JP3073797B2 - Flareless fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reusable flareless pipe joint mainly used for a refrigerant pipe of an air conditioner or the like.

[0002]

2. Description of the Related Art Conventionally, various types of flareless pipe joints have been invented. Japanese Patent Publication No. 57-48717 "Metal pipe joint" is a typical one, which is formed with a hole through which a pipe is inserted in the center, a ring made of soft metal with a substantially spherical outer periphery, and a tapered inner peripheral surface at the tip. The clamp body is sandwiched between the formed joint body and the tightening nut having a tapered inner peripheral surface facing the taper, and the tightening nut is inserted into the joint body in a state where a pipe is inserted through the hole of the soft metal ring. By screwing in, the soft metal ring is reduced in diameter at the two tapered surfaces, and the pipe is pressed to seal and fix.

However, in the above-mentioned means, since the pipe is pinched and fixed by reducing the diameter of the soft metal ring, when the pipe is made of a soft pipe such as a copper pipe or an aluminum pipe, the pipe itself is not fixed. Also, the inner diameter is reduced inward, and the pressure contact is insufficient, so that the bonding strength and the sealing performance are reduced.

As a solution to the above problem, Japanese Utility Model Application Laid-Open No.
There is a "flareless pipe joint" of 4-55393. As shown in FIG. 4, a hard material sleeve 32 having a flange 31 at one end is interposed on the inner surface of the pipe 30, and a tip inner edge is formed on an outer peripheral surface of the pipe 30 located on the outer periphery of the sleeve. A thick portion 37 having a tapered surface 36 corresponding to the inclination of the tapered surface 1 at the end of the joint body 3 , an intermediate thin portion 38 having a concave inside, and an outer surface corresponding to the inclination of the conical cam surface 44 of the nut member 43. A cylindrical metal 42 formed by a locking portion 41 having a plurality of annular claws 40 on the inner side and having a tapered surface 39 formed therein is fitted, and the tapered surface 1 at the distal end of the joint body 3 and the cone at the back of the nut member 43 are fitted. By pressing the tapered surface 36 of the cylinder with the cam surface 44, the pipe 30 is pressed.
Without distorting the ring, the annular pawl 40 on the inner peripheral surface of the tube is inserted into the pipe surface to seal and join.

[0005]

However, in any of the above cases, the surface of the pipe is tightened by using a deformation of a soft metal ring or a cylindrical metal by screwing a tightening nut into the joint body. Once tightened, the ring or tube cannot be reused. However, in reality, there are cases where it is necessary to relocate the air conditioner (air conditioner) due to a mistake in mounting, a move or a change in the installation location, or the like. In such a case, if the nut is removed from the joint main body, the pipe is detached from the joint main body, but the plastically deformed metal ring and the cylindrical metal are not detached from the pipe. Then, even if this pipe is reused, a reliable sealing property cannot be obtained. In practice, the pipe is cut outside the portion where the seal portion and the sleeve are fitted (not shown), and the pipe is separately prepared again. It had to be tightened with a new soft metal ring or a sleeve and sleeve.

[0006] However, the structure of the joint portion varies depending on the air conditioner maker, and a fitting nut or metal ring (tube metal) is not always prepared as a spare. Therefore, when reconnecting the pipe, I thought that the tip of the cut pipe should be connected by the conventional flare pipe method. tapered surface of the joint body tip with a different direction of the tapered portion, also scheme "flareless fittings"
1 and the conical cam surface 44 at the back end of the nut member.
Since the taper angles are different, the flare pipe cannot be applied in any case.

[0007]

According to the present invention, a pipe made of a soft metal ring whose outer peripheral edges are arc-shaped or tapered is used for diameter reduction and fixing of a pipe, and a conventional most reliable seal is used for sealing with a joint body. A metal seal is employed by pressing a ring-shaped edge, and a union is interposed between a joint body and a tightening nut.

That is, one of the basic constitutions of the present invention is that a ring-shaped edge 5 is provided on the inner peripheral surface of the left large-diameter opening on the tapered surface 1 at the distal end of the joint body 3 and the inside of the small-diameter opening on the right is provided. The large- diameter opening of the union 8 having the tapered surface 6 provided on the peripheral surface is screwed in, and the gap between the tapered surface 1 at the tip and the ring-shaped edge 5 is pressed and sealed.
A soft metal ring 18 is brought into contact with the ring, and a tightening nut 14 having a conical inner surface 13 on its inner surface is screwed in from the right side of the ring to reduce the diameter of the soft metal ring 18 and placed inside the soft metal ring. It is characterized in that the pipe 30 is pressed and sealed with a seal.

