JPH11325354A - Pipe connecting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple pipe connecting structure, which can surely connect pipes mechanically and fluidly in a relatively small space with good position decision accuracy, and in which seal material thereof has wide selectivity and seal mechanism thereof is not susceptible to be harmed. SOLUTION: This pipe connecting structure comprises: pipe bodies 1, 1' butt-jointed at ends respectively in such a manner that receiving openings 4, 4' having a large diameter, are contiguous from pipe lines 2, 2' and jointed to the ends of the pipe bodies 1, 1', respectively; and cylindrical couplings 5 provided with seal mechanisms 11, which are inserted into the receiving openings 4, 4' of pipe bodies 1, 1' neighboring to each other, and brought into contact with backs of the receiving openings 4, 4' at end faces thereof. Accordingly, pipes can be surely connected mechanically and fluidly in small space with good positioning accuracy and with simple structure, and seal mechanisms 11 are not affected by sharing force so that the seal mechanisms 11 are not susceptible to be harmed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connecting structure capable of connecting pipes in a relatively small space with high positioning accuracy.

[0002]

2. Description of the Related Art In a pipe for a fluid such as pressurized oil, compressed air, water, etc., a connection between two spaced apart points as a flow path is usually made by one of the following three methods. A method using a bite type pipe joint, b method using a flange joint, c method using a manifold connection.

[0003] The above a and b are suitable for fluid connection between two relatively distant points, but a is a Japanese Industrial Standard (JI).
S) A union for inserting a sleeve between the tapered inside of the tip of the joint body and the outer circumference of the tip of the pipe to be connected, as defined in B 2351, and screwing the sleeve to the joint tip The tube is inserted into the tube by the tightening force of the nut.

[0004] Further, b denotes a flange which is welded to a pipe end and is closely attached to a member having a pipe to be connected via a seal so that the pipe and the pipe are connected to each other. Further, c is suitable for mechanically and fluidly connecting fluid control devices such as solenoid valves, and connecting a plurality of pipelines provided in the device by surface-joining the fluid control devices. It is.

However, since the joint body, the union nut, the flange, and the like are interposed between the pipes and the members having the pipes, a and b are mechanical and fluid in a relatively small space of, for example, about 50 mm. It is very difficult to connect reliably and with high positioning accuracy.
In addition, connecting a plurality of pipelines in close proximity to each other
More difficult. Further, in the above-mentioned c, even if the connection with high mechanical and fluid connection reliability and high positioning accuracy is possible by, for example, the combination of the dowel hole and the pin, processing for the above-mentioned combination and formation of a pipeline inside are performed. For example, the structure becomes complicated, and a compact configuration cannot be expected.

However, like the connection structure of a buried pipe for a propulsion method disclosed in Japanese Utility Model Application Laid-Open No. 4-17588, each of adjacent buried pipes except for the pipe main body portion has an abutting end. A receiving portion whose inner diameter is larger than the inner diameter of each pipe main body portion so that a step portion is formed at each inner deep end, and a buried pipe having each receiving portion. It has a compressive strength per unit area larger than the compressive strength per unit area, and has a cylindrical joint in which each end is inserted into each receptacle, and is fitted to the outer peripheral surface of the joint so that each There is also a connecting portion structure including a packing for sealing between the inner peripheral surfaces of the receiving portions. According to such a structure, the receiving portion is formed in the pipe main body, and the cylindrical joint is inserted. ,
Although the packing is compact and the positioning accuracy is improved, the following problems arise because the packing is set so as to seal between the outer peripheral surface of the cylindrical joint and the inner peripheral surface of the socket.

That is, when inserting a joint in which the packing is set on the outer circumference into the pipe body, it is necessary to elastically deform the packing and push it in. Therefore, the material of the packing is limited to an elastic material such as rubber. From the point of view, this structure cannot be adopted for a pipeline that handles high-temperature and high-pressure fluid. Further, as described above, when the packing is elastically deformed while being pushed in while being pressed or a temperature change after assembling, a shear force acts on the packing. It is necessary to perform chamfering from the outer peripheral surface of the end portion toward the inner diameter in the tapered shape at the end of the portion so that the packing is not damaged. Must have a large diameter.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional pipe connection structure, and provides reliable mechanical and fluid connection in a relatively small space with high positioning accuracy. It is an object of the present invention to provide a pipe connecting structure having a simple structure that can be used, has a wide selection of sealing materials, and does not cause damage to the sealing mechanism.

