Thermocouple with good sealing performance

Abstract

The invention relates to the technical field of thermocouples, in particular to a thermocouple with good sealing performance. According to the technical scheme, a connector is arranged at one end of the thermocouple, a measuring head is arranged at the end, away from the connector, of the thermocouple, the measuring head is installed in a container wall plate in an inserted mode, an installation hole is formed in the container wall plate in a penetrating mode, and the thermocouple is installed in the installation hole in a limited mode through a sealing piece; the sealing piece is provided with a rubber inner sleeve, the rubber inner sleeve is arranged on the outer side of the measuring head in a sleeving mode, the rubber inner sleeve is sleeved with a rubber outer sleeve, a gasket is arranged between the rubber outer sleeve and the rubber inner sleeve, and the portions, located at the two ends of the gasket, of the threaded rod are provided with a metal pressing plate and a sealing rubber plate. Through a multi-layer sealing structure, tight sealing between the thermocouple and the container wall plate is realized. The multi-layer sealing design effectively prevents medium leakage, and improves the reliability and durability of the thermocouple in a high-pressure, high-temperature or corrosive environment.

Description

Technical Field

[0001] The invention relates to the technical field of thermocouples, and in particular to a thermocouple with good sealing performance. Background Art

[0002] Thermocouples are used in industrial sites to measure the temperature of the medium in the reactor. Its main structure is a junction box, a protective sleeve, and a temperature measuring core. The lower end of the junction box is coaxially fixed with a protective sleeve, the temperature measuring core is installed in the protective sleeve and its upper end is connected to the junction box. The protective sleeve includes an upper protective sleeve and a lower protective sleeve. When the application flange is installed on the reactor, a sleeve flange needs to be installed on the outer wall of the protective sleeve and is installed with the fixed flange on the reactor through bolts. The upper end of the sleeve flange is connected to the junction box through the upper protective sleeve, and the lower end of the sleeve flange is welded to the lower protective sleeve.

[0003] After searching, the patent with the patent announcement number CN201120059590.7 discloses a fully anti-corrosion thermocouple for flange installation. Although when the device is in use, the flange diameter of the sleeve flange is connected to the junction box through the upper protective sleeve, the temperature measuring core is installed in the upper protective sleeve, the sleeve flange and the lower protective sleeve, and the upper end of the temperature measuring core is connected to the junction box, and the upper end outer wall of the lower protective sleeve is coaxially fixed with an anti-corrosion flange support, and a groove with interference fit with the anti-corrosion flange support is made on the lower surface of the sleeve flange, but when the device is in use, although the device seals the installation hole through the flange, relying solely on the flange seal is not enough to completely prevent leakage in high temperature and high pressure environments. The sealing performance of the flange connection will decrease due to long-term use and temperature changes. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a thermocouple with good sealing performance, which solves the problems raised in the background technology.

[0005] The solution of the present invention to solve the above technical problems is as follows:

[0006] A thermocouple with good sealing performance comprises a thermocouple, one end of the thermocouple is provided with a connector, the end of the thermocouple away from the connector is provided with a measuring head, and the measuring head is plugged and installed in a container wall plate;

[0007] A mounting hole is formed through the container wall plate, a sealing member is provided on the outer side of the measuring head, and the thermocouple is installed in the mounting hole by limiting the position of the sealing member;

[0008] The sealing member is provided with a rubber inner sleeve, the rubber inner sleeve is sleeved on the outside of the measuring head, the outer side of the rubber inner sleeve is sleeved with a rubber outer sleeve, a gasket is provided between the rubber outer sleeve and the rubber inner sleeve, a threaded rod is inserted through the gasket, a metal pressure plate and a sealing rubber plate are installed at both ends of the threaded rod, and the metal pressure plate and the sealing rubber plate are symmetrically distributed on both sides of the gasket, and the metal pressure plate, the sealing rubber plate and the gasket are locked at the mounting hole of the container wall panel by means of a threaded rod and a nut.

