JPH0241426Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a joint structure for a hume pipe, which improves the structure of a joint having a socket for connecting hume pipes.

(Prior Art) There are various methods for connecting humid pipes with pipe joints, including methods using collars and methods using spigot joints.

Among these, joints with sockets are often used. For example, it is assembled as shown in FIG.

The outer periphery 2 of the end of the hume pipe 1 is fitted into the outer periphery 5 of the socket part 4 of the hume pipe 3 to be connected, and the outer periphery 2 of the hume pipe 1 and the inner periphery of the socket part 4 of the hume pipe 3 are connected. A seal ring 6 is inserted between the surface 5 and the surface 5.

The seal ring 6 is made of an elastic material such as rubber, and connects the hume tube 1 and the hume tube 3 in an airtight manner.

(Problem to be solved by the invention) However, in the case of the above pipe joint structure,
The seal ring 6 is attached to the outer circumference 2 of the end of the hume pipe 1.
Shallow grooves 7 and 8 into which the seal ring 6 is slightly fitted are provided in the portion that contacts the inner circumferential surface 5 of the socket portion 4 of the fume tube 3, respectively, making the seal more effective. It's starting to become.

However, when trying to insert the fume pipe 1 with the seal ring 6 attached into the socket part 4 of the fume pipe 3, the lower part of the seal ring 6 is pressed strongly due to the weight of the fume pipe 1 and does not move much. However, since the load applied to the upper part of the seal ring 6 is smaller, it moves more easily than the lower part.

Further, since the seal ring 6 is made of an elastic material, it is forced onto the walls of the hume tubes 1 and 3 for sealing, so that it is difficult to insert the seal ring 6 into a predetermined position. That is, as shown by the two-dot chain line 6a in FIG.
It often happens that the seal ring is inserted at an angle, leaving the seal ring in an incomplete state.

In such a state, the seal ring 6 has an elliptical cross-sectional shape, which reduces the sealing effect.

In this case, the seal ring 6 is connected to the shallow groove 7,
8, the sealing effect is impaired from this point as well, making it impossible to make an airtight connection.

The object of the present invention is to prevent the seal ring 6 from being inserted diagonally in this way, and to always ensure an airtight connection between the hume pipes 1 and 3.

(Means for Solving the Problem) In order to achieve the above object, the outer circumference of the end of the hume tube is fitted into the inner circumferential surface of the socket of the hume tube to be connected, and the outer circumference of the hume tube A seal ring made of an elastic material is inserted between the inner peripheral surface of the socket part of the hume pipe to be connected to airtightly connect both the hume pipes, and the seal ring is connected to the outer peripheral part of the end of the hume pipe. A shallow groove into which the seal ring is slightly fitted is provided in the contacting part or in the part contacting with the inner circumferential surface of the socket part of the fume pipe to be connected, respectively, so that the sealing becomes more effective. In the pipe joint structure for a hump pipe, a concave annular groove is provided near the opening of the inner circumferential surface of the socket portion between the opening and the shallow groove, and the inner circumferential surface of the socket portion is provided in the concave annular groove with the inner circumferential surface facing the opening. On the other hand, when an annular body of an elastic body that forms a tapered surface, has a substantially square cross section, and has a notch is compressed from the outside until both sides of the notch come into close contact, the outer diameter d ₃ of the annular body is
It is slightly smaller than the opening diameter D ₂ of the socket part,
The annular body is inserted into the annular groove and returns to its original shape when pressure from the outside is released, and at this time, the obtuse angle portion of the tapered surface of the annular body on the opening side The inner diameter d ₂ of the annular body is formed to have a circumference approximately equal to the diameter D ₂ of the opening of the socket portion, and the diameter d ₁ of the acute angle portion on the rear end side of the annular body expands. When the inner diameter _d1a of the annular body becomes equal to the diameter _D1 of the inner surface of the socket part, the outer diameter _d3 of the annular body is formed to be equal to the inner diameter _D3 of the concave annular groove. When inserting the seal ring that tightly fits into the hume pipe to be connected, the seal ring receives an average force over the entire circumference due to the tapered surface and is inserted uniformly, and the annular body The seal ring is characterized in that the minimum inner diameter _d1 is smaller than the outer diameter of the seal ring to prevent the seal ring from coming off.

