JPH0335435Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a pig used for discharge of powdery dust for final finishing in pipe cleaning to remove rust and dust from the inner surface of a pipeline.

BACKGROUND ART Conventionally, in the final finishing process of cleaning inside a pipe, for example, a dust cleaner that blows away dust with air jetted from an air hose a' through a nozzle b' as shown in FIG. 6, or a dust cleaner as shown in FIG. Powdered dust has been transported using a motsup c' as shown in Fig.

Problems that the invention aims to solve: However, since the former dust cleaner method is made of steel, it is not flexible and does not pass through curved pipes well, and the shaft core cannot be made thicker structurally, so it breaks easily and has poor durability. Moreover, the traction speed was about 2 to 3 m/min, which required a long construction time. The latter type of motsupu method has excellent passability and convenience, but if there is a drop-off section, the dust cannot be lifted up completely and remains behind, resulting in a poor dust collection rate.
There were disadvantages such as the motsup being dirty and wasted rapidly, and running costs were high.

The present invention was made with the aim of eliminating such conventional problems.

Means to solve the problem This invention removes powder dust from inside the pipeline.
A pig for discharging air in cooperation with the airflow flowing in the line, the pig body having a hollow elastic body and a cylindrical body, and an inflation gas blowing part attached to an end surface of the body. and a spiral fin integrally formed on the outer circumferential surface of the body of the pig body, and the pig body has an integrally formed tubular portion passing through the central axis of the pig body. This invention relates to a powder dust discharge pig characterized in that a tow rope is inserted and fixed in the middle.

Embodiment of Characteristic Powdered Dust An embodiment of the present invention will be described below based on the accompanying drawings.

In the pig for discharging powdery dust according to the present invention, the pig body 1 has a cylindrical body, as shown in FIGS. 1 to 3, and is formed hollow using an elastic material such as rubber.

The outer diameter of the pig body 1 is slightly smaller than the inner diameter of the applicable pipe a, and is configured such that a circumferential gap b is formed between the pig body 1 and the inner circumferential surface of the pipe a when installed in the pipe. An air blowing pipe 11 for inflating the pig body 1 is attached to one end, for example, the rear end surface.
The air inlet 11a of No. 1 is equipped with a check valve (not shown) as usual.

Flexible and elastic fins 2 made of, for example, sponge are integrally formed in a spiral shape on the outer peripheral surface of the trunk of the pig body 1. The upper end of the spiral fin 2 is connected to the tube a
When installed inside, it comes into contact with the inner surface of the tube, partitions the gap b in a spiral shape, and forms a spiral air jetting passage.

As shown in the figure, the pig body 1 is provided with an integrally formed tubular portion 12 that passes through the central axis of the pig body 1, and a tow rope C is partially inserted and fixed into the tubular portion 12. Reference numeral 13 denotes a tightening fitting for tightening and fixing the tubular portion 12 to the towing rope c.

FIG. 5 schematically shows the final finishing process for cleaning the inside of a pipe using Pig A of the present invention.

For example, in the state shown in Fig. 5, the pig A of the present invention installed in the pipe a is moved inside the pipe by pulling the rope c, and air is blown from the blower d' through the conduit e to the pipe a.
When the air is forced into the pipe, the air is ejected forward through the gap b between the pig A and the pipe a. In the figure, f is a discharge duct, g is a dust collector, and h is a lid.

At this time, the circumferential gap b is partitioned by a spiral fin 2 integrally formed on the outer circumferential surface of the pig body 1, forming a spiral air ejection passage, so that the air passing through the circumferential gap b flows at high speed. It becomes a spiral flow and is ejected forward.

Fig. 4 is an explanatory diagram of high-speed spiral flow generation by pig A of the present invention, where: Pipe a inner diameter: D ₁ Pig body 1 diameter: D ₂ Fin 2 width: W 〃 2 Height: H Average flow velocity behind the pig: If the average flow velocity when passing through v ₁ fin 2 is v ₂ , then v ₂ = πD ² / ₁ / π (D ² / ₁ − D ² / ₂ )−8WHv ₁ . In reality, a spiral velocity distribution occurs, so the flow velocity v _2onax in the high-speed region is v _2nax = αv ² (α>1).

