CN211127090U - Anti-siphon oil seepage type shielding oil-blocking ring - Google Patents

Abstract

An anti-siphon oil-seepage type belt shielding oil control ring is characterized in that oil control ring open grooves which axially penetrate through are symmetrically designed on an oil control ring body; the instrument control signal cable core wire penetrates through the oil control ring body, and the sheath of the instrument control signal cable core wire is peeled off by penetrating through part of the oil control ring body; and a shielding cylinder is sleeved outside the oil control ring body.

Description

Anti-siphon oil seepage type shielding oil-blocking ring

Technical Field

The invention relates to the field of thermal detection, in particular to an anti-siphon oil-seepage type shielding oil-blocking ring.

Background

Oil leakage of steam turbine instrument control cables frequently occurs in domestic nuclear power and thermal power generating units, and no method for eradicating oil leakage is found for years.

After years of research, the reason for oil leakage of the cable is that a closed channel is formed between a metal core wire of the cable and a core wire sheath, one end of the cable is immersed in oil, if a forward micro-differential pressure (caused by the reason in the aspect of equipment structure design) exists between an oil side of the cable and a leading-out end of the cable, the oil leaks into a closed pipeline, once the highest point of a cable installation path is crossed, a siphoning effect can be formed, oil stain or oil accumulation phenomenon occurs at the leading-out end of the cable, fire hazard risks are brought, and meanwhile the reliability of thermotechnical measurement is influenced.

After the technical analysis is clear about the oil-seepage mechanism, the invention adopts a certain process treatment on the original cable, and simultaneously, the siphon oil-seepage problem can be solved by the novel oil-stopping ring which is designed in a matching way.

On the premise of ensuring the oil blocking effect, the invention does not increase the secondary termination point of the signal cable, does not influence the signal quality, and considers the cable shielding design.

Disclosure of Invention

The invention aims to: an oil control ring with a shielding function for relieving siphon oil leakage of a signal cable is designed, and the problem of siphon oil leakage of an instrument control signal cable is solved.

The technical scheme of the invention is as follows: an anti-siphon oil-seepage type belt shielding oil control ring is characterized in that oil control ring open grooves which axially penetrate through are symmetrically designed on an oil control ring body; the instrument control signal cable core wire penetrates through the oil control ring body, and the sheath of the instrument control signal cable core wire is peeled off by penetrating through part of the oil control ring body;

the shielding cylinder is sleeved outside the oil control ring body;

and the outer side of the shielding cylinder is sleeved with a heat-shrinkable sleeve, and the heat-shrinkable sleeve is sleeved on the outer layer of the shielding cylinder.

The oil control ring body is made of nitrile rubber.

The oil control ring body is of a cylindrical structure.

The left side and the right side of the shielding cylinder body are respectively fixed with the fastening end A and the fastening end B through the fastening end A.

The invention has the following remarkable effects:

on the premise of not changing the structure of equipment and a sensor, the oil-blocking ring is processed and processed through a signal cable and is designed in a matched mode, the siphon oil seepage problem of the instrument control cable can be solved, and the phenomenon of oil seepage or oil accumulation at the leading-out end of the instrument control cable can be avoided.

Drawings

FIG. 1 is a schematic view of an anti-siphon oil-bleeding type belt-shielding oil control ring.

FIG. 2 is a schematic view of a matched shielding cylinder of an anti-siphon oil-leakage type belt shielding oil-blocking ring.

In the figure: 1. the device comprises an instrument control signal cable core wire, 2. an oil control ring open slot, 3. an oil control ring body, 4. fastening end heads A, 5. a shielding cylinder body and 6. a fastening end head B.

Detailed Description

An anti-siphon oil-leakage type oil-blocking ring with shielding is shown in figure 1. The oil control ring body 3 is made of nitrile rubber and is of a cylindrical structure; the oil control ring body 3 is symmetrically provided with an oil control ring open slot 2 which axially penetrates through; the instrument control signal cable core wire 1 penetrates through the oil control ring body 3, and the instrument control signal cable core wire 1 penetrates through part of the oil control ring body 3 to strip a core wire sheath.

