JP2574973Y2 - Furnace viewing window device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-furnace viewing window apparatus suitable for monitoring the situation in a blast furnace, a heating furnace, a heat treatment furnace and the like.

[0002]

2. Description of the Related Art Conventionally, a window having a predetermined diameter is formed in a furnace wall to monitor the inside of a high-temperature furnace, a window glass is mounted, an objective lens is provided opposite the window, and light condensed by the objective lens is provided. Or to a television camera via an eyepiece. In this case, the window glass is purged with a clean gas to clean and cool the surface. Furthermore, since the airtightness is required between the objective lens and the inside of the furnace, the window glass is cleaned when the high-temperature furnace is stopped.

In the above-mentioned conventional in-furnace viewing window apparatus, since a shield that can selectively shield between the inside of the furnace and a window glass provided on the furnace wall is not provided, it is extremely inconvenient for maintenance management. There was a problem. In order to solve such a problem, a heat-resistant glass is interposed between a window formed in a furnace wall and an objective lens, a pedestal provided with the heat-resistant glass is configured to be rotatable, and the pedestal is rotationally driven. In some cases, the objective lens and the inside of the furnace are selectively shielded based on the position of the pedestal.

[0004]

However, as described above, when the heat-resistant glass provided on the pedestal is rotated, the furnace interior viewing window device is configured to selectively shield the objective lens and the interior of the furnace. Is easier to maintain than the conventional case without the above-mentioned shield, but it is still not enough, which complicates the drive mechanism of the pedestal provided with heat-resistant glass and requires a large space for the pedestal rotation. As a result, there is a problem that the device becomes large and the configuration for airtightness becomes complicated.

An object of the present invention is to provide an in-furnace sight glass apparatus which can selectively open and close a sight hole formed in a furnace wall with a simple driving mechanism, and which is small in size, simple in construction and easy to maintain. With the goal.

[0006]

The in-furnace viewing window apparatus of the present invention is provided with a through-hole for penetrating the inside of the furnace and the outside of the furnace, and has a cone portion extending from the vicinity of the outside of the through-hole. And a width in a direction perpendicular to the axis of the sliding rod body, wherein the insertion hole is formed in which the sliding rod body is slidably and airtightly inserted. An opening having a width smaller than the diameter of the sliding rod body is formed, and a space portion is formed concentrically from the opening to each end surface side of the furnace inside and the furnace outside concentrically, and the space is formed. A locking member concentrically attached to a furnace wall provided with an opening concentrically with the portion, and a detachably and airtightly attached to the furnace outer end face of the locking member so that the furnace outside of the locking member Purging the heat-resistant glass to be sealed and the space formed between the sliding rod body and the heat-resistant glass Characterized by comprising a gas passage for introducing the gas for.

The gas passage may be provided in the sliding rod body, and may be a through hole that opens to the heat-resistant glass side of the cone of the sliding rod body.

The gas passage is provided in the sliding rod body, has an opening on the heat-resistant glass side of the cone of the sliding rod body, and the extension of the opening is eccentric from the center of the heat-resistant glass. It may be a through hole provided so as to be in contact with the heat-resistant glass at the position and to be oblique to the heat-resistant glass surface.

[0009]

According to the in-furnace viewing window device of the present invention, when the sliding rod is driven so that the through hole and the opening face each other, an optical path connecting the inside and outside of the furnace is formed through the through hole and the opening. As a result, the inside of the furnace can be seen through the heat-resistant glass, and the situation inside the furnace can be observed. In this case, since the optical path extends from the through hole to the inside and outside of the furnace, it is easy to observe the inside of the furnace, and the diameter of the through hole can be small. When the sliding rod is driven to close the through hole with the locking member, the opening is closed by the sliding rod and the optical path is cut off. In this case, the inside of the furnace and the outside of the furnace are shut off by the sliding rod body, and the high-temperature gas in the furnace is not discharged outside the furnace.
Maintenance such as replacement of heat-resistant glass becomes easy. Further, the structure is simple because the sliding rod body slides inside the locking member, and the space required is also small.

When the gas passage for purging the surface of the heat-resistant glass is a through hole provided in the sliding rod body which opens on the heat-resistant glass side of the cone of the sliding rod body, the gas passage is separately provided. The required space is eliminated, and the required space is reduced.

