JP3120186B2 - 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 fitting 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 proposed. "Metal fittings" disclosed in Japanese Patent Publication No. 57-48717 is a typical example. This flareless fitting has a soft hole which has a hole formed in the center of the pipe and has a substantially spherical outer periphery. A metal ring is sandwiched between a joint body having a tapered inner peripheral surface at the distal end and a tightening nut having a tapered inner peripheral surface facing the taper, and a hole formed in the soft metal ring. By screwing a tightening nut into the joint body with the pipe inserted, the diameter of the soft metal ring is reduced at both taper surfaces to clamp the pipe and seal it.

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" disclosed in 4-55393. This is achieved by connecting the pipe 30 as shown in FIG.
A hard material sleeve 32 having a flange 31 at one end.
And a pipe 30 located on the outer periphery of the sleeve.
A thick portion 37 having a tapered surface 36 whose inner edge at the tip coincides with the inclination of the conical end surface 1 of the joint body 3, an intermediate thin portion 38 recessed on the inside, and a nut member 43
A cylindrical metal 42 formed of a locking portion 41 having a tapered surface 39 corresponding to the inclination of the conical cam surface 44 and having a plurality of annular claws 40 is fitted therein, and the conical end surface 1 of the joint body 3 is formed.
By pressing the tapered surface 36 of the tube 42 and the tapered surface 39 at the other end thereof with the conical cam surface 44 at the back of the nut member 43, the pipe 30 is not distorted and the annular inner circumferential surface of the tube is not distorted. The claw 40 is inserted into the surface of the pipe to seal and join.

However, in any case, the surface of the pipe is tightened by screwing a tightening nut into the joint body and using the deformation of a soft metal ring or a cylindrical metal. Gold cannot be reused. However, in reality, there is a case where the air conditioner (air conditioner) is relocated due to a mistake in mounting, a move or a change in an installation location, or the like. In such a case, if the nut is removed from the joint main body, the pipe will come off from the joint main body, but the plastically deformed metal ring or tube will not come off the pipe. Then, even if this pipe is reused, a reliable sealing property cannot be obtained. Therefore, at the work site, the pipe is cut outside the portion where the seal portion and the sleeve are fitted (P position in FIG. 8), and again, It must be tightened with a new soft metal ring or a sleeve and sleeve.

[0006] However, the structure of the joint varies depending on the air conditioner manufacturer, and it is not always the case that a suitable nut or metal ring (tube metal) is prepared as a spare. So, when reconnecting the pipe,
In this method, the end of the cut pipe is connected by a conventional flare pipe method.
In the method of No. 8717, the direction of the taper portion on the joint body side is different, and in the method of Japanese Utility Model Application Laid-Open No. 55553/1988, the cone angle of the conical end face 1 at the tip of the joint body and the conical cam face 44 at the back end of the nut member. Flare pipes cannot be applied in any case because the cone angles are different.

The inventor of the present invention first provided a ring-shaped edge 5 on the inner peripheral surface of the left large-diameter opening on the conical end surface 1 of the joint body 3 shown in FIG. A large-diameter opening of a union 8 having a conical inner surface 6 provided therein and having one end of a hard metal sleeve 19 fixed to a central inner surface is screwed into the conical end surface 1 and the ring-shaped edge 5 to be pressed and sealed.
A soft metal ring 18 having a thin-walled ring-shaped protruding piece 45 at one end thereof is brought into contact with the conical inner surface 6 of the union. From the right side, the tightening nut 1 having a conical inner surface 13 on the inner surface.
4 is screwed in, the soft metal ring 18 is reduced in diameter, and a pipe 30 inserted between the soft metal ring 18 and the hard metal sleeve 19 is pressed to seal and fix the flareless pipe joint. doing.

[0008]

However, in the arrangement shown in FIG. 9, prior to the tightening of the nut, a pipe 30 is required.
A thin-walled ring-shaped protruding piece is provided at one end of a soft metal ring 18 as a pipe holding means when inserted between the small diameter opening of the union and the hard metal sleeve 19. The pipe holding force is poor in endurance, it is easily displaced in the axial direction until the nut is tightened, and the displacement of this pipe in the union cannot be easily identified from the outside, so the pipe must be fixed at a predetermined position. There is a problem that it cannot be fixed.

[0009] Further, some piping operators connect the pipe 30 to the joint body 3 first and then pull out the pipe from the reel to perform predetermined piping. In some cases, strong bending or torsion is applied to the pipe, and the pipe may rotate despite being tightened by the soft metal ring 18.

