JP3219123U - Thermocouple device - Google Patents

Abstract

A thermocouple device capable of suppressing concentration of stress applied to a protective tube is provided.
A thermocouple device (1) includes a thermocouple (2), a protective tube (5) that accommodates the thermocouple (2), a support metal (6) that supports the protective tube (5) from the outer surface side, and between the protective tube (5) and the support metal (6). And a bolt 9 penetrating the support fitting 6 and abutting against the joint sheet 8.
[Selection] Figure 2

Description

  The present invention relates to a thermocouple device.

  Conventionally, a protective tube that houses a thermocouple and a support fitting that supports the protective tube are fixed to each other by bolts that pass through the support fitting and come into contact with the outer surface of the protective tube.

Japanese Patent Laid-Open No. 7-260593

  In the prior art, there is a problem that stress due to thermal expansion concentrates on the portion where the bolt of the protective tube contacts.

  In Patent Document 1, a heat-resistant plastic metal ring is interposed between the outer peripheral surface of the fixing groove formed in the connecting portion of the ceramic thermocouple protection tube and the inner peripheral surface of the adapter terminal portion, and fixed with a set screw. However, since the thermal expansion of the metal ring itself is also added, it is not sufficient to suppress stress concentration.

  The present invention has been made in view of the above problems, and its main object is to provide a thermocouple device capable of suppressing concentration of stress applied to a protective tube.

  In order to solve the above problems, a thermocouple device according to one aspect of the present invention includes a thermocouple, a protective tube that accommodates the thermocouple, a support fitting that supports the protective tube from an outer surface side, and the protective tube. A joint sheet interposed between the support bracket and a bolt that penetrates the support bracket and contacts the joint sheet.

  The said aspect WHEREIN: You may further provide the adhesive sealing material interposed between the said protective tube and the said joint sheet | seat. Further, the adhesive sealing material may be a silicone sealant.

  In the above aspect, the thermocouple is accommodated, the second protection tube accommodated in the protection tube, the second protection tube is supported from the outer surface side, and the second protection tube is inserted into the support fitting and supported from the outer surface side. 2 support metal fittings may be further provided. Moreover, you may further provide the insulator accommodated in the said 2nd protective tube with the said thermocouple.

  According to the present invention, it is possible to suppress the concentration of stress applied to the protective tube.

It is a front view which shows the structural example of the thermocouple apparatus which concerns on embodiment. It is sectional drawing when cut | disconnecting by the II-II line | wire shown in FIG. It is an exploded view for demonstrating the structural example of the said thermocouple apparatus.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a front view illustrating a configuration example of a thermocouple device 1 according to the embodiment. FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG. FIG. 3 is an exploded view for explaining a configuration example of the thermocouple device 1. In the following description, the direction in which the terminal box 7 is provided in the thermocouple device 1 is “upward”, and the opposite direction is “downward”.

  The thermocouple device 1 includes a thermocouple 2 and is used for measuring, for example, the in-furnace gas temperature or exhaust gas temperature of various furnaces. The thermocouple 2 is, for example, a platinum rhodium type (R thermocouple), and is suitable for use at a relatively high temperature (for example, 1000 degrees or more). The type of the thermocouple 2 is not particularly limited, and may be, for example, an alumel chromel type (K thermocouple).

  The thermocouple device 1 has a triple protection structure in order to protect the thermocouple 2 from corrosive gas. Specifically, the thermocouple device 1 includes an insulator 27 that houses the thermocouple 2, an inner protective tube 3 (an example of a second protective tube) that houses the thermocouple 2 and the insulator 27, the thermocouple 2, An outer protective tube 5 (an example of a protective tube) that houses the insulator 27 and the inner protective tube 3 is provided.

  The insulator 27 electrically insulates the thermocouple 2. Specifically, a plurality of cylindrical insulators 27 are continuous in one direction, and the thermocouple 2 is inserted inside these insulators 27. The insulator 27 is made of a porcelain material including, for example, alumina.

  The inner protective tube 3 has a cylindrical shape with the lower end closed. The inner protective tube 3 may be formed of, for example, a porcelain material containing alumina or the like, or may be formed of a composite material (cermet) of ceramic and metal.

  The inner protective tube 3 is supported from the outer surface side by the inner support fitting 4. Specifically, the upper end portion of the inner protective tube 3 is inserted inside the cylindrical inner support fitting 4 and fixed by, for example, welding, an adhesive, or press fitting. The inner support fitting 4 is made of a metal such as stainless steel.

  The outer protective tube 5 has a cylindrical shape with the lower end closed. The outer protective tube 5 is made of ceramic such as silicon carbide (SiC).

