KR100312705B1 - Apparatus for scaling inner wall of feed water pipe and the like - Google Patents

Abstract

PURPOSE: An inner cleaning device is provided to clean scale or foreign material inside of a pipe by injecting compression air into the pipe. CONSTITUTION: A second branch pipe(4) is installed by an attaching member(3) attaching freely to a water supplying portion(2) of a water supply pipe(1). A first and second electric valve(7,8) is installed to one side of the second branch pipe. Compression air amount and injection time are controlled by timers(10,11). A timing adjusting timer(12) and a work resting timer(13) are provided to control the cleaning.

Description

Apparatus for scaling inner wall of feed water pipe and the like}

The present invention relates to an internal cleaning device used for removing and cleaning impurities such as scale and oil deposited in a water supply pipe and the like, and more particularly, powerful compressed air inside the water supply pipe. By firing intermittently and imparting a large pressure in the tube instantaneously, a so-called shock wave of water hammer action is generated in the tube, and the shock wave is used to physically remove impurities such as scale in the tube. The present invention relates to an improvement of an internal cleaning device for cleaning the inside of a tube by peeling off.

Background Art Conventionally, as an internal cleaning device such as a water supply pipe of this kind, a device specified in Japanese Patent Application Laid-Open No. 2-37236 has already been known. By the way, in order to exfoliate and remove the scale etc. which generate | occur | produce in the pipe | tubes, such as a water supply pipe efficiently using physical action (physical principle), it is calculated | required to generate | occur | produce the action in a pipe | tube at short intervals. However, since the conventional apparatus described above is configured to launch compressed air into a tube by one solenoid valve, there is a limit to the interval between shots of compressed air by one solenoid valve, and the interval required by any method, For example, compressed air cannot be fired intermittently in a tube at intervals of 0.25 to 0.5 seconds.

However, the solenoid valve requires a time of at least 0.5 seconds for repeated opening and closing operations in order to intermittently generate shock waves in the tube. For example, the solenoid valve is opened and closed at 0.5 seconds, which is the limit time. Even if the operation timing between the air ejection timer and the air stop timer is set in the form of sending an opening / closing operation signal to the solenoid valve, considering the operation error of the solenoid valve, it is impossible to generate shock waves intermittently in the pipe. . For example, there arises a malfunction that causes the solenoid valve to enter the next opening operation before returning completely from the open state to the closed state, and it is impossible to continuously generate shock waves in the pipe. In other words, it is impossible to generate shock waves intermittently in the tube in order to exfoliate and remove scales and the like efficiently with a physical effect.

Therefore, in the conventional apparatus, as described in the right column on page 200 of the notification page 200 and the left column on page 201 of the 201 page, cleaning is performed to completely remove scales and the like from the tube within one working time set in the integrated work timer. It was not possible to carry out a complete cleaning that any part of the scale or the like would remain without peeling off in the tube by any method. Therefore, in order to completely remove scales and the like, a washing operation divided by at least two times is required. At the end of the first working time, an operator washes in a place where a water supply pipe, etc., which is being cleaned, is piped. It was a time-consuming task with difficulty in the workability of returning to the place where the device was installed and restarting the device.

Therefore, the inventors of the present invention have repeated various studies based on long time experiences and performances, and as a result, it is possible to efficiently and completely remove all scales generated in the pipes such as the water supply pipe within one working time by the comprehensive work timer. Furthermore, an object of the present invention is to provide an internal cleaning device capable of carrying out chemical treatment in the tube while removing scale and the like generated in the tube.

