JP3877381B2 - In-pipe coating equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-pipe coating apparatus, and more particularly, to a coating apparatus that centrifugally sprays a resin liquid used as a paint using an in-pipe air flow.
[0002]
[Prior art]
Existing pipes such as gas pipes, water pipes, and communication pipes buried in the ground use metal pipes such as steel pipes and cast iron pipes, or resin pipes such as hard vinyl pipes. Over a long period of time, an aging phenomenon due to corrosion or the like progresses, and a defective portion such as a leak hole may occur in the pipe. This phenomenon is particularly noticeable when a metal tube is used.
[0003]
Conventionally, gas pipes and water pipes that require airtightness are lined with seal tubes on the inner surface of pipes for the purpose of repairing defects and preventive maintenance to prevent the progress of such phenomena against aging phenomena, In addition, a repair technique has been developed in which resin liquid is lined on the inner surface of the pipe to improve the sealing performance of the pipe.
[0004]
As a technique for applying a resin liquid to the inner wall surface of a pipe and performing lining, a packer type lining technique in which the resin liquid is subjected to centrifugal spraying has been proposed (for example, Japanese Patent Publication No. 51-41655).
Since the lining technique described in the above publication has a structure in which the paint spray cup is rotated by an air motor, not only the apparatus itself is increased in size but also the apparatus becomes expensive by incorporating the air motor. Moreover, not only equipment such as air supply pipes to the air motor is required, but also the operation of inserting the pipes into the pipes is necessary. Workability at the time of insertion becomes worse.
[0005]
Therefore, as a lining technique for solving such problems, there is a resin liquid storage part inside and a resin passage communicating with the storage part, and the rotation of the resin passage end forming a plurality of injection ports along the circumferential direction. A possible application cup is provided and rotated by utilizing the air flow in the pipe generated by the differential pressure in the pipe obtained when the cup is pulled in the pipe, and the resin liquid contained in the pipe is centrifuged. A technique for ejecting from an injection port by force has been proposed (for example, Japanese Patent Application No. 8-53428 relating to the prior application of the present application).
[0006]
[Problems to be solved by the invention]
By the way, a relationship between a rotating part and a stationary part is established between a coating cup provided with an injection port for injecting a resin liquid and a member that rotatably supports the coating cup, and a boundary part thereof. Then, it is necessary to avoid an increase in frictional resistance with the stationary part. Therefore, a labyrinth seal structure is conceivable for rotating the coating cup in a floating state by interposing air between the facing portions of the coating cup and the rotation support member so as to make a non-contact relationship therebetween. However, with this structure, when a resin liquid reservoir is formed in the vicinity of the labyrinth seal, the resin liquid may flow into the labyrinth seal, and if the resin liquid hardens within the seal, There is a possibility that smooth rotation of the coating cup is hindered.
[0007]
An object of the present invention is to apply a resin liquid by ensuring a high-speed rotation by effectively applying an air flow in a pipe to a coating cup in view of the problems in the above-described conventional in-pipe coating apparatus, particularly a rotation support portion. An object of the present invention is to provide an in-pipe coating apparatus having a structure capable of preventing the efficiency from being reduced.
[0008]
[Means for Solving the Problems]
In order to achieve this object, the invention according to claim 1 is based on the differential pressure in the pipe obtained when moving in the pipe in the pipe coating apparatus used for forming a coating film using a resin liquid on the inner wall surface of the pipe. A rotating blade that can be rotated by receiving the generated air flow in the pipe and that is provided with a nozzle for applying the resin liquid, and a part of the moving blade is fitted inside the moving blade to form a rotating support, and the moving inside A shaft body having a passage for the resin liquid supplied to the blade, and between the end portion of the moving blade and the end portion of the shaft body facing the end portion in the axial direction of the shaft body, An oil-impregnated mechanical seal capable of coming into contact with the end portion of the moving blade and an oil supply portion including an oil discharge portion facing the mechanical seal are provided.
