JP3790334B2 - Pipe inner surface processing apparatus and pipe inner surface processing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tube inner surface treatment apparatus and a tube inner surface treatment method, grinding an inner surface of a pipe to be treated (piping, pipe, etc.), removing or cleaning a scale generated on the inner surface of the pipe to be treated, It is devised so that the decontamination work of the inner surface of the radioactive pipe can be performed efficiently by a small machine.
[0002]
[Prior art]
Pipe inner surface treatment technology (pipe inner surface grinding technology) that circulates mixed air made by mixing abrasive with compressed air into the pipe as a method of grinding or cleaning (polishing) the inner surface of the pipe (pipe). And pipe inner surface cleaning (polishing) technology).
[0003]
As a conventional aspect of the pipe inner surface treatment technique, for example, there are the following three aspects.
In a 1st aspect, a nozzle is inserted in the inside of piping, and the mixed air formed by mixing an abrasive with compressed air is injected from the said nozzle into the inside of piping.
In a 2nd aspect, the mixed air formed by mixing a grinding material with compressed air is injected in high pressure from the one end side of piping to the inside of piping, distribute | circulates the inside of piping, and is discharged | emitted from the other end part of piping.
In the third aspect, the swirling motion is given to the mixed air obtained by mixing the abrasive with the compressed air, and the swirling mixed air is injected from the one end side of the pipe into the pipe at a high pressure to swirl the inside of the pipe. While being circulated, it is discharged from the other end of the pipe.
[0004]
Here, an example of a conventional technique for performing tube inner surface treatment (grinding or cleaning) according to the third aspect will be described with reference to FIGS. 4 and 5. As shown in both figures, a mixed air supply pipe 02 for supplying mixed air (compressed air mixed with an abrasive) is connected to one end side (left end side) of the base 01, and the other end of the base 01. The left end of the pipe to be ground 03 is detachably inserted and connected to the side (right end side). A swivel plate 04 and an injection nozzle 05 are built in the base 01, and a compressed air pipe 06 is attached obliquely.
[0005]
The swivel plate 04 has a shape in which one end of a rectangular plate is twisted half a turn. Therefore, the mixed air supplied through the mixed air supply pipe 02 is given a swirl motion by flowing and passing through the installation portion of the swirl plate 04. The mixed air to which the swirl motion is given is ejected from the ejection nozzle 05 and enters the ground pipe 03, and flows while swirling in the ground pipe 03. As a result, since the abrasive of the mixed air collides with the inner surface of the pipe to be ground 03 and performs grinding, the inner surface of the pipe to be ground 03 can be ground and cleaned.
[0006]
Further, the compressed air pipe 06 is attached in an oblique state in which the angle formed by the axial direction of the compressed air pipe 06 and the axial direction of the injection nozzle 05 is an acute angle when examined in the axial section as shown in FIG. Yes. Moreover, when examined in a radial cross section as shown in FIG. 5, the compressed air ejected from the compressed air pipe 06 follows the tangential direction of the inner peripheral surface of the base 01 so that the compressed air swirls on the inner peripheral surface of the base 01. In the state, a compressed air pipe 06 is attached. For this reason, the mixed air which is the swirling flow ejected from the ejection nozzle 05 is increased in the swirling direction flow velocity as the axial flow rate is increased by the compressed air ejected from the compressed air pipe 06.
[0007]
[Problems to be solved by the invention]
By the way, in the conventional first aspect described above, since the nozzle is inserted into the pipe, there are drawbacks in that the shape of the pipe is greatly restricted in operation and the structure of the grinding apparatus is complicated.
[0008]
Further, in the second conventional mode described above, the flow velocity in the vicinity of the inner surface of the pipe is reduced as compared with the flow velocity in the central portion of the pipe cross section, and most of the abrasive passes through the central portion of the pipe cross section where the flow velocity is high. For this reason, there is a disadvantage that the grinding effect is low and the amount of the abrasive used is increased.
[0009]
In the above-described conventional third aspect, the swirl motion is given to the mixed air so that the inside of the pipe is circulated, so that the problem in the second aspect can be reduced. However, in the third mode, since the swirl flow is generated using the swirl plate 04, it is difficult to generate a large swirl flow velocity. Further, the ratio between the swirl direction flow velocity and the axial flow velocity of the mixed air flowing through the pipe has an optimum ratio depending on the object to be ground, but in the conventional third aspect, the mixed air flowing through the pipe is mixed. The ratio between the swirl direction flow velocity and the axial flow rate could not be adjusted. In the third aspect, the swirling direction of the mixed air is only increased (decreased) simultaneously by the swirling direction flow velocity and the axial flow rate of the mixed air ejected from the ejection nozzle 05 by the compressed air ejected from the compressed air pipe 06. The ratio between the directional flow rate and the axial flow rate could not be adjusted.
