JPS58160828A - Black body furnace - Google Patents

Abstract

PURPOSE:To facilitate equipping operations of a heat generating wire and to improve the temperature distribution of the whole metallic block by heating the bottom also, by laying the heat generating wire which is inserted into an insulating tube in the outer circumference and bottom grooves of the metallic block. CONSTITUTION:Plural partition walls (projected groove) 1a are provided in a longitudinal direction of the outer circumference surface and the bottom of a metallic block 1 and plural groove parts are provided between the walls 1a and then, heat generating wires 2 inserted into plural insulating tubes 1b are embedded in these groove parts. One end of the block 1 is opened and a hollow part is made in the block 1 and a groove 1c is formed on the inner wall of the inner part of the hollow part in order to increase emissivity. Further, heat conduction from the wire 2 is improved by enlarging an opening diameter of an opening part 1d and temperature lowering at the part 1d is lessened. This metallic block is housed in an outer cylinder 3 having a cylinder 3a and a cover 3b.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of the Invention The present invention relates to a blackbody furnace with good temperature distribution used for calibrating a radiation temperature needle, etc.

(2) Prior Art Conventionally, most blackbody furnaces have been constructed by winding a heating element (heater) around a core tube with an open end and a hollow interior, and providing a heat insulating layer around the outer periphery of the heater. however.

The heater of such a conventional black body furnace has a round shape in which only the outer peripheral portion is wound in a K spiral shape.

There were disadvantages such as a temperature drop at the bottom of the cavity, resulting in temperature distribution, and the installation work of the heater was complicated.

(2) Purpose of the Invention The purpose of the present invention is to provide a blackbody furnace with good workability and good temperature distribution in view of two or more points.

(4) Embodiments of the Invention Fig. 1 is a bottom view #iL of the metal block according to the invention, Fig. 2 is a partially explanatory side view, and Fig. 3 is a partially cross-sectional explanatory view of the outer cylinder. It is.

In the figure, l is a metal block, with a plurality of gaps am (protrusions #) 1a on its outer peripheral surface in the longitudinal direction and on the bottom, and these gaps @ 1 a l! A plurality of grooves are provided.

A heating wire 2 inserted through a plurality of insulating tubes 1b is buried in this groove. The metal block has an opening at one end and a cavity inside, and a groove IC is formed on the inner wall at the back of the cavity to increase the emissivity. Well done.

This reduces the temperature drop at the opening.

Then, this metal block assembly is housed in an outer cylinder 3 having a cylinder 3a and a lid 3b as shown in FIG.

In this way, the heating wires 2 are arranged in a straight line.

Since the metal block is housed in the outer cylinder, installation work such as wiring and mounting is easy, and since the bottom is also heated, the temperature distribution is extremely good, making it possible to create a good blackbody furnace.

In addition, by forming a groove on the inner wall at the back of the cavity of the metal block 1, the emissivity of the cavity wall can be increased, or the opening diameter can be increased to make the wall thinner and the heat conduction from the heating wire 9 can be improved. This is to prevent a drop in temperature at the opening.

Further, as shown in FIG. 4, the blackbody furnace 4 according to the present invention is housed inside a furnace body 50 having an outer wall 5a, an inner wall 5b, and a heat insulating layer 5C, and an auxiliary heater 6 is provided on the outer periphery of the opening thereof. As a result, the heating effect is further increased.

In addition, in Fig. 4, 7 is a radiation thermometer to be calibrated.

FIG. 2 IC is a 4111 quasi-temperature needle insertion hole.

(5) Approval of the Invention As stated above, the present invention is a blackbody furnace in which a nine-heat embroidery is embedded in the outer periphery and bottom groove of a metal block through an insulating tube.

(6) Effects of the invention ■ Heat-generating wires are provided in the parallel grooves on the outer periphery and bottom of the metal block, making it easy to install one heat-generating wire, and since the bottom is also heated, the temperature is distributed throughout the metal block. will be good.

■If #I is formed inside the hollow part of the metal block to increase the emissivity and the opening diameter is made large, heat conduction from the heating wire will be good, and a drop in temperature at the opening can be prevented. It becomes more isothermal.

■ By providing an auxiliary heater at the opening of the blackbody furnace, it is possible to prevent a drop in temperature at the opening, resulting in even better temperature distribution.

[Brief explanation of the drawing]

FIG. 1, FIG. 2, FIG. 3, and FIG. 4 are configuration explanatory diagrams showing one embodiment of the present invention. 1... Soaking block, la... Partition wall, lb
...Insulated tube. 2... Exothermic wire, 3... Outer periphery, 4... Black body furnace, 6...
...Auxiliary heater patent applicant Chino Seisakusho Co., Ltd.

Claims (1)

[Scope of Claims] 1. A metal block having a hollow inside with an opening at one end with several grooves formed in the longitudinal direction of the outer peripheral surface and the bottom, and an insulating tube buried in the grooves of this metal block. A blackbody furnace characterized by having a heating wire passed through and an outer cylinder housing the metal block. 2. The blackbody furnace according to claim 1, wherein a groove is formed in the inner wall of the cavity of the metal block. 3. The blackbody furnace according to claim 1 or 2, characterized in that the diameter of the opening of the cavity of the metal block is increased. t. The black body furnace according to any one of claims 1 to 3, further comprising an auxiliary heater on the outer periphery of the opening of the black body furnace.