JPS62113988A - Fluid pipe joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fluid pipe joint, and more specifically, the present invention relates to a joint for a fluid pipe, and more specifically, it is interposed between a socket part and an insertion part of a fluid pipe and has a self-sealing effect. The present invention relates to a structure of a joint portion having a packing that exhibits the following properties.

[Conventional technology] Looking at conventional joints, the mechanical joint shown in FIG.
and into the inlet tube 110, and insert the inlet tube 11 into the outlet tube 100.
0 is inserted, the packing 130 is pushed in with the press ring 120 to seal the joint, so handling at the time of connection is simple, just tightening the port 140, and there is no need to chamfer the end of the insertion tube. Although there are advantages such as no sealing, there is a disadvantage that the sealing effect is gradually lost due to deterioration of the roughtance of the pressed par and king glue.

In addition, since this mechanical joint is strongly tightened by a press ring, both the socket pipe and the insertion pipe must be rigid pipes, which also has the disadvantage that its uses are limited.

On the other hand, the socket joint that holds the packing 220 inside the socket part 200 shown in FIG. 222 (so-called valve part) is accommodated in the space of the socket part 200 with ample space, and the sealing effect of the connecting rod part is achieved by the packing 220 when water pressure is applied within the spare space between the socket part 200 and the insertion part 210. The seal deforms, and due to the so-called self-sealing effect of packing, the more water pressure is applied, the more it adheres to the inner circumferential surface of the socket and the outer circumferential surface of the socket, achieving a good water-stopping effect.

Moreover, since there is no undue stress over a long period of time, it does not deteriorate, and has a sealing effect superior to mechanical joints.

However, with socket joints that hold this type of self-sealing packing, when inserting the socket, the end of the socket tube must be It is necessary to chamfer 21 steps, which poses manufacturing difficulties. In addition, when inserting the receptacle into the receptacle, it is necessary to accurately center the two, which requires a special centering tool.

[Prior Art] Therefore, the present inventor proposed the pipe joint disclosed in Japanese Patent Publication No. 59-28797 (No. (See Figure 6(c)).

In other words, "the tapered surface 302 and the valve part contact surface 302 from the outer end
a socket part 300 formed on the inner surface; an insertion part 310 inserted into the socket part 300; and a socket part 310 that engages with the socket part 300 via a fastener 340, and a tapered surface of the socket part. Arm part 3 that goes into 301
The length of 21 is substantially equal to the distance from the outer end of the socket to the back of the tapered surface 301, and the diameter of the outer periphery of the tip of the arm 321 is substantially equal to the minimum diameter of the tapered surface of the socket. and a press ring 320 having a collar 322 on the outside of the end surface of the arm portion, which is gripped by the end surface of the arm portion 321 of the press ring 320 and the collar 322, and is held by the valve portion abutment surface 302 of the socket portion. A pipe joint comprising a packing, 330, housed within the pipe joint.'' However, this prior art pipe joint has the following unique effects.

■ After depositing the push ring and packing in advance at the time of connection,
Since it is carried out using the so-called mechanical joint procedure in which a push ring is pushed in, there is no costly chamfering, which is an advantage of mechanical joints, and the connection operation is simple.

In addition, strong tightening like mechanical joints is not required.

■ The packing is accommodated in the valve housing space of the socket with plenty of room, so there is no deterioration of the packing.
Due to the self-sealing effect, it can adhere not only to joints of rigid pipes such as cast iron pipes, but also to joints of soft pipes such as synthetic resin pipes and steel pipes, which are easily flexible, by water pressure, so it can achieve an excellent water-stopping effect.

(2) The tapered surface formed on the socket allows the packing to be smoothly guided into the inside of the socket and, ultimately, into the valve housing space. Furthermore, the tapered surface has the effect of automatically centering the press ring when the front end of the press ring collides with it.

