An electric control explosion-proof device for reel drive of a refueling vehicle

Abstract

The application discloses an electric control explosion-proof device of a refueling vehicle reel drive and belongs to the technical field of aircraft refueling equipment, which comprises a base, a cover plate, an installation groove formed in the base, a sealing element arranged at the groove opening of the installation groove, the cover plate being detachably installed on the base, a plurality of grooves being formed at the groove opening of the installation groove, a plurality of protrusions being formed on the cover plate, the plurality of protrusions being inserted and matched with the grooves to form an auxiliary sealing structure, and a drainage hole being formed in the sidewall of the groove. The auxiliary sealing structure and the sealing element can form double sealing protection, the use stability and safety and reliability of the whole electric control explosion-proof device in a rich oil operation scene are improved, condensed water can be discharged to the outside of the device in time through the drainage hole, and the condensed water is effectively prevented from accumulating around the installation groove and causing the sealing element to accelerate aging and the sealing effect to decrease.

Description

Technical Field

[0001] This utility model relates to the field of aircraft refueling equipment technology, and in particular to an electrically controlled explosion-proof device driven by a refueling truck reel. Background Technology

[0002] During refueling truck operations, the reel, as the core component for extending and retracting the fuel delivery pipeline, directly impacts the efficiency and safety of the refueling operation through precise control of its driving action. Currently, the extension of the pipeline during fuel delivery and its retraction after completion typically rely on electronic control components, such as controllers, relays, and terminals, to control the start / stop and speed adjustment of the drive mechanism. However, refueling environments are typically rich in oil, and the oil vapors formed by fuel evaporation can easily accumulate in the work area. During operation, the internal circuitry and component movements of the electronic control components can generate electrical sparks. If the accumulated oil vapors come into direct contact with these sparks, it can easily lead to combustion, explosion, or other serious safety accidents. Therefore, to ensure the safe operation of refueling, it is essential to use specialized explosion-proof electronic control devices to seal and protect these critical components, creating a reliable physical barrier that blocks the contact path between oil vapors and the electronic control components, providing a safe environment for their stable operation.

[0003] Existing electronically controlled explosion-proof devices for refueling truck reels still exhibit several shortcomings affecting safety and reliability during long-term use: First, the sealing structure design is relatively simple, mostly relying on a single sealing ring to achieve oil and gas barrier function, lacking an effective redundant protection mechanism. During refueling truck operation, the device experiences continuous shaking due to vehicle movement or operational vibrations. Simultaneously, the oil and gas in the oil-rich environment corrodes the sealing components. After prolonged use, the sealing components are prone to deterioration in sealing performance or even seal failure due to wear, aging, or corrosion. In this case, the single sealing structure cannot continuously and reliably block oil and gas penetration, leading to oil and gas entering the device and contacting the electronically controlled components, posing a significant safety hazard. Second, some devices lack a reasonable condensate drainage structure. In oil-rich environments, moisture in the air mixes with oil and gas, easily forming condensate on the inner wall of the device. If this condensate cannot be drained in time, it will gradually accumulate inside the device. The accumulated condensate not only accelerates the aging process of sealing components, reduces the service life and sealing effect of the seals, but also corrodes the device housing, damages the structural integrity of the housing, further weakens the overall explosion-proof performance, and significantly reduces the safety and reliability of the explosion-proof device. Utility Model Content

[0004] The main purpose of this invention is to overcome the defects of the existing technology and provide an electrically controlled explosion-proof device driven by a reel in a refueling truck that can enhance sealing redundancy, drain condensate, and improve explosion-proof reliability.

[0005] To achieve the above objectives, this utility model provides an electrically controlled explosion-proof device for a reel drive in a refueling truck, including a base and a cover plate. The base has a mounting groove for placing electrical components, and a sealing element is provided at the opening of the mounting groove. The cover plate is detachably installed on the base and used to cover the mounting groove. The opening of the mounting groove also has several grooves, and several protrusions are formed on the cover plate. The protrusions are inserted and engaged with the grooves to form an auxiliary sealing structure. Drainage holes are provided on the sidewalls of the grooves.

[0006] Preferably, a plurality of the grooves are evenly distributed circumferentially along the opening of the mounting groove, and a plurality of the protrusions correspond one-to-one with the grooves, and the protrusions are spaced apart from the inner wall of the groove to form a tortuous sealing channel.

