JP2017166739A - Monitoring window - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring window that prevents a transparent plate from breaking in fastening it, prevents air from flowing in or out from the monitoring window and can improve reliability, economical efficiency and maintainability.SOLUTION: The monitoring window 5 in which a closure flange 6 to which the transparent plate 7 is fitted is attached to a furnace 2 of a boiler 1 as a structure to check the interior of the furnace 2 includes: a main fastening member 11 for fixing the closure flange 6; a lid member 8 for pressing the transparent plate 7; and an auxiliary fastening member 12 for fixing the lid member 8.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a viewing window.

  Coal-fired power plants using pulverized coal-fired boilers have played an important role due to the recent rise in prices associated with increasing demand for oil and natural gas.

  By the way, in the boiler as mentioned above, the observation window for monitoring the flame condition of a burner and the adhesion condition of a clinker is provided in the furnace.

  The conventional viewing window was attached to the furnace as a structure by a fastening member such as a bolt so that a transparent plate such as glass was pressed by a metal closing flange having a through hole. .

  In addition, although it is not for boilers, there exists patent document 1 as what shows the general technical level of a sight glass, for example.

JP 2003-90433 A

  However, as described above, if the transparent plate is attached to the furnace by the fastening member so as to be directly pressed by the closing flange, the transparent plate may be cracked when the fastening member is tightened.

  In addition, when the tightening force of the fastening member is adjusted so that the transparent plate is not broken, air may flow in or out through the viewing window.

  Furthermore, the temperature rise due to radiant heat transfer from the inside of the furnace has not been considered in the conventional viewing window.

  The present invention has been made in view of the above-described conventional problems, and prevents cracking of the transparent plate during tightening and prevents inflow / outflow of air from the viewing window, thereby improving reliability, economy, and maintainability. An object of the present invention is to provide a viewing window that can improve the performance.

The present invention attaches a closing flange fitted with a transparent plate to a structure, and in a viewing window for confirming the inside of the structure,
A main fastening member for fixing the closing flange;
A lid member for holding the transparent plate;
And an auxiliary fastening member for fixing the lid member.

In the viewing window, a concave groove formed in the through hole of the closing flange and into which the transparent plate is inserted,
A first packing interposed between the concave groove and the transparent plate;
A second packing interposed between the transparent plate and the lid member,
The lid member may be attached to the outer surface of the closing flange by the auxiliary fastening member.

In the viewing window, a storage groove for fitting the transparent plate is formed in the inner peripheral portion, and the cylindrical portion is inserted into the through hole of the closing flange, and from the end of the cylindrical portion to the outer periphery. A transparent plate storage member provided with a protruding flange portion,
The lid member is attached to the flange portion so as to press the transparent plate fitted in the storage concave groove of the transparent plate storage member,
The auxiliary fastening member includes a first auxiliary fastening member that attaches the lid member to the flange portion of the transparent plate housing member, and a second auxiliary fastening member that attaches the flange portion of the transparent plate housing member to the outer surface of the closing flange. Prepared,
A first packing interposed between the housing concave groove and the transparent plate;
And a second packing interposed between the transparent plate and the lid member.

The first auxiliary fastening member and the second auxiliary fastening member are disposed so that a circumferential position of the flange portion is shifted,
The lid member may include a cutout portion that avoids interference with the second auxiliary fastening member.

  A purge hole may be provided so as to be communicated in a radial direction with the cylindrical portion of the closing flange and the transparent plate housing member and for injecting purge air to the inner peripheral surface of the cylindrical portion.

  You may provide the closing plate attached by the said 2nd auxiliary | assistant fastening member so that the said through-hole may be plugged up with respect to the outer surface of the said closing flange instead of the said transparent plate accommodation member.

