JP2501974Y2 - Pipe end anti-corrosion pipe fitting - Google Patents

Description

[Detailed Description of the Invention] Industrial application The present invention relates to a pipe joint such as a water pipe, in particular, a pipe end protection in which an elastic packing that is watertightly contacted with an end face of a pipe member to be connected is attached to an insertion portion. Regarding eclipse fittings.

2. Description of the Related Art For example, a phenomenon may occur in which a pipe joint or a water pipe that feeds tap water is corroded to generate red water and the outflow amount of tap water decreases. Corrosion of the pipeline also occurs when the amount of chlorine added increases as the water quality deteriorates. Currently, in order to prevent the corrosion of the pipeline, a corrosion-resistant resin lining is applied to both the inner peripheral surface and the inner peripheral surface of the pipe member and the pipe joint. When using a pipe having a resin lining, the pipe is cut into a predetermined length. Since the metal surface without the resin lining is exposed as it is on the cut end surface of the pipe, corrosion of the pipe often progresses from the metal surface.

FIG. 5 shows a conventional pipe joint in which the end surface of the pipe is prevented from corrosion. The joint body 5 of the pipe joint 1 is provided with a female screw portion 3 to which the pipe member 6 is screwed. Further, the core 2 is provided in the joint body 5 by injection molding a molten resin. A screw 7 that is screwed into the female screw portion 3 of the joint body 5 is provided on the outer peripheral surface of the pipe member 6. A resin lining 8 is applied to the inner surface of the pipe member 6. An annular rubber packing 9 is attached to the insertion portion 2a of the core 2 of the pipe joint 1. The packing 9 is set at a position where the insertion amount of the pipe member 6 is the shallowest within the screw tolerance. The packing 9 is watertightly adhered to the end face of the pipe member 6 for corrosion resistance.

As shown in FIG. 6, an inclined surface 9a is provided on the packing 9 in conformity with the chamfered portion 6a formed on the end surface of the pipe member 6 for deburring, and the inclined surface 9a is provided on the chamfered portion 6a of the pipe member 6. It can be closely adhered to prevent corrosion.

However, in the conventional packing 9, since the flat portion 9b is formed on the opposite side of the inclined surface 9a of the packing 9, the tubular member 6
Since the inclined surface 9a is in contact with the chamfered portion 6a, the packing 9 must be attached to the pipe joint 1 from the correct direction in which the inclined surface 9a of the packing 9 is always directed outward. As shown in FIG. 7, if the mounting direction of the packing 9 is wrong with respect to the pipe joint 1,
The flat portion 9b on the opposite side of the packing 9 faces the end surface of the pipe member 6, and the flat portion 9b of the packing 9 does not come into close contact with the chamfered portion 6a of the pipe member 6. Therefore, the chamfered portion 6a is exposed to the fluid in the pipe member 6 and there is a disadvantage that the corrosion resistance cannot be ensured.

An object of the present invention is to provide a pipe end anticorrosion pipe joint in which an elastic packing can be reliably brought into contact with the pipe end to prevent corrosion of the pipe end.

Means for Solving the Problems A pipe end anticorrosion pipe joint according to the present invention is provided inside a joint body (15) having an internal thread portion (13) for connecting a pipe member (20) and a joint body (15). And the pipe member to be connected (2
Resin core (1) with insert (12) to be inserted into (0)
1) and an annular elastic packing (30) attached to the insertion part (12) of the core (11). Elastic packing (3
0) has a tapered taper portion (34) on the outer side in the radial direction. The tapered portion (34) of the elastic packing (30) is symmetrical with respect to the central axis (35) in the thickness direction, and in any case, a pair of inclined surfaces (which can contact the inclined surface (23) of the pipe member (20) ( 31, 32), and one of the pair of inclined surfaces (31, 32) abuts the inclined surface (23) of the pipe member (20).

Action The pair of inclined surfaces (31, 32) of the elastic packing (30) are symmetrical with respect to the central axis (35) in the thickness direction, and any of them can contact the inclined surface (23) of the pipe member (20). Therefore, there is no restriction on the mounting direction of the elastic packing (30) into the joint body (15), and it is not necessary to pay particular attention to the mounting direction. For this reason,
Erroneous mounting of the elastic packing (30) can be prevented and the efficiency of assembly work can be improved. Further, one of the pair of inclined surfaces (31, 32) of the tapered portion (34) of the elastic packing (30) has a tubular member (20).
The large contact surface ensures reliable and watertight contact with the inclined surface (23). Ribs (43) formed on top of elastic packing (30)
Can contact the end surface (24) of the pipe member (20) in a watertight manner to suppress corrosion.

EXAMPLE An example of the pipe end anticorrosion pipe joint according to the present invention will be described below with reference to FIGS.

