JP4288312B2 - Flexible joint packing structure - Google Patents

Description

BACKGROUND OF THE INVENTION
[Prior art]
[0001]
Conventionally, a technique for sealing a flexible joint by compressing an annular rubber packing so that the joint and the pipe are in close contact with each other has been known. However, the joint diameter and the pipe size had to correspond one-to-one because of the limit of rubber deformation.
[0002]
For example, to branch an 80A pipe into a 100A pipe, a 100A x 80A T had to be used. Therefore, joint bodies had to be manufactured for each combination of pipe sizes, and the number of them was enormous. Production costs and maintenance costs for joint molds for each size combination, inventory costs for products that must be stocked in large quantities, setup time for mold replacement at the time of manufacture, labor for handling out-of-stock conditions, processing for each product type The cost of tools was enormous. In addition, many products had to be made, and sometimes they were out of stock or delayed in delivery, but the opportunity loss and damage to the customer's credibility were enormous. In addition, inventory costs at the distribution stage, management costs increased, and it was difficult for customers to place orders. In addition, the increase in costs at the manufacturing and distribution stages was ultimately borne by the customer.
[0003]
In addition, there is a known technique for preventing a drop by inserting a steel ball, cylinder, or ring between a tapered joint and a pipe. In addition, the technique of using metal fittings to fix the steel ball between the taper and the pipe was known. However, when using metal fittings, etc., they sometimes failed to follow the fluid pulsation or piping inclination.
[0004]
In addition, no technology has been known to prevent the pipe from coming off without depending on the diameter of the joint body.
[0005]
As a technology to hold down this packing, the technology to hold it down with bolts, screws, levers, etc. is known or easily analogized.
However, by loosening the fitting between the cap nuts and applying a wave to the screw, the cap nut is shaped so that the waves are engaged by the reaction force as it is tightened. No technology has been known to supply a product that works even when cast down to the level of casting and does not require machining and is inexpensive.
[Problems to be solved by the invention]
[0006]
If pipes with a diameter smaller than that of the joint body can be connected without changing the diameter of the joint body, for example, the joint bodies such as various sizes 100A × 80A, 100A × 65A, 100A × 50A, which are conventionally used in the T, are all 100A. × 100A T can be unified, and the number of molds can be greatly reduced.
[0007]
However, there is a limit to the deformation of the packing, and if the difference between the joint inner diameter and the pipe outer diameter is large, it is difficult to seal between them. In addition, there was a limit to the deformation of the packing, and the design tolerance of the joint had to be reduced. In addition, when trying to seal between the thin packing, there was a limit to the elasticity of the packing material, the sealing force was weakened, and there was a concern that wrinkles could form and leak from there. In addition, there were concerns about leakage due to thinning of the packing even at low pressure, and there was also concern about leakage due to aging of the packing.
[Means for solving the problems]
[0008]
As shown in FIG. 1, it has a disk 1 with a hole that fits into the outer diameter of the pipe, a cylinder 5 that fits into the outer diameter of the pipe, and a protrusion 6 that prevents the pipe from entering deeply. The disc 4 with a hole in the cylinder 5 with the annular packing 3 swelled on the outside to be fitted with the diameter is fitted with the inside diameter of the joint so that the cylinder 5 is inside, and the inside diameter is fitted with the disc. After inserting the cylindrical packing 2 having an inflated shape into the joint body and inserting the pipe 7, the disc 1 is pressed with, for example, bolts, screws, and levers so that the joint side and the pipe side are respectively By sealing with another packing, it is possible to connect pipes of any size below the joint body diameter by changing the packing without depending on the limit of deformation of the packing and without changing the size of the joint body. When That. Figure 2 shows a perspective view of the inventive packing.
[0009]
In addition, as a method of holding the packing, as shown in FIG. 3, the cap nut-shaped shape 8 loosens the screw-to-screw engagement and waves the screw part so that the waves mesh with each other by the reaction force as tightened. This prevents the screws from loosening and functions even if the dimensional accuracy is reduced to the level of casting.
[0010]
Further, as shown in FIG. 5, a taper 9 is provided in the hole of the disk 1 having a hole to be fitted with the pipe on the insertion port side, and a sphere, cylinder or ring 10 is inserted between the taper and the pipe, and the elasticity of the packing is used. By pressing the ball or cylinder or ring between the taper and pipe, pipes of any size smaller than the joint body diameter can be obtained by changing the packing without changing the size of the joint body without depending on the processing accuracy of the joint. Applicable and reduces the dropout even with respect to the pulsation and inclination of the fluid.
DETAILED DESCRIPTION OF THE INVENTION
【Example】
[0011]
As shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 4, when a water pressure leak test was performed, no leak was found at 0.1 MPa water pressure.
【The invention's effect】
[0012]
Since there is no need to depend on the deformation limit of the packing material, the dimensional tolerance can be increased, and it is possible to connect pipes of any size smaller than the fitting body diameter simply by changing the packing without changing the size of the fitting body. Therefore, it is possible to reduce the cost of the mold according to the combination of the joint body diameters.
[0013]
Even if the dimensional accuracy is reduced to the casting level of casting, it is possible to supply an inexpensive product that does not require machining.
[0014]
Regardless of the processing accuracy of the joint body, it can be applied to pipes of any size smaller than the joint body diameter by changing the packing without changing the size of the joint body, and it is possible to reduce slippage against fluid pulsation and inclination. You can do it.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a packing according to the present invention.
FIG. 2 is a perspective view showing an exploded position of the packing of the present invention.
FIG. 3 is a cross-sectional view of a flexible joint that holds the packing of the present invention.
FIG. 4 is an enlarged cross-sectional view of the retaining portion of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Disc with hole 2 Cylindrical packing 3 Annular packing 4 Disc 5 with hole 5 Cylinder 6 Protrusion to prevent deep pipe penetration 7 Pipe 8 Cap nut shape 9 Taper 10 Ball or cylinder or ring