The high-speed spiral flow formed in the tube a in this way entrains the powder dust inside the tube a and carries it out toward the front inside the tube a, which is better than the case of a straight flow parallel to the tube axis. The carrying capacity is much larger, and the purpose of carrying out powder dust can be efficiently achieved. According to the present invention, for example, the pulling speed of pig A in the pipe can be increased to about 15 to 25 m. Furthermore, since the delivery method uses a high-speed spiral flow, it is possible to completely remove powder dust and moisture from the straight and curved sections of pipe a, as well as from the grooves of pipe joints, ensuring efficiency even in complex pipelines. The inside of the pipe can be cleaned efficiently and completely beautifully.

Furthermore, the inside of the tube a is not necessarily flat, and for example, a part of the stopper (not shown) attached in the middle of the tube may protrude slightly. Because of this, it can easily deform and pass through the protrusion.

Furthermore, since the pig body 1 is hollow and has elasticity, it easily deforms along the shape of the curved pipe in combination with the flexible elasticity of the fins 2 when passing through the curved pipe, so that it can pass through the curved pipe without any trouble. can. Furthermore, when passing through a bend, the pig body 1 comes into strong contact with the inner wall of the pipe on the inside of the bend and receives a large amount of frictional resistance. Since the tensile strength in the direction is greatly enhanced, there is no risk of elongation despite the flexible elasticity and hollow shape, and the predetermined dimensional accuracy and performance can be maintained indefinitely.

Furthermore, although there may be slight differences in the inner diameter of pipelines depending on the type of pipe, the pig of the present invention can be freely deformed as described above, so when installing the pig in a pipe, for example, the pig body 1 can be attached to it. By using the attached blowing pipe 11 and inflating it slightly larger than the pipe diameter, the pig body 1 will compensate for and absorb the inner diameter difference due to the different pipe types, and the pig will not get clogged in the pipe or the fin 2 Problems such as creating unnecessary gaps between the pipe and the inner surface of the tube can be solved.

Therefore, the present invention can be applied to complex pipelines that include curved pipe sections and have inner diameter differences due to different types of pipes without causing troubles such as pipe clogging.

Furthermore, as the helical fins 2 are used, the wear dimension gradually decreases due to friction with the tube wall, and this decrease in dimension is compensated for by adjusting the degree of expansion of the pig body 1 by blowing air from the blow tube 11. Depending on the selection, the fins 2 can be covered, and can be used repeatedly for a long period of time regardless of wear and tear on the fins 2.

Effects As described above, since the present invention uses a method to transport powder dust using the action of a high-speed spiral flow, it is possible to efficiently and completely remove powder dust even in a complicated piping system. It has good passageability and can eliminate problems such as pipe clogging. Furthermore, since it is a combination of a hollow pig body and fins, it is structurally extremely simple and inexpensive, and is highly durable and easy to maintain, reducing running costs for cleaning inside the pipe.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a right side view of Fig. 1, Fig. 3 is a vertical cross-sectional view of Fig. 1, Fig. 4 is an explanatory diagram of high-speed spiral flow generation, and Fig. 5 is the implementation status of the final finishing process of cleaning inside the pipe using the pig of the present invention. FIGS. 6 and 7 are longitudinal sectional views schematically showing the state of implementation of a conventional pipe cleaning final finishing process. In the figure, 1 is the pig body and 2 is the fin.

Claims (1)

[Scope of utility model registration request] A pig for discharging powder dust from inside a pipeline in cooperation with the airflow flowing in the line, which has a hollow elastic pig body with a cylindrical body, and an end surface of the body. The pig body is composed of an attached inflation gas blowing part and a spiral fin integrally formed on the outer circumferential surface of the body of the pig body. What is claimed is: 1. A pig for discharging powdery dust, characterized in that a part of a towing rope is inserted and fixed in the upper part of the pipe.