Further, the gas passage provided in the sliding rod body has an opening on the heat-resistant glass side of the cone of the sliding rod body, and the extension of the opening is eccentric from the center of the heat-resistant glass. When the through-hole is provided so as to abut the heat-resistant glass and obliquely cross the heat-resistant glass surface, the gas blown to the heat-resistant glass for purging the surface of the heat-resistant glass becomes a swirling flow, and the heat-resistant glass furnace is used. Adhesion of dust to the inner surface is effectively prevented. In addition, the purged gas also flows out into the furnace as a swirling flow, thereby preventing the generation of a low-pressure part in the furnace caused by the straight outflow, and preventing the adhesion of dust to the furnace-side conical surface of the locking member. Is prevented.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG. 1 is a sectional view of one embodiment of the present invention, and FIG. 2 is a front view of one embodiment of the present invention.

In the furnace viewing window apparatus of this embodiment, a tapered opening 3 is provided at a predetermined position on a furnace wall 1 of a high-heat furnace so as to look inside the furnace. A locking member 5 is attached by appropriate means so as to be concentric with the opening 3 and cover the opening 3 from the outside of the furnace wall.

The locking member 5 comprises a flange portion 9 having a flange-shaped protrusion 7 for positioning along the inner peripheral surface and a guide portion 11, and the guide portion 11 is concentric with the protrusion portion 7. It is attached. The flange portion 9 and the guide portion 11 have an insertion hole 12 through which a sliding rod body 15 is inserted slidably and airtightly.
Are provided, and the sliding bar band 15 is inserted.

The guide portion 11 is provided with an opening 13 having a width in a direction perpendicular to the axis of the sliding rod 15 smaller than the diameter of the sliding rod 15 and communicating with the insertion hole 12. It is. Further, the guide portion 11 is formed with a space portion extending in a pyramid shape from the opening portion 13 to both ends on the inside and outside of the furnace.

A heat-resistant glass 17 is detachably and air-tightly attached to an end face of the guide portion 11 on the outside of the furnace, and the outside of the furnace of the guide portion 11 is sealed by the heat-resistant glass 17 to form a sliding rod body. A space 31 is formed between 15 and the heat-resistant glass 17. Here, as the heat-resistant glass 17, a glass that withstands a temperature corresponding to the furnace temperature and that transmits a light beam having a predetermined wavelength is selected.

The sliding rod 15 is provided with a through hole 21 for forming an optical path extending through the inside and outside of the furnace and reaching the inside of the furnace. Conical parts 23 and 25 extending from the end of the through hole 21 are formed in the sliding rod body 15, and through holes 27 respectively opening on the surfaces of the conical parts 23 and 25 on the heat-resistant glass 17 side.
29 are provided. Further, the openings of the through holes 27 and 29 are formed such that the extended lines of the openings abut the heat-resistant glass at a position eccentric from the center of the heat-resistant glass and are oblique to the surface of the heat-resistant glass.

A purge gas such as nitrogen having a predetermined pressure higher than the furnace pressure is supplied from a purge gas source (not shown) to the through holes 27 and 29, and the supplied purge gas is supplied to the through holes 27 and 29. By discharging the heat-resistant glass 17 through the space 29 and purging the surface of the heat-resistant glass 17 on the space 31 side, dust on the surface of the heat-resistant glass 17 on the space 31 side is removed and the heat-resistant glass 17 is cooled. The purge gas after the purge is discharged into the furnace through the through holes 21.
The openings of the through holes 27 and 29 are formed so that the extension lines of the openings abut the heat-resistant glass at a position eccentric from the center of the heat-resistant glass and are oblique to the heat-resistant glass surface. The purge gas blown to the surface of the glass 17 becomes a swirling flow, and can effectively prevent dust from adhering to the surface of the heat-resistant glass 17 on the space 31 side.

One end of the sliding bar 15 is connected to a piston of an actuator 35 fixed by a pedestal member 33 attached to the locking member 5, and the sliding bar 15 is reciprocated by the piston. In step 1, it is driven up and down. The driving of the sliding rod 15 by the piston can selectively form an optical path leading into and out of the furnace. Through hole 21
When the sliding rod 15 is driven to a position substantially concentric with the through hole 3 of the furnace wall 1, an optical path is formed by the through hole 21, and the situation in the furnace is changed to the heat resistant glass 17 and It can be observed from outside the furnace through the through holes 21.