[0007] Preferably, a plurality of protrusions are formed at intervals along the circumference of the groove opening of the mounting groove, the protrusions are located between adjacent grooves, and the cover plate has notches for the protrusions to extend into corresponding positions of the protrusions.

[0008] Preferably, the cover plate and the base are detachably connected by a locking assembly, the locking assembly including threaded holes formed on a plurality of the bosses, a plurality of through holes formed on the cover plate and corresponding to the threaded holes, and a locking bolt passing through the through holes and threadedly engaging with the threaded holes.

[0009] Preferably, the top of the protrusion is provided with a guide chamfer, and the edge of the groove is provided with a mating chamfer that matches the guide chamfer. When the protrusion and the groove are inserted, they are guided and positioned by the guide chamfer and the mating chamfer.

[0010] Preferably, the mounting groove has an annular sealing groove at its edge, and the sealing element is an O-ring embedded in the annular sealing groove. After the cover plate is closed, it is pressed tightly against the sealing element.

[0011] Preferably, a plurality of drainage holes are provided at intervals on the sidewall of the groove, and the diameter of each of the drainage holes is less than 1 mm.

[0012] Beneficial effects: 1. In the electrically controlled explosion-proof device for a reel drive of a refueling truck according to this utility model, the mounting groove provides an independent installation space for the electrical control components, enabling the electrical control components to form a preliminary physical isolation from the external oil-rich environment, thereby preventing oil and gas from directly contacting the electrical control components; at the same time, the sealing element set at the groove opening of the mounting groove can form a first sealing barrier when the cover plate is closed on the base, thereby initially blocking oil and gas from seeping into the interior of the mounting groove from the groove opening gap, thus providing basic protection for the electrical control components.

[0013] 2. In the electric explosion-proof device driven by the reel of the refueling truck of this utility model, the auxiliary sealing structure and the sealing element can form a double sealing protection. Even if the sealing performance of the sealing element decreases due to wear, aging or oil and gas corrosion after long-term use, the insertion and matching of the protrusion and the groove can still continuously block the entry of oil and gas by extending the oil and gas permeation path, which further improves the stability of the entire electric explosion-proof device in oil-rich operation scenarios.

[0014] 3. In the electrically controlled explosion-proof device driven by the reel of the refueling truck of this utility model, the condensate can be discharged to the outside of the device in a timely manner through the drain hole, thereby effectively avoiding the accumulation of condensate around the mounting groove and causing the seals to age faster, the sealing effect to decrease, or the base to corrode. This ensures the structural integrity and long-term stability of the sealing performance of the device, and further improves the safety and reliability of the entire electrically controlled explosion-proof device in oil-rich operation scenarios. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of an electrically controlled explosion-proof device driven by a reel in a refueling truck, according to an embodiment of this utility model. Figure 2 This is a half-sectional view of an embodiment of the present invention: an electrically controlled explosion-proof device driven by a reel in a refueling truck. Figure 3 yes Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is an exploded view of an embodiment of the present invention: an electrically controlled explosion-proof device driven by a reel in a refueling truck. Figure 5 This is a schematic diagram of the structure of the cover plate in an electronically controlled explosion-proof device driven by a reel in a refueling truck according to an embodiment of this utility model.

[0017] In the diagram: 1-base; 2-cover plate; 3-mounting groove; 4-seal; 5-groove; 6-protrusion; 7-drain hole; 8-bore; 9-annular sealing groove. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this application, it should be noted that the use of terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of terms such as "first" and "second" in the description of this application is only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not imply that the component is required to be absolutely horizontal or suspended, but rather that it may be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0023] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] Example 1: This utility model proposes an electrically controlled explosion-proof device driven by a reel in a refueling truck.

[0025] In one embodiment of this utility model, an electrically controlled explosion-proof device driven by a reel in a fuel truck includes a base 1 and a cover plate 2. The base 1 has an installation groove 3 for placing electrical components, and a sealing element 4 is provided at the opening of the installation groove 3. The cover plate 2 is detachably installed on the base 1 and is used to cover the installation groove 3. A plurality of grooves 5 are also provided at the opening of the installation groove 3. A plurality of protrusions 6 are formed on the cover plate 2, and the plurality of protrusions 6 are inserted and engaged with the grooves 5 to form an auxiliary sealing structure. Drainage holes 7 are provided on the side walls of the grooves 5.