  According to the viewing window of the present invention, it is possible to prevent cracking of the transparent plate at the time of tightening and prevent inflow / outflow of air from the viewing window, thereby improving reliability, economical efficiency and maintainability. Can have an effect.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram which shows the 1st Example of the viewing window of this invention, Comprising: (a) is a front view, (b) is Ib-Ib sectional drawing of Fig.1 (a). It is a schematic block diagram which shows the 2nd Example of the viewing window of this invention, Comprising: (a) is a front view, (b) is IIb-IIb sectional drawing of Fig.2 (a). It is a disassembled perspective view which shows the 2nd Example of the observation window of this invention. It is a schematic block diagram which shows the closing plate attached instead of a transparent plate accommodation member in 2nd Example (or 3rd Example) of the viewing window of this invention, (a) is a front view, (b) is a side view FIG. It is a schematic block diagram which shows the 3rd Example of the viewing window of this invention, Comprising: (a) is a front view, (b) is Vb-Vb sectional drawing of Fig.5 (a), (c) is FIG. ) Is a Vc-Vc cross-sectional view, and FIG. 5D is a Vd-Vd cross-sectional view of FIG. It is a disassembled perspective view which shows the 3rd Example of the observation window of this invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 shows a first embodiment of the viewing window of the present invention.

  In the first embodiment, as shown in FIGS. 1 (a) and 1 (b), an opening 3 is formed at a required portion of a furnace 2 of a boiler 1 as a structure, and an annular mounting seat 4 is provided. A viewing window 5 for confirming the inside is attached to the mounting seat 4.

  The viewing window 5 includes a metal closing flange 6, a transparent plate 7 made of heat-resistant glass, and a lid member 8 made of a metal thin plate.

  The closing flange 6 has a through hole 6a formed in the center thereof, and a concave groove 6b is formed in the through hole 6a. The transparent plate 7 is fitted into the concave groove 6b and is pressed by the lid member 8. It is supposed to be.

  A first packing 9 having heat resistance is interposed between the concave groove 6 b and the transparent plate 7, and a second packing 10 having heat resistance is interposed between the transparent plate 7 and the lid member 8. It comes to be intervened.

  A plurality of mounting screw holes 4a (eight in the example of FIG. 1A) are provided in the mounting seat 4 in the circumferential direction, and the closing flange 6 is provided in correspondence with the mounting screw holes 4a. A closing fastening hole 6c is formed, and a main fastening member 11 such as a bolt is inserted through the closing fastening hole 6c and screwed into the mounting screw hole 4a, whereby the closing flange 6 is fixed to the mounting seat 4. ing.

  A plurality of (8 in the example of FIG. 1A) closing screw holes 6d are provided on the outer surface of the closing flange 6 in the circumferential direction on the center side from the closing fastening hole 6c, and the closing screw hole 6d. The lid member 8 is provided with a lid fastening hole 8b, and an auxiliary fastening member 12 such as a bolt is inserted through the lid fastening hole 8b and screwed into the closing screw hole 6d. The transparent plate 7 is pressed against the outer surface of the closing flange 6.

  The lid member 8 is larger in diameter than the transparent plate 7, and has a viewing hole 8 a having a smaller diameter than the outer diameter of the transparent plate 7 in the center, and the inside of the furnace 2 through the transparent plate 7 from the viewing hole 8 a. Can be confirmed.

  Next, the operation of the first embodiment will be described.

  The transparent plate 7 is fitted into the concave groove 6 b of the closing flange 6 via the first packing 9, the transparent plate 7 is pressed by the lid member 8 via the second packing 10, and the lid fastening hole 8 has a lid fastening hole 8 b. When the auxiliary fastening member 12 is inserted and screwed into the closing screw hole 6 d, the lid member 8 is fixed to the outer surface of the closing flange 6.

  The closing flange 6 fitted with the transparent plate 7 and pressed by the lid member 8 is fixed to the mounting seat 4 when the main fastening member 11 is inserted through the closing fastening hole 6c and screwed into the mounting screw hole 4a of the mounting seat 4. Is done.