In order to achieve the above object, the technical means devised by the present invention is to provide a two-branch engine through a mounting bracket which can be freely attached to and detached from one water supply of the water supply pipe. The discharge valve is connected to one connection port of the two branch pipes, and the first and second solenoid valves are connected to the other connection port in parallel and through the pressure regulating valve frame to the storage tank connected to the compressor. A first air ejection / stop timer for varying the amount of compressed air and its firing interval according to the opening and closing times of the first solenoid valve described above; On the side, a second air ejection / stop timer is provided, in which the amount of compressed air and its firing interval vary depending on the opening time and the closing time of the second solenoid valve, and the air by the second air ejection / stop timer is also provided. Timing adjustment timers varying with respect to the air ejection / stop operation timing of the air by the first air ejection / stop timer described above, and the first and second air ejection / stop timings A work pause timer for first stopping the one-cycle operation consisting of stopping the ejection of the air by a time multiplied by the number of times of the above timers by one cycle consisting of the ejection / stopping of each air, and the first and second hair ejection / Comprehensive work timer for setting the total work time by the time multiplied by the stop time of the work pause timer and the number of times each stop timer and the number of stops, and the above-mentioned first and second operations. It is a summary that the relay which connects to the said work pause timer is installed and comprised so that an air blowing / stopping timer may open and close each 1st, 2nd solenoid valve.

In addition, a three-way engine is provided through a mounting bracket that can be attached and detached freely before one water supply line of the water supply pipe, and a discharge valve is provided at one connection port of the three-way engine, and an air side check valve is provided at the other connection port. The first and second solenoid valves each having a parallel tank and a storage tank communicating with the compressor via pressure regulating valves, respectively, are arranged and installed to the first solenoid valve side. The first air ejection / stop timer, which is variable depending on the opening time and closing time of the valve, is connected, while the second solenoid valve side is variable by the opening time and closing time of the second solenoid valve as described above. The air by the first air ejection / stop timer as described above, and the second air ejection / stop timer is connected, and the air ejection / stop timing of the air by the second air ejection / stop timer is The timing adjustment timer that varies with the blow-and-stop operation timing, and the first cycle consisting of the blow-off and the stop of the air of each of the first and second air blow-out / stop timers, multiplying the number of times of the above-mentioned timers by the time, The total work time is set by a time obtained by multiplying the number of times of each of the first and second blow-stop timers by the work pause timer that first stops one cycle operation of blow-off and stop, and the pause time of the work pause timer. And a work timer for stopping the operation after the set time has elapsed, and for opening and closing the respective first and second solenoid valves to the first and second air ejection / stop timers. A chemical liquid injection device is provided through a chemical liquid side check valve at the remaining connection port of the three branch engines. The point is that the work timer is connected.

Thus, according to the above-described claim 1 of the present invention, the amount of firing and the firing interval of the compressed air which is supplied and discharged into a pipe such as a water supply pipe through the first solenoid valve and the firing interval thereof, The firing time and the firing interval of the compressed air discharged and supplied to the water supply pipe through the second solenoid valve can be set according to the opening time and the closing time of the first solenoid valve by a relay or the like. The opening and closing time of the second solenoid valve by the stop timer and the relay can be set. Thereby, the firing interval by the opening time and the closing time of the first solenoid valve by the first air ejection / stop timer and the relay, etc., and the opening time and the closing of the second solenoid valve by the second air ejection / stop timer and the relay, etc. Compressed air can be launched into the tube by a firing interval due to time or the like, and the timing of firing compressed air from the second solenoid valve by the second air ejection / stop timer and the relay is controlled by a timing adjusting timer and a relay. It can be replaced with the firing timing from the first solenoid valve. That is, the firing rhythm (injection rhythm) of the compressed air can be arbitrarily changed by the driving operation of the first solenoid valve and the second solenoid valve. Then, the air discharge can be temporarily stopped by the work pause timer for each time multiplying the number of times by one cycle consisting of the ejection / stopping of the air by the first solenoid valve, the second solenoid valve, or the like. Further, the second cycle of the second air ejection / stop timer and the relay is obtained by multiplying the number of times by the number of times the cycle consisting of the ejection / stoppage of the air of the first solenoid valve by the first air ejection / stop timer and the relay. Since the sum of the times multiplied by the number of cycles of the blow-off and stop of the air from the valves is added, and the sum of the washing time combined with the rest time by the work pause timer is set as a comprehensive work timer. The series of cleaning operations for launching compressed air into the tube from the first and second solenoid valves is automatically stopped.