However, the tapered surface at the front end of the socket in the prior art poses a difficulty in forming and restricts pipe applications. That is, although forming a tapered surface is easy in forming cast iron pipes, it is difficult in other forms (for example, pipe end processing of steel pipes).

[Object of the present invention] The present invention has been made in view of this point, and eliminates the taper processing of the end of the socket part while taking advantage of the advantages of the prior art, thereby overcoming the constraints of cast iron forming. The aim (technical issue) is to be able to form even common materials such as steel pipes.

[Configuration of the present invention] In order to achieve the above object, the fluid pipe joint of the present invention adopts the following configuration (technical means). Namely, (1) a socket portion having a packing accommodation space formed by an inner circumferential side wall and an inner vertical wall; (2) a socket portion to be inserted into the socket; and (2) an inner diameter of the socket portion in the naturally inclined state. A solid annular packing having a smaller diameter than the outer diameter with a crushing allowance and whose outer diameter is substantially equal to the diameter of the inner circumferential side wall of the socket; The packing is abutted against the inner vertical wall, and the tightening operation closes the packing accommodation space in the fixed position, and the tightening operation brings the front end surface of the packing into contact with the inner vertical wall by tightening the tool, and the outer end surface of the packing is brought into contact with the inner vertical wall. A press ring having a puffing pressing tip surface that is brought into contact with the inner circumferential side wall to be deformed under pressure and maintains a distance to the inner vertical wall that is smaller than the width of the packing; Features.

[Function] By adopting the above configuration, during the connection operation, the outer diameter of the packing inserted into the socket is substantially the same as the inner diameter of the circumferential side walls on both sides of the socket, so there is no resistance at all. It is smoothly accommodated in the receptacle without any problems. Then, by pressing the push ring, the inclined packing can easily stand up.
Its outer diameter is enlarged and it is pressed against the inner vertical wall and inner circumferential side wall of the socket part to achieve a sealing effect.

When fluid pressure is applied to the connected joints, the outer and inner parts of the packing exhibit a self-sealing action, providing an effective water-sealing action.

[Effect J] The spliced rod structure of the present invention has the above-mentioned configuration and functions, and therefore has the following unique effects.

■ The puffing according to the present invention has an outer diameter that is substantially equal to the diameter of the inner circumferential side wall of the socket, so it is loosely inserted into the socket, and the packing can be moved into the socket by simply pushing it lightly with the push ring. is smoothly pushed into the packing accommodation space. Therefore, there is no need to perform taper processing on the socket, making it much easier to form the ends of cast iron pipes, as well as making it possible to form steel pipes, making the cutter structure suitable for large-diameter pipes. give.

- Except for the packing, the members constituting the single joint have a simple structure and are therefore easy to mold.

In particular, it is possible to use a flat press ring, which is formed from a steel plate, and which can be easily manufactured in various nominal diameter sizes, and can reduce manufacturing costs.

■ When the packing according to the present invention is compressed by the tip end surface of the press ring and the vertical wall of the inner surface of the socket, it rises from its natural inclined state, expands in the radial direction of the pipe, and receives the outer and inner surfaces in the radial direction. Strongly adheres to the inner circumferential side wall of the mouth and exhibits excellent sealing effects.

■ The tightening is in place, and the packing has sufficient elasticity in the direction of the pipe axis, so it has a self-sealing effect against the fluid pressure inside the fluid pipe, and the more water pressure is applied, the more the packing tightens in the pipe diameter. It deforms in this direction, increasing the water-stopping effect. Therefore, no undue stress is generated on the packing, and there is no deterioration of the packing.

■ At the time of connection, the push ring and packing are attached to the insertion port in advance, and then the push ring is pushed in, which is a so-called mechanical joint procedure, so the advantage of mechanical joints is that the time-consuming chamfering of the connecting pipe ends can be omitted. can.

[Mode of implementation] The joint structure of the present invention takes the following embodiments.

(2) The packing has a double-headed cross section. According to this aspect, the constriction increases the flexibility of the entire packing, and the bulges on the inner and outer diameters have an effective self-sealing effect.

