Refractory device for electrical penetration assembly feedthrough

Abstract

The utility model discloses a fire-resistant device for an electrical penetration assembly feed-through line. The fire-resistant device comprises a cable, a ceramic sleeve and a ceramic cover, the cable is provided with at least one wire, and the wire is exposed from one end of the cable and extends; the cable is sleeved with the ceramic sleeve, one end of the ceramic sleeve is a sealed end, the other end of the ceramic sleeve is an open end, the sealed end is in sealing fit with the outer wall of the cable, the wire penetrates out of the open end, and the ceramic sleeve is filled with heat insulation powder; the ceramic cover covers the open end of the ceramic sleeve, and a through hole for the lead to penetrate out is formed in the ceramic cover. According to the utility model, the advantages of fire insulation of ceramic and heat insulation of heat insulation powder are combined, ultra-high temperature fire prevention and fire resistance are realized, and safe and reliable operation of the electrical penetration assembly feed-through line is further ensured; and the ceramic sleeve and the ceramic cover on the outer layer are not combusted and ignited at the same time, so that the potential safety hazard of igniting other articles is avoided. The device is simple in structure, and the construction efficiency and the installation reliability can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a fire-resistant device for an electrical penetration feed-through line. Background Art

[0002] Electrical penetration feedthroughs are used inside and outside the containment of nuclear power plants and on some specific structures. They play the role of transmitting electrical energy and signals, and can also undertake certain mechanical and sealing functions. At present, there are generally two types of electrical penetration feedthroughs. One is to use glass or ceramic materials to sinter the electrical conductors with the external metal shell to form a relatively high-temperature resistant electrical penetration. This type of electrical penetration has a maximum short-term temperature resistance of about 350°C. However, the connector part is not resistant to high temperatures, and the electrical performance of the connector is reduced in the event of a water loss accident. The other is to use a non-metallic material feedthrough plus a metal sealing structure. This type of electrical penetration has a maximum short-term temperature resistance of only about 250°C, and its temperature resistance performance is greatly reduced. The insulation between the wires and the connector sealing performance of the above two types of electrical penetration feedthroughs will fail under high temperature conditions, and cannot meet the requirements of new nuclear power plants to work continuously for 3 hours under fire conditions, and may even result in radioactive leakage. Utility Model Content

[0003] The main purpose of the utility model is to provide a fire-resistant device for an electrical penetration feed-through line, aiming to solve the technical problem that the existing electrical penetration feed-through line cannot be fireproof and fire-resistant at ultra-high temperatures.

[0004] To achieve the above-mentioned purpose, the utility model provides a fire-resistant device for an electrical penetration feedthrough line, comprising:

[0005] A cable, the cable having at least one conductor, and the conductor is exposed and extends from one end of the cable;

[0006] A ceramic sleeve, wherein the ceramic sleeve is sleeved on the outside of the cable, one end of the ceramic sleeve is a sealed end, and the other end is an open end, the sealed end is sealed with the outer wall of the cable, the wire passes through the open end, and the ceramic sleeve is filled with heat insulation powder; and

[0007] A ceramic cover is covered on the open end of the ceramic sleeve and is provided with a through hole for the wire to pass through.

[0008] Optionally, the ceramic sleeve includes a tubular body, the sealing end is arranged at one end of the tubular body, and the sealing end is provided with a through hole for the cable to pass through.

[0009] Optionally, the wall thickness of the tube body is not less than 1.0 mm, and the wall thickness of the ceramic cover is not less than 1.0 mm.

[0010] Optionally, the tube body and the sealing end are an integrally formed structure.

[0011] Optionally, the inner diameter of the perforation is 0.1-0.2 mm larger than the outer diameter of the cable.

[0012] Optionally, the thermal conductivity of the thermal insulation powder is 0.01-0.024 W / m·K, and the specific surface area is 500-1000 m 2 / g.

[0013] Optionally, the thermal insulation powder is an aerogel material.

[0014] Optionally, the sealed end is sealed to the outer wall of the cable by an inorganic adhesive, the ceramic cover is sealed to the wire and the open end by an inorganic adhesive, and the heat-resistant temperature of the inorganic adhesive is not less than 1000°C.

[0015] Optionally, a plurality of air diffusion holes are formed on the ceramic cover, and the plurality of air diffusion holes are evenly distributed around the through hole.

[0016] The fire-resistant device for the electrical penetration feedthrough of the utility model technical solution is divided into a two-layer structure. The outer layer is a ceramic sleeve, which is an inorganic non-combustible material and can withstand high temperatures in the range of 1000-1500°C. The inner layer is a heat-insulating powder, which plays a heat-insulating role. The heat-insulating powder is sealed at the penetration of the cable through the ceramic sleeve and the ceramic cover. This structure combines the advantages of ceramic fire insulation and heat insulation powder insulation to achieve ultra-high temperature fire resistance, thereby ensuring the safe and reliable operation of the electrical penetration feedthrough; and the outer ceramic sleeve and ceramic cover are non-combustible and non-ignitable, eliminating the safety hazard of igniting other items. The device has a simple structure and can improve construction efficiency and installation reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of an embodiment of a fire-resistant device for an electrical penetration feedthrough of the utility model;

[0019] Figure 2 for Figure 1 A partial cross-sectional view along section DD of a fire resistant device for an electrical penetration feedthrough is shown.

