Low-temperature fueling machine pipe with high electrostatic safety performance

Abstract

The utility model discloses a low temperature oiling machine pipe of high electrostatic safety performance, including the main pipe body, and the main pipe body is provided with inner adhesive layer, first support layer, middle adhesive layer, second support layer and outer adhesive layer from inside to outside in proper order, first support layer and second support layer are all fiber woven structure, and the continuous wire is arranged between first support layer and second support layer, and the wire is electrically connected with the ground of oiling machine. The low temperature oiling machine pipe of high electrostatic safety performance can greatly reduce the tensile load, is not easy to produce fatigue fracture, and guarantees that static electricity can be led out in time.

Description

Technical Field

[0001] This utility model relates to the field of fuel dispenser pipe technology, specifically to a low-temperature fuel dispenser pipe with high electrostatic conductivity and safety performance. Background Technology

[0002] In tropical, subtropical, or temperate regions, the reinforcing layer of fuel dispenser hoses used in gas stations typically employs a steel wire braided structure. This structure is robust, stable, and resistant to deformation, capable of withstanding significant positive and negative pressures and external impacts. However, in frigid regions where temperatures drop below -40°C, this steel wire braided hose becomes rigid and unable to bend properly, making refueling operations extremely difficult. Therefore, low-temperature fuel dispenser hoses used in frigid regions must maintain a relatively flexible state under low-temperature conditions to function correctly.

[0003] Current technology typically involves replacing the reinforcing layer with a single layer of fiber braiding, with a single stainless steel wire conductor arranged linearly along the product's axial direction beneath the fiber braiding layer. This conductor consists of dozens of stainless steel wires with a diameter of approximately 0.1-0.2 mm. The purpose of this stainless steel wire conductor is to promptly release static electricity by connecting to the metal connectors at both ends of the fuel dispenser pipe, preventing deflagration accidents at gas stations. However, practical use has revealed two significant drawbacks to this structure: First, because the stainless steel wire conductor directly contacts the inner rubber layer, it is prone to embedding itself into the inner rubber layer during production, resulting in locally insufficient thickness of the inner rubber layer. This can lead to cracks in the inner rubber layer during use, causing product leakage and failure. Second, because the stainless steel wire conductor is arranged linearly along the product's axial direction, it is subjected to tensile loads in the bending direction during use. Repeated bending can cause fatigue and breakage, thus failing to discharge static electricity. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a low-temperature refueling pipe with high electrostatic conductivity and safety performance, which can greatly reduce the tensile load it is subjected to, is not prone to fatigue fracture, and ensure that static electricity can be discharged in time.

[0005] The objective of this utility model is achieved through the following technical solution: A low-temperature refueling hose with high electrostatic conductivity and safety performance is characterized in that it includes a main body, wherein the main body is provided with an inner rubber layer, a first support layer, a middle rubber layer, a second support layer and an outer rubber layer from the inside to the outside. Both the first support layer and the second support layer are fiber braided structures; A continuous conductor is provided between the first support layer and the second support layer, and the conductor is electrically connected to the ground of the fuel dispenser.

[0006] In one optional embodiment, an elastic portion is formed on the conductor, and a plurality of the elastic portions are linearly arranged along the length direction of the conductor, thereby giving the conductor an elastic force that can stretch or retract in the axial direction of the main body.

[0007] In one alternative embodiment, the elastic portion is S-shaped.

[0008] In one alternative embodiment, the elastic portion is zigzag-shaped.

[0009] In one alternative embodiment, the conductor is composed of a plurality of continuous strands of metal wire.

[0010] In one optional embodiment, the metal wire is a stainless steel wire.

[0011] In one optional embodiment, the stainless steel wire has an outer diameter of 0.1 mm.

[0012] In one alternative embodiment, the conductor is made of 50-60 strands of stainless steel wire.

[0013] In one optional embodiment, it further includes a first pipe connector and a second pipe connector, which are respectively disposed at both ends of the main pipe body; the first pipe connector and the second pipe connector are both metal connectors, and the first pipe connector and the second pipe connector are respectively connected to both ends of the wire.