As shown in fig. 2, the shield cylinder 5 is fitted around the outer side of the oil control ring main body 3, and the left and right sides of the shield cylinder 5 are fixed to the fastening head B6 by fastening heads a4, respectively.

The outer side of the shielding cylinder 5 is sleeved with a heat-shrinkable sleeve, the heat-shrinkable sleeve is sleeved on the outer layer of the shielding cylinder 5 for heat-shrinkable protection, and the shielding cylinder 5 is ensured not to be exposed.

The oil control ring designed by the invention supports four-core cables at most and can meet the actual requirements of most fields.

Specification and size: cylindrical, with the specification phi 10 x 50mm, and is made of nitrile rubber. As shown in figure 1.

The specification requirement is as follows: according to the size data in the attached figure 2, four slots are symmetrically arranged in the slotting groove of the nitrile rubber cylinder, and the central angles are separated by 90 degrees. The aperture of the slot is increased near the center, the diameter is about phi 1.5mm circle, the circle center is about 2mm away from the center of the end face circle of the cylinder, the closer the slot is to the edge of the cylinder, the smaller the opening size is, and the shape of the whole slot is bent in the counterclockwise direction.

Design description: the wire groove is used for placing metal core wires of the signal cable to form physical isolation and ensure the insulation effect between the core wires; the caliber of the bottom of the wire groove is larger so as to ensure that a large enough gap is left between the core wire and the nitrile rubber and avoid forming a siphon channel; the open type wire slot is convenient for the metal core wire to pass through, and the core wire is prevented from being cut off and the secondary termination is prevented from being influenced; the wire groove is bent anticlockwise so as to avoid the metal core wire from falling outside the oil-blocking ring. After the core wire is installed, the oil-blocking ring can be rotated at a small angle to better ensure that the core wire stays at the bottom of the wire groove. After the outer layer of the oil control ring is matched with the shielding cylinder, the gap of the wire groove of the oil control ring is compacted, and the positioning of the core wire is also facilitated.

Oil-blocking ring matched shielding cylinder

The specification requirement is as follows: selecting a section of copper tube, wherein the specification size is phi 10.4 x 90 x 0.2mm, performing circular cutting 270 degrees at a position 10mm away from two ends, polishing smoothly, and processing into an end head for fastening. As shown in figure 1.

Design description: the oil-resistant ring is matched with a designed oil-resistant ring for use. On one hand, the wire groove is compacted, the metal core wire is fixed, and the signal cable is supported and protected; on the other hand, the oil-resistant ring plays a role of metal shielding, and metal end heads are provided at two ends and are respectively fixed on the signal cable shielding layer, so that the shielding function of a signal channel is ensured.

Oil-resistant heat-shrinkable sleeve

After the oil control ring and the shielding cylinder are installed, a layer of heat-shrinkable sleeve is packaged on the outermost layer, so that the shielding cylinder is prevented from contacting peripheral metal and other facilities, and the insulating effect of the shielding layer on the ground is ensured.

Claims (4)

1. The utility model provides an anti-siphon oil impregnate type belt shielding oil trap which characterized in that: the oil control ring body (3) is symmetrically provided with an oil control ring open slot (2) which penetrates axially; the instrument control signal cable core wire (1) penetrates through the oil control ring body (3), and the sheath of the core wire is stripped by the instrument control signal cable core wire (1) penetrating through part of the oil control ring body (3);

a shielding cylinder (5) is sleeved on the outer side of the oil control ring body (3);

the outer side of the shielding cylinder (5) is sleeved with a heat-shrinkable sleeve, and the heat-shrinkable sleeve is sleeved on the outer layer of the shielding cylinder (5).

2. The anti-siphon oil-bleeding type belt-shielding oil control ring as set forth in claim 1, wherein: the oil control ring body (3) is made of nitrile rubber.

3. The anti-siphon oil-bleeding type belt-shielding oil control ring as set forth in claim 1, wherein: the oil control ring body (3) is of a cylindrical structure.

4. The anti-siphon oil-bleeding type belt-shielding oil control ring as set forth in claim 1, wherein: the left side and the right side of the shielding cylinder body (5) are respectively fixed with a fastening end B (6) through a fastening end A (4).

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