JPH0510483A - Flareless fitting - Google Patents

Abstract

PURPOSE:To ensure tight sealing ability by interposing a union provided with a hard metallic sleeve between a coupling main body and a fastening nut and providing a lance for temporarily fastening a pipe on the outer peripheral portion of the sleeve. CONSTITUTION:A large diameter opening portion of a unit 8 formed so that a ring- shaped edge 5 is provided on the bottom of the inner peripheral surface of the large diameter opening portion, a conical inner surface 6 is provided on the inner peripheral end of a small-diameter opening portion, and a hard metallic sleeve 19 having a lance 24 for temporarily fastening a pipe is disposed at a fixed gap from the small-diameter portion on the inner surface of the central portion is screwed in the conical end surface 1 of a coupling main body 3. The conical end surface 1 and the edge 5 are brought into press-contact with each other to provide sealing effect, a soft metallic ring 18 is brought in press-contact with the conical inner surface 6, a fastening nut 14 having a conical inner surface 13 is screwed in, and the ring 18 is reduced in its diameter to clamp a pipe 30 inserted between the ring 18 and the sleever 19 and fix the same to provide sealing effect. In the case of rotating the pipe 30, plural slits are provided on one end surface of the ring 18 to facilitate biting into the pipe 30, so that the fastening force can be increased.

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 such as an air conditioner.

[0002]

2. Description of the Related Art Conventionally, various types of flareless pipe joints have been proposed. The "metal pipe joint" disclosed in Japanese Examined Patent Publication No. 57-48717 is a typical one, and this flareless pipe joint has a hole in which a pipe is inserted in the center and has a substantially spherical outer periphery. A metal ring is sandwiched between a joint body having a tapered inner peripheral surface and a tightening nut having a taper formed on the inner peripheral surface of the joint so as to face the taper, and is inserted into the hole of the soft metal ring. By screwing the tightening nut into the joint body with the pipe inserted, the diameter of the soft metal ring is reduced by the both tapered surfaces to clamp the pipe and fix the seal.

However, in the above means, since the pipe is clamped and fixed by reducing the diameter of the soft metal ring, when the pipe material is a soft pipe such as a copper pipe or an aluminum pipe, the pipe itself is used. Also, the diameter is reduced and deformed inward, and the pressure contact becomes insufficient, so that the bonding force and the sealing property are deteriorated.

As a means for solving the above-mentioned problems, Shokai 6
There is a "flareless pipe joint" disclosed in JP-A-4-55393. As shown in FIG.
On the inner surface of the sleeve 32 of a hard material with a collar 31 at one end
And the pipe 30 located on the outer periphery of this sleeve.
On the outer peripheral surface of the, a thick portion 37 having a tapered inner surface whose inner edge corresponds to the inclination of the conical end surface 1 of the joint body 3, an intermediate thin portion 38 having a concave inner portion, and an outer surface having a nut member 43.
The conical end face 1 of the joint body 3 is fitted by fitting the metal tube 42 formed by the engaging portion 41 having the tapered surface 39 corresponding to the inclination of the conical cam surface 44 and having the plurality of annular claws 40 inside.
And the conical cam surface 44 at the inner part of the nut member 43 presses the tapered surface 36 of the cylinder 42 and the tapered surface 39 at the other end to prevent the pipe 30 from being distorted, thereby forming an annular ring on the inner surface of the cylinder. The claw 40 is inserted into the pipe surface so as to be sealed and joined.

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

However, the structure of the joint portion varies depending on the air conditioner manufacturer, and it is not always the case that a suitable nut or metal ring (cylinder metal) is prepared as a spare. It is possible that when reconnecting the pipe,
It is a means of connecting the tip end of the cut pipe by the conventional flare pipe method.
In the method of No. 8717, the direction of the tapered portion on the joint body side is different, and in the method of No. Sho 64-55393, the cone angle of the conical end surface 1 at the tip of the joint body and the conical cam surface 44 at the inner end of the nut member are different. Since the cone angle is different, the flare pipe cannot be applied in any case.

Therefore, the present inventor previously provided a ring-shaped edge 5 on the inner peripheral surface of the large-diameter opening portion on the left side and the inner peripheral surface of the small-diameter opening portion on the right side on the conical end surface 1 of the joint body 3 shown in FIG. A large-diameter opening portion of a union 8 having a conical inner surface 6 provided with one end of a sleeve 19 made of a hard metal fixed to the inner surface of the central portion is screwed into the conical end surface 1 and the ring-shaped edge 5 to form a pressure-contact seal.
The conical inner surface 6 of the union is contacted with a soft metal ring 18 having a thin ring-shaped projecting piece 45 at one end, and from the right side thereof, a tightening nut 1 having a conical inner surface 13 on its inner surface.
4 is screwed in, the diameter of the soft metal ring 18 is reduced, and the flareless pipe joint in which the pipe 30 inserted between the soft metal ring 18 and the hard metal sleeve 19 is pinched and seal-fixed is invented and applied. is doing.