[0009]
According to a second aspect of the present invention, in the in-pipe coating apparatus according to the first aspect, the oil supply unit includes a seal support member provided with a seal receiving surface facing the oil discharge unit to the mechanical seal, and the seal support member. It is characterized by being comprised by the oil storage member provided with the oil sump connected to an oil discharge part.
[0010]
According to a third aspect of the present invention, in the in-pipe coating apparatus according to the first or second aspect, the oil supply section is given a habit of abutting on the mechanical seal.
[0011]
According to a fourth aspect of the present invention, in an in-pipe coating apparatus used to form a coating film using a resin liquid on the inner wall surface of a pipe, an in-pipe air flow generated by the in-pipe differential pressure obtained when moving in the pipe is received. A rotor blade that is rotatable and includes a nozzle for applying the resin liquid, and a resin liquid that is partly fitted inside the rotor blade to form a rotating support and is supplied to the rotor blade inside Between the end of the moving blade and the end of the shaft opposite to the end in the axial direction of the shaft. It is characterized in that a mechanical seal having a double ring-like flexibility and a low friction coefficient that can be press-contacted and can be press-contacted to the end face side of the moving blade is provided.
[0012]
[Action]
In the first to third aspects of the present invention, the penetration of the resin liquid is prevented by interposing a mechanical seal between the opposed portions of the shaft body and the moving blade. In addition, the shaft body and the moving blade are in contact with each other by interposing a mechanical seal, but the mechanical seal located between them is oil-impregnated and has an oil supply structure. The frictional resistance between the two can be reduced. This makes it possible to eliminate the frictional resistance that impedes the rotation of the rotor blades even when a mechanical seal that is in close contact with both members in order to block the intrusion of the resin liquid. Thus, it is possible to maintain the high-speed rotation of the moving blade and prevent the application efficiency of the resin liquid from being lowered.
[0013]
In the invention according to claim 4, the function of the O-ring that supports the shaft portion and the ingress of the resin liquid are achieved by using a double ring-shaped mechanical seal that can be pressed against the outer peripheral surface of the shaft portion of the shaft body and the end surface on the moving blade side. Both functions of prevention can be achieved with a single member.
[0014]
【Example】
The details of the present invention will be described below with reference to the illustrated embodiments.
FIG. 1 is a cross-sectional view for explaining the configuration of a main part of an in-pipe coating apparatus according to an embodiment of the present invention. In the same figure, the in-pipe coating apparatus 1 causes a resin liquid injection unit and a centrifugal force to be generated in the injection unit. The moving blade is composed of the same member.
That is, the in-pipe coating apparatus 1 includes a moving blade 3 that is rotatably supported by the shaft body 2.
The shaft body 2 has an end plate 2a whose one end in the axial direction is larger in diameter than the shaft portion, and a resin liquid passage 2b is formed in the inside along the axial direction. A guide member 5 having a larger diameter is attached to the end plate 2a via a bolt 4, and a resin liquid supply member (not shown) such as a tank capable of communicating with the resin liquid passage 2b is attached.
The resin liquid passage 2b formed in the shaft body 2 is formed along the axial direction starting from the end plate 2a side, and a plurality of resin liquid discharge paths 2b1 penetrating in the radial direction at the end point located in the middle of the axial direction. Communicated.
Bearings 6 and 7 are inserted into a tip corresponding to the end opposite to the end plate 2a in the axial direction of the shaft body 2 so as to rotatably support a moving blade 3 described later. The guide member 5 is for aligning the center of the pipe line with the center of the in-pipe coating apparatus 1. In this embodiment, the guide member 5 is formed of a substantially dish-shaped elastic body having a corrugated peripheral wall. When inserted into the pipe, the components of the in-pipe coating apparatus 1 are prevented from interfering with the inner wall of the pipe line.
