JP3432600B2 - Injector device for cleaning a pipe and a method for cleaning a pipe using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injector device for pipe cleaning, which is suitable for use in removing deposits adhering to various inner surfaces of pipes such as gas pipes and water pipes buried in the ground. And a tubular body cleaning method using the same.

[0002]

2. Description of the Related Art As is well known, various pipes such as water pipes, gas pipes, etc., adhere to the inner surface of the pipes (for example, in the case of water pipes, water stains if they are used for a long period of time). , Rust, etc., which adversely affect the delivered material to be delivered, and also become a resistance to the flow of the delivered material, causing clogging of the delivered material and high load on the pump etc. Often, regular removal is desired.

In recent years, as a method for cleaning a pipe in such a case, the ground in which the existing pipe is buried is excavated at a predetermined length, a part of the ground is exposed, and a part of the exposed part is cut to cut the pipe. Both ends of the body are open, and one end of the pipe with both ends open is connected to a compressor, and the other end is connected to a pipe equipped with an electrostatic precipitator, and compressed air of about 7 kg / cm ^{2 is} compressed by the compressor. A method has been adopted in which the step of spraying to remove the adhered matter adhering to the inner surface of the tube is repeated to remove the adhered matter over the entire length of the tube.

However, the above method has the following problems. I. If the pipe body to be removed has a branch pipe, compressed air does not flow into the branch pipe, and therefore the deposits on the inner surface cannot be removed. B. Since compressed air is sent in, turbulent flow is likely to occur in the pipe body, and the separated adhered substances do not flow smoothly, but are caught by the adhered substances, impairing the flow of compressed air and hindering its removal. Sometimes came. C. Since high pressure is applied to the pipe body, if the pipe body has a deteriorated portion or the like, breakage often occurs.

Therefore, in view of the above problems, the applicant excavates the ground in which the existing pipe body is buried at a predetermined length, exposes a part of the ground, and cuts a part of the exposed part to cut the pipe. Both ends of the body are opened, a negative pressure source is connected to one end side of the pipe body whose both ends are opened to form a pipe line, and then this negative pressure source is operated to generate an air flow in the pipe line, A patent application has been filed for a cleaning method for a tube body, which is designed to remove deposits adhering to the inner surface of the tube body. According to this method, it can be applied to a tubular body having a branch pipe, there is no clogging due to peeled deposits, and even if the tubular body has a deteriorated portion, the damage can be suppressed. It can be said that this method is superior to the above method.

[0006]

However, even in the above method of cleaning the pipe body, there are the following problems to be solved. I. There was a problem that the adhered matter sucked to the negative pressure source side caused a clogging in the negative pressure source and overloaded the negative pressure source. B. When the pipe to be cleaned is for sending combustible gas, gas may remain in the pipe, and when the residual gas is sucked to the negative pressure source side and its concentration becomes high. , There was a risk of ignition and explosion due to sparks generated by friction between the separated deposit and the inner surface of the pipe. C. Even when the pipe for cleaning was used to deliver gas with a foul odor, it was directly discharged from the negative pressure source, which was a nuisance to neighboring residents.

The present invention has been made in view of the above problems. It reduces the load on the negative pressure source and eliminates the risk of explosion due to ignition when applied to a flammable gas supply pipe. Moreover, it is an object of the present invention to provide an injector device for cleaning a pipe, which is capable of deodorizing exhaust gas from a negative pressure source, and a pipe cleaning method using the same.

[0008]

An injector device for cleaning a pipe according to a first aspect of the present invention is installed in a pipe line leading to a negative pressure source, and deposits such as dust on the negative pressure source side by air flow. The injector device for cleaning the pipe body, which is guided together with the injector device, is composed of a tubular body having an inlet port at one end and an outlet port at the other end, and the inner surface of the tubular body is directed from the inlet port side toward the outlet port. A narrowing portion whose inner diameter is gradually reduced, and a mixing portion having a spherical space that gradually widens from the tip of the narrowing portion and communicates with the discharge port are formed, and compressed air and pressurized water are jetted to the inlet side. Is equipped with a plurality of nozzles, and the aim of these nozzles is set along the inner surface of the narrowing section and toward the inner surface of the mixing section.

A method for cleaning a pipe according to a second aspect of the present invention relates to a method for cleaning a pipe using the injector for cleaning a pipe according to the first aspect,
One end side of the pipe body is connected to a negative pressure source to form a pipe line, and the injector device is interposed near the negative pressure source of the pipe line, and the negative pressure source is operated to operate the pipe. The air current is generated in the passage to remove the deposits on the inner surface of the pipe body, and the compressed air and the pressurized water are jetted from the plurality of nozzles so as to be sucked to the negative pressure source side together with the removed deposits. It is characterized by having done.

