JPS5939264Y2 - pipe fittings - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pipe joint for high-pressure tubes, particularly in refrigeration, cooling cycles, hydraulic circuits, and the like.

Generally, flare type joints are used for this type of pipe joint.
A flared portion formed at the tip of the tube is brought into contact with the mating surface of the union, and a nut provided around the tube is tightened to the union so that the flared portion is sandwiched between the nut and the union.

However, with flare type like this,
Since the diameter of the nut is large, the torque needed to tighten it to the union is large, and a torque wrench was required after tightening.

Therefore, it has been impossible to join pipes in places where the space is so narrow that the torque wrench cannot be rotated.

Additionally, when the nut is tightened, a frictional force is generated between the nut I and the flared part, and a torsion moment is applied to the pipe, which may damage the brazed parts if there are any. However, there were drawbacks such as the pressure acting on the flared portion becoming uneven, making it impossible to expect a perfect seal.

Therefore, in order to solve the above-mentioned problem, this invention expands the vicinity of the tip of each tube to be joined to form an enlarged tube part, and the tips of the tubes are made by abutting the formed flange parts against each other.
A nipple is disposed within the expanded tube portion, an O-ring is interposed between the nipple and the tube, and the abutted flange portion is clamped by a tightening member provided around the expanded tube portion and connected with bolts. It is an object of the present invention to provide a pipe joint that can be configured so that pipes can be easily joined even in a narrow space, and that can be completely sealed.

Examples of this invention will be described below with reference to the drawings.

1 to 3, the structure of the pipe joint of this invention is shown, and the tubes 1a and 1b to be joined are tubes made of aluminum alloy or prepared alloy used, for example, in refrigeration and cooling cycles, and their tips are The surrounding area is expanded and the expanded area 2a, 2
b has been formed.

The expanded tube portions 2a, 2b are formed from tapered portions 3a, 3b that are expanded into a tapered shape, and cylindrical portions 4a, 4b that extend in the axial direction from the tapered portions 3a, 3b to the tips. Ru.

Further, at the tips of the tubes 1a and lb, a flange portion 5a,
5b are bent once in the radial direction, and are butted against each other.

The cylindrical nipple 6 is made of synthetic resin, for example, and has tapered surfaces 7a and 7b formed on both sides. It is arranged within the sections 2a and 2b.

Grooves 8a and 8b for O-rings are formed at the rear ends of the tapered surfaces 7a and 7b of the nipple 6, and O-rings 9a and 9b are accommodated in the grooves 8a and 8b.

The O-rings 9a and 9b are connected to the expanded tube portion 2a,
The tube 1 is brought into contact with the corner portions 10a, 10b formed at the boundaries between the tapered portions 3a, 3b and the cylindrical portions 4a, 4b of the tube 2b.
It is interposed between a, lb and the nipple 6.

Therefore, O-ring 9a. 9b is the corner portion 10a, 10
Since it is in contact with b, the tubes 1a of O-rings 9a and 9b,
The contact area with lb is large, so O-ring 9
The sealing force by a and 9d is increased.

A pair of fastening members 11a and llb are ring-shaped and are provided around the expanded tube portions 2a and 2b, and one female fastening member 11a is fitted with the other male fastening member 11b. At the same time, with the washers 12a and 12b in between, the pole 113a,
13b.

A recess 14a is provided at the center of the inner side of the pair of tightening members 11a and llb.

14b is formed, and the flange portions 5a, 5b of the tubes 1a, lb are axially clamped in this recess 14.

Therefore, by tightening the tightening members 11a and llb, the tube walls of the expanded tube portions 2a and 2b are tightened by the O-rings 6a and 9b.
is pressed against the inside of the tapered portions 3a, 3b in the right angle direction, so that the seal between the tubes 1a, lb and the nipple 6 is more complete.

In this embodiment, the bolts 13a and 13b are inserted into insertion holes 15a and 15b formed in the female-type tightening member 11a.
is inserted into the screw hole 16 formed in the male fastening member 11b.
a, 16b, but as another embodiment,
On the other hand, it may be screwed onto the female type fastening member 11a, or may be connected using a nut.

To join the tubes 1a and lb at the tank bottom, first insert the nipple 6 provided with the O-rings 9a and 9b into the tubes 1a and lb.
The flange portions 5a and 5b of the tubes 1a and lb are brought into contact with each other so as to be sandwiched between the expanded tube portions 2a and 2b.

Next, fit the tightening members 11a and llb into each other, and
Rotate and tighten parts a and 13b to complete.

Therefore, since the only rotating parts are the ports 113a and 13b, it is easy to work in a narrow space.

Further, since no rotational force is applied to the tubes 1a, lb, there is no risk of damage even if there are brazed parts at the other ends of the tubes 1a, lb.

As described above, according to this invention, in a pipe joint that joins pipes together, the vicinity of the ends on the joint side of the pipes is expanded to form an expanded part consisting of a tapered part and a cylindrical part, and the ends of the pipes are expanded. The flange portions formed in the flange portions are butted against each other, a nipple is arranged in the expanded tube portion, an O-ring is interposed between the nipple and the tube at the corner of the expanded tube portion, and the flange portions that have been butted are placed in the expanded tube portion. Since it is clamped with the tightening member of the connection at Port I, the contact area of the O-ring increases, and a pressing force is applied from the pipe wall to the nipple side.
Perfect sealing performance can be ensured.

In addition, when joining pipes, all you have to do is rotate the bolts, so there is no need to use a torque spanner like in the past, and you can tighten with a small torque, even in tight spaces. It's convenient.

Furthermore, since the sealing part and the tightening part are completely separated, there is no frictional force acting on the pipes or O-rings to be joined, and there is no risk of damage to the brazing parts or O-rings during joining work. It has the following effects.

[Brief explanation of the drawing]

Figures 1 to 3 show the structure of the pipe joint of this invention, with Figure 1 being a longitudinal sectional view, Figure 2 being a sectional view taken along line A-A in Figure 1, and Figure 3 being an exploded perspective view. . la, lb...tube, 2a, 2b...tube expansion part, 3a. 3b... Taper part, 4a, 4b... Cylindrical part, 5a. 5b...Flange part, 6...Nipple, 7a, 7b...Tapered surface, 9a, 9b.
...O-ring, 10a. 10b... corner, lla, llb...
- Tightening member, 13a. 13b...Bolt.

Claims (1)

[Scope of utility model registration request] A tapered part is formed by expanding the vicinity of the tip of each tube to be joined.This tapered part forms a cylindrical part that extends in the axial direction to the tip, and an enlarged tube part that is twisted. The flange portions formed in the tube are brought into contact with each other, and a cylindrical nipple having tapered surfaces on both sides is taken into the expanded tube portion, and an O-ring is inserted between the nipple and the tube. The flange portion, which is interposed at a corner of the pipe and the pipe portion and which are abutted, is axially clamped by a pair of tightening members provided around the expanded tube portion and connected with bolts. A pipe joint characterized by: