CN216695156U

CN216695156U - Thunder and lightning protection structure of oil level annunciator

Info

Publication number: CN216695156U
Application number: CN202122744699.0U
Authority: CN
Inventors: 李文琼; 余晓东; 何玲
Original assignee: Sichuan Fanhua Aviation Instrument and Electrical Co Ltd
Current assignee: Sichuan Fanhua Aviation Instrument and Electrical Co Ltd
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2022-06-07
Anticipated expiration: 2031-11-10

Abstract

The utility model discloses a lightning protection structure of an oil level annunciator, which comprises an installation outer barrel and a bushing in threaded connection with the installation outer barrel, wherein a first epoxy resin layer is arranged at the threaded connection part between the installation outer barrel and the bushing; a wiring disc is arranged at the center of the mounting outer barrel, a guide pipe coaxially penetrates through the wiring disc, a plurality of wiring rods are arranged on the wiring disc and positioned around the guide pipe along the circumferential direction, and a second epoxy resin layer is arranged between the wiring rods and the guide pipe; the oil level annunciator has the advantages of effectively preventing the gap between the internal parts of the oil level annunciator from generating discharge and ignition in a lightning high-voltage environment and effectively preventing oil from exploding.

Description

Thunder and lightning protection structure of oil level annunciator

Technical Field

The utility model belongs to the technical field of lightning protection of oil level annunciators, and particularly relates to a lightning protection structure of an oil level annunciator.

Background

The oil level annunciator is one of the common aircraft parts for measuring the oil level, and mainly comprises a guide pipe, a mounting disc, a magnetic floater, a wiring rod and other structures, and a spring washer, a clamping ring and other connecting and positioning structures. There are slight clearances between the various connecting structures, such as between the terminal stem and the conduit, and between adjacent spring washers. When the aircraft is in thunder and lightning weather, the inside small installation clearance of traditional oil level annunciator can be punctured easily to the superhigh pressure magnetic field that the thunder and lightning caused and electric field, and then causes the phenomenon of striking sparks that appears discharging between the small clearance, not only can influence the operation of oil level annunciator, still probably directly explode the fuel simultaneously in addition, causes great incident.

Therefore, the utility model discloses a lightning protection structure of an oil level annunciator, aiming at the defect that the traditional oil level annunciator is easy to generate discharge and ignition phenomena under the environment of ultrahigh voltage of lightning to cause fuel oil deflagration.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a lightning protection structure of an oil level annunciator, which effectively avoids the phenomenon of discharge and ignition in the internal structure of the oil level annunciator under the condition of ultrahigh lightning pressure, and further effectively avoids fuel oil deflagration.

The utility model is realized by the following technical scheme:

the lightning protection structure of the oil level annunciator comprises an installation outer barrel and a bushing in threaded connection with the installation outer barrel, wherein a first epoxy resin layer is arranged at the threaded connection part between the installation outer barrel and the bushing; the installation urceolus center department is provided with the wiring dish, coaxial the running through is provided with the pipe on the wiring dish, be located on the wiring dish and be provided with a plurality of wiring poles along circumference around the pipe, set up second epoxy layer between wiring pole and the pipe.

The one end of installation urceolus is the mounting disc, and the other end of installation urceolus is the through-hole that supplies the bush installation, is provided with the through-hole or logical groove that supply the wiring dish installation on the mounting disc. At first with the pipe installation on the wiring dish, then lie in on the wiring dish around the pipe along a plurality of wiring poles of circumference installation constitution wiring dish subassembly, then fill epoxy between wiring pole and pipe and constitute first epoxy layer, keep apart wiring pole and pipe through first epoxy layer, avoid causing under thunder and lightning superhigh pressure environment and produce the phenomenon of striking sparks that discharges between wiring pole and the pipe, avoid fuel detonation.

After the wiring board assembly is installed, the bushing is installed inside the installation outer barrel, and the bushing is connected with the installation outer barrel in a threaded screwing mode. Simultaneously, the threaded connection department filling epoxy of bush and installation urceolus constitutes the second epoxy layer, keeps apart bush and installation urceolus through the second epoxy layer, and then avoids causing the clearance discharge between bush and the installation urceolus to strike sparks under thunder and lightning superhigh pressure environment and cause fuel oil detonation.

