JPH02230000A - Flushing device for interior of piping - Google Patents

Abstract

PURPOSE:To facilitate removal of a foreign matter in a conveyance piping for liquid, e.g. lubricating oil, by a method wherein a compressed gas injection piping having a solenoid valve is connected to the upper stream side of a main piping, the flow rate control valve of the main piping is located on the upper stream side of the main piping at a connection part therebetween, and when the velocity of flow of the main piping is decreased, intermittent injection of compressed gas is effected. CONSTITUTION:In order to remove a residual foreign matter in a piping after installation of an oil feed pipe 7, lubricating oil in a vacuum tank 4 is forced to flow to an oil feed pipe 7 end a temporarily-mounted strainer 8 with the aid of an oil pump 5. A part of lubricating oil entering a bearing chamber 9 flows through an inner return oil pipe 10, an enlargement layer 11, and a float trap chamber 14 and back to the vacuum tank 4, and the rest flows through a bearing return oil pipe 12, an air bleed tank 13, and a supply pipe 15 and back to the vacuum tank 4. The opening of a control valve 18 is kept at a specified value by means of a control panel 21, and after lubricating oil is caused to flow at a high velocity of flow for a specified time, a velocity of flow is decreased. Right thereafter, a solenoid valve 19 is opened and closed at a cycle of 3-7 seconds for a specified time, compressed air is intermittently injected, and the flow of lubricating oil is returned to its initial high velocity of flow. Through repetition of the aboves, pulsation is forced to occur in a piping, and a foreign matter in the recessed part of a piping can be caused to effectively flow to the outside.

Description

Detailed Description of the Invention (Objective of the Invention) (Industrial Field of Application) The present invention relates to a method for removing foreign matter from a liquid transfer pipe such as a lubricating oil pipe. (Prior Art) A conventional method according to FIG. Figure 4 shows the seal oil system of a turbine generator. Hydrogen gas is sealed in the generator to cool the inside of the stator ■, and this hydrogen gas is transferred to the rotor shaft ■. A seal ring ■ is attached to prevent leakage.

The stator (
(g) Pressure oil higher than the hydrogen gas pressure inside the hydraulic pressure regulating valve 0
This prevents hydrogen from leaking from the feed rotor shaft (■) through the oil supply pipe (■). Since the gap between this seal ring ■ and the rotor shaft ■ is minute, when removing foreign matter remaining in the piping after assembling the equipment and installing the oil supply pipe ■, put lubricating oil in the vacuum chamber (A) and operate the oil pump ■. Fully open the oil pressure adjustment valve 0 and let the lubricating oil flow through the oil supply pipe (■) and from the temporary strainer (8) to the bearing chamber (■). A portion of the lubricating oil that has entered the bearing chamber ■ passes through the inner return oil pipe (10), enters the expansion tank (l1), flows through the float trap chamber (l4), and flows into the air extraction tank (l3).
Or return to the vacuum chamber (d). Other lubricating oil passes through the bearing return oil pipe (12), enters the air extraction tank (13), and enters the supply pipe (15).
) and return to vacuum printing. In such a circuit, the oil pump 0 is continuously operated to flow the maximum possible amount of oil into the piping and remove foreign matter in the piping6 (Problem to be solved by the invention) However, these methods It was difficult to sufficiently remove foreign matter remaining in the area. Hammering was performed on the welded area, but it was not sufficient. Furthermore, there was a problem in that it was difficult to remove foreign matter remaining in the concave portions of joints used in connection parts of liquid transfer pipes such as lubricating oil pipes. SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus and a method for easily removing foreign matter in a liquid transfer pipe such as lubricating oil.

[Structure of the invention]

(Means for Solving the Problems) - In order to achieve the object described in F, the pipe flushing device of the present invention connects a compressed gas injection pipe equipped with a solenoid valve to the upstream side of the main pipe, and connects the main pipe to the main pipe. A control valve for adjusting the flow rate of the main pipe is provided upstream of the injection pipe connection part, and the solenoid valve and the control valve are connected to a control panel to perform intermittent injection of compressed gas when the flow velocity of the main pipe is slowed down. Constructed to remove foreign objects in the main piping.

(Operation) The in-pipe flushing device of the present invention configured as described above slows down the flow of lubricating oil or liquid and intermittently injects compressed air in a short period of time to cause turbulence in the flow in the pipe. At the same time. A space with almost no liquid is temporarily created, and a mixture of air and liquid flows through this space at high speed, making it possible to remove foreign objects in the pipes, especially foreign objects in the recesses of the pipe joints.