[0009]

According to the present invention, there is provided a connecting structure for a pipe according to the present invention, wherein a receiving portion having a diameter larger than that of a pipe is formed at an end thereof so as to be continuous with the pipe. And a cylindrical joint having a seal mechanism provided on the end face and in contact with the back of the receiving portion, which is inserted over the receiving portion of the adjacent pipe. The first invention is characterized in that a plurality of conduits are formed at the same position on a cross section of a tubular body to be connected, and a receiving portion having a larger diameter than the conduit is provided at an end of the tubular body. A pipe body formed continuously with the road and having a butt-connecting end portion, and a seal mechanism that is inserted over each of the receiving ports of the adjacent pipes and that is in contact with the back of the receiving port on the end face. And a plurality of cylindrical joints.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to FIGS. FIGS. 1 and 2 show a first embodiment of the present invention. Reference numerals 1 and 1 'denote pipes in which ends are connected to each other. Pipes 2 and 2' are formed therein. In the example shown in the figure, flanges 3 and 3 'are provided at the ends, and pipes 1 and 1' are connected to the ends of the flanges 3 and 3 'on the side of the pipes 2 and 2'. The receiving portions 4, 4 'having a larger diameter than the paths 2, 2' are formed. The receptacle 4,
The depth of 4 'should be selected to be slightly larger than the length of the joints 5, 6 described below when two adjacent pipes 1, 1' are abutted.

Reference numerals 5 and 6 denote cylindrical joints, in which pipes 7 and 8 having the same diameter as the pipes 2 and 2 'are formed, respectively.
On both end surfaces, the joint 5 shown in FIG. 1 is continuous with the pipe 7, and the joint 6 shown in FIG.
Ring-shaped grooves 9 and 10 are formed respectively, and O
Rings 11 and 12 are fitted. When the O-rings 11 and 12 are fitted, the depth of the grooves 9 and 10
1, 12 are slightly protruded. 5a, 6
“a” is a relief groove formed on the outer periphery of the center of the joints 5, 6 for avoiding the influence of burrs or the like generated on the receiving portions 4, 4 ′, and may be omitted depending on the degree of processing.

When connecting the pipes 1 and 1 ', joints 5 and 6 in which O-rings 11 and 12 are fitted in ring-shaped grooves 9 and 10 are prepared, and these are connected to the pipes 1 and 1'. Port 4,
Insert at 4 '. Bolt holes 3a in the flange portions 3, 3 ',
Insert the bolt 13 into 3'a, washer 14, nut 1
5, the pipes 1, 1 'are connected while being accurately positioned by the joints 5, 6, and at this time, the joints 5, 1
The O-rings 11 and 12 of 6 are the back walls 4a of the receptacles 4 and 4 ',
It is pressed against 4'a to seal this part. In this way, the lines 2, 2 'are connected at relatively small intervals via the lines 7, 8 of the joints 5, 6.

FIG. 3 shows a second embodiment of the present invention. Reference numerals 21 and 22 denote pipes having a plurality of conduits 23 and 24, respectively, like those shown in FIGS. Although the parts are connected by abutting each other, in FIG. 3, one pipe 21 has a pipe 23 which directly communicates with the control device and the like. Although the pipes 23 are illustrated in FIG. 3 as being arranged in parallel in one cross section, their arrangement is arbitrary, and may be formed, for example, according to the arrangement of the pipes inside the control device. . The pipe 24 of the other pipe 22 is formed at the same position as the cross-sectional arrangement of the pipe 23 in the one pipe 21. A flange 25 is formed at an end of the tube 22.

At opposite ends of the pipes 21 and 22 in the pipes 23 and 24, receiving ports 26 and 27 having a larger diameter than the pipes 23 and 24 are connected to the pipes 23 and 24, respectively. Is formed. The depths of the receiving portions 26 and 27 are shown in FIGS.
Similarly, when the pipes 21 and 22 to be connected to each other abut against each other, they are selected to be slightly larger than the length of the joint 28 described later.