[0026] Specifically, such as Figures 1 to 5 As shown, in the electrically controlled explosion-proof device for a refueling truck reel drive of this utility model, since the base 1 is provided with an installation groove 3, the installation groove 3 can provide independent installation space for electrical control components, such as controllers and relays, so that the electrical control components can form a preliminary physical isolation from the external oil-rich environment, thereby preventing oil and gas from directly contacting the electrical control components; at the same time, the sealing element 4 provided at the groove opening of the installation groove 3 can form a first sealing barrier when the cover plate 2 is closed on the base 1, thereby initially blocking oil and gas from penetrating into the interior of the installation groove 3 from the groove opening gap, thus providing basic protection for the electrical control components.

[0027] Furthermore, since several grooves 5 are provided at the opening of the mounting groove 3, and several protrusions 6 are formed on the cover plate 2 at the corresponding positions of the grooves 5, when the cover plate 2 is detachably installed to the base 1 and covers the mounting groove 3 by means of threaded connection or snap-fit, the protrusions 6 and grooves 5 are precisely inserted and matched one-to-one, thus forming an auxiliary sealing structure. This auxiliary sealing structure and the sealing element 4 at the opening of the groove form a double sealing protection. Even if the sealing performance of the sealing element 4 decreases due to wear, aging or oil and gas corrosion after long-term use, the insertion and matching of the protrusions 6 and grooves 5 can still continuously block the entry of oil and gas by extending the oil and gas permeation path, further improving the stability of the entire electronically controlled explosion-proof device in oil-rich operation scenarios.

[0028] Understandably, in this utility model's electrically controlled explosion-proof device for a refueling truck reel drive, a drain hole 7 is provided on the side wall of the groove 5. In a rich oil environment, condensate formed by the mixture of water vapor in the air and oil vapor will accumulate in the groove 5. The drain hole 7 can promptly discharge this condensate to the outside of the device, effectively preventing condensate from accumulating around the mounting groove 3 and causing accelerated aging of the seal 4, reduced sealing effect, or corrosion of the base 1. This ensures the structural integrity and long-term stability of the sealing performance of the device, further improving the safety and reliability of the entire electrically controlled explosion-proof device in rich oil operation scenarios. Furthermore, it should be noted that the drain hole 7 does not affect the sealing performance of the mounting groove 3. On the one hand, the drain hole 7 is not directly connected to the interior of the mounting groove 3, but is opened on the side wall of the groove 5. The groove 5 is a component of the auxiliary sealing structure, and the tortuous channel formed by its insertion with the protrusion 6 constitutes the first barrier against oil and gas penetration. On the other hand, the drain hole 7 is designed only to drain the condensate accumulated in the groove 5. Its diameter is small and its position avoids the main sealing area, so it will not form a shortcut for oil and gas penetration. At the same time, combined with the double protection of the sealing element 4 and the auxiliary sealing structure, it can ensure that the sealing performance of the mounting groove 3 is not affected while realizing the function of condensate drainage, thus achieving the synergistic compatibility of sealing protection and drainage function.

[0029] In one embodiment, a plurality of grooves 5 are evenly distributed circumferentially along the opening of the mounting groove 3, and a plurality of protrusions 6 correspond one-to-one with the grooves 5, with the protrusions 6 spaced apart from the inner wall of the grooves 5 to form a tortuous sealing channel. Specifically, as shown... Figures 1 to 3As shown, several grooves 5 are evenly distributed circumferentially along the opening of the mounting groove 3. This layout allows the auxiliary sealing structure to form a continuous and balanced protective ring at the opening of the mounting groove 3, avoiding localized weak seals due to uneven distribution of grooves 5. This ensures that oil and gas can be intercepted by the auxiliary sealing structure no matter which direction the groove attempts to penetrate. Simultaneously, several protrusions 6 on the cover plate 2 are correspondingly arranged with the grooves 5, ensuring precise insertion and fitting. Each groove 5 can form an independent sealing unit with its corresponding protrusion 6, thus combining to form a complete auxiliary sealing barrier. Crucially, the protrusions 6 and the inner walls of the grooves 5 are spaced apart. This design is not a gap defect, but a deliberately constructed tortuous sealing channel. When oil and gas attempt to pass through the auxiliary sealing structure, they cannot penetrate in a straight line and must meander through the gap between the protrusions 6 and the inner walls of the grooves 5. This tortuous path significantly extends the penetration distance of the oil and gas, while increasing the probability of collisions between oil and gas molecules and the groove walls, thus significantly reducing penetration efficiency. This structural design further compensates for the shortcomings of the existing single sealing structure, making the dual protection of the main seal 4 and the auxiliary sealing structure more layered and reliable. Even if the main seal 4 experiences slight wear or failure, the tortuous sealing channel can still effectively prevent oil and gas from entering the installation groove 3, further improving the explosion-proof redundancy and long-term safety and stability of the device.

