KR101435986B1 - Pipe cleaning apparatus using shock wave - Google Patents

Abstract

[0001] The present invention relates to a pipe cleaning apparatus using an air pressure shock wave, and more particularly, to an apparatus for cleaning a pipe by supplying air pressure shock waves in a short- Or a slime or the like, which is deteriorated.
The present invention relates to a piping system in which a piping 10 connected to one end of a boiler or a heat exchanger that requires cleaning is provided with a supply pipe 61 to which a cleaning liquid is supplied and a cleaning liquid to be recovered through the supply pipe 61 and the pipe 10, A chemical tank 60 having a recovery pipe 62 connected to the other end of the chemical tank 10; A supply valve (21) and a shutoff valve (22) provided between the supply pipe (61) and the return pipe (62) for controlling the supply and shutoff of the rinse solution; A pump (40) interposed between the supply pipe (61) and the chemical tank (60) to pump the cleaning liquid contained in the chemical tank (60); A compressor (50) generating an air pressure shock wave so that the cleaning liquid pumped through the pump (40) shorts the inside of the pipe (10); A control unit 30 for controlling the operation of the compressor 50 and the opening and closing of the supply valve 21 and the shutoff valve 22; And a boiler (70) for heating a cleaning liquid of the chemical tank (60), wherein the cleaning liquid is mixed with water and a cleaning agent in a ratio of 9: 1, the cleaning agent is nitric acid (40% dilute nitric acid), and the compressor blows air pressure to the piping at 0.5 to 0.7 MPa to circulate the cleaning liquid, and the supply valve and the shutoff valve are short-circuited at intervals of 0.1 to 1.0 sec. do.

Description

TECHNICAL FIELD [0001] The present invention relates to a pipe cleaning apparatus using a pneumatic shock wave,

[0001] The present invention relates to a pipe cleaning apparatus using an air pressure shock wave, and more particularly, to an apparatus for cleaning a pipe by supplying air pressure shock waves in a short- Or a slime or the like, which is deteriorated.

In the field of industry or buildings, equipment such as boiler or heat exchanger is essentially used. Coil or piping are combined in these facilities. As the use period passes, scale is generated in the inside, and the thermal efficiency is lowered The cost is increased.

The pipe, which is installed to flow the fluid including the hot water, has a scale or a slime formed therein due to corrosion due to oxidation or various foreign substances contained in the fluid, A phenomenon occurs.

When a scale or a slime is formed on the inner surface of the pipe for flowing the fluid, the inner diameter of the pipe is gradually narrowed, thereby causing the channel to be shrunk, which causes the smooth flow of the fluid in the pipe to be disturbed, If the degree of disturbance of the fluid flow by the scale or slime is increased, the pressure of the fluid increases, and the possibility that the piping ruptures or is adversely affected is also increased.

Therefore, it is preferable to remove the scale or slime formed in the pipe by applying a proper method or means. For example, the method is a method of removing chemicals by injecting a chemical into the pipe and reacting with the scale. When the scale is to be removed, it is necessary to use a tack-free chemical (for example, hydrochloric acid or the like) depending on the composition of the scale, or a cleaning water is supplied to wash the chemical in the pipe after the scale is removed by injecting the chemical There is a high possibility that environmental pollution is involved because additional washing has to be carried out.

Another example of piping cleaning is a method of removing the scale inside the piping by rotating the flexible wire by an electric motor. In the case of removing the scale (or slime) inside the piping by using the flexible wire, The entire structure including the electric motor, the flexible wire rotating by the electric motor, and the wire housing for housing the flexible wire are complicated, and the electric motor and the flexible wire are operated to clean the pipe, The operation for removing the scale (or slime) of the substrate is relatively complicated.

Another example is a method in which ultrasound waves (for example, 25 to 30 KHz) are emitted to a pipe by using an ultrasonic vibrator to continuously apply minute vibrations to the water in the pipe to clean the pipe. In this case, Therefore, it can be used only within a limited range of ultrasound, which limits the scope of application.

Therefore, there is a need for a method or a method that satisfies the structural aspects of the apparatus, the workability, and the efficiency without causing environmental pollution for cleaning the piping.

