Equipotential electrostatic pile assembly of aircraft refueling vehicle

Abstract

The utility model belongs to the technical field of static conductive equipment of a refueling truck, and discloses an equipotential static pile assembly of an aircraft refueling truck, which is used for connecting an aircraft and the refueling truck to realize an equipotential effect when the aircraft is refueled, and comprises a take-up cylinder and a placement frame which are arranged on the refueling truck, the pull-out end of the static wire is connected with a second static clamp which is clamped on the placing frame. The device further comprises a first electrostatic clamp, one end of the first electrostatic clamp is connected with the placement frame through a cable, and the take-up barrel is provided with a conductive end which is clamped by the first electrostatic clamp and forms an electrostatic conduction line from the second electrostatic clamp, the electrostatic wire, the take-up barrel, the first electrostatic clamp and the cable to the placement frame.

Description

Technical Field

[0001] The utility model belongs to the technical field of aircraft refueling vehicles, and in particular relates to an equipotential electrostatic pile component for an aircraft refueling vehicle. Background Art

[0002] Aviation fuel is a hazardous chemical, and the accumulation of static electricity can pose a significant safety hazard. There are two main reasons why static electricity can accumulate during the use of aviation fuel: First, when the fuel truck is refueling (pumping) an aircraft, the high-speed flow of the fuel in the pressurized pipeline generates a large amount of static electricity; second, when the fuel in the aircraft tank is sloshed, or when the aircraft engine pumps rapidly, drawing in the flowing fuel, both of which generate a large amount of static electricity.

[0003] When a refueling truck is refueling (pumping fuel) an aircraft, it needs to connect the refueling equipment to the aircraft's fuel tank. If the accumulated static electricity is not effectively eliminated or the potential balance between the refueling truck and the aircraft is not maintained, a potential difference will form between the two, causing static ion discharge, which can lead to unsafe events such as fire and explosion. Therefore, before the operation, the static conductive wire of the static conductive device on the refueling truck must be connected to the static grounding pile on the aircraft to ensure potential balance between the refueling truck and the aircraft, prevent discharge caused by the potential difference, and ensure the safety of the operation, equipment, and personnel.

[0004] The static dissipation device currently installed on aircraft refueling trucks consists of a take-up spool bracket, a main shaft, a take-up spool assembly, an electrostatic conductor, and a grounding clamp. The take-up spool assembly is mounted on the main shaft via a bearing, a bushing, and a spring. When static dissipation or potential balance is required, the electrostatic conductor is pulled out of the take-up spool assembly and connected to the ground with a conductive clamp or to the aircraft's static grounding post. This creates a complete static dissipation path along the route from refueling truck to take-up spool bracket, main shaft, take-up spool assembly, electrostatic conductor, grounding clamp, and aircraft.

[0005] Existing static-dissipation devices have technical flaws: According to Section 6.44 of the "Civil Aviation Fuel Equipment Integrity Technical Specification (MHT6002-2008), the resistance of the static-dissipation cable through the static-dissipation cable clamp should be no greater than 10Ω. This resistance is typically determined by finding the rotational position between the take-up spool assembly and the main shaft during testing, and is commonly referred to as the static resistance value. However, in actual operation, wear, corrosion, oscillation, looseness, and other factors between the take-up spool assembly and the main shaft may not always achieve this ideal rotational position, thus affecting static-dissipation conduction. In some cases, the static-dissipation channel resistance may exceed 10Ω, rendering the test invalid or significantly exceeding the resistance limit. To prevent these situations, static-dissipation devices typically require regular dynamic resistance testing. Even so, frequent and prolonged static-dissipation cable extraction and retraction operations in actual operation can make it difficult to ensure the conductive integrity of the static-dissipation channel, resulting in either invalid resistance tests or significantly exceeding the resistance limit. Utility Model Content

[0006] In order to solve the problems existing in the prior art, the utility model provides an equipotential electrostatic pile assembly for aircraft refueling trucks. By modifying the original rotating electrical connection part into a manual connection structure, its stability is improved, avoiding safety hazards caused by increased resistance due to long-term use.

