JPH0334519Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention connects electric wires passed through a conduit or flexible tube through a connector, or connects a captire cable through a connector. The present invention relates to an improvement in an airtight packing that is attached between a conduit, a flexible tube, or a captire cable and a connector or a device when the electric wire or captire cable is wired inside the device.

(Prior Art) Conventionally, for example, as shown in FIG.
In order to maintain airtightness between the device 1 and the device 1, a gasket 6 is inserted into a stepped hole 4 formed in the base 2 while being sandwiched between washers 5, and the gasket 6 is tightened with a nut 7.

(Problem to be solved by the invention) In this case, a groove 8 having a U-shaped longitudinal section is formed in the center of the outer periphery of the packing 6, and when the packing 6 is tightened, the center of the inner periphery of the packing 6 expands. However, because the compressive force of the packing 6 is not necessarily uniform on the circumference, the mating surfaces of the grooves 8 shift and deform from state A to state B in Fig. 5.
In this case, the state of deformation is not constant depending on the degree of tightening, the degree of distortion of the packing 6, etc., and this has the disadvantage that the airtightness of the packing 6 deteriorates.

(Means for Solving the Problem) The present invention provides a longitudinal section of the rubber ring-shaped packing that is tightened from both ends so that the center part of the inner periphery of the packing uniformly bulges out on the inner periphery. The packing has an inclined surface forming a step-like valley, and the step-like shape of the sloped surfaces on both sides of the valley are formed by shifting the steps asymmetrically from the left and right around the valley in the longitudinal section of the packing.

(Function) When a gasket configured in this manner is tightened from both ends, at the initial stage of tightening without putting too much force on the gasket, the asymmetrical stair steps on both sides of the gasket fit smoothly into each other, and in this state. In its longitudinal section, the packing is compressed and deformed substantially evenly on both sides centering on the valley,
When the packing is further tightened from this initial tightening state, the packing is further compressed and deformed, and the central part of the packing's inner circumference at the trough position bulges out. Although the mating surfaces on both sides of the trough of the packing tend to shift, the mating surfaces are formed in a step-like manner and engage with each other and do not shift, so that the packing is held substantially evenly on the left and right sides around the trough in the longitudinal section, at the initial stage of tightening. When the gasket is compressed and deformed in the same way, the center part of the inner circumference of the gasket bulges out uniformly over the circumference, greatly improving the airtightness of the gasket.

(Example) Next, the configuration of an example of the present invention is shown in Figures 1 to 3.
This will be explained using figures.

A stepped wiring port 12 is formed in a wiring tube portion 11 protruding from the outer surface of various devices including connectors, such as a switch case 10, and a flexible auxiliary tube 13 for adjusting the outside diameter is formed in the wiring port 12. The captire cable 14 is inserted through the captire cable, and the captire cable 14 is formed at the tip of the auxiliary tube 13, and the guide portion 13a prevents the captire cable from being damaged by the corner of the wiring port 12. On the auxiliary tube 13 of 14, there is a rubber ring-shaped gasket 15 that is tightened from both ends. The packing 15 has a trough 17 in the shape of a step 16 on the sloped surface of the longitudinal section of the packing 15 at the center of the outer periphery. For example, the second row is asymmetrically centered on
As shown enlarged in FIG. A, the packing 15 shifted one step at a time, the ring washer 19 for pressing the cylindrical protrusion 18 formed on the end surface of the packing 15, and the tightening nut 20 are inserted, and The packing 15 and the ring washer 19 are inserted into the stepped wiring port 12 and are tightened by a tightening nut 20 screwed into the wiring port 12.

Next, the operation of this embodiment will be explained.

In the installed state of the packing 15 configured in this way, when the packing 15 is tightened from both ends, in the early stage of tightening without forcing the packing 15, the uneven steps 16 of the left and right asymmetrical steps 16 on both sides of the trough 17 of the packing 15 become smooth. At the same time, in this state, the valley part 1 of the packing 15
7 Both sides have the stairs 1 as shown in Figure 2B.
The six parts mesh with each other, and in this meshed state, the gasket 15 is compressed and deformed substantially equally on the left and right sides in its longitudinal section centering around the valley 17. When further tightened from this initial tightened state, the gasket 15 deforms evenly on both sides. 15 is further compressively deformed and the central part of the inner periphery of the packing 15 at the trough 17 position bulges out.
Although the stepped 16-shaped mating surfaces on both sides try to shift, since the mating surfaces are stepped 16-shaped and mesh with each other and do not shift, the packing 15 is substantially evenly spaced on the left and right sides with the trough 17 as the center in its longitudinal section. The packing 15 is compressively deformed in the same way as at the initial stage of tightening, and the center portion of the inner periphery of the packing 15 bulges out uniformly on the inner periphery, thereby greatly improving the airtightness of the packing 15.

In addition, in this embodiment, in particular, the curling of the end portion of the gasket 15 that is likely to occur during tightening (the third
(see figure) is formed on the end surface of the cylindrical protrusion 18.
This is prevented by pressing the ring washer 19, so that the tightening state of the packing 15 by the tightening nut 20 can be kept constant and a stable airtight property can be obtained. Can be formed on both ends.

(Effect of the invention) In order to uniformly bulge the center part of the inner periphery of the packing when tightening the rubber ring-shaped packing that is tightened from both ends, the central part of the outer periphery of the packing is provided with an inclined surface of the longitudinal section of the packing. In the packing, a step-like valley is formed, and the step-shaped slopes on both sides of the valley are shifted asymmetrically from side to side around the valley in the longitudinal section of the packing.

As a result, the present invention enables, at the initial stage of tightening,
On both sides of the valley of the packing, the asymmetrical uneven stairs fit together smoothly, and by aligning both sides of the valley of the packing without putting too much pressure on the packing, the occurrence of misalignment on this mating surface is also prevented. In this state, when the packing is further tightened, the packing is compressed and deformed, and the center of the inner circumference of the packing at the valley portion bulges out. Even if the mating surfaces on both sides try to shift, they will not shift because the mating surfaces are step-shaped and engage with each other. Even if the seal is tightened strongly, in its longitudinal section, it will not move around the trough as it did at the initial stage of tightening. The packing is compressed and deformed substantially evenly on the left and right sides, and the central part of the inner periphery of the packing bulges out uniformly on the inner periphery, which has the effect of greatly improving the airtightness of the packing.

[Brief explanation of the drawing]

Figure 1 is a cutaway front view of one embodiment of the present invention;
3 and 3 are detailed explanatory views of the main parts, FIG. 4 is a cutaway front view of the conventional embodiment, and FIG. 5 is a detailed explanatory view of the main parts. 12... Wiring port, 14... Captire cable,
15...Patsukin, 16...Stairs, 17...Tanibe, 20
...Tightening nut.

Claims (1)

[Scope of utility model registration request] In order to uniformly bulge the center part of the inner periphery of the packing when tightening the rubber ring-shaped packing that is tightened from both ends, the sloped surface of the longitudinal section of the packing forms a step-like trough in the center of the outer periphery of the packing. The package is characterized in that the step shape of the inclined surfaces on both sides of the valley is formed by shifting the steps asymmetrically from the left and right around the valley of the longitudinal section of the package.