JPH063274B2 - Fluid fitting - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fluid coupling suitable for connecting pipes that absorb high-pressure water.

“Conventional Technology” In the water jet blasting method (WJB method) that has been conventionally used for the tunnel excavation method, as shown in FIG. On the other hand, a large number of blast holes I are formed, and slits (cut grooves) 2 are formed in the blast holes I in advance. The reason for forming the slit 2 is to cause the pressure due to blasting to act effectively along the direction of the slit 2 and to make the blasting surface smooth.

By the way, in order to form the blast hole I and the slit 2 in the above-mentioned construction method, after forming the blast hole I using a rock drilling machine (drifter etc.) equipped with a drilling tool consisting of a rod and a drill bit, the drill bit and the rod are formed. From the blast hole I,
After that, a high-pressure water lance for forming a slit is inserted into the blast hole I, and the high-pressure water is ejected while the high-pressure water is ejected to form the slit 2.
In this work, there is a problem that the time for pulling out the drill bit and the rod and the time for inserting the high-pressure water lance are completely lost. Therefore, the applicant of the present invention has previously developed a drifter having a new structure incorporating a high-pressure water lance. However, when the slit 2 is formed using this drifter, due to the work of forming the slit 2 in various directions as shown in FIG. Since it is preferable that the direction can be obtained, further, the high pressure hose connected to the high pressure pump is always connected, and it is desired to switch on / off the high pressure pump or the valve as necessary. It is necessary to incorporate a fluid coupling that can meet the above-mentioned requirements into the high-pressure water pipe.

Here, an example of a conventionally known fluid coupling is shown in FIG. 5. The conventional swivel coupling 4 shown in FIG. 5 rotates inside a tubular body 5 having an inverted T-shaped hollow portion formed therein. The connecting pipe 6 is freely inserted to prevent the connecting pipe 6 from coming off, and the sealing material 7 is provided between the outer peripheral surface of the communicating pipe 6 and the inner peripheral surface of the tubular body 5 at the sliding portion.
Is provided.

"Problems to be Solved by the Invention" In the conventional fluid coupling 4 shown in FIG. 5, the sealing material 7 is constantly exposed to high-pressure water, and furthermore, the communication pipe 6 is in contact with the sealing material 7. Seal member 7
However, there is a drawback in that it is hard to wear and has a problem in waterproofness.

The present invention has been made in view of the above problems, and eliminates the problem of a decrease in water shutoff due to wear of the seal material by eliminating the seal material that was conventionally required for the rotating and sliding portion,
An object of the present invention is to provide a fluid coupling that can obtain a predetermined sealing pressure on a rotary sliding portion without being affected by the pressure of high-pressure water used.

"Means for Solving Problems" The present invention, in order to solve the problems, a stationary outer cylinder,
The flow pipe loosely fitted to the stationary outer cylinder and the flow pipe and the stationary outer cylinder are spaced apart from each other, and move in the length direction of the inner cylinder while contacting the stationary outer cylinder and the flow pipe respectively. A pair of inner cylinder liners freely provided, a flange portion provided on the opening side of the stationary outer cylinder, and a seal member, and a space between the pair of inner cylinder liners on the peripheral wall of the flow pipe. And an inner passage opening to the fluid passage of the flow pipe, an inflow hole communicating with the gap is formed in the stationary outer cylinder, and an urging member is attached to the inner cylinder liner to face the flange portion. A contact convex portion that abuts the flange portion is provided around the end surface of each inner cylinder liner.

"Action" Balances the pressure of the fluid flowing from the inflow hole of the stationary outer cylinder into the gap between the cylindrical liners and the pressure of the fluid flowing into the space formed by the cylindrical liner and the stationary outer cylinder, the flange and the contact protrusion. At the same time, the urging member urges the cylindrical liner to press the contact convex portion of the cylindrical liner against the flange portion with a predetermined force, thereby generating a predetermined sealing force without being affected by the fluid pressure. Further, when the inflow pipe rotates inside the stationary outer cylinder, the contact convex portion rotationally slides with respect to the flange portion,
Since it is not necessary to use the sealing material that has been conventionally used for the sliding portion, the phenomenon of lowering the water stopping property due to the abrasion of the sealing material does not occur.