[Example] Embodiments of the present invention will be described below based on the drawings.

1 to 4 show an embodiment of the structure of the joint portion of the present invention.

FIG. 1 shows the tightened joint in the normal position.

Here, l is the socket at the end of one of the fluid pipes H to be connected. A flange 2 is formed outside the end of the socket 1 . Reference numeral 2a designates an appropriate number of port insertion holes drilled in the circumferential direction of the collar 2.

An inner circumferential side wall 3 and an inner vertical wall 4 are provided on the inner surface of the socket 1 from the outer end, and a space surrounded by these walls 3.4 forms a packing accommodation space 5.

7 is an insertion port at the end of the other fluid pipe to be connected.

Reference numeral 7a designates the end face of the insertion port 7, which is not chamfered.

Reference numeral 9 denotes an annular and flat pressing ring, on the inner front end surface of which a packing pressing tip surface 10 is formed. Reference numeral 9a denotes a port insertion hole bored in the outer part of the press ring 9 in correspondence with the port insertion hole 2a of the seven flange 2.

Reference numeral 11 denotes a tightening tool for tightening the push ring 9, which is composed of a port 12 and a nib 13. The port 12 is inserted into the port insertion holes 2a and 9 of the collar 2 of the socket 1 and the push ring 9, respectively.
a, and engages the bolt head 12a with the outer surface of the collar 2 and the socket l. The press ring 9 is advanced toward the socket l by tightening the pin 13 screwed onto the pin 12.

Reference numeral 15 denotes a solid annular packing interposed in the gap between the socket l and the socket 7, and has a so-called double-headed (or cocoon-shaped) cross section. 15a is an inward bulge of the packing 15, 15b is an outward bulge, and 15c is a constriction of both bulges.

Then, the packing 15 is in its natural state with the outwardly bulging portion 15
b assumes a tilted state in which it falls forward.

The inner and outer diameters and widths of the packing 15 are specifically determined in relation to the receptacle 1 and the receptacle 7.

The dimensional relationship is shown in FIG. 2, where dl is the inner diameter of the packing 15 and d2 is the outer diameter of the packing 15.

b is the width of the packing 15, and 01 is the outer diameter of the insertion port 7.

D2 is the inner diameter of the packing accommodating space 5 of the socket 2, 1 is the depth of the packing accommodating space 5 of the socket 2, and α is the inclination angle of the packing 15.

Therefore, the inner diameter (di) of the packing 15 is smaller than the outer diameter (Dl) of the socket 7, including the crushing allowance, and the outer diameter (d2) of the packing 15 is the inner diameter (D2) of the socket 2. ) or has a slightly smaller diameter. Moreover, the width (b) of the packing 15 is made larger than the depth (text) of the packing accommodation space 5 of the socket part 2. Further, the inclination angle (α) of the packing 15 is approximately 45″.

In particular, the characteristic structure of the present invention is such that the packing 15 loaded in the packing accommodation space 5 of the socket l is pressed by the tip end face 10 of the push ring, and the packing 15 is pressed between the packing 15 and the inner vertical wall 4 of the socket l. The width in the natural state is compressed to take the most effective sealing position.

Next, these connections will be explained based on the connection procedure shown in FIGS. 3 and 4.

(1) For connection, press ring 9 and packing 15 are attached to insertion port 7.
(See Figure 3).

(2) Insert the socket 7 into the socket 1. Packing 15
Since it is substantially loosely inserted into the packing storage space 5, it smoothly enters into the storage space 5, and then,
A tightening tool 11 is attached to the push ring 9, and the tip end surface 10 of the push ring is placed against the packing 15 (see FIG. 4).

