JP2002349783A - Multiple tube fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tube fitting in which coupling and decoupling work can be easily and securely conducted without requiring installation space even when used for such applications that plural circuits are simultaneously couple and decoupled, and that plural pieces of piping before and after the tube fitting are rotated. SOLUTION: This multiple tube fitting comprises a male metal fitting and a female metal fitting each comprising multiple concentric tubes, and is composed in such a way that an inner circumferential surface or outer circumferential surface of each of the multiple tubes of the male metal fitting is engaged with an outer circumferential surface or inner circumferential surface of each of the multiple tubes of the female metal fitting, where seal material is installed on their engagement parts. In this, numeral 1 in Fig. is the female metal fitting, 2A-2C are inner tubes of the female metal fitting, 3A-3C are outer tubes of the female metal fitting, 4A-4E are the seal material in the female metal fitting, 11 is the male metal fitting, 12A-12C are inner tubes of the male metal fitting, 13A-13C are outer tubes of the male metal fitting, and 14A-14F are the seal material in the male metal fitting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint in which two or more circuits can be constituted by one joint by forming a male fitting and a female fitting into concentric multiple tubes.

[0002]

2. Description of the Related Art Pipe fittings constitute a hydraulic or other circuit by connecting a male fitting and a female fitting. Both the male fitting and the female fitting in the conventional fittings are merely cylindrical. No partition was provided in the cylinder. In other words, it was a pipe joint that could constitute only one circuit.

[0003]

In such a conventional pipe joint, for example, when a reciprocating circuit is formed, the joint of the pipe for the forward path and the joint of the pipe for the return path must be used separately. That is, when configuring a plurality of circuits, pipe fittings corresponding to the number are required.

[0004] However, the use of a plurality of pipe joints requires more installation space. Further, there is a problem that the work of connecting and disconnecting the pipe joints becomes complicated, and the workability deteriorates as the number of circuits increases.

[0005] Further, when a plurality of circuits are used, the use of a pipe joint for each circuit may cause inconvenience in use in applications such as rotating pipes before and after the pipe joint. That is, as such an application, there is a case in which a plurality of excavating work rods vertically passing through a chemical liquid supply path such as cement milk and two hydraulic supply paths are added to the rod, and a pipe joint is provided for each supply path. If used, if rattling occurs in the rotational direction due to wear or the like of the fitting portion of the excavation work rod, the respective pipe joints are in the eccentric position, so that the respective pipe joints are displaced in the rotational direction and cannot be connected.

[0006] As described above, the conventional pipe joint, which can form only one circuit, not only deteriorates installation space and workability when connecting and disconnecting a plurality of circuits at the same time, but also uses the plurality of circuits by rotating them. , There is a problem that the connection itself may not be possible. And
All of these problems can be solved by forming a plurality of circuits concentrically in one fitting.

Therefore, the present inventors have invented a device used in a drilling work rod, and have simple and reliable installation space without requiring a concentric multiple pipe for each of the male and female fittings. Japanese Patent Application Laid-Open No. 2000-38720 discloses a pipe joint capable of performing joining and detaching work on a pipe, but an object of the present invention is to provide a pipe joint having the same function without being provided inside a drilling work rod. It is assumed that.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the gist of the present invention is that a male fitting and a female fitting are each formed of a concentric multiple pipe, and the male pipe is provided with a multiple pipe. Each inner peripheral surface of the multiple fitting of the female fitting is adapted to be fitted to the respective outer peripheral surface of the multiple fittings, and a sealing material is attached to each fitting portion, or
The male fitting and the female fitting are each formed of a concentric multiple pipe, each outer peripheral surface of the multiple pipe of the male fitting is fitted to each inner peripheral surface of the multiple pipe of the female fitting, and each fitting portion is provided. The present invention relates to a multiple pipe joint in which a sealing material is mounted on the pipe joint. In addition, it is preferable to attach a backup ring to at least both sides of the sealing material in one fitting portion of the multiple pipe.

Preferably, at least one of the male and female fittings is provided with a closing member urged by a spring so as to close the end of the multiple pipe, and the male and female fittings are connected. The present invention relates to a multi-pipe joint in which the multi-pipe end of the other fitting pushes the closing member to open the multi-pipe.

