CN111322406A - A kind of sealing oil separation structure and method for unit instrument signal wire - Google Patents

Abstract

The invention discloses a sealing oil separation structure for a unit instrument signal wire, wherein a wire leading-out hole is formed in the outer wall of a unit, a protection tube is arranged between the wire leading-out hole and an instrument field explosion-proof junction box, the protection tube is provided with a section of vertical tube, and the unit instrument signal wire extends out of the wire leading-out hole, penetrates through the protection tube and is connected to an instrument main control wire in the instrument field explosion-proof junction box; a sealing structure is arranged between the signal wire of the unit instrument and the vertical pipe, and comprises a rubber plug and a sealing adhesive layer; the horizontal position of the central axis of the lead wire leading-out hole is lower than that of the lower end of the sealing structure. The invention also provides a sealing oil separation method for the signal wire of the unit instrument. The invention has reasonable structure, easily obtained materials, convenient assembly and disassembly of parts and can be repeatedly used.

Description

A kind of sealing oil separation structure and method for unit instrument signal wire

technical field

The invention belongs to the field of installation and connection of instrumentation probes of a unit, and in particular relates to a sealing oil-separating structure and method for signal wires of instrumentation of a unit.

Background technique

In modern refining and chemical plants, various large-scale units are often the core equipment. In order to ensure the safe operation of the unit, a large number of various instrument measuring probes are usually designed to monitor the operating status of the unit in real time, so that the operator can analyze and judge the operation of the unit. At present, all kinds of instrument probes used by the unit are in contact with the lubricating oil system. Due to the complicated installation methods of various instrument probes, they are restricted by the on-site installation conditions of the unit. The conventional sealing method usually seals near the lead-out point of the bearing box of the unit, which is very prone to lubricating oil seepage and oil leakage. On the one hand, this phenomenon causes the loss of lubricating oil and the deterioration of the on-site environment. On the other hand, if there is a high temperature medium near the leakage point of the lubricating oil, fire and other safety accidents are very likely to occur, resulting in huge economic losses and serious social impacts.

When the traditional unit instrument signal wire is led out from the vicinity of the unit bearing box, it is usually fixed and sealed by smearing glue at the lead out of the bearing box to prevent the leakage of lubricating oil inside the unit. This method is affected by the cleanliness of the sealing surface, the offset of the sealing position of the sealing gasket, the sealing uniformity of the sealant, and the high temperature due to the proximity of the unit body, and the direct impact of the lubricating oil on the sealing point and other harsh environments and conditions. Complete seal against lubricating oil.

Invention content:

The purpose of the present invention is to provide a sealed oil separation structure for the signal wire of the unit instrument, which can solve the problem of preventing the leakage of lubricating oil from the outlet of the signal wire of the unit bearing box and the instrument, so as to overcome the problems existing in the background technology.

In order to achieve the above object, the technical scheme of the present invention is:

A sealed oil-separating structure for the signal wire of the unit instrument. The outer wall of the unit is provided with a wire lead-out hole, and a protection pipe is arranged between the wire lead-out hole and the explosion-proof junction box on the instrument site. The signal wire extends from the wire lead-out hole through the protection tube and is connected to the main control wire of the instrument in the explosion-proof junction box of the instrument site; a sealing structure is provided between the signal wire of the unit instrument and the vertical standpipe, and the sealing structure includes a rubber plug and a sealant layer ; The horizontal position of the central axis of the wire lead-out hole is lower than the horizontal position of the lower end of the sealing structure.

Preferably, the protection tube is a Z-shaped tube.

Preferably, the protection tube includes a hot-dip galvanized hexagonal outer wire, a hot-dip galvanized inner wire bend, an upright standpipe, an instrument explosion-proof threading bend and an instrument, which are arranged in sequence from the lead-out hole of the connecting wire to the explosion-proof junction box of the connection instrument. Explosion-proof flexible connecting pipe.

Preferably, the upright standpipe is a hot-dip galvanized outer wire short wire.

Preferably, the rubber plug is a round-shaped oil-resistant rubber plug, the center of the rubber plug is provided with a through hole for the instrument signal wire of the unit to pass through, and the rubber plug forms a tight fit between the inner wall of the upright standpipe and the outer wall of the instrument signal wire of the unit. structure.

Preferably, the maximum diameter of the rubber plug is larger than the inner diameter of the upright standpipe, and the diameter of the through hole is smaller than the maximum diameter of the instrumentation signal wire of the unit.

Preferably, a cast-molded sealant layer is provided above the rubber stopper.

Preferably, the thickness of the sealant layer is 6-10mm.