[0008]

However, in the structure shown in FIG. 9, before the nut is tightened, the pipe 30
A thin ring-shaped projecting piece is provided at one end of the soft metal ring 18 as a pipe holding means when it is inserted between the small diameter opening of the union and the hard metal sleeve 19. The holding force of the pipe is poor, and it easily shifts in the axial direction until the nut is tightened. Also, since the shift of this pipe in the union cannot be easily visually recognized, it is difficult to determine the pipe at a predetermined position. There was a problem that could not be fixed.

Further, some piping workers first connect and fix the tip of the pipe 30 to the joint body 3 and then pull out the pipe from the reel to perform a predetermined pipe. In this case, the pipe is piped. Due to strong bending and twisting, the pipe may rotate despite being tightened by the soft metal ring 18.

[0010]

The present invention is shown in FIG.
The structure of a flareless pipe joint in which a union having a hard metal sleeve is interposed between the joint body and the tightening nut is used as it is, and a lance for temporarily fixing the pipe is provided on the outer peripheral portion of the hard metal sleeve. Is.

That is, according to the present invention, the conical end surface 1 of the joint body 3 is provided with a ring-shaped edge 5 on the inner peripheral surface of the left large-diameter opening and a cone inner surface 6 on the inner peripheral end surface of the right small-diameter opening. Lance 2 for temporarily fixing the pipe on the outer surface on the inner surface of the part
A large-diameter opening of a union 8 in which a sleeve 19 made of a hard metal having a small-diameter opening 4 is arranged with a constant gap between the small-diameter opening and the conical end surface 1 and a ring-shaped edge 5
A pressure contact seal between the unions, a soft metal ring 18 is brought into contact with the conical inner surface 6 of the union, and a tightening nut 14 having a conical inner surface 13 on the inner surface is screwed in from the right side thereof to reduce the diameter of the soft metal ring 18. The present invention relates to a flareless pipe joint in which a pipe 30 inserted between the soft metal ring 18 and a hard metal sleeve 19 is pinched and fixed by a seal. Is
It is characterized in that a plurality of slits are provided on one end surface of the soft metal ring 18 to facilitate the biting into the pipe and increase the tightening force.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a flareless pipe joint according to the present invention comprises a joint body 3 having a conical end face 1 on the tip outer peripheral portion and a screw 2 on the rear outer periphery thereof, and one inner peripheral surface of a large diameter opening portion. Is provided with a female thread 4 that is screwed with the male thread 2, a ring-shaped edge 5 that contacts the conical end surface 1 is provided at the inner portion thereof, a conical inner surface 6 is provided at the inner peripheral portion of the other small diameter opening, and the outer peripheral portion thereof is provided with the conical inner surface 6. A male thread 2 having the same diameter as the male thread 2, a union 8 having an inner collar 9 at the center of the inner peripheral surface, and a female thread 11 screwed to the male thread 7 of the union at 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 at the same direction and angle as the conical end surface 1 of the joint body 3 is formed on the inner peripheral edge of the pipe insertion hole.
And a pipe insertion hole 15 at the center and a conical surface 16 at 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 inner peripheral edge of the tightening nut at the other end.
Soft metal ring 18 with conical surface 17 at the same angle as
And a sleeve 19 made of a hard metal, which has an outer diameter that can be inserted into the pipe 30, a cut step 20 is formed at one end thereof, and a lance 24 for temporarily fixing the pipe is provided on the outer peripheral portion. In the sleeve 19 made of hard metal, the inner flange 9 formed at the center of the inner peripheral surface of the union 8 is fitted into the cut step portion, and the tip end portion of the sleeve is bent outward as shown in the drawing. 21, the sleeve is fixed to the union, and the soft metal ring 18 is placed between the inner cone surface 6 of the union and the inner cone surface 13 of the nut, as shown in FIG. 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 surface 1 and the ring-shaped edge 5 are bitten into each other and sealed.
With the pipe 30 inserted from the outside of the nut between the pipe insertion hole 15 at the center of the soft metal ring 18 and the sleeve 19 made of hard metal, and held by the lance 24 for temporarily fixing the pipe so as not to come off easily. By tightening the tightening nut 14 into the union, the diameter of the soft metal ring 18 is reduced to pinch the pipe to fix the seal.

The conical surface 17 of the soft metal ring 18 on the side that abuts the conical inner surface 13 of the tightening nut 14.
2, if a plurality of slits 22 as shown in FIG. 2 are provided, when the soft metal ring 18 is tightened by the tightening nut 14, unlike the tightening of the ring having the mere conical surface 17, the presence of the slit makes the soft metal ring 18 soft. The metal ring 18 is firmly tightened so as to bite into the pipe 30.