[0010]
In addition, in each of the above-described conventional technologies, extremely high-pressure compressed air is used in any of the technologies, and thus a device configuration that can withstand such an extremely high pressure has to be provided, which tends to increase the device configuration and increase costs. I was invited. In addition, since a very high-pressure compressed air is required, a large drive source (such as a motor) is required to drive the compressed air generator.
[0011]
In view of the above prior art, the present invention can control the ratio of the swirling direction flow velocity and the axial flow velocity of the mixed fluid (mixed air), and can perform sufficient processing (grinding / cleaning) with the low-pressure fluid (air). -It aims at providing the pipe inner surface processing apparatus and the pipe inner surface processing method which can acquire the decontamination effect.
[0012]
[Means for Solving the Problems]
The configuration of the present invention that solves the above problems includes a mixed fluid supply pipe that is supplied with a processing medium and a compressed fluid, and discharges a mixed fluid formed by mixing the compressed fluid with the processing medium from the tip.
The fluid is supplied from the compressed fluid source to the base end side of the mixed fluid supply pipe, and the discharge amount of the mixed fluid discharged from the tip of the mixed fluid supply pipe is adjusted by adjusting the supply amount of the supplied fluid. A mixed fluid amount adjusting mechanism;
A swirl flow forming portion that forms an annular space in which a distal end portion of the mixed fluid supply pipe is inserted and an axial center of the distal end portion is a rotation axis; and a coaxial position with the distal end portion of the mixed fluid supply pipe; A vortex-type element having an outlet nozzle that is arranged in a state facing the tip of the mixed fluid supply pipe and to which a pipe to be processed is connected on the outlet side;
By blowing the fluid of the compressed fluid source into the annular space along the tangential direction of the circumferential surface of the swirl flow forming portion, the fluid flows in the annular space with the axial center of the tip portion as the rotational axis. A swirling flow fluid amount adjusting mechanism for forming a swirling flow formed by swirling and adjusting a supply amount of a fluid to be blown, and
A control flow fluid amount adjusting mechanism for forming a control flow by blowing the fluid of the compressed fluid source into the annular space of the swirl flow forming section and adjusting the supply amount of the blown fluid;
It is characterized by comprising.
[0013]
Further, the configuration of the present invention is such that a mixed fluid obtained by mixing a processing medium with a compressed fluid is discharged from the tip of a mixed fluid supply pipe, and the discharged mixed fluid is circulated through an outlet nozzle before the inside of the processing pipe. In the pipe inner surface treatment method of treating the inner surface of the pipe with the treatment medium by ejecting it and circulating the inner face of the pipe to be treated,
A swirl flow that swirls around the axis of the tip of the mixed fluid supply pipe as a rotation axis is formed by the fluid, and a control flow that merges with the swirl flow and flows into the processing pipe is formed by the fluid,
In addition, the ratio of the supply amount of the fluid forming the swirl flow and the supply amount of the fluid forming the control flow is adjusted.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings.
[0015]
FIG. 1 is a block diagram showing a tube inner surface processing apparatus according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view (II-II cross-sectional view of FIG. 1) centering on the eddy current type element. As shown in both drawings, the vortex-type element 1 is a hollow member, and the front end portion (right end portion in FIG. 1) 2 a of the mixed air supply pipe 2 is inserted into the vortex-type element 1. The swirl flow forming portion 1 a of the vortex flow element 1 forms an annular space 1 b with the axis of the tip 2 a of the mixed air supply pipe 2 as the rotation axis. Further, the outlet nozzle 1c provided in the vortex element 1 is arranged in a state where the axis of the outlet nozzle 1c coincides with the axis of the tip 2a of the mixed air supply pipe 2 and faces the tip 2a. In addition, the pipe to be ground (processed pipe) 3 whose inner peripheral surface is processed (grinding, cleaning, and decontamination) has one end side (left end side in FIG. 1) at the outlet of the outlet nozzle 1c. Removably connected to the side.
[0016]
High-pressure air (fluid) compressed by the compressor 4, which is a compressed air source (compressed fluid source), is supplied to the three supply pipes 6, 7, and 8 through the header 5.
