JP2008006314A - Pipe cleaning device and pipe cleaning method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe cleaning device capable of easily inserting and withdrawing a hose without increasing the diameter of the hose for high-pressure cleaning, and a pipe cleaning method. <P>SOLUTION: A typical arrangement of the pipe cleaning device 1 of this invention comprises a high-pressure pump 2 feeding high-pressure water by compressing low-pressure water, and a high-pressure cleaning hose 3 for cleaning a pipe 9 by jetting the high-pressure water fed from the high-pressure pump 2 from the tip of a jet nozzle 6 to clean the pipe 9, wherein a pressure switching means 4 is provided between the high-pressure pump 2 and the high-pressure cleaning hose 3, and for intermittently switching the pressure of water fed from the high-pressure pump 2 between high pressure and low pressure in two steps. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe cleaning apparatus and a pipe cleaning method for cleaning a pipe by spraying high-pressure water from a tip spray nozzle.

  When piping continues to be used, some of the substances contained in the fluid that passes through may adhere to the tube wall or settle and deposit on the tube bottom, increasing the piping resistance or reducing the area through which the fluid passes. Cause trouble. This problem is particularly noticeable in the case of a drain pipe containing various foreign substances.

  There are various solutions, but the most popular drainage pipe in buildings is that a high-pressure hose is inserted inside the drainage pipe, and high-pressure washing water is supplied from the nozzle attached to the tip of the drainage pipe to the inner surface of the drainage pipe. This is a “high pressure cleaning method” in which deposits and deposits are peeled off and flowed down toward the surface.

  The high pressure washing hose is required to be flexible enough not to interfere with the passage of the drain pipe, but as the hose is inserted into the drain pipe, the contact area between the hose and the drain pipe increases. As the frictional force increases, the operator cannot push the hose further into the drainage pipe because the drainage pipe is bent at hand.

  Therefore, in most cases, as shown in FIG. 1 (b), the direction of the washing water ejected from the nozzle is not a right angle with respect to the inner surface of the drain pipe, but rather slightly toward the rear (hose side). Part of the momentum of the washing water that is ejected is used as the driving force that pulls the tip of the hose.

  On the other hand, as a drainage system for piping, a drainage method using the principle of siphon (Patent Document 1: hereinafter a siphon drainage system) and a pressure drainage system using a pump have been proposed. These drain pipes can be made smaller in inner diameter than general drain pipes used in buildings, and also have high flexibility with respect to drain gradients, so flexible resin pipes are used as drain pipes. It is also possible to use it. For example, a crosslinked polyethylene pipe having a diameter of about 15 to 20 or a polybuden pipe can be used as a drain pipe, and the construction and space saving can be greatly improved.

JP 2006-037455 A

  However, the conventional high-pressure cleaning method has a limit in the propulsive force for the following reasons, and therefore, a hose having a sufficient length against friction may not be inserted into the drain pipe. In particular, in the aforementioned siphon drainage system, etc., the friction between the hose and the drainage pipe tends to increase as the drainage pipe diameter is reduced, and a sufficiently long hose cannot be inserted into the drainage pipe against the friction. Sometimes.

  (1) Since the main purpose is the cleaning of the drain pipe, it is not possible to direct all of the cleaning water to the driving force.

  (2) The washing water cannot be sent in the nozzle direction at a certain flow rate or more for convenience of hose thickness and flexibility ensuring good workability.

  (3) Even if the above (1) and (2) are cleared, if the speed of the cleaning water ejected from the nozzle is excessively increased, the inner surface of the drainage pipe may be damaged by water pressure.

  On the other hand, as a method for increasing the propulsive force of the hose, as represented by Patent Document 2 (Japanese Patent Laid-Open No. 2005-238136), means for providing a plurality of nozzles at the middle portion of the hose has been proposed.

  However, this solution cannot be applied to drainage pipes such as siphon drainage systems having a small diameter. This is because the outer diameter of a general high-pressure washing hose used for building drainage pipes is about φ10, which is the minimum necessary for securing the flow rate of washing water that generates washing and the traction force. That's it. When this is inserted into the drainage pipe, the sprayed washing water and the deposits / deposits washed away by this flow back through a gap of only about 2.5 to 6 mm around the hose.

  Here, as in Patent Document 2, if a nozzle is provided in the middle part of the hose to obtain a propulsive force, the hose must be thickened so that the washing water can be sent to the hose. This is because the gap becomes narrower.

  Moreover, since the nozzle provided in the middle of the hose scatters water around until it is inserted into the drain pipe, it must be suppressed by some means as disclosed in Patent Document 2.

