JPH08598Y2 - Peep tube used for pulverized coal carrier pipe device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a peep tube capable of confirming a flow of fine powder in a pulverized coal carrier pipe apparatus.

[Prior Art] Among the coal combustion methods in a boiler, a pulverized coal combustion method that is generally widely used is a method in which fine coal powder is mixed with primary air and ejected from a burner to perform floating combustion. In order to realize stable combustion depending on the load on the boiler, it was necessary to observe the pulverized coal powder flow in the pulverized coal pipe communicating with the burner.

[Problems to be Solved by the Invention] However, there is a problem in that the conventional pulverized coal transport pipe device does not have a good means for observing the fine powder flow in the pipe.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a peep tube having a peep window capable of observing a fine powder flow in the pulverized coal conveying pipe device.

[Means for Solving the Problem] The present invention is a transparent tube having an inner diameter that is in contact with the outer circumference of a short tube that is formed of an elastic material and that has at least one or more viewing windows in the middle portion in the longitudinal direction of the tube. The tube is rotatably fitted to the outside,
Further, a flange plate for fixedly holding the short tube and rotatably holding the end portion of the transparent tube is arranged at both ends of the transparent tube.

[Operation] Therefore, in the present invention, by observing the inside of the short pipe through the viewing window provided in the short pipe across the transparent pipe, the pulverized coal flow in the pulverized coal pipe passing through the short pipe is observed, and the pulverized coal on the inner surface of the transparent pipe is observed. When it becomes difficult to see through the short tube through the viewing window, the transparent tube is manually rotated to scrape off the pulverized coal adhering to the inner surface of the transparent tube at the edge of the viewing window. ,
The fine powder flow in the short pipe can be seen well.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 and FIG. 2 show an embodiment of the present invention, which comprises a main body 1a formed of a spring steel thin plate in a tubular shape, and a small-width flange 1b along the outer circumference of both ends of the main body 1a and orthogonal to the main body 1a. A short tube 1 having a predetermined length is used, and a viewing window 2 of a required size is provided on the circumferential surface of the main body 1a at an intermediate portion in the longitudinal direction of the short tube 1. Then, slits 3 extending laterally along the circumference of the main body 1a from both ends of the upper and lower edges 2a of the viewing window 2 are provided, and both side edges 2b of the viewing window separated from the upper and lower edges 2a of the viewing window 2 by the slits 3. The pushing force is exerted toward the outer side in the radial direction of the main body 1a by the elastic force generated by the material of the short tube 1 at the portion.

A transparent tube 4 formed of transparent Pyrex glass and having an inner diameter in contact with the outer periphery of the body 1a of the short tube 1 and a length slightly shorter than the short tube 1 is externally fitted to the short tube body 1a.

Further, the transparent tube 4 has a disk shape having a predetermined outer diameter and a thickness, and has a through hole 5 in the center through which the main body 1a of the short tube 1 can be inserted and fixed, and concentric with the through hole 5. The circular groove 6 has a circular groove 6 having an inner diameter and a predetermined depth that can be externally fitted to the end portion, and a chamfered portion 7 into which an O-ring 15 can be inserted at a corner of the inner circumference of the circular groove 6. A plurality of tap holes 8 for mounting an O-ring holding plate 13 to be described later are provided on the outside of the above, and two flange plates 10 having a plurality of flange mounting bolt holes 9 on the outside of the tap holes 8 are used. , The through hole 5 of the flange plate 10 to the flange 1b
The flange plate 10 is provided so as to be fitted onto the portion of the short tube body 1a which is in contact with the outer circumference of the transparent tube 4, and the circular groove 6 is fitted onto both ends of the transparent tube 4.

Furthermore, a through hole loosely circumscribing the main body 1a of the short pipe 1.
An O-ring holding plate 13 having a bolt hole 12 arranged so as to fit in the tap hole 8 of the flange plate 10 is used, and the O-ring holding plate 13 is inserted into the tap hole 8 with a screw 14. By doing so, the flange plate circular groove 6 in which the O-ring 15 is inserted is mounted so as to cover the circular groove 6. In the figure, 16 indicated by a two-dot chain line indicates a pulverized coal pipe, and 17 indicates a piping flange. Further, 18 is for preventing air leakage by being sandwiched between the pipe flange 17 and the flange plate 10 when inserting and connecting the sight pipe used for the pulverized coal pipe to the pipe flange 17 part in the middle of the pipe of the pulverized coal pipe 16. It is a rubber packing.