[0009] Based on the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, the number of the gaskets is set according to the depth of the mounting hole, and the gap between the rubber outer sleeve and the rubber inner sleeve is filled by the gaskets.

[0011] The beneficial effects of adopting the above further scheme are:

[0012] This design ensures that the gap between the rubber outer sleeve and the rubber inner sleeve is effectively filled, thereby further enhancing the sealing performance. The number of gaskets can be flexibly adjusted according to the actual depth of the mounting hole to adapt to different installation environments, thereby improving the adaptability and reliability of the sealing structure.

[0013] Furthermore, receiving grooves are provided on both sides of the gasket, sealants are poured into the receiving grooves, and two adjacent gaskets are connected and fixed by the sealants.

[0014] The beneficial effects of adopting the above further scheme are:

[0015] The sealant poured into the receiving groove not only enhances the connection strength between the gaskets, but also further improves the sealing performance. The sealant can fill the tiny gaps between the gaskets to prevent medium leakage. At the same time, the viscosity of the sealant can also resist the influence of external pressure and temperature changes on the sealing structure, extending the service life of the seal.

[0016] Furthermore, the metal pressure plate is provided with a third through hole and a fourth through hole, and the fourth through hole is distributed in a circular array outside the third through hole. The metal pressure plate is installed on the measuring head through the third through hole, and the metal pressure plate is installed on both sides of the gasket by cooperating with the threaded rod through the fourth through hole.

[0017] The beneficial effects of adopting the above further scheme are:

[0018] This design enables the metal pressure plate to be firmly mounted on the measuring head, and cooperates with the threaded rod through the fourth through hole to tightly fix the sealing structure on the container wall. The reasonable layout of the third through hole and the fourth through hole not only ensures the installation stability of the metal pressure plate, but also provides sufficient installation space for the threaded rod, making the entire sealing structure more compact and reliable.

[0019] Furthermore, the sealing rubber plate is provided with a second through hole and a first through hole, and the first through holes are distributed in a circular array outside the second through holes. The sealing rubber plate is installed on the measuring head through the second through hole, and the gap between the metal pressure plate and the container wall plate is filled through the measuring head. The sealing rubber plate is installed on both sides of the gasket in cooperation with the threaded rod through the first through hole.

[0020] The beneficial effects of adopting the above further scheme are:

[0021] The design of the second through hole and the first through hole on the sealing rubber plate enables the sealing rubber plate to fit tightly on the measuring head and the container wall plate, and the threaded rod cooperates with the gasket to further enhance the sealing performance. This design not only improves the installation stability of the sealing rubber plate, but also prevents medium leakage by filling the gap between the metal pressure plate and the container wall plate. In addition, the annular array distribution of the first through hole and the second through hole enables the sealing rubber plate to evenly distribute stress when subjected to pressure, thereby improving its pressure resistance and sealing performance.

[0022] Furthermore, a buffer gasket is provided on the sealing rubber plate, and a cavity is opened in the buffer gasket. When the buffer gasket contacts the container wall plate, the buffer gasket is deformed by compressing the cavity, thereby making the sealing rubber plate closely fit on the container wall plate.

[0023] The beneficial effects of adopting the above further scheme are:

[0024] The introduction of the buffer gasket provides additional buffering and protection for the contact between the sealing rubber sheet and the container wall. When the sealing rubber sheet is subjected to pressure from inside or outside the container, the buffer gasket can deform by compressing the cavity inside it, thereby absorbing and dispersing the pressure. This deformation not only helps the sealing rubber sheet to fit more closely to the container wall and improve the sealing performance, but also reduces the wear between the sealing rubber sheet and the container wall, extending the service life of the seal.

[0025] Furthermore, a limiting groove is provided on the metal pressing plate, a sealing gasket is embedded in the limiting groove of the metal pressing plate, and the metal pressing plate is tightly fitted with the sealing rubber plate through the sealing gasket.