[0017]
Since the supply pipe 6 is connected to the base end side (the left end side in FIG. 1) of the mixed air supply pipe 2, the high-pressure air sent to the supply pipe 6 is sent to the mixed air supply pipe 2. In the middle of the mixed air supply pipe 2, an abrasive supply device 9 is interposed, and the abrasive (processing medium) stored in the abrasive hopper 10 is mixed by the abrasive supply device 9 with the mixed air supply pipe 2. Supplied in. For this reason, high-pressure air (that is, mixed air) in which the abrasive is mixed flows in the mixed air supply pipe 2 on the downstream side of the abrasive supply device 9, and the mixed air (mixed fluid) is the tip 2a. It is discharged from the end.
[0018]
The supply pipe 6 is provided with a flow rate adjusting valve 6a. By adjusting the opening degree of the valve 6a, the amount of supply air, and consequently, the mixture discharged from the front end 2a of the mixed air supply pipe 2 is mixed. The amount of air can be adjusted. That is, the opening degree of the valve 6a is adjusted so as to obtain an optimum abrasive supply pressure in consideration of the amount of air (air pressure) supplied from supply pipes 7 and 8, which will be described later. As described above, the supply pipe 6 and the valve 6a form a mixed air amount adjusting mechanism (mixed fluid amount adjusting mechanism) for adjusting the mixed air amount and the abrasive supply pressure.
[0019]
The supply pipe 7 is provided with a flow rate adjusting valve 7 a, and the tip of the supply pipe 7 is connected to the swirl flow generation supply port 1 d of the vortex flow element 1. In addition, the swirl flow generating supply port 1d is arranged in a state extending in the tangential direction of the inner peripheral surface of the swirl flow forming portion 1a in the radial cross section as shown in FIG. In addition, the axial direction of the swirl flow generating supply port 1d and the axial direction of the outlet nozzle 1c and the distal end portion 2a are arranged orthogonally. Incidentally, in the prior art shown in FIG. 4, the axial direction of the compressed air pipe 06 and the axial direction of the injection nozzle 05 intersect at an angle (acute angle).
[0020]
For this reason, the high-pressure air supplied from the compressor 4 to the supply pipe 7 via the header 5 passes through the tangential direction of the inner peripheral surface of the swirl flow forming portion 1a from the swirl flow generation supply port 1d, and the annular space 1b. Since the air is blown in, a strong swirling flow RF is generated in the annular space 1b by the air blown in the tangential direction. This swirl flow RF swirls and circulates in the annular space 1b of the swirl flow forming portion 1a with the shaft center of the tip 2a of the mixed air supply pipe 2 as the rotation shaft. A swirling force is applied to the mixed air discharged from the tip end portion 2a of the mixed air supply pipe 2 and incident on the outlet nozzle 1c by the swirling flow RF.
[0021]
At this time, the amount of air blown from the supply pipe 7 into the swirl flow forming portion 1a can be adjusted by adjusting the opening degree of the valve 7a. In this way, by adjusting the amount of air blown from the supply pipe 7 into the swirl flow forming unit 1a, the swirl direction flow velocity of the swirl flow RF can be adjusted. In this manner, the supply pipe 7 and the valve 7a form a swirling flow air amount adjusting mechanism (swirl flow fluid amount adjusting mechanism) for adjusting the supply amount of air forming the swirling flow RF.
[0022]
A flow rate adjusting valve 8 a is interposed in the supply pipe 8, and the tip of the supply pipe 8 is connected to the control flow generating supply port 1 e of the vortex type element 1. Moreover, the control flow generating supply port 1e is arranged in a direction along the radial direction of the swirl flow forming portion 1a in the radial cross section as shown in FIG.
[0023]
For this reason, the high-pressure air supplied from the compressor 4 to the supply pipe 8 via the header 5 passes from the control flow generation supply port 1e along the radial direction from the outer peripheral side to the center side of the swirl flow forming portion 1a, The air is blown into the annular space 1b. For this reason, by the air blown off in the radial direction, a control flow CF is generated in the annular space 1b from the outer peripheral side to the circular center side along the radial direction. When the control flow CF is strengthened, that is, when the supply amount of air from the supply pipe 8 to the vortex-type element 1 is increased, the amount of air flowing into the ground pipe 3 is also increased. The flow rate can be increased. Conversely, if the control flow CF is weakened, that is, if the amount of air supplied from the supply pipe 8 to the vortex-type element 1 is reduced, the amount of air flowing into the pipe 3 to be ground is also reduced. The directional flow rate can be reduced.