  Furthermore, even if the hose can be sufficiently inserted with this solution, a reverse driving force cannot be obtained, so that there is a possibility that the hose cannot be pulled out from the drain pipe after washing the drain pipe.

  Therefore, an object of the present invention is to provide a pipe cleaning device and a pipe cleaning method that can easily insert and pull out a hose without increasing the thickness of the high-pressure cleaning hose.

  (1) In order to solve the above-mentioned problem, a first configuration of a pipe cleaning apparatus according to the present invention is a high-pressure pump that sends out high-pressure water, and injects high-pressure water sent out from the high-pressure pump from a tip injection nozzle. And a high pressure washing hose for washing the piping, which is arranged between the high pressure pump and the high pressure washing hose, and intermittently pressurizes the water supplied from the high pressure pump in two stages of high pressure and low pressure. It has the pressure switching means to switch automatically.

  (2) The second configuration of the pipe cleaning apparatus according to the present invention is the pipe cleaning apparatus of the first configuration, wherein the high pressure is a pressure required for cleaning, and the low pressure is a pressure at which the high pressure cleaning hose can relax. It is characterized by being.

  (3) The third configuration of the pipe cleaning apparatus according to the present invention is the pipe cleaning apparatus according to the first or second configuration, wherein the pressure switching means is configured to supply high-pressure water from the high-pressure pump to the high-pressure cleaning hose. An electromagnetic valve that opens and closes a flow path, an electromagnetic valve opening and closing means that intermittently opens and closes the electromagnetic valve, and an accumulator that absorbs an impact pressure of water when the electromagnetic valve is closed. .

  (4) According to a fourth configuration of the pipe cleaning device of the present invention, in the pipe cleaning device according to any one of the first to third configurations, the cycle is 1 to 5 seconds.

  (5) The pipe cleaning method according to the present invention uses the pipe cleaning apparatus according to any one of the first to fourth aspects to inject high-pressure water from an injection nozzle at the tip of the high-pressure cleaning hose to clean the pipe. In the pipe cleaning method, in order to insert the injection nozzle to a predetermined position of the pipe, the pressure switching means is intermittently switched with the pressure of water, and the high pressure cleaning hose is applied to the pipe in the insertion direction. After inserting and pushing in, the piping is washed.

  According to the first, second and fourth configurations of the pipe cleaning apparatus according to the present invention and the pipe cleaning method according to the present invention, the hose for high pressure cleaning can be easily inserted and pulled out without increasing the thickness. be able to.

  According to the 3rd structure of the piping washing apparatus which concerns on this invention, the pressure of the water in a hose part can be switched, without turning on and off a high pressure pump, and workability | operativity can be improved. Also, the pressure switching cycle can be easily changed. Moreover, it is possible to prevent the high-pressure pump from being broken by the impact of closing the electromagnetic valve.

  A first embodiment of a pipe cleaning device and a pipe cleaning method according to the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a pipe cleaning apparatus according to the present embodiment. FIG. 2 is a configuration diagram of the pressure switching means according to the present embodiment. FIG. 3 is an explanatory diagram of the pushing of the high-pressure washing hose according to the present embodiment.

(Pipe cleaning device 1)
As shown in FIGS. 1 and 2, the pipe cleaning device 1 includes a high-pressure pump 2, a high-pressure cleaning hose 3, and a pressure switching unit 4.

  The high-pressure pump 2 pressurizes low-pressure water supplied from the water supply into high-pressure water, and sends the high-pressure water to the high-pressure washing hose 3 via the pressure switching means 4. As the high-pressure pump 2, one used in a general high-pressure cleaning method can be used.

  The high-pressure washing hose 3 has a flexible hose portion 5 and an injection nozzle 6 provided at the tip thereof. The high-pressure cleaning hose 3 injects high-pressure water (cleaning water) sent out from the high-pressure pump 2 from the injection nozzle 6 at the tip, and cleans the pipe 9 with the water pressure.

  The hose part 5 only needs to have a flexibility that does not hinder the passage of the bent part of the pipe 9, and those used in a general high-pressure cleaning method can be used.

  The injection nozzle 6 has a nozzle hole 6a for injecting high-pressure water. The nozzle hole 6a does not make the direction of the high-pressure water to be ejected (washing water) perpendicular to the inner surface of the pipe 9, but rather slightly toward the rear (on the hose portion 5 side), thereby Part of it is used as a driving force to pull the hose tip.

  The pressure switching means 4 is arranged between the high-pressure pump 2 and the high-pressure washing hose 3 and switches the pressure of the water sent from the high-pressure pump 2 intermittently (1 to 5 seconds) between the high pressure and the low pressure. . The high pressure is a pressure required for cleaning, and the low pressure is a pressure at which the high pressure cleaning hose 3 can relax.