Published patent 10-2012-94586

Disclosure of the Invention The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a method and a device for generating compressed air in a pipe through which water or a chemical flows, And it is an object of the present invention to provide a piping cleaning device using an air pressure shock wave that can easily separate foreign substances such as a large scale attached to the inside.

In order to accomplish the above object, the present invention provides a cleaning apparatus for a washing machine, comprising a supply pipe (61) connected to one end of a pipe (10) installed in a boiler or a heat exchanger requiring cleaning, a cleaning liquid supplied to the supply pipe (61) A chemical tank (60) having a recovery pipe (62) connected to the other end of the pipe (10) so as to be recovered through the pipe A supply valve (21) and a shutoff valve (22) provided between the supply pipe (61) and the return pipe (62) for controlling the supply and shutoff of the rinse solution; A pump (40) interposed between the supply pipe (61) and the chemical tank (60) to pump the cleaning liquid contained in the chemical tank (60); A compressor (50) generating an air pressure shock wave so that the cleaning liquid pumped through the pump (40) shorts the inside of the pipe (10); A control unit 30 for controlling the operation of the compressor 50 and the opening and closing of the supply valve 21 and the shutoff valve 22; And a boiler (70) for heating a cleaning liquid of the chemical tank (60), wherein the cleaning liquid is mixed with water and a cleaning agent in a ratio of 9: 1, the cleaning agent is nitric acid (40% dilute nitric acid), and the compressor blows air pressure to the piping at 0.5 to 0.7 MPa to circulate the cleaning liquid, and the supply valve and the shutoff valve are short-circuited at intervals of 0.1 to 1.0 sec. do.

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According to the piping cleaning apparatus using the pneumatic shock wave of the present invention, first, the chemical reaction with the scale is increased by the physical stirring effect by simultaneously emitting the pneumatic shock wave with the cleaning liquid contained in the chemical tank and the compressor, It is possible to exert a cleaning effect of 5 times or more as compared with the existing method.

Second, the speed of the fluid is slowed down by the shortage of compressed air. If the velocity of the fluid flows fast, the inner surface of the piping lowers the pressure due to the cavitation effect, and when the flow is slow, Since the pressure is increased and decreased repeatedly, the scale can be easily removed.

Third, the use of cleaning agent is reduced to 1/2, the cleaning time is reduced to 3 to 4 hours, and the cleaning effect is increased up to 5 times. Therefore, the working time is reduced, the cleaning cost is reduced, .

Fourthly, it removes various foreign substances from the construction process of boiler heat exchanger refrigerator cleaning of apartment buildings, high-rise buildings, factories, etc., construction of new buildings or platforms, eliminates foreign substances in semiconductor, electronics, food and beverage factory production line, It can be widely used in various fields because it can clean bacterial bacteria, foreign matter, and unpleasant odor generated in aged water pipes when the water pressure is low due to the washing of the water pipe and the generation of the foreign substances in the pipe.

1 is a schematic view schematically showing a piping cleaning apparatus using pneumatic shock waves according to the present invention.
FIG. 2 is a view showing a state before and after washing the inside of a pipe using a piping cleaning device using the pneumatic shock wave of the present invention. FIG. 2 (a) Fig.
FIG. 3 is a view showing a state before and after the inside of a pipe is cleaned by using a piping cleaning device using the pneumatic shock wave of the present invention. FIG. The cleaning liquid and the shock wave are supplied and cleaned.
FIG. 4 is a view showing a state before and after the inside of a pipe is cleaned by using a piping cleaning device using the pneumatic shock wave of the present invention. FIG. 4A is a view showing a state before the inside of the pipe is cleaned, 10% cleaning liquid and shock wave were fired 25 times for 5 seconds every 0.2 seconds.
FIG. 5 is a view showing a state before and after the inside of a pipe is cleaned using a piping cleaning device using the pneumatic shock wave of the present invention. FIG. 5A is a view showing a state before the inside of the pipe is cleaned, 10% cleaning liquid and shock wave were fired 9 times for 5 seconds every 0.6 seconds.
FIG. 6 is a view showing a state before and after washing the inside of a pipe by using a piping cleaning device using the pneumatic shock wave of the present invention. FIG. 6A is a view showing a state before the inside of the pipe is cleaned, 10% cleaning liquid and shock wave were fired 5 times for 5 seconds every 1 second.

