Explosion-proof structure

Abstract

The utility model relates to an explosion-proof structure, belongs to the technical field of blocking and explosion prevention, and solves the problems that in the prior art, an explosion-proof structure is large in filling density, poor in fluidity in the filling process, needs to be further improved in flame-retardant and explosion-proof performance and structural strength, and poor in product process stability. The utility model provides an explosion-proof structure. The explosion-proof structure comprises an outer pipe body 1, an inner pipe body 3 and a supporting sheet 2, wherein the outer pipe body 1, the inner pipe body 3 and the supporting sheet 2 are coaxially arranged from outside to inside; the supporting sheet 2 is connected with the outer surface of the inner pipe body 3 and the inner surface of the outer pipe body 1; the outer pipe body 1 and the inner pipe body 3 are both truncated cones, and the large end face and the small end face of the outer pipe body 1 and the large end face and the small end face of the inner pipe body 3 are oppositely arranged. The explosion-proof structure is high in structural strength and reasonable in layout, flame propagation can be effectively restrained, explosion pressure waves are sharply attenuated, and the explosion-proof performance is excellent; the flame retardant property is not lower than V-0 level, the compression strength is not lower than 15MPa, and the filling density can be as low as 55.87 kg / m < 3 >.

Description

Technical Field

[0001] The utility model relates to the technical field of explosion isolation and prevention, and particularly relates to an explosion-proof structure. Background Art

[0002] The explosion isolation and prevention technology is a technology that can effectively prevent the explosion of inflammable and explosive gaseous and liquid hazardous chemicals caused by accidental accidents (such as static electricity, welding, shooting, collision, wrong operation, etc.) during storage and transportation. Installing explosion-proof materials with explosion-proof functions in containers can fundamentally solve the problems of combustion, explosion and other dangers that occur during the storage, transportation and use of inflammable and explosive liquid and gaseous hazardous chemicals.

[0003] The explosion-proof material is specifically a honeycomb structure, which can divide the interior of the storage and transportation containers of inflammable and explosive liquid and gaseous hazardous chemicals into several "small chambers" or "cavities". These "small chambers" or "cavities" can effectively contain the spread of flames and sharply attenuate the explosion pressure wave. At the same time, this honeycomb-structured material has a high surface efficiency per unit volume, so it has good heat absorption, can quickly absorb the heat released by combustion, reduce the temperature after the combustion reaction, shrink the expansion degree of the reaction gas, and increase the pressure value in the container not much, so that the combustion speed cannot reach the explosion limit speed, thus achieving the purpose of explosion prevention.

[0004] At present, the existing explosion-proof materials generally have defects such as large filling density, poor fluidity during the filling process, insufficient structural strength, poor flame retardant and explosion-proof performance, poor product stability, and poor corrosion resistance. Problems such as collapse and slag falling are likely to occur, and they cannot meet the flame retardant and explosion-proof requirements under special conditions. Content of the Utility Model

[0005] In view of the above analysis, the utility model aims to provide an explosion-proof structure to solve at least one of the problems of the existing explosion-proof materials, such as large filling density, poor fluidity during the filling process, insufficient structural strength, poor flame retardant and explosion-proof performance, poor product stability, poor corrosion resistance, easy collapse, slag falling, etc.

[0006] The purpose of the utility model is mainly achieved through the following technical solutions:

[0007] The utility model provides an explosion-proof structure, which includes an outer pipe body 1, an inner pipe body 3 arranged coaxially from outside to inside, and a support sheet 2 connecting the outer surface of the inner pipe body 3 and the inner surface of the outer pipe body 1;

[0008] Both the outer pipe body 1 and the inner pipe body 3 are frustum cones, and the large and small end faces of the outer pipe body 1 and the inner pipe body 3 are arranged in opposite directions.

[0009] Preferably, the frustum cone is a circular frustum or a regular pyramid frustum.

[0010] Particularly preferably, the regular frustum is a regular frustum with 2, 4, 6, 8, 10, or 12 sides.

[0011] Specifically, the outer tube body 1 and the inner tube body 3 have the same length and their end faces are flush.

[0012] Specifically, the support piece 2 connecting the outer surface of the inner tube body 3 and the inner surface of the outer tube body 1 is a trapezoidal support piece 2.