  As shown in FIG. 2, the pressure switching means 4 has a solenoid valve 7 and an accumulator 8.

  The electromagnetic valve 7 opens and closes the flow path of high-pressure water from the high-pressure pump 2 to the high-pressure washing hose 3 intermittently (cycle of 1 to 5 seconds). The electromagnetic valve 7 of this embodiment can open and close a water channel instantaneously, and is opened and closed at intervals of about 1 second by a periodic timer 10 which is an electromagnetic valve opening and closing means.

  The period timer 10 can be set to a predetermined period of 1 to 5 seconds with a dial. Further, the electromagnetic valve opening / closing means is not limited to the periodic timer 10, and may be a manual button that opens and closes the electromagnetic valve by ON and OFF.

  The accumulator 8 temporarily absorbs the impact pressure of water generated by the high-pressure pump 2 when the electromagnetic valve 7 is closed, and releases the absorbed pressure toward the high-pressure pump 2 when the electromagnetic valve 7 is opened. Thus, when the pressure of the water sent out from the high-pressure pump 2 is intermittently switched between two stages of high pressure and low pressure, the internal pressure (water pressure) of the hose portion 5 rises and falls intermittently.

  By providing the electromagnetic valve 7, the pressure of water in the hose portion 5 can be switched without turning the high-pressure pump 2 on and off, and workability can be improved. Also, the pressure switching cycle can be easily changed. Further, by providing the accumulator 8, it is possible to prevent the high pressure pump 2 from being broken by the impact of closing the electromagnetic valve 7.

(Pipe cleaning method)
Next, a pipe cleaning method for cleaning the pipe 9 by injecting high-pressure water from the injection nozzle 6 at the tip of the high-pressure cleaning hose 3 using the above-described pipe cleaning apparatus 1 will be described.

  First, the tip of the high pressure washing hose 3 is inserted into the pipe 9. Then, the high-pressure pump 2 is operated to inject high-pressure water (washing water) from the injection nozzle 6. And the pressure switch means 4 switches the pressure of water intermittently (in this embodiment, at intervals of about 1 second). At this time, the high-pressure washing hose 3 is pushed into the pipe 9 by applying a force in the insertion direction. Thereby, high-pressure water is jetted from the nozzle hole 6a of the jet nozzle 6, and the dirt adhering to the inner surface of the pipe 9 is peeled off and flowed down by the pressure of this water.

  After inserting the high-pressure washing hose 3 to a predetermined position of the pipe 9 and removing the dirt of the pipe 9, the high-pressure washing hose 3 is pulled out with the water pressure being switched intermittently, and the pressure switching means 4 and the high-pressure pump 2 To stop the pipe cleaning.

(Action / Effect)

  At this time, the internal pressure (water pressure) of the hose portion 5 rises and falls intermittently, and the high-pressure pump 2 repeats stiffening and relaxation. That is, when the internal pressure is high (in the case of high pressure), it deforms into a shape (linear shape) that maximizes its internal volume, and when the internal pressure decreases, it tries to return to its original flexible shape. Then, the following two effects that facilitate the insertion of the high-pressure washing hose 3 can be obtained.

(Indentation effect 1)
When the hose part 5 is rigid, the friction is large due to strong contact with the inner surface of the pipe 9, but the operator's pushing force is easy to be transmitted to the hose part 5, and conversely, when it is relaxed, it is difficult to push. The friction between the hose portion 5 and the pipe 9 is not large. And since the high pressure pump 2 is on the operator side and the injection nozzle 6 for releasing the pressure is on the far side from the operator, when the hose portion 5 changes from the relaxed state to the rigid state, it always starts from the high pressure pump side (that is, Stiffness is transmitted in order (from the worker side), and finally the tip of the hose with the nozzle stiffens.

  Therefore, as shown in FIG. 2 (a), if the hose portion 5 is applied with a pressing force that does not break the hose portion 5 at the moment when the hose portion 5 is stiffened from the relaxed state, the hose portion 5 is slightly Into the pipe 9. As shown in FIG. 2 (b), the inserted portion is sequentially sent to the tip of the hose together with the rigidity of the hose portion 5. And as shown in FIG.2 (c), a nozzle will advance only the part for the last time of hose insertion (the part which pushed the hose part 5 into the piping 9).

  Next, if the solenoid valve 7 is closed and the pressurization is stopped, the washing water comes out from the injection nozzle 6, the internal pressure is lowered, and the hose portion 5 is relaxed at that position. If the above operation is performed continuously, the high-pressure washing hose 3 can be inserted into the pipe 9 easily and much longer than simply relying on the propulsive force of the high-pressure water to be ejected or the pushing force of the operator.

