JPH03219192A - Joint for connecting metal pipes - Google Patents

Abstract

PURPOSE:To enable the use of an automatic threading machine by providing a seal member within a joint body, forming projected walls comprising a pair of walls having opposite engagement grooves of triangular section, fixing the projected walls to each other and pressing the bulge wall portion of a pipe into the engagement grooves. 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 pair of projected walls 1' and 1' having opposite sloped engagement grooves 5 of triangular section for pressing the rear surface of the annular bulge wall P' of piping P. One of the projected walls 1' and 1' is free to open and close. Furthermore, the projected walls 1' and 1' are fixed to each other in the condition wherein the piping P is connected, thereby pressing the portion of the bulge wall P' into the engagement grooves 5. As a result, an automatic threading machine such as an air driver can be used and a crack or fracture can be prevented. Also, defective coupling can be prevented in jointing the piping P.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention generally relates to pipes with a diameter of about 20 m/m or less, which are installed as supply paths for oil and air in automobiles, various machines, devices, etc. This invention relates to a joint for connecting small-diameter metal pipes.

(Prior Art) Conventionally, as shown in FIG. 7, for example, as shown in FIG. With the double flare (Plo) part as a bulging wall provided at the connection end in contact with each other, the double flare (Plo )
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 conventional technology, since the pipe (Pl) passes through the axis of the nut (14), the pipe becomes an obstacle and prevents the nut (14) from being opened. When tightening a nut, it is not possible to use a ratchet wrench or an automatic screwing machine from the front side in the axial direction, and it takes a lot of man-hours and time to tighten it from the side of the nut by repeatedly attaching and detaching it using manual tools such as spanners and adjustable wrenches. Tightening with a large amount of force not only causes trouble, but also causes problems when tightening is done evenly, resulting in poor assembly.
On the other hand, excessive tightening causes double flare (ho
), resulting in soaking and deformation at the pipe (P:), making it impossible to reconnect the pipe (P:) after removal. In addition, when the piping (P-) is connected (at this point), the nut (14) is directly tightened in the rotating direction to the double flare (Plo) surface, resulting in a thin wall due to stress in the torsional direction and clamping pressure on the double flare part. The problem is that the lower part of the neck tends to crack, break, or leak due to fatigue when subjected to vibration.

The present invention has been made in view of the above-mentioned problems of the prior art, and enables the use of an automatic screw-fastening machine such as an air driver, and eliminates the stress caused by twisting in the bulging wall, thereby preventing cracks in the lower part of the neck. At the same time, it prevents breakage, and at the same time prevents assembly defects during connection, making the holding force approximately equal, and also prevents crushing and deformation at the bulging wall, so that the pipe can be connected and used again without any problems. The purpose of this paper is to propose a joint for connecting metal pipes that can be used to connect metal pipes.

(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. and a pair of opposing engaging grooves each having a triangular cross section and having an inclined surface that engages with the back surface of an outward annular bulging wall provided on the connection side of the piping and carried to the seat surface. It is formed with a protruding wall, at least one of the protruding walls can be opened and closed, and when the protruding wall parts are fixed to each other in a connected state, the protruding wall part is pressed into contact with the inside of the engagement groove. A joint for connecting metal pipes configured as shown in FIG. The projecting wall includes a pair of opposing engaging grooves having a triangular cross section and having an inclined surface that applies pressure to the rear surface of the outward annular bulging wall provided on the connection side of the pipe. At least one of the protruding walls is formed to be openable and closable, and by fixing the protruding walls to each other in a connected state, the bulging wall part is pressed into contact with the inside of the engagement groove, and the bulging wall part is pressed into contact with the inside of the engagement groove. The gist of this joint is a metal pipe connection joint constructed by press-fitting a sealing member to the outer periphery of the tip extending from the wall, and further includes a tapered washer on the back surface of the bulging wall portion of the self-pipe. There are many configurations. .