Further, in the present invention, the lance 24 for temporarily fixing the pipe is provided on the outer peripheral surface of the sleeve 19 made of hard metal.
As shown in FIG. 3, a plurality of lances 24 formed by cutting and raising are provided on the outer peripheral surface of a tightening ring main body 23 formed of a spring material, and the lances 24 are fitted into a ring groove 25 formed on the outer periphery of the sleeve to form a ring. It is fixed by its own tightening force. When the pipe 30 is inserted into the outer circumference of the sleeve, the lance 24 is pressed against the inner peripheral surface of the pipe to prevent the pipe from coming out easily, thereby improving workability.

The lance 24 is not limited to the one shown in FIG. 3, but as shown in FIG. 4 and FIG. 5, the lance 24 is directly attached to the sleeve 19 by cutting and raising the sleeve 19 made of hard metal. You may form. In this case,
By providing a hole 29 into which the cut-and-raised tool can be inserted on the outer peripheral surface facing the lance as shown in FIG. 5, the cut-and-raised tool can be inserted from this hole to easily form the lance 24 on the opposed surface. .

Further, reference numeral 26 in the drawing denotes a C-shaped ring made of hard synthetic resin provided on the outer peripheral portion of the union 8 for preventing rotation operation. As shown in FIG. 6, the outer surface is circular and the rim 27 is formed at the center of the inner surface. 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 to prevent this rotation operation
When the union is tightened to the joint body 3 and then fitted from the side, when the tightening nut 14 is screwed into the union 8, the union cannot be applied to the union with a spanner. To do so.

[0018]

EFFECTS OF THE INVENTION The flareless pipe joint according to the present invention has the above-described structure, so that 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.
Due to the action of 4, the pipe is temporarily fastened and becomes difficult to come out easily, so the operation of tightening and fixing is simple. Also, since a plurality of slits are provided at one end of the soft metal ring, When tightened, 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 the air conditioner is moved, the pipe 30 is cut outside the tightening nut 14, and the tip portion of the pipe is flared by the conventional method. In addition, the flare portion of the pipe can be sandwiched between the conical inner surface 13 of the tightening nut 14 and the conical end surface 1 of the joint body to be fixed by sealing.
Therefore, even if there is no spare union, soft metal ring, sleeve, etc., pipe connection is possible. further,
After tightening the union, a C-shaped ring for rotation prevention is rotatably fitted to the outer peripheral portion of the union, so that the reverse operation at the time of tightening the nut can be prevented, so that there is an effect that a tight sealing property can be secured.

[Brief description of drawings]

FIG. 1 is a vertical sectional 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 vertical sectional side view of a central portion of a hard metal sleeve provided with a lance directly.

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

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

FIG. 7 is a vertical cross-sectional side view showing a state of connection by a flare method.

[Figure 8] Semi-longitudinal side view of conventional product

FIG. 9 is a vertical sectional side view of an example of the prior application.

[Explanation of symbols]

1 Cone End Surface 3 Joint Body 5 Ring Edge 6 Cone Inner Surface 8 Union 13 Cone Inner Surface 14 Tightening Nut 18 Soft Metal Ring 19 Sleeve 20 Cone Inner End Surface 22 Slit 24 Lance 26 C-Shaped Ring 27 Rim 30 Pipe 45 Ring-shaped Projecting Piece

Claims (5)

[Claims] 1. A conical end surface 1 of a joint body 3 is provided with a ring-shaped edge 5 on the inner peripheral surface of the left large diameter opening and a conical inner surface 6 on the inner peripheral end surface of the right small diameter opening. A sleeve 19 made of a hard metal having a lance 24 for temporarily fixing the pipe on the outer periphery is screwed into the large diameter opening of the union 8 in which a certain gap is provided between the sleeve 19 and the small diameter opening, and the conical end face 1 and the ring are formed. The edges 5 are sealed by pressure contact,
A soft metal ring 18 is brought into contact with the conical inner surface 6 of the union, and a tightening nut 14 having a conical inner surface 13 on the inner surface is screwed from the right side of the union to reduce the diameter of the soft metal ring 18 to make the soft metal ring 18. A flareless pipe joint in which a pipe 30 inserted between a ring 18 and a sleeve 19 made of hard metal is pinched and fixed by a seal. 2. The flareless pipe joint according to claim 1, wherein the soft metal ring 18 has a plurality of slits 22 at one end thereof. 3. The flareless pipe joint according to claim 1, wherein a plurality of lances 24 are provided by cutting and raising on an outer peripheral surface of a tightening ring body 23 formed of a spring material, and the tightening ring body 23 is made of a hard metal. A flareless pipe joint which is fitted in a ring groove 25 formed on the outer periphery of the sleeve and fixed in a tightened state. 4. The flareless pipe joint according to claim 1, wherein the lance 24 is formed by cutting and raising the outer peripheral surface of the sleeve 19 itself made of hard metal. 5. The flareless pipe joint according to claim 1, wherein a rotational operation preventing ring 26 made of synthetic resin is provided on a square outer peripheral portion of the union 8.