JPH0629587Y2 - Rubber lip type packing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an improvement of a rubber lip-type packing for a fluid seal used in a joint portion of a pipe member such as a pipe hose.

[Prior Art] Conventionally, as a packing for fluid sealing of a joint portion of a pipe member,
A rubber lip type packing shown in FIGS. 3 and 4 is known.

The lip type packing 1 shown in the same figure is used as a pair, and the whole is made in an annular shape, and the cross section has an outer diameter side surface 1a.
The inner side surface 1b, the upper lip surface 1c, and the lower contact surface 1d are formed into a substantially trapezoidal shape, and the annular recess 2 is formed on the outer periphery of the end of the pipe member 2 for joining them.
When it is loaded into a and both pipe members 2 and 2 are joined, the annular recess 2
In the packings 1 and 1 loaded in a and 2a, the lip surfaces 1c and 1c, which are inclined with respect to the pipe cross section, are butted against each other from the tip end side, and at this time, pushing in the arrow direction shown in FIG. Since it receives pressure, it elastically deforms in a state parallel to the cross section of the pipe, and the lip surfaces 1c, 1c are elastically closely contacted on the entire surface, and the contact surface 1d on the opposite side is elastically close to the bottom surface of the annular recess 2a. , A fluid seal at the joint is formed.

The rubber lip-type packing having the above-mentioned configuration is generally used as a packing for fluid sealing of a pipe member that handles high-pressure fluid, for example, a joint portion of a fire hose or the like.

[Problems to be Solved by the Invention] In the above-mentioned pipe member such as a fire hose, each pipe member is provided with an electrical contact used for fluid flow control and other communication, and the electrical contact is provided at a joint portion of the pipe member. Are connected to form an electric signal system, but if the lip-type packings to be used as a pair can be provided with a function of connecting electric contacts, means for connecting the electric contacts to the pipe member and its additional cost Can be omitted.

[Object of the Invention] The main object of the present invention is to provide a lip-type packing having a function as an electrical contact in addition to a fluid-sealing function as a rubber-type lip-type packing used in a joint portion of a pipe member. Is.

[Means for Solving the Problems] In the present invention, in a rubber lip-type packing for fluid sealing, which is used by being loaded in an annular recess formed in the outer periphery of a joint portion of a pipe member, a lip surface is provided at a required portion of the packing. It is intended to solve the above-mentioned problems by integrally forming a conductive rubber body that comes into contact with each other when brought into contact with each other and is brought into contact with an external terminal provided in the annular recess. .

[Operation] According to the use of the rubber lip-type packing configured as described above, the packing is loaded in the annular recess on the outer periphery of the pipe member,
When the pipe members are joined, a pair of butted packings form a fluid seal at the joint portion, and at the same time, the conductive rubber body functions as an electrical contact to form an electrical signal system.

[Embodiment] FIGS. 1 and 2 show an embodiment of the present invention, in which the same or similar members as those in FIGS. 3 and 4 are designated by the same reference numerals.

That is, 1 is a rubber lip-type packing, and a conductive rubber body is integrally provided on this packing. This conductive rubber body includes a conductive rubber layer portion 1e provided in an embedded shape over the outer diameter side surface 1a and the lip surface 1c of the packing, and a conductive rubber portion integrally protruding from the conductive rubber layer portion of the outer diameter side surface 1a. It is formed with the protrusion 1f. The conductive rubber protrusion 1f may be continuous or discontinuous with respect to the entire circumference of the packing.

The insulating packing body excluding the conductive rubber body is made of silicon rubber, fluorosilicone rubber, EPDM, neoprene, NBR, S
A relatively soft rubber material such as BR is used.

On the other hand, the conductive rubber body contains Au, Ag, Ni, Cu as the rubber material.
Metal powders such as the above, inorganic particles plated with these, or those filled with inorganic fibers are used.

The lip-type packing having the conductive rubber body is, for example, an unvulcanized rubber compound of either the insulating rubber part or the conductive rubber part is put into a mold and primary-molded by hot pressing, and the primary It can be easily obtained by putting the molded part and another unvulcanized rubber compound in a mold and integrally molding.

The inner surface of the annular recess 2a on the outer periphery of the tubular member 2 in which the rubber lip-type packing is loaded is lined with an insulating material 2b, and the outer lead wire 3 is provided on the inner surface of the outer peripheral wall 2c forming the annular recess 2a. A terminal 4 is provided, and the projection 1f of the conductive rubber body can be brought into contact with it.

FIG. 2 shows an initial state in which the lip-type packing 1 is loaded in the outer peripheral annular recess 2a of the pipe member 2, and in this state, the conductive rubber protrusion 1f is forced into the recess 2a. Although it is pushed in and deformed, the lip surfaces 1c, 1c of the packing are butted against each other by the joining of the pipe members, and when the pressing force in the direction of the arrow (see FIG. 2) is received, the outer diameter side surface 1a of the packing is annularly recessed 2 Since it deforms away from the outer peripheral wall 2c, the conductive rubber protrusion 1f is
As shown in the figure, it returns to its original shape and contacts the terminal 4 on the inner surface of the outer peripheral wall 2c.

Therefore, by using the lip-type packing having the above-mentioned conductive rubber body, the electrical contact is connected at the same time as the fluid seal at the joint portion of the pipe member.

The shape of the conductive rubber body is not limited to the illustrated example, and can be arbitrarily changed within a range in which the intended purpose can be achieved.

[Effects of the Invention] As described above, according to the present invention, since the conductive rubber body is integrally provided on the lip-type packing, in addition to the fluid sealing function of the joint portion of the pipe member, the electrical contact is provided. Can function as. Therefore, according to the use of the lip-type packing of the present invention, it is not necessary to provide a connecting member for the electrical contact on the pipe member, so that the cost can be saved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a rubber lip-type packing used in one embodiment of the present invention, FIG. 2 is a cross-sectional view of the lip-type packing in an initial state loaded in a pipe member, and FIG. FIG. 4 is a vertical cross-sectional view of the rubber lip-type packing in a used state, and FIG. 4 is a cross-sectional view of the packing in the initial state loaded on the pipe member. 1 ... Lip type packing, 1a ... Outer diameter side surface, 1b ...
Inner diameter side surface, 1c ... lip surface, 1d ... contact surface, 1e ...
Conductive rubber layer, 1f Conductive rubber protrusion, 2 ...
Tube member, 2a ... annular recess, 2c ... outer peripheral wall, 3 ... external lead wire, 4 ... terminal.

Claims (1)

[Scope of utility model registration request] 1. A rubber lip-type packing for fluid sealing, which is used by being loaded in an annular recess formed on the outer periphery of a joint portion of a pipe member, and is brought into contact with a required portion of the packing when the lip surfaces are butted against each other. The rubber lip-type packing is characterized in that a conductive rubber body that is in contact with an external terminal provided in the annular recess and conducts electricity is integrally provided.