JPS6317918Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pipe joint for connecting comparatively thin non-ferrous pipes used in, for example, refrigerators.

Conventionally, a pipe joint as illustrated in FIG. 1 has been known. This pipe joint is formed from a plastically deformable metal joint body 1 and a pair of metal fastening rings 2, 2. In addition, 3 and 3 in FIG. 1 are pipes to be connected. The joint body 1 has a stopper part 4 in the center and plastically deformed parts 5, 5 on both sides, and the tightening rings 2, 2 have a tapered inner surface 6.

This pipe joint has pipes 3, 3 into which the tightening ring body 2 is loosely fitted.
After applying an adhesive sealant to the outer periphery of the tip and fitting the tip into the joint body 1 (see the state on the left side in Fig. 1), the tightening rings 2 are attached to the stopper 4.
By tightening the pipes 3, 3 until they hit, the plastically deformed parts 5, 5 are deformed by the tapered inner surface 6 (see the state on the right side in FIG. 1), and the pipes 3, 3 are connected.

By the way, according to this pipe joint, it is necessary to apply a connection sealant upon connection, and the tightening rings 2, 2 are tightened using a specially prepared manual tightening tool. However, there was a drawback that the connection work was time-consuming. Moreover, since the joint body 1 is plastically deformed, all parts are limited to metal, which is heavy and causes high cost.

Therefore, the object of the present invention is to provide a pipe joint that allows pipe connection work to be performed with great ease, improves air-tightness or liquid-tightness, and, if necessary, reduces weight and cost. Our goal is to provide the following.

That is, to explain the outline of the present invention, an elastic seal cylinder is housed in a joint body having opposing insertion ports and a through hole connecting these, and is supported by the inner peripheral surface of the through hole. has an opening with a diameter smaller than the diameter of the insertion port at both ends thereof, and is provided with a seal ring portion whose wall thickness tapers toward the opening, and whose thickness changes in a tapered manner,
A retaining body is provided in the joint body on both sides of the elastic seal cylinder, and each of these retaining bodies has a plurality of locks that are inclined toward the seal ring and whose opening diameter at the inclined end is smaller than the diameter of the insertion port. This is a pipe joint characterized by having a piece.

According to this feature, by simply inserting the tip of the tube into the insertion port, the tip of the tube pushes open the locking piece and is closely connected to the seal ring.
In this connection, the locking piece bites into the outer circumferential surface of the pipe, and this locking becomes stronger as more force is applied to the pipe in the direction of withdrawal, so that the pipe does not come off accidentally and can be used over a certain level. Bond strength can be obtained. At the same time, by bringing the seal ring portion into close contact with the outer periphery of the pipe, it can be made airtight or liquid-tight. In this way, there is no need to apply adhesive sealant for connection, and there is no need to prepare a special manual tightening tool, so a secure connection can be made with the simple operation of simply inserting the pipe. . Further, since the tightness of the seal ring portion to the pipe becomes stronger as the internal pressure of the elastic seal cylinder increases, sealing performance can also be improved. In addition, since there is no need for plastic deformation during connection,
The material of the component parts is not limited to metal, but can be made of synthetic resin if necessary, and in this case, weight and cost can be reduced.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 5.

In the figure, reference numeral 11 denotes a joint body, which in this embodiment is formed from a main body main part 13 having a through hole 12, and lid parts 14, 14 screwed onto both ends of this main part 13, respectively. Opposing insertion ports 15 are formed in the lid portions 14, 14, respectively. Diameter A of through hole 12
is larger than the diameter B of the insertion port 15,
In addition, the diameter B of the insertion port is slightly larger than the outer diameter of a pipe to be connected, for example, a relatively thin non-ferrous pipe 16 for a refrigerator. In this embodiment, the main body portion 13 and the lid portions 14, 14 are made of hard synthetic resin in order to reduce weight and cost.

An elastic seal cylinder 17 is housed within the joint body 11 and supported by the inner peripheral surface of the through hole 12 . Seal rings 1 are provided at both ends of the elastic seal cylinder 17, respectively.
8, 18 are integrally formed, and this ring portion 18, 18
has an opening having a diameter C smaller than the diameter B of the insertion port 15, and has a structure in which the wall thickness tapers toward the opening. In addition, since the seal cylinder 17 is connected to the refrigerator pipe 16 in this embodiment,
Made of silicone rubber with excellent heat and cold resistance. Further, reference numeral 19 in the figure is a stopper ring made of brass or the like provided as necessary to stop the insertion of the tube 16 in a fixed position, and is attached to the inner surface of the elastic seal cylinder 17 by adhesive or the like.