[0010] More preferably, a pressing member and a sleeve for preventing detachment of the pressing member are arranged on the outermost periphery of the female fitting, and when the pressing member is connected to the male fitting, the pressing member is formed on the outermost periphery of the male fitting. And the sleeve is moved to the male fitting side by the bias of the spring to prevent the pressing member from coming out of the concave portion.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In a pipe joint according to the present invention, a male fitting and a female fitting are each composed of multiple pipes. That is,
By newly providing an inner pipe to the conventional fitting,
It is a multiple tube consisting of an inner tube and an outer tube. Therefore,
A circuit can be formed not only inside the inner tube but also between the inner tube and the outer tube. If there is one inner tube, two circuits are provided. If the number of inner tubes is increased, the number of circuits can be increased accordingly. In addition, the inner pipe is supported while securing the flow path by partially providing a column between the inner pipe and the outer pipe,
When there are a plurality of inner pipes, a support may be provided partially between the inner pipes.

Further, in the pipe joint of the present invention, multiple pipes are arranged concentrically. Therefore, the multiple pipes of the male metal fitting and the female metal fitting are fitted to each other, so that they can be easily connected. Moreover, even if the fitting portion is used for rotating the pipes before and after the pipe joint, and there is play in the rotating direction at the fitting portion, it does not hinder the connection at all.

The fitting portion may be such that the inner peripheral surface of each of the multiple tubes of the male fitting is fitted to the outer peripheral surface of each of the multiple tubes of the female fitting. May be fitted to the respective inner peripheral surfaces of the multiple tubes of the female fitting. This difference is due to the
It is only the difference between whether the flow path is between the outer peripheral surface of the male fitting and the inner peripheral face of the female fitting, or conversely, whether the flow path is between the inner peripheral face of the male fitting and the outer circumferential face of the female fitting. Because there is no.

By attaching a sealing material to each fitting portion, leakage of fluid in the circuit is prevented, and independence between the plurality of circuits is maintained. In addition, the sealing material may be mounted on either side of the male metal fitting and the female metal fitting as long as it is a fitting portion, or may be mounted on both sides.

Here, in order to ensure the sealing property, a backup ring is mounted on the back surface of the sealing material. That is, the sealing material is arranged on the pressure acting side, and the backup ring is arranged on the back side. However, the pipe joint of the present invention is a multiple pipe, and has a plurality of circuits. Therefore,
The pressure in each circuit is different, and the high pressure side and the low pressure side may be reversed depending on the use condition. Therefore, it is preferable to attach backup rings to both sides of the seal member in advance, at least between circuits where the direction in which pressure acts on the seal member may be reversed.

Preferably, at least one of the male fitting and the female fitting is provided with a closing member at the end of the multiple pipe. This is because the closing member can prevent foreign matter from entering the circuit of the pipe joint at the time of detachment. If the end of the multiple pipe is urged by a spring so as to close it, it is closed at the time of detachment, but at the time of connection, the multiple pipe end of one metal fitting pushes the closing member, so that the male metal fitting The multi-pipe is opened only in a state in which the and the female fitting are connected.

Here, regarding the connection between the male fitting and the female fitting,
Means for preventing the detachment can be provided. That is,
A pressing member and a sleeve for preventing the pressing member from being detached are arranged at the outermost periphery of the female fitting, and when the pressing member is connected to the male fitting, the pressing member falls into a concave portion formed on the outermost periphery of the male fitting. If the sleeve is moved toward the male fitting by the bias of the spring so that the pressing member does not come out of the recess when the spring is depressed, the pressing member of the female fitting is caught in the recess of the male fitting and is prevented from being detached. Will be done.

On the other hand, when the male fitting and the female fitting are separated, if the sleeve is manually moved toward the female fitting against the bias of the spring, the pressing member can easily come out of the recess. The withdrawal operation is easily completed.

