JP3340525B2 - Pipe cleaning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing scales and the like adhering to an inner wall of a pipe, which is connected to a liquid using apparatus such as a heat exchanger having a pipe through which a liquid flows. The invention relates to a device for cleaning a pipeline.

[0002]

2. Description of the Related Art As a water-using device having a pipe through which a liquid such as water flows, a wide variety of devices such as a mold having a cooling water circulation pipe and various heat exchangers are provided. In such a water-using device, water is circulated from a liquid inlet to an outlet of a pipeline to cool a mold whose temperature has risen due to casting or to perform heat exchange of water after use. It is common.

However, when water is circulated through the pipeline as described above, the flow direction of water in the water-using equipment is only one direction from the inlet to the outlet, so that the water circulation There is a problem that impurities such as scale adhere to the inner wall of the step portion of the joint and other bent portions (for example, elbows, bends, etc.) in the inside, and the impurities are deposited to narrow the flow path of water. When the water-using device is a device to be heated such as a mold, and a cooling water circulation pipe for cooling the device is formed therein, the vicinity of the cooling water inlet is sufficiently cooled. However, there is also a problem that the cooling water cannot be sufficiently cooled because the cooling water is sequentially heated toward the outlet. In the case of a device that is heated by circulating water in the opposite direction, the heating is sufficiently performed near the inlet but insufficiently performed near the outlet, resulting in a similar result.

[0004] In order to solve such inconveniences, for example, the present inventor has previously disclosed a "water flow switching device" in Japanese Utility Model Laid-Open No. 2-110770. According to this water flow switching device, the direction of flow of water in the water-using device is switched between the forward direction and the reverse direction, and impurities adhered by the flow of water in the forward direction are separated by the flow of water in the reverse direction. Even when cooling or heating water-using equipment with water, uniform cooling or heating can be achieved by reversing the inlet and outlet of the water. Further, when the flow direction of water is switched between normal and reverse in the water-using equipment, depending on the type of switching valve used for switching between the normal and reverse directions of the flow, there is a sudden change in the water flow at the time of switching, and a water hammer action occurs. However, in this water flow switching device, the inlet and outlet side selection valves provided in the water flow switching device constitute a leak mode in which the water inlet, outlet, and the first and second inlets and outlets communicate with each other, and are connected to the water use equipment. Water movement between the two, thereby preventing water hammer.

[0005]

In the above-mentioned water flow switching device, there is no problem in terms of performance with respect to removing impurities, uniform cooling or heating effect, and prevention of water hammer effect. When impurities adhering to the inner wall accumulate over time, there is a disadvantage that the accumulated impurities cannot be sufficiently peeled off simply by switching the flow direction of water.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned disadvantages, and has as its object to switch the liquid forward and reverse, and to inject gas into the liquid to promote the formation of bubbles in a pipe, It is an object of the present invention to provide a pipe cleaning apparatus capable of satisfactorily cleaning the inner wall of the pipe by the impact of the collapse of the air bubbles.

[0007]

According to a first aspect of the present invention, there is provided:
The conduit cleaning device is connected to the valve body, to the source of liquid
An inlet and an outlet connected to the destination of the liquid, and these inlets and
To the outlet and to the equipment that uses the liquid to be cleaned.
First and second inlets and outlets, and a flow of liquid entering from the inlet.
The direction of the first entrance and the second entrance and both
And an inlet-side selection valve to select one of
The first port and the second port serve as passages for the flow of the liquid.
Exit side selection to choose between the inlet and both of them
And a first port of said inlet side selection valve.
The outlet side selection valve selects the second inlet and outlet when selected.
At the time of selecting the second entrance and exit of the entrance side selection valve.
Select valve switches to backflow mode to select first entrance
An opening / closing switching mechanism is provided, and the liquid supply source and the
An injection mechanism for injecting gas into the flow path between
It is characterized by

[0008]

[0009]

According to the present invention , a liquid is supplied to the inlet of a cleaning device.
Liquid from the source, which is first and second
Connect one of the inlets to one of the two
After circulating here and performing predetermined work,
Exit from the other entrance of the cleaning equipment and the other entrance of the cleaning device
And the liquid exits further at the outlet of the cleaning device. This
At the time, in the flow path between the liquid supply source and the inlet side selection valve,
Gas is injected into the liquid by the injection mechanism.

