Self-hydrophobic isolation transformer box of airport navigation aid lamp

Abstract

The utility model discloses a self-hydrophobic isolation transformer box of an airport navigation aid lamp. The device comprises a box cover, a box body, an O-shaped sealing ring, a one-way waterproof breathable film, a bimetallic strip one-way drain valve, a side metal cable waterproof joint, a bottom metal cable waterproof joint and an insect-proof and antifouling one-way drain device. The bimetallic strip one-way drain valve and the insect-proof and antifouling one-way drain device used in the utility model can avoid the repeated operation of manual water removal, realize the automatic discharge of water accumulated at the bottom in the box body, reduce the air humidity in the box body, and ensure the insulation condition of a loop; opening maintenance of the box cover and replacement operation of opening the sealant to dig out the cable are reduced, and unnecessary cost and expense are saved. The problems of ponding in the isolation transformer box and incapability of meeting airworthiness requirements due to long maintenance time caused by damage of the isolation transformer box are solved, so that the stability of airport navigational lighting facilities is ensured, and the operation safety of aircrafts is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of airport special equipment, and particularly relates to an isolation transformer box of an airport navigation lamp which can be self-drained. Background Art

[0002] The five-year development plan for the start of the multi-field civil aviation power construction has put forward higher standards and requirements for the stability of navigation facilities and systems during airport operation and maintenance, and has also posed challenges to the maintenance costs of airport operation facilities. For airports, the safe takeoff and landing of each aircraft cannot be separated from the safe and correct guidance provided by visual navigation facilities. Among them, navigation lights provide the necessary visual guidance during the aircraft approach and landing, ground taxiing, etc. The airport uses a navigation lighting system to provide lighting guidance to ensure the safe and smooth operation of civil aviation aircraft.

[0003] In the navigation lighting system, the isolation transformers and cable connectors of the airport navigation lighting are all placed in sealed boxes on the earth surface area of ​​the lifting belt to prevent the isolation transformers from being soaked by rainwater or the cables and other facilities and equipment from being damaged by external mechanical means, and most of them rely on imports. However, at present, even if the isolation transformer box has good sealing performance, there is still widespread water accumulation due to factors such as condensation and breathing effect, which has a great impact on the insulation resistance value of the circuit of the navigation lighting system, resulting in the safety hazard of insufficient insulation performance of the isolation transformer, thereby accelerating the aging of the isolation transformer, cables and connectors. During the rainy season and flood season, the water accumulation in the isolation transformer box of the airport navigation lighting is more serious, the insulation resistance value is reduced and grounding faults occur from time to time, and the problems of cumbersome construction and long maintenance cycle have posed greater challenges to the airworthiness requirements.

[0004] At present, domestic airports still use the traditional method of opening the box to drain the accumulated water for maintenance, which is inefficient and complicated to deal with manually. Therefore, in order to ensure the safety of airport operations, measures need to be taken to deal with and control the accumulated water in the isolation transformer box of the navigation lighting, so that the inside of the box is kept dry to ensure the safety and stability of the airport navigation lighting system. However, no such products have been found so far. Summary of the invention

[0005] In order to solve the above problems, the purpose of the utility model is to provide an isolation transformer box for airport navigation lights that can be self-drained.

[0006] In order to achieve the above-mentioned purpose, the utility model provides an isolation transformer box for airport navigation lights that can drain water by itself, including a box cover, a box body, an O-ring, a one-way waterproof and breathable membrane, a bimetallic one-way drain valve, a side metal cable waterproof joint, a bottom metal cable waterproof joint and an insect-proof and anti-fouling one-way drain device; wherein the upper end of the box body is open, buried at the junction of the shoulder and the soil area around the airport runway and fixed by pouring concrete around it, a side metal cable waterproof joint is provided on the side wall, two bottom metal cable waterproof joints are provided on the outer part of the bottom surface, and an insect-proof and anti-fouling one-way drain device is provided in the middle of the bottom surface; the box cover covers the upper end opening of the box body, is flush with the height of the shoulder, an opening for installing the one-way waterproof and breathable membrane is formed in the middle, and the edge part is fixed to the upper port of the box body in a detachable manner by bolts; the bimetallic one-way drain valve is installed on the lower side of the one-way waterproof and breathable membrane; the O-ring is arranged on the inner edge of the upper port of the box body to ensure that the box cover is tightly connected to the box body.