The invention also provides a sealing oil separation method for the instrument signal wire of the unit, which is provided with a wire lead-out hole on the outer wall of the unit:

A protective tube is set between the wire lead-out hole and the explosion-proof junction box on the instrument site;

Make a section of the protection pipe an upright standpipe;

Extend the instrument signal wire of the unit from the wire lead-out hole and connect it to the main control wire of the instrument in the explosion-proof junction box on the instrument site through the protection tube;

Set up a sealing structure between the signal wire of the unit's instrumentation and the vertical standpipe;

Make the horizontal position of the lower end of the sealing structure higher than the horizontal position of the central axis of the wire lead-out hole.

Preferably, the sealing structure includes a rubber plug and a sealant layer;

A rubber stopper is arranged in the upright standpipe, and a through hole is arranged in the center of the rubber stopper, and the signal wire of the group instrument is passed through the through hole;

Make the rubber plug form a tight fitting structure between the inner wall of the upright standpipe and the outer wall of the instrument signal wire of the unit;

Pour the sealant on the top of the rubber stopper. After the sealant is cured to form a sealant layer, the curing time is not less than 24 hours.

The beneficial effect of the invention is that: by utilizing the self-flow characteristics of the oil-resistant rubber plug processed into a circular cone type and the liquid oil-resistant sealant, on the basis of not changing the original installation mode of the instrument, the connection between the rubber plug and the sealant to the instrument wire and the metal protection tube can be realized. It is completely sealed between them, so as to completely solve the problem of lubricating oil leakage.

The invention does not change the installation type of the unit instrument; the static sealing point of the instrument wire is moved from the bearing box of the unit to the vertical pipe of the "Z" type instrument wire metal protection pipe, and the sealing section of the vertical pipe is higher than the outlet of the instrument wire of the unit bearing box. Features, so that the lubricating oil and oil mist condensate entering the metal protection tube of the "Z" type instrument wire can flow back to the bearing box of the unit, changing the common sealing method requires isolation of lubricating oil and lubricating oil mist, only the lubricating oil mist needs to be isolated The required sealing requirements can be achieved.

The invention utilizes liquid oil-resistant sealant to penetrate and fill to eliminate air and gaps, combined with the extrusion sealing function of the round-shaped oil-resistant rubber plug, and double-layer sealing to completely solve the problem of leakage of lubricating oil for the signal wires of the unit instrumentation; the invention has a reasonable structure, Materials are readily available, components are easily disassembled and reusable.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention,

FIG. 2 is a schematic cross-sectional structure diagram of an embodiment of the present invention.

In the picture: 1. Unit instrument signal wire, 2. Conductor lead-out hole, 3. Hot-dip galvanized hexagonal outer wire, 4. Hot-dip galvanized inner wire bend, 5. Upright standpipe, 6. Instrument explosion-proof threading bend, 7 , The instrument explosion-proof flexible connecting pipe, 8, the instrument site explosion-proof junction box, 9, the rubber plug, 10, the sealant layer, 11, the outer wall of the unit.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

Example 1

A sealed oil-separating structure for the instrument signal wire 1 of the unit. The outer wall 11 of the unit is provided with a wire lead-out hole 2, and a protection tube is provided between the wire lead-out hole 2 and the explosion-proof junction box 8 on the instrument site, and the protection tube has a vertical section. Standpipe 5, the unit instrument signal wire 1 extends through the protection tube from the wire lead-out hole 2 and is connected to the instrument main control wire in the explosion-proof junction box 8 on the instrument site; there is a seal between the unit instrument signal wire 1 and the upright standpipe 5 Structure, the sealing structure includes a rubber plug 9 and a sealant layer 10.

The protection tube is a Z-type metal protection tube.

The protection tube includes hot-dip galvanized hexagonal outer wire 3, hot-dip galvanized inner wire bend 4, upright standpipe 5, and instrument explosion-proof threading bend 6, which are arranged in sequence from the lead-out hole 2 of the connecting wire to the explosion-proof junction box 8 connected to the instrument site. And the instrument explosion-proof flexible connecting pipe 7.

The upright standpipe 5 is a hot-dip galvanized outer short wire.

The rubber plug 9 is a circular truncated oil-resistant rubber plug 9. The center of the rubber plug 9 is provided with a through hole for the instrument signal wire 1 of the unit to pass through. Form a tight fit structure.

The maximum diameter of the rubber plug 9 is larger than the inner diameter of the upright vertical pipe 5 , and the diameter of the through hole is smaller than the maximum diameter of the signal wire 1 of the unit instrumentation.

The top of the rubber plug 9 is provided with a cast-molded sealant layer 10 .

The thickness of the sealant layer 10 is 6-10mm.

The horizontal position of the central axis of the wire lead-out hole 2 is lower than the horizontal position of the lower end of the sealing structure.