[0026] The beneficial effects of adopting the above further scheme are:

[0027] The sealing gasket in the limit groove provides an additional sealing layer for the contact between the metal pressure plate and the sealing rubber plate. The sealing gasket is usually made of soft and durable material, which can fill the tiny gap between the metal pressure plate and the sealing rubber plate to prevent the medium from leaking. In addition, the sealing gasket can also increase the friction between the metal pressure plate and the sealing rubber plate, ensuring a close fit between them and further improving the sealing performance.

[0028] Furthermore, the rubber outer sleeve is tightly fitted to the inner surface of the mounting hole through deformation, and the gap between the gasket and the mounting hole is filled by the rubber outer sleeve.

[0029] The beneficial effects of adopting the above further scheme are:

[0030] The rubber outer sleeve's ability to deform enables it to fit tightly against the inner surface of the mounting hole, regardless of how the size or shape of the mounting hole changes. This tight fit not only helps prevent media leakage, but also improves the stability and durability of the sealing structure. At the same time, the rubber outer sleeve can fill the gap between the gasket and the mounting hole, further enhancing the sealing performance.

[0031] Furthermore, the lengths of the rubber outer sleeve and the rubber inner sleeve are adapted to the depth of the mounting hole, and the rubber inner sleeve is fixed to the measuring head by adhesive.

[0032] The beneficial effects of adopting the above further scheme are:

[0033] The length of the rubber outer sleeve and the rubber inner sleeve is adapted to the depth of the mounting hole, ensuring that the sealing structure can completely cover the mounting hole and provide sufficient sealing length. This design helps prevent the medium from leaking from the bottom or side of the mounting hole. In addition, the rubber inner sleeve is fixed to the measuring head by adhesive, ensuring a firm connection between the sealing structure and the measuring head and preventing leakage problems caused by loosening or falling off.

[0034] Furthermore, the measuring head passes through the center of the metal pressing plate, the sealing rubber plate and the gasket.

[0035] The beneficial effects of adopting the above further scheme are:

[0036] The measuring head passes through the center of the metal pressure plate, the sealing rubber plate and the gasket, ensuring that the thermocouple can accurately measure the temperature inside the container. This design not only simplifies the installation process of the thermocouple, but also improves the accuracy and reliability of the measurement. At the same time, because the measuring head is located in the center of the sealing structure, it can be subjected to uniform pressure from all directions, thereby further enhancing the sealing performance.

[0037] The present invention provides a thermocouple with good sealing performance. It has the following beneficial effects:

[0038] The multi-layer sealing structure, including rubber inner sleeve, rubber outer sleeve, gasket, sealant, sealing rubber plate and metal pressure plate, achieves a tight seal between the thermocouple and the container wall. This multi-layer sealing design effectively prevents medium leakage and improves the reliability and durability of the thermocouple in high pressure, high temperature or corrosive environments.

[0039] The deformability of the rubber outer sleeve enables it to fit tightly against the inner surface of the mounting hole, maintaining a good seal regardless of the size or shape of the mounting hole. At the same time, the number and thickness of the gaskets can be adjusted according to the depth of the mounting hole, further enhancing the flexibility and adaptability of the seal.

[0040] The metal pressure plate, sealing rubber plate and gasket are locked in the mounting hole of the container wall by threaded rods and nuts to ensure the stable installation of the thermocouple. This fixing method not only improves the anti-vibration performance of the thermocouple, but also prevents loosening or leakage caused by vibration or external force.

[0041] The introduction of the buffer gasket provides additional cushioning and protection for the contact between the sealing rubber plate and the container wall. When the sealing rubber plate is subjected to pressure, the buffer gasket deforms through the compression cavity, thereby dispersing the pressure and reducing wear, extending the service life of the seal.

[0042] Although the sealing structure of the thermocouple is relatively complex, the connection and fixing methods between the components are designed to be relatively simple and easy to operate. This makes the installation and maintenance process of the thermocouple more convenient and efficient, and reduces the difficulty and cost of operation.