[0013] Furthermore, the side waist of the trapezoidal support piece 2 is connected to the generatrix and / or the side edge of the outer tube body 1 and the inner tube body 3; the trapezoidal support piece 2 is arranged radially and evenly distributed along the circumference.

[0014] Furthermore, a weight reduction notch is provided on the non-connecting side of the trapezoidal support piece 2.

[0015] Furthermore, the explosion-proof structure is divided into a plurality of identical divided areas by the support piece 2, and through holes are provided on the outer tube body 1 and the inner tube body 3 corresponding to each divided area.

[0016] Furthermore, the inner tube body 3 is a multi-layer structure.

[0017] Furthermore, the angle between the generatrix or the side edge of the outer tube body 1 and the inner tube body 3 and the axis is 0.5 to 30°.

[0018] Compared with the prior art, the present utility model can at least achieve one of the following beneficial effects:

[0019] 1. The explosion-proof structure provided by the present utility model forms stable and multiple small compartments with a certain blocking effect through the outer tube body 1, the inner tube body 3, and the trapezoidal support piece 2. These small compartments can effectively contain the spread of flames, causing the explosion pressure wave to decay sharply; at the same time, this material has a high surface efficiency per unit volume and good heat absorption, and can quickly absorb the heat released by combustion, reducing the temperature after the combustion reaction, shrinking the expansion degree of the reaction gas, and the pressure value in the container does not increase much, so that the combustion speed cannot reach the explosion limit speed, thereby achieving the purpose of explosion protection.

[0020] Among them, it is particularly worth emphasizing that the outer tube body 1 is a frustum, preferably a frustum of a cone or a regular frustum, the inner tube body 3 is a frustum, preferably a frustum of a cone or a regular frustum; the small end face of the outer tube body 1 is flush with the large end face of the inner tube body 3, and the large end face of the outer tube body 1 is flush with the small end face of the inner tube body 3; that is to say, the outer tube body 1 and the inner tube body 3 are arranged in the opposite direction (see Figure 1 ). The above setting makes the small compartments form a trapezoidal structure in the axial cross-section. The trapezoidal small compartments have greatly improved structural strength and stability compared with the small compartments with the same width in the axial direction in the prior art, can withstand stronger explosion shock waves, and have a more excellent explosion-proof effect.

[0021] Secondly, since the outer tube body 1 is designed in a frustum shape or a regular prism frustum shape, it is more stable in the container under normal assembly conditions and is not prone to shaking and collision, which not only extends the service life of the explosion-proof structural member but also protects the inner wall of the container.

[0022] The explosion-proof structure also adds a circular or polygonal connecting piece 4 on the small end face of the inner tube body 3. On the one hand, the connecting piece 4 can further improve the overall strength of the structural member, and on the other hand, it also provides an axial partition, which is beneficial to improving the explosion-proof performance.

[0023] In addition, the connecting piece 4 can be used as an injection port for the injection molding process, so that the structural member can meet the requirements of the injection molding process. When the modified resin and the injection molding process are used to prepare the structural member, the entire structural member can have excellent flame-retardant and explosion-proof performance and a smoother surface, and the product stability is greatly improved.

[0024] 2. The filling density of the explosion-proof structure is small, and it has little influence on the flow of the liquid in the container (good fluidity during the filling process). The explosion-proof structure is provided with through holes on the outer tube body 1 and the inner tube body 3, and by limiting the area ratio of the through holes, on the premise of ensuring the strength and flame-retardant and explosion-proof performance of the explosion-proof structure, the influence on the flow of the fluid medium is significantly reduced. Tests show that the influence on the flow velocity of the fluid medium does not exceed 0.5%.

[0025] On the other hand, the opening of the through holes also effectively reduces the weight and volume of the explosion-proof structure, avoids occupying too much internal space in the container, helps to reduce the filling density of the explosion-proof structure, and the filling density of the explosion-proof structure can reach as low as 55.87 kg / m³ at the lowest.

