JPS5816196A - Jig for removing matter stuck to inside of branch pipes - Google Patents

Abstract

PURPOSE:To remove the matter stuck to the inside of the respective branch pipes in a short time without additionally providing flange parts or the like by a method wherein the titled jig is attached to the open end of a branch base pipe in order to flow fluid added with abrasives through branch pipes in series. CONSTITUTION:In the jig for removing the matter stuck to the inside of the branch piping, which is detachably attached to the open end of the branch base pipe 13 communicating to each one side of a plurality of the branch pipes 14A and 14B connected in parallel thereto, a basic body 22 with a communicating port 26 communicating to the base pipe 13 is detachably attached at the open end of the base pipe 13. A tubular inserting pipe 30, which is inserted into the base pipe 13 and the tip opening of the bend 34 of which is fixed to one end of either the pipe 14A or the pipe 14B by pressure by means of a pressure-fitting mechanism 33, is provided in the base body 22. As a result, the flow passage, through which nitrogen gas added with abrasives flows, is formed through the pipes 14A and 14B in series, resulting in enabling to remove the matter stuck to the inside of the branch pipes in a short time without conventional additional provision of flange parts to the existing branch piping.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method used to remove deposits generated in branch piping installed in a heating furnace, for example, by using a fluid mixed with polishing materials. be.

In general, in heating furnaces, that is, equipment that has a large number of heating tubes installed in the furnace and completely heats the fluid flowing through the heating tubes by burning fuel with a burner, carbon, etc. are generated in the heating tubes when operated for a long time. . When carbon and the like are generated, the conductivity of the tube deteriorates and the surface temperature of the tube rises, eventually making it impossible to operate.

On the other hand, there is a method called a so-called sand jet cleaning method as a method for removing carbon and the like generated inside the pipe. This is nitrogen gas mixed with abrasive material such as sand at 80 m/sec ~ 10
When fed into a pipe at a high speed of 0 m/sea, nitrogen gas and abrasive material flow in a spiral turbulent flow inside the pipe, and in the process, the abrasive material hits the inner wall surface of the pipe at an acute angle, causing deposits inside the pipe to be removed. This is how it is removed.

However, although this method has an excellent removal effect in the case of a single tube, it has a drawback in the case of a heating tube installed in a heating furnace, etc.1. In the case of heating tubes that are This is because only one heating tube with low resistance flows, and the amount of nitrogen gas flowing into the other heating tube decreases, making it impossible to remove deposits formed on multiple heating tubes at the same time.

Therefore, conventionally, as shown in FIG. 1, for example, each heating tube 2A, 2B has flanges P, Q, at both ends, respectively.
R and S were provided, and the processing of one heating tube 2A was performed with the flange portions R and Si closed, and the processing of the other heating tube 2A was performed with the flange portions P and Q closed, respectively.

Therefore, since each heating tube is treated individually, the working time is inevitably long.''-1 The problem associated with the increased working time was that it required a lot of nitrogen gas and abrasive material. .

An object of the present invention is to provide a complete jig for removing deposits inside pipes in branch pipes that can be routed, reducing the working time without adding additional flanges or the like.

The present invention has a configuration in which a hollow cylindrical insertion tube is provided on a base body having a discharge port, and a crimping machine jm is provided for energizing the tip opening of this insertion tube, and a branch base tube common to parallel branch tubes is provided. The base at the open [] end? In addition to being removably installed,
After insertion into the branch tube, 7CJtl + Immigration tube is inserted into the branch tube, the 11 portion between the distal ends of the insertion tube is urged toward the branch portion of the branch tube using the crimping mechanism, and fluid such as nitrogen gas mixed with sacroiliac I is inserted into the branch tube. The purpose is to achieve all of the above objectives by forming all flow channels that flow in a loop shape, that is, in series.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 2 to 5.