  Thus, in the first embodiment, unlike the conventional case, the transparent plate 7 is attached to the furnace 2 by the fastening member so as to be directly pressed by the closing flange 6, and the transparent plate 7 is fastened when the main fastening member 11 is fastened. No cracking occurs.

  Further, since it is not necessary to increase or decrease the tightening force of the main fastening member 11 so that the transparent plate 7 is not broken, there is no fear of air flowing in or out of the viewing window 5.

  Incidentally, in the first embodiment, the transparent plate 7 is made of heat-resistant glass, and a first packing 9 having heat resistance is interposed between the concave groove 6b and the transparent plate 7, and the transparent plate Since the second packing 10 having heat resistance is interposed between the cover member 8 and the lid member 8, even if the temperature of the observation window 5 rises due to radiant heat transfer from the inside of the furnace 2, There is no particular problem. Thereby, the worker can monitor the state of flame of the burner and the state of adhesion of the clinker in the furnace 2 of the boiler 1 from the viewing window 5.

  Thus, cracking of the transparent plate 7 at the time of tightening can be prevented, and inflow and outflow of air from the viewing window 5 can be prevented, so that reliability, economy, and maintainability can be improved.

  2 to 4 show a second embodiment of the viewing window according to the present invention. In the figure, the same reference numerals as those in FIG. 1 denote the same parts.

  The feature of the second embodiment is that a transparent plate housing member 13 is provided as shown in FIGS.

  The transparent plate housing member 13 includes a tubular portion 13b in which a housing concave groove 13a for fitting the transparent plate 7 is formed in an inner peripheral portion and is fitted into the through hole 6a of the closing flange 6, and the tubular shape And a flange portion 13c protruding from the end of the portion 13b to the outer periphery.

  A plurality of closing screw holes 6d (eight in the examples of FIGS. 2A and 3) are provided on the outer surface of the closing flange 6 in the circumferential direction on the center side from the closing fastening hole 6c. A housing fastening hole 13d is formed in the flange portion 13c of the transparent plate housing member 13 so as to correspond to the screw hole 6d.

  The flange portion 13c of the transparent plate storage member 13 has a plurality of storage lid fixing holes 13e (four in the example of FIGS. 2A and 3) in the circumferential direction on the center side from the storage fastening hole 13d. A lid fastening hole 8b is formed in the lid member 8 so as to correspond to the storage lid fixing hole 13e.

  The lid member 8 is fixed to the outer surface of the flange portion 13c of the transparent plate housing member 13 by a first auxiliary fastening member 12a as the auxiliary fastening member 12, and the transparent plate 7 is pressed. The first auxiliary fastening member 12a is composed of a bolt 12aB and a nut 12aN. The storage lid fixing hole 13e is provided with a large-diameter groove portion 13f on the inner surface side of the flange portion 13c of the transparent plate storage member 13 in which the head of the bolt 12aB can be accommodated.

  By inserting a second auxiliary fastening member 12b as an auxiliary fastening member 12 such as a bolt from the housing fastening hole 13d and screwing it into the closing screw hole 6d, the flange portion 13c of the transparent plate housing member 13 becomes the outer surface of the closing flange 6. It is supposed to be fixed against.

  As shown in FIG. 2 (b), a heat-resistant first packing 9 is interposed between the housing concave groove 13 a and the transparent plate 7, and between the transparent plate 7 and the lid member 8. The second packing 10 having heat resistance is interposed.

  In the second embodiment, instead of the transparent plate storage member 13, a closing plate 14 attached by the second auxiliary fastening member 12b so as to close the through hole 6a with respect to the outer surface of the closing flange 6 (FIG. 4). (A) and FIG. 4 (b)). The closing plate 14 is provided with a closing mounting hole 14a corresponding to the closing screw hole 6d.

  Next, the operation of the second embodiment will be described.