[0026] In addition, during the filling process of the explosion-proof structure, there is no dislocation or crossing between the unit bodies, and the fluidity is better. There is crossing between the unit bodies of the explosion-proof structure in the prior art (for example, various auxiliary support structures set in the prior art to improve the structural strength, resulting in structures such as "crossbeams" in the internal space of the small compartments; or the small compartments are not axially penetrated). The crossed unit bodies will cause problems such as an increase in the filling density and an influence on the flow of the fluid medium; the filling density of the explosion-proof structure can reach as low as 55.87 kg / m 3 。

[0027] 3. The explosion-proof structure is an integral whole, and the angles and dimensions (mainly referring to the thickness) of each structural member are designed considering the actual production needs. Therefore, the explosion-proof structure can be prepared by the injection molding process;

[0028] Injection molding can accurately control the weight of each product. The direct weight difference between independent products can be controlled within 1%. At the same time, the consistency of product dimensions is much higher than that of extrusion molding. In addition, the injection molding process has better adaptability to materials and can be applied to more types of resins for processing.

[0029] For the explosion-proof structural parts, when flame-retardant and antistatic modified resins are used for preparation through injection molding, the best comprehensive explosion-proof performance can be obtained, and the product stability / consistency is excellent. It is particularly preferred that when the modified resins of the utility model are used for preparation, the flame-retardant and explosion-proof performance is better.

[0030] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the following content, and some advantages can be obvious from the description or understood by implementing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the contents specifically pointed out in the text and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.

[0032] Figure 1 A schematic diagram of a three-dimensional structure of an embodiment of an explosion-proof structure (embodiment 1);

[0033] Figure 2 A top view of an embodiment of an explosion-proof structure (embodiment 1);

[0034] Figure 3 A front view of an embodiment of an explosion-proof structure (embodiment 1);

[0035] Figure 4 A cross-sectional view of an embodiment of an explosion-proof structure (embodiment 1);

[0036] Figure 5 The figure is a schematic diagram of the three-dimensional structure of an embodiment of an explosion-proof structure (embodiment 3).

[0037] Reference numerals:

[0038] 1. Outer tube body; 2. Support plate; 3. Inner tube body; 4. Connecting plate. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. The accompanying drawings form a part of this application and are used together with the embodiments of the present invention to explain the principles of the present invention, rather than to limit the scope of the present invention.

[0040] The present invention provides an explosion-proof structure, which includes an outer tube body 1, an inner tube body 3 coaxially arranged from outside to inside, and a support piece 2 connecting the outer surface of the inner tube body 3 and the inner surface of the outer tube body 1.

[0041] Both the outer tube body 1 and the inner tube body 3 are frustum cones, and the large and small end faces of the outer tube body 1 and the inner tube body 3 are arranged in opposite directions.

[0042] Preferably, the frustum cone is a circular frustum or a regular prism frustum.

[0043] Specifically, the outer tube body 1 and the inner tube body 3 have the same length and their end faces are flush.

[0044] Specifically, the support piece 2 connecting the outer surface of the inner tube body 3 and the inner surface of the outer tube body 1 is a trapezoidal support piece 2.

[0045] Furthermore, the side waist of the trapezoidal support piece 2 is connected to the generatrix and / or side edge of the outer tube body 1 and the inner tube body 3; the trapezoidal support piece 2 is arranged radially and is evenly distributed along the circumference.

[0046] The explosion-proof structure provided by the present invention forms stable and multiple small compartments with a certain blocking effect through the outer tube body 1, the inner tube body 3, and the support piece 2 (trapezoidal support piece 2). These small compartments can effectively contain the spread of flames and sharply attenuate the explosion pressure wave; at the same time, this material has a high surface efficiency per unit volume and good heat absorption properties, and can quickly absorb the heat released by combustion, reducing the temperature after the combustion reaction, shrinking the expansion degree of the reaction gas, and increasing the pressure value in the container not much, so that the combustion speed cannot reach the explosion limit speed, thus achieving the purpose of explosion prevention.

[0047] Among them, it is particularly worth emphasizing that the outer tube body 1 is a circular frustum or a regular prism frustum, and the inner tube body 3 is a circular frustum or a regular prism frustum; the outer tube body 1 and the inner tube body 3 have the same length and their end faces are flush, that is to say, the small end face of the outer tube body 1 is flush with the large end face of the inner tube body 3, and the large end face of the outer tube body 1 is flush with the small end face of the inner tube body 3; the outer tube body 1 and the inner tube body 3 are arranged in the opposite direction (see Figure 1 ). The above settings make the small compartments form a trapezoidal structure in the axial section. The small compartments with a trapezoidal structure have greatly improved structural strength and stability compared with the small compartments with the same width up and down in the prior art, can withstand stronger explosion shock waves, and have a more excellent explosion-proof effect.