[0020] Description of Figure Numbers:

[0021] Label name Label name Label name 10 cable 21 Sealed end 30 Ceramic cover 11 wire 22 Open end 31 Through Hole 20 Ceramic Bushing 23 tube body 32 Air holes

[0022] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0027] The utility model provides a fire-resistant device 100 for electrical penetration feedthroughs, which is applied to where cables penetrate isolators, and is mainly used for fire resistance of electrical penetration feedthroughs in nuclear power plants. It can also be used in other occasions where power cables and accessories require fire prevention and fire resistance.

[0028] The utility model discloses a fire-resistant device 100 for an electrical feed-through, specifically comprising a cable 10, a ceramic bushing 20 and a ceramic cover 30. The cable 10 has at least one conductor 11, and the conductor 11 is exposed and extends from one end of the cable 10. The ceramic bushing 20 is sleeved on the outside of the cable 10, one end of the ceramic bushing 20 is a sealed end 21, and the other end is an open end 22, the sealed end 21 is sealed with the outer wall of the cable 10, the conductor 11 passes through the open end 22, and the ceramic bushing 20 is filled with heat-insulating powder; the ceramic cover 30 covers the open end 22 of the ceramic bushing 20, and the ceramic cover 30 is provided with a through hole 31 for the conductor 11 to pass through.

[0029] The utility model is a fire-resistant device for electrical penetration feed-throughs, which is divided into two layers. The outer layer is a ceramic sleeve 20, which is an inorganic non-combustible material and can withstand high temperatures in the range of 1000-1500°C. The inner layer is a heat-insulating powder, which plays a heat-insulating role. The heat-insulating powder is sealed at the penetration of the cable 10 through the ceramic sleeve 20 and the ceramic cover 30. This structure combines the advantages of ceramic fire insulation and heat insulation powder insulation to achieve ultra-high temperature fire resistance, thereby ensuring the safe and reliable operation of the electrical penetration feed-through; and the outer ceramic sleeve 20 and the ceramic cover 30 are non-combustible and non-ignitable, eliminating the safety hazard of igniting other items. The device has a simple structure and can improve construction efficiency and installation reliability.

[0030] Specifically, the ceramic sleeve 20 includes a cylindrical tube body 23, and the sealing end 21 is arranged at one end of the tube body 23. The sealing end 21 is provided with a through hole for the cable 10 to pass through. It can be understood that the tube body 23 is installed at the through hole, and the cable 10 passes through the tube body 23. The cable 10 is isolated from an insulator such as a wall or a shell by the tube body 23, which can effectively avoid the risk of ignition.

[0031] The inner diameter of the perforation is selected according to different specifications of the cable 10. Specifically, the inner diameter of the perforation is 0.1-0.2 mm larger than the outer diameter of the cable 10 to facilitate installation. The gap can be filled with sealing material to enhance the sealing performance.

[0032] Preferably, the wall thickness of the tube body 23 is not less than 1.0 mm, and the wall thickness of the ceramic cover 30 is not less than 1.0 mm, so as to have both fire resistance and certain mechanical properties and facilitate processing and molding.

[0033] Furthermore, the tube body 23 and the sealing end 21 are an integrally formed structure, which is convenient for processing and molding. During construction, the ceramic sleeve 20 can be directly sleeved on the cable 10, and then the thermal insulation powder can be filled through the open end 22. The construction steps are simple and efficient. The cable fire protection scheme in the prior art often uses ceramic silicone materials, which will burn and easily ignite other items when exposed to fire. The materials of the ceramic cover 30 and the ceramic sleeve 20 of the utility model are both inorganic and resistant to high temperatures. Specifically, they can be made of materials such as aluminum oxide, silicon nitride, zirconium oxide or aluminum nitride. They are non-flammable and will not ignite. When the fire-resistant device is in a fire environment, it can block the flame from entering the interior, eliminating the hidden danger of igniting other items when exposed to fire.

[0034] In order to ensure the thermal insulation performance of the thermal insulation powder, the thermal insulation powder is preferably made of powder material with a low thermal conductivity. Preferably, the thermal conductivity of the thermal insulation powder is 0.01-0.024 W / m·K, and the specific surface area is 500-1000m 2 / g, which can effectively block heat transfer and ensure the normal operation of the internal wire 11. More preferably, the thermal insulation powder is an aerogel material, which is light in weight and has excellent thermal insulation performance.