For a better understanding of the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the elements in the drawings can be exaggeratedly expressed to emphasize a clearer description. It should be noted that in the drawings, the same members are denoted by the same reference numerals. Further, detailed descriptions of well-known functions and configurations that may be unnecessarily obscured by the gist of the present invention are omitted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings, and a piping cleaning apparatus using the pneumatic shock wave of the present invention will be described in detail.

1 is a schematic view schematically showing a piping cleaning apparatus using pneumatic shock waves according to the present invention.

Referring to FIG. 1, the pipe cleaning apparatus using the pneumatic shock wave according to the present invention is applied to a pipe 10 installed in a boiler or a heat exchanger, and is connected to one end of the pipe 10, And a chemical tank 60 connected to the other end of the pipe 10 for recovering the cleaning solution through the supply pipe 61 and the pipe 10.

The diameter of the pipe 10 is applied to a device such as a boiler or a heat exchanger, and the diameter of the pipe 10 is preferably about 10 to 100 mm.

In addition, the chemical tank is provided with a cleaning liquid circulating inside the pipe 10, and the cleaning liquid is preferably mixed with water and a detergent solution in a ratio of 9: 1. In addition, it is preferable that nitric acid (40% diluted nitric acid), which is an organic acid, is used as the cleaning agent raw solution.

Conventionally, a strong acid which is about 50% hydrochloric acid has been used. However, when diluted with 10% of nitric acid (40% diluted nitric acid) which is an organic acid as described above, washing wastewater can be minimized and environmental pollution can be prevented. It is used in combination with the pneumatic shock wave, so that the excellent cleaning effect can be raised.

In addition, a boiler 70 may be provided at one side of the chemical tank 60 to heat the solidified cleaning liquid or the cleaning liquid.

On the other hand, a supply valve 21 and a shut-off valve 22, which are provided in the middle of the supply pipe 61 and the return pipe 62 to control supply and interruption of the rinsing liquid, are provided. The supply valve 21 and the shutoff valve 22 are preferably constituted by solenoid valves.

A pump 40 interposed between the supply pipe 61 and the chemical tank 60 for pumping the cleaning liquid contained in the chemical tank 60; and a cleaning liquid pumped through the pump 40 in a short- A compressor 50 that generates an air pressure shock wave so as to impact the inside of the pipe 10 and a control unit 30 that controls the operation of the compressor 50 and the opening and closing of the supply valve 21 and the shutoff valve 22 do.

The control unit 30 controls the air discharge pressure of the compressor 50 and the opening and closing intervals of the supply valve 21 and the shutoff valve 22. The compressor 50 is installed in the piping 10 at 0.5 to 0.7 MPa to circulate the cleaning liquid, and the supply valve 21 and the shutoff valve 22 are set to be short-circuited at intervals of 0.1 to 1.0 sec.

The setting value is set differently according to the diameter, length of the pipe 10, and thickness of the scale accumulated in the pipe 10, and details will be described with reference to experimental examples to be described later.

Hereinafter, a cleaning experiment of the pipe through the piping cleaning device using the pneumatic shock wave of the present invention will be described.

Prior to the experiment, the experimental conditions will be discussed.

The cleaning effect of the piping cleaning device using the pneumatic shock wave differs depending on the pressure of the pneumatic shock wave and the cycle of the shock wave. Therefore, the pneumatic shockwave cleaning device was experimented and tested to find the cycle of the shock wave that can effectively remove the scale in the circulation pipe. The air pressure of the shock wave was fixed at 0.6MPa, and the focus was on finding the cleaning effect according to the shock wave period. A transparent acrylic piping system to be connected to the pneumatic shock wave cleaner was made of PVC pipe to visually confirm the cleaning effect. In order to create the scale of the piping for the experiment, a certain thickness was created in the transparent piping by using the gypsum and talc powder similar to the scale component of the actual piping. Experiments were carried out using several shock wave cycles. The washing power was determined by the weight of the desorbed scale.

All the experiments were carried out for 10 minutes using a 10% concentration cleaning solution while maintaining the same flow rate (120 L / min) and temperature (15 ㅀ C), and the cleaning force was determined by measuring the weight of the washed scale.