According to the description of claim 2, the chemical liquid is injected from the chemical liquid injection device into a pipe such as a water supply pipe during the cleaning operation of the above-described first claim. This chemical liquid injection operation is automatically stopped at the same time as the above-described series of cleaning operations by the comprehensive operation timer.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an internal cleaning apparatus according to claim 1, wherein the water supply pipe 1 for cleaning is piped in a building or the like to provide a suitable water supply ( 2) is attached. A bifurcation engine 4 is provided through a mounting bracket 3 that is freely attached to and detached from one water supply faucet 2 of the water supply pipe 1, and a discharge valve ( 5), the other connection port is provided with a connection arrangement of the cleaning device A through the non-return valve 6, so that both of the first and second solenoid valves 7 and 8 described later of the cleaning device A are provided. By intermittently intermittent operation, pressurized momentary pressure in the tube was intermittently fired into the tube of the water supply pipe 1 at short intervals, for example, 0.25 to 0.5 seconds. By generating water hammer action so-called shock waves at intervals of 0.25 to 0.5 seconds. By using this shock wave, impurities such as scales attached to the inner wall surface of the tube can be physically and efficiently peeled off and removed to be washed out.

The device configuration of the cleaning device (A) is a two-minute pipe at the site opposite to the water supply side of the attachment bracket (3) attached to and detached from the water supply pipe (2) attached to the water supply pipe (1). A discharge valve 5 for discharging dirt to one connection port is connected to the pipe through the connection port 4, and a non-return valve 6 for preventing retention of retained water and dirt in the receiving pipe 1 to the other connection port. In addition, the first and second solenoid valves (7) (8) are connected in parallel to each other through the branch pipe (9) serving as a compressed air discharge port to the non-return valve (6). The amount of compressed air projected into the water supply pipe 1 toward the first solenoid valve 7 is varied by the opening time of the first solenoid valve 7, and the firing interval is controlled by the first solenoid valve ( The second solenoid valve is connected to the air ejection / stop timer 10 which is variable by the closing time of 7), and the amount of compressed air to be discharged into the above water supply pipe 1 is similarly applied to the second solenoid valve 8 side. The second air ejection / stop timer 11, which is varied by the opening time of (8) and whose firing interval is varied by the closing time of the second solenoid valve 8, is connected by wiring.

The first air jetting / stopping timing of the air by the second air jetting / stopping timer 11 is applied to both of the first air jetting / stopping timer 10 and the second air jetting / stopping timer 11 described above. The variable timing adjustment timer 12 is wired and connected to the air ejection / stop operation timing of the air by the stop timer 10, and each of the first and second air ejection / stop timers 10 and 11 is connected. The work pause timer 13 which first stops the one cycle operation consisting of the blowing and stopping of the air by the time multiplied by the number of times of the timers 10 and 11 described above by one cycle consisting of the blowing and stopping of the air. ).

In addition, the work time is set by the time multiplied by the number of times of one cycle of blowing and stopping of the air, and the integrated work timer 14 for stopping the operation after the set time has elapsed is connected. In addition, the storage tank 16 communicated with the compressor 15 is connected to the first and second solenoid valves 7 and 8 through the pressure regulating valve 17, and the first and second reservoirs 16 are connected to each other. The first and second air ejection and stop timers 10 and 11 are opened and closed to operate the first and second solenoid valves 7 and 8 to the second air ejection and stop timers 10 and 11. The work pause timer 13 which pauses the firing operation of the air from the first and second solenoid valves 7 and 8 by the wire) is connected and connected to the pause timer 13 to the first and second air. The relay 18 which opens and closes the 1st, 2nd solenoid valves 7 and 8 by the blow-off / stop timer 10 (11) etc. is connected.

