JPS6111590Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a flexible joint for piping used in water piping and other piping parts, and in particular,
This relates to the structure of the connection part.

Conventionally, as shown in Fig. 1, this type of piping joint is attached to the end of a bellows-shaped flexible joint body 2 by fitting male screw or cap nut-shaped connecting fittings 3, 4 onto the ends of the flexible joint body 2. It is common to connect a screw or a cap nut by screwing it into a female or male thread on the other side.

However, in the above-mentioned conventional type, when the connecting fitting 3 is a tapered male pipe thread, this male thread is fixed to the end of the fitting body 2 by brazing or welding, and in this case, the female thread of the mating If the screw rotates, it can be installed relatively easily, but if it does not, the entire pipe must be rotated to screw in, and if it is not possible to rotate the entire pipe at that time, installation is difficult. There was an inconvenience that I was unable to do so. Further, in the case of mounting by brazing or welding in this manner, not only is the cost high, but also there is a problem of corrosion and poor durability. On the other hand, in the case of the connection fitting 4 of a cap nut having a parallel male thread for pipes, as shown in FIG. However, in this case, at the time of installation, an annular packing 1 is inserted between the end of the joint body 2 and the other party, as shown in the same figure.
It is necessary to insert and screw it in. Moreover, in this case, if a tapered thread is used, such a packing 1 cannot be used, and therefore, the other party position must be a parallel thread for pipes, and when connecting with a tapered thread, it is always necessary to use a dedicated This method requires male and female nipples, which is troublesome to work with, and it is inconvenient that the seal and nipple must be prepared separately at all times. In addition, 2 in Figure 1
2a and 2a indicate cylindrical portions without bellows at both ends of the joint body 2.

The present invention was developed in view of these conventional drawbacks.In other words, even when a tapered male thread for pipes is used as a connecting fitting, the present invention allows for easy connection by rotating this male thread. In addition, there is no corrosion problem and it can be manufactured at low cost.On the other hand, even when a cap nut is used as a connection fitting, a cap nut with a tapered female thread for pipes is used. In particular, the object is to enable easy installation without the use of packing, male and female nipples or unions, etc.

In order to achieve this purpose, in this invention, first, a connecting fitting is fitted onto the end of the flexible fitting body for piping, and this connecting fitting is pulled out by a diametrical protrusion provided on the fitting body. It is maintained so that it does not occur. Then, an O-ring is inserted into a circumferential space formed between the connecting fitting and the joint body, and a threaded portion is formed on the outer periphery of the connecting fitting or on the inner periphery of the connecting fitting that protrudes from the fitting body. It is characterized by the fact that

According to the configuration of the present invention, O is provided in the circumferential space formed between the connecting fitting and the joint body.
Since the O-ring is inserted, the sealing function is achieved by this O-ring, and there is no need to secure it by brazing etc. even when using a parallel male thread for pipes. Even when screws are used, there is no need to prepare seals, nipples, etc. separately.

Hereinafter, the structure of this invention will be explained based on the embodiments shown in FIG. 2 and below. Note that the same reference numerals are used for the same parts as in the conventional example shown in FIG. Therefore, in FIG. 2, the connecting fitting 3 has a tapered male pipe thread part 5 and a hexagonal part 6 formed on its outer periphery, the diameter becoming smaller toward the outer end. A tapered portion 7 that becomes larger in diameter toward the outside on the inner circumference of the
In this embodiment, an O-ring 9 is inserted into an annular space 8 formed between the inner circumference of the tapered part 7 and the outer circumference of the cylindrical part 2a.

Reference numeral 10 denotes a flange portion extending outward along the circumferential direction of the end portion of the joint body 2 and serving as a protruding portion protruding diametrically outward as claimed in the claims of the utility model registration. 10 is located outside the outer end of the connection fitting 3 and connects the connection fitting 3 and O.
This prevents the ring 9 from coming off. On the other hand, on the outside of the inner end of the connecting fitting 3, a bulging part 11 having a semicircular cross section is formed in which the joint body cylindrical part 2a protrudes outward along the circumferential direction. Therefore, the movement of the connecting fitting 3 in the longitudinal direction is restricted. In this case, the bulging portion 11 comes into contact with the inner end of the connecting fitting 3 and pushes the connecting fitting 3 outward. Due to this, the tapered part 7 of the connecting fitting 3 is
It is pushed toward the ring 9, increasing the sealing effect. In this case, when the connecting fitting 3 is screwed into the female threaded portion of the other party, the connecting fitting 3 is pulled outward and tightens the O-ring 9, so that the sealing effect becomes even greater. In addition, in FIG. 2, the connecting fitting 3 is fitted into the cylindrical portion 2a without any gap, but
It is of course possible to provide a gap, and by doing so, it becomes easier to rotate the connecting fitting 3 during installation.

FIG. 3 shows another embodiment of the present invention, and in this FIG. 7, a stepped large diameter portion 12 is formed on the inner periphery of the outer end of the connecting fitting 3, and an O-ring 9 is inserted into the space 8 formed by this large diameter portion 12. On the other hand, in the lower half, instead of such a large diameter part 12, an annular groove 13 is formed along the circumferential direction on the inner periphery of the central part of the connecting fitting 3, and a stepped large diameter groove is formed on the inner end of the connecting fitting 3. 12, and O-rings 9, 9 are also inserted into the respective cavities 8, 8 formed by these. In this embodiment, the bulging portion 11 on the inner end side of the connection fitting 3 is crushed in the longitudinal direction, thereby restricting movement of the connection fitting 3 in the longitudinal direction inward. Further, in this lower half part, O-rings 9, 9, and 9 are provided at three locations, but any combination of these may be used, and it is sufficient to provide only one or two locations.

