JP2003019670A - Pipe inner surface processing apparatus and pipe inner surface processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe inner surface processing device and method, capable of controlling the supply quantity of abrasive not to have a bad influence on the grinding accuracy and grinding speed even under bad conditions where a pipe to be ground is long and the supply quantity of abrasive is large. SOLUTION: In this pipe inner surface processing apparatus 1, processing fluid obtained by mixing a processing fluid with a transport fluid is supplied to the inner surface of the pipe 2 to be processed, thereby processing the inner surface of the pipe 2 to be processed. The processing apparatus is provided with a processing fluid supply pipe 3 for supplying the processing fluid to the pipe 2 to be processed, a processing medium supply means 4 for supplying the processing medium stored in a storing tank 9 to the processing fluid supply pipe 3, and a compressed fluid supply means 17 for supplying compressed fluid to the processing medium in the storing tank 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to the grinding work of the inner surface of a pipe to be treated (pipes, pipes, etc.), the removal and cleaning work of the scale generated on the inner surface of the pipe to be treated, and the decontamination work of the inner surface of radioactive pipes. The present invention relates to a pipe inner surface processing apparatus and method.

[0002]

2. Description of the Related Art When treating the inner surface of a pipe such as grinding the inner surface of the pipe to be treated or removing the scale generated on the inner surface of the pipe to be treated, an abrasive such as alumina is mixed with compressed air. A method of pumping the mixed air into the pipe to scrape the inner surface of the pipe and the scale is widely used. For example, Japanese Patent Laid-Open No. 11-58241 discloses a pipe inner surface processing apparatus and method for grinding the inner surface of a pipe by supplying a mixed air as a swirling flow into the pipe.

An example of the pipe inner surface processing apparatus based on the above method will be described with reference to FIGS. 7 to 9. In FIG. 7, a pipe inner surface processing apparatus 101 includes a mixed air supply pipe 103 for supplying mixed air, in which an abrasive and compressed air are mixed, to a pipe to be ground 102, and an abrasive to the mixed air supply pipe 103. An abrasive material supply device 104 for supplying the compressed air, a swirl element 105 for forming a swirling flow that swirls around the axis of the pipe to be ground 102, a compressor 108 for generating compressed air, and a head for storing the compressed air. 10
6 is the main component.

The mixed air supply pipe 103 has one end (rear end) 103a connected to the header 106 and the other end (tip) 103b reaching the inside of the vortex type element 105. Further, a valve 113 and an abrasive material supply device 104 are provided in the middle of the mixed air supply pipe 103.

The abrasive material supply device 104 is provided at a connection position of the mixed air supply pipe 103 and the hopper 109 in which the abrasive material is stored so that the mixed air supply pipe 103 and the hopper 109 communicate with each other. As shown in FIG. 9, an orifice 107 and an abrasive material supply amount adjusting valve 110 are provided.

The vortex flow element 105 includes a swirl flow forming portion 105a forming a hollow space having a short columnar shape having an axis line in the horizontal direction in FIG. 7, and an outlet nozzle 1 communicating with the downstream side thereof.
05b and the tip 10 of the outlet nozzle 105b.
An upstream end of the pipe 102 to be ground is fixed to the shaft 5e. The axis line 116 in FIG.
02 axis, and at least the outlet nozzle tip 105
The circle center of e, the circle center of the swirl flow forming portion 105a, and the circle center of the mixed air supply pipe tip 103b are formed on the same axis as the axis 116 of the pipe to be ground 102.

Further, the eddy current type element 105 has a header 10
The compressed air from 6 is supplied into the swirl flow forming unit 105a.
Two pipes 111 and 112 are connected. These two
The pipes 111 and 112 of the book are compressed air supply pipes (air supply pipes for swirl flow) 111 and compressed air supply pipes (air supply pipes for axial flow) 112, as shown in FIG. Is. Tip 1 of swirling air supply pipe 111
Reference numeral 11b denotes a compressed air supply port (air supply port for swirling flow generation) 10 opened in the tangential direction of the inner circumference of the swirling flow forming portion 105a.
5c is connected. In addition, the axial flow air supply pipe 1
The tip 112b of 12 is connected to a compressed air supply port (axial flow generation air supply port) 105d opened toward the center of the swirl flow forming portion 105a. The rear end 111a of the swirling air supply pipe 111 and the rear end 112a of the axial air supply pipe 112 are both connected to the header 106, and valves 114 and 115 are installed in the middle of both pipes. (See Figure 7).

A pipe inner surface treating apparatus 1 having the above-mentioned components.
According to No. 01, the inner surface of the pipe 102 to be ground is ground as follows.

The high-pressure air compressed by the compressor 108 passes through the header 106 and the mixed air supply pipe 10
3, the swirling air supply pipe 111 and the axial flow air supply pipe 112 are supplied respectively.

When the compressed air, which is supplied into the mixed air supply pipe 103 and the flow rate of which is adjusted by the opening degree of the valve 113, reaches the abrasive material supply device 104, the orifice 107 reduces the cross-sectional area through which the compressed air can flow. Therefore, the flow velocity of the compressed air is increased. On the other hand, the abrasive whose supply amount has been adjusted by the opening of the abrasive supply amount adjusting valve 110 falls from the abrasive hopper 109 to the vicinity of the outlet of the orifice 107. Then, the abrasive material rides on the flow of the compressed air ejected from the opening of the orifice 107, and the mixed air supply pipe 103 on the downstream side of the abrasive material supply device 104.
Mixed air M in which compressed air and abrasives are mixed inside
F is distributed. Then, the mixed air MF is discharged from the tip 103b of the mixed air supply pipe 103 to the outlet nozzle 105b formed in the vortex type element 105.

On the other hand, the compressed air supplied into the swirl flow air supply pipe 111 and having its flow rate adjusted by the opening degree of the valve 114 is supplied from the tip 111b of the swirl flow air supply pipe 111 to the swirl flow generation air supply port 105c. Supplied with. Then, the compressed air flows along the inner circumference of the swirl flow forming unit 105a, and the swirl flow RF swirling inside the swirl flow forming unit 105a is formed. Then, the swirling flow RF flows from the swirling flow forming portion 105a to the outlet nozzle 105b.

The compressed air, which is supplied into the axial flow air supply pipe 112 and whose flow rate is adjusted by the opening degree of the valve 114, has a tip 112 of the axial flow air supply pipe 112.
The air is supplied from b to the axial flow generating air supply port 105d. Then, from the compressed air, the swirling flow forming unit 10
It flows toward the center of 5a toward the inner side in the radial direction of the swirl flow forming portion 105a, and then flows to the outlet nozzle 105b. Here, the outlet nozzle 105b is the tube to be ground 1
02 is extended in the axial direction, compressed air from the axial flow air supply pipe 112 is discharged from the outlet nozzle 105b.
An axial flow CF that flows in the axial direction of the pipe 102 to be ground is formed in the process of flowing inside.

That is, in the pipe inner surface processing apparatus 101 described above, the mixed air MF, the swirling flow RF, and the axial flow CF are formed, respectively, and the flow rates thereof can be adjusted respectively. This makes it possible to generate a flow of mixed air according to various conditions such as the pipe length and the grinding speed, and to supply the mixed air into the pipe 102 to be ground. For example, when the flow velocity of the swirling flow RF is increased, the pitch of the spiral orbit drawn by the mixed air MF is shortened, so that the grinding work on the inner surface of the pipe to be ground can be completed in a short time, and the flow velocity of the swirling flow RF is reduced. If it is slowed down, the pitch of the spiral trajectory drawn by the mixed air becomes longer, so that the mixed air can be spread even to the tip of the long pipe to be ground and the inner surface of the pipe can be uniformly ground.

[0014]

As described above, the conventional pipe inner surface processing apparatus 101 adjusts the ratio of the swirling direction flow and the axial direction flow imparted to the mixed air MF flowing in the pipe 102 to be ground. By doing so, it is possible to effectively perform the grinding work on the inner surface of the pipe to be treated, but on the other hand, improvement of the problems described below is desired.