  The transparent plate 7 is inserted into the storage concave groove 13 a of the transparent plate storage member 13 through the first packing 9, and the transparent plate 7 is pressed by the lid member 8 through the second packing 10 to store the transparent plate storage member 13. The bolt 12aB of the first auxiliary fastening member 12a is inserted into the lid fastening hole 8b of the lid member 8 from the lid fixing hole 13e. When the nut 12aN is tightened to the bolt 12aB from the outer surface side of the lid member 8 in a state where the head of the bolt 12aB is accommodated in the large diameter groove portion 13f, the lid member 8 is fixed to the outer surface of the transparent plate housing member 13. .

  The cylindrical portion 13b of the transparent plate housing member 13 fitted with the transparent plate 7 and pressed by the lid member 8 is fitted into the through hole 6a of the closing flange 6, and the second auxiliary fastening member 12b is inserted from the housing fastening hole 13d. When the screw is screwed into the closing screw hole 6 d of the closing flange 6, the transparent plate housing member 13 is fixed to the closing flange 6.

  The closing flange 6 to which the transparent plate housing member 13 is fixed is fixed to the mounting seat 4 when the main fastening member 11 is inserted through the closing fastening hole 6 c and screwed into the mounting screw hole 4 a of the mounting seat 4.

  Thereby, in the second embodiment, unlike the conventional case, the transparent groove 7 is attached to the furnace 2 by the fastening member so that the transparent plate 7 is directly pressed by the closing flange 6. The transparent plate 7 that is inserted into the main plate 11 is not cracked when the main fastening member 11 is fastened.

  Further, since it is not necessary to increase or decrease the tightening force of the main fastening member 11 so that the transparent plate 7 is not broken, there is no fear of air flowing in or out of the viewing window 5.

  Incidentally, in the second embodiment, the transparent plate 7 is made of heat-resistant glass, and a heat-resistant first packing 9 is interposed between the concave groove 6b and the transparent plate 7, and the transparent plate Since the second packing 10 having heat resistance is interposed between the cover member 8 and the lid member 8, even if the temperature of the observation window 5 rises due to radiant heat transfer from the inside of the furnace 2, There is no particular problem. Thereby, the worker can monitor the state of flame of the burner and the state of adhesion of the clinker in the furnace 2 of the boiler 1 from the viewing window 5.

  Further, in the boiler 1, a large number of viewing windows 5 are arranged, and there are some places where monitoring is temporarily unnecessary. In this case, in the second embodiment, by loosening the second auxiliary fastening member 12b, the transparent plate housing member 13 can be easily removed and replaced with the closing plate 14. If the main fastening member 11 is loosened to remove the entire closing flange 6 and replace it with a closing plate 14 having a corresponding size, the main fastening member 11 is clearly shown in FIG. Compared with the second auxiliary fastening member 12b, the work of loosening and tightening takes time and effort. However, the second auxiliary fastening member 12b is smaller than the main fastening member 11, and the work of loosening and tightening can be performed relatively easily, and the replacement to the closing plate 14 is facilitated. Less burden is required.

  Thus, also in the second embodiment, the cracking of the transparent plate 7 at the time of tightening can be prevented and the inflow / outflow of air from the viewing window 5 can be prevented, so that the reliability, economy and maintenance can be improved.

  5 and 6 show a third embodiment of the viewing window according to the present invention. In the figure, the same reference numerals as those in FIGS. 2 and 3 denote the same parts, and the basic configuration is shown in FIG. 2 and the second embodiment shown in FIG.

  As shown in FIGS. 5 and 6, the first auxiliary fastening member 12a and the second auxiliary fastening member 12b are arranged so that their circumferential positions in the flange portion 13c are shifted as shown in FIGS. In addition, a notch 8c that avoids interference with the second auxiliary fastening member 12b is formed on the outer periphery of the lid member 8.

  Further, a purge hole 15 is formed in the cylindrical flange 13b of the closing flange 6 and the transparent plate housing member 13 so as to communicate in the radial direction, and the purge hole 15 is provided on the inner peripheral surface of the cylindrical portion 13b. Purge air is jetted.

  Next, the operation of the third embodiment will be described.