[0007] The technical solution adopted by this utility model is:

[0008] In a first aspect, the utility model provides an equipotential electrostatic pile assembly for an aircraft refueling truck, which is used to connect an aircraft and a refueling truck to achieve an equipotential effect during refueling. The assembly includes a wire reel and a placement rack provided on the refueling truck. The wire reel is wound around an electrostatic wire, and the pulled-out end of the electrostatic wire is connected to a second electrostatic clamp, which is placed on the placement rack.

[0009] It also includes a first electrostatic clamp, one end of which is conductively connected to the refueling truck through a cable, and the take-up drum is provided with a conductive end portion for the first electrostatic clamp to clamp and form an electrostatic conductive path from the second electrostatic clamp, the electrostatic conductor, the take-up drum, the first electrostatic clamp, the cable to the refueling truck.

[0010] In combination with the first aspect, the utility model provides a first embodiment of the first aspect, wherein the wire reel is fixed on the refueling truck through a bracket, and one end of the electrostatic wire is fixed at the central axis of the wire reel and passes through the wire reel to be connected to the conductive end portion arranged on one side of the wire reel.

[0011] In combination with the first aspect, the present invention provides a second embodiment of the first aspect, wherein the take-up drum includes a rotating drum at a central axis and circular baffles provided at both ends of the rotating drum, and the electrostatic wire is wound around the rotating drum;

[0012] A through hole is provided on one side of the circular baffle near the center of the circle, and one end of the electrostatic wire passes through the through hole. The conductive end is a conductive plate attached to the outer surface of the circular baffle. The end of the electrostatic wire passing through the through hole is conductively connected to the conductive plate, and the conductive plate occupies no less than 90% of the area of the circular baffle.

[0013] In combination with the first aspect, the present invention provides a third embodiment of the first aspect, wherein the take-up drum includes a rotating drum at a central axis and circular baffles provided at both ends of the rotating drum, and the electrostatic wire is wound around the rotating drum;

[0014] A through hole is provided on one side of the circular baffle near the center of the circle, and one end of the electrostatic wire passes through the through hole. The conductive end is a conductive strip fitted on the circular baffle, and the conductive strip extends outward from the through hole and exceeds the edge of the circular baffle to form a conductive block.

[0015] In combination with the first aspect, the utility model provides a fourth embodiment of the first aspect, wherein the placement rack is a return interlocking rack near the take-up drum, the return interlocking rack is a smooth columnar body, and the unused first electrostatic clamp and the unused second electrostatic clamp are clamped and placed on the return interlocking rack.

[0016] In combination with the first aspect, the present invention provides a fifth embodiment of the first aspect, wherein the placement rack is a return interlock rack near the take-up reel, the return interlock rack comprising a pile body fixed to the refueling truck, and a first clamping plate and a second clamping plate provided on the pile body with a spacing therebetween, the second clamping plate being a U-shaped structure, and the second electrostatic clamp being clamped on the second clamping plate;

[0017] The first electrostatic clamp is clamped on the first clamping plate, and one end of the cable is fixed to the second clamping plate by a bolt.

[0018] In combination with the first aspect, the utility model provides a sixth embodiment of the first aspect, wherein the conductive end is an L-shaped conductive pile arranged on one side of the circular baffle, and the conductive pile has a parallel portion parallel to the circular baffle, and a bent portion perpendicular to the plane of the circular baffle, and the first electrostatic clamp is clamped on the bent portion when connected.

[0019] The beneficial effects of the utility model are:

[0020] The utility model separately provides an electrostatic clamp and a placement frame structure on the refueling truck, which can facilitate the connection of the electrostatic wire on the take-up drum to the vehicle after it is pulled out and fixed to form an electrostatic conductive line, thereby replacing the existing rotating conductive connection structure, reducing the risk of wear and tear, and ensuring that its resistance value is always within the qualified range. At the same time, by optimizing the connection relationship between the electrostatic clamp and the take-up drum, while ensuring that the take-up drum can stably rotate to pull out or retract the electrostatic wire, it can also always have an end that is convenient for the electrostatic clamp to clamp. The entire component structure is simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an axonometric diagram of the equipotential electrostatic pile assembly of the first solution in the embodiment of the present utility model;

[0022] Figure 2 This is a front view of the equipotential electrostatic pile assembly of the first solution in the embodiment of the present utility model;

[0023] Figure 3 This is an axonometric view of the equipotential electrostatic pile assembly on a platform according to the first embodiment of the present utility model;