When the mixed air MF flows from the mixed air supply pipe 103 through the inside of the ground pipe 102, flow resistance is generated. The longer the length of the ground pipe is, the more ground the pipe to be ground and the mixed air communicating with it. The pressure of the supply pipe and the like will increase successively. On the other hand, since the abrasive supplied from the hopper 109 to the mixed air supply pipe 103 via the abrasive supply device 104 freely falls from the hopper 109 and is supplied to the abrasive supply pipe 103, the above description is given. If the pressure in the mixed air supply pipe 103 rises for some reason, it cannot fall smoothly. Then, it becomes difficult to control the supply amount of the abrasive, which adversely affects the grinding accuracy of the pipe 102 to be ground.

Further, in the pipe inner surface processing device 101, since the abrasive material is pressure-fed to the pipe 102 to be ground by injecting the orifice jet flow into the abrasive material which falls freely.
When a large amount of abrasives is needed, the jetting force of the orifice jet flow is weakened by the large amount of abrasives falling, and the abrasives cannot be smoothly supplied to the pipe 102 to be ground. Also in this case, it becomes difficult to control the supply amount of the abrasive material, which adversely affects the grinding accuracy of the pipe 102 to be processed.

Further, in the pipe inner surface processing apparatus 101, since the swirling flow forming section 105a is provided with the swirling flow generating air supply port 105c and the axial flow generating air supply port 105d, the swirling flow forming section 105a. The swirling flow RF and the axial flow CF flowing through the inside of each other interfere with each other in a manner orthogonal to each other. As a result, the swirling force of the swirling flow RF is weakened, which adversely affects the grinding depth in the radial direction of the inner surface of the pipe to be ground 102.

In view of the above problems, the present invention controls the amount of abrasive supplied even under adverse conditions such as the length of the pipe to be ground or the amount of abrasive supplied. It is an object of the present invention to provide a pipe inner surface processing apparatus and a method therefor which do not adversely affect grinding accuracy and grinding speed.

[0019]

SUMMARY OF THE INVENTION A pipe inner surface processing apparatus of the present invention treats the inner surface of a pipe to be processed by supplying the inner surface of the pipe to be treated with a processing fluid in which a processing medium and a transport fluid are mixed. In the pipe inner surface processing apparatus for performing, a processing fluid supply pipe for supplying the processing fluid to the processed pipe, and a processing medium supply means for supplying the processing medium stored in a storage tank to the processing fluid supply pipe, Compressed fluid supply means for supplying compressed fluid to the processing medium in the storage tank is provided.

According to the above-mentioned pipe inner surface processing apparatus, the processing medium stored in the storage tank is pushed out to the processing medium supply means by the compressed fluid from the compressed fluid supply means. As a result, even if the pressure in the pipe to be treated or the treatment fluid supply pipe rises, the treatment medium is smoothly supplied from the storage tank to the treatment fluid supply pipe through the treatment medium supply means, and the supply amount is always appropriate. The controlled processing medium is supplied to the pipe to be processed. As the compressed fluid supply means,
A bypass pipe branching from the middle of the processing fluid supply pipe and connected to the storage tank is suitable.

Further, the pipe inner surface processing apparatus of the present invention supplies the processing fluid, which is a mixture of the processing medium and the transport fluid, to the inner surface of the pipe to be processed, thereby performing the inner surface treatment of the pipe to be processed. The apparatus comprises a processing fluid supply pipe for supplying the processing fluid to the processed pipe, and a processing medium supply means for supplying the processing medium stored in a storage tank to the processing fluid supply pipe. The medium supply means has a processing medium suction means for sucking the processing medium and guiding it to the pipe to be processed.

According to the aforementioned pipe inner surface processing apparatus, the processing medium stored in the storage tank is supplied from the processing medium supply means to the processing fluid supply pipe and is sucked toward the processing pipe by the processing medium suction means. Becomes Here, by utilizing the suction force (ejector effect or the like) of the processing medium suction means, the processing medium is stably supplied to the pipe to be processed from a small amount to a large amount. A diffuser is suitable as the processing medium suction means.

Further, the pipe inner surface processing apparatus of the present invention supplies the processing fluid, which is a mixture of the processing medium and the transport fluid, to the inner surface of the pipe to be processed, thereby performing the inner surface treatment of the pipe to be processed. In the apparatus, a swirl flow forming part in which a swirl flow swirling around the axis of the pipe to be processed is formed, and an outlet nozzle communicating with the swirl flow forming part and having the end of the pipe to be processed coaxially arranged. And an axial flow supply pipe that supplies an axial flow that flows in the axial direction of the pipe to be processed to the pipe to be processed, and the tip of the axial flow supply pipe has the swirl type. It is characterized in that it penetrates the swirl flow forming portion of the element and reaches the outlet nozzle.

According to the pipe inner surface processing apparatus described above, since the tip of the axial flow supply pipe penetrates the swirl flow forming portion of the vortex flow type element and reaches the outlet nozzle, the shaft which flows in the axial direction of the pipe to be processed. The directional flow will be discharged into the outlet nozzle. On the other hand, the swirling flow swirling around the axis of the pipe to be treated is sufficiently formed in the swirling flow forming portion of the vortex type element and then flows into the outlet nozzle. As a result, the axial flow and the swirl flow join together for the first time in the outlet nozzle without being mixed, and a spiral flow formed by combining the swirl flow and the axial flow is formed in the pipe to be treated. It will flow in the axial direction. Here, in the main pipe inner surface processing device, since a flow (a flow in the radial direction of the swirl flow, etc.) that attenuates the swirl force of the swirl flow is not given to the swirl flow,
The swirling flow swirling around the axis of the pipe to be processed flows through in the axial direction of the pipe to be processed while maintaining its momentum.

Further, the pipe inner surface processing apparatus of the present invention supplies the processing fluid, which is a mixture of the processing medium and the transport fluid, to the inner surface of the pipe to be processed, thereby performing the inner surface treatment of the pipe to be processed. In the apparatus, a treatment fluid supply pipe that supplies the treatment fluid to the treatment pipe, and an axial flow supply pipe that supplies an axial flow flowing in the axial direction of the treatment pipe to the treatment pipe, The processing fluid supply pipe and the axial flow supply pipe are arranged concentrically.

According to the pipe inner surface processing apparatus, the axial flow supply pipe and the processing fluid supply pipe for supplying the axial flow flowing in the axial direction of the pipe to be processed to the pipe to be processed are concentrically arranged. Therefore, the treatment fluid and the axial flow smoothly flow in the axial direction of the pipe to be treated without being hit against the inner surface of the pipe to be treated. It is preferable to use a double pipe in which the ratio of the inner diameters of the processing fluid supply pipe and the axial flow supply pipe is approximately 1: 2, because the flow velocities of the processing fluid and the axial flow are substantially the same. .

Further, the pipe inner surface processing apparatus of the present invention supplies the processing fluid, in which the processing medium and the transport fluid are mixed, to the inner surface of the pipe to be processed, thereby performing the inner surface treatment of the pipe to be processed. The apparatus includes an axial flow supply pipe for supplying an axial flow flowing in the axial direction of the pipe to be processed to the pipe to be processed, and the axial flow supply pipe is circulated in the axial flow supply pipe. It is characterized in that rectifying means for rectifying the flow of the transport fluid into a flow in a direction coaxial with the pipe to be treated is provided.

According to the pipe inner surface processing apparatus described above, the axial flow supply pipe is provided with the rectifying means for rectifying the flow of the transport fluid flowing through the pipe into the flow in the coaxial direction with the pipe to be treated. Even if the flow direction of the transport fluid flowing into the axial flow supply pipe is different from the axial direction of the pipe to be treated, the flow is rectified by the rectifying means so that the flow is coaxial with the pipe to be treated. Will flow into.

Further, the pipe inner surface processing apparatus of the present invention supplies the processing fluid, in which the processing medium and the transport fluid are mixed, to the inner surface of the pipe to be processed, thereby performing the inner surface treatment of the pipe to be processed. In the apparatus, a processing fluid supply pipe for supplying the processing fluid to the processed pipe, and a swirling flow supply means for supplying a swirling flow swirling around the axis of the processed pipe to the processed pipe, A pipe to be treated is attached to the tip of the swirl flow supply means, and the treatment fluid supply pipe is disposed inside the swirl flow supply means.
The separation distance between the processing fluid supply port at the tip of the processing fluid supply pipe and the base end of the pipe to be processed inserted into the tip of the swirl flow supply means is 0.5 with respect to the inner diameter dimension D1 of the pipe to be processed. ~
The inner diameter of the processing fluid supply pipe is 0.3 to the inner diameter D1 of the pipe to be processed.
It is characterized by being set in the range of 0.5D1.