Furthermore, an elastic seal cylinder 17 is provided inside the joint body 11.
Retainer bodies 20, 20 are housed on both sides of the housing, respectively. The retaining bodies 20, 20 are made of metal, and are retaining rings having a plurality of locking pieces 21 that are inclined toward the seal ring portion 18 and whose inclined end opening diameter D is smaller than the diameter B of the insertion port 15. It is. The retaining bodies 20, 20 are the main body main part 13 and the lid part 1, respectively.
It is sandwiched between 4 parts. Moreover, in this embodiment, the locking piece 21 is brought into contact with or close to the outer surface of the seal ring 18, and directly suppresses the expansion of the ring 18.

To connect the pipes 16, 16 with the pipe joint of the above structure, it is only necessary to manually insert the end of the pipe 16 from the insertion port 15, and the pipe 16 comes into contact with the stopper ring 19 as shown in Fig. 2. until it is inserted into place.
In this state, the locking piece 21 is pushed open toward the seal ring portion 18 and is elastically deformed, so that the tip of the locking piece 21 bites into the tube 16 and prevents the tube 16 from coming off. In the same state, the opening edge of the seal ring 18 is rolled up in the insertion direction of the tube 16 and brought into close contact with the outer peripheral surface of the tube 16, so that airtightness or liquidtightness is maintained.
Moreover, when the internal pressure of the elastic seal tube 17 increases, this internal pressure acts in the direction of the arrow in FIG. 2 in a direction that presses the curved portion of the seal ring 18 against the tube 17, further improving the sealing performance. In this case, the possibility of a gap being formed between the seal ring portion 18 and the pipe 16 is prevented by the restraint of the retaining body 20.

In addition, in the present invention, the joint body 11 has a main body part 13' which is cylindrical with a bottom and has one insertion port 15 at the bottom, as in the other embodiment shown in FIG.
It may be formed with a lid part 14 screwed into the opening of the main part 13', thereby reducing the number of parts.
Further, as shown in this embodiment, the retaining body 20 need only be housed in the through hole 12 and does not need to be specially fixed. However, in this case, it is desirable to provide a flange 20a on the outer peripheral edge of the retainer 20 to prevent it from falling, and to support this on the inner peripheral surface of the through hole 12. The structure of each part other than the above structure is the same as that of the above embodiment. Of course, it goes without saying that the intended purpose of the present invention can also be achieved with other embodiments.

Further, in the present invention, the retaining body 20 may have a partially broken structure (not a ring), or may be provided by adhering to the lid portion 14, the seal ring portion 18, etc. in advance. Further, in both of the above embodiments, the retaining body 20 has a structure in which the seal ring portion 18 is directly restrained, but an intermediate ring may be interposed to restrain the seal ring portion 18 indirectly. Furthermore, a configuration may be adopted in which a retaining ring is provided so that the retaining body 20 does not take part in restraining the seal ring portion 18. The pipe 16 to be connected may be made of metal, and the pipes 16, 1
6 have different diameters, the insertion ports 15, 15 may be formed to have matching diameters. In addition, the joint body 1
1 may be made of metal. In addition, when implementing the present invention, unless it is contrary to the gist of the invention, the joint body, insertion port, through hole, elastic seal cylinder, seal ring,
It goes without saying that the specific structure, shape, position, material, etc. of the retainer, the locking piece, etc. are not limited to those of the above embodiments, and can be configured and implemented in various ways.

Since the present invention described above has the configuration described in the above-mentioned utility model registration claim, there is no need to prepare a special manual tightening tool, and the operation is extremely simple, such as simply inserting the pipe. It has practical effects such as reliable connection, improved airtightness or liquidtightness, and reduction in weight and cost if necessary.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a conventional example, and Figures 2 to 5
The figures show one embodiment of the present invention, Fig. 2 is a sectional view of the device in use, Fig. 3 is a sectional view, Fig. 4 is an exploded sectional view, Fig. 5 is a front view of the retaining body, and Fig. 6 is a sectional view of the device. FIG. 3 is a sectional view showing another embodiment of the present invention. 11...Joint body, 12...Through hole, 15...Inlet, 16...Pipe, 17...Elastic seal cylinder, 18
... Seal ring portion, 20 ... Removal prevention body, 21 ... Locking piece.

Claims (1)

[Scope of Claim for Utility Model Registration] A joint body that has opposing outlets on both sides and a through hole that connects the two outlets and has a diameter larger than the diameter of the two outlets, and the above-mentioned through hole. A seal ring portion is supported on the inner circumferential surface and housed in the joint body, has an opening smaller in diameter than the diameter of the insertion port, and has a wall thickness tapered toward the opening. an elastic seal tube formed in each of the above, and an elastic seal tube that is housed in the joint body on both sides of the elastic seal tube, and is inclined toward the seal ring so that the opening diameter of the inclined end is larger than the diameter of the insertion port. A pipe fitting comprising: a retaining body having a plurality of small locking pieces;