JPH1130368A - Piping joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a problem of losing, etc., a small part at the time of work and to easily and certainly connect the piping. SOLUTION: When a screw body 6 is firmly fastened in a main body 3, an end part of a truncated conical ring body 4 is pushed by a pressing body 9 inside of the screw body 6, a head end is guided to a ring taper 1 and advances inward in the main body 3, an aperture of the head end of the ring body 4 is contracted, and it bites into an outer peripheral surface of piping P1 around its head end inner edge as its center. Simultaneously, the ring body 4 is firmly sandwiched between the ring taper 1 and the pressing body 9, and the piping P1 is connected to the main body 3. A holding body 8 overhanging outward of the ring body 4 is engaged and held on a ring recessed point 7 of the screw body 6, and the ring body 4 is integrated inward of the screw body 6. Consequently, at the time of connection, the ring body 4 is never dropped even if the screw body 6 is removed from the main body 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a pipe joint used in the field of an air conditioner.

[0002]

2. Description of the Related Art Conventionally, for example, when connecting a refrigerant pipe between an indoor unit and an outdoor unit of an air conditioner, as shown in FIG. 5, a main body U having a receiving hole J of a pipe P continuous with an annular taper T, as shown in FIG.
A frusto-conical ring body F (a so-called front ferrule) facing the annular taper T, a fastening nut N having an insertion hole H for a pipe P at an end, and a nut N which is received in the inner step D of the nut N A pipe joint having a pressing ring R for pressing the end of the ring body F by tightening N is used.

[0003] Then, the pipe P to be connected is received in the receiving hole J through the insertion hole H, and the nut N is tightened, so that the ring F is advanced along the annular taper T by the pressing force of the pressing ring R. The tip of the ring F is cut into the outer circumference of the pipe P, and the outer circumference of the ring F is pressed against the annular taper T to connect the pipe P to the main body U.

[0004]

However, in the prior art, the wheel body F and the pressing ring R are simply fitted inside the nut N, and when the nut N is removed, these small parts become nuts. It easily separates from N.
For this reason, there is a problem that the serviceman drops these small parts during the work, and it takes time to search or loses them.

In particular, since the pressing ring R is a small part having a low height, there is a risk that the ring R may be forgotten to be inserted, and only the wheel body F may be loaded into the nut N and tightened. In such a case as well, if the nut N is excessively tightened, the ring body F is slightly pressed against the annular taper T and advances slightly, so that it looks as if it were joined. For this reason, the service person does not notice this defect, and there is also a problem that gas leakage or the like may occur later due to incomplete coupling.

A main object of the present invention is to solve the problem of losing small parts during work and to provide a pipe joint which can easily and surely connect pipes.

[0007]

According to the first aspect of the present invention,
In order to achieve the main object, as shown in FIG. 1 or FIG. 4, a main body 3 having a pipe receiving hole 2 continuous with an annular taper 1, a frustoconical ring body 4 facing the annular taper 1, and a pipe at an end portion. In a pipe joint provided with a screw body 6 for fastening having an insertion hole 5, an annular recess 7 is provided around the pipe insertion hole 5 inside the screw body 6, and the recess 7 The holding body 8 that protrudes outward is locked, and a pressing body 9 that presses the end of the ring body 4 is provided at the bottom of the recess 7 so as to protrude.

As shown in FIG. 1, the main body 3 has a double joint having the same structure having tapered receiving holes 2 and 2 for a pair of pipes P1 and P2 to be connected to both sides. As shown in FIG. 4, the pipe P1 to be connected to only one side may have a tapered receiving hole 2, and the other side may be a single type in which the pipe P2 is brazed.

According to the second aspect of the present invention, the holding mechanism 8 is fitted into a groove 40 provided on the outer periphery of the wheel body 4 as shown in FIG. It consisted of a split ring 80 to be combined. The groove 40 is the ring 4
May be provided only on a part of the outer periphery, or only on a part thereof. Further, the splits of the split ring 80, that is, the slits 81 may be provided diagonally in addition to being provided in the radial direction.