[0007] The box cover and the box body are both made of cast iron or aluminum alloy.

[0008] The one-way waterproof and breathable membrane is made of expanded polytetrafluoroethylene film and polypropylene material.

[0009] The bimetallic one-way steam trap comprises a temperature sensing element auxiliary plate, a bimetallic temperature sensing element, a spring, a valve core, a valve and an adjusting rod; wherein the water vapor inlet of the valve is located at the lower end, the water vapor outlet is located at the upper end, and an adjusting rod is vertically arranged in the middle of the inside; multiple groups of bimetallic temperature sensing elements are nested in the lower part of the adjusting rod and are formed as a whole by using the temperature sensing element auxiliary plates around them; a spring is sleeved on the outer side of the lower part of the adjusting rod; the spring end is fixed to the upper part of the adjusting rod, and the lower end is fixed to the upper end of the temperature sensing element auxiliary plate; the valve core is fixed to the upper end of the adjusting rod.

[0010] The model of the side metal cable waterproof connector is M20×1.5, and the model of the bottom metal cable waterproof connector is M25×1.5.

[0011] The insect-proof and anti-fouling one-way hydrophobic device includes permeable stones, a ground drainage device, an anti-seepage water membrane and a protective device, wherein the protective device is a screw-type shell structure, both the upper and lower ends are open, and the upper end is fixed to the bottom surface of the box body; the ground drainage device is installed on the inner upper part of the protective device; the anti-seepage water membrane and the permeable stone are sequentially covered on the top surface of the ground drainage device.

[0012] The anti-penetration water membrane is made of high-density polyethylene material.

[0013] The bimetallic one-way drain valve and insect and anti-fouling one-way drain device used in the isolation transformer box of the airport navigation lighting fixture that can drain water can avoid repeated manual water removal operations, realize automatic drainage of water accumulated at the bottom of the box, reduce air humidity in the box, ensure the insulation of the circuit, reduce the opening and maintenance of the box cover and the replacement of the cable by opening the sealant, and save unnecessary expenses and costs. The problem of water accumulation in the isolation transformer box and the long maintenance time due to damage to the isolation transformer box that cannot meet the airworthiness requirements is solved to ensure the stability of the airport navigation lighting facilities and ensure the safe operation of aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A three-dimensional diagram of the isolation transformer box of the self-draining airport navigation lighting provided by the utility model.

[0015] Figure 2 The present invention is a perspective view of the isolation transformer box structure of the self-draining airport navigation light provided by the utility model.

[0016] Figure 3 The utility model is a schematic diagram of the structure decomposition of the isolation transformer box of the self-draining airport navigation light.

[0017] Figure 4 The utility model provides an exploded schematic diagram of the connection between the box cover and the box body in the isolation transformer box of the self-draining airport navigation light, and the connection structure of the bimetallic one-way drain valve and the one-way water-permeable protective membrane on the box cover.

[0018] Figure 5 The utility model provides a perspective view of the bimetallic one-way drain valve structure in the isolation transformer box of the self-draining airport navigation light.

[0019] Figure 6 The utility model provides a perspective view of the structure of an insect-proof and anti-fouling one-way drainage device in an isolation transformer box of a self-draining airport navigation light.

[0020] Figure 7 The utility model provides a schematic diagram of the structure of an insect-proof and anti-fouling one-way drainage device in an isolation transformer box of a self-draining airport navigation light. DETAILED DESCRIPTION

[0021] The utility model is described in detail below with reference to the accompanying drawings.

[0022] like Figure 1 — Figure 7As shown, the isolation transformer box of the airport navigation lamp with self-draining function provided by the utility model comprises a box cover 1, a box body 2, an O-ring 5, a one-way waterproof breathable membrane 6, a bimetallic one-way drain valve 7, a side metal cable waterproof joint 8, a bottom metal cable waterproof joint 9 and an insect-proof and anti-fouling one-way drain device 10; wherein the upper end of the box body 2 is open, buried at the junction of the shoulder and the soil area around the airport runway and fixed by pouring concrete around it, a side metal cable waterproof joint 8 is provided on the side wall, and the bottom surface is provided with a waterproof joint 8. Two bottom metal cable waterproof connectors 9 are provided on the side, and an insect-proof and anti-fouling one-way hydrophobic device 10 is provided in the middle of the bottom surface; the box cover 1 covers the upper opening of the box body 2, and is flush with the height of the road shoulder. An opening for installing a one-way waterproof and breathable membrane 6 is formed in the middle, and the edge is detachably fixed to the upper port of the box body 2 by bolts 3; a bimetallic one-way hydrophobic valve 7 is installed on the lower side of the one-way waterproof and breathable membrane 6; an O-ring 5 is arranged on the inner edge of the upper port of the box body 2 to ensure that the box cover 1 is tightly connected to the box body 2.