[0015]
The rotor blade 3 is inserted into the bearings 6 and 7 and is rotatably supported, and includes a resin liquid reservoir 3a formed in a space communicating with the resin liquid discharge path 2b1 of the shaft body 2 on the outer peripheral surface. The rotary blade 3b is inserted and supported via the key 8, and a coating nozzle 3c is provided at a position corresponding to the resin liquid reservoir 3a.
The coating nozzle 3c includes a rim portion 3c1 and a spoke portion 3c2 projecting in a diametrical direction at a position equally divided by 4 with respect to the rim portion 3c1, and a resin liquid reservoir 3a on the shaft body 2 side is provided inside the spoke portion 3c2. A communicating resin liquid passage 3c3 is formed. The resin liquid passage 3c3 is opened at a connection position with the rim portion 3c1 so that the resin liquid can be discharged by centrifugal force.
[0016]
On the other hand, a mechanical seal 9 is disposed between the end plate 2a of the shaft body 2 and the end of the rotor blade 3 facing the end plate 2a.
In the case of the present embodiment, the mechanical seal 9 is an oil-containing member made of sintered carbon or the like, and one surface is in contact with the end of the rotor blade 3 in the axial direction of the shaft body 2.
On the other surface of the mechanical seal 9 in the axial direction of the shaft body 2, an oil supply unit 10 is provided so as to face.
As shown in FIG. 2, the oil supply unit 10 includes a seal receiving member 11 and an oil containing member 12, and both the members 11 and 12 are shaft bodies via an O-ring indicated by reference numeral 10 a in FIG. 1. 2 is inserted into the outer peripheral surface.
In FIG. 2, the seal receiving member 11 and the oil containing member 12 have an insertion support hole for the shaft body 2 therein, and the seal receiving member 11 is a cross-sectional shape along the axial direction of the shaft body 2. Is formed in a bush shape having a flange portion at one end.
The oil containing member 12 has a flange portion that can be brought into contact with the flange portion of the seal receiving member 11 at one end in the axial direction, and has a space formed with an inner diameter into which the seal receiving member 11 can be fitted. An oil reservoir 12a is provided.
An oil discharge passage 11a formed in the seal receiving member 11 communicates with the oil reservoir 12a of the oil containing member 12, and this oil discharge passage 11a is configured by a hole penetrating in the axial direction, and one end thereof. Is open at the seal receiving surface 11b.
[0017]
An elastic body 13 for pressing the seal receiving surface 11b of the seal receiving member 11 to the mechanical seal 9 by pressing the seal receiving member 11 and the oil containing member 12 disposed in a state where the flanges are in contact with each other. Is arranged.
The elastic body 13 is composed of a coil spring disposed between the flange portion of the oil containing member 12 and the end plate 2 a of the shaft body 2. By pressing the oil containing member 12, the seal receiving member 11 and the mechanical seal 9 The pressure contact is maintained.
In FIG. 1, the bearings 6 and 7 are prevented from being detached by a seat plate 15 and a cap member 16 which are fastened by a bolt 14 attached to the tip of the shaft body 2, and are attached to the rotor blade 3 through a key 8. The rotor blade 3b is prevented from coming off by a lock nut 17 attached to the rotor blade 3.
[0018]
Since the present embodiment is configured as described above, the elastic body 13, the oil containing member 12 and the seal receiving member 11 are inserted in this order toward the end plate 2 a of the shaft body 2, and then the moving blade 3 is attached to the shaft. It is inserted into the body 2 and assembled. The rotor blade 3 inserted into the shaft body 2 is rotatably supported when the bearings 6 and 7 are fitted into the shaft body 2.
The rotor blade 3 is provided with a rotor blade 3 b in advance, and the rotor blade 3 is attached to the shaft body 2, whereby the rotor blade 3 can rotate independently of the shaft body 2.
When the attachment of the rotor blade 3 to the shaft body 2 is completed, the rotor blade 3 is positioned on the end plate 2 a side of the shaft pair 2 by fastening the bolt 14 and the lock nut 17.