[0010]

According to the first aspect of the present invention, as shown in FIG. 1, the holding member 8 projecting outward from the ring body 4 is locked in the annular recess 7 of the screw body 6, and 4 is integrally held inside the screw body 6. For this reason, even if the screw body 6 is removed from the main body 3, it is possible to prevent the ring body 4 from being dropped and lost.

Then, with the screw body 6 holding the ring body 4 loosely screwed to the main body 3, the pipe P 1 to be joined is inserted into the pipe receiving hole 2 of the main body 3 through the pipe insertion hole 5 of the screw body 6. Then, the screw body 6 is tightened. Alternatively, with the screw body 6 separated from the main body 3 fitted in the pipe P1, the tip of the pipe P1 is inserted into the pipe receiving hole 2 of the main body 3, and the screw body 6 is tightened into the main body 3.

From the state of FIG. 1 to the state of FIG.
When the screw body 6 is tightly fastened to the main body 3, the end of the ring body 4 is pushed by the pressing body 9 inside the screw body 6, and the tip end is an annular taper 1
And advance into the body 3. For this reason,
The diameter of the front end of the ring body 4 is reduced, and the outer periphery of the pipe P1 is bitten around the inner edge of the front end. At the same time, the wheel body 4 is firmly sandwiched between the annular taper 1 and the pressing body 9. Thus, the pipe P1 is connected to the main body 3.

As described above, even when the screw body 6 is separated from the main body 3 when the pipe P1 is connected, small parts do not drop. In addition, in order to hold the ring body 4, the presence of the annular recess 7 for locking the holding body 8 that protrudes outward, the pressing body 9 corresponding to the conventional pressing ring R protrudes at the bottom thereof. With such a structure, even if the ring body 4 is forcibly pulled out, the pressing body 9 will not be lost. Therefore, even if the wheel 4 is accidentally pulled out, a proper and reliable connection is performed by resetting only the wheel 4.

According to the second aspect of the present invention, as shown in FIG. 3, the groove 40 can be easily provided on the outer periphery of the wheel body 4. Further, the split ring 80 constituting the holder 8 can be obtained at low cost. Then, as shown in FIG.
0 is inserted into the annular recess 7 of the screw body 6 with the diameter reduced by escaping the crack, and then the ring 4 is inserted from the rear end.
The concave groove 40 and the split ring 80 are fitted. This allows
The ring body 4 can be held on the screw body 6 simply and inexpensively.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A piping joint shown in FIG. 1 is for connecting refrigerant pipes P1 and P2 between an indoor unit and an outdoor unit of an air conditioner. A pipe receiving hole 2 for receiving the indoor unit pipe P1 or the outdoor unit pipe P2 is provided symmetrically, and each of the receiving holes 2 is connected to a communication hole 21.
And has a double-type main body 3 communicated with the main body. Since the joint structure at both ends is completely symmetrical, hereinafter, the indoor unit piping P1 will be described.
The structure of the joint part will be described in detail.

The angle α of the annular taper 1 is, for example, about 35 °, and the angle β of the frustoconical ring 4 facing the taper 1 is, for example, 30 smaller than that.
° degree. A threaded body 6 made of a fastening nut having a pipe insertion hole 5 at an end is provided in the threaded portion 30 of the main body 3.
And an annular recess 7 is provided inside the screw body 6 around the pipe insertion hole 5.

As shown in FIG. 3, the ring body 4 is provided with a V-shaped shallow groove 40 on the outer peripheral surface near the rear end.
At 0, a split ring 80 with a radial slit 81 constituting the holding body 8 is fitted and locked. Actually, first, the split ring 80 is first inserted into the screw body 6 from the screw side and received and locked in the annular recess 7, and in this state, the ring body 4 is inserted rearward from the rear, and the groove 40 and the split ring are inserted. 80 with the inner edge.

