JPS6238068Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an airtight connection device for a pressure-resistant flexible pipe joint. For example, when connecting a pressure-resistant flexible pipe for electrical wiring to a control panel, etc., The washer on the joint installed in the washer has been improved to enable a highly airtight connection between the joint and the control panel, etc.

For example, when connecting a pressure-resistant flexible tube for electrical wiring that is used by enclosing pressurized gas to a control panel, etc., it is common to attach a joint attached to the mouth end of the flexible tube to the wall plate of the control panel. However, the conventional mounting method, as shown in Fig. 4, is to provide a flange-shaped portion 5' on the joint body 1', and protrude a base portion 3 to be screwed into the lock nut 4 on the left side in the figure. And wall board 2
To install this joint body 1', fit an annular packing 8 with a rectangular cross section and a flat washer 7' onto the joint body 1' as shown in the figure, and tighten the lock nut 4 to obtain airtightness. There is. However, there is usually a large clearance between the fitting hole 2a provided in the wall plate 2 and the base part 3 due to the difference in diameter, and the contact surface 6' between the joint body 1' and the flat washer 7' is Since it is made of metal, it does not have sufficient airtightness and has a defect that allows oil etc. to seep in. Also, if a flat metal washer is not used, the rubber seal will come into direct contact with the clamping surface of the joint body, causing damage to the joint body and wall plate when tightening the lock nut. As the rubber gaskets rotate and shift from each other, the rubber gaskets tend to be twisted or tightened more strongly than necessary, both of which cause excessive stress and cause the gaskets to age quickly and lack durability.

This idea was proposed to eliminate the above defects, and uses a metal washer with an L-shaped cross section.
To obtain an airtight connection device capable of maintaining high airtightness while preventing unnecessary deformation of a rubber packing.

Below, the present invention will be explained based on examples.
In FIG. 1, a joint body 1 has a mouthpiece 3 that is inserted into a hole in a wall plate 2 such as a control panel to which it is to be attached, and the outer periphery of the mouthpiece 3 is threaded so that a lock nut 4 is screwed into the joint body 1. It is engraved. The intermediate portion has a flange-like portion 5, and a clamping surface 6 for clamping the wall plate 2 together with the lock nut 4 is provided. When attaching the joint body 1 to the wall plate 2, a metal cup-shaped washer 7 and packing 8 are inserted.
This washer 7 is an annular body with an L-shaped cross section, in which a collar part 9 and a cylindrical side part 10 extending at right angles to the wall plate side are integrally formed, and is pressed against the wall plate 2 by tightening the lock nut 4. The diameter of the end 15 of the cylindrical side part 10 is formed to be larger than both the hole diameter of the wall plate 2 and the diameter of the flange-like part 5, and the flange part 9
The inner diameter is made sufficiently larger than the outer diameter of the smooth portion 11 at the unthreaded base of the cap portion 3 so that the seal 8 has a portion that directly contacts the clamping surface 6. A stepped portion adapted to the inner diameter and plate thickness of the flange portion 9 is provided near the outer edge of the flange portion 5.
There should be no step at the bottom of the annular recess formed by the washer 7 and the joint body 1. This washer 7 is made of metal and has a material and dimensions that are strong enough to withstand strong tightening torque.

The packing 8 is an annular rectangular cross-sectional packing made of durable synthetic rubber or synthetic resin, and its inner diameter is strong against the outer periphery of the smooth portion 11 due to expansion in the inner diameter direction when it is tightened with the lock nut 4, as will be described later. It is preferable to make the diameter as small as possible so that the mouthpiece 3 can be forcibly fitted, and its outer diameter is the same as the lip 10 of the washer 7.
It is made slightly smaller than the inner diameter, with a slight gap, and when the lock nut 4 is tightened, the expansion of the packing 8 in the outer circumferential direction is restrained by the cylindrical side part 10, promoting strong contact between the inner diameter of the packing 8 and the smooth part 11. I try to do that.

