JPH0650481A - Vacuum pipe fitting - Google Patents

Abstract

PURPOSE:To provide a vacuum pipe fitting which can exhibit a suitable fastening force, which can reduce the number of components while shorten the time of the assembly thereof. CONSTITUTION:In order to stop the insertion of a hard tube 2 into a rubber fitting body 11 at a predetermined depth, a step part 12 is formed in the fitting part 11, and the inner diameter of the insertion part of the fitting part 11 which terminates at the step part 11, is made to be slightly small than the outer diameter of the hard tube 2. With this arrangement, a suitable fastening force can be obtained only by inserting the hard tube 2 into the fitting body 11, and accordingly, it is possible to reduce the number components and to shorten the time of the assembly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum piping joint for vacuum piping using a hard tube or the like.

[0002]

2. Description of the Related Art In a conventional vacuum piping joint, for example, as shown in FIG. 2, when a hard tube 2 is connected to a metal joint body 1 by tightening a nut 3, the nut 3 and the outer surface of the tube 2 are joined together. And a sleeve 4 having a slight thickness at the tip and formed at an acute angle. In the figure, 5 is an insert extending from the main body 1.

In the procedure of connecting as described above, first, the nut 3 is passed through the hard tube 2, and then the sleeve 4 is inserted. Next, the tube 2 in which the nut 3 and the sleeve 4 have already been assembled is inserted into the insert 5 and the nut 3 is tightened. As a result, the sleeve 4 does not easily fit into the hard tube 2 and gas leakage through the hard tube 2 and the joint body 1 can be prevented.

[0004]

The above-mentioned conventional structure has the following problems. That is, since the sleeve 4 is used, the rigid tube 2 is indirectly tightened, which increases the number of parts. Further, since the nut 3 is used for tightening, there is a problem that a tool is required and assembly time is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems, to provide an appropriate tightening force, to reduce the number of parts, and to provide a vacuum pipe joint which can shorten assembly time.

[0006]

In order to achieve the above object, the present invention provides a vacuum piping joint in which the inner diameter of a rubber main body portion into which a hard tube is inserted is slightly smaller than the outer diameter of the hard tube. It is characterized by having done.

[0007]

In the vacuum pipe joint, when the hard tube is inserted into the rubber joint body, the inner diameter of the joint body is slightly smaller than the outer diameter of the hard tube. As it is inserted, the hard tube is tightened by the elastic force of the joint body, and an appropriate tightening force is obtained by this, so not only the sealing action of the fluid passing through the pipe is secured, but also the number of parts And the assembly time can be shortened.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a side view showing a vacuum pipe joint according to an embodiment of the present invention with a part thereof cut away. In the figure, the same reference numerals as those shown in FIG. 2 indicate the same or similar parts.

In the figure, reference numeral 11 denotes an L-shaped rubber joint body, and a tube step portion 12 is formed in the joint body 11 to stop the insertion of the hard tube 2 at an appropriate depth. The inner diameter of the insertion portion of the rubber joint body 11 that ends at the tube mounting portion 12 is equal to that of the hard tube 2
Is formed to be slightly smaller than the outer diameter of.

Since the joint body 11 is made of rubber, it has some elasticity, and the inner diameter of the joint body 11 is slightly smaller than the outer diameter of the hard tube 2 to be inserted. Therefore, an appropriate tightening force can be obtained simply by inserting the hard tube 2 into the joint body 11, and the number of parts and the assembling time can be shortened.

In the above embodiment, the structure in which the joint main body 11 is formed in the L-shape has been described, but the present invention is not limited to this. For example, the joint main body is formed in the T-shape, and three joints are formed. A rigid tube may be connectable. Also, the angle can be considered to be 0 to 90 degrees even in the L-shape.

[0012]

As described above, according to the present invention,
In the vacuum pipe joint, the inner diameter of the rubber main body part into which the hard tube is inserted is made slightly smaller than the outer diameter of the hard tube, so that the proper tightening force can be obtained simply by inserting the hard tube into the joint body. Therefore, not only the sealing effect of the fluid passing through the pipe can be secured, but also the number of parts and the assembling time can be shortened.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the present invention and is a side view showing a vacuum pipe joint with a part thereof cut away.

FIG. 2 is a side view showing a conventional example in which a vacuum pipe joint is partially cut away.

[Explanation of symbols]

 2 Hard tube 11 Rubber joint body 12 Tube step

Claims (1)

[Claims] 1. A vacuum piping joint, wherein in a vacuum piping joint using a hard tube or the like, an inner diameter of a rubber main body portion into which the hard tube is inserted is formed to be slightly smaller than an outer diameter of the hard tube.