JPH03219193A - Joint for connecting metal pipes - Google Patents

Abstract

PURPOSE:To ensure the easy coupling of piping and prevent the occurrence of a coupling defect by providing a seal member within a joint body, forming the forward end with an engagement groove of triangular section in such a way as to a circular arc projected wall, grouping the projected walls for fastening and pressing the bulge wall part of piping into the engagement groove. CONSTITUTION:A seal member 4 is provided on the internal seat part 3 of a joint body 1 having a through-hole 2 at the axial center thereof. Also, the seat part 3 is provided with a plurality of circular arc projected walls 1' having relatively thin wall tips and sloped engagement grooves 5 of triangular section for coupling to the rear surface of the annular bulge wall P' of piping P. The projected walls 1' are free to open and close approximately over the half surface thereof. Furthermore. the portions of the projected walls 1' are grouped and fastened, with the piping P kept in a connected condition, thereby pressing the bulge wall part P' into the engagement grooves 5. According to the aforesaid construction, stress does not occur at the time of connecting the piping P, and a crack or fracture due to fatigue or the like can be prevented. Also, a pressing force can be made approximately uniform.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is directed to a pipe with a diameter of 20 m/ln, which is used as a supply route for oil and air supply to various types of machinery, devices, etc.
This article relates to a joint for connecting metal piping with a relatively small diameter of less than 100 yen.

(Prior art) Conventionally, as shown in Fig. S, for example, as shown in Fig. With the double flare (P,') as a bulging wall provided at the connecting end of the pipe in contact with the fitting body (11), the fitting (14) built into the piping side is screwed into the fitting body (11). Double flare (P1')
the seat surface (13) and the seat surface (15) of the nut (14).
It was configured to be connected by pressing between them.

(Problem to be solved by the invention) However, in such a conventional technique, since the pipe (Pl) penetrates the axis of the nut (14), the pipe becomes an obstacle and the nut (14) ), it is only possible to use a ratchet wrench or an automatic screw-on machine from the front side in the axial direction, and it takes a lot of man-hours to tighten the nut by repeatedly attaching and detaching it from the side of the nut using hand tools such as spanners and adjustable wrenches. Tightening takes a considerable amount of time and is not only troublesome, but also causes the force to be uniform, which may result in poor assembly, or on the other hand, excessive tightening may cause double flare ( P
This resulted in soaking or deformation at the piping (Pl), making it impossible to connect and use the piping (Pl) again after removal.Also, when connecting the piping (Pl), the nut ( 14) Due to the tightening of the double flare (P1') in the rotating direction, stress in the torsional direction and thinning of the double flare due to pinch pressure occur in a part of the double flare, and under the vibration condition, fatigue occurs in the lower part of the neck. There were also problems such as a tendency to cause cracks, breakage, and leakage due to such problems.

The present invention has been made in view of the above-mentioned problems of the prior art, and can be easily assembled, eliminating stress due to torsion in the bulging wall portion, and preventing cracks due to fatigue etc. in the lower part of the neck.
This prevents breakage and at the same time prevents assembly failures during connection, making the holding force approximately equal, and preventing soaking and deformation at the bulging wall, allowing the pipe to be connected and used again without any problems. The purpose of this paper is to propose two methods for connecting metal piping.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a sealing member on the internal seat portion that forms the connection abutment portion with the piping of the joint body, which has a flow hole penetrating through the shaft core. At the same time, a relatively thin end portion is provided with an engagement groove having a triangular cross section formed by an inclined surface that retains pressure on the back surface of the outward annular bulging wall portion provided on the connection side of the piping along with the seat surface portion. A plurality of arcuate protruding walls are formed, the protruding walls are able to be opened and closed over at least approximately half the circumference thereof, and the protruding wall portions are fixed in a bundle when in a connected state. A joint for connecting metal pipes configured so that the bulging wall portion is pressed into contact with the inside of the engagement groove, and a connection abutment portion with the pipe of the joint body having a circulation hole provided with a sealing member in the shaft core. an internal seat portion forming a shape, and an annular bulging wall portion extending outwards, which is connected to the seat portion and provided on the connection side of the piping, and has an inclined surface having a triangular cross section and a pressure-releasing surface on the back side of the outward annular bulging wall portion. Formed with a plurality of circular arc-shaped projecting walls with relatively thin walls at the tip end. l-1-The protruding wall is made to be freely openable and closable over at least approximately half its circumference, and by fixing the protruding wall portions together in a connected state, the protruding wall portion is inserted into the engagement groove. The gist is a joint for connecting metal pipes, which is configured by press-welding the sealing member to the outer layer of the tip extending from the bulging wall,
Further, the fixing means may be a ring member, a pan/do member, a carrier, etc.
- The lp part member is constructed by caulking with a claw wall provided directly on each protruding wall part, and a tapered washer is provided on the back surface of the bulging wall part of the pipe.

(Function) Since the present invention is configured as described above, when connecting a pipe, the protruding wall part on the connection side of the pipe is engaged while the protruding wall part provided on the joint body is opened over at least approximately half the circumference. By inserting the protruding wall into the engaging groove and then closing the protruding wall and fixing it as a bundle, the protruding wall can be easily pressed in the axial direction within the engaging groove, making it easy to assemble. Attachment is extremely easy, and it can be connected without stress due to twisting at the bulging wall. Therefore, even under severe stress and deformation, the lower part of the neck can effectively prevent cracks and breakage due to fatigue. In addition, it prevents defects during assembly, makes the holding force on the bulging wall even, and allows reconnection and use without worrying about crushing or deformation at the bulging wall. This can be done without any problems.

