcomes the elastic force of the second tensioning spring and rises, so that the stepped groove and the annular partition are sealed. When the temperature environment of the thermocouple is greater than the design critical value, the thermocouple feeds back the temperature information to the circuit controlling the electromagnet, and the electromagnet is closed. At this time, the inner sheath moves downward under the elastic force of the second tensioning spring, so that the stepped groove and the annular partition are opened, and the filled thermal insulation particles fall to the end of the thermocouple, achieving the effect of thermal insulation and heat absorption, thereby effectively improving the over-temperature protection of the thermocouple. The present invention can have high shock resistance and is suitable for use in complex working conditions. At the same time, it has the over-temperature protection of the thermocouple, further improving its service life, has market prospects, and is suitable for promotion.

[0008] Furthermore, the thermal insulation particles include a particle skeleton, which is a spherical porous frame structure. An iron core is fixed in the particle skeleton, and the first thermal insulation particles and the second thermal insulation particles are fixed and embedded in the holes of the particle skeleton at intervals.

[0009] Furthermore, the particle skeleton is a lightweight nylon thermal insulation integrated injection molding structure, the first thermal insulation particles are a ceramic particle structure, the second thermal insulation particles are a slag wool structure, and the adsorption force of the electromagnet on the iron core is greater than the overall gravity of the thermal insulation particles. Through the structural design with the particle skeleton, the first thermal insulation particles, the second thermal insulation particles and the iron core, the first thermal insulation particles and the second thermal insulation particles have high thermal insulation and high heat absorption properties respectively, which can effectively and quickly reduce the temperature of the thermocouple. At the same time, in conjunction with the structural design of the iron core and the annular partition with a bevel structure, when the over-temperature protection function is completed, the electromagnet starts. During the startup process, the adsorption force of the electromagnet on the iron core causes the particle skeleton to move up along the bevel structure to the top of the annular partition until the stepped bevel is sealed with the annular partition, which can realize the function of recycling, is maintenance-free, and improves the convenience of use.

[0010] Furthermore, a sloped opening structure is provided at the bottom of the annular partition.

[0011] Furthermore, a first sealing gasket is provided at the input end of the L-shaped airway, and a second sealing gasket is provided at the input end of the air pressure chamber. The edges of the first and second sealing gaskets are respectively bonded to the inner walls of the L-shaped airway and the air pressure chamber via elastic sealing diaphragms. The design of the first and second sealing gaskets effectively improves the airtightness of the L-shaped airway.

[0012] Furthermore, the top of the protective cover is provided with an air injection hole connected to the inner wall of the protective shell. A one-way valve is provided on the air injection hole, and the air injection valve is provided with carbon dioxide. The injection of carbon dioxide effectively provides a heat-insulating gas environment for the temperature transmitter, further enhancing its protective performance.

[0013] Furthermore, a wiring hole for the output connection of the temperature transmitter is provided on one side of the protective shell, and a through hole is provided on the bottom of the protective shell and the slide rod to facilitate the connection of the thermocouple and the temperature transmitter, and the through hole is filled with sealant.

[0014] Furthermore, the first tensioning spring has an elastic force that drives the temperature transmitter away from the protective cover, the second tensioning spring has an elastic force that drives the inner sheath away from the outer sheath, the shock-absorbing spring is a conical spring structure, the electromagnet is a variable magnetic pole electromagnet structure, and the repulsive force of the electromagnet on the electromagnet is greater than the elastic force of the second tensioning spring.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] (1) The present invention cooperates with the protective cover with a locking ring, a driving gear ring, and a locking bolt, and the protective shell with an L-shaped air duct, an air pressure chamber, and a sliding rod. During use, by rotating the locking ring and utilizing the meshing action of the driving gear ring and the driven gear, multiple locking bolts are driven to be synchronously screwed into the L-shaped air duct, thereby completing the rapid installation of the protective cover. During the screwing process of the locking bolt, the gas in the L-shaped air duct is squeezed into the air pressure chamber, thereby lifting the sliding rod and the temperature transmitter at its top. Combined with the elastic force of the first tensioning spring, it can effectively provide flexible support for the temperature transmitter, achieve better anti-vibration and energy absorption effect, and effectively improve the protection of the temperature transmitter body. Under the repulsive effect of iron, the inner sheath overcomes the elastic force of the second tensioning spring and rises, so that the stepped groove and the annular partition are sealed. When the temperature environment of the thermocouple is greater than the design critical value, the thermocouple feeds back the temperature information to the circuit controlling the electromagnet, and the electromagnet is closed. At this time, the inner sheath moves downward under the elastic force of the second tensioning spring, so that the stepped groove and the annular partition are opened, and the filled thermal insulation particles fall to the end of the thermocouple, achieving the effect of thermal insulation and heat absorption, thereby effectively improving the over-temperature protection of the thermocouple. The present invention can have high shock resistance and is suitable for use in complex working conditions. At the same time, it has the over-temperature protection of the thermocouple, further improving its service life, has market prospects, and is suitable for promotion.