[Embodiment] FIG. 1 shows a fluid coupling A according to an embodiment of the present invention. The fluid coupling A includes a flow pipe 11 and a flow pipe 11.
The main body is composed of a stationary outer cylinder 12 externally inserted into the inner cylinder liner 13, and inner cylinder liners 13, 13 provided between the stationary outer cylinder 12 and the flow pipe 11.

The distribution pipe 11 has a fluid passage 15 therein, a large diameter portion 16 is formed on a part of the outer circumference of the distribution pipe 11, and is formed on the outer peripheral surface of the large diameter portion 16 so as to be separated from each other. Groove 17
A seal member 18 is inserted in the inner peripheral surface of the large-diameter portion 16 between the concave grooves 17 and 17 and an internal passage 16 a that opens to the fluid passage 15 is formed.

The stationary outer cylinder 12 is formed to have a diameter slightly larger than the width of the large diameter portion 16 and larger than the large diameter portion 16.
An inwardly facing flange portion 20 is integrally formed at the opening portion of the stationary outer cylinder 12, and the inner diameter of the flange portion 20 is slightly smaller than the diameter of the large diameter portion 16, and moreover, the flow pipe 11
Is formed to be slightly larger than the outer diameter of. Then, the large diameter portion 16 is inserted into the stationary outer cylinder 12 inside the flange portion 20, and the flow pipe 11 is inserted therein. An inflow hole 22 to which a high-pressure pipe 21 connected to a high-pressure pump for sending a high-pressure fluid is connected is formed at the center of the stationary outer cylinder 12 in the length direction.

On the other hand, outside the large-diameter portion 16, ring-shaped inner cylinder liners 13, 13 are slidably externally spaced apart from each other and covering the concave groove 17 of the large-diameter portion 16. . A gap K is formed between the inner cylinder liners 13, 13 by being surrounded by the end surfaces 13a, 13a of the inner cylinder liner 13, the stationary outer cylinder 12, and the large diameter portion 16. The inner cylinder liner 13
Seals the inner cylinder liner 13 and the large diameter portion 1 by the seal member 18.
In a state in which the space between 6 is closed in a liquid-tight manner, it is provided along the large diameter portion 16 so as to be slidable in the length direction of the flow pipe 11 while being in contact with the large diameter portion 16 and the stationary outer cylinder 12. Further, among the end faces of each inner cylinder liner 13, the end face 13 facing the flange portion 20.
A contact convex portion 25 is provided around the inner peripheral portion of b. Further, a spring member (urging member) 23 for urging the cylindrical liners 13, 13 away from each other is provided in the gap K, and the cylindrical liner 13, 13 is urged by the spring force of the spring member 23.
The contact convex portions 25 of the inner peripheral surface 26 of the flange portion 20 are
Is abutted against. Then, the contact convex portion 25, the end surface 13b of the inner cylinder liner 13, the stationary outer cylinder 12, and the flange portion 2
A void D is formed by being surrounded by 0 and. The gap K between the cylindrical liners 13, 13 communicates with the inflow hole 22 of the stationary outer cylinder 12 and the internal passage 16 a of the flow pipe 11.

The fluid coupling A configured as described above is, for example, 1000 kg.
Used for connecting high-pressure pipes incorporated in rock drills that absorb high-pressure water of more than / cm ² .

That is, the high-pressure pipe 21 is connected to a high-pressure pump, and the flow pipe 11 is directly or indirectly connected to a rod of a rock drill equipped with a jet nozzle.