Here, the entrance side selection is performed by the open / close switching mechanism.
Select valve selects first inlet / outlet and outlet select valve selects second inlet / outlet
When you select the mouth and enter the normal flow mode,
Enter the liquid from the first inlet and outlet of one of the liquid-using devices.
Is supplied to the mouth and circulates through the equipment that uses the liquid.
Enter the second entrance to the washing device from the entrance, and from the exit
leak. Next, the inlet side selection valve is
When the inlet and outlet are selected and set to the reverse flow mode, the cleaning
Liquid entering through the mouth flows directly from the second port to the liquid-using equipment
In the mode, the liquid is supplied to the entrance, which was the exit, and the liquid
Circulates through the body-using device, exits through the other
Enters the first entrance and then exits through the exit
You.

Thus, the normal flow mode and the reverse flow mode
In and out, the liquid entry and exit directions at the first and second entrances are reversed
The flow direction of the liquid in the equipment using liquid to be cleaned is reversed.
The liquid inlet and outlet are reversed
become. For this reason, scales and other deposits on the inner wall of the pipeline
Pure matter is removed by reverse liquid flow and
At the same time, gas bubbles in the liquid
Generation is promoted, and the shock generated when the bubbles collapse
Therefore, after the impurities deposited on the inner wall of the pipeline are peeled off,
It is discharged outside the body use equipment.

[0012] The generation and destruction of bubbles are rapidly repeated.
The elephant (so-called cavitation) is the flow pressure
Where the force is extremely reduced, e.g. static pressure acting on the liquid
And the pressure drop due to the flow velocity of the liquid flowing through the flow path
If there are parts that occur simultaneously at the same time, this part
The liquid boils instantaneously and produces air bubbles.
Bubbles can be transported to higher pressure areas and destroyed.
Is a dynamic phenomenon,
At a very high speed of about 1/1000 second
It has been confirmed that there is. In addition, liquid
More or less various substances are dissolved, but especially gas
When dissolved, cavitation is accelerated.
Tend to

In addition, the equipment using the liquid is cooled or cooled by the liquid.
When heated, the liquid inlet and outlet are reversed and reversed
The temperature of the pipeline becomes uniform,
Cooling or heating is performed uniformly.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a circuit diagram showing an outline of the present invention. Reference numeral 1 denotes a cleaning device. A mold, an oil cooler and other water-using equipment 2 are connected to the cleaning device 1 to form a reciprocating circulation device. Have been.

The cleaning device 1 is connected to an inlet 4 which is connected to a water supply source 3 via a pump P to a valve main body which is virtually shown by a dashed line in FIG. In the example, it is provided with an outlet 5 and a first inlet 6 and a second inlet 7 communicating with the inlet 4 and the outlet 5 and connected to the water use equipment 2. Further, a filter 8 is interposed between the outlet 5 and the supply source 3. In addition, the said pump P may be another position as long as the water pressure for a water flow can be obtained.

Further, in the valve body, the direction of the water flow entering from the inlet 4 is interposed between the inlet 4 and the first and second inlets 6 and 7, and the direction of the first inlet 6 and the second Doorway 7,
A motor-operated inlet-side selection valve A for selecting either one of these outlets 6 and 7 is provided, and the outlet 5 is interposed between the outlet 5 and the first and second inlets and outlets 6, 7. As a passage part of the water flow toward 5, a first entrance 6, a second entrance 7,
A motor-operated outlet-side selection valve B for selecting either one of these 6 and 7 is provided. These inlet side selection valves A
And the opening and closing of the outlet side selection valve B are in opposite phases to each other, and the opening and closing operations of both selection valves A and B are synchronized. The synchronous operation in the opposite phase is performed by the open / close switching mechanism 9.