[0024] Figure 4 This is a front view of the equipotential electrostatic pile assembly of the first solution in the embodiment of the present utility model on the platform;

[0025] Figure 5 1 is a side view of an equipotential electrostatic pile assembly according to a second embodiment of the present invention;

[0026] Figure 6 1 is a front view of an equipotential electrostatic pile assembly according to a second embodiment of the present utility model;

[0027] Figure 7 This is an axonometric diagram of the equipotential electrostatic pile assembly of the third solution in the embodiment of the present utility model;

[0028] Figure 8 This is a side view of the first electrostatic clamp after clamping in the third solution of the embodiment of the utility model;

[0029] Figure 9 This is a side view of an embodiment of the utility model in which the electrostatic clamp is placed on a return interlock frame;

[0030] Figure 10 This is a front view of an embodiment of the utility model in which the electrostatic clamp is placed on a return interlocking frame;

[0031] Figure 11 It is an axonometric view of an embodiment of the utility model in which the electrostatic clamp is placed on a return interlocking frame.

[0032] In the figure: 1-take-up drum, 2-bracket, 3-return interlocking frame, 4-first electrostatic clamp, 5-cable, 6-conductive block, 7-second electrostatic clamp, 8-conductive pile, 9-conductive plate, 10-circular baffle, 11-rotating drum, 12-wire harness guide frame. DETAILED DESCRIPTION

[0033] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without making any creative efforts shall fall within the scope of protection of the present application.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0037] In the description of this application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on this application. In addition, if the terms "first", "second", etc. appear in the description of this application, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0038] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not necessarily imply that a component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical" and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0039] It should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. A person of ordinary skill in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0040] Example 1:

[0041] In this embodiment, an equipotential electrostatic pile assembly for an aircraft refueling truck is provided, which is arranged in an empty area of the flatbed of the refueling truck and mainly includes a rotatable take-up drum 1. A certain length of electrostatic conductive wire is wound around the take-up drum 1. The outer surface of the electrostatic conductive wire has a rubber insulating layer, one end of which is fixed to the inner side of the take-up drum 1, and the other end is connected to a second electrostatic clamp 7. The take-up drum 1 maintains an electrical connection with the refueling truck. When in use, the take-up drum 1 is rotated to pull out the electrostatic wire, and the second electrostatic clamp 7 is clamped to the corresponding connection position of the aircraft, thereby achieving an electrical conduction state between the refueling truck and the ground, and between the refueling truck and the aircraft before refueling.

[0042] Reference Figure 3 The take-up reel 1 comprises a central rotating drum 11 and circular baffles 10 disposed on either side of the drum 11. The drum 11 is a hollow tubular structure. Conventional take-up reels 1 have a rotating electrical connection structure, such as a brush or conductive ring, installed inside the drum 11. In this embodiment, one end of the static-conducting wire is fixed near the junction of the circular baffle 10 and the drum 11. A through-hole is provided in the circular baffle 10 at the junction. Once the static-conducting wire is fixed, the metal conductive material inside passes through the through-hole and connects to the conductive end on the outside.

[0043] The outside of the wire reel 1 is fixed on the plane of the tanker truck frame through a symmetrically arranged bracket 2, and a wire harness guide frame 12 is provided on the bracket 2, that is, it has a strip-shaped through-hole structure to facilitate the electrostatic wire to pass through and achieve the guiding effect.

[0044] Reference Figure 1-Figure 4 As a first solution, the conductive end in this embodiment is an L-shaped conductive post 8 positioned on one side of a circular baffle 10. The post 8 has a parallel portion aligned with the circular baffle 10 and a bent portion perpendicular to the plane of the baffle 10. The first electrostatic clamp 4 is clamped on the bent portion during connection. The cable 5 of the first electrostatic clamp 4 is connected to the bottom of the bracket 2 supporting the take-up reel 1, achieving electrical continuity through contact with the refueling truck frame.

[0045] In the first solution, a return interlocking frame 3 structure serving as a placement frame is also shown. The return interlocking frame 3 is a vertical smooth columnar structure, which facilitates direct clamping of the first electrostatic clamp 4 and the second electrostatic clamp 7 on its surface, thereby achieving the effect of return placement.

[0046] Reference Figure 5 、 Figure 6 、 Figures 9-11 As a second solution, this embodiment provides a component, including a wire reel 1 and a placement rack arranged on a refueling truck platform, wherein a certain length of soft electrostatic wire is wound around the wire reel 1.

