JPS62273091A - Method of washing piping and nozzle for washing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a cleaning method and a cleaning nozzle for, for example, fluid piping for rocket fuel that requires cleanliness.

[Prior Art] Pipes used for transporting rocket fuel fluids such as liquid hydrogen are required to have a high degree of cleanliness in order to prevent dust from being mixed into the liquid.

Therefore, when manufacturing and installing piping, it is necessary to completely remove the film and dust that have adhered during the work.

FIGS. 6 and 7 are drawings showing a manufacturing method and structure of a heat-insulating double pipe used for cryogenic fluids such as liquid hydrogen.

The heat-insulating double pipe 51 is usually provided with an expandable part such as a bellows on the inner pipe side in order to absorb the difference in shrinkage between the inner and outer pipes due to a temperature difference. Conventionally, three manufacturing methods have been used.

The first method is to use single pipes 52m, 52b and bellows 5.
3 are thoroughly cleaned individually, and then assembled and welded in a compartment (clean booth) where the atmosphere is kept clean to produce the inner tube 52. Next, a heat insulating material 54 is wrapped around the outer peripheral surface of the inner pipe 52, and an outer pipe 55 is attached to complete the heat insulating double pipe 51.

As shown in FIG. 8, the second method is to horizontally install an integrally assembled insulated double pipe 51.
1 to the cleaning liquid tongue 61. After connecting the pump 62 and the cleaning liquid passing devices 63m, 63b, and 63c in series, the pump 62 supplies a cleaning liquid such as Freon or trichloroethane to the inner pipe 52, and the circulating flow of the cleaning liquid removes dust, etc. inside the pipe. Wash and remove.

A third method is as shown in FIG. 9, in which the integrally assembled double heat insulating pipe 51 is stood upright and the cleaning liquid tank 65 is opened in the same way. A pump 66 and filters 67m, 67b, and 67c are connected in series, and the pump 66 supplies the cleaning liquid from below the inner pipe 62, and the cleaning liquid is circulated through the insulated double pipe 51.
The pipe is swung from side to side to create a turbulent flow to the cleaning liquid while cleaning and removing dust from inside the pipe.

[Problems to be solved by the invention] However, in the first method, the work after assembling the inner tube as one piece and welding is carried out in a clean booth while ensuring cleanliness, which results in very poor work efficiency and The problem was that it took a long time.

By the way, in the second manufacturing method, the manufacturing time is shorter than in the first method, but since the insulated double pipe 51 is installed horizontally and cleaned, if there is an uneven part such as the bellows 53 in the middle of the inner pipe 52, the bellows The cleaning liquid does not reach the concave portion of the bellows 53 sufficiently, resulting in incomplete cleaning, and the bellows 5.
There was a problem in that the dust that had accumulated at the bottom of No. 3 could not be completely removed.

In addition, in the third manufacturing method, a long insulated double pipe 5 is used for cleaning.
1 is placed upright, which enables more effective cleaning than in the first method; however, it requires a pedestal to support or swing the insulated double pipe 51, and other cleaning equipment is required. Furthermore, the cleaning liquid in the recessed portion of the bellows 53 simply oscillates and does not effectively remove dust, resulting in incomplete removal of dust.

The present invention has been made to solve the above-mentioned problems, and provides a method for cleaning pipes and a cleaning nozzle that effectively cleans and removes dust inside the pipes.

[Means for Solving the Problems] In the cleaning method according to the first invention, a cleaning nozzle with a nozzle provided with an injection hole is attached radially to the axis of a cylinder, and the cleaning nozzle is inserted into the piping. A first cleaning liquid forming a circulating flow is fed from one end, and a second cleaning liquid is fed to the cylindrical body and sprayed radially from the nozzle, and the jet stream cleans the inside of the pipe and also cleans the pipe. The jet flow that has been completed is sucked into the circulating flow.

Further, in a cleaning nozzle according to a second aspect of the invention, a nozzle provided with an injection hole is attached radially to the axis of a cylinder, the injection hole is communicated with the cylinder, and the nozzle is curved in a spiral shape. This is what was said.

[Function] The first cleaning liquid fed from one end of the pipe passes through the nozzle of the nozzle and circulates within the pipe as a circulating flow parallel to the pipe axis.

The second cleaning liquid fed from the cylindrical body is radially injected from the injection hole of the nozzle, and the inside of the pipe is cleaned by this jet stream, and the removed dust and the like are mixed with the jet stream. This jet stream is then sucked in by the circulation stream, merges, and is collected together with the mixed dust.