  The transparent plate 7 is inserted into the storage concave groove 13 a of the transparent plate storage member 13 through the first packing 9, and the transparent plate 7 is pressed by the lid member 8 through the second packing 10 to store the transparent plate storage member 13. The bolt 12aB of the first auxiliary fastening member 12a is inserted into the lid fastening hole 8b of the lid member 8 from the lid fixing hole 13e. When the nut 12aN is tightened to the bolt 12aB from the outer surface side of the lid member 8 in a state where the head of the bolt 12aB is accommodated in the large diameter groove portion 13f, the lid member 8 is fixed to the outer surface of the transparent plate housing member 13. . At this time, the notch portion 8c formed in the outer peripheral portion of the lid member 8 has a storage fastening hole in the circumferential direction of the flange portion 13c of the transparent plate storage member 13 as shown in FIGS. 5 (a) and 5 (c). It becomes the form arrange | positioned in the position corresponding to 13d.

  The cylindrical portion 13b of the transparent plate housing member 13 fitted with the transparent plate 7 and pressed by the lid member 8 is fitted into the through hole 6a of the closing flange 6, and the second auxiliary fastening member 12b is inserted from the housing fastening hole 13d. When the screw is screwed into the closing screw hole 6 d of the closing flange 6, the transparent plate housing member 13 is fixed to the closing flange 6. Here, the notch portion 8c prevents interference between the lid member 8 and the second auxiliary fastening member 12b.

  The closing flange 6 to which the transparent plate housing member 13 is fixed is fixed to the mounting seat 4 when the main fastening member 11 is inserted through the closing fastening hole 6 c and screwed into the mounting screw hole 4 a of the mounting seat 4.

  Thereby, also in the third embodiment, unlike the conventional case, unlike the conventional case, the transparent plate 7 is attached to the furnace 2 by the fastening member so that the transparent plate 7 is directly pressed by the closing flange 6. The transparent plate 7 that is inserted into the main plate 11 is not cracked when the main fastening member 11 is fastened.

  Further, since it is not necessary to increase or decrease the tightening force of the main fastening member 11 so that the transparent plate 7 is not broken, there is no fear of air flowing in or out of the viewing window 5.

  Incidentally, also in the third embodiment, the transparent plate 7 is heat-resistant glass, and a first packing 9 having heat resistance is interposed between the concave groove 6b and the transparent plate 7, and the transparent plate Since the second packing 10 having heat resistance is interposed between the cover member 8 and the lid member 8, even if the temperature of the observation window 5 rises due to radiant heat transfer from the inside of the furnace 2, There is no particular problem. Thereby, the worker can monitor the state of flame of the burner and the state of adhesion of the clinker in the furnace 2 of the boiler 1 from the viewing window 5.

  Further, in the boiler 1, a large number of viewing windows 5 are arranged, and there are some places where monitoring is temporarily unnecessary. In this case, also in the third embodiment, by loosening the second auxiliary fastening member 12b, the transparent plate housing member 13 can be easily removed and replaced with the closing plate 14 (see FIG. 4). If the main fastening member 11 is loosened to remove the entire closing flange 6 and replace it with a closing plate 14 of a corresponding size, the main fastening member 11 is shown in FIGS. As is clear from b), it is larger than the second auxiliary fastening member 12b, and the work of loosening and tightening takes time and effort. However, the second auxiliary fastening member 12b is smaller than the main fastening member 11, and the work of loosening and tightening can be performed relatively easily, and the replacement to the closing plate 14 is facilitated. Less burden is required.

  Furthermore, in the third embodiment, the first auxiliary fastening member 12a and the second auxiliary fastening member 12b are arranged so that the circumferential position of the flange portion 13c is shifted, and the outer peripheral portion of the lid member 8 is arranged. A notch 8c that avoids interference with the second auxiliary fastening member 12b is formed. For this reason, it becomes possible to increase visibility by increasing the inner diameter of the viewing hole 8a of the lid member 8.