[0030] In one embodiment, a plurality of protrusions 8 are formed at circumferential intervals at the opening of the mounting groove 3. The protrusions 8 are located between adjacent grooves 5, and notches are provided on the cover plate 2 corresponding to the positions of the protrusions 8 for the protrusions 8 to extend into. Specifically, as shown in the figure... Figures 2 to 5 As shown, several protrusions 8 are formed at intervals along the circumference of the groove opening of the mounting groove 3, and the protrusions 8 are located between adjacent grooves 5. This layout design not only avoids interference between the protrusions 8 and the grooves 5, but also makes full use of the space around the groove opening, making the structural layout more compact and reasonable. It should be noted that the protrusions 8 are not additional redundant components, but rather form a precise fit with the notch on the cover plate 2: when the cover plate 2 is closed onto the base 1, the protrusions 8 on the base 1 can extend into the notch of the cover plate 2 and form a mechanical positioning structure, effectively limiting the horizontal displacement of the cover plate 2, ensuring the precise relative position between the cover plate 2 and the base 1, and thus ensuring the fitting accuracy of the protrusions 6 and the grooves 5, avoiding uneven gaps in the tortuous channels of the auxiliary sealing structure due to assembly misalignment, which would affect the oil and gas barrier effect.

[0031] In one embodiment, the cover plate 2 and the base 1 are detachably connected by a locking assembly. The locking assembly includes threaded holes formed on a plurality of bosses 8, a plurality of through holes formed on the cover plate 2 and corresponding to the threaded holes, and a locking bolt passing through the through holes and threadedly engaging with the threaded holes. Specifically, as shown... Figure 1 and Figure 4As shown, a threaded hole is formed on the boss 8, and a through hole is formed at the corresponding position on the cover plate 2. A locking bolt passes through the through hole and engages with the threaded hole, allowing the cover plate 2 to be detachably fixed to the base 1. The structural design is simple and reasonable. Understandably, when it is necessary to inspect or replace the electrical control components, the operator only needs to loosen the locking bolt to remove the cover plate 2. The operation is simple, convenient, and efficient, and the disassembly and assembly process will not damage the sealing element 4 or the auxiliary sealing channel, ensuring that the device maintains good sealing performance even after multiple disassembly and assembly.

[0032] In one embodiment, the top of the protrusion 6 is provided with a guide chamfer, and the edge of the groove 5 is provided with a mating chamfer that matches the guide chamfer. When the protrusion 6 and the groove 5 are inserted, they are guided and positioned by the guide chamfer and the mating chamfer. Specifically, as shown in the figure... Figure 3 As shown, the synergistic effect of the guide chamfer and the mating chamfer creates a natural guide trajectory: when the cover plate 2 closes onto the base 1, the guide chamfer at the tip of the protrusion 6 first contacts the mating chamfer at the opening of the groove 5. The inclined guide automatically corrects the horizontal offset of the cover plate 2, guiding the protrusion 6 precisely to align with the groove 5 and insert smoothly. This eliminates the need for repeated alignment adjustments by the operator, significantly improving assembly efficiency. Simultaneously, the chamfer structure avoids rigid collisions between the protrusion 6 and the edge of the groove 5, reducing wear on the contact surfaces during insertion, ensuring the long-term integrity of the auxiliary sealing structure, and ensuring that the uniformity of the gap in the tortuous sealing channel is not affected by the assembly operation.

[0033] In one embodiment, an annular sealing groove 9 is provided at the edge of the groove opening of the mounting groove 3, and the sealing element 4 is an O-ring fitted into the annular sealing groove 9. After the cover plate 2 is closed, it is pressed tightly against the sealing element 4. Specifically, as shown... Figures 1 to 4 As shown, the annular sealing groove 9 provides a stable installation and positioning space for the seal 4. Even under continuous vibration during refueling truck operation, the sealing ring can remain in the preset sealing position, preventing gaps from appearing on the sealing surface due to vibration displacement. Furthermore, when the cover plate 2 is fitted onto the base 1 via the locking assembly, the inner end face of the cover plate 2 is pressed tightly against the O-ring seal in the annular sealing groove 9. Under pressure, the O-ring seal undergoes elastic deformation, completely filling the tiny gap between the cover plate 2 and the sealing groove, forming a tight, gapless sealing barrier. Compared to rigid sealing, this elastic sealing method is better able to adapt to minor assembly errors between the cover plate 2 and the base 1. At the same time, the O-ring seal has good resistance to oil and gas corrosion and aging, maintaining its elasticity in oil-rich environments for a long time, reducing the decline in sealing performance caused by oil and gas erosion, and ensuring the long-term reliability of the sealing structure.