[0010]

The injector for cleaning a pipe body according to the first aspect is used by being inserted in a pipe passage leading from one end side of the pipe body to the negative pressure source. When the adhered matter separated from the inner surface of the pipe is guided to the negative pressure source side together with the airflow, the compressed air and the pressurized water sprayed from the plurality of nozzles are rapidly diffused from the squeezing section to the mixing section. Is increased, and the load on the negative pressure source is reduced. Also,
In the mixing section, the airflow and the separated deposits are mixed with the compressed air and the pressurized water sprayed from the nozzle, so that the deposits adsorb water to the negative pressure source side.

In the invention of claim 2, one end side of the pipe body is connected to a negative pressure source to form a pipe line, and the injector device is interposed near the negative pressure source of the pipe line, The negative pressure source is actuated to generate an air flow in the pipe, and the deposits on the inner surface of the pipe are removed. Then, the removed deposit is sucked toward the negative pressure source side together with the compressed air and the pressurized water sprayed from the plurality of nozzles of the injector device.

[0012]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 and FIG. 2 show an embodiment of an injector device (hereinafter, simply referred to as “injector device”) 1 for cleaning a tubular body according to the present invention.

As shown in FIG. 1, the injector device 1
Comprises a tubular body 4 having an inlet 2 at one end and an outlet 3 at the other end. The tubular body 4 is configured such that the first to third tubular bodies 5 to 7 are fastened and coupled with bolts or bolts / nuts between joint flanges at respective ends via packing (not shown). It is a thing.

The first pipe body 5 has the introduction port 2 at one end.
It has a communication opening 8 communicating with the second tubular body 6 at the other end and has a substantially circular cross section that extends in a substantially linear shape, and joint flanges 5a and 5b are formed at the ends thereof. Further, the inner diameter thereof is approximately the same as that of the pipe A for cleaning, and the introduction chamber having the introduction ports 9a for compressed air and pressurized water is provided on the non-joint surface side of the joint flange 5b on the communication port 8 side. 9 ... are provided. Further, communication holes 10 ... Communicating with the introduction chambers 9 ... Are formed along the circumferential direction of the connection flanges 5b in the radial middle portion of the connection flanges 5b (see FIG. 2), and the nozzles 10a are provided in these communication holes 10. Is installed.

The second tubular body 6 has the first tubular body 5 at one end.
Further, it is a tube body having a truncated cone shape in cross section having communication ports 11 and 12 communicating with the third tube body 7 at the other end, and joint flanges 6a and 6b are formed at both ends thereof. The joint end with the first pipe body 5 is formed so as to surround the nozzles 10a ... And the inner diameter of the joint end with the third pipe body 7 is smaller than the inner diameter of the pipe body A. The inner diameter is gradually reduced from the inlet 2 side toward the outlet 3.

The third tubular body 7 has the second tubular body 6 at one end.
A communication hole 13 communicating with the discharge port 3 at the other end,
This is a pipe body having a spherical space S that gradually widens from the joint end with the second pipe body 6 and communicates with the discharge port 3, and joint flanges 7a and 7b are formed at both ends thereof.

Here, the second pipe body 6 and the third pipe body 7 constitute a narrowing portion 14 and a mixing portion 15, respectively, and the nozzles 10a ... Are for compressed air and pressurized water. The ones for use are alternately arranged, and their radiating properties are such that the compressed air and the pressurized water are viewed from the side and follow the inner surface of the squeezing portion 14 in the vicinity of the joint surface of the second and third pipe bodies 6, 7. It is set so as to be jetted toward the curved inner surface of the mixing portion 15 while intersecting with each other.

Next, the injector device 1 of the above embodiment
A method of cleaning the tubular body A by using will be described.
FIG. 3 shows a situation in which the cleaning method of the pipe A according to the present embodiment is applied to the cleaning of the pipe buried in the ground under the paved road. In the figure, reference numeral A'is one section road for cleaning the pipe A, B ...
Is a branch pipe branched from the pipe A, P is a vacuum pump (negative pressure source)
Is a suction wheel, G is the ground, and W is a pipeline.