Then, when high-pressure water is sent from the high-pressure pump to the high-pressure pipe 21,
The high-pressure water enters the gap K between the cylindrical liners 13 and 13 from the inflow hole 22, moves to the fluid passage 15 of the flow pipe 11 through the internal passage 16a, and flows to the jet nozzle side. At this time, high-pressure water flows into the gap K and the gap D, and the inner cylinder liner 1
Since the high pressure water flows into both sides of 3, the inner cylinder liner 13
Is applied with a slight water pressure resulting from the difference between the area of the end surface 13a on the gap K side of the cylindrical liner 13 and the area of the end surface 13b on the opposite side, and as a result, the biasing force of the spring member 23 is also applied. The cylindrical liners 13 are urged away from each other. In this way, the contact convex portion 25 of the cylindrical liner 13 is pressed against the inner peripheral surface of the flange portion 20 to generate a sealing force.

In the state as described above, the rock drill rod rotates and the flow pipe 1
When 1 rotates, the flow pipe 11 and the cylindrical liner 13,
Both 13 rotate inside the stationary outer cylinder 12. Then, at the time of this rotation, the contact convex portion 25 slides while contacting the flange portion 25 to generate a sealing force. That is, in the above configuration, since there is no sealing material between the flange portion 20 that is the fixed side and the contact convex portion 25 that is the rotating side, the sealing material does not wear due to the rotation, and the waterproofness is reduced. Does not occur. In addition, the contact protrusion 2 is formed by the rotation.
5 may be worn, but when the contact protrusion 25 is shortened due to wear, the water pressure in the gap K and the spring member 23 are reduced.
As the cylindrical liner 25 further approaches the flange portion 20 side by the biasing force of the contact convex portion 25, the contact convex portion 25 is surely brought into contact with the flange portion 20 and a sealing force is generated. Therefore, a predetermined sealing force can be reliably obtained for a long period of time until the contact protrusion 25 is completely worn.

FIG. 2 shows a fluid coupling B of a second embodiment of the present invention. The fluid coupling B of this example has a flange portion 20 formed on the stationary outer cylinder 12 in the fluid coupling A shown in FIG. This shows a joint provided separately from the stationary outer cylinder 12. In the fluid coupling B shown in FIG. 2, the same components as those of the fluid coupling A shown in FIG. 1 are designated by the same reference numerals, and their description will be omitted.

The fluid coupling B of this embodiment has a flange member 31 having an outward flange portion 30 outside the large diameter portion 16 of the flow pipe 11.
Is provided, and the cylindrical liner 32 and the stationary outer cylinder 33 are provided outside the flange member 31.

The flange member 31 is formed so as to be fitted to cover the large diameter portion 16 of the flow pipe 11 and the both end openings of the cylindrical body 35 so as to be located on both sides of the large diameter portion 16. It is composed of an outward flange portion 30 and an inner flange 36 formed so as to sandwich the large-diameter portion 16 between the openings of both ends of the tubular body 35. The tubular body 35 has a transparent passage communicating with the internal passage 16a of the flow pipe 11. The hole 35a is formed.

Inner cylinder liners 32, 32 are provided apart from each other between the flange portions 30, 30 of the flange member 31, and the inner cylinder liners 32, 32 face the flange portion 30.
A contact convex portion 37 is provided around the outer peripheral portion of the end surface of the. A thick portion 38 is formed on the inner surface of the stationary outer cylinder 33, and a concave groove 39 facing the inner cylinder liners 32, 32 is formed on the inner peripheral surface of the thick portion 38. The seal member 40 is inserted.

In the fluid coupling B having the above-described configuration, high-pressure water flows into the gap K from the high-pressure pipe 21, the inner cylinder liner 32 moves, and the contact convex portion 37 thereof comes into contact with the inner peripheral surface of the flange portion 30 to obtain a sealing force. It is a structure. Further, in the structure of this embodiment, the distribution pipe 11
When is rotated, both the flow pipe 11 and the flange member 31 are rotated, and the inner cylinder liner 32 is stationary.

