JPH064725U - Heat resistant pressure resistant fiberscope - Google Patents

Abstract

(57) [Summary] [Purpose] Improves the safety against outflow of observation atmosphere fluid at high temperature and high pressure, and facilitates manufacturing.
Allow reuse. [Structure] Outer tube 1 having pressure-resistant transparent optical windows 11 and 12
Inside, the light guide portion 2 and the image fiber portion 3 which are put in the protective tube are arranged, and the transparent window is used as the first pressure partition wall portion. The metal block 41, which penetrates and seals the light guide portion 2 and the image fiber portion 3, is screwed into the partition wall 13 in the outer tube 1, and the hollow bolt 42 is screwed into the cap nut 45.
The second pressure partition wall portion 4 by tightening with
The metal block 41 having the light guide portion 2 and the image fiber portion 3 can be removed from the outer tube 1 by loosening the cap nut 45 to release the fixation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a heat and pressure resistant fiberscope used for observing the behavior of fluid inside a boiler or the like under high temperature and high pressure.

[0002]

[Prior art]

 Conventionally, when observing the behavior of a fluid under high temperature and high pressure inside a boiler, for example, a periscope or an industrial fiberscope, which is premised to be used at room temperature, is used for forced cooling.

[0003]

[Problems to be solved by the device]

 However, conventionally, since a fiberscope for room temperature is used, there is not only a problem in heat resistance and pressure resistance, but also a problem that the device becomes large because a forced cooling device is required.

In view of the above, the present invention improves heat resistance and pressure resistance without requiring a forced cooling device, improves the safety against outflow of the observation atmosphere fluid, and further facilitates manufacturing. The purpose of the present invention is to provide a heat and pressure resistant fiberscope that takes into consideration the properties and the possibility of reuse (recycling).

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, in the heat resistant and pressure resistant fiberscope according to the present invention, a protective tube having an image transmitting image fiber inserted in an outer tube having a pressure resistant transparent optical window and an optical fiber transmitting light for illumination are inserted. The pressure-resistant transparent optical window is used as the first pressure partition wall portion. The protection tube is sealed to the metal block while penetrating the metal block, and the metal block is detachably sealed inside the outer tube by the caulking fixing mechanism. In this way, the metal block is sealed inside the outer tube to form the second pressure partition wall portion.

[0006]

[Action]

 The optical window and image fiber for image transmission enable observation of high temperature and high pressure fluid outside the outer tube. The first and second pressure barriers block the observed high-temperature and high-pressure fluid, thus improving safety. The second pressure partition wall portion is formed by caulking and fixing the metal block inside the outer tube, and the caulking fixing mechanism is detachable, so the metal block can be removed from the outer tube. Therefore, after assembling the protective tube through the metal block for sealing and inserting the image fiber into the protective tube outside the outer tube, the metal block can be caulked and fixed in the outer tube. , Easy to manufacture. When the image fiber is destroyed, the metal block can be removed from the outer tube and replaced with a new one to reuse the outer tube.

[0007]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an entire embodiment of the present invention. As shown in FIG. 1, a light guide portion 2 and an image are provided in a cylindrical pipe-shaped outer tube 1 made of a metal having excellent heat resistance and pressure resistance. The fiber unit 3 is housed therein. Two openings are provided at the tip (right end in the figure) of the outer tube 1, and pressure-resistant transparent optical windows 11 and 12 are sealed to each of them by brazing. These optical windows 11 and 12 are made of a transparent and hard material such as quartz glass or sapphire. These optical windows 11 and 12 hermetically close the tip of the outer tube 1 to prevent the high temperature and high pressure fluid of the observation atmosphere from entering the inside even when the outer tube 1 is inserted into the observation environment of high temperature and high pressure. It functions as a first pressure barrier to prevent.

The material of the outer tube 1 may be an ordinary metal material such as steel, stainless steel, or a copper alloy, but has a small difference in coefficient of thermal expansion from the optical material such as glass forming the optical windows 11 and 12. Metallic materials, such as Kovar, are suitable. Further, although the outer tube 1 has a cylindrical pipe shape as described above in this embodiment, the outer tube 1 is not limited to this and may have any shape such as a rectangular tube shape. It can be used.

The light guide portion 2 and the image fiber portion 3 inside the outer tube 1 are inserted into and held by a metal block 41 which constitutes the second pressure partition wall portion 4. The metal block 41 is sealed by fastening a cap nut 45 to a hollow bolt 42 screwed into the partition wall 13 of the outer tube 1. The light guide portion 2 has a light projecting lens portion 21 attached to the front end thereof, and an optical fiber bundle 22 connected to the rear end thereof. An objective lens portion 31 is attached to the front end of the image fiber portion 3, and an eyepiece lens portion 32 is attached to the rear end thereof.