[0043] In summary, this type of thermocouple with good sealing performance shows significant advantages in sealing, adaptability, fixity, buffer protection, installation and maintenance, and is suitable for temperature measurement needs in various harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The drawings described herein are used to provide further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0045] In the attached picture:

[0046] Figure 1 It is a schematic diagram of the main appearance of the present invention;

[0047] Figure 2 It is a rear view schematic diagram of the present invention;

[0048] Figure 3 It is a schematic diagram of the cross-sectional structure of the sealing member of the present invention;

[0049] Figure 4 It is a schematic diagram of the front appearance of the metal pressing plate and the sealing rubber plate of the present invention;

[0050] Figure 5 It is a schematic diagram of the rear appearance of the metal pressing plate and the sealing rubber plate of the present invention;

[0051] Figure 6 This is a schematic diagram of the front appearance of the rubber outer sleeve of the present invention;

[0052] Figure 7 It is a schematic diagram of the cross-sectional structure of the rubber outer sleeve of the present invention.

[0053] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0054] 1. Thermocouple; 101. Connector; 102. Measuring head; 2. Seal; 201. Metal pressure plate; 202. Sealing rubber plate; 203. Rubber outer sleeve; 204. Gasket; 205. Rubber inner sleeve; 206. First through hole; 207. Second through hole; 208. Third through hole; 209. Fourth through hole; 210. Buffer washer; 211. Sealing washer; 212. Limiting groove; 213. Accommodating groove; 3. Container wall panel; 301. Mounting hole; 4. Threaded rod; 5. Nut. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] See also Figures 1 to 7 As shown, the embodiments provided by the present invention are:

[0057] Embodiment 1

[0058] A thermocouple with good sealing performance comprises a thermocouple 1, a connector 101 is provided at one end of the thermocouple 1, a measuring head 102 is provided at the end of the thermocouple 1 away from the connector 101, the measuring head 102 is plugged and installed in a container wall plate 3, a mounting hole 301 is penetrated through the container wall plate 3, a sealing member 2 is sleeved on the outer side of the measuring head 102, and the thermocouple 1 is limitedly installed in the mounting hole 301 by the sealing member 2.