The first and second solenoid valves 7 and 8 are connected to the other side of the branch pipe 4 so as to prevent backflow to prevent backflow of dirt mixed with the retained water in the water supply pipe 1 and the scale which has been removed. The air ejected from the first and second air ejection / stop timers 10 and 11 respectively connected in parallel to the valve 6 via a branch pipe 9 serving as a launch tube, and transmitted through a relay 18. -Open / close operation by a stop count signal, and the compressed air sent through the communication piping path with the storage tank 16 is discharged and supplied into the water supply pipe 1 at predetermined firing intervals, respectively.

The first and second air ejection / stop timers 10 and 11 control the opening / closing timing of each of the first and second solenoid valves 7 and 8 by means of a relay 18 and the like. It plays a variable role in the firing interval of the compressed air to be launched into the tube. On the other hand, the timing adjustment timer 12 relays the second air ejection / stop timer 11 and the relay after the opening operation of the first solenoid valve 7 by the first air ejection / stop timer 10 and the relay 18 or the like. (18) serves to vary the opening timing of the second solenoid valve (8). That is, the second air ejection / stop timer 11 changes the timing of the compressed air in the second solenoid valve 8 (changes the firing rhythm) with respect to the firing timing of the compressed air in the first solenoid valve 7. The air timing signal transmitted to the second solenoid valve 8 from () serves to change the timing of transmission. As a result, in the pipe of the water supply pipe 1, the best firing interval for efficiently and completely peeling off and removing all scales and the like generated in the pipe, for example, about 0.25 to 0.5 seconds, which is impossible in the conventional apparatus, is fired. Compressed air is fired intermittently at intervals to increase the cleaning effect.

The work pause timer 13 includes air from the first and second solenoid valves 7 and 8 individually controlled by the first and second air ejection / stop timers 10 and 11 and the relay 18. For example, one cycle consisting of ejecting and stopping the air from the first and second solenoid valves 7 and 8, which pauses the operation by the time multiplied by the number of times of one cycle, Each one second interval, and the opening and closing operation timing between the first solenoid valve 7 and the second solenoid valve 8 is carried out with a difference of about 0.25 seconds, the number of times is 10 times 20 times in total In the case of setting, for example, to pause the operation, after 10.25 seconds have elapsed since the start of the compressed air, the air emission from both solenoid valves 7 and 8 is paused. The first and second solenoid valves 7 and 8 serve to resume firing of compressed air at the above intervals. All. As the rest time by this work pause timer 13, it is preferable to set it as the time until the shock wave which generate | occur | produced in the water supply pipe 1 by the supply of compressed air is completely received, and the inside of a pipe returns to the original stopped state. .

The comprehensive work timer 14 operates the first and second solenoid valves 7 and 8 by the first and second air ejection / stop timers 10 and 11, the relay 18, and the like, as described above. It is to set the total work time for launching compressed air into the water supply pipe 1 by the time multiplied by the rest time of the rest timer 13. The work timer 14 is used to generate impurities and adhere state such as scale. Therefore, the cleaning apparatus A is automatically operated by setting in advance the amount of shots of compressed air per shot, its firing interval, and the number of times, and automatically starts the washing apparatus A after the set time has elapsed. To stop.

In the figure, reference numeral 19 denotes a snap switch provided in the middle of the wiring in which the timing adjustment timer 12, the second air ejection / stop timer 11, the integrated work timer 14, and the like are connected in wiring, and the switch 19 is turned on. By simultaneously operating (operating) both the first and second solenoid valves 7 and 8, the firing rhythm of the compressed air in both the first and second solenoid valves 7 and 8 is changed to the water supply pipe 1. In the form that can supply and discharge, and by opening the switch 19, the second solenoid valve 8 is operated alone, so that the compressed air can be supplied to the water supply pipe 1 by the second solenoid valve 8 alone. Consists of. Reference numeral 20 is a pressure gauge.