FIG. 3 shows a fluid coupling C of a third embodiment of the present invention. In this embodiment, one of the pair of inner cylinder liners provided in the first embodiment described above is special. It is configured. Other configurations are the same as those in the first embodiment.

That is, in this embodiment, the step portion 50 is formed on the outer peripheral portion of the inner cylinder liner 13 'on the right side in FIG. 3, and the contact convex portion 25 is formed continuously with the step portion 50 to form the inner cylinder liner 13'. In this example, the area of the end surface 13a and the area of the end surface 13b are the same.

In the fluid coupling C having the above-described configuration, the fluid pressure acting on the end surface 13a of the inner cylinder liner 13 and the fluid pressure acting on the end surface 13b of the inner cylinder liner 13 can be made the same, and the left and right inner cylinder liner 13 , 13 'are urged only by the spring 23, and the contact protrusions 25, 25 have the flange portions 20, 20.
To reach the goal.

"Effect of the Invention" As described above, the present invention introduces fluid to both sides of the inner cylinder liner provided between the stationary outer cylinder and the flow pipe, balances the fluid pressure introduced to both sides of the inner cylinder liner, and Since the contact convex portion of the inner cylinder liner is pressed against the flange portion by the biasing member to obtain the sealing force, the predetermined sealing force can be obtained without being influenced by the pressure of the high-pressure fluid to be guided. Therefore, the fluid coupling of the present invention is suitable for connecting pipes that handle high-pressure fluid. In addition, the flow pipe can freely rotate inside the stationary outer cylinder, and the contact convex portion of the inner cylinder liner that abuts the flange portion of the stationary outer cylinder slides by the rotation of the distribution pipe to exert a sealing force. Therefore, even when the contact protrusion is worn and shortened, the inner cylinder liner is urged by the urging member to press the tip of the contact protrusion against the flange portion. There are features that do not occur. Therefore, the fluid coupling of the present invention is suitable for connecting pipes used in a device such as a rock drilling machine that forms a slit in a rock bed in a desired direction, which requires rotation of a pipe through which high-pressure water is passed.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing a second embodiment of the present invention, and FIG. 3 is a third embodiment of the present invention.
4 is a cross-sectional view showing an embodiment, FIG. 4 is a front view showing blast holes and slits formed in rock when tunnel excavation is performed, and FIG.
The figure is a sectional view showing a conventional swivel joint. A, B ... Fluid coupling, K ... Gap, 11 ... Flow pipe, 12, 33 ... Stationary outer cylinder, 13, 32 ... Inner cylinder liner, 15 ... Fluid passage, 16a ... Internal passage, 18 , 40 ... Sealing member, 20, 30 ... Flange portion, 22 ... Inflow hole, 23 ... Spring member (biasing member), 25, 37 ... Contact convex portion.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masayoshi Akada 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Takashi Wada 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd.

Claims (1)

[Claims] 1. A stationary outer cylinder, a distribution pipe loosely inserted in the stationary outer cylinder, and an outer insertion pipe movably in the length direction of the distribution pipe between the stationary outer cylinder and the distribution pipe. A pair of inner cylinder liners, a flange portion provided on the opening side of the stationary outer cylinder, and a seal member interposed between the flow pipe or the stationary outer cylinder and the inner cylinder liner, An inner passage opening to a gap between the pair of inner cylinder liners and a fluid passage in the distribution pipe is formed on a peripheral wall of the distribution pipe, and an inflow hole communicating with the gap is formed in the stationary outer cylinder, A biasing member that biases the inner cylinder liner toward the flange portion is attached to the inner cylinder liner, and the biasing member acts on the inner cylinder liner at an end surface of each inner cylinder liner facing the flange portion. Contact protrusion that abuts the flange portion by the biasing force Fluid coupling, characterized in that formed by circumferentially.