[0014] In one optional embodiment, both the first support layer and the second support layer are woven from several strands of high-strength polyester fiber filaments.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention relates to a cryogenic fuel dispenser hose with high electrostatic conductivity and safety performance. It employs a double-layer fiber braided structure, with a first support layer and a second support layer respectively on the inner and outer layers of the conductor. The conductor is arranged between the two fiber braided layers to prevent it from getting stuck in the inner layer during production. By forming continuous S-shaped or zigzag elastic sections along the length of the conductor, the conductor possesses elastic force capable of stretching or retracting axially in the main body. This allows the conductor to straighten and contract like a spring when the cryogenic fuel dispenser hose is bent, significantly reducing the tensile load and minimizing fatigue fracture. It also ensures timely discharge of static electricity, preventing deflagration accidents at gas stations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the cryogenic refueling pipe with high electrostatic conductivity and safety performance in Example 1; Figure 2 This is a schematic diagram of the cross-section of the cryogenic refueling pipe with high electrostatic conductivity and safety performance in Example 1; Figure 3 This is a schematic diagram of the conductor structure of the cryogenic refueling pipe with high electrostatic conductivity safety performance in Example 1; Figure 4 This is a schematic diagram of the conductor structure of another embodiment of the cryogenic refueling pipe with high electrostatic conductivity safety performance in Example 1.

[0017] In the diagram: 1. Inner adhesive layer; 2. First support layer; 3. Conductor; 31. Elastic part; 4. Second support layer; 5. Outer adhesive layer; 6. Middle adhesive layer. Detailed Implementation

[0018] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0019] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0020] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0021] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0022] Example 1: Please refer to Figure 1-4 This embodiment provides a low-temperature refueling pipe with high electrostatic conductivity and safety performance, including a main body, which is a pipe structure with an internal cavity for oil flow.

[0023] The main body is provided with an inner rubber layer 1, a first support layer 2, a middle rubber layer 6, a second support layer 4 and an outer rubber layer 5 from the inside to the outside, and a wire 3 is provided between the first support layer 2 and the second support layer 4. The wire 3 is electrically connected to the ground of the fuel dispenser.

[0024] The main function of the inner rubber layer 1 in this embodiment is to directly contact the transported oil to ensure that no leakage or corrosion occurs. It can be made of materials such as nitrile rubber (NBR), fluororubber (FKM), polyethylene (PE), or polyurethane (PU), ensuring that it not only has corresponding low-temperature resistance but also excellent chemical stability in low-temperature environments.

[0025] In this embodiment, both the first support layer 2 and the second support layer 4 are woven from several strands of high-strength polyester fiber, such as aramid fiber (e.g., Kevlar) or polyurethane, which have high flexibility, allowing the fuel dispenser pipe to maintain its mechanical properties and strength at low temperatures and exhibiting good cold resistance. The first support layer 2, located near the inner rubber layer 1, has a relatively dense weave density of approximately 60%. Its function is to withstand the working pressure of the conveyed medium. Since the working pressure of the low-temperature fuel dispenser pipe is not high, with a maximum working pressure of 250 PSI (1.724 MPa), a high weave density is not necessary. Correspondingly, the second support layer 4 has a weave density of approximately 30%, primarily used to fix the metal conductor 3.

[0026] A middle rubber layer 6, approximately 0.3 mm thick, is disposed between the first support layer 2 and the second support layer 4. This middle rubber layer 6 effectively encapsulates the metal wire 3, preventing displacement. By acting as a buffer structure between the two support layers, the middle rubber layer 6 ensures that the first support layer 2 and the second support layer 4 adhere together, preventing premature damage caused by mutual friction during use. Materials suitable for the middle rubber layer include fluororubber (FKM), polyurethane (PU), and nitrile rubber (NBR). These materials possess good low-temperature resistance, oil resistance, and aging resistance, ensuring that the fuel dispenser pipeline maintains good interlayer adhesion, sealing, and mechanical strength even at low temperatures, preventing problems such as material embrittlement, interlayer separation, or oil leakage caused by low temperatures.

[0027] The main function of the outer rubber layer 5 in this embodiment is to protect the cryogenic fuel dispenser pipe from external environmental factors such as mechanical damage, ultraviolet radiation, and chemical corrosion, while ensuring the flexibility and durability of the cryogenic fuel dispenser pipe. It can be made of chlorinated polyethylene rubber (CPE), rubber-plastic alloy (NBR / PVC blend), fluororubber (FKM), polyurethane (PU), ethylene propylene rubber (EPDM), etc., which have excellent weather resistance, oil resistance, flame retardancy, low-temperature resistance, wear resistance, ultraviolet radiation resistance, and corrosion resistance.