According to the aforementioned pipe inner surface processing apparatus, the processing fluid in which the processing medium and the transport fluid are mixed is discharged from the processing fluid supply port at the tip of the processing fluid supply pipe into the swirling flow supply means. There, the swirl flow swirling around the axis of the pipe to be treated is joined and supplied into the pipe to be treated.
Here, since the inner diameter of the processing fluid supply pipe is set in the range of 0.3 to 0.5 D1 with respect to the inner diameter D1 of the pipe to be treated, the treatment fluid reaches the base end of the pipe to be treated. Will be efficiently mixed with the swirl flow during
The processing fluid riding on the swirling flow circulates inside the pipe to be processed. Further, the separation distance between the processing fluid supply port at the tip of the processing fluid supply pipe and the base end of the pipe to be processed is the inner diameter dimension D of the pipe to be processed.
By setting in the range of 0.5 to 0.6 D1 with respect to 1, the processing fluid riding on the flow of the swirling flow does not contact the inner surface of the swirling flow supply means, and is applied to the base end of the pipe to be processed. Only when it reaches the point will it come into contact with the inner surface of the pipe to be treated. As a result, the inner surface treatment is performed from the base end of the pipe to be treated, and the swirl flow supply means is not subjected to the inner surface treatment.

Further, the pipe inner surface processing apparatus of the present invention supplies the processing fluid, which is a mixture of the processing medium and the transport fluid, to the inner surface of the pipe to be processed, thereby performing the inner surface treatment of the pipe to be processed. In the apparatus, a processing fluid supply pipe for supplying the processing fluid to the pipe to be processed, a swirling flow forming part in which a swirling flow swirling around the axis of the pipe to be processed is formed, and the swirling flow forming part communicates with the swirling flow forming part. And a swirl type element having an outlet nozzle at the tip of which the pipe to be treated is installed at a coaxial position, and the outlet nozzle is directed from the swirl flow forming portion to a connecting portion with the pipe to be treated. The taper shape has a reduced cross-sectional area, and the inclination angle of the taper is 2
It is characterized in that it is formed in the range of 0 to 30 °.

According to the pipe inner surface processing apparatus described above, the outlet nozzle is formed in the swirl flow forming portion because the cross sectional area of the outlet nozzle decreases from the swirl flow forming portion toward the connecting portion with the pipe to be treated. The swirling flow gradually reduces its swirling diameter and then flows into the inside of the pipe to be treated. here,
The inclination angle of the taper formed on the outlet nozzle is 20 to 30 °
Since the swirl flow is formed in the range of 1, the flow resistance generated when the swirl flow passes through the outlet nozzle is minimized, and the swirl flow smoothly flows into the inside of the pipe to be processed.

Further, a first adapter whose cross-sectional area decreases along the tapered shape is attached to the tip of the outlet nozzle, and the pipe to be treated is attached to the tip of the first adapter. Is characterized by.

According to the pipe inner surface processing apparatus described above, the first adapter whose cross-sectional area decreases along the taper shape formed on the outlet nozzle is attached to the tip of the outlet nozzle, so that the initially set object is removed. It becomes possible to attach a pipe to be treated having a diameter smaller than that of the treatment pipe to the tip of the first adapter, and the inner surface of the pipe to be treated having a diameter different from that of the pipe to be treated which has been initialized can be appropriately treated.

Further, a second adapter for extending the length of the processing fluid supply pipe coaxially with the processing fluid supply pipe is attached to the tip of the processing fluid supply pipe.

According to the pipe inner surface processing apparatus described above, since the second adapter for extending the length thereof in the direction coaxial with the processing fluid supply pipe is attached to the distal end portion of the processing fluid supply pipe,
The processing fluid is supplied from the processing fluid supply pipe to the processed pipe after flowing through the second adapter. As a result, the distance between the processing fluid supply pipe and the pipe to be treated, which has been separated by the installation of the first adapter, becomes closer via the second adapter, and the processing fluid becomes unnecessary in the outlet nozzle. It is prevented from spreading.

Further, the distance between the base end of the pipe to be processed inserted into the tip of the first adapter and the processing fluid supply port of the tip of the second adapter is the inner diameter Dn of the pipe to be processed. On the other hand, it is set to a range of 0.5 to 0.6 Dn, and the inner diameter dimension of the tip of the second adapter is set to a range of 0.3 to 0.5 Dn with respect to the inner diameter dimension Dn of the pipe to be processed. It is characterized by

According to the pipe inner surface processing apparatus described above, the inner diameter of the tip of the second adapter is set in the range of 0.3 to 0.5 Dn with respect to the inner diameter of the pipe to be processed Dn. The processing fluid and the swirling flow are efficiently mixed until the base end of the processing tube is reached, and the processing fluid riding on the swirling flow flows inside the pipe to be processed. Further, the separation distance between the processing fluid supply port at the tip of the second adapter and the base end of the pipe to be processed is set within the range of 0.5 to 0.6 D1 with respect to the inner diameter dimension D1 of the pipe to be processed. The processing fluid riding on the swirling flow does not come into contact with the inner surface of the outlet nozzle and the first adapter, but comes into contact with the inner surface of the pipe to be processed only when reaching the base end of the pipe to be processed. As a result, the inner surface is processed from the base end of the pipe to be processed, and the inner surface of the outlet nozzle and the first adapter is not processed.

Further, the pipe inner surface treatment method of the present invention performs the treatment of the inner surface of the pipe to be treated by supplying the treatment fluid in which the treatment medium and the transport fluid are mixed to the inner surface of the pipe to be treated. In the method, a mixed fluid producing step of producing a mixed fluid by mixing the treatment medium and the transport fluid, a swirling flow swirling around the axis of the pipe to be treated, and a flow rate ratio of the mixed fluid. A flow rate adjusting step of adjusting the mixed fluid, a swirling flow, and a processing fluid generation step of generating the processing fluid by joining the axial flow flowing in the axial direction of the pipe to be processed; Is supplied to the inner surface of the pipe to be treated.

According to the above-mentioned pipe inner surface processing method, since the flow rate adjusting step of adjusting the flow rate ratio of the swirling flow swirling around the axis of the pipe to be treated and the mixed fluid is included, the mixed fluid is swirling flow. Both flow rates will be adjusted to the ratio of the flow rate at which it is easy to get on. As a result, a sufficient swirling force is applied to the mixed fluid and the mixed fluid is supplied to the inner surface of the pipe to be processed.

Further, the flow rate ratio adjusting step is characterized in that the flow rates of the swirling flow and the mixed fluid are adjusted to a ratio of 10: 1 to 10: 3.

According to the above-mentioned pipe inner surface processing method, the ratio of the flow rate between the swirling flow and the mixed fluid is adjusted to 10: 1 to 10: 3 in the flow rate adjusting step, so that the mixed fluid and the swirling flow are efficiently processed. The mixed air is well mixed, and the mixed air having a sufficient swirling force is supplied to the pipe to be treated.

The method for treating the inner surface of the pipe according to the present invention is to treat the inner surface of the pipe to be treated by supplying the treatment fluid in which the treatment medium and the transport fluid are mixed to the inner surface of the pipe to be treated. In the method, a mixed fluid producing step of producing a mixed fluid by mixing the treatment medium and the first transport fluid, and a flow direction of the second transport fluid are in the same direction as the axial direction of the pipe to be treated. An axial flow rectifying step of rectifying an axial flow, wherein the mixed fluid, a swirling flow swirling around the axis of the pipe to be treated, and the axial flow merge to generate the treatment fluid. The method is characterized by comprising a process fluid generation step and a process fluid supply step of supplying the process fluid to the inner surface of the pipe to be processed.