[0023] The box cover 1 and the box body 2 are both made of cast iron or aluminum alloy.

[0024] The one-way waterproof breathable membrane 6 is made of expanded polytetrafluoroethylene (EPTFE) film and polypropylene material.

[0025] The bimetallic one-way steam trap 7 comprises a temperature sensing element auxiliary plate 4, a bimetallic temperature sensing element 11, a spring 12, a valve core 13, a valve 14 and an adjusting rod 19; wherein, the water vapor inlet of the valve 14 is located at the lower end, the water vapor outlet is located at the upper end, and the adjusting rod 19 is vertically arranged in the middle of the inside; multiple groups of bimetallic temperature sensing elements 11 are nested in the lower part of the adjusting rod 19 and form a whole with the temperature sensing element auxiliary plate 4 around them; the lower outer side of the adjusting rod 19 is sleeved with a spring 12; the upper end of the spring 12 is fixed to the upper part of the adjusting rod 19, and the lower end is fixed to the upper end of the temperature sensing element auxiliary plate 4; the valve core 13 is fixed to the upper end of the adjusting rod 19.

[0026] The model of the side metal cable waterproof connector 8 is M20×1.5, and the model of the bottom metal cable waterproof connector 9 is M25×1.5.

[0027] The insect-proof and anti-fouling one-way hydrophobic device 10 includes a permeable stone 15, a floor drainage device 16, an anti-permeability water membrane 17 and a protective device 18, wherein the protective device 18 is a screw-type shell structure, the upper and lower ends of which are both open, and the upper end is fixed to the bottom surface of the box body 2; the floor drainage device 16 is installed on the inner upper part of the protective device 18; the anti-permeability water membrane 17 and the permeable stone 15 are sequentially covered on the top surface of the floor drainage device 16.

[0028] The water-impermeable membrane 17 is made of high-density polyethylene material.

[0029] The method for using the self-draining isolation transformer box of the airport navigation lighting provided by the utility model is described as follows:

[0030] In order to protect the isolation transformer, cable connector and other facilities of the airport navigation lights, the box 2 of the isolation transformer box is pre-buried in the lifting belt soil surface area around the runway, taxiway, etc., and then the isolation transformer is placed in the box 2, and the required navigation lights are connected to the isolation transformer in the box 2 through the side metal cable waterproof connector 8 and the bottom metal cable waterproof connector 9. The surrounding is further fixed and sealed with epoxy resin and other materials to ensure that the box 2 is sealed completely and reliably. Then, the O-ring 5 is set on the inner edge of the upper port of the box 2, and the box cover 1 is covered on the upper opening of the box 2, flush with the height of the shoulder, and the edge is fixed to the upper port of the box 2 with bolts 3.

[0031] When water accumulates at the bottom of the box 2 due to condensation caused by high temperature and the breathing effect, the accumulated water will be discharged from the box 2 and enter the soil through the permeable stone 15 and the ground drainage device 16 on the insect-proof and anti-fouling one-way hydrophobic device 10 set at the bottom of the box 2. The permeable stone 15 can also prevent underground organisms from entering. The ground drainage device 16 and the one-way permeable membrane 17 can jointly prevent groundwater from seeping into the box 2, and the protective device 18 is used to protect the ground drainage device 16.