[0024]
At this time, the amount of air blown from the supply pipe 8 into the swirl flow forming portion 1a can be adjusted by adjusting the opening of the valve 8a. Thus, the strength of the control flow CF can be adjusted by adjusting the amount of air blown from the supply pipe 8 into the swirl flow forming unit 1a. As described above, the supply pipe 8 and the valve 8a form a control flow air amount adjustment mechanism (control flow fluid amount adjustment mechanism) for adjusting the supply amount of air forming the control flow CF.
[0025]
A swirling motion is imparted to the mixed air discharged from the distal end portion 2 a of the mixed air supply pipe 2 by the swirling flow RF generated in the swirl type element 1. At this time, the greater the flow velocity of the swirl flow RF, the stronger the swirl motion imparted to the mixed air. Further, when the flow velocity of the swirl flow RF is the same, the larger the control flow CF, the larger the axial flow velocity applied to the mixed air. The mixed air to which the swirl motion is imparted flows in the axial direction while swirling, enters the outlet nozzle 1c, is compressed by passing through the outlet nozzle 1c, and is injected into the grinding pipe 3. The injected mixed air circulates in the axial direction while performing a swiveling motion, and grinds the inner surface of the pipe 3 to be ground.
[0026]
The axial flow velocity of the mixed air can be controlled by adjusting the opening of the valve 8a. That is, the axial flow rate can be increased by increasing the opening of the valve 8a, and the axial flow rate can be decreased by decreasing the opening of the valve 8a. The swirl direction flow velocity of the mixed air can be controlled by adjusting the opening of the valve 7a. That is, the turning direction flow velocity can be increased by increasing the opening degree of the valve 7a, and the turning direction flow velocity can be reduced by reducing the opening degree of the valve 7a.
[0027]
Therefore, by adjusting the opening degree of the valves 6a, 7a, 8a, the ratio of the swirl direction flow velocity and the axial flow velocity of the mixed air flowing through the inside of the pipe 3 to be ground is determined according to the processing (grinding) situation and the pipe to be ground. It can be set optimally according to the characteristics of 3. Therefore, efficient processing (grinding etc.) can be performed.
[0028]
Further, since air is blown out to the annular space 1a along the tangential direction of the inner peripheral surface of the swirl portion forming portion 1a of the swirl type element 1, a strong swirl flow RF is generated even if the air pressure is not so large. To do. That is, it is possible to easily generate a swirl flow having a swirl direction flow velocity larger than the axial flow velocity. Therefore, even if the pressure of the supplied air is lower than the conventional pressure, a sufficient swirling motion can be imparted to the mixed air. In this respect, the air source has a simpler configuration than the conventional one, and the cost can be reduced. Moreover, since the swirl | vortex direction flow velocity of mixed air can be enlarged, it can grind effectively and the usage-amount of an abrasive can be reduced.
[0029]
FIG. 3 shows another example of the eddy current element 1. In the vortex element 1 of this example, a ring portion 1f arranged concentrically with the mixed air supply pipe 2 is coaxially attached to the side surface of the swirl flow forming portion 1a in a communicating state. Therefore, the annular space 1b formed by the swirl flow forming portion 1a and the inner space of the ring portion 1f become an integrated annular space. The control flow generating supply port 1e is attached to the swirl flow forming portion 1a via the ring portion 1f.
The configuration and operation of other parts are the same as those in FIGS. 1 and 2.
[0030]
Here, the behavior when grinding in various states will be described with reference to the embodiment shown in FIGS.
[0031]
When the pipe 3 to be ground is a SUS pipe and the pressure of the air generated by the compressor 4 is 0.5 kg / cm ² , the mixed air flows in the axial direction while turning inside the pipe 3 to be ground which is a SUS pipe. The inside of the pipe 3 to be ground could be satisfactorily ground by (the air in which the abrasive was mixed). Incidentally, conventionally, compressed air having a pressure of about 3 to 7 kg / cm ² has been used.
[0032]
In addition, when the grinding tube 3 is made of a transparent acrylic tube and the grinding operation is performed, the grinding material advances and grinds the inner surface of the acrylic tube while drawing a spiral trajectory. It was observable from. Moreover, it was confirmed that the pitch of the spiral trajectory can be arbitrarily changed by changing the strength of the control flow CF. That is, it was confirmed that by changing the strength of the control flow CF, the ratio between the swirling direction flow velocity and the axial flow velocity of the mixed air flowing through the pipe, that is, the pitch of the spiral trajectory can be arbitrarily changed.