의 식을 이용하여 구하였으며, 여기서 T는 실험 전 아크릴 관 내 스케일 량(g)이고, r은 세척 후 아크릴 관 내 남아있는 량(g)이다.
The cleaning effect

, Where T is the scale amount (g) in the acrylic tube before the experiment, and r is the remaining amount (g) in the acrylic tube after washing.

Hereinafter, the experimental procedure will be described.

1. Mix talc and gypsum in a ratio of 1: 3, add some water, stir and thicken.

2. Apply a thin layer of the mixture prepared in item 1 above to the inside of the transparent acrylic tube.

3. After drying for about a day, connect the PVC piping system with rubber pads so that no water leaks.

4. Fill a water tank with 18 liters of water and 2 liters of cleaning agent (nitric acid (40% diluted nitric acid)) at a ratio of 9: 1 (cleaning solution concentration 10%).

5. Pneumatic Shock Wave Cleaning The inlet of the pump in the experimental unit is connected to the water tank and the outlet is connected to the PVC piping system by high pressure hose.

6. Connect the power supply of the pneumatic shock wave cleaning experiment device and circulate the cleaning liquid in the water tub to the PVC piping system with the pump.

7. The air-discharge pressure of the compressor is fixed at 0.6 MPa.

The pneumatic shock wave and the cleaning liquid are supplied to the piping set in the above-described order, and the results will be described below.

FIG. 2 is a view showing a state before and after washing the inside of a pipe using a piping cleaning device using the pneumatic shock wave of the present invention. FIG. 2 (a) FIG. 3 is a view showing a state before and after washing the inside of a pipe using a piping cleaning device using the pneumatic shock wave of the present invention, and FIG. 3 And FIG. 3B is a view showing a state after cleaning by supplying a cleaning liquid and a shock wave.

The experimental results shown in FIGS. 2 and 3 were performed through the following three methods.

1) Circulate water without washing solution for 10 minutes without shock wave.

2) Use a shockwave to circulate the untreated water for 10 minutes.

3) Proceed in the same way as 1) and 2) above.

As a result of the experiment under the same conditions, the cleaning effect was not observed in the case 1) in which the cleaning liquid was not used. Even in the case of the experiment 2) in which the shock wave was applied without using the cleaning liquid, there was no cleaning effect (not shown).

In the case of 3) in which the shock wave was not used, there was a slight cleaning effect as shown in FIG. 2B (red circle portion) when circulating the cleaning liquid for 10 minutes. About 7g of the 75g scale generated in the transparent piping was removed and the cleaning effect was 9.3%.

When the shock wave was suitably used in the experiment 3), a considerable cleaning effect was shown as shown in FIG. 3B. Therefore, it was found that the scale in the pipe can be easily removed by mixing the cleaning liquid and the pneumatic shock wave.

Hereinafter, when the pneumatic shock wave and the rinse liquid are simultaneously supplied during the experiment of the above 3), the pneumatic shock wave was further limited under the following conditions.

Shooting time of the pneumatic shock wave is fixed to 5 seconds and the pulse period is set to three conditions as shown in Fig. 4, 0.6 second (Fig. 5) and 1 second (Fig. 6).

FIG. 4 is a view showing a state before and after the inside of a pipe is cleaned by using a piping cleaning device using the pneumatic shock wave of the present invention. FIG. 4A is a view showing a state before the inside of the pipe is cleaned, 10% cleaning liquid and shock wave were fired 25 times for 5 seconds every 0.2 seconds.

FIG. 5 is a view showing a state before and after the inside of a pipe is cleaned using a piping cleaning device using the pneumatic shock wave of the present invention. FIG. 5A is a view showing a state before the inside of the pipe is cleaned, 10% cleaning liquid and shock wave were fired 9 times for 5 seconds every 0.6 seconds.

FIG. 6 is a view showing a state before and after washing the inside of a pipe by using a piping cleaning device using the pneumatic shock wave of the present invention. FIG. 6A is a view showing a state before the inside of the pipe is cleaned, 10% cleaning liquid and shock wave were fired 5 times for 5 seconds every 1 second.