The open / close switching mechanism 9 employs an automatic switching mechanism using an electric motor M in this embodiment.
The operation unit includes a power button for turning on and off the power of the motor M, and a water flow switching mode for opening and closing the inlet side selection valve A and the outlet side selection valve B based on the setting of a water flow switching timer built in the opening / closing switching mechanism 9. And a changeover switch for switching between an OFF mode for stopping the opening / closing operation of the inlet-side selection valve A and the outlet-side selection valve B, and a washing mode for activating the injection mechanism described later, and a predetermined device based on the mode of the changeover switch. A start button for starting and a stop button for stopping the start are provided, and a forward flow lamp, a reverse flow lamp for lighting forward and reverse directions of the water flow based on opening and closing of the inlet side selection valve A and the outlet side selection valve B, and a motor M An abnormal lamp or the like that is turned on when an abnormality occurs is provided, and a first setting unit that sets the water flow switching timer and a second setting unit that sets an impact timer of an injection mechanism described later. Tough is provided. Note that other functions may be added to the operation unit as needed.

A mixing pipe 21 is provided between the inlet 4 and the inlet-side selection valve A as a part of a pipe connecting them.
Is installed in the mixing tube 21.
Is connected. The injection mechanism 22 is for injecting gas toward the water that has entered through the inlet 4, and a detailed exploded view thereof is shown in FIG.
A check valve 22 is connected to the check valve 22, a miniature valve 23 is connected to the check valve 22, an electromagnetic valve 26 is connected to the miniature valve 23 via a joint 24 and a tube 25, and a gas The supply source 27 is connected. Of these components, the solenoid valve 26
Has a built-in impact timer (not shown), and the impact timer causes the solenoid valve 26 to open and close intermittently. The setting of the impact timer is performed by the second setting unit, and the set time is determined based on conditions such as the diameter of the pipeline and the flow rate of water flowing through the pipeline.

On the other hand, the first port 16 and the second port 17 formed at both ends of the water circulation line 15 in the water use equipment 2 are provided with the first port 6 and the second port 7 of the cleaning device 1. Are individually connected by joints not shown in FIG. Next, a method for cleaning the inside of the circulation line 15 in the water-using equipment 2 using the cleaning device 1 configured as described above will be described.

First, after setting the time of the water flow switching timer and the impact timer in the first and second setting units, the changeover switch of the operation unit of the open / close switching mechanism 9 is set to the water flow switching mode. As a result, the pump P sends water from the supply source 3 to the cleaning device 1, and water entering the inlet 4 is supplied to the inlet-side selection valve A.
One of the outlet A ₁ and opens the other inlet B ₂ of the outlet-side selection valve B is, and one of the inlet B ₁ and is closed in the other outlet A ₂ and the outlet-side selection valve B of the inlet-side selection valve A of Is in the normal flow mode in which the inlet side selection valve A selects the first port 6 and the outlet side selection valve B selects the second port 7,
Water flows as shown in FIG. That is, the first doorway 6
From the water inlet / outlet 16 of the water use equipment 2 through the circulation line 1
After circulating 5 in the direction of arrow X and exiting from the second entrance 17, it enters the second entrance 7 of the cleaning device 1 and exits from the exit 5,
It returns to the source 3 via the filter 8.