(Example) An example of the present invention will be explained with reference to FIGS. 1 to 3. On the outlet side of oil pump 0, a control valve (18) is installed in place of the check valve (l7) installed in Fig. 4, and compressed air is supplied through an air tank (20) and a solenoid valve (19). Connect to the drain valve (16) with a high pressure hose. Control valve (l
8) and the solenoid valve (19) are electrically connected to the control panel (2l).

Next, the operation of this embodiment will be described.

After configuring the circuit in this way, operate the oil pump ■ and let the lubricating oil flow through the circuit as explained in Figure 4. control panel(
In 21), a predetermined program is set to open and close the control valve (18) according to the predetermined schedule, thereby changing the flow rate of the lubricating oil in the pipe. Similarly to the control valve (18), the solenoid valve (19) opens and closes in conjunction with the control valve (18) according to a program determined by the control panel (21). now. The control panel (21) instructs the lubricating oil to flow at a predetermined high flow rate in the piping, and the control valve (1)
8) Keep the opening constant. After the lubricating oil has been allowed to flow for a specified period of time in this state, the opening degree of the control valve (18) is reduced to slow down the flow rate of the lubricating oil.

Immediately after this, the solenoid valve (19) is repeatedly opened and closed for a certain period of time in cycles of about 3 to 7 seconds according to instructions from the control panel (21).
After the solenoid valve (l9) has been opened and closed for a predetermined period of time, the control valve (l8) is opened according to instructions from the control panel (21) to return the flow of lubricating oil to its original flow velocity, and at the same time, the solenoid valve ( 19
) and continue to flow for a period of time at a high flow rate. This is considered to be one large cycle, and this cycle is repeated a predetermined number of times depending on the length of the piping.

Figure 2 shows the compressed air injection situation. Using the device shown in Figure 1 to slow down the flow of lubricating oil in the piping, compressed air is injected intermittently for short periods of about 3 to 7 seconds to create turbulence in the flow of lubricating oil. At the same time, a mixture of compressed air and lubricating oil flows at high speed at the bottom of the pipe in a state where the oil temporarily runs out, allowing foreign matter remaining in the recess of the pipe joint to be efficiently flushed out.

Of course, such an effect can also be achieved by manual operation using a manual valve instead of the control valve (18) and the solenoid valve (19).

In the above embodiment, the case of a turbine generator was explained, but for example, as shown in Fig. 3, lubricating oil piping of a power generation turbine, and other lubricating oil piping of a large rotating machine for which piping welding work is performed during installation work, and liquid. It goes without saying that this method can also be applied to removing residual foreign matter in long pipes being transported. [Effects of the Invention] As described above, the present invention reduces the flow rate of lubricating oil or liquid to zero in order to effectively drain foreign matter remaining in the recess of a pipe joint. After slowing down to about 5 m/sec, compressed air is injected into the piping in short cycles of about 3 to 7 cycles to create pulsation in the piping and instantaneously fill a space devoid of lubricating oil or liquid. By making a mixture of compressed air and liquid flow through this part at high speed, foreign matter remaining in the recess of the joint can be effectively flushed out.

After this intermittent injection of compressed air is carried out for a set period of time, the flow rate is increased and lubricating oil or liquid is flowed for a set period of time.This is one cycle, and the number of cycles is determined by the length of the piping and the number of joints, so that no residual oil remains effectively. Foreign matter can be flushed out.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of an in-pipe flushing device according to an embodiment of the present invention, Fig. 2 is a diagram showing an example of the compressed air injection mode of the in-pipe flushing device according to the present invention, and Fig. 3 is another embodiment. Figure 4 is a circuit diagram of a conventional pipe flushing device. 3...Seal ring 4...Vacuum tank 5...Oil pump 6...Hydraulic pressure adjustment valve #-Oil 7...Wain pipe 11...Expansion tank l3...Air extraction tank 15. ... Replenishment oil pipe 18 ... Control valve 20 ... Air tank 10 ... Inner return oil pipe l2 ... Bearing return oil pipe 14 ... Float trap chamber 16 ... Drain valve 19 ... Solenoid valve 2L ... Control panel agent Patent attorney Nori Ken Ken Yudo Deshimaru Stator 110 hours Figure 2 Figure II Figure

Claims (1)

[Claims] A compressed gas injection pipe equipped with a solenoid valve is connected to the upstream side of the main pipe, and a control valve for adjusting the flow rate of the main pipe is provided upstream of the injection pipe connection part of the main pipe, and the solenoid valve and the control valve A piping flushing device characterized in that when the main piping is connected to a control panel and the flow velocity of the main piping is slowed down, compressed gas is intermittently injected to remove foreign matter from the main piping.