[0010]

The present invention is shown in FIG.
Using a flareless pipe joint configuration in which a union provided with a hard metal sleeve is interposed between a joint body and a tightening nut, and providing a lance for temporarily fixing a pipe on the outer periphery of the hard metal sleeve It is.

That is, according to the present invention, a ring-shaped edge 5 is provided on the inner peripheral surface of the large-diameter opening on the left side of the conical end surface 1 of the joint body 3, and a conical inner surface 6 is formed on the inner peripheral end surface of the small-diameter opening on the right side. A lance 2 for pipe temporary fixing is provided on the outer surface
4 is screwed into the large-diameter opening of the union 8 in which a fixed metal sleeve 19 having a constant gap is provided between the small-diameter opening and the conical end face 1 and the ring-shaped edge 5.
A pressure seal is provided between the conical inner surfaces 6 of the union .
A soft metal ring 18 having a lit 22 on one end surface is abutted, and a tightening nut 14 having a conical inner surface 13 on its inner surface is screwed in from the right side to reduce the diameter of the soft metal ring 18 so that the soft metal ring 18 is reduced in diameter. ring 18 and Ri engaging the pipe 30 inserted between the rigid metal sleeve 19 to flareless tube fittings, characterized in that the clamping pressure seal fixing, for the rotation of the pipes, the soft metal ring 18 since a plurality of slits on one end face, in which it is increased Succoth a clamping force to facilitate biting into the pipe.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A flareless pipe joint according to the present invention, as shown in FIG. 1, has a joint body 3 having a conical end face 1 on the outer periphery of a tip and a screw 2 on the outer periphery behind the conical end face, and an inner periphery of one large-diameter opening. A female screw 4 screwed with the male screw 2, a ring-shaped edge 5 in contact with the conical end face 1 at the back thereof, a conical inner surface 6 at the other small-diameter opening inner periphery, and a conical inner surface 6 at the outer periphery thereof. A union 8 having an external thread 7 having the same diameter as the external thread 2 and an inner flange 9 at the center of the inner peripheral surface; and a female screw 11 screwing with the external thread 7 on one inner peripheral surface; A ring-shaped tightening nut 14 having a pipe insertion hole 12 at the other end, and a conical inner surface 13 having the same direction and the same angle as the conical end surface 1 of the joint main body 3 formed on the inner peripheral edge of the pipe insertion hole.
And a pipe insertion hole 15 at the center, a conical surface 16 having the same angle as the conical inner surface 6 of the union inner peripheral portion at one end of the outer peripheral edge, and a conical inner surface 13 of the tightening nut inner peripheral edge at the other end.
Soft metal ring 18 with conical surface 17 at the same angle as
And a hard metal sleeve 19 having an outer diameter capable of being inserted into the pipe 30, having a notch step 20 formed at one end thereof, and a lance 24 for temporarily fixing the pipe at the outer peripheral portion. A sleeve 19 made of a hard metal is fitted with an inner flange 9 formed at the center of the inner peripheral surface of the union 8 in a notch step portion, and a distal end portion of the sleeve is bent outward as shown in FIG. 21, the sleeve is fixed to the union, and the soft metal ring 18 is placed between the inner conical surface 6 of the union and the inner conical surface 13 of the nut, as shown in FIG. It is what is assembled as.

In the present invention, the union in the set state is screwed into the joint main body 3 so that the conical end face 1 and the ring-shaped edge 5 are sealed and sealed.
The pipe 30 is inserted from the outside of the nut between the pipe insertion hole 15 at the center of the soft metal ring 18 and the hard metal sleeve 19, and is held by a pipe temporary fixing lance 24 so as not to be easily pulled out. By screwing the fastening nut 14 into the union, the diameter of the soft metal ring 18 is reduced, and the pipe is pressed to seal and fix.

The conical surface 17 on the side of the soft metal ring 18 which comes into contact with the conical inner surface 13 of the tightening nut 14.
If a plurality of slits 22 are provided as shown in FIG. 2, when the soft metal ring 18 is tightened by the tightening nut 14, unlike the case of simply tightening the ring having the conical surface 17, a soft The metal ring 18 is firmly tightened so as to bite into the pipe 30.

Further, in the present invention, a lance 24 for temporarily fixing a pipe provided on the outer peripheral surface of the sleeve 19 made of a hard metal.
As shown in FIG. 3, a plurality of cut-and-raised lances 24 are provided on the outer peripheral surface of a tightening ring main body 23 formed of a spring material. It is fixed by its own tightening force. When the pipe 30 is inserted into the outer periphery of the sleeve, the lance 24 presses against the inner peripheral surface of the pipe to prevent the pipe from easily coming off, thereby improving workability.