[0048] Secondly, since the outer tube body 1 is designed in a frustum of a cone or a regular frustum, it is more stable in the container under normal assembly conditions and is not prone to shaking and collision, which not only extends the service life of the explosion-proof structural member but also protects the inner wall of the container.

[0049] A circular or polygonal connecting piece 4 is provided on the small end face of the inner tube body 3. The explosion-proof structure also adds a circular or polygonal connecting piece 4 on the small end face of the inner tube body 3. On the one hand, the connecting piece 4 can further improve the overall strength of the structural member, and on the other hand, it also provides an axial partition, which is beneficial to improving the explosion-proof performance.

[0050] In addition, the connecting piece 4 can be used as an injection port for the injection molding process, so that the structural member can meet the requirements of the injection molding process. When the above structural member is prepared by using a modified resin and the injection molding process, the entire structural member can have excellent flame-retardant and explosion-proof properties and a smoother surface, and the product stability is greatly improved.

[0051] Preferably, through holes are formed in the connecting piece 4, and the through holes are set in accordance with the specific injection molding process requirements (injection port design) and the shape of the inner tube body 3; the through holes help to reduce the influence of the structural member on the fluid flow in the container and are beneficial to reducing the volume and weight of the explosion-proof structure.

[0052] Specifically, when both the outer tube body 1 and the inner tube body 3 are regular frustums, the number of sides of the two is equal, and the connecting lines of the corresponding frustum vertices are located on the same diameter line. When both the outer tube body 1 and the inner tube body 3 are regular frustums, in order to ensure the uniformity of the entire structural member and achieve isotropy as much as possible, the number of sides of the outer tube body 1 and the inner tube body 3 should be equal and the connecting lines of the corresponding frustum vertices should be located on the same diameter line; the above setting method helps to improve the overall stability of the structure. It should be noted that the structural strength and uniformity of a regular frustum with an even number of sides are better than those of a regular frustum with an odd number of sides.

[0053] Preferably, the regular frustum is a regular frustum with 2, 4, 6, 8, 10, or 12 sides, and particularly preferably a regular frustum with 6 or 8 sides; mainly to ensure excellent explosion-proof performance without significantly increasing the weight of a single structure.

[0054] Similarly, when one of the outer tube body 1 or the inner tube body 3 is a regular frustum (that is, only one of the two is a regular frustum structure and the other is a frustum of a cone structure), a regular frustum structure with an even number of sides is still preferred, and particularly preferably a regular frustum with 6 or 8 sides.

[0055] Furthermore, a weight reduction notch is provided on the non-connecting side of the trapezoidal support piece 2.

[0056] Optionally, weight-reducing notches are provided on the upper edge and / or lower edge of the trapezoidal support piece 2. The provision of the weight-reducing notches can increase the internal void space of the explosion-proof structure, improve the explosion-proof effect, and at the same time help reduce the volume and weight of the entire explosion-proof structural member, further saving costs. In principle, the total area ratio of the weight-reducing notches does not exceed 10% of the area of the trapezoidal support piece 2; otherwise, it may affect the overall structural strength and explosion-proof performance.

[0057] Specifically, the explosion-proof structure is divided into multiple identical divided areas by the trapezoidal support piece 2, and through holes are provided in the corresponding outer pipe body 1 and inner pipe body 3 of each divided area. The provision of the above through holes enables the entire structural member to be radially connected and blocked / divided in the circumferential direction by the trapezoidal support piece 2; the radial connection is to prevent the explosion-proof structure from affecting the flow rate of the fluid medium / fuel and thus affecting the refueling or unloading speed; the circumferential division is to ensure the explosion-proof effect of the explosion-proof structure, which has a blocking and partitioning effect on combustion waves and shock waves.

[0058] Preferably, the area ratio of the through holes is 60-80%, such as 60%, 65%, 70%, 75%, 80%. If it is too large, it will affect the structural strength of the entire structure; if it is too small, it will affect the fuel flow efficiency and explosion-proof effect, and will also increase the weight of a single structure, thereby increasing the weight per unit volume of the product. The number of through holes in a single divided area ≥ 1, and the shape of the through holes is circular, oval, triangular, trapezoidal, square, rectangular or other polygons.