The elbow type pipe joint 10 shown in FIGS. 1 and 2 includes a joint body 15 made of casting and a core 11 made of an anticorrosive synthetic resin provided along the inner peripheral surface of the joint body 15. There is. The female screw portion 13 formed on the inner peripheral surface of each of the both ends of the joint body 15 is threadedly connected to the outer peripheral screw 21 formed on the outer periphery of the connecting end portion of the pipe member 20 to be connected. A thin-walled annular insertion portion 12 is provided at both ends of the core 11, and a void portion 14 is formed between the insertion portion 12 and the female screw portion 13. As shown in Fig. 1, the pipe joint
A rubber annular elastic packing 30 is attached to the insertion portions 12 formed at both ends of the core 11 in the core 10. Pipe member
A resin lining 22 having corrosion resistance is provided on the inner peripheral surface of 20 in the length direction. Normally, the end surface of the pipe member 20 is connected to the inclined surface 23 (FIG. 2) and the inclined surface 23 at the end surface during construction, and the end surface 24 is formed on the outer surface.

The elastic packing 30 has a taper portion 34 that is tapered outward in the radial direction forming a pair of inclined surfaces 31 and 32 that are symmetrically inclined with respect to the central axis 35 in the thickness direction, and the top 33 is provided at the tip of the taper portion 34. It is formed. One of the pair of inclined surfaces 31 and 32 is in watertight contact with the inclined surface 23 of the pipe member 20.

At the time of screw connection with the pipe member 20, the elastic packing 30 is inserted into the void portion 14 formed by the insertion portion 12 of the core 11. Annular elastic packing 30 having symmetrical inclined surfaces 31, 32
There is no restriction on the mounting direction, and there is no gap from any direction.
It can be attached to 14. Insert the outer peripheral thread 21 of the pipe member 20 into the pipe joint 10
When the pipe joint 10 or the pipe member 20 is rotated in the relative direction by being screwed into the female screw portion 13 on the side, the pipe member 20 advances into the pipe joint 10, and as shown in FIGS. 2 and 3 (a). , Elastic packing 30
The inclined surface 32 of the pipe 20 is in watertight contact with the inclined surface 23 of the pipe member 20,
The inclined surface 23 is protected from corrosion. The elastic packing 30 is compressed by the pipe member 20 and comes into close contact with the inclined surface 23 of the pipe member 20. At the same time, the deformed portion 34 of the elastic packing 30 that has been compressed and deformed comes into close contact with the end surface 22a of the resin lining 22. in this way,
One inclined surface 32 of the elastic packing 30 is attached to the inclined surface 23 of the pipe member 20.
Is watertightly adhered, and the inclined surface 23 is protected from corrosion by tap water.

In the elastic packing 30 shown in FIG. 2, the end surface 24 of the pipe member 20 is
The elastic packing 40 shown in FIG. 4 is provided with an annular rib 43 which projects outward from the apex where the inclined surfaces 41 and 42 intersect and which adheres to the end surface 24 of the pipe member 20 in a watertight manner. The annular rib 43 protects the end surface 24 of the tube member 20 from corrosion.

Effect of the Invention As described above, in the pipe end anticorrosion pipe joint of the present invention, there is no restriction on the assembling direction with respect to the pipe joint of the elastic packing, and the pipe can be assembled from any direction. Therefore, the efficiency of the assembling work can be improved. After assembly, the front surface of the end surface of the pipe member comes into close contact with the inclined surface of the elastic packing, which enables good water-tight joining and prevents corrosion of the inclined surface of the pipe member.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a pipe end anticorrosion pipe joint according to the present invention, FIG. 2 is an enlarged sectional view showing a contact state between a pipe end and an elastic packing, and FIG. 3 (a) is an elastic packing. Partial sectional view showing a state before screwing, FIG. 3 (b) is a partial sectional view showing a state after screwing the elastic packing, FIG. 4 is a sectional view showing another embodiment of the elastic packing, and FIG. 6 is a sectional view of a pipe joint using a conventional packing, FIG. 6 is a sectional view showing a correct mounting direction of the conventional packing, and FIG. 7 is a sectional view showing an incorrect mounting direction of the conventional packing. 10 …… Pipe joint, 11 …… Core, 12 …… Insert part, 14 …… Gap part, 20 …… Pipe member, 23 …… Inclined surface, 24 …… End surface, 30, 40
...... Elastic packing, 31, 32, 41, 42 …… Sloping surface, 34 ……
Taper part, 35 …… Center axis, 43 …… Rib,

Claims (2)

(57) [Scope of utility model registration request] 1. A joint body (15) having a female screw portion (13) for connecting the pipe member (20), and a pipe member (20) provided inside the joint body (15) and to be connected. In a pipe end anticorrosion pipe joint including a resin core (11) having an insertion part (12) for inserting and an annular elastic packing (30) attached to the insertion part (12) of the core (11) , The elastic packing (30) has a taper (3
4), the taper part (34) of the elastic packing (30) is symmetrical with respect to the central axis (35) in the thickness direction, and in any case, the pipe member (20)
Has a pair of inclined surfaces (31, 32) capable of contacting the inclined surface (23) of the pipe, and one of the pair of inclined surfaces (31, 32) contacts the inclined surface (23) of the pipe member (20). A pipe end anticorrosion pipe joint characterized by the above. 2. A rib (43) which projects radially outwardly and contacts the end surface (24) of the pipe member (20) is formed on the top of the inclined surface (41, 42) of the elastic packing (30). The pipe end anticorrosion pipe joint according to 1.