In the state where the optical path is formed, a purge gas is supplied to cool the heat-resistant glass 17 and, at the same time, is purged to prevent dust from adhering to the surface of the heat-resistant glass 17 on the space 31 side. The purged gas for purge is discharged into the furnace through the through hole 21. Since the purge gas is swirling, when the purged gas is discharged into the furnace, the purged gas also flows into the furnace as a swirling flow, preventing the occurrence of low-pressure parts in the furnace caused by linear outflow. Thus, it is possible to prevent dust from adhering to the inner peripheral surface of the guide portion 11 on the furnace side.

When the sliding rod 15 is driven by driving the piston until the through-hole 21 is positioned outside the optical path, as shown by a dashed line in FIG. And opening 1
Numeral 3 is sealed by a sliding bar 15, the inside and outside of the furnace are sealed by the sliding bar 15, and the optical path is also shut off. In this state, since the inside and outside of the furnace are shut off, the heat-resistant glass 17 can be easily replaced.
The heat-resistant glass 17 can be easily maintained. In this state, the supply of the inert gas to the through holes 27 and 29 is stopped. This stop prevents a pressure increase in the space 31.

Further, a through-hole (not shown) is provided in the flange portion 9 to supply a purging gas to the surface of the heat-resistant glass 17 opposite to the space 31, thereby purging both surfaces of the heat-resistant glass 17 with the purging gas. , May be cooled.

In the above-described embodiment, the heat-resistant glass 17 is purged by the purge gas passing through the through holes 27 and 29.
Was illustrated, but the through holes 27 and 29 were purged.
Instead, a through-hole is provided in the guide portion 11 between the heat-resistant glass 17 and the sliding rod 15 to communicate with the space 31, and a purge gas is supplied through the through-hole to purge one surface of the heat-resistant glass 17. And may be cooled.

An example of the use of the in-furnace viewing window apparatus of the embodiment configured as described above will be described by taking as an example a case where the inside of a blast furnace is photographed.

As shown in FIG. 2, in order to look into the furnace opening of the blast furnace 50, two in-furnace viewing windows are provided on the furnace wall 51 in close proximity to one another. An infrared light source device 55 for illumination is installed on the end face 53 of the flange portion 9 of the above, and infrared rays emitted from the infrared light source device 55 for illumination through a wide-angle lens 57 that transmits light of an infrared wavelength range are viewed through the furnace. Through the blast furnace 50 to illuminate the inside of the furnace.

An image pickup device 54 is provided on the end face 52 of the flange portion 9 of the other furnace window device B, and the infrared light reflected from the furnace by the illumination is converted into the infrared light having a wavelength in the infrared region of the furnace window device B. The image pickup device 54 is configured to receive light by the image pickup device 54 through a wide-angle lens 56 that transmits light and to take an image.
The television signal output from 4 is displayed by the receiver.

When imaging the inside of the blast furnace 50 with the above configuration, the actuators 35 of the viewing window devices A and B in both furnaces are used.
To form an optical path through the through holes 21 of the in-furnace viewing windows A and B. The blast furnace 5 is irradiated with infrared rays emitted from the illumination infrared light source device 55 through the formed optical path.
A predetermined range C to D within 0 is illuminated. The illumination also illuminates the dark portions in the predetermined ranges C to D, and the predetermined range C
The images in D are captured by the imaging device 54.

In this case, the heat-resistant glass 17 of the in-furnace viewing windows A and B is purged by a purge gas, and is cooled and dust-removed. You can get a picture. In addition to taking pictures of the conditions inside the furnace, the present invention can also be used to measure the temperature inside the furnace through the furnace viewing window device of the present invention.

[0029]

As described above, according to the in-furnace viewing window apparatus of the present invention, when the sliding rod is driven so that the through hole and the opening face each other, the inside and outside of the furnace are opened and closed. When the through-hole is closed with the locking member, the opening is configured to be closed by the sliding rod, so that the optical path is selected by driving the sliding rod. Thus, there is an effect that the optical path can be formed efficiently and the selection of the optical path formation is easy. Furthermore, since the sliding rod body is configured to slide in the locking member, the structure is simple and the required space is small.