In the case of a lightning high-voltage environment, the space between the terminal rod and the bushing and the space between the guide pipe and the bushing cannot be broken through, so that the terminal rod and the bushing and the guide pipe and the bushing do not need to be isolated from each other.

In order to better implement the utility model, a conduit mounting hole is further formed in the center of the wire connecting disc, a conduit is mounted in the conduit mounting hole, and a third epoxy resin layer is arranged between the inner wall of the conduit mounting hole and the outer wall of the conduit.

In order to better realize the utility model, a plurality of wiring stepped holes are uniformly arranged on the wiring plate around the conduit mounting hole along the circumferential direction, wiring rods are arranged in the wiring stepped holes, and a fifth epoxy resin layer is arranged between the inner walls of the wiring stepped holes and the outer walls of the wiring rods.

In order to better realize the utility model, a mounting stepped hole is further arranged at the center of the mounting outer cylinder, a stepped boss correspondingly matched and connected with the mounting stepped hole is arranged at one end of the wiring plate, and a fourth epoxy resin layer is arranged between the inner wall of the mounting stepped hole and the outer wall of the stepped boss.

In order to better realize the utility model, further, an inner wall of one end of the mounting outer cylinder is provided with an internal thread and a first resin injection groove, an outer wall of one end of the bushing is provided with an external thread corresponding to the internal thread, and an outer wall of one end of the bushing is provided with a second resin injection groove corresponding to the first resin injection groove.

In order to better implement the utility model, further, the axial length of the internal thread is greater than or equal to the axial length of the external thread.

In order to better realize the utility model, further, the internal thread is made of a duralumin material, and the external thread is made of a reinforced nylon material.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

(1) according to the utility model, the mounting outer cylinder is directly in threaded connection with the bushing, so that a structure that the outer cylinder and the bushing are connected through the spring washer and the retainer ring in the traditional oil level annunciator is replaced, the gap between parts is reduced, meanwhile, the first epoxy resin layer is arranged at the thread position of the mounting outer cylinder and the bushing to isolate the mounting outer cylinder from the bushing, and meanwhile, the thread gap is filled with the epoxy resin, so that the gap between the mounting outer cylinder and the bushing is prevented from being discharged and ignited under the condition of lightning high voltage, and fuel oil deflagration is effectively avoided at the same time on the premise of simplifying the mounting structure;

(2) according to the utility model, the third epoxy resin layer is arranged at the joint between the wiring disc and the guide pipe, the fifth epoxy resin layer is arranged at the joint between the wiring disc and the wiring rod, and the second epoxy resin layer is arranged between the wiring rod and the guide rod, so that the insulation between the wiring disc, the guide pipe and the wiring rod is effectively realized, the gap between the wiring disc, the guide pipe and the wiring rod is prevented from discharging and igniting under the condition of high lightning voltage, and the fuel oil deflagration is effectively avoided;

(3) according to the utility model, the fourth epoxy resin layer is arranged at the joint between the mounting disc and the wiring disc, so that the mounting disc and the wiring disc are isolated, and meanwhile, the gap between the wiring disc and the mounting disc is prevented from discharging and igniting under the condition of high lightning voltage, so that fuel oil deflagration is effectively avoided.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the connection structure of the conduit and the terminal block;

FIG. 3 is a schematic view of a connecting structure for mounting the outer cylinder and the bush;

fig. 4 is a partially enlarged view of a portion a of fig. 3.

Wherein: 1, installing an outer cylinder; 2-a bushing; 3-a patch panel; 4-a catheter; 5-a wiring rod; 01-a first epoxy layer; 02-a second epoxy layer; 03-a third epoxy layer; 04-fourth epoxy resin layer; 05-a fifth epoxy resin layer; 111-a first resin injection tank; 222-second resin injection tank.

Detailed Description

Example 1:

the lightning protection structure of the oil level annunciator of the present embodiment, as shown in fig. … …, includes an installation outer cylinder 1 and a bushing 2 screwed with the installation outer cylinder 1, wherein a first epoxy resin layer 01 is arranged at the screwed joint between the installation outer cylinder 1 and the bushing 2; the installation urceolus 1's center department is provided with wiring dish 3, coaxial running through is provided with pipe 4 on the wiring dish 3, be located on the wiring dish 3 around pipe 4 and be provided with a plurality of wiring poles 5 along circumference, set up second epoxy layer 02 between wiring pole 5 and the pipe 4.