Here, based on the setting of the water flow switching timer,
The opening and closing of the inlet-side selection valve A and the outlet-side selection valve B was reversed, and the inlet-side selection valve A selected the second port 7 and the outlet-side selection valve B selected the first port 6. In the case of the backflow mode, as shown in FIG. 3, the water flows out of the second port 7 of the washing device 1 and enters the second port 17 of the water use equipment 2 as shown in FIG. And the first entrance 16
From the first inlet / outlet 6 of the cleaning device 1 and further out of the outlet 5. Therefore, the switching direction between the inlet side selection valve A and the outlet side selection valve B by the open / close switching mechanism 9 reverses the circulation direction of the water-using equipment 2 in the circulation pipeline 15.

In this case, when the mode is switched between the normal flow mode and the reverse flow mode, the mode becomes the leak mode during the switching, and the water flows as shown in FIG. That is, the water that has entered from the inlet 4 flows out from both the outlet A ₁ and the outlet A ₂ of the inlet-side selection valve A, and the water that has flowed out from the outlet A ₁ does not flow to the first inlet / outlet 6, but the outlet-side selection valve B It flows to the inlet B _1,
And water flowing out from the outlet A ₂ flows to the inlet B ₂ of the outlet-side selection valve B without flow into the second fluid inlet and outlet 7, exits the outlet 5 by circulating only cleaning device 1. At this time, water use equipment 2
Does not reciprocate, and the water temporarily stops in the circulation line 15, so that the water hammer action by the switching does not occur.

Here, when the changeover switch of the operation section is set to the washing mode, the impact timer also operates while the water flow switching timer operates, and the electromagnetic valve 26 operates intermittently based on the setting of the impact timer. That is, the gas is supplied from the gas supply source 27 to the electromagnetic valve 26, and the gas is intermittently sent from the electromagnetic valve 26 to the mixing pipe 21. At this time, the pressure at which the gas is sent is higher than the pressure of the water flowing through the pipeline. The gas may be air, carbon dioxide gas, nitrogen gas or any other gas that does not involve any danger. In general, it is preferable to use inexpensive and simple air.

When a gas is injected into the water in this manner, the gas activates the molecular motion of the water, so that even when the temperature of the water at that time is low, bubbles are easily generated. When the water in this state is caused to flow at predetermined intervals in the normal flow mode and the reverse flow mode, water flowing in the normal flow mode,
Next, a pressure difference is generated at the boundary with the water flowing in the reverse flow mode, and the molecular motion of water is activated by gas injection at the tip of the water flowing in the reverse flow mode. Cavitation occurs at the tip of the water. Due to this cavitation, that is, the continuous generation and destruction of air bubbles, a physical impact is applied to the inner wall of the circulating conduit 15, and impurities (such as scale) attached to the inner wall are separated and the flow is reversed. The impurities are also removed by the increase in water resistance due to
The inner wall will be well cleaned. Further, as described above, when the flow is switched, the mode is set to the leak mode, and the water in the circulation conduit 15 is temporarily stopped, and the water after the flow direction is switched forms bubbles at the tip of the flow. Since it moves in the circulation line 15 while repeating its destruction, cavitation occurs uniformly throughout the circulation line 15, and the inner wall of the circulation line 15 is washed evenly.

As described above, water is circulated in the forward flow mode and the reverse flow mode, the formation of bubbles is promoted by the pressure difference generated at the tip of the flow of water after switching the mode, and air is injected into the water. As a result, the formation of bubbles is further promoted, so that impurities adhering to the inner wall of the circulation pipe 15 are separated by a physical impact generated when the bubbles are destroyed, and the resistance of water is increased by reversing the flow. Impurities can be removed. Therefore, impurities that could not be sufficiently removed by simply switching the flow direction of the water can also be removed, and the inner wall of the circulation conduit 15 can be cleaned and maintained satisfactorily. Furthermore, even when the water use equipment 2 is to be cooled or heated by water, the inlet and outlet of the water are reversed and reversed so that the temperature of the circulation line 15 becomes uniform, and thus the cooling or heating is performed. Heating can be performed uniformly.