[0059] Particularly preferably, the area ratios of the through holes in the outer pipe body 1 and the inner pipe body 3 are both 75% and the number of through holes in a single divided area is 1, that is, there is 1 through hole in the outer pipe body 1 and 1 through hole in the inner pipe body 3.

[0060] Optionally, the inner pipe body 3 is a multi-layer structure. The shapes of the layers of the multi-layer structure match and are coaxial with each other. The large-diameter sides and small-diameter sides of two adjacent inner pipe bodies 3 are arranged at the same end. The trapezoidal support piece 2 extends radially inward and is connected to each layer structure of the inner pipe body 3, so that the multi-layer inner pipe body 3 and the outer pipe body 1 form an integral body.

[0061] It should be noted that when there is a regular frustum-shaped structure in the multi-layer structure of the inner pipe body 3 and there are more than 2 regular frustum-shaped structures in the explosion-proof structure (such as several layers in the outer pipe body 1 + inner pipe body 3; or several layers in the inner pipe body 3); the number of side edges of each regular frustum should be equal to ensure that the trapezoidal support piece 2 can be radially connected to the edges of each side.

[0062] It should be emphasized that when the inner pipe body 3 is a multi-layer structure, through holes are provided at the corresponding positions of each layer structure in each divided area.

[0063] Specifically, the multi-layer structure has 2 to 3 layers, preferably 2 layers. Too many layers do not significantly improve the structural strength and flame retardancy and explosion protection performance, and will significantly increase the weight and volume of the explosion-proof structural member.

[0064] Specifically, the angle between the generatrix or side edge of the outer tube body 1 and the inner tube body 3 and the axis is 0.5 to 30°, such as 0.5°, 1°, 2°, 5°, 10°, 15°, 20°, 25°, 30°. The outer tube body 1 and the inner tube body 3 with the above shapes help to improve the structural strength of the structural member, especially the structural strength of the internal small compartments, and are beneficial to the flow and filling of the modified resin in the injection molding process;

[0065] The slopes of the inner and outer tube bodies 1 can be the same or different, but the inner side of the small-diameter end face of the outer tube body 1 is not connected to the outer side of the large-diameter end face of the inner tube body 3, that is, the inner diameter of the small-diameter end face of the outer tube body 1 is greater than the outer diameter of the large-diameter end face of the inner tube body 3.

[0066] Particularly preferably, the slopes of the inner and outer tube bodies 1 are the same, which is more conducive to processing and forming, making the forming die have a higher symmetry, and both the service life and stability are higher.

[0067] Specifically, the thickness of each component of the explosion-proof structure is the same, which is 0.1 to 2.0 mm, such as 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0 mm. If the thickness is too thin, it is not conducive to forming (especially in the injection molding process), and the structural strength of the product is low. If the thickness is too thick, the weight of the product per unit volume is too large. Preferably, it is 0.4 mm.

[0068] Specifically, the inner diameter of the large end face of the outer tube body 1 is 20 to 500 mm, such as 20, 30, 33, 50, 80, 100, 200, 300, 400, 500 mm. This range is suitable for the installation port sizes of containers such as small fuel tanks, pipelines, and large oil tanks; the height is 3 to 300 mm, such as 3, 10, 20, 30, 50, 80, 100, 200, 300 mm. The height comprehensively considers the installation port size of the container and the convenience of installation.

[0069] Preferably, the large end of the outer tube body 1 is preferably 33 mm, and the height is 30 mm. This size is determined according to the size of the fuel filling port of the portable oil drum on the market, which is convenient for installation and takes into account the explosion-proof effect.

[0070] Specifically, the size of the inner tube body 3 is determined according to the size of the outer tube body 1, as long as the inner diameter of the small-diameter end face of the outer tube body 1 is greater than the outer diameter of the large-diameter end face of the inner tube body 3; the height of the inner tube body 3 is the same as the height of the outer tube body 1.

[0071] Specifically, the explosion-proof structure is made by injection molding. Injection molding can accurately control the weight of each product. The direct weight difference between independent products can be controlled within 1%, and the consistency of the product's external dimensions is much higher than that of extrusion molding. Moreover, injection molding has better adaptability to materials and can be applied to more types of resins for processing.