According to the above-mentioned pipe inner surface treatment method, the treatment fluid generated by the mixture of the generated mixed fluid, the axial flow and the swirling flow is supplied to the inner surface of the pipe to be treated. Become. As a result, the processing fluid flows in the axial direction of the pipe to be processed while drawing a spiral trajectory on the inner surface of the pipe to be processed. Here, since the axial flow is rectified by the axial flow rectification process into a flow in a direction coaxial with the pipe to be treated, the treatment fluid smoothly flows in the axial direction of the pipe to be treated without hitting the inner surface of the pipe to be treated. It will be distributed to.

[0045]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a pipe inner surface processing apparatus and method according to the present invention will be described with reference to FIGS. In FIG. 1, a pipe inner surface processing apparatus 1
Is a mixed air supply pipe (processing fluid supply pipe) 3 for supplying mixed air in which an abrasive (processing medium) and compressed air (transporting fluid) are mixed to a pipe to be ground (pipe to be processed) 2. ,
Abrasive supply device (processing medium supply means) 4 for supplying the abrasive to the mixed air supply pipe 3, and the axis 1 of the pipe 2 to be ground.
A vortex type element (swirl flow supply means) 5 for forming a swirl flow RF swirling around 6, a compressor 8 for generating compressed air, and a head 6 for storing the compressed air are main constituent elements.

The mixed air supply pipe 3 has a rear end 3a connected to the header 6 and a front end (processing fluid supply port) 3b reaching the inside of the vortex type element 5. Also,
In the middle of the mixed air supply pipe 3, a valve 13 for adjusting the flow rate of the compressed air supplied from the header 6 into the mixed air supply pipe 3 and an abrasive material stored in a hopper (storage tank) 9 are mixed in the mixed air supply pipe 3. 3 is provided for supplying the abrasive material. Further, a bypass pipe (compressed fluid supply means) 17 which is branched from the mixed air supply pipe 3 upstream of the installation position of the abrasive supply device 4 and is connected to the upper part of the hopper 9 is attached. There is. In the middle of the bypass pipe 17, the mixed air supply pipe 3 to the bypass pipe 1
A valve 18 for adjusting the flow rate of the compressed air supplied to the hopper 9 via the valve 7 is installed.

The abrasive material supply device 4 is provided at the connection position of the mixed air supply pipe 3 and the hopper 9 so that the mixed air supply pipe 3 and the hopper 9 communicate with each other, and as shown in FIG. An abrasive material supply amount adjusting valve 10 for adjusting the amount of the abrasive material supplied from 9 to the mixed air supply pipe 3 and a diffuser (processing medium suction means) 7 are provided. The diffuser 7 is installed on the upstream side dividing surface 3c of the mixed air supply pipe 3 divided in the longitudinal direction, and has a tapered portion from the upstream side to the downstream side (left to right direction in the drawing) of the mixed air supply pipe 3. The parallel portion and the divergent portion are sequentially formed. In addition, the mixed fluid supply pipe 3 facing the diffuser 7
The downstream divided surface 3d is formed such that its opening is expanded into a substantially trumpet shape.

As shown in FIG. 3, the vortex flow element 5 has a swirl flow forming portion 5a which forms a hollow space having a short cylindrical shape, and an outlet nozzle which is connected to the downstream side of the swirling flow forming portion 5a and has a tapered cross-sectional area. 5b, and is fixed in a state where the upstream end (base end) 2a of the pipe to be ground 2 is inserted into the tip portion 5e of the outlet nozzle 5b. Here, the distance between the tip 3b of the mixed air supply pipe 3 and the upstream end 2a of the pipe to be ground 2 inserted and installed in the vortex type element 5 is the inner diameter dimension D1 of the pipe 2 to be ground. It is set in the range of 0.5 to 0.6D1, and the inner diameter dimension of the mixed air supply pipe 3 is set to the range of 0.3 to 0.5D1 with respect to the inner diameter dimension D1 of the pipe 2 to be ground. The axis 16 in FIG. 1 indicates the axis of the pipe to be ground 2, and at least the circle center of the outlet nozzle tip 5e, the circle center of the swirl flow forming portion 5a, and the circle center of the mixed air supply pipe tip 3b are to be ground. It is formed coaxially with the axis 16 of the tube 2.

The vortex flow element 5 has two pipes 1 for supplying compressed air from the header 6 into the swirl flow forming portion 5a.
1, 12 are connected. These two pipes 11,1
Reference numeral 2 is a compressed air supply pipe (air supply pipe for swirl flow) 11 and a compressed air supply pipe (air supply pipe for axial flow) 12 as shown in FIG. A tip end 11b of the swirl flow air supply pipe 11 is connected to a compressed air supply port (swirl flow generation air supply port) 5c opened in a tangential direction on the inner circumference of the swirl flow forming portion 5a. The tip 12b of the axial flow air supply pipe 12 is connected to a compressed air supply port (axial flow generation air supply port) 5d opened toward the center of the swirl flow forming portion 5a. The rear end 11a of the swirling air supply pipe 11 and the axial air supply pipe 12
Both rear ends 12a are connected to the header 6, and valves 14 and 15 for adjusting the flow rate of the compressed air supplied from the header 6 into the respective pipes are installed in the middle of both pipes ( (See FIG. 1).

A pipe inner surface processing apparatus 1 having the above-mentioned components
According to the method, the inner surface of the pipe to be ground 2 is ground as follows.

The high-pressure air compressed by the compressor 8 is supplied via the header 6 into the mixed air supply pipe 3, the swirling air supply pipe 11 and the axial flow air supply pipe 12, respectively.

The air is supplied into the mixed air supply pipe 3, and the valve 1
When the compressed air, the flow rate of which is adjusted by the opening degree of 3, reaches the diffuser 7, the compressed air flows through the tapered portion in the diffuser 7 to increase the flow velocity and the divergent portion to increase the pressure. And is discharged to the downstream divided surface 3d of the mixed air supply pipe 3. At that time, the fluid near the outlet of the diffuser 7 is drawn into the flow of the compressed air discharged to the downstream divided surface 3d of the mixed fluid supply pipe 3 due to the ejector effect, and the hopper 9 causes the abrasive material supply amount adjusting valve 10 to operate. The abrasive supplied into the mixed air supply pipe 3 via the compressed air is also drawn into the compressed air (mixed fluid generation step). Thereby, the abrasive material supplying device 4
The mixed air MF in which the compressed air and the abrasive are mixed is circulated inside the mixed air supply pipe 3 on the downstream side. Then, the mixed air MF is discharged from the tip 3b of the mixed air supply pipe 3 into the outlet nozzle 5b formed in the swirl element 5.
Is discharged to.

On the other hand, the mixed air supply pipe 3 to the bypass pipe 1
The compressed air, which is supplied to the inside of the bypass pipe 7 and whose flow rate is adjusted by the opening degree of the valve 18, flows from the tip of the bypass pipe 17 to the hopper 9
Is supplied inward. Then, this compressed air pressurizes the abrasive material in the hopper 9, and the abrasive material in the hopper 9 sequentially follows the opening degree of the abrasive material supply amount adjusting valve 10.
And is discharged to the abrasive material supplying device 4.

The compressed air, which is supplied into the swirl flow air supply pipe 11 and whose flow rate is adjusted by the opening degree of the valve 14, is supplied from the tip 11b of the swirl flow air supply pipe 11 to the swirl flow generation air supply port 5c. Supplied with. Then, the compressed air flows along the inner circumference of the swirl flow forming portion 5a, and the swirl flow RF swirling inside the swirl flow forming portion 5a is formed. The swirl flow RF is generated by the swirl flow forming unit 5
It will flow from a to the exit nozzle 5b.

Further, the compressed air, which is supplied into the axial flow air supply pipe 12 and whose flow rate is adjusted by the opening degree of the valve 14, supplies the axial flow generation air from the tip 12b of the axial flow air supply pipe 12. It is supplied to the mouth 5d. Then, the compressed air flows from there toward the center of the swirl flow forming portion 5a toward the radially inner side of the swirl flow forming portion 5a,
It will flow to the outlet nozzle 5b. here,
Since the outlet nozzle 5b is extended in the axial direction of the pipe 2 to be ground, the compressed air from the air supply pipe 12 for axial flow flows in the axial direction of the pipe 2 to be ground while flowing through the outlet nozzle 5b. Axial flow CF will be formed.