[0032] When the isolation transformer in the isolation transformer box is not working, the temperature in the box body 2 is maintained at room temperature, the bimetallic temperature sensing element 11 is maintained in a flat state, and the water vapor outlet at the upper end of the valve 14 is blocked by the valve core 13 and is in a closed state. At this time, the isolation transformer box is in a closed state; when the heat generated during the operation of the isolation transformer causes the internal temperature of the box body 2 to rise, the bimetallic temperature sensing element 11 will bend and deform downward due to the different thermal expansion coefficients of the bimetallic strips on it, thereby driving the surrounding auxiliary plate 4 fixed thereto to move downward, further pulling the lower end of the spring 12 connected to the auxiliary plate 4, and then the spring 12 will generate a pulling force on the regulating rod 19 and the valve core 13 at its upper end, so that the valve core 13 leaves the water vapor outlet at the upper end of the valve 14 and opens the valve 14. At this time, the water vapor in the box body 2 will be discharged from the water vapor inlet at the lower end of the valve 14 through the inside of the valve 14 and from the water vapor outlet and the one-way waterproof breathable membrane 6 to the outside of the box body 2, thereby reducing the air humidity in the box body 2. When the temperature in the box 2 is restored, the bimetallic temperature sensing element 11 returns to a flat state, and the valve core 13 moves up to block the water vapor outlet at the upper end of the valve 14 again, so that the box 2 returns to a closed state. In addition, the one-way waterproof breathable membrane 6 can further prevent the inflow of rainwater from the outside. The bimetallic one-way steam trap 7 and the insect and anti-fouling one-way steam trap device 10 can be replaced and repaired in time, thereby saving costs and reducing the difficulty of maintenance.

Claims

1. A self-draining isolation transformer box for airport navigation lights, characterized in that: The isolation transformer box comprises a box cover (1), a box body (2), an O-ring (5), a one-way waterproof breathable membrane (6), a bimetallic one-way drain valve (7), a side metal cable waterproof joint (8), a bottom metal cable waterproof joint (9) and an insect and anti-fouling one-way drain device (10); wherein the upper end of the box body (2) is open, buried at the junction of the shoulder and the soil area around the airport runway and fixed by pouring concrete around it, a side metal cable waterproof joint (8) is provided on the side wall, and two bottom metal cable waterproof joints (8) are provided on the outer side of the bottom surface. A waterproof joint (9) is provided with an insect-proof and anti-fouling one-way drain device (10) in the middle of the bottom surface; the box cover (1) covers the upper end opening of the box body (2) and is flush with the height of the road shoulder. An opening for installing a one-way waterproof breathable membrane (6) is formed in the middle, and the edge is fixed to the upper end of the box body (2) in a detachable manner by bolts (3); a bimetallic one-way drain valve (7) is installed on the lower side of the one-way waterproof breathable membrane (6); an O-ring (5) is arranged on the inner edge of the upper end of the box body (2) to ensure that the box cover (1) and the box body (2) are tightly connected.

2. The self-draining isolation transformer box for airport navigation lights according to claim 1, characterized in that: The box cover (1) and the box body (2) are both made of cast iron or aluminum alloy.

3. The self-draining isolation transformer box for airport navigation lights according to claim 1, characterized in that: The bimetallic one-way steam trap (7) comprises a temperature sensing element auxiliary plate (4), a bimetallic temperature sensing element (11), a spring (12), a valve core (13), a valve (14) and an adjusting rod (19); wherein the water vapor inlet of the valve (14) is located at the lower end, the water vapor outlet is located at the upper end, and the adjusting rod (19) is vertically arranged in the middle of the valve (14); multiple groups of bimetallic temperature sensing elements (11) are nested in the lower part of the adjusting rod (19) and are formed as a whole by using the surrounding temperature sensing element auxiliary plate (4); the lower outer side of the adjusting rod (19) is covered with a spring (12); the upper end of the spring (12) is fixed to the upper part of the adjusting rod (19), and the lower end is fixed to the upper end of the temperature sensing element auxiliary plate (4); the valve core (13) is fixed to the upper end of the adjusting rod (19).

4. The self-draining isolation transformer box for airport navigation lights according to claim 1, characterized in that: The model of the side metal cable waterproof connector (8) is M20×1.5, and the model of the bottom metal cable waterproof connector (9) is M25×1.

5.

5. The self-draining isolation transformer box for airport navigation lighting according to claim 1, characterized in that: The insect-proof and anti-fouling one-way water-repellent device (10) comprises a permeable stone (15), a floor drainage device (16), an anti-permeability water membrane (17) and a protective device (18), wherein the protective device (18) is a screw-type shell structure, the upper and lower ends of which are both open, and the upper end is fixed to the bottom surface of the box body (2); the floor drainage device (16) is installed in the inner upper part of the protective device (18); and the anti-permeability water membrane (17) and the permeable stone (15) are sequentially covered on the top surface of the floor drainage device (16).

6. The self-draining isolation transformer box for airport navigation lights according to claim 5, characterized in that: The water-impermeable membrane (17) is made of high-density polyethylene material.

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