[0009]

EXAMPLES The present invention is Te a tip outer peripheral portion as shown in FIG. 1
Supermarkets surface 1 and the joint body 3 with an external thread 2 on the rear outer circumference, provided with the external thread 2 screwed to the internal thread 4 on one of the large-diameter opening inner peripheral surface, the taper of the tip portion to the inner portion surface
1 and a conical inner surface 6 on the inner periphery of the other small-diameter opening, and the outer thread 2 on the outer periphery.
A union 8 provided with a male screw 7 having the same diameter as the above, a female screw 11 screwed into the union male screw 7 on one inner peripheral surface, and a pipe insertion hole 12 provided at the other end; At the inner peripheral edge of the hole, a tapered surface 1 at the tip of the joint body 3
A ring-shaped tightening nut 14 having a tapered surface 13 formed in the same direction and at the same angle, and a pipe insertion hole 15 at the center, and an arc surface having an angle smaller than that of the conical inner surface 6 of the union inner peripheral portion at one end of the outer peripheral edge. And a soft metal ring 18 having a conical surface 17 at the same angle as the conical inner surface 13 of the inner periphery of the tightening nut at the other end. These are assembled in advance as one set.

According to the present invention, the union in the set state is
After screwing into the joint body 3, the tapered surface 1 at the tip end and the ring-shaped edge 5 are inserted and sealed, and then the pipe 30 is externally tightened with a nut and the soft metal ring 1.
By inserting the tightening nut 14 into the union by inserting it into the pipe insertion holes 12 and 15 at the center of the eight, the diameter of the soft metal ring 18 is reduced, and the pipe 30 is pressed and sealed and fixed.

In the figure, reference numeral 19 denotes a hard metal sleeve 19 having an outer diameter capable of being inserted into the pipe 30, and a cut step 20 formed at one end thereof. The inner flange 9 formed at the center of the inner peripheral surface of the union 8 is fitted into the union 8, and the distal end of the sleeve 19 is bent outward as shown to form a swaged portion 21.
Can be fixed to the union 8.

When this sleeve 19 is used, the pipe 30 is inserted between the outer peripheral portion of the sleeve and the inner peripheral portion 10 of the small-diameter opening of the union 8, and is sealed from the outside by reducing the diameter of the soft metal ring 18. Will be done. Therefore, the sleeve 19 only needs to be at a predetermined position when fixing the pipe, and it is not always necessary to fix the sleeve by crimping to the inside of the union. When the sleeve 19 is prepared as a set together with the ring 18 and the fastening nut 14, it is convenient because the members are not separated.

The soft metal ring 18 shown in FIG. 2 has a thin ring-shaped projecting piece 24 having an inner diameter D1 smaller than the outer diameter D2 of the pipe 30 at the tip of the arcuate surface 16 thereof.
Is provided, when the pipe 30 is inserted into the pipe joint, the ring-shaped protruding pieces 24 bite into the outer peripheral surface of the pipe 30 to temporarily fix the pipe. Even if a force (a force acting in a direction in which the pipe comes out of the pipe joint) is applied, the pipe 30 does not shift and can be fixed to the soft metal ring 18 in a normal position to improve the reliability of the seal and improve workability. Also improve.

[0014]

According to the present invention having the above-described structure, the operation of fastening and fixing is simple and reliable. And
In case of fitting mistakes or when moving the air conditioner,
The pipe 30 is cut outside the tightening nut 14, and the tip of the pipe is flared by a conventional method.
As described above, the flare portion of the pipe can be sealed and fixed between the conical inner surface 13 of the tightening nut 14 and the tapered surface 1 at the distal end of the joint body. Therefore, even if there is no spare union, soft metal ring, sleeve, or the like, pipe connection can be performed quickly.

[Brief description of the drawings]

FIG. 1 is a vertical side view of an example of the present invention.

FIG. 2 is an enlarged longitudinal sectional side view near a ring before tightening a nut.

FIG. 3 is a vertical sectional side view in a state where the connection is made by a flare method.

FIG. 4 is a semi-longitudinal side view of a conventional product.

[Description of Signs ] 1 Tapered surface . 3 Fitting body.
5 Ring edge. 6 Inside the cone. 8 Union. 1
3 Tapered surface . 14 Tightening nut. 18 Soft metal ring.
19 sleeve. 20 End face inside the cone. 24 Ring-shaped projecting pieces.
30 pipes.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16L 19/08

Claims (4)

(57) [Claims] 1. A large union (8) having a ring-shaped edge (5) on the inner peripheral surface of a large-diameter opening on the left side and a conical inner surface (6) on an inner peripheral surface of a small-diameter opening on the right side on the tapered surface (1) at the distal end of the joint body (3). The diameter opening is screwed in, the pressure-tight sealing between the tapered surface 1 at the tip and the ring-shaped edge 5 is performed, a soft metal ring 18 is abutted on the inner conical surface 6 of the union, and a tapered surface 13 is formed on the inner surface from the right. Tightening nut 14 provided
A flareless pipe joint, wherein a diameter of the soft metal ring 18 is reduced, and a pipe 30 disposed inside the soft metal ring 18 is pressed and sealed and fixed. 2. A flareless pipe joint according to claim 1, wherein a hard metal sleeve is provided on an inner periphery of the pipe. 3. The flareless pipe joint according to claim 2, wherein one end of a hard metal sleeve is fixed to a central inner inner surface of the union. 4. The flareless pipe joint according to claim 3, wherein the soft metal ring (18) is provided at the tip of the circular arc surface (16).
A flareless pipe joint comprising a thin ring-shaped protruding piece having an inner diameter dimension smaller than an outer diameter dimension of a pipe.