As described above, in the main pipe inner surface processing apparatus 1, the mixed air MF, the swirling flow RF, and the axial flow CF, which are respectively generated, merge in the vortex type element 5 to generate a processing fluid (processing fluid). Generation process). Here, before the mixed air MF and the swirling flow RF flow into the vortex type element 5,
The flow rate ratio between the two is appropriately adjusted (flow rate ratio adjusting step). For example, by adjusting the flow rates of the swirling flow RF and the mixed air MF at a ratio of 10: 1 to 10: 3, the mixed air MF can easily ride on the flow of the swirling flow RF and the mixing on the flow of the swirling flow RF can be performed. The air MF flows through the inside of the pipe 2 to be ground (process fluid supply step).

Further, by setting the inner diameter of the mixed air supply pipe 3 in the range of 0.3 to 0.5D1 with respect to the inner diameter D1 of the pipe 2 to be ground, the mixed air MF is swirled R
It becomes easier to ride on the flow of F, and the mixed air MF riding on the flow of the swirling flow RF flows through the inside of the pipe 2 to be ground. Further, if the distance between the tip 3b of the mixed air supply pipe 3 and the upstream end 2a of the pipe to be ground 2 is set within the range of 0.5 to 0.6D1 with respect to the inner diameter dimension D1 of the pipe to be ground 2, the swirling flow is generated. The mixed air MF riding on the flow of RF comes into contact with the inner surface of the pipe 2 to be ground only when it reaches the upstream end 2a of the pipe 2 to be ground, and does not contact the inner surface of the outlet nozzle 2b. As a result, the inner surface of the outlet nozzle 2b is not ground, and the inner surface of the pipe to be ground 2 is ground from the upstream end 2a.

By the way, flow resistance occurs when the processing fluid flows through the pipe to be ground 2. The longer the pipe to be ground 2 is, the pipe to be ground 2 and the mixed air supply pipe 3 communicating therewith.
The internal pressures of etc. increase successively. Here, in the conventional pipe inner surface processing apparatus 101, since the abrasive is freely dropped from the hopper 109 and supplied to the abrasive supply pipe 103, the abrasive in the hopper 109 also changes in pressure in the mixed air supply pipe 103. Will be affected by. Therefore, the mixed air supply pipe 1
If the pressure in 03 fluctuates, the abrasive material supply amount adjustment valve 110
Despite the constant opening, the supply amount of abrasives fluctuated. Further, if the length of the pipe to be ground 2 is too long, the abrasive in the hopper 9 cannot fall to the mixed air supply pipe 3 at all. On the other hand, in the pipe inner surface processing apparatus 1 according to the present embodiment, the bypass pipe 17 for supplying the compressed air is provided in the hopper 9, and the abrasive in the hopper 9 is pressurized by the compressed air from the bypass pipe 17. Therefore, the abrasive is pushed out from the hopper 9 to the mixed air supply pipe 3 based on the opening of the abrasive supply amount adjusting valve 10 without being affected by the pressure fluctuation in the pipe due to the flow resistance of the processing fluid. Will be done. As a result, even when performing a grinding operation on a pipe to be ground having a long pipe length, it is possible to always supply the grinding material controlled to an appropriate supply amount to the pipe to be ground, thereby improving the grinding accuracy. It will be.

Further, the abrasive material supplied from the hopper 9 to the mixed air supply pipe 3 is sucked into the compressed air by the ejector effect of the compressed air discharged from the diffuser 7, and is supplied to the pipe 2 to be ground. Be guided. Here, the flow of the compressed air discharged from the diffuser 7 has a sufficiently large cross-sectional area with respect to the flow of the compressed air discharged from the orifice, and the abrasive flows from around the compressed air discharged from the diffuser 7. Will be drawn to. As a result, even if a large amount of abrasive is supplied from the hopper 9 to the mixed air supply pipe 3, the flow of the compressed air discharged from the diffuser 7 is not weakened, and the abrasive is stably supplied to the pipe 2 to be ground. Is supplied to. For example, 1
3 x 1 for the inner surface of the 00A (inner diameter 110.1mm) pipe to be ground
0 ^-3 m ³ / min average flow rate 50 grinding material (3 l / min)
It was confirmed by an experiment that a stable supply was possible at m / s.
As a result, it becomes possible to increase the supply amount of the abrasive material compared to the conventional case and perform the grinding operation, and the grinding time can be shortened. Further, since it is possible to stably supply the abrasive from a small amount to a large amount, it is possible to improve the grinding accuracy. In particular, since it is possible to accurately grasp the grinding amount of the pipe to be ground and the usage amount of the abrasive, it is also suitable for use for decontamination work of the inner surface of the pipe to be radiation controlled.

Further, since the inclination angle of the taper formed in the outlet nozzle 5b of the vortex type element 5 is formed in the range of 20 to 30 °, the flow resistance generated when the swirling flow passes through the outlet nozzle is reduced. It becomes possible to minimize the amount, and the processing fluid riding on the swirling flow can be smoothly circulated into the inside of the pipe to be processed. As a result, the grinding depth per unit time is improved, so that the grinding time can be shortened.

Next, a second embodiment of the pipe inner surface processing apparatus and method according to the present invention will be described with reference to FIGS. 4 and 5. The schematic configuration of the pipe inner surface processing apparatus 31 shown in FIG. 4 is in accordance with the first embodiment of the present invention shown in FIG.
The point different from the configuration of the pipe inner surface processing apparatus 1 according to the first embodiment is that in the first embodiment, a swirl flow forming portion in which the tip 12b of the axial flow air supply pipe 12 is formed in the vortex type element 5. 5a is connected to the axial flow generation air supply port 5d opened toward the center of the shaft 5a (see FIG. 8), the axial flow air supply pipe (axial shaft of FIG. A directional flow supply pipe) 19 is formed concentrically with the mixed air supply pipe 3, and its tip end 19b is connected to an axial flow air supply port 20d opened in the axial direction of the vortex type element 20.

The axial flow air supply pipe 19 is provided with a compressed air intake 19a for taking in compressed air (second transport fluid) near the rear end thereof, and the compressed air intake 19a is provided for the axial flow air supply pipe 19. It is opened toward the center of. Further, a tip end 19b of the axial flow air supply pipe 19 penetrates the swirl flow forming portion 20a inside the vortex type element 20 and reaches the outlet nozzle 20b. Here, the axis 16 indicates the axis of the pipe to be ground 2, and at least the circle center of the outlet nozzle tip 20e and the circle center of the swirling flow forming portion 20a,
The circle center of the mixed air supply pipe tip 3b and the axial flow air supply pipe tip 19b are formed on the same axis as the axis 16 of the pipe to be ground 2. Further, the axial supply air supply pipe 19
A rectifying plate (rectifying means) 21 extending in the axial direction of the axial diverting air supply pipe 19 is provided in the middle of the line. As shown in FIG. 5 showing the BB cross section of FIG. 4, the flow straightening plate 21 extends in the radial direction from the outer peripheral surface of the mixed air supply pipe 3 to the inner peripheral surface of the axial flow air supply pipe 19. It consists of a number of plates, and these plates are arranged in a substantially cross shape. The other end of a pipe (not shown) whose one end is connected to the compressed air intake 19a is connected to a header (not shown), and an axial flow air supply pipe 19 is provided in the middle of this pipe. A valve (not shown) for adjusting the flow rate of the compressed air supplied is provided.

A pipe inner surface processing apparatus 3 having the above-mentioned components
According to 1, the grinding work of the inner surface of the pipe to be ground 2 is performed as follows. The abrasive (processing medium) from the hopper (not shown) and the compressed air (first transport fluid) from the header are mixed in the mixed air supply pipe 3 (mixed fluid generation step), and the mixed abrasive and compression are performed. The mixed air (mixed fluid) MF with the air is discharged from the tip 3b of the mixed air supply pipe 3 to the outlet nozzle 20b formed in the vortex type element 20. Further, the compressed air supplied from the compressed air intake 19a into the axial flow air supply pipe 19 has the axial line because the compressed air intake 19a is opened toward the center of the axial flow air supply pipe 19. While flowing around 16 the whirling component is imparted, it flows in the direction of the pipe to be ground 2 (from left to right in the figure).