As shown in the figure, excavation shafts 16 and 17 are excavated at a predetermined interval in the ground G in which the pipe body A is buried, and exposed inside the excavation shafts 16 and 17 of the pipe body A. The drawn-out pipes 18 and 19 provided with the branch pipes 18a and 19a bent upward are connected to the respective portions. These branch pipes 18, 19 have flexible hoses 20,
21 is connected, and the hose 20 is connected to a vacuum pump (not shown) of a suction car stopped on the ground, and the hose 2
The other end of 1 is open. Here, the pipe body A, the extraction pipes 18 and 19, and the hoses 20 and 21 form a pipe line W.

Then, in this state, the vacuum pump P of the suction wheel is operated to generate an air flow in the pipe W,
Adhesive matter (not shown) attached to the inner surfaces of the section A'of the pipe A and the branch pipes B ... Can be removed.

Next, the steps of the method of cleaning the pipe A will be described. First, the ground G in which the pipe A is buried
Excavations 16 and 17 are formed at predetermined intervals by excavating to a predetermined depth so that part of the pipe A is exposed. Then, the exposed portion of the tubular body A is cut by a predetermined length, and the portion in which both ends of the tubular body A are opened is used as a section path A'for cleaning. Then, the extraction pipes 18 and 19 are connected to both ends of the section path A'with the branch pipes 18a and 19a being directed upward.

Next, the branch pipes 18a of the extraction pipes 18 and 19,
Attach flexible hoses 20 and 21 to 19a,
The hose 20 is connected to a vacuum pump (not shown) of the suction wheel C that is on standby on the road side of the paved road, and the end of the hose 20 is opened to form the conduit W. here,
The injector device 1 is provided near the vacuum pump with the discharge port 3 facing the vacuum pump (not shown). Then, the vacuum pump is operated to generate an air flow in the pipe W to remove the deposits on the inner surface of the pipe A, and the compressed air and pressurized water are jetted from the plurality of nozzles 10a ... Suck to the vacuum pump side together with the attached substances. The pressurized water sprayed from the nozzle 10a may be mixed with a deodorant.

After removing the deposits, the extraction pipe 18 on the side for further removing work is left as it is, and the extraction pipe 19 is replaced with a linear single pipe (not shown).
, And the excavation pit 17 is backfilled to complete the cleaning of the section road A ′. By repeating the above steps, the entire length of the tubular body A is cleaned.

In the injector device 1 of the upper embodiment,
When the deposits separated from the inner surface of the tubular body A are guided to the vacuum pump side together with the airflow, the compressed air and the pressurized water sprayed from the plurality of nozzles 10a are rapidly diffused from the squeezing section 14 to the mixing section 15. As a result, the speed of the air flow is increased, and the load on the vacuum pump is reduced. In addition, compressed air and pressurized water are mixed with the attached matter in the mixing section 15 together with the air flow, and the mixture is sucked toward the vacuum pump.

Further, in the above-mentioned method for cleaning the pipe A, one end of the pipe A is connected to the vacuum pump to form the pipe W, and the injector device 1 is provided near the vacuum pump in the pipe W. It is interposed and the vacuum pump operates to generate an air flow in the pipe W. Then, the deposits on the inner surface of the section path A ′ of the pipe A are removed, and the removed deposits are sucked toward the vacuum pump together with the compressed air and the pressurized water sprayed from the plurality of nozzles 10 a of the injector device 1. It

As described above, according to the injector device 1 of the above-described embodiment, when the adhered matter separated from the inner surface of the pipe A is guided to the vacuum pump side together with the air flow, compressed air sprayed from the plurality of nozzles 10a ... Since the pressurized water is made to diffuse rapidly from the squeezing section 14 to the mixing section 15, the speed of the airflow is increased and a large load is not applied to the vacuum pump. In addition, in the mixing unit 15, compressed air and pressurized water are jetted and mixed with the separated adhered matter and airflow, and the mixed state is introduced to the vacuum pump side. Even when applied, there is no danger of explosion due to ignition, and it is also possible to deodorize exhaust gas by mixing deodorant with pressurized water.

Further, the injector device 1 of the above embodiment
According to the method of cleaning the pipe A using the above, the injector device 1 is provided near the vacuum pump of the pipe W,
By operating the vacuum pump to generate an air flow in the pipe W, it is possible to remove the deposits on the inner surface of the section A ′ of the pipe A. Then, compressed air and pressurized water are jetted from the plurality of nozzles 10a of the injector device 1 to the removed adhered substances, and the mixed substances are sucked to the vacuum pump side, so that the load on the vacuum pump is reduced. In addition, even when applied to a flammable gas supply pipe, there is no danger of explosion due to ignition, and it is possible to deodorize exhaust gas from a vacuum pump by mixing deodorant with pressurized water.