Reference numeral 28 denotes a cylindrical joint, in which the pipe 2 is provided.
A pipe 29 having the same diameter as that of the pipes 3 and 24 is formed.
And an O-ring 31 is fitted in the groove 30. The depth of the groove 30 is such that the O-ring 31 slightly projects when the O-ring 31 is fitted. Reference numeral 28a denotes an escape groove for burrs and the like as described above.

When connecting the pipes 21 and 22, a joint 28 in which an O-ring 31 is fitted in a ring-shaped groove 30 is prepared, and this is connected to the receiving portions 26 and 27 of the two pipes 21 and 22. insert. Bolt 3 in bolt hole 25a of flange 25
2 is inserted and its tip is screwed and screwed into the screw hole 21a of the tube 21, and the tubes 21 and 22 are connected while being accurately positioned by the joint 28. At this time, the O-ring 31 of the joint 28 Inner walls 26a, 27a of receiving portions 26, 27
To seal this part. In this way, the lines 23, 24 are connected at relatively small intervals via the line 29 of the joint 28.

FIGS. 1 and 2 show a tube 1,
1 'is connected by flanges 3 and 3', but the flange 13 'is not provided on the tube 1', and the bolt 13 is directly screwed to the end face of the tube 1 'as in FIG. It can also be configured, in which case the two tubes 1, 1 'can be connected at even smaller intervals. The O-ring 1
Since 1, 12, and 31 receive only a compressive force, soft metals such as copper and aluminum can be used instead of rubber and synthetic resin.

[0018]

According to the pipe connection structure of the present invention, a pipe having a receiving portion having a diameter larger than that of a pipe at an end thereof is formed so as to be continuous with the pipe, and the ends are butt-connected. And a cylindrical joint having a seal mechanism provided at an end surface thereof and in contact with the inside of the receiving portion, which is inserted across the receiving portion of the adjacent pipe body, according to the first invention, It can be connected mechanically and fluidly in a relatively small space reliably and with high positioning accuracy, can select a wide range of sealing materials, and damages the sealing mechanism because no shearing force is applied. In addition, there is an effect that it is possible to provide a connection structure of a pipe having a simple structure.

A plurality of conduits are formed at the same position on the cross section of the pipe to be connected, and a receiving portion having a diameter larger than that of the conduit is connected to an end of the pipe. Formed
From a tubular body in which the ends are butt-connected, and a plurality of cylindrical joints provided with a sealing mechanism that is inserted over each of the receiving ports of the adjacent pipes and that is in contact with the back of the receiving port on the end face According to the second aspect of the present invention, in addition to the effects of the first aspect, there is also an effect that a pipe having a plurality of pipes can be connected together in a compact manner.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of a pipe connection structure of the present invention.

FIG. 2 is a cross-sectional view of another embodiment of the pipe connection structure of the present invention.

FIG. 3 is a cross-sectional view of still another embodiment of the pipe connection structure of the present invention.

[Explanation of symbols]

1, 1 ', 21, 22 Tube 2, 2', 23, 24
Pipe line (of pipe body) 3, 3 ', 25 Flange part 4, 4', 26, 27
Receiving part 5, 6, 28 Joint 7, 8, 29 Pipeline 9, 10, 30 (of joint) Groove 11, 12, 3 of (O-ring)
1 O-ring 13, 32 bolt 14 washer 15 nut.

Claims (2)

[Claims] 1. A pipe body having a larger diameter than a pipe at its end and formed continuously with said pipe, wherein the ends are butt-connected, and a port of an adjacent pipe is formed. And a cylindrical joint provided with a seal mechanism in contact with the end of the receptacle at the end face. 2. A plurality of pipes are formed at the same position on a cross section of a pipe to be connected, and a receiving portion having a larger diameter than the pipe is connected to an end of the pipe. And a plurality of cylinders provided with a sealing mechanism which is inserted over each of the receiving portions of the adjacent pipes and has a sealing mechanism which is in contact with the inside of the receiving portion at the end face. A pipe connection structure, comprising a pipe-shaped joint.