JPH04113092A - Tube coupling - Google Patents

Abstract

PURPOSE:To uniformly and firmly fasten a pipe over the circumferential direction by forming a protruding part on a flange or V-channel, in tube coupling for mutually connecting pipes in their flange surfaces and fastening them by the clamp member having the V-channel. CONSTITUTION:In coupling, simple flat flanges 2a, 2b are provided on an upper pipe 1a and a lower pipe 1b, respectively. The flanges 2a, 2b of the pipes 1b, 1b are fastened by clamp members 4a, 4b. The clamp members 4a, 4b have V-channels 6. The V-channels 6 of the clamp members 4a, 4b are certainly connected to the pipe flanges 2a, 2b through a protruding part 17. Consequently, the flange can be uniformly fastened in the circumferential direction, and a plurality of pipes can be certainly and airtightly connected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pipe coupling for airtightly connecting at least two pipes.

[Prior Art] The need to connect two pipes together in an airtight manner is required in various fields. Additionally, various pipe couplings have been proposed as devices for realizing this.

For example, FIG. 6 shows an example of a conventional coupling. This coupling provides simple flat flanges 2a and 2b on each of the upper tube 1a and the lower tube 1b, and after joining them together, the flanges 2a and 2b are tightened with a large number of bolts 3, thereby The purpose is to connect both tubes 1a and 1b in an airtight manner. However, this method has the problem that a reliable connection cannot be obtained unless a large number of bolts are uniformly tightened.

Another example of a conventional coupling is shown in FIG.

This coupling uses a clamping device 4 to avoid the hassle of having to tighten a large number of bolts.
Both tubes 1a and 1b are connected using a. The clamp device 4 includes two semicircular clamp members 4a.
and 4b, whose left ends are rotatably hinged, and whose right ends are provided with fastening means 5 such as bolts, nuts, etc. 318 on the inner periphery of the clamp members 4a and 4b.
As shown in the figure, the V groove 6 is narrowed.

When connecting both pipes 1a and lb using the clamp device 4, as shown in FIG.
and 2b, and in this fitted state, the fastening means 5 shown in FIG. 7 is tightened.

This connects and fixes both pipe flanges 2a and 2b. In addition, in FIG. 9, the reference numeral 7 is a so-called O-ring.

In the conventional pipe clamps shown in FIGS. 7 to 9, the joint surfaces of the pipe flanges 2a and 2b and the V-groove 6 of the clamp member are inclined surfaces, and as the fastening means 5 is tightened, the flange It is devised so that 2a and 2b are tightly tightened. However, in this case, the joining inclined surfaces between the V groove 6 and the pipe flanges 2a, 2b are simply straight planes, and therefore, if the inclinations of both inclined surfaces do not exactly match over the entire circumference, both inclined surfaces As a result, uniform tightening over the entire circumference of the pipe flange cannot be achieved, and the tightening force is weak.

FIG. 10 shows yet another example of the conventional pipe coupling. This coupling is known as a so-called chain-type coupling, in which a plurality of clamp members 8 are rotatably fitted loosely onto a connecting plate 9 via a pin 10, and further connected in a chain. This uses a clamping device 14 formed by.

Each clamp member 8 is provided with a groove 6 as shown in FIG. A locking plate 11 having a recess 13 is provided at the left end of the clamping device 14, while a rod 15, a cylindrical stop member 16 that loosely fits into the rod, and a locking plate 11 provided at the right end thereof. A fastening knob 12 screwed to the tip of the rod 15 is provided.

When connecting both pipes 1a and 1b using this clamp device 14, first, each clamp member 8 is applied annularly along the outer periphery of the pipe flanges 2a and 2b, and the V groove 6 of the clamp member 8 is inserted into the pipe flange. 2a and 2b. When the clamping device 14 is set in an annular manner around the pipe flanges 2a, 2b, the right clamping device 1tglllcvli-shaped stop member 16 fits into the locking plate recess 13 on the left end side of the clamping device, as shown in FIG. When the fastening knob 12 is tightened in this state, the stop member 16 is pressed into the lock plate recess 13, and the diameter of the clamp device 14 is narrowed. As a result, the V-groove 6 of each clamp member 8 deeply penetrates into the pipe flanges 2a and 2b to connect the two pipes 1a and 1b.

However, in this chain type coupling as well, conventionally, the joining slope surfaces between the V groove 6 and the pipe flanges 2a, 2b were simply straight planes, and therefore, it was similar to the previous conventional example shown in Fig. 317. and tube 7 langes 2a and 2b
There was a problem in that the tightening was uneven in the circumferential direction and the fastening force was weak.

[Problems to be Solved by the Invention] As described above, pipe couplings that connect a plurality of pipes with a simple operation using a clamping device 4°14 equipped with a groove have already been known. As mentioned above, this type of coupling has problems such as uneven tightening in the circumferential direction and weak tightening force.