[Example] Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a schematic side sectional view illustrating a state in which a heat insulating double pipe 2 is cleaned using a cleaning nozzle 1. Reference numeral 3 designates an inner tube for cleaning, and 4 an outer tube.A bellows 5 is provided in a part of the inner tube 3 to absorb the difference in shrinkage between the inner and outer tubes due to temperature differences.

Reference numeral 6 denotes a temporary pipe for cleaning, and a cleaning liquid tank and a pump (not shown) for supplying a first cleaning liquid such as fluorocarbon or trichloroethane are connected to this temporary piping. The cleaning nozzle 1 inserted into the inner pipe 3 can be freely inserted and removed and rotated in the pipe axial direction by means of a cylinder 7 inserted through the curved pipe part 6a of the temporary pipe.

Figure 2 is a perspective view of the nozzle part of the cleaning nozzle 1;
The figure is a side sectional view, and FIG. 4 is a front view taken along the line A--A in FIG. 3.

The cleaning nozzle 1 has a flat streamlined nozzle 12 attached to the tip of the cylinder 7 so that the injection hole 13 extending vertically therein is radial with respect to the axis of the cylinder 7. is,
In addition, the injection hole 13 is configured to communicate with the cylinder body 7.

In this way, the first cleaning liquid 15 fed from the temporary pipe 6 passes between the nozzles 12 as a circulating flow 15a parallel to the pipe axis. Further, the second cleaning liquid 16 of the same type fed from the cylinder body 7 becomes a jet flow of 16 g, and is dispersed from the jet hole 13 in a radial direction with respect to the tube axis. This jet stream 16a cleans the inner wall of the bellows 5, and also cleans the bottom 5a of the bellows 5.
collides with and flips toward the center along its inner wall. In this case, the dust removed by the jet stream 16a is mixed with the cleaning liquid 16, and is reversed to the center side together with the jet stream 16a. The inverted jet flow 16a containing dust is sucked into the circulation flow 15a flowing in the direction of the pipe axis, and is collected together with the dust. Wash.

FIG. 5 is a front view of the cleaning nozzle 21 of another embodiment.9 The cleaning nozzle 21 of this embodiment is similar to the cleaning nozzle 1
In the cleaning nozzle 1, the nozzle 12 is formed by a nozzle 22 curved in a spiral shape with respect to the axis, and the other structure is the same as the cleaning nozzle 1.

In this way, the jet stream 24 injected from the injection hole 23
Since a is concentrated in one direction in a vortex-like manner and the flow velocity is increased, the inside of the pipe can be efficiently cleaned.

[Effects of the Invention] As explained above, the present invention sprays the cleaning liquid radially from the injection holes and cleans using this jet stream, which is different from the conventional cleaning method in which cleaning is performed only by circulating flow. Compared to this, the cleaning liquid acts more strongly on the pipe wall, so the cleaning effect is improved.

In addition, since the cleaning liquid is sprayed in a radial direction, even if there are irregularities on the inner wall of the pipe, such as a bellows, the cleaning liquid will be sprayed into the recesses, and the removed dust will be mixed with the cleaning liquid and collected by suction through the circulation flow. .

Since cleaning is performed in this way, the entire inner circumference of the pipe is cleaned evenly without being affected by the position in which the pipe is installed, and the removed dust does not accumulate in the recesses, leaving the inside of the pipe clean. is maintained. Furthermore, since the jet pressure of the jet flow can be easily controlled, the cleaning device can be simplified and the work efficiency can be improved.

[Brief explanation of drawings]

Figures 1 to 5 show embodiments of the present invention, with Figure 1 being a schematic side sectional view illustrating the cleaning process, Figure 2 being a perspective view of the cleaning nozzle, and Figure 3 being a side sectional view. , Figure 4 is A-A in Figure 3.
5 is a partially sectional front view of the cleaning nozzle of the pond embodiment; FIGS. 6 and 7 are drawings showing the manufacturing method and structure of the insulated double pipe; FIG. 8 is a drawing showing a second conventional cleaning method, and FIG. 9 is a drawing showing a third conventional cleaning method.

Claims (3)

[Claims] (1) A cleaning nozzle with a nozzle provided with an injection hole attached radially to the axis of the cylinder is inserted into the piping, and a first cleaning liquid forming a circulating flow is fed from one end of the piping. A second cleaning liquid is supplied to the cylindrical body and sprayed radially from the nozzle, the inside of the piping is cleaned by the jet flow, and the jet flow after cleaning is sucked by the circulation flow. How to clean piping. (2) A nozzle for cleaning piping, in which a nozzle provided with an injection hole is attached radially to the axis of a cylindrical body, and the injection hole is communicated with the cylindrical body. (3) A nozzle for cleaning piping according to claim 2, characterized in that the nozzle is a spirally curved nozzle.