However, the axial diverting air supply pipe 19
Since the straightening vane 21 is installed inside, when the compressed air containing the swirling component flows through the straightening vane 21, the swirling component collides with the side surface 21a of the straightening vane 21 and is suppressed. It is rectified into an axial flow CF that flows in the axial direction of the grinding tube 2 (axial flow rectification step). Thereby, the axial flow air supply pipe 19 downstream of the straightening plate 21
Only the axial flow CF circulates inside.

Axial flow C rectified by the rectifying plate 21
F is discharged from the tip 19b of the axial flow air supply pipe 19 to the outlet nozzle 20b in the vortex type element 20, where it merges with the mixed air MF discharged from the tip 3b of the mixed air supply pipe 3. On the other hand, in the swirl flow forming portion 20a of the vortex type element 20, a swirl flow RF swirling around the axis of the pipe to be ground 2 is formed, and this swirl flow RF is generated.
0a will flow into the outlet nozzle 20b. That is, the axial flow CF, the mixed air MF, and the swirling flow RF are first merged in the outlet nozzle 20b, and these are mixed to generate a processing fluid (processing fluid generating step).

Here, in the conventional pipe inner surface processing apparatus 101 and the pipe inner surface processing apparatus 1 of the first embodiment, the swirl flow generation air supply ports 105c, 5a are provided in the swirl flow forming portions 105a, 5a.
5c and the axial flow generating air supply ports 105d and 5d were provided. As a result, the swirl flow forming units 105a, 5
The swirling flow RF and the axial flow CF flowing through the inside of a a interfere with each other in a direction orthogonal to each other, and the swirling force of the swirling flow RF flowing into the outlet nozzles 105b and 5b is weakened. It was On the other hand, in the pipe inner surface processing device 31 of the second embodiment, the swirling flow RF and the axial flow CF do not join in the middle but join in the outlet nozzle 20c for the first time, so that the swirling force is attenuated. (Flow in the radial direction of the swirl flow) is not given to the swirl flow RF. As a result, a sufficient swirling force is applied to the mixed air MF, and the mixed air MF is supplied to the inside of the pipe 2 to be ground (process fluid supply step). Then, since the grinding depth per unit time is improved, the grinding time can be shortened. Further, since the axial flow CF is rectified by the flow straightening plate 21 into a flow in the axial direction of the pipe 2 to be ground, it can flow through the inside of the pipe 2 to be ground without being hit against the inner surface of the pipe 2. Becomes As a result, the grindable axial distance is extended, and it becomes possible to grind a pipe to be ground longer than in the past, and the efficiency of grinding work is improved.

Here, in the present embodiment, since the tip end 19b of the axial flow air supply pipe 19 is extended to the inside of the outlet nozzle 20b, when the axial flow CF and the swirling flow RF merge. It is possible to suppress turbulence and vibration of the generated flow. Further, it is possible to further reduce the flow resistance of the swirling flow RF by increasing the curve of the connection portion 20f of the swirling flow forming portion 20a of the vortex type element 20 and the outlet nozzle 20b. As a result, it becomes possible to carry out a stable grinding operation even for a large diameter pipe to be ground which requires a large amount of compressed air.

The flow velocity of the mixed air MF and the axial flow CF is set by forming a double pipe in which the ratio of the inner diameters of the mixed air supply pipe 3 and the axial flow air supply pipe 19 is approximately 1: 2. Are substantially the same, which is preferable.
Further, in order to remove the swirling component of the compressed air flowing in the axial flow air supply pipe 19, the straightening plate 21 is installed and the mixed air supply pipe 3 and the axial flow air supply pipe 19 are installed.
It is desirable to form the concentric portion due to 10 to 10d with respect to the inner diameter d of the mixed air supply pipe 3. By the way, the shape of the rectifying plate 21 is not limited to the shape shown in FIG. 5, and may be any shape as long as it has a rectifying effect. For example, the compressed air intake 19
By opening a in the axial direction of the pipe 2 to be ground, it becomes possible to suppress the swirling component when the compressed air flows into the air supply pipe 19 for axial flow, and the number of plates 21 is three. It can be reduced to the following.

FIG. 6 shows, as a third embodiment, the swirl type element 5 and the adapters 22 and 23 attached to the tips of the mixed air supply pipe 3. The overall structure of the pipe inner surface processing apparatus not shown in FIG. 6 conforms to the structure of the first embodiment of the present invention shown in FIG. The adapter (first adapter) 22 has a rear end (left side in the figure) 22a connected to a tip 5e of an outlet nozzle 5b formed in the vortex type element 5, and the adapter 22 and the vortex type element 5 are fixed by a bolt. ing. Further, the opening 22c formed in the adapter 22 has a cross-sectional area that gradually decreases along the tapered shape of the outlet nozzle 5b, and the tip 22b is fixed with the upstream end 24a of the pipe 24 to be ground inserted. ing.

The adapter (second adapter) 23 is fixed with its rear end 23a inserted into the tip 3b of the mixed air supply pipe 3. The adapter 23 extends coaxially with the mixed air supply pipe 3, and its tip (processing fluid supply port) 23b reaches the vicinity of the upstream end 24a of the pipe 24 to be ground. Specifically, the distance between the tip 23b of the adapter 23 and the upstream end 24a of the pipe 24 to be ground is determined by the distance from the pipe 2 to be ground.
The inner diameter dimension Dn of 4 is set in the range of 0.5 to 0.6 Dn. Further, the inner diameter of the tip 23b of the adapter 23 is 0.
It is set in the range of 3 to 0.5 Dn.

By attaching the adapter 22 to the eddy current type element 5, it becomes possible to attach a pipe to be ground having a diameter smaller than the initially set pipe to be ground to the tip 22b of the adapter 22 and perform the grinding operation. Specifically, it was confirmed by experiments that it is possible to grind a pipe to be ground up to 0.2D1 when the initially set inner diameter of the pipe to be ground is D1. Further, since the taper formed on the outlet nozzle 5b has an inclination angle in the range of 20 to 30 °, the inclination angle of the opening 22c of the adapter 22 is also formed according to the inclination angle of the outlet nozzle. Therefore, the flow resistance generated when the swirl flow passes through the opening 22c from the outlet nozzle 5b can be minimized, and the swirl flow can be smoothly flowed into the inside of the pipe 24 to be ground. Become.

On the other hand, since the adapter 23 is attached to the tip 3b of the mixed air supply pipe 3, the mixed air MF is supplied from the mixed air supply pipe 3 to the ground pipe 24 after flowing through the inside of the adapter 23. It will be. As a result, the distance between the mixed air supply pipe 3 and the pipe to be ground 24, which have been separated by the attachment of the adapter 22, becomes closer via the adapter 23, and the mixed air MF diffuses unnecessarily in the outlet nozzle 5b. Can be prevented.

The inner diameter of the tip 23b of the adapter 23 is 0.3 to 0.
By setting the range of 5Dn, the mixed air MF can easily ride on the flow of the swirling flow RF, and the mixed air MF provided with a sufficient swirling force can be supplied to the inside of the pipe 24 to be ground. . Further, the tip 23b of the adapter 23
And the upstream end 24a of the pipe 24 to be ground are set to a range of 0.5 to 0.6 Dn with respect to the inner diameter dimension Dn of the pipe 24 to be ground, so that the mixed air MF riding on the swirling flow is mixed. The outlet nozzle 5b and the opening 22 of the adapter 22
the upstream end 24 of the pipe 24 to be ground without contacting c
It becomes possible to contact the inner surface of the pipe 24 to be ground for the first time in a. As a result, the upstream end 24 of the pipe 24 to be ground is
The inner surface of the pipe can be ground from a.
b and the opening 22c of the adapter 22 are not ground.

[0074]

According to the pipe inner surface processing apparatus of the present invention, since the compressed fluid supplying means for supplying the compressed fluid to the processing medium in the storage tank is provided, the processing medium stored in the storage tank is supplied with the compressed fluid. The compressed fluid from the means allows it to be extruded into the treatment medium supply means. Therefore, even if the pressure in the pipe to be treated or the treatment fluid supply pipe rises,
The treatment medium can be smoothly supplied from the storage tank to the treatment fluid supply pipe via the treatment medium supply means, and as a result, the treatment medium whose supply amount is appropriately controlled can be always supplied to the treatment target pipe. It becomes possible and the processing accuracy is improved.