[0028] In this embodiment, a first support layer 2 and a second support layer 4 are respectively provided on the inner and outer layers of the conductor 3. A double-layer fiber braided structure is adopted, and the conductor 3 is arranged between the two fiber layers to prevent the conductor 3 from getting stuck in the inner rubber layer 1 during the production process. Furthermore, the inner rubber layer 1 and the middle rubber layer 6 can permeate and cross-link with each other through the braiding gaps of the first support layer 2, forming a solid whole with the first support layer 2. Then, a 0.3mm thick middle rubber layer 6 is wrapped around the surface of this braided layer, and the metal conductor 3 is laid on the surface of the middle rubber layer 6 along the product axis. Then, the second support layer 4 is braided to fix the metal conductor. Similarly, the lower braiding density of the second support layer 4 allows the middle rubber layer 6 and the outer rubber layer 5 to permeate each other, so that the inner rubber layer 1, the first support layer 2, the middle rubber layer 6, the conductor 3, the second support layer 4, and the outer rubber layer 5 are cross-linked to form a solid whole.

[0029] Furthermore, the conductor 3 in this embodiment has elastic portions 31 formed on it, and a plurality of such elastic portions 31 are linearly arranged along the length direction of the conductor 3, thereby giving the conductor 3 an elastic force capable of stretching or retracting in the axial direction of the main body. This allows the conductor 3 to straighten and retract like a spring when the fuel dispenser pipe is bent at low temperatures, greatly reducing the tensile load it receives, making it less prone to fatigue fracture, and ensuring that static electricity can be discharged in a timely manner.

[0030] In this embodiment, a plurality of positioning points are provided along the length of the conductor 3, which fix the conductor between the first support layer 2 and the second support layer 4. The positioning points are spaced apart mainly to limit excessive displacement of the conductor 3 during use, but will not affect the straightening and contraction of the conductor 3 itself, as will be understood by those skilled in the art.

[0031] The positioning points can be chemical anchors formed by bonding the wire 3 to the first support layer 2 or the second support layer 4 at discrete points using local impregnation adhesive or hot melting. Alternatively, the positioning points can be formed by introducing a locking wire along the length of the wire 3 and sewing the wire between the first support layer 2 and the second support layer 4 to form continuous positioning points that hold the wire in place. By setting positioning points to fix the wire 3 between the first support layer 2 and the second support layer 4, excessive axial sliding or rotation of the wire 3 is prevented. This effectively avoids problems such as poor contact or wear on the outer material caused by the aging or wear of the support layers after long-term use due to the wire 3 being sandwiched between the two support layers (2, 4).

[0032] In other embodiments, a PTFE coating or an ultra-high molecular weight polyethylene film can be applied to the outside of the conductor 3. This can form a low-friction, wear-resistant buffer layer between the first support layer 2, the second support layer 4 and the conductor 3, reducing wear.

[0033] Please refer to Figure 4 As shown, the elastic part in this embodiment can be zigzag-shaped. Several zigzag-shaped parts are connected end to end to form a continuous wire embedded between the first support layer 2 and the second support layer 4. Under the premise of ensuring excellent elasticity, it has the advantages of simple structure and low processing cost.

[0034] Please refer to Figure 3 As shown, the elastic part in this embodiment can be S-shaped. Several S-shaped sections are connected end to end to form a continuous conductor embedded between the first support layer 2 and the second support layer 4. The S-shaped elastic part has a rounded transition section, which greatly improves durability while ensuring excellent elasticity. In this embodiment, by designing the conductor 3 as S-shaped and using a smooth, large-radius arc transition, sharp corners are avoided, reducing local stress concentration and wear of the conductor during expansion and contraction.

[0035] Of course, the shape of the elastic part can also be a combination of zigzag and S-shape, both of which can provide elastic force for the conductor 3 to stretch or retract axially in the main body.

[0036] In this embodiment, the wire 3 is embedded between the first support layer 2 and the second support layer 4. The cross-section of the wire 3 has an arc that adapts to the wall of the fuel dispenser pipe, so that it can be easily fixed to one side inside the fuel dispenser pipe, providing a connection surface that fits with the inner and outer sides of the first support layer 2 and the second support layer 4.

[0037] The conductor 3 is composed of several continuous metal round wires stranded together; in this embodiment, the metal round wires are stainless steel wires. This allows it to maintain sufficient toughness and durability at low temperatures.

[0038] Furthermore, in this embodiment, the conductor 3 is composed of 50-60 strands of stainless steel wire with an outer diameter of 0.1 mm, such as 304L stainless steel microwires. These microwires maintain good toughness and plasticity even at temperatures above -196°C. The multi-strand strand structure itself endows the conductor with extremely high flexibility and resistance to bending fatigue, and even if a single filament breaks, it does not affect the overall conductive path. By distributing external forces through the multi-strand filament structure, the flexibility, resistance to low-temperature brittleness, conductivity, and fatigue resistance of the conductor 3 are improved, reducing damage caused by uneven stress or changes in external temperature, and effectively preventing brittle fracture in low-temperature environments.