As shown in FIG. 2A, the light guide section 2 includes a heat-resistant light guide optical fiber 20 and a protective pipe 23. The optical fiber 20 is inserted into the protection pipe 23 and protected. A light projecting lens portion 21 for projecting the light transmitted through the light guide optical fiber 20 is attached to the tip of the protective pipe 23 via a base 27. The illumination light is made incident on the rear end of the optical fiber 20 by the optical fiber bundle 22.

The protective pipe 23 is divided into a front (right) side and a rear (left) side, and a pressure boundary sleeve 26 is arranged in the vicinity of the joint between the two divided pipes 24 and 25. Grooves are formed on the inner peripheral surfaces of the pipes 24 and 25 for fitting the sleeve 26 into the pipes 24 and 25. The two pipes 24 and 25 are butted against each other while the sleeve 26 is fitted in the groove, and these pipes are sealed with a heat-resistant adhesive or brazing. The inner surface side of the sleeve 26 is in close contact with the outer peripheral surface of the light guide optical fiber 20. The protective pipes 24, 25, the sleeve 26, the base 27, and the exterior of the light projecting lens portion 21 are preferably made of a metal material having a coefficient of thermal expansion close to that of glass, such as Kovar.

Since the sleeve 26 is fitted and sealed in the groove in the protective pipe 23, the sleeve 26 functions as a pressure partition in the protective pipe 23, and the tip of the protective pipe 23 is damaged by any chance. In this case, the high temperature and high pressure fluid does not cause the sleeve 26 to retract backward, and it is possible to prevent the fluid from leaking to the outside through the protection pipe 23.

The image fiber unit 3 has the same structure as the light guide unit 2. As shown in FIG. 2B, the heat resistant image transmission image fiber 30 and the protective pipe 33 for covering and protecting the image fiber 30. Consists of. An objective lens section 31 is attached to the tip of the protective pipe 33 via a base 37, and an eyepiece lens section 32 is joined to the rear end. The image fiber 30 is heat-resistant, and its resin coating is removed to prevent burning at high temperatures, and a base 37 is bonded to the tip thereof with a heat-resistant adhesive.

The protective pipe 33 of the image fiber portion 3 is divided into a front (right) side and a rear (left) side, and a pressure boundary sleeve is provided near the joint between the two divided pipes 34 and 35. 36 are arranged. Grooves are formed on the inner peripheral surfaces of the pipes 34 and 35 for fitting the sleeve 36 into the pipes 34 and 35. The two pipes 34 and 35 are butted against each other with the sleeve 36 fitted in the groove, and these are sealed by a heat-resistant adhesive or brazing. The inner surface side of the sleeve 36 is in close contact with the outer peripheral surface of the image fiber 30. The protective pipes 34, 35, the sleeve 36, the base 37, and the exterior of the light projecting lens unit 31 are preferably made of a metal material having a coefficient of thermal expansion close to that of glass, such as Kovar.

Since the sleeve 36 is thus fitted and sealed in the groove portion in the protective pipe 33, the sleeve 36 functions as a pressure partition wall in the protective pipe 33, and the tip of the protective pipe 33 is damaged. At this time, the high-temperature and high-pressure fluid does not cause the sleeve 36 to retract backward, and the fluid can be prevented from leaking out through the protection pipe 33.

The second pressure partition wall portion 4 is configured as shown in FIG. In FIG. 3, the protection pipe 23 of the light guide portion 2 and the protection pipe 33 of the image fiber portion 3 penetrate through the columnar metal block 41. In this state, the pipes 23, 33 are the metal block 41. It is sealed with adhesive or heat resistant adhesive. On the other hand, a taper screw (male screw) 43 of a hollow bolt 42 is screwed into a through hole provided in the partition wall 13 of the exterior pipe 1, and the hollow bolt 42 is fixed to the partition wall 13. The hollow bolt 42 also has a male screw 44 on the left end side, and the bag nut 45 is fitted to the male screw 44. The sealing ferrules 46 and 47 are loosely fitted to the metal block 41 near the left end of the hollow bolt 42. Each of the sealing ferrules 46 and 47 is a ring type, and the outer peripheral surface thereof has a taper shape (wedge shape) which becomes thinner toward the right end. The metal block 41, the hollow bolt 42, the cap nut 45, and the sealing ferrules 46 and 47 can be formed of various metal materials, but it is preferable that they are formed of the same metal material as the outer tube 1.