(Function) With this configuration, the inner circumferential surface 5 of the socket portion 4 of the hume pipe 3 to which the hume pipe 1 to which the seal ring 6 is firmly fitted is to be connected
When inserted into the annular body 10, the seal ring 6 is uniformly inserted by receiving an average force from the annular body 10 over the entire circumference by the inclined surface of the annular body 10, and once inserted, The annular body 10 comes into contact with the seal ring 6 and is prevented from coming off.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

FIG. 1 is a partial sectional view showing the case where the end of the hume tube 1 is inserted into the socket portion 4 of the hume tube 3 to be connected.

FIG. 1 corresponds to FIG. 6, and the same members are designated by the same reference numerals. 1 is the hume tube, 2 is the outer periphery of its end, 3 is the hume tube to be connected, 4 is its socket, 5 is the inner circumferential surface of the socket, 6 is a seal ring, and 7 is a shallow hole provided in the hume tube 1. groove,
Reference numeral 8 denotes a shallow groove provided in the socket portion 4 of the hume pipe 3.

A concave annular groove 9 is provided slightly closer to the opening than a shallow groove 8 for inserting a seal ring 6 provided on the inner circumferential surface 5 of the socket portion 4 of the hume tube 3.

The cross section of this concave annular groove 9 is square as shown in FIGS. 1 and 3. As shown in FIGS. 1 and 3, an annular elastic body 10 having a substantially rectangular cross section and whose inner circumferential surface forms a tapered surface relative to the opening is inserted therein.

FIG. 2a is a plan view of the annular body 10. In FIGS. 2a and 2c, reference numeral 11 indicates a cutout portion of the annular body 10. In FIG.

FIG. 3 is an enlarged sectional view showing the dimensional relationship between the concave annular groove 9, the annular body 10, and the seal ring 6. As shown in FIG.

The annular body 10 has an inner peripheral surface tapered toward the opening. The inner diameter of the acute angle part 12 on the rear end side of the annular body 10 is d ₁ , and the obtuse angle part 1 on the opening side
The inner diameter of the portion 3 is d ₂ , the diameter of the outer surface 14 is d ₃ , and the inner diameter of the inner peripheral surface of the socket portion 4 is d 2 .
D ₁ , the inner diameter of the socket part 4 on the opening side from the concave annular groove 9 is D ₂ , and the inner diameter of the concave annular groove 9 is D ₃ ,
Form the relationship as shown below. That is, the inner diameter D ₂ of the socket part 4 on the opening side of the concave annular groove 9 is made slightly larger than the inner diameter D 1 of the inner circumferential surface ₅ of the socket part 4.
Further, the outer diameter d ₃ of the annular body 10 is fitted into the inner diameter D ₃ of the concave annular groove 9 .

That is, in order to fit into the concave annular groove 9 of the annular body 10, since the annular body 10 is an elastic body, the annular body 10 is compressed from the outside as shown by the arrow in FIG. When the annular body 10 is contracted to the point where they are in close contact with each other, the annular body 10 becomes a circular shape with an outer periphery having an outer diameter _d3a .

If the outer diameter _d3a of this annular body 10 is made slightly smaller than the opening diameter D2 of the socket part ₄ in FIG. 3, it can be fitted into the socket part 4.

Next, when the annular body 10 has been inserted to the position of the annular groove 9, when the pressure from the outside is released, the annular body 10 returns to its original shape and becomes the state shown in FIGS. 2 and 3.

At this time, the inner diameter d ₂ of the obtuse angle portion 13 of the annular body 10 is made to have a circumference approximately equal to the diameter D ₂ of the opening of the socket portion 4 .