The bush 2 is directly connected with the mounting outer cylinder 1 through a threaded connection mode to form a shell structure, the traditional mode that the mounting cylinder is connected with an outer bush through a spring washer and a clamping ring is replaced, and the spring washer and the clamping ring are cancelled, so that the phenomenon of discharging and sparking caused by the generation of ultrahigh pressure in small gaps between the mounting cylinder and the spring washer, between the mounting through pipe and the clamping ring and between the spring washer and the clamping ring under the condition of ultrahigh voltage of thunder and lightning is avoided. Simultaneously, adopt threaded connection's mode directly to be connected installation urceolus 1 and bush 2, threaded connection department between installation urceolus 1 and bush 2 sets up first epoxy layer 01 simultaneously, keeps apart through first epoxy layer 01 the small clearance of installing between urceolus 1 and the bush 2 and insulates, and then effectively avoids producing the superhigh pressure under the thunder and lightning high pressure condition, and then avoids producing the condition that discharges to strike sparks and detonate the fuel.

The one end of installation urceolus 1 is provided with the mounting disc that supplies 3 installations of wiring dish, be provided with the opening that supplies bush 2 to pack into on the other end of installation urceolus 1, wiring dish 3 is directly installed at the center of mounting disc, the coaxial run-through of center department of wiring dish 3 installs pipe 4, and lie in pipe 4 on the wiring dish 3 and evenly install a plurality of connecting rod 5 along circumference around, the filling has second epoxy layer 02 between connecting rod 5 and the pipe 4, through second epoxy layer 02 with the outside of connecting rod 5 and the outside complete cladding of pipe 4 and keep apart pipe 4 and connecting rod 5, produce the superhigh pressure and lead to the phenomenon of discharging and striking sparks between pipe 4 and connecting rod 5 under the thunder and lightning superhigh pressure condition, and then effectively avoid fuel detonation.

Example 2:

this embodiment is further optimized based on embodiment 1, as shown in fig. … …, a conduit mounting hole is formed in the center of the land 3, a conduit 4 is mounted in the conduit mounting hole, and a third epoxy resin layer 03 is disposed between the inner wall of the conduit mounting hole and the outer wall of the conduit 4. Through set up third epoxy layer 03 between pipe 4 and pipe mounting hole, and then effectively keep apart pipe 4 and wiring dish 3, effectively avoid simultaneously under the thunder and lightning superhigh pressure condition producing between pipe 4 and wiring dish 3 the phenomenon of striking sparks that discharges.

Further, a filling ring groove for filling epoxy resin is provided on the inside of the pipe installation hole, and the third epoxy resin layer 03 is formed by directly filling epoxy resin in the filling ring groove.

Further, evenly be provided with a plurality of wiring shoulder holes along circumference on the wiring dish 3 around lieing in the pipe mounting hole, be provided with the junction pole 5 in the wiring shoulder hole, be provided with fifth epoxy layer 05 between the inner wall of wiring shoulder hole and the outer wall of junction pole 5.

The tip that the one end of binding post 5 passed the wiring shoulder hole extends to around pipe 4, the other end of binding post 5 passes the main aspects setting of wiring shoulder hole, be provided with fifth epoxy layer 05 between the inner wall of the tip of wiring shoulder hole and the outer wall of binding post 5 and between the inner wall of the main aspects of wiring shoulder hole and the outer wall of binding post 5, and then realize the isolation between binding post 5 and the wiring dish 3, avoid producing the phenomenon of striking sparks that discharges under the thunder and lightning superhigh pressure condition between binding post 5 and wiring dish 3.

Other parts of this embodiment are the same as embodiment 1, and thus are not described again.

Example 3:

this embodiment is further optimized on the basis of above-mentioned

embodiment

1 or 2, the center department of installation urceolus 1 is provided with the installation shoulder hole, the one end of wiring dish 3 is provided with the ladder boss that corresponds the cooperation with the installation shoulder hole and be connected, be provided with fourth epoxy layer 04 between the outer wall of the inner wall of installation shoulder hole and ladder boss.