After fixing the hollow bolt 42 by screwing it into the through hole of the partition wall 13 in the exterior pipe 1, the metal block 41 is inserted into the hollow portion of the hollow bolt 42. Next, the sealing ferrules 46 and 47 are inserted from the left side of the metal block 41, the cap nut 45 is further inserted, and the cap nut 45 is fitted to the male screw 44 of the hollow bolt 42. As the cap nut 45 is tightened, the ferrules 46 and 47 are pushed toward the hollow bolt 42 side, and the wedge-shaped right end of the ferrule 47 is pushed between the hollow bolt 42 and the metal block 41, and the ferrule 46 The right end of the wedge shape fits tightly between the ferrule 47 and the metal block 41. In this way, the metal block 41 is caulked and crimped to the hollow bolt 42 in an airtight manner. Further, since the hollow bolt 42 itself is screwed around the partition wall 13 of the outer tube 1 in a state in which a sealing material or the like is wound, it is airtightly fixed. Therefore, by these, the metal block 41 is caulked and crimped inside the outer tube 1 in an airtight manner. It can function as the second pressure partition wall portion 4 for blocking and ensuring safety.

In the heat and pressure resistant fiberscope having such a configuration, the light from the optical fiber bundle 22 is irradiated to the observation target through the light guide section 2, the light projecting lens section 21 and the optical window 11, and the image thereof is optically reflected. It is taken into the image fiber unit 3 through the window 12 and the objective lens unit 31, and is transmitted to the eyepiece lens unit 32 by the image fiber 30. In this way, the high-temperature and high-pressure fluid to be observed is observed with the naked eye or a television camera in the eyepiece lens unit 32.

Since the image transmission image fiber 30 and the like housed in the outer tube 1 are heat-resistant to withstand use at high temperatures, a cooler or the like for forcibly cooling the outer tube 1 is unnecessary, The outer tube 1 can be miniaturized, and it becomes possible to observe while turbulence of the observation fluid when inserting the outer tube 1 into the observation atmosphere is minimized.

In addition, since the optical windows 11 and 12 provided in the outer tube 1 are used as the first pressure partition wall and the second pressure partition wall portion 4 is formed by the metal block 41 or the like, a double structure is formed. Therefore, even if the first pressure bulkhead is damaged, the second pressure bulkhead part 4 can prevent the high-temperature, high-pressure fluid from leaking to the outside through the inside of the exterior pipe 1, thus enhancing the safety. be able to.

Further, since the pressure partition wall portion 4 is configured to be removably caulked and fixed to the metal block 41 so as to be sealed inside the outer tube 1, if the cap nut 45 is loosened, the ferrules 46 and 47 are released. The bite is released and the metal block 41 can be removed from the hollow bolt 42. As a result, the metal block 41 can be taken out of the outer tube 1. Therefore, when the light guide optical fiber 20, the image transmitting image fiber 30 or the like is damaged by vibration or the like, they can be easily removed together with the metal block 41. It is also possible to replace it with a new one and fix it again in the outer tube 1. Since the outer pipe 1 can be reused in this manner, it also contributes to resource recycling and is highly economical. Further, the work of assembling the light guide portion 2 and the image fiber portion 3 and attaching them to the metal block 41 is performed outside the outer tube 1, and then the work of fixing the metal block 41 in the outer tube 1 is performed. As a result, the assembling workability is improved, and the device can be easily manufactured.

[0022]

[Effect of device]

 As explained above, according to the heat and pressure resistant fiberscope of the present invention, it is possible to safely observe the high temperature and high pressure fluid in the boiler, which is the object of observation, and it is possible to reduce the size because a forced cooler is unnecessary. . Furthermore, it has good assembly workability, is easy to manufacture, and contributes to resource recycling.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a light guide portion and an image fiber portion of the same embodiment.

FIG. 3 is a sectional view of a pressure partition wall portion of the same embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exterior tube 2 Light guide part 3 Image fiber part 4 Pressure partition wall part 11, 12 Pressure resistant transparent optical window 13 Partition wall 20 Light guide optical fiber 21 Light projecting lens part 22 Optical fiber bundle 23, 33 Protective pipe 26, 36 Sleeve 27 , 37 Base 30 Image transmission image fiber 31 Objective lens part 32 Eyepiece part 41 Metal block 42 Hollow bolt 43 Tapered screw 44 Male screw 45 Cap nut 46, 47 Sealing ferrule

Claims (1)

[Scope of utility model registration request] 1. An exterior tube, a pressure-resistant transparent optical window sealed to an opening provided at a tip of the exterior tube to form a first pressure partition wall portion, and arranged in the exterior tube for image transmission. A protective tube containing an image fiber, a protective tube into which an optical fiber for transmitting light for illumination is inserted, a metal block into which these protective tubes are inserted and sealed, and the metal block to the exterior tube. A heat-resistant pressure-resistant fiberscope, comprising a caulking fixing mechanism for removably caulking and fixing the inside of the metal block to seal the metal block inside the outer tube to form a second pressure partition wall portion.