Next, the cleaning method of the water supply pipe 1 to be cleaned by the cleaning device A of the present embodiment configured as described above will be described. The mounting bracket 3 is attached to one water supply 2 of the water supply pipe 1. , The pipe is piped through the mounting bracket (3), the two branch pipes (4) are connected to the mounting bracket (3), and the cleaning device (A) is connected to the water supply pipe (1). Then, the first and second air ejection / stop timers 10, 11, the timing adjustment timer 12, the work pause timer 13, and finally the comprehensive work timer 14 of the cleaning device A are used. The start switch is set by setting the respective times based on the data obtained from the experimental results, and the first and second solenoid valves by the first and second air ejection / stop timers 10 and 11 and the relay 18 and the like. 7) According to the opening and closing of (8), the compressed air is intermittently fired and supplied into the tube whose one end is blocked by water. At this time, the firing intervals of the compressed air in the first and second solenoid valves 7 and 8 are intermittently compressed air at a firing interval of about 0.25 to 0.5 seconds as set in the timing adjusting timer 12, for example. Is fired. Then, the pressure is applied in the tube at intervals of 0.25 to 0.5 seconds as described above according to the firing pressure, and the water contained in the tube receives the shock wave to form the bubbles of the fine particles, and the bubbles of the portion with the passage of time. Breaks and generates ultrasound. In detail, the shock wave repeatedly occurs intermittently at intervals of about 0.25 to 0.5 seconds in the tube, and ultrasonic waves are generated accordingly. As a result, impurities such as scales attached to the inner wall of the tube are physically peeled off. At this time, the release of the compressed air from the first and second solenoid valves 7 and 8 is paused for each set number of times by the work pause timer 13, and the set time set by the comprehensive work timer 14 has elapsed. Repeatedly performed until the total work timer 14 is multiplied by the number of times of firing of the compressed air of each of the first and second solenoid valves 7 and 8 times the idle time of the work pause timer 13. The washing apparatus A is automatically stopped by the elapse of the set time set to. Then, the separated impurities are transported in the pipe by mixing with the shock wave and discharged to the outside with the shock wave by the opening of the drain valve 5.

Therefore, according to the washing | cleaning apparatus A of this invention, the 1st, 2nd solenoid valves 7 and 8 of the 1st, 2nd air ejection / stop timer 10, 11, the relay 18, etc. By opening and closing and varying the firing timing of the first solenoid valve 7 and the second solenoid valve 8 by the timing adjusting timer 12, impurities such as all scales and the like generated in the pipe can be efficiently and completely removed. Compressed air is fired into the tube at the best firing interval possible, and within the set total time of the integrated work timer 14, i.e. within one working time set by the timer 14 described above, Cleaning can be done.

FIG. 2 shows the internal cleaning apparatus of the present invention according to claim 2, and the device configuration of this cleaning apparatus A is basically the same as that described in claim 1, in that the same configuration is the same. The detailed description of the symbols is omitted, and only different components are described below.

By the way, in the case of the internal cleaning device of this embodiment, the three-pipe engine 21 is opened through the attachment bracket 3 that can be freely attached to and detached from the water supply pipe 1 of the water supply pipe 1 to be cleaned. And a washing device (A) is connected to one connection port of the three branch engine (21) via a non-return valve (6) to the other connection port, and the other connection port is provided. The chemical liquid injection device (B) is connected and arranged through the non-return valve (22), and the chemical liquid is injected into the pipe of the water supply pipe (1) by the operation of the metering pump (23) described later of the injection device (B). The chemical treatment in the tube can be performed while the cleaning operation is performed to physically remove and remove impurities such as scale by shock waves caused by compressed air intermittently fired from the cleaning apparatus A.

The chemical liquid injection device (B) is to sterilize the iron bacteria generated in the water supply pipe (1) to perform a quantitative injection of a fungicide into the water supply pipe (1) to prevent the generation of new slime or colony. The pump is provided with a non-return valve 22 which prevents backflow of retained water and dirt in the water supply pipe 1 and prevents the inflow of compressed air to the remaining connection port of the three branch engine 21, and the pump ( 23 is wired and connected to the integrated work timer 14 so as to automatically operate and automatically stop by the timer 14 described above. The chemical liquid tank 24 is pipe-connected to the metering pump 23 so that the chemical liquid in the tank 24 is quantified by the metering pump 23 and metered into the water supply pipe 1.