[0059] Embodiment 2

[0060] In order to increase the sealing between the thermocouple 1 and the container wall 3 by the seal 2, for example, Figures 1 to 7As shown, the present invention also includes: the sealing member 2 is provided with a rubber inner sleeve 205, the rubber inner sleeve 205 is sleeved on the outside of the measuring head 102, the outer side of the rubber inner sleeve 205 is sleeved with a rubber outer sleeve 203, the length of the rubber outer sleeve 203 and the rubber inner sleeve 205 is adapted to the depth of the mounting hole 301, the rubber inner sleeve 205 is fixed to the measuring head 102 by adhesive, the length of the rubber outer sleeve 203 and the rubber inner sleeve 205 is adapted to the depth of the mounting hole 301, ensuring that the sealing structure can completely cover the mounting hole 301 and provide sufficient sealing length. This design helps to prevent the medium from leaking from the bottom or side of the mounting hole 301. In addition, the rubber inner sleeve 205 is fixed to the measuring head 102 by adhesive, ensuring a firm connection between the sealing structure and the measuring head 102, preventing leakage caused by loosening or falling off, and the rubber outer sleeve 203 is tightly fitted to the inner surface of the mounting hole 301 by deformation, and the gap between the gasket 204 and the mounting hole 301 is filled by the rubber outer sleeve 203. The deformation ability of the rubber outer sleeve 203 enables it to be tightly fitted to the inner surface of the mounting hole 301, regardless of how the size or shape of the mounting hole 301 changes. This tight fit not only helps prevent medium leakage, but also improves the stability and durability of the sealing structure. At the same time, the rubber outer sleeve 203 can also fill the gap between the gasket 204 and the mounting hole 301, further enhancing the sealing performance. A gasket 204 is provided between the rubber outer sleeve 203 and the rubber inner sleeve 205. The number of gaskets 204 is set according to the depth of the mounting hole 301. The gap between the rubber outer sleeve 203 and the rubber inner sleeve 205 is filled by the gasket 204. This design ensures that the gap between the rubber outer sleeve 203 and the rubber inner sleeve 205 is effectively filled, thereby further enhancing the sealing performance. The number of gaskets 204 can be flexibly adjusted according to the actual depth of the mounting hole 301 to adapt to different installation environments, thereby improving the adaptability and reliability of the sealing structure. Receiving grooves 213 are provided on both sides of the gasket 204, and sealant is poured into the receiving grooves 213. Two adjacent gaskets 204 are connected and fixed by the sealant, and the threaded rod 4 inserted into the gasket 204 is also fixed by the sealant. The sealant poured into the receiving grooves 213 not only enhances the connection strength between the gaskets 204, but also further improves the sealing performance. The sealant can fill the tiny gaps between the gaskets 204 to prevent medium leakage.At the same time, the viscosity of the sealant can also resist the influence of external pressure and temperature changes on the sealing structure, thereby extending the service life of the seal 2. A threaded rod 4 is inserted through the gasket 204. The threaded rod 4 is located at both ends of the gasket 204 and is installed with a metal pressure plate 201 and a sealing rubber plate 202. A buffer gasket 210 is provided on the sealing rubber plate 202. A cavity is provided in the buffer gasket 210. The buffer gasket 210 is in contact with the container wall plate 3, and the buffer gasket 210 is deformed by compressing the cavity, thereby making the sealing rubber plate 202 fit tightly on the container wall plate 3. The introduction of the buffer gasket 210 provides additional buffering and protection for the contact between the sealing rubber plate 202 and the container wall plate 3. When the sealing rubber plate 202 is subjected to pressure from inside or outside the container, the buffer gasket 210 can be deformed by compressing the cavity inside it, thereby absorbing and dispersing the pressure. This deformation not only helps the sealing rubber plate 202 to fit more closely on the container wall plate 3 and improve the sealing performance, but also reduces the wear between the sealing rubber plate 202 and the container wall plate 3 and prolongs the service life of the seal 2. A limiting groove 212 is provided on the metal pressing plate 201. A sealing gasket 211 is embedded in the limiting groove 212 of the metal pressing plate 201. The metal pressing plate 201 fits tightly with the sealing rubber plate 202 through the sealing gasket 211. The sealing gasket 211 in the limiting groove 212 provides an additional sealing layer for the contact between the metal pressing plate 201 and the sealing rubber plate 202. The sealing gasket 211 is usually made of a soft and durable material, which can fill the tiny gap between the metal pressing plate 201 and the sealing rubber plate 202 to prevent leakage of the medium. In addition, the sealing gasket 211 can also increase the friction between the metal pressure plate 201 and the sealing rubber plate 202 to ensure a close fit between them and further improve the sealing performance. The metal pressure plate 201 and the sealing rubber plate 202 are symmetrically distributed on both sides of the gasket 204. A third through hole 208 and a fourth through hole 209 are provided on the metal pressure plate 201, and the fourth through hole 209 is distributed in a circular array outside the third through hole 208. The metal pressure plate 201 is mounted on the measuring head 102 through the third through hole 208, and the metal pressure plate 201 is mounted on both sides of the gasket 204 through the fourth through hole 209 in cooperation with the threaded rod 4. This design enables the metal pressure plate 201 to be firmly mounted on the measuring head 102, and to cooperate with the threaded rod 4 through the fourth through hole 209 to tightly fix the sealing structure on the container wall panel 3.The reasonable layout of the third through hole 208 and the fourth through hole 209 not only ensures the installation stability of the metal pressure plate 201, but also provides sufficient installation space for the threaded rod 4, making the entire sealing structure more compact and reliable. The sealing rubber plate 202 is provided with a second through hole 207 and a first through hole 206, and the first through hole 206 is distributed in a circular array on the outer side of the second through hole 207. The sealing rubber plate 202 is sleeved and installed on the measuring head 102 through the second through hole 207, and the gap between the metal pressure plate 201 and the container wall plate 3 is filled by the measuring head 102, and the sealing rubber plate 202 is installed on both sides of the gasket 204 through the first through hole 206 and the threaded rod 4. The design of the second through hole 207 and the first through hole 206 on the sealing rubber plate 202 enables the sealing rubber plate 202 to fit tightly on the measuring head 102 and the container wall plate 3, and at the same time, the threaded rod 4 cooperates with the gasket 204 to further enhance the sealing performance. This design not only improves the installation stability of the sealing rubber plate 202, but also prevents medium leakage by filling the gap between the metal pressing plate 201 and the container wall plate 3. In addition, the annular array distribution of the first through hole 206 and the second through hole 207 enables the sealing rubber plate 202 to evenly distribute stress when subjected to pressure, thereby improving its pressure resistance and sealing performance. The metal pressing plate 201, the sealing rubber plate 202 and the gasket 204 are locked at the mounting hole 301 of the container wall plate 3 by the threaded rod 4 and the nut 5. The measuring head 102 penetrates the center of the metal pressing plate 201, the sealing rubber plate 202 and the gasket 204, ensuring that the thermocouple 1 can accurately measure the temperature inside the container. This design not only simplifies the installation process of the thermocouple 1, but also improves the accuracy and reliability of the measurement. At the same time, since the measuring head 102 is located at the center of the sealing structure, it can be subjected to uniform pressure from all directions, thereby further enhancing the sealing performance.