Claims (3)

A disk with a hole that fits into the outer diameter of the pipe, a cylinder with an inner diameter that fits into the outer diameter of the pipe, and a protrusion that prevents the pipe from entering deeply, and an annular packing that fits into the outer diameter of the pipe at the end of the cylinder It has a structure in which a cylindrical packing with a hole with a cylinder attached is sandwiched between the outer diameter of the cylinder and the inner diameter of the joint so that the cylinder is on the inside and the inner diameter is fitted with the disk. After inserting the packing structure into the joint body so that the disk with a hole that fits the outer diameter of the pipe is on the outside, that is, on the pipe insertion port side, and inserting the pipe into the packing structure, By holding the insertion side disk with bolts, screws, levers, pressure, etc., and sealing the joint side and pipe side with separate packings, it is not necessary to depend on the deformation limit of the packing material. Dimensional Containers range can increase, flexible joint packing structure characterized by making it possible also to connect the joint body diameter following pipes of any size simply by changing the no packing structures varying the size of the joint body. In the flexible joint packing structure according to claim 1, a taper is formed in a disk hole having a hole to be fitted with the pipe on the insertion port side, and a ball, a cylinder or a ring is inserted between the taper and the pipe. By pressing the sphere or cylinder between the taper and the pipe, the pipe structure can be changed to any size below the joint body diameter by changing the packing structure without changing the joint body size without depending on the processing accuracy of the joint body. Is a flexible joint packing characterized by being able to adapt to fluid pulsation and inclination and reducing leakage. The joint for holding the flexible joint packing structure according to claim 1, wherein the cap nut is shaped by loosening the fitting between the screws and corrugating the screw parts, and by reacting the waves with the reaction force as tightened. This prevents the screws from loosening and functions even if the dimensional accuracy is reduced to the casting level of casting. It suppresses the packing, which is characterized by supplying a low-cost product that requires no machining by casting only. Flexible joint.

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