When the moving blade 3 is positioned, a pressing force acts on the elastic body 13, and the seal receiving member 11 fitted in the oil containing member 12 is pressed to the mechanical seal 9 side by the repulsive force. Eleven seal receiving surfaces 11 b are in pressure contact with the mechanical seal 9.
[0019]
The oil reservoir 12 a of the oil containing member 12 is filled with lubricating oil, and is filled in the oil discharge path 11 a of the seal receiving member 11.
Since the lubricating oil filled in the oil discharge passage 11a is in contact with the mechanical seal 9, when the oil is insufficient in the mechanical seal 9, the lubricating oil moves to the mechanical seal 9 due to capillary action and is replenished.
In the in-pipe coating apparatus 1, when the moving blade 3 is rotated by an in-pipe air flow obtained in a pipe line (not shown), the resin liquid filled in the resin liquid passage 2 a in the shaft body 2 by centrifugal force is contained in the moving blade 3. It is guided into the coating nozzle 3c through the resin reservoir 3a and applied by centrifugation.
[0020]
Since the moving blade 3 and the shaft body 2 are in surface contact with each other via the mechanical seal 9, there is no space for the resin liquid to enter the facing portion, and the mechanical seal 9 is filled with lubricating oil. Therefore, the rotation of the rotor blade 3 is not hindered.
[0021]
Next, the invention described in claim 4 will be described. In FIG. 3, the same components as those shown in FIG. 1 are indicated by the same reference numerals.
FIG. 3 is a view for explaining an embodiment of the invention described in claim 4, in which the mechanical seal (indicated by reference numeral 90 for the sake of convenience) is the O-ring (in FIG. 1). , A member indicated by reference numeral 10a).
That is, for the mechanical seal 90, an elastic body having flexibility and a low friction coefficient is used instead of the sintered carbon described in the above embodiment. As such an elastic body, oil-impregnated rubber or resin is used.
The mechanical seal 90 having such flexibility and low friction coefficient has a ring shape with a double cross-sectional shape, an inner ring portion is formed in a wave shape in cross section, and the outer ring portion is an inner surface of the seal receiving member 91. Is in pressure contact.
[0022]
The mechanical seal 90 is loaded in a cup-shaped seal receiving member 91 inserted into the shaft portion of the shaft body 2, and is positioned in the axial direction by a positioning portion (not shown). It is also possible to provide a lid (not shown) to cover one end in the axial direction of the mechanical seal 90, that is, the end opposite to the end facing the resin liquid reservoir 3a.
[0023]
Since the present embodiment is configured as described above, the mechanical seal 90 loaded in the seal receiving member 91 has the inner ring portion pressed against the outer peripheral surface of the shaft portion 2 as shown in FIG. The outer ring portion is in pressure contact with the inner surface of the seal receiving member 91. The pressure contact state at this time is maintained by a spring 94 disposed on the outer peripheral surface of the inner ring portion, and the inner ring portion is prevented from floating.
When the shaft body 2 rotates, the mechanical seal 90 that is in pressure contact with the outer peripheral surface of the shaft portion can also be rotated. For this reason, as for the mechanical seal 90, the ring part tends to bulge outward by centrifugal force. As the ring portion tends to bulge outward, the inner ring portion reduces the contact resistance with the outer peripheral surface of the shaft portion of the shaft body 2 and reduces the rotational resistance of the shaft body 2, while the outer ring portion The ring portion tends to be in pressure contact with the inner surface of the seal receiving member 91.
[0024]
Even when the inner ring portion swells outward due to centrifugal force, the minimum necessary contact state that can prevent the resin liquid from leaking to the outer peripheral surface of the shaft portion 2 by the spring 94 is secured, and the O-ring Function is maintained.
[0025]
According to the present embodiment, the mechanical seal 90 in pressure contact with the outer peripheral surface of the shaft portion of the shaft body 2 can suppress an increase in rotational resistance due to the pressure contact, and even when the rotational resistance is suppressed, the resin Liquid leakage can be prevented.