The lance 24 is not limited to the one shown in FIG. 3, but is directly connected to the sleeve 19 by cutting and raising the sleeve 19 itself as shown in FIGS. It may be formed. In this case, FIG.
By providing a hole 29 into which the cutting and raising tool can be inserted on the outer peripheral surface facing the lance as shown in FIG. 3, the lance 24 can be easily formed on the surface facing the cutting and raising tool by inserting the tool. .

Further, in the figure, reference numeral 26 denotes a C-shaped ring made of a hard synthetic resin for preventing rotation operation, which is provided on the outer peripheral portion of the square of the union 8. The outer surface is circular as shown in FIG. The rim 27 of the C-shaped ring is rotatably fitted in a ring groove 28 formed in the center of the rectangular outer peripheral portion of the union. C for preventing this rotation operation
After the union is fastened to the joint body 3 after the union is fastened to the joint body 3, when the tightening nut 14 is screwed into the union 8, a force in a direction opposite to the tightening direction of the nut is not applied to the union with a spanner. Is to do so.

[0018]

According to the flareless pipe joint according to the present invention, when the pipe 30 is inserted into the inner peripheral portion 10 of the small diameter opening of the union 8 as shown in FIG.
By the action of 4, the pipe is temporarily fixed and becomes difficult to be easily pulled out, so that the operation of tightening and fixing is simple, and since one end of the soft metal ring is provided with a plurality of slits, the tightening nut is used. When tightening, the soft metal ring is firmly and securely tightened so as to bite into the pipe. Then, in the case of a fitting error of the pipe joint 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 shown in FIG. In addition, the flare portion of the pipe can be clamped between the conical inner surface 13 of the nut 14 and the conical end surface 1 of the joint body to be fixed by sealing.
Accordingly, pipe connection is possible even when there is no spare union, soft metal ring, sleeve, or the like. further,
After the union is tightened, the C-shaped ring for rotation prevention is rotatably fitted to the outer periphery of the union so that the reverse rotation operation at the time of tightening the nut can be prevented, so that there is also an effect that a tight sealing property can be secured.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of a soft metal ring.

FIG. 3 is a perspective view of a lance.

FIG. 4 is a longitudinal sectional side view of a central portion in a state where a lance is directly provided on a hard metal sleeve.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a perspective view of a C-shaped ring and a union for preventing rotation operation.

FIG. 7 is a longitudinal sectional side view in a state of being connected by a flare method.

FIG. 8 is a semi-longitudinal side view of a conventional product.

FIG. 9 is a longitudinal sectional side view of an example according to the prior application.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Conical end face 3 Joint main body 5 Ring-shaped edge 6 Conical inner face 8 Union 13 Conical inner face 14 Tightening nut 18 Soft metal ring 19 Sleeve 20 Conical inner end face 22 Slit 24 Lance 26 C-shaped ring 27 Rim 30 Pipe 45 Ring-shaped protruding piece

Claims (4)

(57) [Claims] 1. A ring-shaped edge 5 is provided on the inner peripheral surface of a large-diameter opening on the left side of a conical end surface 1 of a joint body 3, and a conical inner surface 6 is provided on an inner peripheral end surface of a small-diameter opening on the right side. A hard metal sleeve 19 having a lance 24 for temporarily fixing a pipe is screwed into the large-diameter opening of the union 8 in which a fixed gap is provided between the large-diameter opening and the conical end surface 1 and a ring. Pressure sealing between the edge 5
A plurality of slits 22 are formed on one end face of the inner face 6 of the union.
A soft metal ring 18 having a conical inner surface 13 is screwed in from the right side to reduce the diameter of the soft metal ring 18 so that the soft metal ring 18 and the hard metal ring A flareless pipe joint characterized in that a pipe 30 inserted between the pipe and a sleeve 19 is pressed and sealed. 2. A flareless pipe joint according to claim 1, wherein a plurality of lances are provided by cutting and raising on an outer peripheral surface of a tightening ring main body formed of a spring material, and the tightening ring main body is made of hard metal. A flareless pipe joint which is fitted in a ring groove 25 formed on the outer periphery of a sleeve and fixed in a tightened state. 3. The flareless pipe joint according to claim 1, wherein the lance is formed by cutting and raising an outer peripheral surface of the sleeve made of hard metal itself. 4. The flareless pipe joint according to claim 1, wherein a rotation preventing ring made of synthetic resin is provided on the outer periphery of the union.