FIG. 2 shows the structure of the heating furnace. Inside the heating furnace 11, heating pipes 14A and 14B as a pair of branch pipes are arranged in parallel with each other and in a meandering state. One ends of the double-door heat pipes 14A and 14B are connected to the introduction pipe 12 via a common branch base pipe 13. Further, the other ends of the double-door heat pipes 14A and 14B are connected to each other and connected to the outlet pipe 15. Outlet pipe 15
A flange portion 17 is formed in the middle of the outlet pipe 15, into which a shielding plate 16e for blocking the flow within the outlet pipe 15 is inserted.

Additionally, flanges 18A and 18B are provided at both open ends of the branch base pipe 13, and a sealing plate 19A is detachably attached to the flanges 18A and 18B.
, 19B is not installed. When the heating furnace 11 is in operation, its sealing plates 19A and 19B keep the branch base pipe 13 open in both directions.
Although the end is in a closed state, when removing all the deposits that have formed inside the pipe, either one of the sealing plates 19A and 19B is removed, and the jig 21 is inserted from the end of the gap between the two to remove all the deposits that have formed inside the pipe.
inserted inside.

FIGS. 3 and 4 show the state I when the jig 21 is inserted into the branch base pipe 13! T! FIG. 5 is a perspective view of the jig 21. The jig 21 is connected to the branch base pipe 13.
has a base body 22 (i=attached to either end of the flange 18A, for example, the flange 18A).

The base body 22 includes a cylindrical base tube 23 having a diameter larger than the inner diameter of the branch base tube 13 and having an open end, and is integrally fixed to the edge of the open end of the base tube 23 and bolted to the seven flange 18A. The mounting port 26 is integrally fixed with a nut 24, and a support ring 28 having a plurality of tightening bolts 27 at the center is provided on the end face, and through holes 29 are provided above and below the support ring 28, respectively. The support ring 2B has
An insertion tube 30 inserted into the branch base tube 13 is inserted so as to be movable and fixed by the tightening bolt 27. Further, a guide tube 32 having a threaded portion 31 formed on the outer periphery of the tip is fixed to the outer surface of the through hole 29, and a crimping mechanism for tightening the tip of the insertion tube 30 in one direction through the entire guide tube 32. 33 are provided.

The insertion tube 30 has a hollow cylindrical shape with a diameter smaller than the inner diameter of the branch base tube 13 and approximately equal to the inner diameter of the heating tubes 14A and 14B, and the tip thereof is slightly bent toward one side. The bent portion 34 has a curved surface that matches the inner surface of the branch tube 13 along the opening edge, and has a rubber gasket 35A' on the outer surface. A pressure bonding plate 35 having a t-shape is fixed, and a guide ring 36 is provided which rolls over the entire inner wall surface of the branch base pipe 13 in the upper and lower sides. Further, a flange 37 is fixed to the proximal end of the insertion tube 30, and is further slidably fitted to the support ring 28 at a predetermined position in the longitudinal direction of the insertion tube 30, and is tightened by the tightening bolt 27. The sliding tubes 38 and 39 to be held are each fixed. That is, the flange 25 of the base body 22 is attached to the 7 flange 18A of the branch base pipe 13.
is attached and the tips of the insertion tubes 30 are positioned at the branching portions of the heating tubes 14A and 14B, respectively, and the sliding tubes 39 and 38 are respectively fixed at positions corresponding to the support ring 28 in each state. .

The crimping mechanism 33 includes a pair of connecting rods 41 that are arranged parallel to each other on both sides of the insertion tube 30 and whose proximal ends protrude outside through the guide tube 32f, and a pin 42 between the distal ends of the pair of connecting rods 41. The biasing arm 43 is rotatably connected at approximately the center via the biasing arm 43. Biasing arm 4
3 has one end rotatably connected via a pin 45 to a protruding piece 44 protruding from the bent portion 34 of the insertion tube 30, and a roller 46 abutting against the inner wall of the branch base tube 13 at the other end. have. -! Further, a threaded portion 4T is formed on the proximal end side of the pair of coupling tips 41, and a nut 48 is screwed into a portion of the threaded portion 47 that protrudes from the guide tube 32. Furthermore, the protruding end to which the nut 4B is screwed comes into contact with the inner end surface of the cap 49 when the cap 49 is screwed onto the threaded portion 31 of the guide tube 32.