  That is, the high pressure washing hose 3 is inserted into the inside of the pipe 9, and the high pressure washing hose 3 is bent at hand even if the frictional force increases with the increase in the contact area between the high pressure washing hose 3 and the inner surface of the pipe 9. The high-pressure washing hose 3 can be pushed into the pipe 9 longer.

(Indentation effect 2)
There is also an effect of reducing friction itself between the pipe 9 and the hose portion 5. That is, the friction coefficient that determines the frictional force includes a static friction coefficient and a dynamic friction coefficient, but the dynamic friction coefficient is much smaller than the static friction coefficient. For this reason, even when the friction force between the hose portion 5 and the pipe 9 exceeds the pushing force of the operator and the traction force at the nozzle tip, and the high pressure washing hose 3 cannot be pushed in, the internal pressure of the high pressure washing hose 3 is interrupted. When it is moved up and down, the high pressure washing hose 3 vibrates and changes from static friction to dynamic friction. Thereby, a frictional force becomes small and it becomes easy to push in the high-pressure washing hose 3.

  Further, the high pressure cleaning hose 3 may be temporarily separated from the inner wall of the pipe 9 due to the vibration of the high pressure cleaning hose 3, and a portion where the frictional force itself disappears may appear. Thereby, the whole friction force becomes small and it becomes easy to push in the high-pressure washing hose 3.

(Effect of pulling out)
Further, when the high-pressure washing hose 3 is pulled out, the high-pressure washing hose 3 vibrates similarly to the above effect 2, and the frictional force is reduced by changing from static friction to dynamic friction. Further, the high pressure washing hose 3 is temporarily separated from the inner wall of the pipe 9, and a portion where the frictional force disappears appears, and the frictional force decreases.

  Thereby, the high pressure washing hose 3 can be easily pulled out without making the high pressure washing hose 3 thick.

  When the high pressure washing hose 3 is pulled out, the force for pushing the high pressure washing hose 3 is not applied, so that the nozzle does not move forward by the amount of hose insertion due to the looseness and rigidity of the hose portion 5 as in the above effect 1.

  The above continuous process can be realized in principle by starting and stopping the high-pressure pump 2. However, if there is a mechanism that intermittently pressurizes the high-pressure washing hose 3 between the high-pressure washing hose 3 and the high-pressure pump 2 (example of the present embodiment) or the high-pressure pump 2 itself, the workability is improved. Is preferable.

  The present invention is a technique that can be widely applied not only when a high pressure washing hose is inserted into a drain pipe but also when a small flexible pipe is inserted into the pipe.

It is a lineblock diagram of the piping washing device concerning this embodiment. It is a block diagram of the pressure switching means which concerns on this embodiment. It is explanatory drawing of pushing in of the high-pressure washing hose which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Pipe cleaning apparatus, 2 ... High pressure pump, 3 ... High pressure washing hose, 4 ... Pressure switching means, 5 ... Hose part, 6 ... Injection nozzle, 6a ... Nozzle hole, 7 ... Solenoid valve, 8 ... Accumulator, 9 ... Piping 10, Periodic timer (solenoid valve opening / closing means)

Claims (5)

In a pipe cleaning apparatus having a high-pressure pump for sending out high-pressure water, and a high-pressure washing hose for washing the pipe by injecting high-pressure water sent out from the high-pressure pump from a tip injection nozzle,
A pipe cleaning apparatus comprising pressure switching means disposed between the high-pressure pump and the high-pressure washing hose and intermittently switching the pressure of water sent from the high-pressure pump into two stages of high pressure and low pressure .   2. The pipe cleaning apparatus according to claim 1, wherein the high pressure is a pressure required for cleaning, and the low pressure is a pressure at which the high pressure cleaning hose can relax.   The pressure switching means includes an electromagnetic valve that intermittently opens and closes a flow path of high-pressure water from the high-pressure pump to the high-pressure washing hose, an accumulator that absorbs an impact pressure of water when the electromagnetic valve is closed, The pipe cleaning apparatus according to claim 1 or 2, characterized by comprising:   The pipe cleaning apparatus according to any one of claims 1 to 3, wherein the intermittent is a period of 1 to 5 seconds. A pipe cleaning method for cleaning a pipe by injecting high-pressure water from an injection nozzle at the tip of a high-pressure cleaning hose using the pipe cleaning apparatus according to claim 1,
In order to insert the injection nozzle up to a predetermined position of the pipe, the pressure switching means intermittently switches the pressure of water while pushing the high-pressure washing hose into the pipe with force in the insertion direction. A pipe cleaning method characterized by cleaning.

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