[0035] In other embodiments, the thermal insulation powder can also be selected from hydrated salt substances, such as a complex of one or more components selected from potassium aluminum sulfate dodecahydrate, magnesium sulfate heptahydrate, calcium chloride hexahydrate, sodium metasilicate pentahydrate, sodium sulfate decahydrate, ferric chloride hexahydrate, sodium carbonate decahydrate, potassium ferric sulfate dodecahydrate, dipotassium hydrogen phosphate heptahydrate, and sodium aluminum sulfate decahydrate.

[0036] The sealed end 21 is sealed to the outer wall of the cable 10 by an inorganic adhesive, and the ceramic cover 30 is sealed to the wire 11 and the open end 22 by an inorganic adhesive. The inorganic adhesive has a temperature resistance range of not less than 1000°C to ensure the overall temperature resistance effect.

[0037] The cable 10 in this embodiment can be a single-core cable or a multi-core cable, and the outer diameter of the tube body 23 is set according to the hole diameter installed at the spacer and other needs.

[0038] In one embodiment, the ceramic cover 30 is provided with a plurality of air diffusion holes 32 for the heat insulation powder to absorb heat and release water vapor when heated. The air diffusion holes 32 can facilitate the water vapor to be dispersed, and the interior of the refractory device can be cooled. Preferably, the plurality of air diffusion holes 32 are evenly distributed around the through hole 31, so as to facilitate uniform heat dissipation in a fire environment to improve heat dissipation efficiency.

[0039] In a specific embodiment, the feed-through line is selected to have a three-core φ1.7mm specification, the wall thickness of the tube body 23 of the ceramic sleeve 20 is 1.0mm, the wall thickness of the ceramic cover 30 is 1.0mm, the outer diameter of the ceramic sleeve 20 is 50mm, and the ceramic sleeve 20 is filled with aerogel powder material according to the new refractory device structure used in the present invention. After assembly, the fire resistant device of this embodiment is tested in accordance with GB / T 19216 Cable integrity test for cables or optical cables under flame conditions, GB / T 19216.11 Cable integrity test for cables or optical cables under flame conditions Part 11: Test device - Single fire supply with flame temperature not less than 750 degrees Celsius; and GB / T19216.21 Line integrity test for cables or optical cables under flame conditions Part 21: Test procedures and requirements - Cables with rated voltage of 0.6 / 1.0kV and below, and GB / T 19216.23 Line integrity test for cables or optical cables under flame conditions Part 23: Test procedures and requirements - Data cables. The test result is that the fire resistance performance test is passed, indicating that the fire resistant device can prevent fire and resist fire under ultra-high temperature and meet the requirement of continuous operation for 3 hours under fire conditions.

[0040] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A fire-resistant device for an electrical penetration feedthrough, characterized in that: include: A cable, the cable having at least one conductor, and the conductor is exposed and extends from one end of the cable; A ceramic sleeve, wherein the ceramic sleeve is sleeved on the outside of the cable, one end of the ceramic sleeve is a sealed end, and the other end is an open end, the sealed end is sealed with the outer wall of the cable, the wire passes through the open end, and the ceramic sleeve is filled with insulation powder, which is an aerogel material or a hydrated salt substance; and A ceramic cover is covered on the open end of the ceramic sleeve and is provided with a through hole for the wire to pass through.

2. The fire-resistant device for electrical penetration feedthroughs according to claim 1, characterized in that: The ceramic sleeve comprises a tubular body, the sealing end is arranged at one end of the tubular body, and the sealing end is provided with a through hole for the cable to pass through.

3. The fire-resistant device for electrical penetration feedthroughs according to claim 2, characterized in that: The wall thickness of the tube body is not less than 1.0 mm, and the wall thickness of the ceramic cover is not less than 1.0 mm.

4. The fire-resistant device for electrical penetration feedthroughs according to claim 2, characterized in that: The tube body and the sealing end are an integrally formed structure.

5. The fire-resistant device for electrical penetration feedthroughs according to claim 2, characterized in that: The inner diameter of the perforation is 0.1-0.2 mm larger than the outer diameter of the cable.

6. The fire-resistant device for electrical penetration feedthroughs according to claim 1, characterized in that: The thermal conductivity of the thermal insulation powder is 0.01-0.024 W / m·K, and the specific surface area is 500-1000 m2 / g.

7. The fire-resistant device for electrical penetration feedthroughs according to claim 1, characterized in that: The sealed end is sealed and connected to the outer wall of the cable through an inorganic adhesive, and the ceramic cover is sealed and connected to the wire and the open end through an inorganic adhesive, and the heat-resistant temperature of the inorganic adhesive is not less than 1000°C.

8. The fire-resistant device for electrical penetration feedthroughs according to claim 1, characterized in that: The ceramic cover is provided with a plurality of air diffusion holes, and the plurality of air diffusion holes are evenly distributed around the through hole.

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