[0061] Working principle:

[0062] Thermocouple 1 is a temperature sensor based on the thermoelectric effect. When two different conductors or semiconductors (the constituent materials of thermocouple 1 in this solution) form a closed loop and there is a temperature difference between the two junctions (working end and hot end), an electromotive force will be generated in the loop. This electromotive force is called thermoelectric potential. The magnitude of the thermoelectric potential is related to the material of the conductor and the temperature difference between the two junctions. By measuring this thermoelectric potential, the temperature difference between the two junctions can be determined, thereby knowing the temperature of the measured medium.

[0063] The solution adopts a multi-layer sealing structure, including components such as a rubber inner sleeve 205, a rubber outer sleeve 203, a gasket 204, a sealant, a sealing rubber plate 202, and a metal pressing plate 201. These components work together to achieve a tight seal between the thermocouple 1 and the container wall plate 3.

[0064] The rubber outer sleeve 203 has good deformation ability and can be closely attached to the inner surface of the mounting hole 301. No matter how the size or shape of the mounting hole 301 changes, the rubber outer sleeve 203 can adapt by deformation, thereby maintaining a good sealing effect.

[0065] The gasket 204 is disposed between the rubber inner sleeve 205 and the rubber outer sleeve 203, and fills the gap between the rubber outer sleeve 203 and the mounting hole 301. The number and thickness of the gasket 204 can be adjusted according to the depth of the mounting hole 301 to ensure the tightness of the seal.

[0066] The gasket 204 is disposed between the rubber inner sleeve 205 and the rubber outer sleeve 203, and fills the gap between the rubber outer sleeve 203 and the mounting hole 301. The number and thickness of the gasket 204 can be adjusted according to the depth of the mounting hole 301 to ensure the tightness of the seal.

[0067] The metal pressing plate 201 and the sealing rubber plate 202 are locked at the mounting hole 301 of the container wall plate 3 by means of the threaded rod 4 and the nut 5. The sealing rubber plate 202 has good elasticity and sealing properties and can be closely attached to the container wall plate 3. The metal pressing plate 201 provides sufficient pressing force to ensure close contact between the sealing rubber plate 202 and the container wall plate 3.

[0068] The buffer gasket 210 is arranged between the sealing rubber plate 202 and the container wall plate 3. When the sealing rubber plate 202 is subjected to pressure, the buffer gasket 210 is deformed by compressing the cavity, thereby dispersing the pressure and reducing wear, thereby protecting the sealing rubber plate 202 from damage.