However, it is also possible to simply insert and fit both the male and female fittings without providing the detachment preventing means on the fitting itself. In this case, both ends of the metal fitting after the connection are restrained by some mechanical means to prevent detachment.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The multiple pipe joint of the present invention will be described below in more detail with reference to the drawings. FIG. 1 is a half sectional view showing a first embodiment of the multiple pipe joint of the present invention. The female fitting 1 has an end inner tube 2A,
An inner tube composed of an intermediate inner tube 2B and a connecting portion inner tube 2C;
It has an outer tube composed of an end outer tube 3A, an intermediate outer tube 3B, and a joint outer tube 3C. On the other hand, the male fitting 11 is the end inner tube 1
It has an inner tube composed of 2A and a joint inner tube 12C, and an outer tube composed of an end outer tube 13A, an intermediate outer tube 13B, and a joint outer tube 13C.

Here, in the female fitting 1, the end inner tube 2A
The middle inner tube 2B is screwed to the middle inner tube 2B with the seal member 4A interposed therebetween, and the end of the joint inner tube 2C is slidably inserted into the inner surface of the middle inner tube 2B with the seal member 4B held therebetween. The connecting portion inner tube 2C is urged by a spring 5A, and an insertion portion 6A is formed between the intermediate inner tube 2B and the connecting portion inner tube 2C. The insertion portion 6A is urged by the spring 5B. Closed member 7A is provided. Further, a closing member 7B provided with a sealing material 4C is provided inside the connecting portion inner tube 2C.

The outer tube of the female fitting 1 has substantially the same structure as that of the inner tube. That is, the end outer tube 3A
The middle outer tube 3B is screwed to the middle outer tube 3B with the seal member 4D interposed therebetween, and the end of the joint outer tube 3C is slidably inserted into the inner surface of the middle outer tube 3B with the seal member 4E held therebetween. The joint outer tube 3C is urged by a spring 5C so that an insertion portion 6B is formed between the intermediate outer tube 3B and the joint outer tube 3C, and is attached to the insertion portion 6B by a spring 5D. A biased closing member 7C is provided. The outer tube and the inner tube are supported concentrically.

Accordingly, the first circuit extends from the inside of the end inner tube 2A to the space between the connecting portion inner tube 2C and the closing member 7B, and the intermediate circuit 2 extends from between the end inner tube 2A and the end outer tube 3A.
The area between B and the joint outer tube 3C constitutes a second circuit. The first circuit is closed by the closing member 7B and the connecting portion inner tube 2C when the pipe joint is detached, and the second circuit is connected to the intermediate inner tube 2 having the sealing material 4F attached to the end.
B and the joint outer tube 3C.

On the other hand, in the male fitting 11,
A and the connecting portion inner tube 12C are screwed with the sealing material 14A interposed therebetween. A sealing member 14B is mounted inside the distal end of the inner tube 12C, and a closing member 17A urged by a spring 15A is inserted therein. The closing member 17A has an opening 18A.

The outer tube of the male fitting 11 is an end outer tube 13.
One end of A is inserted outside the intermediate outer tube 13B with the sealant 14C interposed therebetween, and the end outer tube 13A and the joint outer tube 13C are screwed. A sealing member 14D is mounted inside the distal end of the outer tube 13C, and a closing member 17B urged by a spring 15B is inserted therein. A seal member 14E is attached to the outer periphery of the intermediate outer tube 13B, and the opening 1
The sealing member 14F is provided on the inner periphery of the closing member 17B having the 8B.
Are mounted, and the outer tube and the inner tube are supported concentrically.

Accordingly, the first circuit extends from the inside of the end inner tube 12A to the opening 18A of the closing member 17A, and the closing circuit 17 extends from between the end inner tube 12A and the end outer tube 13A.
The second circuit extends to the opening 18B of B. In the first circuit, the opening 18A of the closing member 17A is closed by the connecting portion inner tube 12C when the pipe joint is detached, and in the second circuit, the opening 18B of the closing member 17B is closed by the connecting portion outer tube 13C. ing.