As shown in Figure 1, the sealing and oil separation structure of the instrument signal wire 1 of the unit of the present invention is as follows: the instrument signal wire passes through the instrument wire lead-out hole 2 of the unit shell, passes through the hot-dip galvanized hexagonal outer wire 3 and the hot-dip galvanized inner wire to bend Pass 4, hot-dip galvanized outer wire short wire, instrument explosion-proof threading bend 6, instrument explosion-proof flexible connecting pipe 7 enters the instrument site explosion-proof junction box 8 and connects with the main control wire of the instrument from the control system.

The "Z"-shaped protective tube structure consisting of hot-dip galvanized hexagonal outer wire 3, hot-dip galvanized inner wire bend 4, hot-dip galvanized outer wire short wire, and instrument explosion-proof threading bend 6 must include a section of upright vertical pipe 5 ( In Figure 2, it is hot-dip galvanized outer wire short wire), the method of the present invention needs to use this section of upright vertical pipe 5 to achieve the final sealing function.

The long diameter of the round cone-shaped oil-resistant rubber plug 9 should be 1-2mm larger than the inner wall diameter of the hot-dip galvanized outer wire short wire.

When installing the circular oil-resistant rubber plug 9, ensure that the long diameter faces upwards. After installation, ensure that its outer diameter is in line with the inner wall of the hot-dip galvanized outer wire short wire. tightly combined.

Embodiment 2

A method of sealing and separating oil for the signal wire 1 of the instrumentation of the unit, the outer wall 11 of the unit is provided with a wire lead-out hole 2:

A protective tube is arranged between the wire lead-out hole 2 and the explosion-proof junction box 8 on the instrument site;

Make a section of the protection pipe an upright standpipe 5;

Extend the instrument signal wire 1 of the unit from the wire lead-out hole 2, and connect it to the main control wire of the instrument in the explosion-proof junction box 8 on the instrument site through the protection tube;

A sealing structure is arranged between the unit instrumentation signal wire 1 and the upright standpipe 5;

Make the horizontal position of the lower end of the sealing structure higher than the horizontal position of the central axis of the wire lead-out hole 2 .

The sealing structure includes a rubber plug 9 and a sealant layer 10;

A rubber plug 9 is arranged in the upright vertical pipe 5, a through hole is arranged at the center of the rubber stopper 9, and the signal wires of the group instrument are passed through the through hole;

Make the rubber plug 9 form a tight fitting structure between the inner wall of the upright standpipe 5 and the outer wall of the unit instrument signal wire 1;

The sealant is poured over the rubber plug 9, and the sealant layer 10 is formed after the sealant is solidified.

As shown in Figure 2, the method for sealing and oil separation of the instrument signal wire 1 of the unit of the present invention is: through hot-dip galvanized hexagonal outer wire 3, hot-dip galvanized inner wire bend 4, hot-dip galvanized outer wire short wire and instrument explosion-proof threading bend Pass 6 to form a "Z"-shaped protective tube structure, the instrument signal wire passes through the vertical pipe section installed in the "Z"-shaped structure (hot-dip galvanized inner wire bend 4, hot-dip galvanized outer wire short wire and instrument explosion-proof threading bend through 6) in the circular cone-shaped oil-resistant rubber plug 9, pour liquid oil-resistant sealant above it. The oil-resistant sealant can penetrate and fill the air and gap between the circular cone-shaped oil-resistant rubber plug 9 and the instrument signal wire and the inner wall of the hot-dip galvanized outer wire short wire in the liquid state. sealing effect.

Ensure that the oil-resistant sealant has a curing time of not less than 24 hours. During the curing period, the sealant cannot contact the grease. The thickness after curing should be between 6-10mm. If it is too thin, the sealing effect will not be achieved. Too thick may cause Oil resistant sealants do not cure ideally internally.

The round table oil-resistant rubber plug 9 is soft in material, and the oil-resistant sealant is liquid before curing. It can well adapt to the material and size changes of various types of instrument signal wires, and can meet the sealing requirements under various installation conditions.

The applicant used the present invention to transform 36 temperature probes and 12 displacement probes of the three units of the catalytic cracking unit. 6 new "Z" type instrument wire metal protection tube structures are added in the on-site reconstruction. According to this method, the instrument wire is passed through the round cone-shaped oil-resistant rubber plug 9, and then the liquid oil-resistant sealant is used to infiltrate and fill the sealing surface in the liquid state. At all places, the effect of complete sealing is achieved, and the long-term use effect is good.

The sealing oil separation method of the instrument signal wire 1 of the unit of the present invention has the following advantages:

(1) There is no change to the original installation method and requirements of the instrument of the unit.

(2) Using the original design of the instrument signal wire lead-out interface of the unit, the direction of the instrument wire outside the unit does not need to be changed.

(3) Innovatively design a new "Z"-type protection pipe structure including an upright standpipe 5, and move the seal of the casing outlet, which is easy to cause oil leakage, to the upright standpipe 5 of the "Z"-type protection pipe structure, Thereby creating conditions for a complete solution to the leakage of lubricating oil.