The dosing pump 23 is wired to the integrated work timer 14 and starts operation at the same time as the start of the compressed air from the first and second solenoid valves 7 and 8 to start the chemical liquid into the water supply pipe 1. It is a quantitative injection. Therefore, the first and second solenoid valves 7 (8) by the first and second air ejection / stop timers 10 and 11, the relays 18, and the like are included in the integrated work timer 14 in this embodiment. ) A fixed-quantity pump which sets the total working time for releasing compressed air into the water supply pipe 1 by the time multiplied by the above-mentioned idle time of the work pause timer 13, and at the same time corresponds to the total working time. The operation starts simultaneously with the operation of the washing apparatus A which starts automatically by setting the operation total time of (23), and simultaneously with the stop of the washing apparatus A which automatically stops after the set time has elapsed. It is to stop.

In the figure, reference numeral 25 denotes a snap switch provided in the middle of the wiring for connecting the metering pump 23 and the integrated work timer 14 to the wiring. The cleaning device A and the chemical liquid injection device B are brought into contact with the switch 25 by conduction. And the like are interlocked to start the operation.

Therefore, according to the washing | cleaning apparatus A comprised as mentioned above, the 1st, 2nd solenoid valves 7 (8) by the 1st, 2nd air ejection and stop timer 10 (11), the relay 18, etc. When the intermittent firing supply of the compressed air into the tube whose one end is blocked by water is started by opening and closing of the gas, the chemical liquid injection device (B) also starts to operate and enters the tube by the metering pump (23). Start dosing of chemicals. As the set time set in the integrated work timer 14 elapses, the cleaning device A stops and the chemical liquid injection device B also automatically stops.

The internal cleaning device such as a water supply pipe of the present invention is configured as described above, and thus achieves the following operational effects.

(1) According to claim 1, the first and second air ejection / stop timers and the amount of shots per shot into the water supply pipe of the compressed air due to the opening time and the closing time of the first and second solenoid valves, respectively. And the firing interval thereof, and the timing adjustment timer varies the firing timing of the compressed air in the second solenoid valve with the firing timing in the first solenoid valve, that is, the first solenoid valve and the second solenoid valve. The firing rhythms (injection rhythms) of the compressed air can be arbitrarily changed by mutual driving operations, so that impurities such as all scales generated in the pipes can be efficiently and completely removed into the pipes such as the water supply pipes to be cleaned. Compressed air can be fired at the best firing interval possible.

Therefore, according to the cleaning apparatus according to claim 1 of the present invention, physical separation and removal of impurities such as scale are performed efficiently and completely even in one cleaning operation without performing the cleaning operation by dividing twice as in the conventional apparatus. Since it can be peeled off, workability can be improved significantly compared with the conventional apparatus, and internal cleaning of a water supply pipe etc. can be performed in a short time.

(2) According to claim 2, it is possible to sterilize the inside of the tube by injecting the chemical liquid into the tube by a chemical injection device while performing a cleaning operation to efficiently and completely remove impurities such as all scales generated in the tube. In that respect, in addition to the effect of claim 1, it is possible to prevent the generation of new slime into the tube.

1 is a schematic configuration diagram showing an example of the implementation of the cleaning apparatus according to claim 1 of the present invention.

2 is a schematic configuration diagram showing an example of implementation of a cleaning device having a chemical liquid injection device according to claim 2 of the present invention.

* Description of the symbols for the main parts of the drawings *

(1) -------------------- water pipe,

(2) -------------------- Supply hydrant.