[0033]
When the pipe 3 to be ground is long, if the helical pitch of the abrasive is short, the grinding effect is attenuated and weakened at the end of the pipe. However, if the helical pitch of the abrasive is increased, that is, the axial flow velocity of the mixed air It was confirmed that good grinding was possible even at the end of the pipe when the control was made to speed up.
[0034]
【The invention's effect】
As specifically described with the embodiments above, the present invention
A mixed fluid supply pipe which is supplied with a processing medium and a compressed fluid, and discharges a mixed fluid formed by mixing the processing medium with the compressed fluid from the tip;
The fluid is supplied from the compressed fluid source to the base end side of the mixed fluid supply pipe, and the discharge amount of the mixed fluid discharged from the tip of the mixed fluid supply pipe is adjusted by adjusting the supply amount of the supplied fluid. A mixed fluid amount adjusting mechanism;
A swirl flow forming portion that forms an annular space in which a distal end portion of the mixed fluid supply pipe is inserted and an axial center of the distal end portion is a rotation axis; and a coaxial position with the distal end portion of the mixed fluid supply pipe; A vortex-type element having an outlet nozzle that is arranged in a state facing the tip of the mixed fluid supply pipe and to which a pipe to be processed is connected on the outlet side;
By blowing the fluid of the compressed fluid source into the annular space along the tangential direction of the circumferential surface of the swirl flow forming portion, the fluid flows in the annular space with the axial center of the tip portion as the rotational axis. A swirling flow fluid amount adjusting mechanism for forming a swirling flow formed by swirling and adjusting a supply amount of a fluid to be blown, and
A control flow is formed by blowing the fluid of the compressed fluid source into the annular space of the swirl flow forming portion, and a control flow fluid amount adjusting mechanism for adjusting the supply amount of the blown fluid is provided.
[0035]
In the present invention, a mixed fluid obtained by mixing a processing medium with a compressed fluid is discharged from the tip of a mixed fluid supply pipe, and the discharged mixed fluid is circulated through an outlet nozzle and then ejected into the processing target pipe. Then, in the pipe inner surface processing method of processing the pipe inner surface with the processing medium by circulating the inner surface of the pipe to be processed,
A swirl flow that swirls around the axis of the tip of the mixed fluid supply pipe as a rotation axis is formed by the fluid, and a control flow that merges with the swirl flow and flows into the processing pipe is formed by the fluid,
In addition, the ratio of the supply amount of the fluid that forms the swirl flow and the supply amount of the fluid that forms the control flow is adjusted.
[0036]
Thus, in the present invention, in the vortex type element, the fluid is blown into the annular space along the tangential direction of the circumferential surface of the swirl flow forming portion, so that a strong swirl flow can be generated. A strong swirl flow can impart a large swirl motion to the mixed fluid (air). That is, it is possible to generate a mixed fluid (air) having a swirl direction flow velocity larger than the axial flow velocity. As a result, a mixed fluid (air) having a swirl direction flow velocity larger than the axial flow velocity can be circulated inside the tube to be processed, and the inner surface of the tube to be processed can be effectively treated (grinding / cleaning / decontamination). ) And the usage fee of the processing medium (abrasive) can be reduced.
[0037]
Since the swirl flow generating fluid (air) is supplied in a tangential direction to the swirl flow forming portion of the vortex flow element, a strong swirl flow is generated even if the pressure of the swirl flow generating fluid (air) is low. For this reason, as a fluid (air) source, what generate | occur | produces the fluid (air) of a pressure lower than before can be used, and the drive source (motor) of a fluid (air) source can be made small.
[0038]
Further, the fluid of the compressed fluid source is blown into the annular space along the tangential direction of the circumferential surface of the swirl flow forming portion of the vortex-type element to form a swirl flow, and the fluid of the compressed fluid source is Separately, the control flow is formed by blowing into the annular space of the vortex type element, and the amount of fluid (air) to be blown is adjusted, so the strength of the swirl flow and the strength of the control flow are Can be adjusted. For this reason, the ratio of the swirling direction flow velocity and the axial direction flow velocity of the mixed fluid (air) can be changed, and favorable processing (grinding or the like) can be performed according to the processing (grinding or the like) target.