Through the cooperation between ladder boss and the installation shoulder hole terminal surface, realize that terminal plate 3 is installed along axial location at installation urceolus 1, be provided with fourth epoxy layer 04 simultaneously between the outer wall of the inner wall of installation shoulder hole and ladder boss, realize the isolation between terminal plate 3 and the installation urceolus 1, avoid producing the phenomenon of striking sparks of discharging under the thunder and lightning superhigh pressure condition between terminal plate 3 and installation urceolus 1.

Furthermore, a filling ring groove for filling epoxy resin is arranged on the inner wall of the mounting stepped hole, and the fourth epoxy resin layer 04 is formed by directly filling epoxy resin in the filling ring groove.

The rest of this embodiment is the same as

embodiment

1 or 2, and therefore, the description thereof is omitted.

Example 4:

this embodiment is further optimized on the basis of any of the above embodiments 1 to 3, wherein an inner wall of one end of the mounting outer cylinder 1 is provided with an internal thread and a first resin injection groove 111, an outer wall of one end of the bushing 2 is provided with an external thread corresponding to the internal thread, and an outer wall of one end of the bushing 2 is provided with a second resin injection groove 222 corresponding to the first resin injection groove 111.

The first and second

resin injection grooves

111 and 222 are aligned to constitute a first epoxy resin layer 01 by directly injecting epoxy resin into the first and second

resin injection grooves

111 and 222, respectively, to constitute a first injection groove for focusing on the epoxy resin.

Further, the axial length of the internal thread is greater than or equal to the axial length of the external thread.

Furthermore, the internal thread is made of a duralumin material, and the external thread is made of a reinforced nylon material.

The other parts of this embodiment are the same as those of embodiments 1 to 3, and thus are not described again.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.

Claims

1. The lightning protection structure of the oil level annunciator is characterized by comprising an installation outer cylinder (1) and a bushing (2) in threaded connection with the installation outer cylinder (1), wherein a first epoxy resin layer (01) is arranged at the threaded connection position between the installation outer cylinder (1) and the bushing (2); the installation urceolus (1) the center department is provided with wiring dish (3), coaxial running through is provided with pipe (4) on wiring dish (3), be provided with a plurality of wiring poles (5) along circumference on wiring dish (3) lieing in around pipe (4), set up second epoxy layer (02) between wiring pole (5) and pipe (4).

2. The lightning protection structure of an oil level annunciator according to claim 1, wherein a conduit mounting hole is formed at the center of the terminal plate (3), a conduit (4) is mounted in the conduit mounting hole, and a third epoxy resin layer (03) is arranged between the inner wall of the conduit mounting hole and the outer wall of the conduit (4).

3. The lightning protection structure of a fuel level annunciator as claimed in claim 1, wherein a plurality of wiring stepped holes are uniformly arranged on the wiring plate (3) along the circumference of the conduit mounting hole, a wiring rod (5) is arranged in each wiring stepped hole, and a fifth epoxy resin layer (05) is arranged between the inner wall of each wiring stepped hole and the outer wall of the wiring rod (5).

4. The lightning protection structure of an oil level annunciator according to claim 1, characterized in that a mounting stepped hole is formed in the center of the mounting outer cylinder (1), a stepped boss correspondingly matched and connected with the mounting stepped hole is formed at one end of the wire connecting disc (3), and a fourth epoxy resin layer (04) is arranged between the inner wall of the mounting stepped hole and the outer wall of the stepped boss.

5. The lightning protection structure of a fuel level annunciator according to claim 4, wherein an inner wall of one end of the mounting outer cylinder (1) is provided with an internal thread and a first resin injection groove (111), an outer wall of one end of the bushing (2) is provided with an external thread corresponding to the internal thread, and an outer wall of one end of the bushing (2) is provided with a second resin injection groove (222) corresponding to the first resin injection groove (111).

6. The lightning protection structure of an oil level annunciator of claim 5, wherein the axial length of the internal thread is equal to or greater than the axial length of the external thread.

7. The oil level annunciator lightning protection structure of claim 6, wherein the internal threads are made of a duralumin material and the external threads are made of a reinforced nylon material.