JPS6233534B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a temperature measuring device for adiabatic piping.

Temperature measurement devices for internally insulated piping, in which a heat insulating material is pasted to the inner periphery of a pressure-resistant pipe, a liner pipe is inserted into the inner periphery of the heat insulating material, and high-temperature gas flows through the liner pipe, have conventionally been used as shown in Fig. 1, partial longitudinal section. As shown in the partial vertical cross-sectional view of FIG. 2 and FIG. 3 is welded to the pressure tube 5, but in the structure shown in FIG. , high-temperature gas flows in and a short pass (gas convection) occurs in the insulation material 1, causing hot spots (local heating) in the pressure tube 5.
liner tube 2 to prevent hot spots.
Although the well 6 is welded to the well 6, it is possible to prevent the occurrence of hot spots due to high-temperature gas leakage, but it is difficult to accurately measure the gas temperature using the well.

The present invention was proposed in view of the above circumstances, and aims to prevent damage and facilitate repair and maintenance despite relative displacement in the axial direction between the pressure tube and the liner tube. The purpose is to provide a temperature measuring device for insulated piping that prevents high-temperature gas from flowing into the insulation material and accurately measures the gas temperature. a well whose base is hermetically fixed to the opening in the inserted liner pipe wall and whose tip protrudes into the liner pipe; and a protective tube which is hermetically fixed to the pressure-resistant pipe and extends through the heat insulating material. and a temperature sensing element which is inserted into the protective tube via a heat insulating material and whose tip is inserted into the tip of the well,
It is characterized in that the tip of the protection tube is inserted into the outer end opening of the well with a slight clearance in the radial direction.

An embodiment of the present invention will be explained with reference to the drawings.
FIG. 3 is a longitudinal sectional view thereof.

In the above figure, the same reference numerals as those in FIGS. 1 and 2 indicate the same members as those in FIGS.
8 is a heat insulating material filled in the space between the protective tube 7 and the thermocouple 4; 9 is a well whose base penetrates the liner tube 2 in an airtight manner and extends inside the liner tube 2; The tip of 4 extends to the tip of well 9.

According to such a device, the following effects can be achieved.

(1) Since the well is welded to the liner pipe,
Internal fluid will not leak and hot spots will not occur in the pressure tube.

(2) Since the thermoelectric body is fitted into the tip of the well, accurate gas temperature measurement is possible.

(3) Since a heat insulating material is filled between the protective tube and the thermocouple, hot spots will not occur due to gas leaking through the gap.

(4) Relative displacement between the pressure tube and the liner tube due to thermal expansion can be absorbed by providing a gap between the well and the protective tube.

In short, according to the present invention, the base is airtightly fixed to the opening in the liner pipe wall that is inserted inside the heat insulating material adhered to the inner wall of the pressure pipe, and the tip protrudes into the liner pipe. a well, a protective tube that is airtightly fixed to the pressure tube and extends through a heat insulating material, and a temperature sensing element that is inserted into the protective tube through the heat insulating material and whose tip is inserted into the tip of the well. In this case, the tip of the protective tube was inserted into the outer end opening of the well with a slight clearance in the radial direction, and there was also a relative displacement in the axial direction between the pressure tube and the liner tube. The present invention provides a temperature measuring device for insulated piping that prevents damage and facilitates repair and maintenance, prevents high-temperature fluid from flowing into the insulating material, and accurately measures gas temperature. The invention is extremely useful industrially.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are longitudinal sectional views showing a known temperature measuring device for adiabatic piping, respectively, and FIG. 3 is a longitudinal sectional view showing an embodiment of the present invention. 1...Insulating material, 2...Liner tube, 4...Thermocouple, 5...Pressure tube, 7...Protection tube, 8...Insulating material, 9...Well.

Claims (1)

[Claims] 1. A well whose base is airtightly fixed to an opening in the liner pipe wall inserted into the inside of the heat insulating material attached to the inner wall of the pressure pipe, and a well whose tip protrudes into the liner pipe; A protective tube that is airtightly fixed and extends through a heat insulating material, and a temperature sensing element that is inserted into the protective tube through the heat insulating material and whose tip is inserted into the tip of the well, the protective tube. A temperature measuring device for an insulated piping, characterized in that the tip of the well is inserted into the outer end opening of the well with a slight clearance in the radial direction.