Further, according to the present invention, since the processing medium supply means has the processing medium suction means for sucking the processing medium and guiding it to the tube to be processed, the suction force by the processing medium suction means (ejector effect or the like). ) Can be used to guide the processing medium stored in the storage tank to the pipe to be processed. Therefore, it becomes possible to stably supply the processing medium from a small amount to a large amount to the pipe to be processed, and the processing accuracy can be improved.

Further, according to the present invention, since the tip of the axial flow supply pipe penetrates the swirl flow forming portion of the vortex type element and reaches the outlet nozzle, the axial direction of the pipe to be processed flows in the axial direction. The flow is discharged into the outlet nozzle, while the swirling flow swirling around the axis of the tube to be processed is sufficiently formed in the swirling flow forming portion of the swirl type element and then flows into the outlet nozzle. In other words, the axial flow and the swirl flow do not mix in the middle and join together for the first time in the outlet nozzle, so that a flow (a flow in the radial direction of the swirl flow, etc.) that attenuates the swirl force can be applied to the swirl flow. Absent. Therefore, it is possible to pass the swirling flow in the axial direction of the pipe to be treated while maintaining the momentum of the swirling flow swirling around the axis of the pipe to be treated, improving the processing depth per unit time. Therefore, the processing time can be shortened.

Further, according to the present invention, an axial flow supply pipe for supplying an axial flow flowing in the axial direction of the pipe to be treated to the pipe to be treated and a treatment fluid for supplying the treatment fluid to the pipe to be treated. Since the supply pipe and the supply pipe are arranged concentrically with each other, the axial flow and the processing fluid can be smoothly circulated in the axial direction of the pipe to be processed without being evenly contacted with the inner surface of the pipe to be processed. Therefore, the processable axial distance is extended, and it becomes possible to process a pipe to be processed longer than in the past, and the efficiency of the processing work is improved.

Further, according to the present invention, since the axial flow supply pipe is provided with the rectifying means for rectifying the flow of the transport fluid flowing therein to the flow in the coaxial direction with the pipe to be treated, Even if the flow direction of the transport fluid flowing into the flow supply pipe is different from the axial direction of the pipe to be treated, the flow can be adjusted to the flow coaxial with the pipe to be treated and supplied to the pipe to be treated. It will be possible. Therefore, the axial flow smoothly flows in the axial direction of the pipe to be processed, without hitting the inner surface of the pipe to be processed. As a result, the axial distance that can be processed is extended, and it becomes possible to process a pipe to be processed that is longer than in the past, and the efficiency of the processing work is improved.

According to the present invention, the inner diameter of the processing fluid supply pipe is 0.3 to the inner diameter D1 of the pipe to be processed.
By setting it in the range of 0.5D1, it becomes possible to efficiently mix the processing fluid and the swirling flow until the base end of the pipe to be processed is reached. Therefore, the processing fluid riding on the flow of the swirling flow can be circulated inside the pipe to be processed, and the processing efficiency can be improved. further,
The separation distance between the processing fluid supply port at the tip of the processing fluid supply pipe and the base end of the pipe to be processed is 0.5 with respect to the inner diameter dimension D1 of the pipe to be processed.
Since it is set in the range of ~ 0.6D1, the processing fluid riding on the flow of the swirl flow does not come into contact with the inner surface of the swirl flow supply means without contacting the inner surface of the pipe to be processed at the base end of the pipe to be processed. It is possible to make contact. Therefore, the inner surface of the pipe can be processed from the base end of the pipe to be processed, and the inner surface of the swirling flow supply means is not processed.

Further, according to the present invention, since the inclination angle of the taper formed in the outlet nozzle is formed in the range of 20 to 30 °, the flow resistance generated when the swirling flow passes through the outlet nozzle is reduced. It becomes possible to minimize the amount, and the processing fluid riding on the swirling flow can be smoothly circulated into the inside of the pipe to be processed. Therefore, since the processing depth per unit time is improved, the processing time can be shortened.

Further, according to the present invention, since the first adapter whose cross-sectional area decreases along the taper shape formed on the outlet nozzle is attached to the tip of the outlet nozzle, the pipe to be processed which has been initially set is It becomes possible to perform the inner surface treatment by attaching a pipe to be treated having a small diameter to the tip of the first adapter.

Further, according to the present invention, since the second adapter for extending the length of the processing fluid supply pipe coaxially with the processing fluid supply pipe is attached to the distal end portion of the processing fluid supply pipe, the processing fluid is fed from the processing fluid supply pipe to the first portion. It can be supplied to the pipe to be processed after being circulated in the second adapter. Therefore, the distance between the processing fluid supply pipe and the pipe to be treated, which has been separated by the installation of the first adapter, is brought closer through the second adapter, and unnecessary diffusion of the processing fluid in the outlet nozzle occurs. Can be prevented.

Furthermore, according to the present invention, the inner diameter dimension of the second adapter tip is 0.
By setting it in the range of 3 to 0.5 Dn, it becomes possible to efficiently mix the processing fluid and the swirling flow until the base end of the pipe to be processed is reached. Therefore,
The processing fluid riding on the swirling flow can be circulated inside the pipe to be processed, and the processing efficiency can be improved. Further, the separation distance between the base end of the pipe to be processed and the processing fluid supply port at the tip of the second adapter is set within the range of 0.5 to 0.6 Dn with respect to the inner diameter dimension Dn of the pipe to be processed. It is possible to contact the inner surface of the pipe to be treated for the first time at the base end of the pipe to be treated without contacting the inner surface of the outlet nozzle and the inner surface of the first adapter with the treatment fluid riding on the swirling flow. Therefore, the inner surface of the pipe can be processed from the base end of the pipe to be processed, and the inner surfaces of the outlet nozzle and the first adapter are not processed.

Further, according to the pipe inner surface treating method of the present invention,
Since the flow rate ratio adjusting step for adjusting the flow rate ratio of the swirling flow swirling around the axis of the pipe to be processed and the mixed fluid is included, both flow rates are adjusted to the ratio of the flow rate at which the mixed fluid easily rides on the swirling flow. be able to. Therefore, it becomes possible to apply a sufficient swirling force to the mixed fluid and supply the mixed fluid to the inner surface of the pipe to be processed, and the processing depth per unit time is improved, so that the processing time can be shortened.

Further, according to the present invention, in the flow rate adjusting step, the flow rate ratio between the swirling flow and the mixed fluid is set from 10: 1 to 1: 1.
By adjusting the ratio to 10: 3, the mixed fluid and the swirling flow can be efficiently mixed, so that it becomes possible to apply a sufficient swirling force to the mixed fluid and supply the mixed fluid to the inner surface of the pipe to be treated. Therefore, the processing depth per unit time is improved, and the processing time can be shortened.

Further, according to the present invention, since the axial flow is rectified by the axial flow rectification step into a flow in a direction coaxial with the pipe to be treated, the treatment fluid is smoothed without being unevenly contacted with the inner surface of the pipe to be treated. Then, it is distributed in the axial direction of the pipe to be treated. Therefore, the processable axial distance is extended, and it becomes possible to process a pipe to be processed longer than in the past, and the efficiency of the processing work is improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a pipe inner surface processing apparatus according to a first embodiment of the present invention.

FIG. 2 is a view showing an abrasive material supplying device portion of the pipe inner surface processing device according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a vortex type element portion of the pipe inner surface processing apparatus according to the first embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a pipe inner surface processing apparatus according to a second embodiment of the present invention.

5 is a cross-sectional view taken along the line BB of FIG.

FIG. 6 is a cross-sectional view showing an adapter attached to the pipe inner surface processing apparatus according to the first embodiment of the present invention.

FIG. 7 is a conventional pipe inner surface processing apparatus.

FIG. 8 is a sectional view taken along the line BA-A in FIGS. 1 and 7.

FIG. 9 is a view showing an abrasive material supplying device portion of a conventional pipe inner surface processing device.