[0039]
That is, when the pipe to be processed (grinding pipe) is short, high speed processing (grinding) is performed by increasing the flow velocity in the turning direction and reducing the pitch of the spiral trajectory drawn by the processing medium. When the pipe is long, processing (grinding) can be performed uniformly to the end of the pipe by slowing the flow velocity in the turning direction and increasing the pitch of the spiral trajectory drawn by the processing medium. In addition, even when there is a part where the swirl flow is expected to be attenuated, such as an elbow, in the pipe to be ground, and under various other conditions, the optimum processing can be achieved by changing the pitch of the spiral trajectory drawn by the processing medium. (Grinding) conditions can be obtained.
[0040]
When air or the like is used as the fluid, the work to dry the inside of the tube to be processed before grinding to prevent the processing medium and dust from remaining can be easily performed with the same equipment by stopping the supply of the processing medium. Can do.
[0041]
Further, the mixed fluid is supplied into the processing pipe through the outlet nozzle, and the fluid supplied from the swirling flow fluid amount adjusting mechanism or the control flow fluid amount adjusting mechanism to the swirling flow forming unit is also processed through the outlet nozzle. Since it is supplied into the pipe, the processing medium does not enter the annular space in the swirl flow forming section, and the vortex element is not worn. Also, there is little noise.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a pipe inner surface treatment apparatus according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a part of a vortex type element in the pipe inner surface treatment apparatus according to the embodiment.
FIG. 3 is a cross-sectional view showing another example of a vortex type element.
FIG. 4 is a configuration diagram showing an example of a conventional technique.
5 is a cross-sectional view showing a VV cross section of FIG. 4. FIG.
[Explanation of symbols]
01 Base 02 Mixed Air Supply Pipe 03 Ground Pipe 04 Swivel Plate 05 Injection Nozzle 06 Compressed Air Supply Pipe 1 Swirl Element 1a Swirl Flow Forming Unit 1b Annular Space 1c Outlet Nozzle 1d Swirl Flow Generation Supply Port 1e For Control Flow Generation Supply port 1f Ring part 2 Mixed air supply pipe 3 Pipe to be ground 4 Compressor 5 Headers 6, 7, 8 Supply pipes 6 a, 7 a, 8 a Valve 9 Grinding material supply device 10 Grinding material hopper RF Swirling flow CF Control flow

Claims (2)

A mixed fluid supply pipe that is supplied with a processing medium and a compressed fluid, and discharges a mixed fluid formed by mixing the compressed fluid with the processing medium from the tip; and a proximal side of the mixed fluid supply pipe from a compressed fluid source A mixed fluid amount adjusting mechanism that adjusts the discharge amount of the mixed fluid discharged from the tip of the mixed fluid supply pipe by adjusting the supply amount of the supplied fluid,
A swirl flow forming portion that forms an annular space in which a distal end portion of the mixed fluid supply pipe is inserted and an axial center of the distal end portion is a rotation axis; and a coaxial position with the distal end portion of the mixed fluid supply pipe; A vortex-type element having an outlet nozzle that is arranged in a state facing the tip of the mixed fluid supply pipe and to which a pipe to be processed is connected on the outlet side;
By blowing the fluid of the compressed fluid source into the annular space along the tangential direction of the circumferential surface of the swirl flow forming portion, the fluid flows in the annular space with the axial center of the tip portion as the rotational axis. A swirling flow fluid amount adjusting mechanism for forming a swirling flow formed by swirling and adjusting a supply amount of a fluid to be blown, and
A control flow fluid amount adjusting mechanism for forming a control flow by blowing the fluid of the compressed fluid source into the annular space of the swirl flow forming section and adjusting the supply amount of the blown fluid;
A pipe inner surface treatment apparatus characterized by comprising: The mixed fluid formed by mixing the processing medium with the compressed fluid is discharged from the tip of the mixed fluid supply pipe, and the discharged mixed fluid is circulated through the outlet nozzle and then ejected to the inside of the pipe to be processed. In a pipe inner surface treatment method of treating a pipe inner surface with a treatment medium by circulating the pipe inner surface,
A swirl flow that swirls around the axis of the tip of the mixed fluid supply pipe as a rotation axis is formed by the fluid, and a control flow that merges with the swirl flow and flows into the processing pipe is formed by the fluid,
In addition, the pipe inner surface processing method is characterized in that the ratio between the supply amount of the fluid forming the swirl flow and the supply amount of the fluid forming the control flow is adjusted.

Images