FIG. 2 is a half sectional view showing a state of connection of the multiple pipe joint of the first embodiment shown in FIG. That is, male fitting 1
The distal ends of the joint inner tube 12C and the joint outer tube 13C push the closing member 7A and the closing member 7C of the female fitting 1, respectively, and further push the joint inner tube 2C and the joint outer tube 3C. Then, the tip of the intermediate outer tube 3B of the female fitting 1 abuts against a stepped portion of the connecting part outer pipe 13C of the male fitting 11, and the inner peripheral surfaces of the connecting part inner pipe 12C and the connecting part outer pipe 13C of the male fitting 11 respectively. The fitting part inner pipe 2C and the fitting part outer pipe 3C of the female fitting 1 are fitted to the respective outer peripheral surfaces.

At the same time, the ends of the closing member 7B and the intermediate inner tube 2B of the female fitting 1 abut against the leading ends of the closing members 17A and 17B of the male fitting 11, respectively.
Of the closing members 17A and 17B.

Therefore, at the time of coupling, the inner tube 2C and the outer tube 3C of the female fitting 1 are pushed in, the circuit of the female fitting 1 is opened, and the closing members 17A and 17B of the male fitting 11 are pushed in. As a result, the circuit of the male fitting 11 is opened, so that the circuit 21 and the circuit 22 form a double circuit pipe joint. In addition, the multiple pipe joint of the first embodiment is used by being incorporated in an excavating machine or the like, and the connected state is maintained by restraining by the machine.

FIG. 3 is a half sectional view showing a second embodiment of the multiple pipe joint according to the present invention. In the second embodiment, a detachment preventing means is added to the multiple pipe joint of the first embodiment, and a pressing member 8 and a sleeve 9 for preventing the detachment of the pressing member 8 are arranged on the outer periphery of the intermediate outer tube 3B in the female fitting 1. It was done. On the other hand, a concave portion 19
Is formed. The other configurations of the female fitting 1 and the male fitting 11 are the same as in the first embodiment.

FIG. 4 is a half sectional view showing a state of connection of the multiple pipe joint of the second embodiment shown in FIG. That is, the female fitting 1
When the male member 11 is connected to the male member 11, the pressing member 8 falls into the concave portion 19, and the sleeve 9 is moved toward the male metal member 11 by the bias of the spring 5 </ b> E of the female metal member 1.
9 does not escape.

On the other hand, when the female fitting 1 and the male fitting 11 are separated from each other, the sleeve 9 is connected to the female fitting 1 against the bias of the spring 5E.
If the pressing member 8 is manually moved to the side, the pressing member 8 can easily come out of the concave portion 19, so that the detaching operation is easily completed and returns to the separated state in FIG.

FIG. 5 is a half sectional view showing a third embodiment of the multiple pipe joint according to the present invention. In the third embodiment, backup rings 10A and 10B are attached to both sides of the inner tube sealing members 4A, 4B and 4G of the female fitting 1, respectively, and the inner pipe sealing members 14A, 14B and 14G of the male fitting 11 are provided.
Backup rings 20A and 20B on both sides of
Is attached.

FIG. 6 is a half sectional view showing the state of connection of the multiple pipe joint of the third embodiment shown in FIG. That is, the female fitting 1
The first circuit 21 and the second circuit 2
2 is configured, but the pressure of the first circuit 21 is
Backup rings 10A and 20
A works effectively, and conversely, when the pressure of the second circuit 22 is higher than that of the first circuit 21, the backup rings 10B and 20B work effectively. Therefore, the sealing property between the circuits is ensured.

In the third embodiment, the outer ring seals 4D, 4E, 14C, 14D have only one backup ring. This is because the outside of the pipe joint is at atmospheric pressure, and the pressure on the second circuit 22 side is high in normal use. However, there is a possibility that a negative pressure may act on the second circuit 22 depending on use conditions. , A backup ring on both sides may be used.

[0036]

In the multiple pipe joint according to the present invention, the male fitting and the female fitting are each formed of a concentric multiple pipe, and each of the multiple pipes of the male fitting is fitted to each of the multiple pipes of the female fitting. Therefore, even when a plurality of circuits are used for coupling and decoupling at the same time, a pipe joint excellent in workability can be provided without requiring an installation space. Further, even when the pipe is used for rotating pipes before and after the pipe joint, the connection and detachment work can be performed easily and reliably.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a first embodiment of a multiple pipe joint according to the present invention.