[Explanation of symbols]

1 Pipe inner surface processing equipment 2 Pipe to be ground (pipe to be processed) 2a Upstream end (base end) 3 Mixed air supply pipe (processing fluid supply pipe) 4 Abrasive material supply device (processing medium supply means) 5 Eddy current element 5a Swirling flow forming section 5b outlet nozzle 5c Air supply port for swirling flow generation 5d Air supply port for axial flow generation 5e tip 7 Diffuser (processing medium suction means) 9 hoppers (storage tanks) 11 Swirling air supply pipe 11a rear end 11b tip 12 Air supply pipe for axial flow (axial flow supply pipe) 12a rear end 12b tip 16 axis 17 Bypass pipe (compressed fluid supply means) 18 valves 19 Axial flow air supply pipe (axial flow supply pipe) 19a Compressed air intake 19b tip 20 Eddy current element 20a swirl flow forming part 20b outlet nozzle 21 Rectifier plate (rectifier means) 22 Adapter (first adapter) 23 Adapter (second adapter) 24 Pipe to be ground (pipe to be processed) Dn, D1 Inside diameter of pipe to be ground (pipe to be processed) CF axial flow MF Mixed air (processing fluid, mixed fluid) RF swirling flow

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hideo Saiki             1-1 1-1 Wadasaki-cho, Hyogo-ku, Kobe-shi, Hyogo             No. Mitsubishi Heavy Industries, Ltd.Kobe Shipyard (72) Inventor Noboru Kurokawa             1-1 1-1 Wadasaki-cho, Hyogo-ku, Kobe-shi, Hyogo             No. Mitsubishi Heavy Industries, Ltd.Kobe Shipyard

Claims (13)

[Claims] 1. A pipe inner surface treatment apparatus for treating the inner surface of a pipe to be treated by supplying the treatment fluid, which is a mixture of a treatment medium and a transport fluid, to the inner face of the pipe to be treated. A processing fluid supply pipe for supplying the processing medium to the processing pipe, a processing medium supply means for supplying the processing medium stored in a storage tank to the processing fluid supply pipe, and a compression for supplying a compressed fluid to the processing medium in the storage tank. A pipe inner surface processing apparatus comprising: a fluid supply unit. 2. A pipe inner surface treatment apparatus for treating the inner surface of a pipe to be treated by supplying the treatment fluid, which is a mixture of a treatment medium and a transport fluid, to the inner face of the pipe to be treated. A treatment fluid supply pipe for supplying the treatment medium to the treatment pipe; and a treatment medium supply means for supplying the treatment medium stored in a storage tank to the treatment fluid supply pipe. A pipe inner surface processing apparatus having a processing medium suction means for sucking and guiding the processing medium to the processing target tube. 3. A pipe inner surface processing apparatus for treating the inner surface of a pipe to be treated by supplying the treatment fluid, which is a mixture of a treatment medium and a transport fluid, to the inner surface of the pipe to be treated. A swirl flow-forming element having a swirl flow formation part in which a swirl flow swirling around is formed, and an outlet nozzle communicating with the swirl flow formation part and having an outlet nozzle at a tip end portion of which the pipe to be treated is installed at a coaxial position, An axial flow supply pipe that supplies an axial flow flowing in the axial direction of the pipe to be processed to the pipe to be processed, and a tip of the axial flow supply pipe penetrates a swirl flow forming portion of the vortex type element. The inner surface of the pipe, which reaches the outlet nozzle. 4. A pipe inner surface treatment apparatus for treating the inner surface of a pipe to be treated by supplying the treatment fluid, which is a mixture of a treatment medium and a transport fluid, to the inner face of the pipe to be treated. A treatment fluid supply pipe for supplying to the treatment pipe; and an axial flow supply pipe for supplying an axial flow flowing in the axial direction of the treatment pipe to the treatment pipe, wherein the treatment fluid supply pipe and the axial direction A flow supply pipe is arranged concentrically, and is a pipe inner surface processing device. 5. A pipe inner surface processing apparatus for treating the inner surface of a pipe to be treated by supplying a treatment fluid, which is a mixture of a treatment medium and a transport fluid, to the inner face of the pipe to be treated, wherein the axis of the pipe to be treated is An axial flow supply pipe for supplying an axial flow flowing in a direction to the pipe to be processed, wherein the pipe to be processed is provided with a flow of a transport fluid flowing in the axial flow supply pipe. And a rectifying means for rectifying the flow in a coaxial direction with the pipe inner surface processing apparatus. 6. A pipe inner surface treatment apparatus for treating the inner surface of a pipe to be treated by supplying the treatment fluid, which is a mixture of a treatment medium and a transport fluid, to the inner face of the pipe to be treated. A processing fluid supply pipe for supplying to the processing pipe, and a swirl flow supply means for supplying a swirl flow swirling around the axis of the pipe to be processed to the pipe to be processed are provided, and a tip end portion of the swirl flow supply means Is mounted with the pipe to be treated, and the treatment fluid supply pipe is arranged inside the swirl flow supply means, and the treatment fluid supply port at the tip of the treatment fluid supply pipe and the swirl flow supply means are provided. The distance from the base end of the pipe to be processed inserted into the distal end portion is 0.5 with respect to the inner diameter dimension D1 of the pipe to be processed.
To 0.6D1, and the inner diameter of the treatment fluid supply pipe is set to the range of 0.3 to 0.5D1 with respect to the inner diameter D1 of the pipe to be treated. Surface treatment equipment. 7. A pipe inner surface treatment apparatus for treating the inner surface of a pipe to be treated by supplying the treatment fluid, which is a mixture of a treatment medium and a transport fluid, to the inner face of the pipe to be treated. A processing fluid supply pipe to be supplied to the processing pipe, a swirling flow forming part in which a swirling flow swirling around the axis of the pipe to be processed is formed, and the pipe to be processed is connected to the swirling flow forming part and has a tip portion. Is provided with a swirl type element having an outlet nozzle installed at a coaxial position, and the outlet nozzle has a tapered shape in which a cross-sectional area decreases from the swirl flow forming portion toward the connection portion with the pipe to be processed. And an inclination angle of the taper is formed in a range of 20 to 30 °. 8. A first adapter, the cross-sectional area of which is reduced along the tapered shape, is attached to the tip of the outlet nozzle, and the pipe to be treated is attached to the tip of the first adapter. The pipe inner surface processing device according to claim 7, wherein: 9. The pipe according to claim 8, wherein a second adapter for extending the length of the processing fluid supply pipe coaxially with the processing fluid supply pipe is attached to a tip end portion of the processing fluid supply pipe. Surface treatment equipment. 10. The distance between the base end of the pipe to be processed inserted into the tip of the first adapter and the processing fluid supply port of the tip of the second adapter is the inner diameter Dn of the pipe to be processed. 0.5 to 0.6 Dn, and the inner diameter dimension of the second adapter tip is set to 0.3 to 0.5 Dn with respect to the inner diameter dimension Dn of the pipe to be processed. The pipe inner surface processing device according to claim 9, wherein 11. A process fluid, which is a mixture of a process medium and a transport fluid, is supplied to an inner surface of a pipe to be processed,
A pipe inner surface treatment method for treating an inner surface of a pipe to be treated, comprising: a mixed fluid producing step of producing a mixed fluid by mixing the treatment medium and the transport fluid; and swirling around an axis of the pipe to be treated. A swirl flow, a flow rate ratio adjusting step of adjusting a flow rate ratio of the mixed fluid, the treatment fluid by combining the mixed fluid, the swirl flow, and an axial flow flowing in the axial direction of the pipe to be treated. And a treatment fluid supplying step in which the treatment fluid is supplied to the inner surface of the pipe to be treated. 12. The pipe inner surface processing method according to claim 11, wherein in the flow rate adjusting step, the flow rates of the swirling flow and the mixed fluid are adjusted to a ratio of 10: 1 to 10: 3. . 13. By supplying a treatment fluid, which is a mixture of a treatment medium and a transport fluid, to the inner surface of the pipe to be treated,
A method for treating the inner surface of a pipe to be treated, comprising: a mixed fluid producing step of producing a mixed fluid by mixing the treatment medium and a first transport fluid; and a flow direction of the second transport fluid. An axial flow rectifying step of rectifying an axial flow in the same direction as the axial direction of the pipe to be treated, the mixed fluid, a swirling flow swirling around the axis of the pipe to be treated, and the axial flow. And a treatment fluid supply step of supplying the treatment fluid to the inner surface of the pipe to be treated.