(Function) Since the present invention is configured as described above, when connecting a pipe, at least one protruding wall provided on the joint body is opened, and the protruding wall on the connection side of the pipe is connected to the engagement groove. 1. By inserting the protruding wall into the engagement groove and then fixing the protruding wall to each other, the protruding wall can be easily press-contacted in the axial direction within the engagement groove. When fixing parts to each other by screwing, there is no obstacle to the screw axis, and it is possible to use a ratchet wrench or an automatic screw setting machine, which can be installed and removed once from the axis direction, greatly simplifying assembly. Furthermore, it can be connected without stress due to torsion at the bulging wall, and therefore cracks and breakage at the lower part of the neck can be effectively reduced even under vibration conditions, and incorrect assembly can be avoided. This makes it possible to make the retaining force on the bulging wall approximately uniform, and also allows the bulging wall to be connected again for single use without any problems, without worrying about soaking or deformation.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. FIG. 1 is a top view of the metal pipe connection joint of the present invention in a connected state, and FIG. 2 is a top view of the joint for connecting metal pipes of the present invention. A partially cutaway sectional view of line A,
Figures 3 and 11 are views equivalent to Figure 2 showing an example of the pond, Figure 5 is a partially enlarged view of the example of the pond, and Figure 6 (a) is yet another example. A diagram equivalent to Figure 2, Figure 6 (b)
is a front view of FIG. 6(a), in which (1) is the main body of the joint, which has a circulation hole (2) through the shaft core, and a pipe (P).
An annular elastic seal member (4) is provided on an internal seat surface (3) that forms a connection abutment part with the seat. Then, an engagement groove (5) having a triangular cross-section and an inclined surface that maintains pressure is formed on the back surface of the outward annular bulging wall (Po) provided on the connection side of the pipe (P) following the seat surface (3). ) are provided facing each other, the inner circumferential surfaces thereof are formed with substantially semi-conical protruding walls (1', 1'''), and these protruding walls (1', 1'')
At least one of the piping (P
), and by fixing the protruding wall parts to each other in the radial direction of the pipe (P) with hexagonal holes H (7), cross holes I~, etc., the protruding wall (Po) can be connected. Matching groove (5)
The connection is made by pressure contacting the inside in the axial direction. As shown in Figure 3, the tip (Pa) of the pipe [P] is connected to the flow hole (2).
) to facilitate positioning.

Further, in FIG. 4, (8) is a tapered washer (-), which ensures more secure pressing of the annular bulge (Po) against the seat surface (3) during connection.

Furthermore, as shown in FIG. 3, if the seal member (4) is installed on the side of the flow hole (2) and configured to press against the outer periphery of the tip (Pa), the seat surface portion (3) and the seal portion are separated, and the seal member (
4) Durability can be increased.

Further, the bolt (7) can also be fixed to the pipe (P) in the axial direction as shown in FIGS. 6(a) and 6(b).

(Effects of the Invention) As explained above, the metal pipe connection joint according to the present invention is particularly characterized in that at least one of the pair of protruding walls (1', 1'') provided on the joint main body (1) can be opened and closed. None, the 7th assembly which made it possible to use an automatic screw-fitting machine, etc., has been significantly revised and abolished, and the bulging wall (Po) part is attached due to the engagement pressure in the axial direction from the back side. (5) In order to make a 1M pressure contact inside, one protruding wall (Po
), there is no stress due to torsion, and it is possible to effectively prevent cracks and breakage due to fatigue in the lower part of the neck under bad vibration conditions. 1. To prevent this and make the interlocking force approximately equal.1. This is an extremely useful joint for connecting metal pipes, as there is no need to worry about soaking or deformation of the bulging wall (Po), and the pipe (P) can be reconnected and used without any problems after being removed. be.

[Brief explanation of drawings]

Fig. 1 is a top view of a metal pipe connection joint in a connected state showing an 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 partial enlarged sectional view of an embodiment of a pond, FIG. 6 is a diagram equivalent to FIG. 2 of another embodiment, and FIG. FIG. 6(b) is a front view of FIG. 6(a), and FIG. 7 is a partially cutaway N cross-sectional view showing the conventional connection joint in the connected state. (1) (Hand body, [1', 1”)...Protruding wall, (
2)...Flow hole, (3)...Seating surface part, (11)...
・Sealing member, (5) 1 system joint lecture, (P)... Piping, (
P")...Bulging wall.

Claims (3)

[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 (
A protruding wall (1) consisting of a pair of facing engaging grooves (5) having a triangular cross section and having an inclined surface that engages with the back surface of the P') portion.
', 1''), and the protruding wall (1', 1'') is formed.
``) is configured to be able to open and close freely, and in a connected state, by fixing the protruding wall parts to each other, the bulging wall (P') part is pressed into contact with the inside of the engagement groove (5). A fitting for connecting metal piping that is characterized by: (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 a seat part (3) is provided on the connection side of the pipe (P) following the seat part. A projecting wall (P') consisting of a pair of facing engaging grooves (5) each having a triangular cross section and having an inclined surface that engages with the back surface of the outward annular bulging wall (P').
1', 1''), and the protruding wall (1', 1'') is formed with a
1") so that at least one of the protruding walls (P') can be freely opened and closed, and the protruding wall parts are fixed to each other in a connected state, thereby pressing the protruding wall (P') part into the inside of the engagement groove (5),
A joint for connecting metal pipes, characterized in that the sealing member (4) is pressed against the outer periphery of a tip (Pa) extending from the bulging wall (P'). (3) In claim 1 or 2, a tapered washer (8) 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.