[0047] The placement rack is a return interlock frame 3 with several clamping spaces. The main body of the return interlock frame 3 is a vertical structure formed by bending metal sheets. A second electrostatic clamp 7, located at the end of the electrostatic wire, is clamped and placed in one of the clamping spaces of the return interlock frame 3 when not in use. A first electrostatic clamp 4 is located in the other clamping space. The tail of the first electrostatic clamp 4 is connected to a cable 5 of a certain length, which is not less than the distance between the placement rack guide discs.

[0048] Specifically, the return interlock frame 3 includes a pile body fixed on the refueling truck, and a first clamping plate and a second clamping plate arranged on the pile body with a spacing therebetween. The second clamping plate is a U-shaped structure, and the second electrostatic clamp 7 is clamped on the second clamping plate; the first electrostatic clamp 4 is clamped on the first clamping plate, and one end of the cable 5 is fixed to the second clamping plate by a bolt.

[0049] The return interlock frame 3 maintains a conductive connection with the refueling truck, and the cable 5 is the same as the static-conducting wire, both of which adopt a soft metal wire structure covered with an insulating layer.

[0050] The take-up reel 1 has a conductive end portion that protrudes from the take-up reel 1. When in use, the second electrostatic clamp 7 is first pulled out and clamped at the corresponding position of the aircraft. After the position of the take-up reel 1 is fixed, the first electrostatic clamp 4 is removed and clamped on the conductive end portion, thereby realizing the conductive connection relationship of aircraft - second electrostatic clamp 7 - take-up reel 1 - first electrostatic clamp 4 - placement rack - refueling truck - grounding. By cooperating with the existing electrical conductivity testing mechanism, it is possible to automatically test whether the above structure is well grounded or forms a stable equipotential connection relationship after being connected.

[0051] It should be noted that the return interlock frame 3 is a safety device with other interlocking functions. It is primarily used to place the second electrostatic clamp 7 in a designated position after it has been retracted from the aircraft's static discharge pile. This device uses electromagnetic induction to automatically release the brakes upon sensing the return of the second electrostatic clamp 7. Otherwise, the vehicle remains in a constant braking state, preventing accidental damage to the static discharge cable 5 and related aircraft equipment, thereby achieving interlocking protection.

[0052] Further, as a second solution, refer to Figure 5 and Figure 6 A conductive strip extending from the through hole of the circular baffle 10 to the edge of the circular baffle 10 is provided on the surface of the circular baffle 10. The conductive strip forms an enlarged end after extending from the edge of the circular baffle 10, that is, referring to Figure 6 The conductive block 6 structure shown in the figure is an arc strip structure that fits the circular baffle 10 and has a hollow waist-shaped hole with a certain curvature, which is convenient for being clamped by the first electrostatic clamp 4.

[0053] Figure 5and Figure 6 What is shown in the figure is that the first electrostatic clamp 4 is removed from the placement rack and clamped on the conductive block 6. Since the take-up reel 1 itself has a limiting structure, that is, when the electrostatic wire is pulled out to a certain length and the second electrostatic clamp 7 is fixed, in order to maintain stability, the take-up reel 1 can be locked to prevent it from rotating by a pin or other locking structure provided on one side of the take-up reel 1. At this time, it is sufficient to keep the conductive block 6 in a position that is convenient for clamping. Figure 4 and Figure 7 The cable 5 is not shown, that is, when the first electrostatic clamp 4 is clamped on the conductive block 6, it is connected to the placement rack through the cable 5. At this time, an electrostatic path is formed from the aircraft to the refueling truck. At the same time, it is different from the structure of the sliding conductive connection in the prior art, which reduces wear and reduces the possibility of increased resistance.

[0054] Further, as a third solution, refer to Figure 7 and Figure 8 On either side of the circular baffle 10, a conductive plate 9 is provided, which is attached to the outer surface of the circular baffle 10. The conductive plate 9 is a layer of metal material directly attached to the outer surface of the circular baffle 10, and the metal core at one end of the electrostatic wire passes through the through hole and is directly welded to the conductive plate 9 to form a conductive connection. The radius of the conductive layer shown in the figure is slightly smaller than the radius of the circular baffle 10, but it fits the edge of the circular baffle 10 as much as possible without protruding from the edge of the circular baffle. This arrangement allows the first electrostatic clamp 4 to be directly clamped and fixed to the circular baffle 10 to achieve a conductive connection when the wire take-up reel 1 is rotated to any angle.