To explain the operation of the present invention configured as above, the washer 7 is fitted into the stepped portion of the clamping surface 6, and the packing 8 is inserted into the annular recess formed by the washer 7, the clamping surface 6, and the smooth portion 11. Insert the cap part 3 into the hole in the wall plate 2 of the control panel etc.
When the lock nut 4 is screwed together (until it is not tightened), as shown in FIG.
The contact surface 12 between the packing 8 and the clamping surface 6 and the contact surface 13 between the packing 8 and the clamping surface 6 are in loose contact with each other. here,
If the lock nut 4 is tightened appropriately, the gasket 8 will be compressed in the thickness direction as shown in FIG.
3 are in close contact with each other to provide a high airtight effect, and expand in the outer and inner diameter directions, and since the outer diameter direction is restrained by the cylindrical side part 10, they expand further in the inner diameter direction and the smooth part 11 Strongly adheres to the outer surface to create an airtight effect. Since this device is constructed as described above, no matter how large the diameter of the hole provided in the wall plate 2 is compared to the diameter of the base portion 3, the end 15 of the cylindrical side portion 10 If a washer 7 whose diameter is sufficiently larger than the above-mentioned hole diameter is selected and used by fitting it into the joint body 1, it is possible to maintain a good airtight effect at all times. In addition, all locations that are likely to become leakage paths for the internal compressed gas are closed by the packing 8, and there are no locations where the washer 7' and the joint body 1' are in direct contact, as in the conventional case, ensuring airtightness. will definitely be maintained. Furthermore, since the cylindrical side portion 10 of the washer 7 prevents the packing 8 from being squeezed between the wall plate 2 and the clamping surface 6 and trying to protrude in the diametrical direction, the packing 8 is held in place by that amount. Since it is pressed against the smooth portion 11 of the main body 1, such a pressed state can be obtained without tightening the lock nut 4 too much. Therefore, even if the gasket 8 is brought into direct contact with the clamping surface 6 of the joint body 1, there is no possibility that the joint body 1 will rotate and the gasket 8 will be twisted and damaged as a result.

Further, since the end 15 of the cylindrical side portion 10 is formed to have a larger diameter than the outer diameter of the flange-like portion 5, when the lock nut 4 is tightened to press the end 15 against the wall board 2, Elastic deformation of bending occurs in the flange 9,
Therefore, the pressing force of the end 15 is provided by a spring force with a low spring constant, and if the lock nut 4 is properly loosened, the pressing force will hardly decrease. It can be expected to have the same effect as the spring washer used in the past, and is extremely effective in preventing loosening. This effect can be achieved by making the outer diameter D ₂ of the washer 7 suitably larger than the outer diameter D ₁ of the flange-shaped portion 5 and tightening the lock nut 4.
The same result can be obtained even if the washer 7 is tightened to cause deformation near the inner edge of the washer 7 as shown in FIG. In addition, since the washer 7 is provided with a cylindrical side portion 10, damage to the packing 8 due to over-tightening of the lock nut 4 can be prevented, and the joint can be connected to the wall plate 2.
The airtight connection device according to the present invention has extremely remarkable effects, such as being extremely economical as it is only necessary to change the washer 7, which is made separately from the joint body 1, when selecting a hole diameter according to the hole diameter. It is something that can be played.

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal front view of an embodiment of the present invention before the lock nut is tightened, Fig. 2 is the state after the lock nut is tightened, and Fig. 3 is a partially longitudinal front view of another embodiment. FIG. 4 is a partially vertical front view of a conventional joint airtight connection device. Description of symbols, 1...Joint body, 2...Wall plate, 3...
...Band portion, 4...Lock nut, 5...Flange-shaped portion, 6...Closing surface, 7...Washer, 8...
Packing, 9... collar part, 10... cylindrical side part.

Claims (1)

[Scope of utility model registration request] A flexible tube is connected to one side of the joint body 1, and the other side has a base part 3 with a threaded outer periphery to be inserted into a hole in the wall plate 2 to be attached, and a flange-shaped part provided in the middle. A joint body 1 which is strongly clamped via an annular flat packing 8 by a clamping surface 6 on the side surface of the mouthpiece 3 of the part 5 and a lock nut 4 screwed onto the outer periphery of the mouthpiece 3 to maintain airtightness. The washer 7 used for a pressure-resistant flexible pipe joint that is attached to a wall plate 2
has a flange part 9 and a cylindrical side part 10 whose outer periphery is formed at right angles, the inner diameter of the flange part 9 is larger than the inner diameter of the packing, and a washer 7 is provided on the clamping surface 6. A step is provided on the clamping surface 6 so that the flange 9 is fitted flush with the clamping surface 6,
The collar part 9 of the washer 7 is fitted here, and the diameter of the end 15 of the cylindrical side part 10 is larger than both the hole diameter of the wall plate 2 and the outer diameter of the flange-shaped part 5, In addition, an annular flat packing 8 is fitted into a concave portion with no step formed by the washer 7 and the clamping surface 6, and the locking nut 4 screwed into the end of the mouthpiece 3 is tightened to secure the wall board 2. 1. An airtight connection device for a pressure-resistant flexible pipe joint, characterized in that it is configured to be sandwiched between a clamping surface 6 and a clamping surface 6, and to be pressed against a smooth portion 11 of a mouthpiece portion 3.