JPH0633389Y2 - Tube wall thermometer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a thermometer capable of measuring a fluid temperature inside a pipe through a pipe wall in a pipe of an air conditioner, for example.

(Prior Art) Conventionally, to measure the temperature of a fluid in a pipe, a socket is welded to the outside of the pipe, and a pipe material is inserted into the pipe through the socket,
A means for inserting a thermometer into the insertion tube or a means for attaching a thermocouple to the outside of the tube and measuring the temperature of the internal fluid through the tube wall is already known.

(Problems to be solved by the invention) In the former of the above-mentioned conventional means, the welding means as well as the hole for attaching the socket to the pipe are complicated, and the slag at the time of welding work adheres to the inside of the pipe. The temperature is limited to the part to which the socket is attached, and there are disadvantages such as the inability to change the temperature measurement position. Also, both the one using a thermocouple and the one using the thermocouple are welded to their attachment. Other complicated means were required.

(Means for Solving the Problems) The present invention solves the above-mentioned disadvantages of the prior art and makes it possible to measure the temperature of the internal fluid at any position on the outer surface of the pipe by utilizing the thermal expansion of gas. It is extremely simple, and has a strip-shaped base piece of appropriate thickness made of a flexible heat insulating material, which has an inner peripheral surface that comes into surface contact with the pipe to be measured along its length, and has a thermal expansion property inside. An arcuate temperature measuring tube made of a heat-conductive material containing gas is embedded, the inner peripheral surface is exposed on one surface of the strip-shaped base piece, and the conduit communicating with the temperature measuring tube is led out of the strip-shaped base piece. It will be done.

(Operation) The present invention is intended to be used by mounting a strip-shaped base piece along the circumferential direction of the outer surface of a pipe to be temperature-measured by applying the exposed inner peripheral surface of the temperature-sensitive pipe to the pipe wall. The temperature of is transmitted to the temperature measuring tube through the wall of the tube, and accordingly, the gas in the temperature measuring tube expands in proportion to the heating, so that the degree of expansion is measured and the fluid temperature in the tube is measured. It may be read directly in the field or remotely with the gas conduit lengthened.

(Embodiment) An embodiment of the present invention will be described with reference to the drawings. In the drawing (1)
Is a base piece of a suitable thickness formed in a strip shape from a material having flexibility and heat insulation such as rubber and foamed resin material, and a gas having a high coefficient of thermal expansion such as alcohol and chlorofluorocarbon inside along its length. The arc-shaped temperature measuring tube (2) enclosing (liquid) is embedded,
A gas conduit (3) having its inner peripheral surface exposed on one surface of the strip-shaped base piece (1) and communicating with the inside of the temperature measuring tube (2) was led out of the strip-shaped base piece (1).

It should be noted that the temperature measuring tube (2) is preferably made of a metal having good thermal conductivity such as iron, stainless steel, copper, or brass,
The temperature measuring tube (2) may be attached by attaching an adhesive to the strip-shaped base piece (1) and adhering it thereto. Further, when the foamed synthetic resin is used as the flexible heat insulating material, it is easy to mold by placing a temperature measuring tube in which gas is sealed in a predetermined mold and injecting the foamed material into the mold to foam.

Further, in the illustrated embodiment, the temperature measuring tube (2) has a rectangular cross section, and one side of the temperature measuring tube (2) is exposed on the surface of the strip-shaped base piece (1) to measure the temperature.
The heat transfer effect was improved by widening the contact area with the heat transfer effect and encapsulating the other three surfaces with the heat insulating material of the base piece (1) to enhance the heat insulating effect. It is necessary that the base piece (1) has an inner peripheral surface that comes into surface contact with the tube a, and that the base piece (1) encloses most of the side surface of the temperature measuring tube (2) and the outer peripheral surface.

Further, FIGS. 1 and 2 show the temperature measuring pipe (2) having a length along a circumferential direction of a pipe a to be measured, and when used, as shown in FIG. The two ends of the strip-shaped base piece (1) were connected to the pipe a by connecting both ends of the strip-shaped base piece (1) with a connecting tool such as a string (4), but as shown in FIG.
(1) may be used so as to extend along substantially the entire circumference of the pipe a. In this case, the ends of both base pieces (1) and (1) are put together by a binder (5), or One end of both temperature measuring tubes (2) and (2) is put together by a socket (6), and a gas conduit (3) is led out from the inside of the socket (6).

Next, the means for measuring the temperature due to the gas expansion in the conduit (3) in use will be described.

In FIG. 5A, the gas conduit (3) is connected to the diaphragm or bellows (7) to convert the expansion pressure of the temperature-measuring gas into the linear motion of the bellows (7), and the working rod (8) integrated with the bellows is connected. The pinion gear (10) is rotated by the rack (9) and the temperature scale is directly displayed by the pointer (11) fixed to the shaft, or although not shown, the expansion gas pressure of the known Bourdon tube type pressure gauge is displayed. As shown in FIG. 5B, the movement of the bellows (7) changes the slider (12) integrated with the actuating rod (8) by guiding the Bourdon tube to the deformation of the Bourdon tube with a pointer. The resistor (13) is moved along, the current or voltage in the electric circuit is changed by the change in the resistance value, the pointer is substituted for the temperature measurement, and the fluid temperature in the pipe a is measured by these means.

(Effect of the Invention) According to the present invention, a temperature measuring tube in which a thermally expansive gas is sealed is combined with a strip-shaped base piece made of a flexible heat insulating material,
Align the strip-shaped base piece with the outer surface of the pipe to be measured in the circumferential direction,
Since the inner surface of the temperature measuring tube is brought into surface contact along the circumference of the tube, the fluid temperature in the tube is transmitted through the wide contact surface, the liquid or gas in the temperature measuring tube is heated rapidly, and the measured tube is quickly measured. It has the effect that the temperature of can be measured. Moreover, since the width of the strip-shaped base piece is narrow, it can be mounted at any position on the pipe to be measured, and it can respond to fluctuations in the measurement position, enabling measurement at any position. Since the part is covered with the heat insulating material of the base piece, the temperature of the fluid in the pipe can be accurately grasped without being affected by external heat, and the temperature can be accurately measured, and the handling operation is extremely simple. .

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a perspective view,
FIG. 2 is a cross-sectional view in the use state, and FIG. 3 is a cross-sectional view of FIG.
III-III line sectional view, FIG. 4 is a cross-sectional view of a used state in another embodiment, and FIGS. 5A and 5B are diagrams showing an embodiment of a temperature measuring mechanism. (1) …… Band-shaped base piece, (2) …… Temperature measuring tube, (3) …… Gas conduit

Claims (1)

[Scope of utility model registration request] 1. A strip-shaped base piece having an appropriate thickness and made of a flexible heat insulating material, and having an inner peripheral surface that comes into surface contact with the pipe to be measured along the length direction thereof, and has a thermally expansive gas inside. By embedding an arcuate temperature measuring tube made of enclosed heat-conductive material, exposing its inner peripheral surface to one surface of the strip-shaped base piece, and leading out a conduit communicating with the temperature measuring tube to the outside of the strip-shaped base piece. A tube wall thermometer consisting of.