(Example) Hereinafter, embodiments of the present invention will be described based on the drawings. Fig. 1 is a plan view showing the metal pipe connection joint of the present invention in a connected state, and Fig. 2 is Fig. 1A- A partially cutaway sectional view taken along line A, FIGS. 3 and 4 are partially cutaway longitudinal sectional views showing respective embodiments of the fixing means, and FIG. 5 further shows an embodiment of a pond as the fixing means. The enlarged front view of the protruding wall, and FIGS. 6 and 7 are partially enlarged sectional views of the embodiment of the pond. An annular elastic sealing member (4) is provided on an internal seat surface (3) which extends through the pipe and forms a connection abutting part with the pipe (P). Then, the piping (P) is connected to the seat part (3).
A 1-system joint with a triangular cross-section (5) with an inclined surface that exerts 1-system pressure on the back of the outward annular bulging wall (Po) provided on the connection side of the
The distal end thereof is formed with a plurality of relatively thin circular arc-shaped protruding walls (1'), and these protruding walls (1') are pinned or hinged over at least approximately half the circumference. (6), etc., so that it can be opened and closed in the direction of the arrow, and when the pipe fP) is connected, the protruding wall part is bundled and the band member (Figs. 1 and 2) is extended outward. Fix it by press-fitting it, or fix it by covering it with a ring member made of spring material (Fig. 3), or fix it with a cap member (Fig. 4).
(7) etc. and fix it, the bulging wall (Po
) portion is pressed into contact with the inside of the engagement groove (5) in the axial direction.

Note that (8) in Fig. 5 is a protruding wall (8) as a means of fixing the pond.
This is a claw wall provided directly on the outer peripheral end of the 1°) portion, and is fixed by caulking to an adjacent protruding wall.

Furthermore, in Fig. 6, (9) is a washer with a taper, which ensures more secure pressing of the annular bulging warp (Po) against the seat surface part (3) during connection, and also as shown in Fig. 7. If the tip (Pa) is made to protrude from the protrusion 'l (P') and the seal member (4) is provided on the side of the flow hole (2) so as to come into pressure contact with the outer periphery of the tip, the seat part (3) and the seal part This increases the durability of the seal member (4) and facilitates positioning.

Incidentally, the joint body (1) and the protruding wall (1') may be formed separately and fixed by welding or the like.

(Effects of the Invention) As explained above, the metal pipe connection joint according to the present invention is particularly capable of freely opening and closing over at least approximately half of the plurality of protruding walls (1°) provided on the joint body (1). None, a bulging wall (Po
) is configured to be compressed inside the engagement groove (5), so there is no stress due to torsion in the bulging wall (Po) during connection, and therefore, even under vibration conditions, fatigue at the lower part of the neck is reduced. It is possible to effectively prevent cracks and breakage caused by such factors, and at the same time, it is possible to make the holding force approximately equal, so there is no fear of collapse or deformation of the bulging wall (Po), and the piping (P) is This is an extremely useful joint for connecting metal pipes, as it can be reconnected and used without any problems after being removed.

[Brief explanation of drawings]

Fig. 1 is a plan view of a joint for connecting metal pipes in a connected state showing one embodiment of the present invention, Fig. 2 is a partially cutaway sectional view taken along line AA in Fig. 1, and Figs. 3 and 4 are FIG. 5 is a partially cutaway longitudinal sectional view showing each embodiment of the fixing means, FIG. 5 is an enlarged front view of a protruding wall showing another embodiment of the fixing means, and FIGS. 6 and 7 are further FIG. 8 is a partially enlarged cross-sectional view of another embodiment, and a partially cutaway longitudinal cross-sectional view showing a connected state of a conventional connecting joint. (1)...Joint body, (1゛)...Protruding wall, (2)
... Distribution hole, (3) ... Seating surface part, (4) ... Seal member, (5) ... Engagement groove, (9) ... Washer, (P) ... Piping, (Po)...Bulging wall.

Claims (4)

[Claims] (1) Joint body (1) with a circulation hole (2) penetrated through the shaft core
Internal seat part (3) that forms the connection abutment part with the pipe (P) of
is provided with a sealing member (4), and an outward annular bulging wall (
Formed with a plurality of relatively thin arc-shaped protruding walls (1') at the tip end provided with an engagement groove (5) having a triangular cross-section formed by an inclined surface that is pressed against the back surface of the P') part. The protruding wall (1'') can be freely opened and closed over at least approximately half its circumference, and the protruding wall (1') is fixed as a bundle in the connected state. A joint for connecting metal pipes, characterized in that the part ') is configured to be pressed into contact with the inside of the engagement groove (5). (2) Communication hole (2) with a seal member (4) in the shaft core
An internal seat part (3) is provided which forms a connection abutment part with the pipe (P) of the joint body (1), which is provided through the joint body (1), and is connected to the seat part and provided on the connection side of the pipe (P). A plurality of circular arc-shaped projecting walls having a relatively thin tip end provided with an engagement groove (5) having a triangular cross section by an inclined surface that engages the back surface of the outward annular bulging wall (P'). (1'),
The protruding wall (1') can be freely opened and closed over at least approximately half its circumference, and the protruding wall (1') is fixed in a bundle in the connected state to form the protruding wall (P'). is pressed into contact with the inside of the engagement groove (5), and the bulging wall (P')
The seal member (4) is attached to the outer periphery of the tip (Pa) that extends further.
A joint for connecting metal piping, characterized in that it is constructed by pressure welding. (3) In claim 1 or 2, the fixing means is constituted by caulking with a claw wall (8) provided directly on a ring member, a band member, a cap member, or the protruding wall (1') of each. Features a fitting for connecting metal piping. (4) In claim 1 or 2, a tapered washer (9) is provided on the back surface of the bulging wall (P') of the pipe (P).
A fitting for connecting metal piping, characterized by being provided with.