Next, the working method of this embodiment will be explained.

Normally, when the heating furnace 11 is in operation, both open ends of the branch base pipe 13 are closed by sealing plates 198 and 19B, and the shielding plate 16 of the flange portion 17 is removed. Therefore, the fluid to be heated supplied from the introduction pipe 12 is transferred from the branch base pipe 13 to the heating pipes 14A and 14B, respectively, at the branch part and from the pipe 1 to the heating pipe 14B.
Flows to 5. Then, the fluid to be heated is heated in the heating furnace 11 in the process of flowing through the heating tubes 14A and 14B'.

On the other hand, when removing deposits generated in the fluid passages, particularly in the heating tubes 14A and 14B during operation of the heating furnace 11, first insert the shielding plate 16 into the flange portion 17, and then insert the shielding plate 16 into the flange portion 17. One sealing plate of the tube 13, for example the sealing plate 198'fc at the left end in FIG. 2, is removed, and the insertion tube 30 of the jig 21 is inserted into the branch base tube 13 from its open end. At this time, as shown in FIG. 6, the nut 48 screwed onto the connecting rod 41
Loosen the connecting rod 41, push the connecting rod 41 to the right in the figure to tilt the biasing arm 43, and then insert the cap 49 into the threaded portion 31 of the guide tube 32 in a screwed state.

As a result, once the open end of the bent portion 34 of the insertion tube 30 is approximately located at the branch portion of the heating tube 14B, the flange 25 of the base body 22 is temporarily fixed to the flange 18A of the branch base tube 13 with bolts and nuts 24. Next, the nut 48 screwing the cap 49 onto the outer 1-1 connecting rod 41 is tightened. Then, as shown in FIG. 4, as the connecting rod 41 retreats, the biasing arm 43 rotates clockwise in the figure using the pin 45 at one end as a fulcrum, and the roller 46 at the other end moves toward the branch base pipe 13. It will be in a state where the inner wall is pressed. As a result, the open end of the bent portion 34 of the insertion tube 30 is pushed into the branch portion of the heating tube 14B, and the pressure bonding plate 35 is crimped to the periphery of the branch portion of the heating tube 14B. Finally, bolts and nuts 24 are tightened to firmly fix the seventh flange 25 to the seventh flange 18A. With the above steps, setting of the jig 21 is completed.

Therefore, after all the dust collectors are connected to the discharge port 26, the insertion pipe 30
Nitrogen gas mixed with sand or other abrasive material is fed in from the base end at high speed. The nitrogen gas sent into the insertion tube 30 is passed through the heating tubes 14A and 14B, the branch base tube 13, and the outlet 26.
, flows in series with the path of the dust collector, that is, the heating tubes 14B and 14A. Then, the nitrogen gas and the abrasive material flow in a spiral turbulent flow within each tube, and the deposits inside the tubes are removed by the action of the 4111M material.

According to the embodiment described above, the insertion tube 30 is inserted into the branch base tube 13 from the first open end of the branch base tube 13, and the distal end opening of the insertion tube 30 is connected to either of the heating tubes 14A, 14B. Once crimped, the nitrogen gas heating tube 14 containing all the abrasive material is heated.
Since each stream can be formed to flow in series with A and 14B, deposits in the branch pipe can be removed in a short time without adding flanges etc. to the existing branch pipe as in the conventional case. In addition, consumption of nitrogen gas, etc. can be reduced.