FIG. 2 is a half cross-sectional view showing a connected state of the multiple pipe joint of the first embodiment.

FIG. 3 is a half sectional view showing a second embodiment of the multiple pipe joint of the present invention.

FIG. 4 is a half cross-sectional view showing a connected state of the multiple pipe joint of the second embodiment.

FIG. 5 is a half sectional view showing a third embodiment of the multiple pipe joint of the present invention.

FIG. 6 is a half cross-sectional view showing a connected state of the multiple pipe joint of the third embodiment.

[Explanation of symbols]

1 ‥‥ Female fitting 2A ‥‥ End fitting inner pipe of female fitting 2B ‥‥ Middle fitting inner pipe of female fitting 2C ‥‥ Inner fitting fitting of female fitting 3A ‥‥ End fitting outer pipe of female fitting 3B ‥‥ Middle fitting of female fitting Pipe 3C {Joint part of female fitting outer tube 4A, 4B, 4C, 4D, 4E} Female fitting sealing material 5A, 5B, 5C, 5D {Female fitting spring 6A, 6B} Insertion part 7A, 7B , 7C {closer member of female fitting 8} pressing member 9} sleeve 10A, 10B {backup ring 11} male fitting 12A {end inner pipe of male fitting 12C {joining inner pipe of male fitting 13A} {End outer tube of male fitting 13B} Middle outer pipe of male fitting 13C {Joint fitting outer pipe of male fitting 14A, 14B, 14C, 14D, 14E, 14F}
Sealing material for male fittings 15A, 15B {Spring of male fittings 17A, 17B} Closing member for male fittings 18A, 18B {Opening 19} Recess 20A, 20B {Backup ring 21} First circuit 22} 2nd circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaru Adachi 3-36-2 Higashi-Ueno, Taito-ku, Tokyo (72) Inventor Kazuo Yamazaki 1293, Adocho, Hanamigawa-ku, Chiba-shi, Chiba Chiba Works (72) Inventor Mitsuru Kawahara 3-6-2 Nihonbashi Honcho, Chuo-ku, Tokyo Bridgestone Flowtech Co., Ltd. (72) Inventor Akihiko Nagase 3-6-1-2 Nihonbashi Honcho, Chuo-ku, Tokyo Bridgestone Flowtech Co., Ltd. F term (reference) 2D054 AC18 AD28 3J106 AB03 BA01 BB01 BC04 BD01 BE12 BE29 BE31 CA08 EA03 EB07 EC02 EC07 ED32 EE13 GA02 GA04 GA11 GA22 GA23 GB01 GB02

Claims (5)

[Claims] The male fitting and the female fitting are each formed of a concentric multiple pipe, and the inner peripheral surface of each of the multiple pipes of the male fitting is fitted to the outer peripheral surface of each of the multiple pipes of the female fitting, and A multiple pipe joint characterized in that a sealing material is mounted on each fitting portion. 2. The male fitting and the female fitting are each formed of a concentric multiple pipe, and the outer peripheral surface of each of the multiple pipes of the male fitting is fitted to the inner peripheral surface of each of the multiple pipes of the female fitting, and A multiple pipe joint characterized in that a sealing material is mounted on each fitting portion. 3. The multiple pipe joint according to claim 1, wherein backup rings are mounted on at least both sides of the seal member at one fitting portion of the multiple pipe. 4. A closing member urged by a spring so as to close an end of the multiple tube at least on one of the male fitting and the female fitting, and the other is provided only when the male fitting and the female fitting are connected. The multi-pipe joint according to claim 1, wherein the multi-pipe end of the fitting pushes the closing member to open the multi-pipe. 5. A pressing member and a sleeve for preventing detachment of the pressing member are arranged on the outermost periphery of the female fitting, and when the pressing member is connected to the male fitting, the pressing member falls into a concave portion formed on the outermost periphery of the male fitting, and 5. The multiple pipe joint according to claim 1, wherein the sleeve is moved toward the male fitting by the bias of the spring so that the pressing member does not come out of the concave portion.