(3) When the push ring 9 is further advanced by rotating the nut 13 of the tightening tool 11, the front end of the packing 15 hits the inner vertical wall 4, and the packing 15 is compressed by the tip surface 10 of the push ring that is pushed further. As the packing 15 rises from the inclined state, it is pushed out in the radial direction of the tube, and the outer end surface of the packing 15 in the radial direction comes into close contact with the inner circumferential side wall 3 of the socket. After that, the press ring 9 is fixed to the socket l by the tightening tool 11 in the fixed position as shown in FIG.

In addition, the compression of the entire packing 15 in the fixed position is within the range of 10% or more without causing permanent compression strain (preferably around 30% (±5%)). ). Therefore, the distance between the inner vertical wall 4 of the socket portion 1 and the tip end surface 10 of the press ring 9 is determined to be a distance that provides the above-mentioned crushing margin.

(4) When fluid pressure acts on the vc-connected connecting rod portion, the fluid pressure acts on the constriction portion 15c of the packing 15, further compressing the inner and outer bulges 15a and 15b of the packing 15. As a result, the six packing 15 comes into closer contact with the contact surface and exhibits a water-stopping effect.

FIG. 5 shows another embodiment of the invention.

FIG. 5(a) shows a sleeve pipe joint in which the joint half structure of the present invention is applied to both ends of the sleeve 20, J.

K are two fluid pipes to be connected. Other symbols are the same as in the previous embodiment.

FIG. 5(b) is also an example of a sleeve joint, but in this example, the sleeve 30 has no flange, and the push rings that abut each other at both ends are screwed together with the elongated port 32 and its both ends. The tightening consisting of a nut 33 shows a structure using a tool 31, and L and M are two fluid pipes to be joined.

Other symbols are the same as in the previous embodiment.

The present invention is not limited to the above-described embodiments, and various design changes can be made within the scope of the basic technical idea of the present invention. That is, the following aspects are included within the technical scope of the present invention.

(2) In the unembodied example, the pressing ring 9 takes the form of a flat plate, but is not limited to this form, and may also take a form in which the packing pressing end surface 10 protrudes. In this case, the inner vertical wall 4 of the socket is provided further back, and the press ring 9 is tightened in the fixed position.
From the packing pressing end face 10 to the inner vertical wall 4 of the socket part
The distance up to is maintained at the required length.

■The cross section of the packing is not limited to the double-headed shape, but any other suitable shape (for example, elliptical shape) may be adopted as long as it provides the same effect.

[Brief explanation of drawings]

1 to 5 show an embodiment of the fluid pipe joint of the present invention, FIG. 1 is a longitudinal cross-sectional view showing the tightened state of one embodiment in the fixed position, FIG. 2 is an exploded cross-sectional view, 3 and 4 are sectional views showing the connection procedure, and FIGS. 5(a) and 5(b) are drawings showing other embodiments. FIGS. 6(a), 6(b), and 6(c) are drawings showing the conventional comb hand structure. l...Socket part 3...Inner peripheral side wall 4...Inner vertical wall 5...Packing accommodation space 7...Socket part 9
...Press ring lO...Packing pressing tip surface 11...
・Tighten with tool 15...Packing

Claims (1)

[Claims] 1. A socket part (1) having a packing accommodation space (5) formed by an inner circumferential side wall (3) and an inner vertical wall (4), and an inside of the socket part (1). The socket part (7) inserted into the socket part (7) has an inner diameter smaller than the outer diameter of the socket part (7) with a crushing allowance in the natural inclined state, and the outer diameter is smaller than the outer diameter of the socket part (1).
) is abutted against the outer end of the socket portion (1) by a tightening tool (11), and in the tightened position, The packing accommodation space (5) is closed, and the packing (15) is tightened by tightening the tightening tool (11).
) is brought into contact with the inner vertical wall (4) and its outer end surface is brought into contact with the inner circumferential side wall (3) to be press deformed, and the distance to the inner vertical wall (4) is the packing. (15) A fluid pipe joint comprising: a press ring (9) having a packing press end surface (10) that maintains a spacing smaller than the width of the press ring (9).