It should be noted that any well-known switching valve can be applied to the inlet-side selection valve A and the outlet-side selection valve B described in the present embodiment to obtain the effect. Alternatively, it is of course possible to configure the outlet-side selection valve B with two valve devices. For example, if a three-way piston valve (for example, “Rocky Valve” (trade name) sold by Rix Co., Ltd.) is used, There are the following advantages. In other words, this rocky valve uses steam, gas,
Pneumatic ON-OF applicable to water, hot water and other fluids
As shown in FIG.
A disk ring 32 made of a special synthetic resin is provided at the tip of 1 to ensure a good sealing function. Since the seal packing 34 of the cylinder portion 33 is formed of a special resin packing, it is not necessary to supply lubricating oil. The heat resistance is improved, and a dust seal 36 and a ring washer 37 are provided in the gland portion 35 to prevent external dust and scale from a fluid from adhering to the stem 31 and improve the life of the gland packing 38. And the like. Therefore, the present invention can be applied to a case where a high-temperature liquid (about 200 ° C.), which cannot be handled by a normal valve, flows, and the stem 31 moves forward and backward by the air pressure to open and close. It is possible to always achieve good valve switching without causing an abnormality. According to such a three-way piston valve, the manufacturing and other economics are improved, and the entire cleaning device 1 can be made compact.
For example, it can be installed as an option in each of the water-using devices 2.

[0027]

As is apparent from the above description , according to the pipe cleaning apparatus of the present invention, the normal flow mode and the reverse flow mode are used.
In the first and second entrances, the directions of liquid flow in and out are reversed
The flow direction of the liquid in the liquid-using equipment is reversed,
The conventional liquid inlet and outlet are reversed by
Impurities such as scale deposited by steps or bends in the pipeline
Is removed by the liquid flow in the opposite direction and
Of gas bubbles in liquid by gas injected from inlet mechanism
Is promoted, and the shock generated when the bubble collapses
Removes impurities from the inner wall of the circulating pipeline and ensures good cleaning of the pipeline.
Can be manifested. In addition, liquid-using equipment may be
Liquid inlet and outlet are repeated even when cooling or heating
The temperature of the circulation line becomes uniform.
Cooling and heating can be uniform
You.

[0028]

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of a cleaning apparatus according to the present invention.

FIG. 2 is an explanatory diagram showing a flow path of water in a normal flow mode.

FIG. 3 is an explanatory diagram illustrating a flow path of water in a reverse flow mode.

FIG. 4 is an explanatory diagram showing a flow path of water in a leak mode.

FIG. 5 is a detailed exploded view showing an injection mechanism according to the present invention.

FIG. 6 is a half sectional view of the three-way piston valve described in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Washing apparatus 2 Liquid use equipment 3 Supply source 4 Inlet 5 Outlet 6 First entrance 7 Second entrance 9 Opening / closing switching mechanism 15 Circulation line 22 Injection mechanism A Inlet side selection valve B Outlet side selection valve

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B08B 9/027 B08B 9/06

Claims (1)

(57) [Claims] An inlet connected to a source of liquid is provided in the valve body.
And an outlet connected to the liquid discharge destination, and these inlets and outlets.
The second outlet communicates with the mouth and is connected to the liquid-using equipment to be cleaned.
First and second inlets and outlets of the liquid flowing from the inlets;
Orientation of the first entrance and the second entrance and both of them
Select the inlet side selection valve to either and go to the outlet
The first port and the second port as passages for liquid flow
And an outlet-side selection valve to select either of these and
And selecting the first entrance / exit of the entrance-side selection valve.
Positive flow mode in which the outlet side selection valve sometimes selects the second inlet / outlet
The outlet side is selected when the second inlet / outlet of the inlet side selection valve is selected.
Open to switch to backflow mode where valve selects first inlet / outlet
Providing a closing switching mechanism, further comprising the liquid supply source and the inlet
An injection mechanism is provided to inject gas into the flow path between the side selection valve
An apparatus for cleaning a pipeline.