JPH0419939Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a conduit sealing device that seals between a conduit and a cable inserted into the conduit and prevents the flow of any liquid or gas. It is.

(Prior art) Conventionally, sealing between a conduit and a cable involves
As shown in Utility Model Publication No. 55-52750, one end of the cylindrical packing is inserted into the end of the conduit or a threaded tube connected thereto, and a soft rubber O is attached to the other end of the cylindrical packing. A sealing device is used in which a cap nut is screwed together, which abuts the ring and pressurizes the O-ring to the end of the conduit and the outer wall of the cable via a washer.

(Problem to be solved by the invention) However, in the conventional sealing device, the washer is rotated by the tightening of the cap nut, that is, the rotation of the cap nut, and the O-ring is rotated by the rotation of the washer. However, this poses a problem in that the cable into which the O-ring is inserted is twisted.

This invention aims to solve the above problems and provides a conduit sealing device that can reliably seal the conduit and prevent the cable from twisting during sealing.

(Means for solving the problem) That is, in this invention, one end of a cylindrical packing is fitted into the end of a threaded conduit tube or a threaded tube connected thereto, and the other end of the cylindrical packing is fitted with a threaded conduit. , a conduit sealing device in which an O-ring is disposed, and a cap nut for tightening and pressurizing the O-ring is screwed into the threaded conduit end or the threaded conduit end connected thereto via a washer. The washer is characterized in that a protrusion that engages with the O-ring is provided on the contact surface of the washer with the O-ring.

Note that the number and shape of the protrusions provided on the washer are not particularly limited as long as they can engage with the O-ring. However, in order to prevent rotation of the O-ring, it is desirable to provide the protrusions at equal intervals.

(Function) According to this invention, the protrusion of the washer engages with the O-ring and the two are integrated, so even when tightening the cap nut, the cap nut and the washer are in contact with each other from the beginning. Sliding occurs on the surface and a state of low friction is maintained. Therefore, the O-ring is prevented from rotating as the cap nut rotates.
After tightening the cap nut, the end of the conduit is sealed with an O-ring, providing excellent watertightness and airtightness.

(Example) An embodiment of this invention will be described below.

One end of a cylindrical packing 2 made of hard rubber is fitted inside one end of the electric conduit 1. The other end of this cylindrical packing 2 is provided with annular flanges 3 and 4 that protrude inward and outward, and the outer wall of the cylindrical packing is provided with a tapered portion 2a having a larger diameter on the flange side. Formed to dimensions that fit closely with the inner wall of the conduit,
The annular collar portion 3 abuts against the end surface of the electrical conduit. A soft rubber O-ring 5 is attached to the outside of the annular collar portions 3 and 4.
(the inner diameter is approximately equal to the outer diameter of the cable 6) are brought into contact with each other, a cap nut 8 is fitted through the washer 7, and the cap nut 8 is screwed onto the threaded portion of the electrical conduit 1. The washer 7 has three protrusions 7a provided at equal intervals on the contact surface with the O-ring 5.
The washer 7 is engaged with the O-ring 5 by biting into the O-ring 5. Therefore, the O-ring 5 and the washer 7 are integrated.

In the above, although the cylindrical packing 2 is made of hard rubber, the flange is slightly deformed by screwing the cap nut to maintain airtightness with the end surface of the conduit, and the O-ring is not deformed by pressure. In this case, it is preferable that the hardness is sufficient to withstand the pressure. In the embodiment described above, when the cap nut 8 is screwed in, the O-ring 5 and the washer 7 do not rotate as a unit, but slippage occurs between the inner surface of the cap nut 8 and the washer 7, and this state This is maintained until the tightening of the cap nut is completed. By tightening, the O-ring deforms from the state shown in FIG. 1 to the state shown in FIG. 2, and can reliably seal the contact surface with the outer wall of the cable 6, the inner wall of the cap nut 8, and the annular collar. . Further, since the outer wall of the cylindrical packing and the annular flange come into close contact with the abutting portion of the end of the conduit, the end of the conduit and the cable are ultimately sealed. Next, FIG. 4 shows an embodiment in which no screw thread is provided in the conduit. In this case, instead of providing a thread, a joint fitting with a thread is used. That is, a connection tube 9 is attached to one end of the conduit 1.
and a screw tube 1 that screws into this to tighten the packing.
0 fittings are fitted. A threaded portion 9a is provided on the inner wall of one end of the connecting tube 9, and a rubber packing 1 having an inner diameter approximately equal to the outer diameter of the conduit 1 is provided.
Insert 1. A conduit 1 is connected to the other end of the connection tube 9.
If the threaded tube 10 is screwed onto the threaded part 9a having the threaded part 12a with an outer diameter approximately equal to , and the rubber packing 11 is pressurized, the rubber packing will come into close contact with the conduit wall and the connection part can be kept airtight. can. Therefore, the cylindrical packing 2 is fitted into the screw tube 12 in the manner shown in FIG.
By arranging the ring 5, further arranging the washer 7 having the protrusion 7a, and tightening and screwing the cap nut 8, it is possible to reliably seal the end of the screw tube and the cable, and also to tighten the cap nut 8. At this time, since rotation of the O-ring is prevented as in the previous embodiment, twisting of the cable can be prevented.

In both of the above embodiments, the annular enlarged part was formed by the annular flange of the cylindrical packing and the O-ring, but the point is that the flange only needs to come into airtight contact with both the conduit and the cable. It is also possible to integrally mold the O-ring and the O-ring.

(Effect of the invention) As explained above, according to this invention, at the end of the threaded conduit or the end of the threaded pipe body connected thereto,
A cap nut is screwed together so as to pressurize the O-ring through the washer, and a protrusion that engages with the O-ring is provided on the contact surface of the washer with the O-ring.
The cap nut can be tightened without rotating the ring, and the end of the conduit tube can be reliably sealed without twisting the cable.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view showing an embodiment of this invention before tightening, Fig. 2 is a sectional view of the same in the tightened state, and Fig. 3 is a perspective view of the washer.
FIG. 4 is a partial sectional view of another embodiment using a joint fitting. 1... Electric conduit, 2... Cylindrical packing, 3, 4
. . . Annular flange, 5 .

Claims (1)

[Claims for Utility Model Registration] One end of a cylindrical packing is fitted into the end of a threaded conduit tube or a threaded pipe connected thereto, and an O-ring is disposed at the other end of the cylindrical packing. In the conduit sealing device, a cap nut for tightening and pressurizing an O-ring is screwed into the end of the threaded conduit or the end of the threaded conduit connected thereto via a washer, and the washer includes: O on the contact surface with the O-ring.
A conduit sealing device characterized by being provided with a protrusion that engages with a ring.