  Further, in the boiler 1, ash may accumulate inside the cylindrical portion 13 b of the transparent plate housing member 13 in the viewing window 5. However, in the third embodiment, it is possible to prevent the volume of ash by injecting purge air from the purge hole 15 to the inner peripheral surface of the cylindrical portion 13b as necessary.

  Thus, also in the third embodiment, the cracking of the transparent plate 7 at the time of tightening can be prevented and the inflow / outflow of air from the viewing window 5 can be prevented, so that the reliability, economy and maintenance can be improved.

  In the first embodiment, the groove 6b is formed in the through hole 6a of the closing flange 6 and into which the transparent plate 7 is inserted. The groove 6b is interposed between the groove 6b and the transparent plate 7. A first packing 9 and a second packing 10 interposed between the transparent plate 7 and the lid member 8. The lid member 8 is connected to the outer surface of the closing flange 6 with the auxiliary fastening member 12. It is attached by. With this configuration, unlike the conventional case where the transparent plate 7 is attached to the furnace 2 by the fastening member so as to be directly pressed by the closing flange 6, cracking of the transparent plate 7 at the time of fastening of the main fastening member 11 occurs. Occurrence can be prevented. Further, since it is not necessary to adjust the tightening force of the main fastening member 11 so that the transparent plate 7 does not break, the inflow or outflow of air from the viewing window 5 can be prevented. Furthermore, the transparent plate 7 is made of heat-resistant glass, and the first packing 9 interposed between the concave groove 6b and the transparent plate 7 is interposed between the transparent plate 7 and the lid member 8. By making the second packing 10 into a packing having heat resistance, it is possible to cope with the temperature rise of the viewing window 5 due to radiant heat transfer from the inside of the furnace 2 in the boiler 1, and the monitoring can be performed smoothly.

  Further, in the second embodiment, a storage groove 13a for fitting the transparent plate 7 is formed in the inner peripheral portion, and a cylindrical portion 13b fitted into the through hole 6a of the closing flange 6; A transparent plate storage member 13 provided with a flange portion 13c projecting from the end of the cylindrical portion 13b to the outer periphery, and the lid member 8 is a transparent plate fitted in the storage groove 13a of the transparent plate storage member 13 7 is attached to the flange portion 13c so as to hold the member 7 down. The auxiliary fastening member 12 includes a first auxiliary fastening member 12 a for attaching the lid member 8 to the flange portion 13 c of the transparent plate housing member 13, and a flange portion 13 c of the transparent plate housing member 13 on the outer surface of the closing flange 6. A second auxiliary fastening member 12b to be attached, and a first packing 9 interposed between the housing groove 13a and the transparent plate 7, and interposed between the transparent plate 7 and the lid member 8. The second packing 10 is provided. With this configuration, unlike the conventional case, the transparent plate 7 is fitted into the storage groove 13 a of the transparent plate storage member 13, unlike the conventional case where the transparent plate 7 is attached to the furnace 2 by the fastening flange 6 so as to be directly pressed. The transparent plate 7 does not break when the main fastening member 11 is tightened. Further, it is not necessary to increase or decrease the tightening force of the main fastening member 11 so that the transparent plate 7 does not break, and the tightening force of the first auxiliary fastening member 12a and the second auxiliary fastening member 12b and the tightening force of the main fastening member 11 Can be appropriately managed, so that inflow or outflow of air from the viewing window 5 can be prevented. Furthermore, the transparent plate 7 is made of heat-resistant glass, and the first packing 9 interposed between the housing concave groove 13a and the transparent plate 7 is interposed between the transparent plate 7 and the lid member 8. By making the second packing 10 having heat resistance into the packing, it is possible to cope with the temperature rise of the viewing window 5 due to radiant heat transfer from the inside of the furnace 2 in the boiler 1 and to perform monitoring smoothly.

  Furthermore, in the third embodiment, the first auxiliary fastening member 12a and the second auxiliary fastening member 12b are disposed so that their circumferential positions are shifted in the flange portion 13c, and the lid member 8 is A notch 8c is provided to avoid interference with the second auxiliary fastening member 12b. If comprised in this way, the internal diameter of the observation hole 8a of the said cover member 8 can be increased, and visibility can be improved.