In the above embodiment, the present invention is applied to the ground G.
However, the present invention is not limited to this application, and can be applied to various pipes such as a water pipe and a gas pipe fixedly fixed in a building. Needless to say.

When the deposits adhering to the inside of the pipe A cannot be removed by the above method, as shown in FIG.
Instead of the hose 21 on the open end side, a pipe body 22 having a U-shaped pipe line 22a in a side view is connected to an intermediate portion in the vertical direction, and the full-bore valve 23 is connected to the open end portion of the pipe body 22. After the abrasive filling hopper 24 is attached via the vacuum pump and the air flow is generated in the section A'by the vacuum pump, the full-bore valve 23 is opened to move the abrasive in the hopper 24 into the section A'with the air flow. Alternatively, the inner surface of the pipe A may be polished by contacting the adhered material on the inner surface of the section path A ′ with an abrasive to remove the adhered material.

[0030]

According to the injector device for cleaning a tube and the method for cleaning a tube using the same according to the present invention, the following effects can be obtained. According to the pipe cleaning injector of claim 1, the compressed air and the pressurized water sprayed from the plurality of nozzles are discharged from the squeezing portion when the adhered matter separated from the inner surface of the pipe is guided to the vacuum pump side together with the air flow. Since it is made to diffuse rapidly in the mixing section, the speed of the air flow is increased, and a large load is not applied to the vacuum pump. Further, in the mixing section, the separated adhered matter and the air stream are sprayed with compressed air and pressurized water to mix them, and they are guided to the vacuum pump side in a mixed state, so that they are applied to a flammable gas feed pipe. In this case, there is no danger of explosion due to ignition, and it is also possible to deodorize the exhaust gas by mixing the deodorant with pressurized water.

According to the second aspect of the present invention, there is provided a pipe body in which one end side of the pipe body is connected to a negative pressure source to form a pipe line, and the pipe body injector device is interposed in the pipe line. Installed, the negative pressure source is operated to generate an air flow in the pipe line, removes the adhered substances adhering to the inner surface of the pipe body, and the compressed air and pressurized water sprayed from the plurality of nozzles of the injector device are removed. Since it is also sucked to the negative pressure source side, it can be applied to a pipe with a branch pipe, and there is no clogging due to peeled deposits, and even if there is a deteriorated part in the pipe, it will not be damaged. In addition to the conventional effect of being able to suppress, the load on the negative pressure source is reduced, and there is no risk of explosion due to ignition when applied to a flammable gas supply pipe, and the negative pressure source Exhaust can be deodorized A.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of an injector device for cleaning a tube according to the present invention.

FIG. 2 is a sectional view taken along the line aa in FIG.

FIG. 3 is a schematic side view showing a state in which the tube body buried in the ground is being cleaned by applying the tube body cleaning method according to the present invention.

FIG. 4 is a schematic side view showing a state in which an abrasive material introducing device is attached to the open end side of the tubular body.

[Explanation of symbols]

1 Injector device for tube cleaning 2 entrance 3 outlets 10a nozzle 14 narrowing section 15 mixing section A tube S spherical space W pipeline

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B08B 5/02 B08B 9/02

Claims (2)

(57) [Claims] 1. An injector device for cleaning a pipe body, which is interposed in a pipe line leading to a negative pressure source and guides deposits such as dust to the negative pressure source side together with an air flow, wherein an inlet is provided at one end and the other end is provided. It is composed of a tubular body provided with a discharge port, and the inner surface thereof has a narrowed portion whose inner diameter gradually decreases from the inlet side toward the discharge port, and a gradually widened portion from the tip of the narrowed portion. A mixing section having a spherical space communicating with the discharge port is formed, and a plurality of nozzles for injecting compressed air and pressurized water are provided on the introduction port side, and the aim of these nozzles is on the inner surface of the narrowing unit. An injector device for cleaning a pipe body, which is set along the inner surface of the mixing portion. 2. A method for cleaning a pipe using the injector for cleaning a pipe according to claim 1, wherein one end side of the pipe is connected to a negative pressure source to form a pipe, and The injector device is provided in the vicinity of the negative pressure source of the pipe, and the negative pressure source is activated to generate an air flow in the pipe to remove deposits on the inner surface of the pipe, A method for cleaning a tubular body, characterized in that compressed air and pressurized water are jetted from the plurality of nozzles and sucked toward the negative pressure source side together with the removed deposits.