[0069] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0070] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A thermocouple with good sealing performance, comprising a thermocouple (1), wherein one end of the thermocouple (1) is provided with a connector (101), and the end of the thermocouple (1) away from the connector (101) is provided with a measuring head (102), wherein the measuring head (102) is plugged and installed in a container wall plate (3), characterized in that: The container wall plate (3) is provided with a mounting hole (301), the outer side of the measuring head (102) is sleeved with a sealing member (2), and the thermocouple (1) is installed in the mounting hole (301) by limiting the position of the sealing member (2); The sealing element (2) is provided with a rubber inner sleeve (205), the rubber inner sleeve (205) is sleeved on the outside of the measuring head (102), the rubber outer sleeve (203) is sleeved on the outside of the rubber inner sleeve (205), a gasket (204) is provided between the rubber outer sleeve (203) and the rubber inner sleeve (205), a threaded rod (4) is inserted through the gasket (204), a metal pressure plate (201) and a sealing rubber plate (202) are installed at both ends of the threaded rod (4) of the gasket (204), and the metal pressure plate (201) and the sealing rubber plate (202) are symmetrically distributed on both sides of the gasket (204), and the metal pressure plate (201), the sealing rubber plate (202) and the gasket (204) are locked at the installation hole (301) of the container wall plate (3) through the threaded rod (4) and the nut (5).

2. A thermocouple with good sealing performance according to claim 1, characterized in that: The number of the gaskets (204) is set according to the depth of the mounting hole (301), and the gap between the rubber outer sleeve (203) and the rubber inner sleeve (205) is filled by the gaskets (204).

3. A thermocouple with good sealing performance according to claim 1, characterized in that: Receiving grooves (213) are provided on both sides of the gasket (204), the receiving grooves (213) are filled with sealant, and two adjacent gaskets (204) are connected and fixed by the sealant.

4. A thermocouple with good sealing performance according to claim 1, characterized in that: The metal pressure plate (201) is provided with a third through hole (208) and a fourth through hole (209), and the fourth through holes (209) are distributed in a circular array outside the third through holes (208); the metal pressure plate (201) is sleeved and installed on the measuring head (102) through the third through holes (208), and the metal pressure plate (201) is installed on both sides of the gasket (204) by cooperating with the threaded rod (4) through the fourth through holes (209).

5. A thermocouple with good sealing performance according to claim 1, characterized in that: The sealing rubber plate (202) is provided with a second through hole (207) and a first through hole (206), and the first through holes (206) are distributed in a circular array outside the second through holes (207). The sealing rubber plate (202) is sleeved and installed on the measuring head (102) through the second through holes (207), and the gap between the metal pressure plate (201) and the container wall plate (3) is filled through the measuring head (102). The sealing rubber plate (202) is installed on both sides of the gasket (204) through the first through holes (206) and in cooperation with the threaded rod (4).

6. A thermocouple with good sealing performance according to claim 1, characterized in that: A buffer gasket (210) is provided on the sealing rubber plate (202), a cavity is provided in the buffer gasket (210), and the buffer gasket (210) is in contact with the container wall plate (3) so that the buffer gasket (210) is deformed by compressing the cavity, thereby making the sealing rubber plate (202) closely fit on the container wall plate (3).

7. A thermocouple with good sealing performance according to claim 1, characterized in that: The metal pressing plate (201) is provided with a limiting groove (212), a sealing gasket (211) is embedded in the limiting groove (212) of the metal pressing plate (201), and the metal pressing plate (201) is tightly fitted with the sealing rubber plate (202) via the sealing gasket (211).

8. A thermocouple with good sealing performance according to claim 1, characterized in that: The rubber outer sleeve (203) is tightly fitted to the inner surface of the mounting hole (301) by deformation, and the gap between the gasket (204) and the mounting hole (301) is filled by the rubber outer sleeve (203).

9. A thermocouple with good sealing performance according to claim 1, characterized in that: The lengths of the rubber outer sleeve (203) and the rubber inner sleeve (205) are matched to the depth of the mounting hole (301), and the rubber inner sleeve (205) is fixed to the measuring head (102) by adhesive bonding.

10. A thermocouple with good sealing performance according to claim 1, characterized in that: The measuring head (102) passes through the center of the metal pressing plate (201), the sealing rubber plate (202) and the gasket (204).

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