The present invention was made in view of the above-mentioned problems with conventional pipe couplings, and an object of the present invention is to provide a pipe coupling that can uniformly and firmly tighten a plurality of pipes in the circumferential direction. shall be.

[Means for Solving the Problems] In order to achieve the above object, the pipe coupling according to the present invention connects a plurality of pipes each having flanges at their flange surfaces, and A pipe coupling that connects a plurality of pipes to each other by tightening their flanges. It is characterized by being formed along the direction.

It is possible to freely select whether the protrusion is provided on the 7-lunge or the V-groove of the clamp member.

The shape of the convex portion can be various shapes such as a curved protrusion having a circular arc shape or a protrusion having a mountain-shaped cross section.

Furthermore, the protrusions may be provided uniformly around the entire circumference of the flange or V-groove, or may be provided intermittently in the circumferential direction at appropriate intervals.

[Operation] The two pipes (1a, 1b) to be joined are connected with the flanges (2a, 2b) and the V-groove (6) of the clamp member being joined to each other. Since a convex portion protruding toward the other is formed on one of these joining surfaces in the circumferential direction, the joining surfaces are reliably joined to each other in the circumferential direction. Therefore, the two flanges can be tightened uniformly and firmly in the circumferential direction.

[Example J1] - Fig. 1 shows an example in which the present invention is applied to the type of pipe compulsion shown in Fig. 7, and corresponds to the part shown in Fig. 8. There is.

This embodiment differs from conventional couplings in that V-grooves 6 provided in clamp members 4a and 4b
The groove wall forming the groove has a convex portion 17 that is curved in an arc shape and protrudes as shown in Figure 1, instead of being an inclined surface consisting of a simple straight plane as shown in Figure 8. It is.

When the pipe flanges 2a and 2b are tied together using the clamp members 4a and 4b, as shown in FIG. to ensure a secure connection. In this case, since the convex portion 17 is provided over the circumferential direction of the clamp members 4a and 4b, the V-groove 6 and the pipe flanges 2a and 2
The bonding with b is also performed reliably over their circumferential direction.

As a result, the pipe flanges 2a and 2b are tightened uniformly in the circumferential direction, achieving an airtight connection between the pipes 1a and 1b.

Mitate 2 FIG. 3 shows an embodiment in which the present invention is applied to the so-called chain-type pipe coupling shown in FIG. 10, and corresponds to the part shown in FIG. 11.

In this embodiment, the V-groove 6 of each clamp member 8 constituting the clamp device 14 is provided with an arcuate curved convex portion 17 similar to that of the first embodiment described above. Therefore,
As in the case of Example 1, the clamp member V groove 6 and the pipe flanges 2a and 2b are joined uniformly over the circumferential direction, and therefore the pipes 1a and 1b are connected uniformly and airtight over the circumferential direction. be able to.

Sougohan 1 Figures 1 and 4 show an example that is a modification of Example 1 shown in Figure 111. In this embodiment, the convex portions 17 provided on the groove wall of the groove 6 are not formed all around the clamp members 4Δ and 4b, but are formed intermittently at appropriate intervals. There is. Even when the convex portions 17 are arranged intermittently in this way, the pipe flanges 2a and 2
b can be tightened uniformly over the circumferential direction.

The present invention has been explained above by giving several examples, but
The invention is not limited to these examples.

For example, the convex portion 17 may be provided on the clamp members 8, 4a, and 4b as in each of the above embodiments, or may be provided on the pipe flanges 2a and 2b.

The shape of the convex portion 17 may be a protrusion curved in an arc shape as in each of the above embodiments, or a protrusion having a mountain-shaped cross section as shown in FIG.

[Effects of the Invention] According to the present invention, since a convex portion is provided in the circumferential direction on either the V-groove of the clamp member or the seven flanges that fit therein, the joint surface of the two is changed from a mere straight plane. Compared to the conventional case where the flange had a sloped surface, the flange can be tightened uniformly in the circumferential direction, making it possible to reliably connect multiple pipes airtightly.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing one embodiment of the clamp member used in the pipe coupling according to the present invention, FIG. A partially cutaway perspective view showing another embodiment, 114
The figure is a partially cutaway perspective view showing still another embodiment of the clamp member, FIG. 5 is a sectional view showing still another embodiment of the clamp member, and FIGS. 6 to 12 are conventional pipe couplings and their FIG. la, lb-pipe, 2a, 2b = pipe flange. 4a, 4b, 8... Clamp member, 6... V-groove of clamp member, 17... Convex portion Fig. 3 Clamp member No. 2 1b Pipe Fig. 5 Fig. 6 Fig. 7 Fig. b Fig. 8 Fig. 9 Figure b Figure 10

Claims (1)

[Claims] A pipe coupling that connects a plurality of pipes with each other by joining a plurality of flanged pipes at their flange surfaces and tightening the flanges with a clamp member having a V-groove. A pipe coupling characterized in that a convex portion protruding toward the other is formed along the circumferential direction of either the flanges or the V-groove.