From the results of the above tests, it was found that when the washing liquid was not used, the washing effect was not exhibited even when the shock wave was added. When the washing liquid having a dilute concentration was used, the shock wave was necessary to remove the scale. Of course, this is the result of 10% concentration of the cleaning liquid. Therefore, it is necessary to use a cleaning liquid having a high concentration in order to obtain a cleaning effect in the circulation system of only the cleaning liquid, which was the previous cleaning method, and the cleaning time was long I could. In the conventional cleaning method, hydrochloric acid, which is a strong acid with a concentration of about 50%, was used to obtain a cleaning effect. However, nitric acid (40% diluted nitric acid) (organic acid) having low toxicity was used as a cleaning agent used in the present invention. . As a result, it has been confirmed that the use of a low concentration cleaning liquid, which is an important goal of the present invention, can reduce the generation of washing wastewater and improve the cleaning efficiency by adding shock waves. In the case where the cycle of the shock wave was short (0.2 sec, see FIG. 4B), the cleaning efficiency was the highest, showing 47.36%. In the case of 0.6 second and 1 second having relatively long periods, 23.43% and 24.07% ) Showed similar efficiency.

It was found that the optimum period can be determined depending on the diameter of the pipe and the length of the pipe in the above experimental example. It was found that the shorter the pipe length, the shorter the shock wave period, the greater the efficiency.

Therefore, when the shock wave was used, the maximum cleaning efficiency was 47.36%, and when the shock wave was not used, the cleaning efficiency was 9.3%. Therefore, the pneumatic shock wave cleaning device of the present invention had a cleaning effect of about 5.09 times As well. In addition, it can be seen that the cleaning liquid also uses nitric acid (40% diluted nitric acid), which is an organic acid having a small harmful effect on the human body, and reduces the concentration to about 10%, thereby minimizing the washing wastewater.

The following table shows the use period of the shock wave according to the piping length and pipe diameter through the various experimental results of the present invention. Such data can be used as useful data for actual pipe cleaning (unit: sec).

Pipe diameter / length 100m or less 100 ~ 500m 500m or more
20 mm or less Shooting 2 3 4 Stopping 3 4 5 Pulse 0.2 0.3 0.4 Delay 0.2 0.3 0.4
20 to 50 mm Shooting 3 4 5 Stopping 4 5 6 Pulse 0.35 0.45 0.55 Delay 0.35 0.45 0.55
50 to 100 mm Shooting 4 5 6 Stopping 5 6 7 Pulse 0.5 0.6 0.7 Delay 0.5 0.6 0.7
100mm or more Shooting 5 6 7 Stopping 6 7 8 Pulse 0.6 0.7 0.8 Delay 0.6 0.7 0.8

Through such data, it is possible to exert a high cleaning effect by appropriately adjusting the pipe cleaning apparatus using the pneumatic shock wave according to the present invention.

The embodiments of the pipe cleaning apparatus using the pneumatic shock wave of the present invention described above are merely illustrative and those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. You will know the point. Therefore, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

10: piping 21: supply valve
22: shutoff valve 30:
40: Pump 50: Compressor
60: chemical tank 61: supply pipe
62: recovery pipe 70: boiler

Claims (6)

The pipe 10 is connected to one end of a pipe 10 installed in a boiler or a heat exchanger which needs to be cleaned so that a pipe 61 for supplying the cleaning liquid is recovered and the cleaning liquid is recovered through the pipe 61 and the pipe 10. [ A chemical tank 60 having a recovery pipe 62 connected to the other end of the chemical tank 60; A supply valve (21) and a shutoff valve (22) provided between the supply pipe (61) and the return pipe (62) for controlling the supply and shutoff of the rinse solution; A pump (40) interposed between the supply pipe (61) and the chemical tank (60) to pump the cleaning liquid contained in the chemical tank (60); A compressor (50) generating an air pressure shock wave so that the cleaning liquid pumped through the pump (40) shorts the inside of the pipe (10); A control unit 30 for controlling the operation of the compressor 50 and the opening and closing of the supply valve 21 and the shutoff valve 22; And a boiler (70) for heating the cleaning liquid of the chemical tank (60), the pipe cleaning apparatus using a normal pneumatic shock wave,
The cleaning liquid is mixed with water and a detergent in a ratio of 9: 1, the detergent is nitric acid (40% diluted nitric acid)
Wherein the compressor blows air pressure to the piping at 0.5 to 0.7 MPa to circulate the cleaning liquid, and the supply valve and the shutoff valve are short-circuited at intervals of 0.1 to 1.0 sec. . delete delete delete delete delete

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