[0027]
【The invention's effect】
As apparent from the above embodiments, according to the first to third aspects of the present invention, the intrusion of the resin liquid is prevented by interposing a mechanical seal between the opposed portions of the shaft body and the moving blade. In addition, the shaft body and the moving blade are in contact with each other by interposing a mechanical seal, but the mechanical seal located between them is oil-impregnated and has an oil supply structure. The frictional resistance between the two can be reduced. This makes it possible to eliminate the frictional resistance that impedes the rotation of the rotor blades even when a mechanical seal that is in close contact with both members in order to block the intrusion of the resin liquid. Thus, it is possible to maintain the high-speed rotation of the moving blade and prevent the application efficiency of the resin liquid from being lowered.
[0028]
According to the invention of claim 4, the function of the O-ring that supports the shaft portion and the resin liquid can be obtained by using the double ring-shaped mechanical seal that can be pressed against the outer peripheral surface of the shaft portion of the shaft body and the end surface on the moving blade side. It is possible to achieve both functions of preventing the intrusion of a single member, and to reduce the contact resistance with the shaft body by utilizing the centrifugal force due to the rotation of the moving blade using the air flow in the pipe. Therefore, it is possible to prevent the application efficiency of the resin liquid from being lowered without impeding the high-speed rotation of the moving blade with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of an embodiment of an in-pipe coating apparatus according to the present invention.
FIG. 2 is a cross-sectional view for explaining a configuration of a main part of the in-pipe coating apparatus shown in FIG.
FIG. 3 is a sectional view for explaining another embodiment of the in-pipe coating apparatus shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 In-pipe coating apparatus 2 Shaft body 2a Resin liquid path 3 Rotor blade 3a Resin liquid pool 3b Rotor blade 3c Coating nozzle 9, 90 Mechanical seal 10 Oil supply part 11 Seal receiving member 11a Oil discharge path 11b Seal receiving surface 12 Oil accommodating member 12a Oil reservoir 91 Seal receiving member 92 Partition member 93 Lid member

Claims (4)

In the pipe coating device used to form a coating film using a resin liquid on the pipe inner wall surface,
A rotor blade that is rotatable by receiving an air flow in the pipe caused by the differential pressure in the pipe obtained when moving in the pipe, and provided with a nozzle for applying the resin liquid;
A shaft body having a resin liquid passage that is partly fitted inside the rotor blade to form a rotary support and is supplied to the rotor blade,
An oil-impregnated mechanical seal capable of contacting the end of the moving blade between the end of the moving blade and the end of the shaft facing the end in the axial direction of the shaft, An in-pipe coating apparatus, comprising: an oil supply unit including an oil discharge unit facing the mechanical seal. In the pipe coating apparatus according to claim 1,
The oil supply unit includes a seal support member provided with a seal receiving surface that faces the mechanical seal and the oil discharge unit, and an oil storage member provided with an oil reservoir communicating with the oil discharge unit of the seal support member. An in-pipe coating device characterized by The in-pipe coating apparatus according to claim 1 or 2,
An in-pipe coating apparatus characterized in that the oil supply section is given a habit of contacting the mechanical seal. In the pipe coating device used to form a coating film using a resin liquid on the pipe inner wall surface,
A rotor blade that is rotatable by receiving an air flow in the pipe caused by the differential pressure in the pipe obtained when moving in the pipe, and provided with a nozzle for applying the resin liquid;
A shaft body having a resin liquid passage that is partly fitted inside the rotor blade to form a rotary support and is supplied to the rotor blade,
Between the end of the moving blade and the end of the shaft facing the end in the axial direction of the shaft, the shaft can be pressed against the outer peripheral surface of the shaft and on the end surface of the moving blade. An in-pipe coating apparatus comprising a double ring-shaped flexible seal and a mechanical seal having a low coefficient of friction that can be press-contacted.

Images