  Further, in the third embodiment, purge air is injected to the inner peripheral surface of the cylindrical portion 13b which is formed so as to communicate with the closing flange 6 and the cylindrical portion 13b of the transparent plate housing member 13 in the radial direction. Purge hole 15 is provided. If comprised in this way, when applied to the boiler 1, the volume of ash is injected by injecting purge air from the purge hole 15 to the inner peripheral surface of the cylindrical portion 13b of the transparent plate housing member 13 in the observation window 5 as necessary. Can be prevented.

  In the second embodiment and the third embodiment, the second auxiliary fastening member 12b is used to close the through hole 6a with respect to the outer surface of the closing flange 6 instead of the transparent plate housing member 13. A plate 14 is provided. With this configuration, when there is a viewing window 5 where monitoring is temporarily unnecessary, it is smaller than the main fastening member 11 and the work of loosening and tightening can be performed relatively easily. By loosening the two auxiliary fastening members 12b, the transparent plate housing member 13 can be easily removed and replaced with the closing plate 14.

  Note that the viewing window of the present invention is not limited to the above-described embodiment, and is applicable not only to a furnace of a boiler but also to a structure including structures, devices, and machinery that need to check the inside. Of course, various modifications can be made without departing from the scope of the present invention.

1 Boiler (structure)
2 Furnace (structure)
5 Viewing Window 6 Closing Flange 6a Through Hole 6b Groove 7 Transparent Plate 8 Lid Member 9 First Packing 10 Second Packing 11 Main Fastening Member 12 Auxiliary Fastening Member 12a First Auxiliary Fastening Member 12b Second Auxiliary Fastening Member 13 Transparent Plate Storage Member 13a Storage groove 13b Tubular portion 13c Flange portion 14 Closing plate 15 Purge hole

Claims (6)

Attach a closing flange fitted with a transparent plate to the structure, and check the inside of the structure.
A main fastening member for fixing the closing flange;
A lid member for holding the transparent plate;
A viewing window provided with an auxiliary fastening member for fixing the lid member. A concave groove formed in the through hole of the closing flange and into which the transparent plate is inserted;
A first packing interposed between the concave groove and the transparent plate;
A second packing interposed between the transparent plate and the lid member,
The viewing window according to claim 1, wherein the lid member is attached to the outer surface of the closing flange by the auxiliary fastening member. A storage groove for fitting the transparent plate is formed in the inner peripheral portion, and a cylindrical portion that is inserted into the through hole of the closing flange, and a flange portion that projects from the end of the cylindrical portion to the outer periphery. A transparent plate storage member provided,
The lid member is attached to the flange portion so as to press the transparent plate fitted in the storage concave groove of the transparent plate storage member,
The auxiliary fastening member includes a first auxiliary fastening member that attaches the lid member to the flange portion of the transparent plate housing member, and a second auxiliary fastening member that attaches the flange portion of the transparent plate housing member to the outer surface of the closing flange. Prepared,
A first packing interposed between the housing concave groove and the transparent plate;
The viewing window according to claim 1, further comprising: a second packing interposed between the transparent plate and the lid member. The first auxiliary fastening member and the second auxiliary fastening member are disposed so that a circumferential position of the flange portion is shifted,
The sight glass according to claim 3 with which said lid member was provided with a notch which avoids interference with said 2nd auxiliary fastening member.   5. The peeper according to claim 3, further comprising a purge hole that is formed so as to communicate in a radial direction with the cylindrical portion of the closing flange and the transparent plate housing member and that injects purge air to the inner peripheral surface of the cylindrical portion. window.   The peeping according to any one of claims 3 to 5, further comprising a closing plate attached by the second auxiliary fastening member so as to close the through hole with respect to an outer surface of the closing flange instead of the transparent plate housing member. window.

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