As shown in FIG. 1, the annular body 7 is formed at the bottom of the annular recess 7 of the screw body 6 so as to be continuous with the pipe insertion hole 5.
And a thin cylindrical pressing body 9 for pressing the rear end of the housing. The tip of the pressing body 9 is formed in a truncated cone shape, and the angle θ is, for example, about 80 °. On the other hand, as shown in FIG.
An inner side chamfered portion 41 of about ° is formed.

The main body 3 and the wheel body 4 are made of, for example, C3604BD, and the screw body 6 is made of, for example, C3604.
The split ring 80 is made of, for example, a PFA sheet having a thickness of about 0.3 mm. The pipes P1 and P2 are made of a copper pipe made of a material softer than the main body 3, the ring body 4, and the screw body 6.

When the screw body 6 is tightened from the state shown in FIG. 1 to the state shown in FIG. 2, the chamfered portion 41 at the inner edge of the rear end of the ring body 4 is pressed by the pressing body 9 having a truncated cone shape, and The tip of the body 4 is guided by the annular taper 1 and advances inward of the body 3. At this time, a difference in hardness of the material between the body 3, the ring 4, the screw 6 and the pipe P1, a difference in angles α and β between the annular taper 1 and the tip of the ring 4, and The difference between the angles θ and ω with respect to the rear end of the ring body 4 and the thickness of the pressing body 9 are different from each other.
It contributes to the completion of a better bonding state.

That is, as shown in FIG. 2, the inner diameter of the wheel body 4 is gradually reduced satisfactorily around its distal end by the advance of the wheel body 4 by tightening the screw body 6, and the entire length in the longitudinal direction is reduced. It digs into the outer peripheral surface of the pipe P1. At the same time, the thin pressing body 9 protrudes from the chamfered portion 41 of the ring body 4 and contracts slightly inward, and again, bites the outer periphery of the pipe P1. At the same time, the ring body 4 is firmly sandwiched between the annular taper 1 and the pressing body 9, and the pipe P1 is securely connected to the main body 3.

Incidentally, the inner edge of the front end of the ring body 4 which is the starting point of biting into the pipe P1 is left as it is without being chamfered, so that the effect of biting into the pipe P1 is further enhanced. ing.

In the above-described embodiment, a double joint having the same structure having the pipe receiving holes 2 and 2 with the annular tapers 1 and 1 on both sides is provided, as shown in FIG. Alternatively, a single type having a pipe receiving hole 2 with an annular taper 1 only on one side and a taperless pipe receiving hole 20 on the other side, and directly connecting the pipe P2 to this through a brazing portion 22 may be used. Also in this case, the joint structure to the pipe receiving hole 2 with the annular taper 1 is exactly the same as above,
The effect is the same.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a first embodiment of the present invention at an early stage of coupling.

FIG. 2 is a cross-sectional view when the coupling is completed.

FIG. 3 is an enlarged view of a ring body.

FIG. 4 is a sectional view of a second embodiment of the present invention.

FIG. 5 is a sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1; Annular taper 2; Pipe receiving hole 3; Main body 4; Ring body 40; Groove 5; Piping insertion hole 6; Screw body 7;

Claims (2)

[Claims] 1. A body (3) having a pipe receiving hole (2) continuous with an annular taper (1), a frustoconical ring body (4) facing the annular taper (1), and a pipe insertion hole at an end. In a pipe joint provided with a fastening screw body (6) having 5), an annular recess (7) is provided around a pipe insertion hole (5) inside the screw body (6), and this recess is provided. At (7), a holding body (8) projecting outward from the ring (4) is locked, and a pressure is applied to the bottom of the recess (7) to press the end of the ring (4). A pipe joint characterized by projecting a body (9). 2. The pipe joint according to claim 1, wherein the holding body (8) comprises a split ring (80) fitted in a groove (40) provided on the outer periphery of the ring body (4).