  The outer protective tube 5 is supported from the outer surface side by the outer support fitting 6. Specifically, the upper end portion of the outer protective tube 5 is inserted inside the cylindrical outer support fitting 6 and fixed by bolts 9. The outer support fitting 6 is made of a metal such as stainless steel, for example.

  The outer support fitting 6 has a cylindrical upper part 64 and a cylindrical lower part 65 having a diameter larger than that of the upper part 64. The inner support fitting 4 that supports the inner protective tube 3 is inserted into the upper portion 64 of the outer support fitting 6 from above the upper portion 64 and supported by screwing.

  A terminal box 7 is connected to the inner support fitting 4 by screwing to the upper end of the outer support fitting 6. The terminal box 7 accommodates a terminal block 73. The terminal block 73 is connected to the thermocouple 2 drawn upward from the inner protective tube 3 and the insulator 27.

  The upper end portion of the outer protective tube 5 is inserted into the lower portion 65 of the outer support fitting 6 and is supported from the outer surface side by bolts 9. A joint sheet 8 is interposed between the outer protective tube 5 and the lower portion 65 of the outer support fitting 6. The joint sheet 8 is a sheet-like gasket obtained by blending inorganic fibers, rubber, a filler, and the like and press-rolling with a heating roll.

  Further, an adhesive seal material 89 is interposed between the outer protective tube 5 and the joint sheet 8, and the joint sheet 8 is bonded to the outer protective tube 5. The adhesive sealing material 89 is, for example, a silicone sealant. A silicone sealant is an adhesive containing a silicone polymer.

  A plurality of through holes 96 that are separated from each other in the circumferential direction are formed in the lower portion 65 of the outer support fitting 6. The plurality of bolts 9 are screwed into each of the plurality of through holes 96 and pass through the lower portion 65 of the outer support fitting 6 to contact the joint sheet 8, thereby supporting the outer protective tube 5.

  The assembly of the thermocouple device 1 will be described with reference to FIG. First, the adhesive seal material 89 is applied to one surface of the belt-shaped joint sheet 8 (first step). Next, the joint sheet 8 is rolled up so that the adhesive sealing material 89 is located on the inner peripheral side, and inserted into the inside of the lower portion 65 of the outer support fitting 6 (second step).

  Next, the upper end portion of the outer protective tube 5 is inserted into the inside of the joint sheet 8 which is inserted into the lower portion 65 of the outer support fitting 6 and is rounded into a cylindrical shape (third step). Thereafter, the bolt 9 is screwed into the through hole 96 formed in the outer support fitting 6 to fix the outer protective tube 5 (fourth step).

  Not limited to this, the joint sheet 8 is bonded to the upper end portion of the outer protective tube 5 via an adhesive seal material 89, and the upper end portion of the outer protective tube 5 to which the joint sheet 8 is bonded is connected to the outer support fitting 6. It may be inserted inside the lower part 65.

  In the embodiment described above, the outer protective tube 5 is supported by the bolt 9 passing through the outer support fitting 6 and contacting the joint sheet 8. According to this, since the stress due to the thermal expansion of the bolt 9 can be absorbed or dispersed by interposing the joint sheet 8, the bolt 9 is in direct contact with the outer protective tube 5 and the stress due to the thermal expansion is concentrated at one point. In comparison, breakage of the outer protective tube 5 can be suppressed.

  In the embodiment described above, the joint sheet 8 is bonded to the outer protective tube 5 by the adhesive sealing material 89. According to this, it is possible to suppress the outer protective tube 5 from falling off from the outer support fitting 6.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various modifications can be made by those skilled in the art.

1 thermocouple device, 2 thermocouple, 27 insulator, 3 inner protective tube (example of second protective tube), 4 inner support fitting (example of second support fitting), 5 outer protective tube (example of protective tube), 6 Outer support bracket (example of support bracket), 64 Upper part, 65 Lower part, 7 Terminal box, 73 Terminal block, 8 Joint sheet, 89 Adhesive sealant, 9 Bolt, 96 Through hole

Claims (5)

A thermocouple,
A protective tube for housing the thermocouple;
A support fitting for supporting the protective tube from the outer surface side;
A joint sheet interposed between the protective tube and the support fitting;
A bolt that penetrates the support fitting and contacts the joint sheet;
A thermocouple device. An adhesive sealing material interposed between the protective tube and the joint sheet;
The thermocouple device according to claim 1. The adhesive sealing material is a silicone sealant.
The thermocouple device according to claim 2. A second protective tube that houses the thermocouple and is housed in the protective tube;
A second support fitting that supports the second protective tube from the outer surface side and is inserted into the support fitting and supported from the outer surface side;
Further comprising
The thermocouple device according to claim 1. An insulator that is housed in the second protective tube together with the thermocouple;
The thermocouple device according to claim 4.

Images