[0018] (2) Through the structural design with a particle skeleton, first thermal insulation particles, second thermal insulation particles and an iron core, the first thermal insulation particles and the second thermal insulation particles have high thermal insulation and high heat absorption properties respectively, which can effectively and quickly reduce the temperature of the thermocouple. At the same time, with the structural design of the iron core and the annular partition with a bevel structure, when the over-temperature protection function is completed, the electromagnet starts. During the startup process, the adsorption force of the electromagnet on the iron core causes the particle skeleton to move up along the bevel structure to the top of the annular partition until the stepped bevel and the annular partition are sealed, which can realize the function of recycling, avoid maintenance, and improve the convenience of use.

[0019] (3) The airtightness of the L-shaped airway is effectively improved through the design of the first sealing gasket and the second sealing gasket.

[0020] (4) By injecting carbon dioxide gas, an insulating gas environment can be effectively provided for the temperature transmitter, further improving the protection performance of the temperature transmitter. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the front structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the bottom structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention;

[0024] Figure 4 for Figure 3 A schematic diagram of the enlarged structure of the middle part A;

[0025] Figure 5 for Figure 3 A schematic diagram of the enlarged structure of the middle part B;

[0026] Figure 6 It is a structural schematic diagram of the temperature transmitter and related components proposed in the present invention;

[0027] Figure 7 Schematic diagram of the structure of the thermocouple and related components proposed in the present invention;

[0028] Figure 8 This is a schematic structural diagram of the thermal insulation particles proposed in the present invention.

[0029] Description of the numbers in the figure:

[0030] Protective shell 1, wiring hole 11, L-shaped air duct 12, first sealing gasket 121, air pressure chamber 13, second sealing gasket 131, sliding rod 132, protective cover 2, locking ring 21, driving gear ring 211, air injection hole 22, air injection valve 221, locking bolt 23, driven gear 231, first tensioning spring 24, connecting part 3, outer sheath 4, electromagnet 41, inner sheath 5, annular partition 51, adjusting magnet 52, second tensioning spring 53, thermal insulation sleeve 6, shock-absorbing spring 7, temperature transmitter 8, thermocouple 9, stepped groove 91, particle skeleton 101, first thermal insulation particles 102, second thermal insulation particles 103, iron core 104. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention in specific circumstances.

[0034] Example 1:

[0035] See also Figure 1-8A multifunctional temperature transmitter with overtemperature protection includes a protective housing 1, a temperature transmitter 8, and a thermocouple 9. A protective cover 2 is provided on the top of the protective housing 1. A locking ring 21 is rotatably connected to the outer wall of the protective cover 2. A driving gear ring 211 is fixed to the inner side of the locking ring 21. A plurality of locking bolts 23 are evenly spaced at equal angles on the top of the protective cover 2. The bolt body of the locking bolt 23 is rotatably connected to the bottom of the protective cover 2 through a bearing structure. A driven gear 231 is fixed to the bolt cap of the locking bolt 23. The driven gear 231 is meshed with the driving gear ring 211. The outer wall of the protective shell 1 is provided with a plurality of L-shaped air ducts 12. The input end of the L-shaped air duct 12 is provided with a threaded groove matching the locking bolt 23. The inner bottom of the protective shell 1 is provided with an air pressure chamber 13 connected to the L-shaped air duct 12. A sliding rod 132 is provided in the air pressure chamber 13 for sliding connection. The temperature transmitter 8 is fixed on the top of the sliding rod 132. A first tensioning spring 24 is provided between the temperature transmitter 8 and the protective cover 2. The outer bottom of the protective shell 1 is fixed with an air pressure chamber 13 connected to the L-shaped air duct 12. Thermocouple 9 is fixed in the shock-absorbing spring 7, and the bottom of the insulation sleeve 6 is fixed with a connector 3, and the bottom of the connector 3 is fixed with an outer sleeve 4. The inner side of the bottom of the outer sleeve 4 is provided with an inner sleeve 5, and a second tensioning spring 53 is provided between the inner sleeve 5 and the outer sleeve 4. The bottom of the outer sleeve 4 is fixed with an electromagnet 41, and the top of the inner sleeve 5 is provided with an adjusting magnet 52 corresponding to the electromagnet 41. The inner wall of the inner sleeve 5 is provided with an annular partition 5. 1. The bottom end of the thermocouple 9 is provided with a stepped groove 91 that matches the annular partition 51. Insulation particles are filled between the thermocouple 9 and the inner sheath 5. The first tensioning spring 24 has an elastic force that drives the temperature transmitter 8 away from the protective cover 2. The second tensioning spring 53 has an elastic force that drives the inner sheath 5 away from the outer sheath 4. The shock-absorbing spring 7 is a conical spring structure. The electromagnet 41 is a variable magnetic pole electromagnet structure. The repulsive force of the electromagnet 41 on the electromagnet 41 is greater than the elastic force of the second tensioning spring 53.The present invention cooperates with the protective cover 2 with the locking ring 21, the driving gear ring 211, and the locking bolt 23, and the protective shell 1 with the L-shaped air duct 12, the air pressure chamber 13, and the sliding rod 132. During use, by rotating the locking ring 21, the driving gear ring 211 and the driven gear 231 are engaged, and the multiple locking bolts 23 are driven to synchronously screw into the L-shaped air duct 12, thereby completing the rapid installation of the protective cover 2. During the screwing process of the locking bolt 23, the gas in the L-shaped air duct 12 is squeezed into the air pressure chamber 13, thereby lifting the sliding rod 132 and the temperature transmitter 8 on its top. Combined with the elastic force of the first tensioning spring 24, it can effectively provide flexible support for the temperature transmitter 8, achieve better anti-vibration and energy absorption effect, and effectively improve the protection of the temperature transmitter 8 body. Under the repulsive effect of the electromagnet 41 on the adjusting magnet 52, the inner sheath 5 overcomes the elastic force of the second tensioning spring 53 and rises, so that the stepped groove 91 and the annular partition 51 are sealed. When the temperature environment of the thermocouple 9 is greater than the design critical value, the thermocouple 9 feeds back the temperature information to the circuit controlling the electromagnet 41, and the electromagnet 41 is closed. At this time, the inner sheath 5 moves downward under the elastic force of the second tensioning spring 53, so that the stepped groove 91 and the annular partition 51 are opened, and the filled thermal insulation particles fall to the end of the thermocouple 9, achieving the effect of thermal insulation and heat absorption, thereby effectively improving the over-temperature protection of the thermocouple 9. The present invention can have high shock resistance and is suitable for use in complex working conditions. At the same time, it has the over-temperature protection of the thermocouple 9, further improving its service life, has market prospects, and is suitable for promotion.