[0039] In some embodiments, a first pipe connector and a second pipe connector are further included, which are respectively disposed at both ends of the main pipe body. Both the first and second pipe connectors are metal connectors, and are respectively connected to both ends of the conductor 3. In this embodiment, the first and second pipe connectors are made of low-temperature austenitic stainless steel (such as 304L or 316L), or low-temperature alloy steel, and undergo appropriate heat treatment to refine the grains and improve low-temperature impact toughness. By connecting the conductor 3 to the metal connectors at both ends of the main pipe body, static electricity is released in a timely manner, preventing deflagration accidents at the gas station.

[0040] To avoid low-temperature brittleness or contact resistance problems at the connection points of the first and second pipe joints and the wire 3, stress relief sections can be provided at the connection points of the first and second pipe joints and the wire 3.

[0041] The stress relief section can be a flared opening or a gradually expanding guide cavity formed within the first or second pipe joint, or a stress relief sleeve fitted over the outside of the cryogenic refueling pipe and mating with the first or second pipe joint. This allows the inner and outer adhesive layers (1, 5), support layers (2, 4), and conductor 3 of the high electrostatic conductivity cryogenic refueling pipe end in this embodiment to smoothly transition into the pipe joint, providing internal buffer space for the expansion and contraction of conductor 3 during bending, and preventing the force from being directly transmitted to the vulnerable connection point. A buffer adhesive can be installed inside the stress relief section. This buffer adhesive is formed by injecting highly conductive, low-temperature flexible epoxy resin or silicone gel into the gap between the stress relief section and the conductor. It is used to buffer vibration and bending stress between the conductor and the joint, providing redundant conductive paths, protecting the connection point, and further improving the stability of the connection between the first and second pipe joints and the conductor 3. This constructs a robust and reliable cryogenic refueling pipe system that is adapted to extreme cold environments throughout the entire chain, from the inner adhesive layer and conductive system to the metal joint.

[0042] The high-conductivity, low-temperature fuel dispenser hose described in this embodiment is also applicable to marine fuel dispenser hoses and other fuel dispenser hoses that require flexibility, easy installation, and bending due to limitations in the application environment.

[0043] Although certain components and embodiments of this application have been illustrated and described, many modifications and alterations (e.g., variations in the size, dimensions, structure, shape and proportion of the various elements, installation arrangement, material use, color, orientation, etc.) will be conceived by those skilled in the art without actually departing from the scope and spirit of the claims.

[0044] Finally, it should be noted that the above embodiments are only preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A cryogenic refueling hose with high electrostatic conductivity and safety performance, characterized in that, The main body includes a main tube, which is provided with an inner adhesive layer, a first support layer, a middle adhesive layer, a second support layer and an outer adhesive layer from the inside to the outside. Both the first support layer and the second support layer are fiber braided structures; A continuous conductor is provided between the first support layer and the second support layer, and the conductor is electrically connected to the ground of the fuel dispenser.

2. The cryogenic refueling hose with high electrostatic conductivity and safety performance according to claim 1, characterized in that, The conductor has elastic portions formed thereon, and a plurality of such elastic portions are linearly arranged along the length of the conductor, thereby giving the conductor an elastic force that can stretch or retract in the axial direction of the main body.

3. The cryogenic refueling hose with high electrostatic conductivity and safety performance according to claim 2, characterized in that, The elastic part is S-shaped.

4. A cryogenic refueling hose with high electrostatic conductivity and safety performance according to claim 2, characterized in that, The elastic part is zigzag-shaped.

5. A cryogenic refueling hose with high electrostatic conductivity and safety performance according to claim 1, characterized in that, The conductor is made up of several continuous strands of metal wire.

6. The cryogenic refueling hose with high electrostatic conductivity and safety performance according to claim 5, characterized in that, The metal wire is stainless steel wire.

7. A cryogenic refueling hose with high electrostatic conductivity and safety performance according to claim 6, characterized in that, The outer diameter of the stainless steel wire is 0.1 mm.

8. A cryogenic refueling hose with high electrostatic conductivity and safety performance according to claim 7, characterized in that, The conductor is made of 50-60 strands of stainless steel wire.

9. A cryogenic refueling hose with high electrostatic conductivity and safety performance according to claim 1, characterized in that, It also includes a first pipe connector and a second pipe connector, which are respectively disposed at both ends of the main pipe body; both the first pipe connector and the second pipe connector are metal connectors, and the first pipe connector and the second pipe connector are respectively connected to both ends of the wire.

10. A cryogenic refueling hose with high electrostatic conductivity and safety performance according to claim 1, characterized in that, Both the first support layer and the second support layer are woven from several strands of high-strength polyester fiber filaments.

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