Insert the sight pipe of the present invention configured as described above with the rubber packing 18 between the flanges 17 in the middle of the pulverized coal pipe 16,
By inserting bolts into the pipe flange 17 and the bolt holes 9 of the flange plate 10, the pulverized coal pipe 16 is connected in the middle of the pipe.

Thus, the inside of the short pipe 1 is seen through the viewing window 2 of the short pipe 1 across the transparent pipe 4, and the pulverized coal pipe 16 that passes through the short pipe 1
Observe the fine powder flow inside.

Pulverized coal adheres to the inner surface of the transparent tube 4, and the short tube 1
When it becomes difficult to see through the inside, the transparent tube 4 is manually rotated along the outer circumference of the short tube 1.
Both side edges 2b of the viewing window 2 in contact with the inner surface scrape off pulverized coal adhering to the inner surface of the transparent tube 4 to clear the inner surface of the transparent tube 4.

According to the above, since the transparent tube 4 is formed so that the inside of the tube can be seen through the viewing window 2, the pulverized coal flow in the pulverized coal tube can be observed at all times, and the transparent tube 4 can be rotated. By rotating the transparent tube 4, dirt on the inner surface of the transparent tube 4 can be wiped off by both side edges 2b of the viewing window 2, and the clear viewing window 2 can be always maintained.

It should be noted that the present invention is not limited to the above-described embodiment, and for example, in the drawings, the case where the slits 3 are provided at the upper and lower edges 2a of the viewing window 2 has been described. A crack may be provided along the ridge so that a pressing force is exerted on the entire short tube 1 toward the inner peripheral surface of the transparent tube 4 by the crack, and a plurality of viewing windows may be provided. It is needless to say that any material other than spring steel may be used as long as it has a required elastic force as the material, and other various changes can be made without departing from the scope of the invention. .

[Advantages of the Invention] As described above, according to the sight tube of the present invention, various excellent effects as described below can be obtained.

I) A transparent tube is externally fitted to a short tube made of a material having a required elastic force and provided with a viewing window so that the transparent tube can be rotated in a state where the short tube is in contact with the inner peripheral surface of the transparent tube. Therefore, when pulverized coal adheres to the inner surface of the transparent tube and it becomes difficult to see the inside of the short tube through the viewing window, the transparent tube is rotated to scrape dirt off the inner surface of the viewing tube at both edges of the viewing window. Therefore, it is possible to maintain a state in which the inside of the short tube can be well seen through at any time.

II) Since flange plates were placed at both ends of the combined short pipe and perspective pipe, if a flange portion is provided in the pipe of the pulverized coal transfer pipe device, it can be installed anywhere in the pulverized coal transfer pipe. it can.

III) Since the inside of the tube is seen through the viewing window that separates the transparent tube, it becomes possible to always observe the fine powder flow in the pulverized coal tube without requiring special steps when looking inside the tube.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of a peeping pipe used in a pulverized coal conveying pipe device of the present invention, and FIG. 2 is a mounting state diagram of the peeping pipe shown in FIG. In the figure, 1 is a short tube, 2 is a viewing window, 4 is a transparent tube, 5 is a through hole, 6
Is a circular groove, 9 is a bolt hole, and 10 is a flange plate.

Claims (1)

[Scope of utility model registration request] 1. A transparent tube having an inner diameter in contact with the outer circumference of the short tube is rotatably fitted on a short tube formed of an elastic material and having at least one or more viewing windows at an intermediate portion in the longitudinal direction of the tube. Then
Further, a flange plate for fixedly holding the short pipe and rotatably holding the end portion of the transparent pipe is provided at both ends of the transparent pipe, and is used in a pulverized coal conveying pipe device. tube.