[0055] The present invention is not limited to the above optional embodiments. Anyone can derive various other forms of products based on the inspiration of the present invention. The above specific embodiments should not be construed as limiting the scope of protection of the present invention. The scope of protection of the present invention shall be based on the scope defined in the claims, and the specification can be used to interpret the claims.

Claims

1. Aircraft refueling truck equipotential electrostatic pile assembly, used to connect the aircraft and the refueling truck to achieve the equipotential effect during refueling, characterized by: The invention comprises a wire take-up drum (1) and a placement rack arranged on a refueling vehicle, wherein an electrostatic wire is wound on the wire take-up drum (1), a second electrostatic clamp (7) is connected to the drawn-out end of the electrostatic wire, and the second electrostatic clamp (7) is placed on the placement rack; The invention also includes a first electrostatic clamp (4), one end of which is conductively connected to the refueling vehicle through a cable (5), and the take-up drum (1) is provided with a conductive end portion of an electrostatic conductive line for clamping by the first electrostatic clamp (4) and forming a second electrostatic clamp (7), an electrostatic conductor, the take-up drum (1), the first electrostatic clamp (4), and the cable (5) to the refueling vehicle.

2. The aircraft refueling truck equipotential electrostatic pile assembly according to claim 1, characterized in that: The wire reel (1) is fixed to the refueling vehicle via a bracket (2); one end of the electrostatic wire is fixed to the central axis of the wire reel (1) and passes through the wire reel (1) to be connected to a conductive end portion provided on one side of the wire reel (1).

3. The aircraft refueling truck equipotential electrostatic pile assembly according to claim 1, characterized in that: The wire take-up drum (1) comprises a rotating drum (11) at a central axis and circular baffles (10) arranged at both ends of the rotating drum (11), and the electrostatic wire is wound around the rotating drum (11); A through hole is provided near the center of the circular baffle (10) on one side, and one end of the electrostatic wire passes through the through hole. The conductive end is a conductive plate (10) attached to the outer surface of the circular baffle (10). The end of the electrostatic wire passing through the through hole is conductively connected to the conductive plate (10), and the conductive plate (10) occupies no less than 90% of the area of the circular baffle (10).

4. The aircraft refueling truck equipotential electrostatic pile assembly according to claim 1, characterized in that: The wire take-up drum (1) comprises a rotating drum (11) at a central axis and circular baffles (10) arranged at both ends of the rotating drum (11), and the electrostatic wire is wound around the rotating drum (11); A through hole is provided on one side of the circular baffle (10) near the center of the circle, one end of the electrostatic wire passes through the through hole, and the conductive end is a conductive strip fitted on the circular baffle (10), and the conductive strip extends outward from the through hole and exceeds the edge of the circular baffle (10) to form a conductive block (6).

5. The aircraft refueling truck equipotential electrostatic pile assembly according to claim 1, characterized in that: The placement rack is a return interlocking rack (3) located near the take-up drum (1). The return interlocking rack (3) is a smooth columnar body. The unused first electrostatic clamp (4) and the second electrostatic clamp (7) are clamped and placed on the return interlocking rack (3).

6. The aircraft refueling truck equipotential electrostatic pile assembly according to claim 1, characterized in that: The placement frame is a return interlock frame (3) located near the take-up drum (1), and the return interlock frame (3) comprises a pile body fixed on the refueling vehicle, and a first clamping plate and a second clamping plate arranged on the pile body with a spacing therebetween, the second clamping plate being a U-shaped structure, and the second electrostatic clamp (7) being clamped on the second clamping plate; The first electrostatic clamp (4) is clamped on the first clamping plate, and one end of the cable (5) is fixed to the second clamping plate by a bolt.

7. The aircraft refueling truck equipotential electrostatic pile assembly according to claim 3, characterized in that: The conductive end portion is an L-shaped conductive pile (8) arranged on one side of the circular baffle (10), and the conductive pile (8) has a parallel portion parallel to the circular baffle (10) and a bent portion perpendicular to the plane of the circular baffle (10), and the first electrostatic clamp (4) is clamped on the bent portion during connection.

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