Further, according to the present invention, the sliding rod body is formed with a cone, and the locking member is formed with a space that expands in a cone shape. In some cases, an optical path is formed through the cone and the space, and the angle of the cone in the cone and the space can be larger than the angle of the cone in the sphere. Since the inside and the outside are spread at a wide angle, the inside of the furnace can be easily observed, and the diameter of the through-hole can be reduced. When the optical path is interrupted, the opening is closed by a sliding rod, the inside of the furnace and the outside of the furnace are airtightly shut off by the sliding rod, and the high-temperature gas in the furnace is discharged outside the furnace. There is an effect that maintenance such as replacement of heat-resistant glass is facilitated without being discharged to the heat sink.

Further, since the heat-resistant glass can be provided close to the through hole of the sliding rod, the area of the heat-resistant glass can be reduced, and the area of the heat-resistant glass can be reduced. This has the effect of ending. In addition, since the diameter of the through hole of the sliding rod body can be small, the flow rate of the purge gas flowing into the furnace through the through hole becomes faster, and particles such as particles enter the heat resistant glass side from the furnace. There is no effect.

When the gas passage for purging the surface of the heat-resistant glass is a through-hole provided in the sliding rod and opened to the heat-resistant glass side of the cone of the sliding rod, the gas passage is provided for the gas passage. There is no space required separately, which has the effect of reducing the required space.

The gas passage provided in the sliding rod body has an opening on the heat-resistant glass side of the cone of the sliding rod body, and the extension of the opening is eccentric from the center of the heat-resistant glass. When the through-hole is provided so as to be in contact with the heat-resistant glass and to be oblique to the surface of the heat-resistant glass, the gas blown to the heat-resistant glass for purging the surface of the heat-resistant glass becomes a swirling flow, and the inside of the furnace of the heat-resistant glass is formed. There is an effect that dust can be effectively prevented from adhering to the surface.

In this case, since the purge gas is in a swirling flow, when the purged gas is discharged into the furnace,
The purged gas also flows out into the furnace as a swirling flow, and the generation of a low-pressure portion in the furnace caused by the straight outflow is prevented, and the adhesion of dust to the furnace-side conical surface of the locking member can be prevented. effective.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a front view of one embodiment of the present invention.

FIG. 3 is a schematic diagram illustrating an example of use of an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace wall 3 Opening 5 Locking member 12 Insertion hole 13 Opening part 15 Sliding rod 17 Heat resistant glass 21 Through hole 23 and 25 Conical part 27 and 29 Through hole

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F23M 11/04 101 F23M 11/04 103

Claims (3)

(57) [Scope of request for utility model registration] 1. A sliding rod body provided with a through-hole for penetrating the inside of the furnace and the outside of the furnace, and having a cone portion extending from the vicinity of the outside of the through-hole; An insertion hole slidably and airtightly inserted is formed, and has an opening communicating with the insertion hole and having a width smaller than a diameter of the sliding rod body in a direction perpendicular to an axis of the sliding rod body. Are formed concentrically from the opening to the furnace inner side and the furnace outer end surfaces, respectively, and are respectively concentric with the furnace wall provided with an opening concentrically with the space. A heat-resistant glass detachably and air-tightly attached to a furnace outer end surface of the lock member to seal the furnace outside of the lock member; A gas passage for introducing gas for purging into a space formed between the glass and the glass; An in-furnace viewing window device. 2. The in-furnace viewing window apparatus according to claim 1, wherein the gas passage is provided in the sliding rod body, and is a through hole that opens to the heat-resistant glass side of the cone of the sliding rod body. Peep window device inside the furnace. 3. The in-furnace viewing window apparatus according to claim 1, wherein the gas passage is provided in the sliding rod body, and has an opening on the heat-resistant glass side of the cone of the sliding rod body. An in-furnace viewing window device, characterized in that the extension line is a through hole provided so as to abut the heat resistant glass at a position eccentric from the center of the heat resistant glass and to be oblique to the surface of the heat resistant glass.