(4) Innovative use of the liquid impregnation and filling of the sealant, applied to the sealing operation, the oil-resistant sealant 10 can self-flow fill the sealing surface in the liquid state, and form a certain thickness of sealing layer after solidification, so as to achieve complete sealing Effect

(5) Make full use of the change of the upper and lower diameters of the circular cone-shaped oil-resistant rubber plug 9, so that the oil-resistant rubber plug 9 and the inner wall of the hot-dip galvanized outer short wire are closely attached, and the initial sealing effect is good.

(6) The circular cone-shaped oil-resistant rubber plug 9 is used for the first time and the oil-resistant sealant is used for final sealing, and the double-layer sealing makes the sealing effect more reliable and effective.

(7) The round cone-shaped oil-resistant rubber plug 9 is soft and easy to assemble and disassemble, and can be used repeatedly.

It should be understood that, for those skilled in the art, improvements or changes can be made according to the above description, and all these improvements and changes should fall within the protection scope of the appended claims of the present invention. The parts not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims (10)

1. The utility model provides a sealed oil removal structure for unit instrument signal conductor which characterized in that: a wire leading-out hole (2) is formed in the outer wall (11) of the unit, a protection tube is arranged between the wire leading-out hole (2) and the instrument on-site explosion-proof junction box (8), the protection tube is provided with a section of vertical tube (5), and a unit instrument signal wire (1) extends out of the wire leading-out hole (2) and penetrates through the protection tube to be connected to an instrument main control wire in the instrument on-site explosion-proof junction box (8); a sealing structure is arranged between the unit instrument signal wire (1) and the vertical pipe (5), and the sealing structure comprises a rubber plug (9) and a sealing adhesive layer (10); the horizontal position of the central axis of the lead leading-out hole (2) is lower than the horizontal position of the lower end of the sealing structure.

2. The structure of claim 1, wherein the structure comprises: the protection tube is a Z-shaped tube.

3. The structure of claim 1, wherein the structure comprises: the protection tube comprises a hot galvanizing hexagonal outer wire (3), a hot galvanizing inner wire elbow (4), an upright vertical tube (5), an instrument explosion-proof threading elbow (6) and an instrument explosion-proof flexible connecting tube (7) which are sequentially arranged from the connection of the lead leading-out hole (2) to the connection of the instrument on-site explosion-proof junction box (8).

4. The structure of claim 1 or 2, wherein the structure comprises: the vertical tube (5) is a hot galvanizing external short wire.

5. The structure of claim 1, wherein the structure comprises: rubber buffer (9) are round platform type resistant oil rubber buffer (9), the through-hole that supplies unit instrument signal conductor (1) to pass is seted up at the center of rubber buffer (9), rubber buffer (9) are in the inner wall of vertical riser (5) with form the tight fit structure between the outer wall of unit instrument signal conductor (1).

6. The structure of claim 5, wherein the structure comprises: the maximum diameter of rubber buffer (9) is greater than the internal diameter of vertical standpipe (5), the diameter of through-hole is less than the maximum diameter of unit instrument signal conductor (1).

7. The structure of claim 1, wherein the structure comprises: and a pouring-molded sealing adhesive layer (10) is arranged above the rubber plug (9).

8. The structure of claim 1 or 7, wherein the structure comprises: the thickness of the sealant layer (10) is 6-10 mm.

9. The utility model provides a sealed oil removal method for unit instrument signal wire, is equipped with wire lead-out hole (2) at unit outer wall (11), its characterized in that:

a protection tube is arranged between the lead leading-out hole (2) and the instrument field explosion-proof junction box (8);

-making one of the protective tubes an upright riser (5);

extending a unit instrument signal wire (1) out of the wire leading-out hole (2), penetrating the protection tube and connecting the wire to an instrument main control wire in an instrument field explosion-proof junction box (8);

a sealing structure is arranged between the unit instrument signal conductor (1) and the vertical pipe (5);

the horizontal position of the lower end of the sealing structure is higher than the horizontal position of the central axis of the lead-out hole (2).

10. The method for sealing and isolating oil for the instrument signal wire of the unit according to claim 9, wherein the method comprises the following steps: the sealing structure comprises a rubber plug (9) and a sealing glue layer (10);

a rubber plug (9) is arranged in the vertical pipe (5), a through hole is formed in the center of the rubber plug (9), and the group instrument signal conductor penetrates through the through hole;

enabling the rubber plug (9) to form a tight fit structure between the inner wall of the vertical pipe (5) and the outer wall of the unit instrument signal wire (1);

pouring a sealant above the rubber plug (9), and curing the sealant to form a sealant layer (10), wherein the curing time is not less than 24 hours.

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