[0036] See also Figure 8 The thermal insulation particles include a particle skeleton 101, which is a spherical porous frame structure. An iron core 104 is fixed in the particle skeleton 101. The first thermal insulation particles 102 and the second thermal insulation particles 103 are fixed at intervals in the holes of the particle skeleton 101. The particle skeleton 101 is a lightweight nylon thermal insulation integrated injection molding structure. The first thermal insulation particles 102 are ceramic particle structures, and the second thermal insulation particles 103 are slag wool structures. The adsorption force of the electromagnet 41 on the iron core 104 is greater than the overall gravity of the thermal insulation particles. The bottom of the annular partition 51 is provided with a slope structure. Through the structural design with a particle skeleton 101, first thermal insulation particles 102, second thermal insulation particles 103 and an iron core 104, the first thermal insulation particles 102 and the second thermal insulation particles 103 have high thermal insulation and high heat absorption properties respectively, which can effectively and quickly reduce the temperature of the thermocouple 9. At the same time, combined with the structural design of the iron core 104 and the annular partition 51 with a bevel structure, when the over-temperature protection function is completed, the electromagnet 41 starts. During the startup process, the adsorption force of the electromagnet 41 on the iron core 104 causes the particle skeleton 101 to move up along the bevel structure to the top of the annular partition 51 until the stepped bevel 91 is sealed with the annular partition 51, which can realize the function of recycling, avoid maintenance, and improve the convenience of use.

[0037] See also Figure 3-5 The input end of the L-shaped air channel 12 is equipped with a first sealing gasket 121, and the input end of the air pressure chamber 13 is equipped with a second sealing gasket 131. The sides of the first sealing gasket 121 and the second sealing gasket 131 are respectively bonded to the inner wall of the L-shaped air channel 12 and the inner wall of the air pressure chamber 13 via elastic sealing diaphragms. The design of the first sealing gasket 121 and the second sealing gasket 131 effectively improves the airtightness of the L-shaped air channel 12.

[0038] See also Figure 3 and Figure 6 The top of the protective cover 2 is provided with an air injection hole 22 that communicates with the inner wall of the protective shell 1. The air injection hole 22 is provided with an air injection valve 221. The air injection valve 221 is a one-way valve structure. The air injected into the air injection hole 22 is carbon dioxide gas. The injection of carbon dioxide gas effectively provides a heat-insulating gas environment for the temperature transmitter 8, further improving the protection performance of the temperature transmitter 8.

[0039] See also Figure 3 One side of the protective shell 1 is provided with a wiring hole 11 for the output connection of the temperature transmitter 8, and the bottom of the protective shell 1 and the slide rod 132 are provided with a through hole for connecting the thermocouple 9 and the temperature transmitter 8, and the through hole is filled with sealant.