[0034] In one embodiment, a plurality of drainage holes 7 are spaced apart on the sidewall of the groove 5, and the diameter of each drainage hole 7 is less than 1 mm. Specifically, as shown in the figure... Figure 4 and Figure 5As shown, the spaced drainage holes 7 ensure that condensate from each area of ​​the groove 5 can quickly flow out of the device, achieving multi-point drainage and effectively preventing local water accumulation. More importantly, since the diameter of each drainage hole 7 is less than 1 mm, from a physical perspective, condensate can be smoothly discharged through drainage holes of this size under the action of surface tension. However, the effective permeation channel size of oil and gas molecules in oil-rich environments is usually larger than this value. Furthermore, since the drainage holes 7 are located on the side wall of the groove 5, they must first break through the tortuous sealing channel formed by the protrusion 6 and the groove 5 to enter the device. Combined with the limitation of a pore size of less than 1 mm, oil and gas molecules have difficulty permeating through the micropores, thus preventing the drainage holes 7 from becoming a shortcut for oil and gas leakage. The structural design is simple and reasonable.

[0035] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electrically controlled explosion-proof device driven by a reel in a refueling truck, comprising a base (1), characterized in that, It also includes a cover plate (2), and the base (1) is provided with a mounting groove (3) for placing electrical components. A sealing element (4) is provided at the opening of the mounting groove (3). The cover plate (2) is detachably installed on the base (1) and is used to cover the mounting groove (3). Several grooves (5) are also provided at the opening of the mounting groove (3). Several protrusions (6) are formed on the cover plate (2). Several protrusions (6) are inserted and engaged with the grooves (5) to form an auxiliary sealing structure. Drainage holes (7) are provided on the side wall of the grooves (5).

2. The electrically controlled explosion-proof device driven by a reel in a refueling truck according to claim 1, characterized in that, A plurality of grooves (5) are evenly distributed around the opening of the mounting groove (3), and a plurality of protrusions (6) correspond one-to-one with the grooves (5), and the protrusions (6) are spaced apart from the inner wall of the grooves (5) to form a tortuous sealing channel.

3. The electrically controlled explosion-proof device for a reel-driven fuel truck according to claim 2, characterized in that, The mounting groove (3) has several protrusions (8) spaced around its circumference at the groove opening. The protrusions (8) are located between adjacent grooves (5). The cover plate (2) has notches corresponding to the positions of the protrusions (8) for the protrusions (8) to extend into.

4. The electrically controlled explosion-proof device for a reel drive in a refueling truck according to claim 3, characterized in that, The cover plate (2) and the base (1) are detachably connected by a locking assembly. The locking assembly includes threaded holes opened on a plurality of the bosses (8), a plurality of through holes opened on the cover plate (2) and corresponding to the threaded holes, and a locking bolt that passes through the through holes and is threadedly engaged with the threaded holes.

5. An electrically controlled explosion-proof device for a reel drive in a refueling truck according to any one of claims 1-4, characterized in that, The top of the protrusion (6) is provided with a guide chamfer, and the groove edge of the groove (5) is provided with a matching chamfer that matches the guide chamfer. When the protrusion (6) and the groove (5) are inserted, they are guided and positioned by the guide chamfer and the matching chamfer.

6. An electrically controlled explosion-proof device for a reel drive in a refueling truck according to any one of claims 1-4, characterized in that, The mounting groove (3) has an annular sealing groove (9) at its edge. The sealing element (4) is an O-ring that is embedded in the annular sealing groove (9). After the cover plate (2) is closed, it is pressed tightly against the sealing element (4).

7. An electrically controlled explosion-proof device for a reel drive in a refueling truck according to any one of claims 1-4, characterized in that, The groove (5) has a plurality of drainage holes (7) spaced apart on its sidewall, and the diameter of each drainage hole (7) is less than 1 mm.

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