Next, FIGS. 4 and 5 show that in a bellows-type joint body 2 that does not have the cylindrical part 2a as shown in FIG. In each case, an O-ring 9 is inserted into a cavity 8 formed by a bellows valley 14 located on the circumference of the connection fitting 3. There is.
In the embodiment shown in FIG. 4, a retaining ring 15a is fitted onto the bellows valley 14 of the joint body 2 on the outside of the outer end of the connecting fitting 3, thereby preventing the connecting fitting 3 from coming off. , also the connection fitting 3
Also on the outside of the inner end, a retaining ring 15b is fitted onto the bellows trough 14 to restrict movement in the longitudinal inward direction. On the other hand, in FIG. 5, a plurality of bellows peaks at the end of the joint body 2 are crushed to form a flange portion 10 to prevent the connecting fitting 3 from coming off.

Figures 6 to 8 show the above male threaded connection fitting 3.
In place of this, an embodiment is shown in which a cap nut-shaped connecting fitting 3 having a tapered female pipe thread is attached, and a large-diameter hole is attached to the circumferential surface of the connecting fitting 3 that protrudes from the joint body 2 toward the outside. In addition, in FIG. 6, at the external fitting part to the joint main body circumferential part 2a, as in the case of FIG. 2, at the outer end of the connecting fitting 3, Forming a tapered portion 7 that becomes larger in diameter toward the outside, inserting an O-ring 9 into the cavity 8 formed by this tapered portion 7,
On the other hand, in FIG. 7, similarly to FIG. 3, a stepped large-diameter portion 12 is formed on the inner periphery of the outer end of the connecting fitting 3, and an O-ring 9 is inserted into the space 8. Furthermore, in FIG. 8, the connecting fitting 3 is externally fitted onto the bellows portion as in FIG. 5, and the O-ring 9 is inserted into the bellows trough 14. The means for preventing the connecting fitting 3 from coming off and restricting its movement in the longitudinal direction in FIGS. 6 to 8 are as shown in FIGS. 2 and 3 in FIGS. 6 and 7, and as shown in FIGS. The configurations are the same as in FIG. 5.

In Fig. 1 above, the male thread type connecting fitting 3 of the present invention is attached to one end of the joint body 2, and the cap nut type connecting fitting 4 equipped with a conventional parallel pipe thread is attached to the other end. Instead of the cap nut type connecting fitting 4, the cap nut type connecting fitting 3 of the present invention having a tapered female thread for pipes as shown in FIGS. 6 and 7 may be attached. of,
Alternatively, the cap nut type connecting fittings 3 of the present invention may be attached to both ends.

Now, the present invention has the above-mentioned configuration, and according to the present invention, an O-ring is interposed between the connecting fitting and the joint body, and the connecting fitting is fitted externally, so that it can be used for pipes. Even when using a tapered female thread, there is no need to prepare special packing or nipples.
The attachment work is easy, and there is no need to fix the connecting fitting by brazing or the like, so it can be manufactured at low cost, and since the connecting fitting is rotatable, it is easy to install.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of the main part of a piping joint showing a conventional example, Fig. 2 is an enlarged vertical sectional view of the main part of a pipe fitting showing an embodiment of the present invention, and Figs. 3 to 8 are respectively FIG. 7 is a vertical cross-sectional view of a main part of a connection fitting attachment part showing another embodiment of the present invention. 2...Joint body, 3...Connection fitting, 5...Male thread part, 7...Tapered part, 8...Vacancy, 9...O ring, 10...Flange part, 11...Bulging part, 1
2...Large diameter portion, 13...Groove portion, 14...Bellows valley, 15a, 15b...Retaining ring, 16...
Female thread part.

Claims (1)

[Claims for Utility Model Registration] 1. A connecting fitting is fitted onto the end of the main body of a flexible joint for piping, and this connecting fitting cannot be removed from the joint body by a diametrically outward protrusion provided on the joint body. At the same time, O-rings are inserted into the circumferential spaces formed between these connecting fittings and the joint body, and screws are inserted on the outer periphery of the connecting fittings or on the inner periphery of the connecting fittings that protrude from the fitting body. A flexible joint for piping, characterized in that a flexible joint is formed with a section. 2. The flexible piping according to claim 1 of the utility model registration claim, in which a tapered portion that becomes larger in diameter toward the outside is formed on the inner periphery of the end of the connecting fitting, and an O-ring is inserted using this tapered portion as a void. Fittings. 3. The flexible joint for piping according to claim 1, wherein a stepped large diameter portion is formed on the inner periphery of the end of the connecting fitting, and an O-ring is inserted using this large diameter portion as a void. 4. The flexible joint for piping according to claim 1, wherein a layered annular groove is formed in the inner periphery of the connecting fitting in the circumferential direction, and an O-ring is inserted using this groove as a void. 5. The flexible joint for piping according to claim 1, wherein a connecting fitting is externally fitted onto the bellows portion of the bellows type joint body, and an O-ring is inserted using the bellows valley as a void.