Next, a case will be described in which the fume pipe 1 is inserted into the socket portion 4 of the fume pipe 3 and a pipe joint is connected. A seal ring 6 is fitted into the seal ring groove 7 at the end of the hump tube 1, and when the seal ring 6 approaches the socket portion 4, the diameter D ₂ of the opening becomes such that the seal ring 6 is finally fitted. Since it is slightly larger than the inner diameter _D1 of the inner peripheral surface 5 of the socket into which it is inserted, the seal ring 6 can be easily inserted into it.
It abuts against the annular body 10. The diameter d ₂ of the inlet of the annular body 10 is approximately equal to the inner diameter D ₂ of the socket opening;
Since both are circular, the seal ring 6 directly enters the inside of the annular body 10. However, as the inner diameter of the annular body 10 becomes smaller and smaller, it becomes difficult for the seal ring 6 to enter. However, since the annular body 10 is an elastic body, it is inserted into the concave annular groove 9 as shown in FIG. The seal ring 6 expands its inner diameter under tension as shown by the arrow shown in FIG. Then, the acute angle part 1 of the annular body 10
2 expands to become _{d1 a} , and when this enlarged inner diameter d1 _a becomes equal to the diameter D ₁ of the inner surface of the socket part, the outer diameter d ₃ of the annular body 10 becomes d3 _b
However, the inner diameter D ₃ of the concave annular groove 9 is set equal to this d3 _b . Then, the annular body 10
Since the inner diameter of the seal ring 6 cannot be larger than this, the resistance increases when the seal ring 6 attempts to advance inward from there. However, the inner surface of the seal ring 6 is a tapered surface, and the resistance gradually increases.
The cross section advances while undergoing contraction, passes through the annular body 10, and reaches the inner circumferential surface 5 of the socket portion 4. At this time, as in the case of the prior art, there is a tendency that the downward load is large and the load applied to the upper part of the seal ring 6 is slightly smaller; The force is averaged over the circumference, and the distance traveled is short, so the upper part is not left behind as in the conventional case. The seal ring 6 is attached to the socket part 4
When reaching the inner circumferential surface 5 of the seal ring 6, there is a shallow groove 8 there, so the seal ring 6 is inserted into the shallow groove 8.

Further, after the seal ring 6 passes the annular body 10, the expanded annular body 10 is moved to the second position.
It will return to its original shape as shown in Figure a.

Therefore, since the minimum inner diameter d ₁ of the annular body 10 is smaller than the outer diameter of the seal ring 6, it acts as a stopper and prevents the seal ring 6 from coming off.

Therefore, the Huum's canal 1 is the Huum's canal 3.
The tube is securely inserted into the socket portion 4 of the tube, and an airtight connection of the hume tube is made.

(Effects of the invention) Since the present invention has the above-described structure and function, the seal ring is not inserted diagonally, and the hume pipe is always connected in an airtight manner. Connection by the socket method is made more reliably, which not only improves the workability of connecting fume pipes, but also eliminates troubles such as leakage and reduces maintenance costs.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional view showing the state when the Huum tube of the present invention is connected, Fig. 2 a, b, and c are explanatory diagrams showing the shape of the annular body, and Fig. 3 is the annular body of Fig. 1. 4 is a plan view showing the case where the annular body is compressed, FIG. 5 is a plan view showing the case where the annular body is expanded, and FIG. FIG. 1, 3... Huyum's canal, 2... Outer periphery, 4...
Socket portion, 5...Inner peripheral surface, 6...Seal ring, 7...Shallow groove, 8...Shallow groove, 9...Concave annular groove, 10...Annular body.

Claims (1)

[Claims for Utility Model Registration] The outer circumference of the end of the hume tube is fitted into the inner circumferential surface of the socket of the hume tube to be connected, and the outer circumference of the hume tube is connected to the socket of the hume tube to be connected. A seal ring made of an elastic material is inserted between the inner circumferential surface of the end of the hume tube to airtightly connect the two hume tubes, and the seal ring is in contact with the outer circumference of the end of the hume tube or the portion where the connection is to be made. A joint structure for a hume pipe in which shallow grooves into which the seal rings are slightly fitted are provided in the portions that contact the inner circumferential surface of the socket portion of the hume pipe to make the seal more effective, A concave annular groove is provided near the opening on the inner peripheral surface of the socket portion between the opening and the shallow groove, and the concave annular groove has a cross section in which the inner peripheral surface forms a tapered surface with respect to the opening. When a rectangular elastic annular body having a notch is compressed from the outside until both sides of the notch come into close contact, the outer diameter d ₃ of the annular body is
It is slightly smaller than the opening diameter D ₂ of the socket part,
The annular body is inserted into the annular groove and returns to its original shape when pressure from the outside is released, and at this time, the obtuse angle portion of the tapered surface of the annular body on the opening side The annular body is formed so that its inner diameter d ₂ is approximately equal to the diameter D ₂ of the opening of the socket portion, and the diameter d ₁ of the acute angle portion on the rear end side of the annular body expands. When the inner diameter _d1a of the annular body becomes equal to the diameter _D1 of the inner surface of the socket part, the outer diameter _d3 of the annular body is formed to be equal to the inner diameter _D3 of the concave annular groove. When inserting the seal ring that tightly fits into the hume pipe to be connected, the seal ring receives an average force over the entire circumference due to the tapered surface and is inserted uniformly, and the annular body A pipe joint structure for a hume pipe, characterized in that the minimum inner diameter _d1 is smaller than the outer diameter of the seal ring to prevent the seal ring from coming off.