JPS5928332Y2 - Optical pyrometer mounting part sealing device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an optical pyrometer mounting portion sealing device.

Conventionally, an optical pyrometer has been used to measure the temperature of a material to be heated loaded in a heat treatment furnace.

This optical pyrometer is installed at the outside opening of a detection tube that has an opening close to the material to be heated loaded in the furnace and an opening that penetrates the furnace wall and projects outward. The temperature of the heated material is detected through the tube.

On the other hand, in order to prevent the optical pyrometer from being damaged or clouded by the high heat in the furnace, an air curtain or air seal is conventionally provided between the detection tube and the optical pyrometer.

However, with a structure equipped with an air curtain,
While the atmosphere inside the furnace is exhausted to the outside by the air flow of the air curtain, outside air enters the furnace, so it is not suitable for use in an optical pyrometer for a heat treatment furnace.

In addition, in the structure provided with an air seal, air is blown into the detection tube, so that the atmosphere inside the furnace is prevented from flowing out to the outside, but there is a drawback that the seal air intrudes into the inside of the furnace.

The present invention has been developed in view of the above-mentioned drawbacks of the conventional art, and is designed to ensure the sealing of the detection tube, prevent the atmosphere inside the furnace from being discharged to the outside of the furnace, and prevent outside air from entering the inside of the furnace.
An object of the present invention is to provide an optical pyrometer mounting part sealing device that can protect an optical pyrometer from high heat in a furnace.

Next, the present invention will be explained with reference to the drawings, which are one embodiment.

In the figure, reference numeral 1 denotes a sealing device for the optical pyrometer mounting portion. and a fan 11 connected via piping 9 having a cock 10 in the middle.

Each nozzle 6.6 is provided in the pair of seal parts 3 and 4 of the sealing device main body 2 so as to open opposite to the seal passage 5 and to face inward, and the seal parts 3 and 4 are different from each other. , are arranged oppositely at a predetermined interval between them to form a passage 7 for discharging the sealing gas, and are integrally formed with a frame 8, and each of the nozzles 6
are connected to the fan 11 via piping 9, respectively.

The lower opening 8a of the sealing device main body 2 is connected to a mounting bracket 12.
an opening 15 outside the furnace 13 of the detection tube 13, which has an opening 14 close to the material to be heated 18 loaded into the heat treatment furnace 16 through the furnace wall 17 and an opening 15 projecting outward through the furnace wall 17;
On the other hand, the upper part of the sealing device main body 2 connects the opening 8b of the frame 8 to an optical pyrometer 19.
The detection portion, the seal passage 5 and the detection tube 13 are located in a straight line.

Next, the operation of the optical pyrometer mounting portion sealing device 1 having the above structure will be explained.

The air forced by the drive of the fan 11 passes through the piping 9 and each cock 10 to seal parts 3 and 4 of the sealing device main body 2.
The liquid flows into the seal portions 3 and 4, respectively, and is ejected from the nozzles 6 provided in the seal portions 3 and 4 into the seal passage 5 inwardly from each other.

The air ejected into the seal passage 5 collides with each other within the seal passage 5, moves toward the seal gas discharge passage 7 provided between the seal portions 3 and 4, and the air is discharged from the passage 7.
It is discharged outward from the sealing device main body 2 through.

Now, the distance between the sealing parts 3 and 4 of the sealing device main body 2 is l.
, the static pressure of the air inside the seal passage 5 is Pl, and the pressure of the atmosphere inside the heat treatment furnace 16 is P.

By adjusting the distance 1, the static pressure P1 of the air inside the seal passage 5 is reduced to the pressure P of the atmosphere inside the heat treatment furnace 16.

Pressure P equal to or above.

Pressure P, taking into account fluctuations in. Set it slightly smaller.

That is, when P1≦Po, the atmosphere inside the heat treatment furnace 16 hardly flows out through the detection tube 13 due to the above pressure relationship.

Furthermore, the air in the seal passage 5 is discharged outward from the low-pressure passage 7 and does not flow into the heat treatment furnace 16 through the detection tube 13, so that the atmosphere in the detection tube 13 is completely sealed. At the same time, due to the presence of air from nozzle 6, optical pyrometer 19 will not be disturbed by high heat from heat treatment furnace 16.

As is clear from the above description, the present invention provides a pair of box-shaped seal parts spaced apart from each other at the outside opening of the detection tube, each having a seal passage in the center and a nozzle facing the seal passage. A sealing gas discharge passage is formed between the two boxes by opening the boxes and arranging the nozzles so as to face each other inwardly, and after the sealing gas ejected from the nozzles toward the sealing passage collides within the sealing passage. Since the seal gas flows out into the above-mentioned seal gas discharge passage, by balancing the pressure inside the seal passage and the pressure inside the furnace, it is possible to ensure the sealing of the outer end of the detection tube. Intrusion can be prevented.

Furthermore, since the detection tube is reliably sealed, the optical pyrometer can be protected from the high heat inside the furnace.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the optical pyrometer attachment sealing device according to the present invention installed between the outside opening of the detection tube and the optical pyrometer, and FIG. 2 is the sealing device in FIG. 1. FIG. 3 is an enlarged sectional view of the main body. 1... Optical pyrometer mounting part sealing device, 2...
... Seal device main body, 3, 4 ... Seal part, 5
... Seal passage, 6 ... Nozzle, 7.
... Seal gas discharge passage, 9 ... Piping,
11...Fan, 13...Detection tube, 1
4.15... Opening, 16... Heat treatment furnace, 17... Furnace wall, 18... Material to be heated, 19... Optical pyrometer.

Claims (1)

[Scope of utility model registration request] In a sealing device for sealing between a detection tube installed with one end close to the material in the heat treatment furnace and the other end protruding outside the furnace wall, and an optical pyrometer that detects the temperature of the material through the detection tube. , a pair of boxes having a seal passage in the center and provided with nozzles facing each other toward the seal passage are arranged at a distance between the optical pyrometer and the outer end of the detection tube; A sealing gas discharge passage is formed between the two boxes by arranging the nozzles to face each other inwardly, and the sealing gas ejected from each nozzle toward the sealing passage collides within the sealing passage, and then seals the seal. A sealing device for a mounting portion of an optical pyrometer, characterized in that it is configured so that gas flows out from a gas discharge passage.