Furthermore, when inserting the insertion tube 30 into the branch base tube 13, a guide ring 36 that rolls on the inner wall surface of the branch base tube 13 is provided at the distal end of the insertion tube 30, so that the insertion operation is facilitated. can be done. At that time, the connecting rod 41 is pushed in so that the biasing arm 43 is in a state that does not interfere with insertion.
Since a cap 49 is provided to prevent the connecting rod 41 from returning, the biasing arm 43 can be held in that state, and the support rings 28 can be attached at two longitudinal positions of the insertion tube 30.
Since the sliding tubes 38 and 39 are slidably fitted to the insertion tube 30, the tip opening of the insertion tube 30 can be connected to any heating tube 14
It can be crimped onto the branching parts of A and 14B. Moreover, since the longitudinal position of the insertion tube 30 can be adjusted within the range of the sliding distance 38.39, the distal end opening of the insertion tube 30 can be adjusted to any heating tube 148.

It is possible to accurately and reliably attach the FIE to the branch part of 14B.

Note that the present invention is not limited to the piping of the heating furnace 11 described in each of the embodiments above, but can be applied to any piping structure as long as it has a branch piping structure. Further, the fluid mixed with the abrasive material is not limited to the nitrogen gas described in the Kamiya example. Further, in the above embodiment, the base body 22 was provided with the discharge port 26 as a communication port via the base cylinder 23, but the base body 22 was inserted into the 7 langes 18A while holding the insertion tube 30.
.

Any structure that can be attached to the branch pipe 18B and an outlet communicating with the branch base pipe 13 may be used. Further, the crimping mechanism 33 is not limited to the structure of the above embodiment,
In short, any material that can bias the distal end of the insertion tube 30 to one side will suffice. Furthermore, the sliding tube 38 and 39 are omitted, and the insertion tube 3
A structure may be used in which the outer periphery of the support ring 28 can directly slide on the support ring 28.

As described above, according to the present invention, deposits inside the branch pipe can be removed in a short time without adding a flange part, etc.
Therefore, consumption of I/FH materials and fluids such as nitrogen gas can be reduced.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing piping conventionally used in a general heating furnace, Fig. 2 is an explanatory diagram showing an example of the structure of a heating furnace to which the present invention is fully applied, and Figs. 3 to 5 are illustrations of the present invention. An embodiment of the jig according to the invention is shown; FIG. 3 is a partially cutaway plan view showing the state during setting of this embodiment, and FIG. 4 is a partially cutaway plan view showing the state after setting the Ω of this embodiment. FIG. 5 is a partially cut away perspective view of this embodiment. 13, i3A...branch base tube, 14A, 14B, 1
4C. 14D, 14L 14F...Heating pipe as a branch pipe,
21...Jig, 22...Base, 26...As communication port. Discharge port, 30... Insertion tube, 33... Crimping mechanism, 41
...Connection rod, 43...Biasing arm. Agent Patent Attorney Minoru Kinoshita

Claims (1)

[Claims] (1) A jig for removing deposits inside a branch pipe that is detachably attached to an open end of a branch base pipe that communicates with one end of a plurality of parallel branch pipes, A base body having a communication port that is detachably attached and communicates with the branch base pipe; a hollow cylindrical insertion tube provided on this base body and inserted into the branch base pipe; A jig for removing deposits inside a branch pipe, the jig comprising a crimping mechanism for crimping onto one end of the branch pipe. (2. A jig for removing deposits in a branch pipe according to claim 1, wherein the insertion pipe is provided in a position adjustable in the longitudinal direction of the base body. (a) In claim 1 or 2, the crimping mechanism includes a connecting rod provided on the base body so as to be movable in a direction parallel to the insertion tube, and a connecting rod provided at the distal end of the insertion tube. 17fAl is constituted by a biasing arm which is movably supported and whose other end rotates about the one end as a fulcrum when the connecting rod moves and presses against the inner wall of the branch base pipe. Features: Jig for removing deposits inside pipes in branch piping 3.