(3) -------------------- Attachment Bracket,

(4) -------------------- two branch engine,

(5) -------------------- Drain Valve,

(6) -------------------- Return valve,

(7) -------------------- First solenoid valve,

(8) -------------------- second solenoid valve,

(9) -------------------- Branch,

(10) ------------------- First air ejection and stop timer,

(11) ------------------- Second air ejection and stop timer,

(12) ------------------- Timing adjustment timer,

(13) ------------------- Work Pause Timer,

(14) ------------------- Comprehensive work timer,

(15) ------------------- Compressor,

(16) ------------------- Storage tank,

(17) ------------------- Pressure adjusting valve,

(18) ------------------- Relay,

21 ------------------- 3 branch engines,

(22) ------------------- Return valve,

(A) -------------------- Cleaning device,

(B) -------------------- Chemical liquid injection device,

Claims (2)

A bifurcation engine 4 is provided through a mounting bracket 3 that can be freely attached to and detached from one of the water supply pipes 1 of the water supply pipe 1, and the discharge valve ( 5), the first and second electrons each having a storage tank 16 connected in parallel with the non-return valve 6 and communicating with the compressor 15 via the pressure adjusting knob 17 to the other connection port. The first and second valves 7 and 8 are disposed so that the amount of compressed air and its firing interval are changed to the first solenoid valve side 17 according to the opening time and closing time of the first solenoid valve 7 described above. The second air which connects the air blowing / stopping timer 10 and changes the compressed air and its firing interval on the second solenoid valve 8 side according to the opening time and closing time of the second solenoid valve 8 described above. The blowing and stopping timer 11 is connected, and the blowing and stopping timing of the air by the second air blowing and stopping timer 11 described above. The timing adjustment timer 12 and the first and second ejection / stop timers 10 and 11 which are variable with respect to the ejection / stop operation timing of the air by the first air ejection / stop timer 10 described above. The work pause timer 13 which firstly stops one cycle operation of blowing and stopping the air by the time of multiplying the number of times of the above timers by one cycle of blowing and stopping of the air, and the first and second air. A comprehensive work timer 14 for setting the total work time by a time obtained by multiplying the number of times of the ejection and stop timers by the idle time of the work pause timer 13, and stopping the operation after the set time has elapsed; In addition, the water supply pipe and the like, characterized in that the first and second air ejection and stop timers are provided with relays 18 and the like connected to the work stop timers to open and close the respective first and second solenoid valves. Internal cleaning unit. A three-way engine 21 is provided through a mounting bracket 3 that can be freely attached to one of the water supply pipes 2 of the water supply pipe 1, and discharged to one connection port of the three-way engine 21 described above. The first connecting port 5 is connected to the other connection port through an air side check valve 6 in parallel and in communication with the storage tank 16 connected to the compressor 15 via the pressure regulating valve 17. And the second solenoid valves 7 and 8 are disposed, and the compressed air and its firing interval are directed to the first solenoid valve 7 side according to the opening time and closing time of the first solenoid valve 7 described above. While the variable first air ejection / stop timer 10 is connected, the second solenoid valve 8 side is variable in accordance with the amount of compressed air and its firing interval according to the opening and closing times of the second solenoid valve 8 described above. The second air jetting / stopping timer 11 is connected, and the air jetting / stopping of the air by the second air jetting / stopping timer 11 is performed. A timing adjustment timer 12 that is variable with respect to the air ejection / stop operation timing of the air by the first air ejection / stop timer 10 described above, and the ejection / stop of each of the first and second air ejection / stop timers. The work pause timer 13 which first stops one cycle operation consisting of blowing and stopping the air by the time multiplied by the number of times of the above timers by one cycle consisting of the first cycle and the first and second blowing and stopping timers, respectively. A comprehensive work timer 14 for setting the total work time by the time multiplied by the number of times the work pause timer is multiplied by the above-mentioned number of times, and stopping the operation after the set time has elapsed; and the first and second air described above. The blower / stop timer is provided with a relay 18 or the like connected to the above-mentioned work pause timer 13 to open and close the respective first and second solenoid valves 7 and 8, and the above-described three minutes It is chemical liquid side station to the remaining connection of engine 21 An internal cleaning device such as a water supply pipe, characterized in that the chemical liquid injection device (B) is disposed through the flow preventing valve (22) and connected to the integrated work timer (14).