[0040] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A multifunctional temperature transmitter with over-temperature protection, comprising a protective housing (1), a temperature transmitter (8) and a thermocouple (9), characterized in that: The top of the protective shell (1) is provided with a protective cover (2), the outer wall of the protective cover (2) is rotatably connected to a locking ring (21), the inner side of the locking ring (21) is fixed with a driving gear ring (211), the top of the protective cover (2) is evenly distributed with a plurality of locking bolts (23), the bolt body of the locking bolt (23) is rotatably connected to the bottom of the protective cover (2) through a bearing structure, the bolt cap of the locking bolt (23) is fixed with a driven gear (231), and the driven gear The wheel (231) is meshed with the driving gear ring (211), the outer wall of the protective shell (1) is provided with a plurality of L-shaped air channels (12), the input end of the L-shaped air channel (12) is provided with a threaded groove matching the locking bolt (23), the inner bottom of the protective shell (1) is provided with an air pressure chamber (13) connected to the L-shaped air channel (12), the air pressure chamber (13) is provided with a sliding rod (132) in a sliding connection, the temperature transmitter (8) is fixed on the top of the sliding rod (132), and the temperature transmitter (8) is fixed on the top of the sliding rod (132). A first tensioning spring (24) is clamped between the transmitter (8) and the protective cover (2); a thermal insulation sleeve (6) is fixed to the outer bottom of the protective shell (1); a shock-absorbing spring (7) is fixed inside the thermal insulation sleeve (6); the thermocouple (9) is fixed inside the shock-absorbing spring (7); a connector (3) is fixed to the bottom of the thermal insulation sleeve (6); an outer sheath (4) is fixed to the bottom of the connector (3); an inner sheath (5) is slidably sleeved on the inner side of the bottom of the outer sheath (4); the inner sheath ( 5) is clamped with a second tensioning spring (53) between the outer sheath (4), an electromagnet (41) is fixed to the bottom of the outer sheath (4), an adjusting magnet (52) corresponding to the electromagnet (41) is provided on the top of the inner sheath (5), an annular partition (51) is provided on the inner wall of the inner sheath (5), a stepped groove (91) matching the annular partition (51) is provided at the bottom end of the thermocouple (9), and thermal insulation particles are filled between the thermocouple (9) and the inner sheath (5); The input end of the L-shaped air channel (12) is provided with a first sealing gasket (121), and the input end of the air pressure chamber (13) is provided with a second sealing gasket (131), and the sides of the first sealing gasket (121) and the second sealing gasket (131) are respectively bonded to the inner wall of the L-shaped air channel (12) and the inner wall of the air pressure chamber (13) through elastic sealing diaphragms; The top of the protective cover (2) is provided with an air injection hole (22) that is in communication with the inner wall of the protective shell (1); an air injection valve (221) is provided on the air injection hole (22); the air injection valve (221) is a one-way valve structure; and the gas injected into the air injection hole (22) is carbon dioxide gas; The first tensioning spring (24) has an elastic force for driving the temperature transmitter (8) away from the protective cover (2), the second tensioning spring (53) has an elastic force for driving the inner sheath (5) away from the outer sheath (4), the shock-absorbing spring (7) is a conical spring structure, the electromagnet (41) is a variable magnetic pole electromagnet structure, and the repulsive force of the electromagnet (41) on the electromagnet (41) is greater than the elastic force of the second tensioning spring (53).

2. The multifunctional temperature transmitter with over-temperature protection according to claim 1, characterized in that: The thermal insulation particles include a particle skeleton (101), the particle skeleton (101) is a spherical porous frame structure, an iron core (104) is fixed in the particle skeleton (101), and first thermal insulation particles (102) and second thermal insulation particles (103) are fixed and embedded in the holes of the particle skeleton (101) at intervals.

3. The multifunctional temperature transmitter with over-temperature protection according to claim 2, characterized in that: The particle skeleton (101) is a lightweight nylon thermal insulation integrated injection molding structure, the first thermal insulation particles (102) are a ceramic particle structure, the second thermal insulation particles (103) are a slag wool structure, and the adsorption force of the electromagnet (41) on the iron core (104) is greater than the overall gravity of the thermal insulation particles.

4. The multifunctional temperature transmitter with over-temperature protection according to claim 1, characterized in that: The bottom of the annular partition (51) is provided with a sloped opening structure.

5. The multifunctional temperature transmitter with over-temperature protection according to claim 1, characterized in that: A wiring hole (11) for connecting the output of the temperature transmitter (8) is provided on one side of the protective shell (1), and a through hole for connecting the thermocouple (9) and the temperature transmitter (8) is provided on the bottom of the protective shell (1) and the slide rod (132), and the through hole is filled with sealant.

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