[0072] For the explosion-proof structural part, when a flame-retardant and antistatic modified resin is used to prepare it by injection molding, the best comprehensive explosion-proof performance can be obtained, and the product stability / consistency is excellent.

[0073] Specifically, the explosion-proof structure is made of an antistatic and flame-retardant modified resin.

[0074] Specifically, the modified resin contains a matrix resin, a flame-retardant filler, a conductive filler, and an additive. The content of each component is calculated by mass: 4 - 8 parts of the matrix resin, 1 - 3 parts of the flame-retardant filler, 0.5 - 2 parts of the conductive filler, and 0.5 - 1 part of the additive.

[0075] The functions and content determination basis of each component are as follows:

[0076] Matrix resin: The matrix resin is the main material for preparing the explosion-proof structure, and its performance is directly related to the compatibility with the contact medium and the structural strength of the product. Adding too much or too little of the matrix resin will affect the realization of the flame-retardant and conductive functions of the modified material. Adding too much (i.e., too little of other components), the modified function cannot be realized; adding too little, the product performance improvement is not obvious and the product cost increases significantly (the cost of other components is relatively high).

[0077] Conductive filler: To improve the electrical conductivity of the modified resin. Since the matrix resin is usually an insulating material, and the contact medium in the application scenario, such as hydrocarbon fuel, is a saturated aliphatic hydrocarbon, and static electricity accumulation is likely to occur due to intermolecular friction. Therefore, the explosion-proof filler should have the ability to conduct electricity or static electricity to prevent the accumulation of static charges from triggering static discharge phenomena and improve the safety of the contact medium itself. Adding too much of the conductive filler will increase the product cost and affect the forming ability of the modified material, resulting in a decrease in fluidity and a decrease in the melt index, making the product unable to be formed; adding too little will not achieve the required electrical conductivity.

[0078] Flame-retardant filler: To improve the flame-retardant performance of the modified resin. Since the matrix resin is usually a non-flame-retardant material, and the contact medium in the application scenario is mostly flammable and explosive hydrocarbon fuels and liquid hazardous chemicals (such as alcohols, ketones, ethers, aromatic hydrocarbons, etc.), which are prone to catch fire and burn. Therefore, it is necessary to ensure that the explosion-proof structure itself does not burn to avoid the combustion or explosion of the contact medium caused by the combustion of the explosion-proof structure itself. Adding too much of the flame-retardant filler will increase the product cost and affect the forming ability of the modified material, resulting in a decrease in fluidity and a decrease in the melt index, making the product unable to be formed; adding too little will not achieve the required flame-retardant performance.

[0079] Additives: The additives are lubricants and / or demolding agents. The lubricant plays a role in lubricating the matrix resin, enhancing the crystallization ability of the matrix resin molecules during the processing, and maximizing the retention of its bulk properties. The function of the demolding agent is that since the explosion-proof structure of the present utility model is a thin-wall injection molding, an injection mold is required during the molding process, and the product demolding process is relatively difficult. Therefore, by adding a demolding agent to the matrix resin, the demolding ability of the product is improved, the demolding effect is enhanced, which helps to stabilize production and improve the finished product rate. Appropriate addition helps to improve the product performance, while excessive addition will lead to a decrease in product performance.

[0080] Synergistic effect: The above components are added according to the product performance requirements, and both use a flame-retardant filler system and a conductive filler system that conform to the matrix resin system, ensuring that the explosion-proof structure has excellent flame-retardant properties, low volume resistivity and good fluidity, and is suitable for the injection molding process.

[0081] Specifically, the matrix resin is one or more of resins such as polyethylene, polypropylene, polyvinyl chloride, polyamide, polycarbonate, polyester, polyphenylene sulfide, and polystyrene; the above resins are all thermoplastic resins, all of which can be processed by the injection molding process, and can all achieve functional requirements through flame-retardant and conductive modification.

[0082] Since the explosion-proof structure is an explosion-proof safety product for hazardous chemicals, there are a very large number of flammable and explosive hazardous chemicals, and for different types of hazardous chemicals, such as alcohols, resins with low polarity such as polyethylene or polypropylene are required as the matrix material, so that the matrix resin and alcohol-based hazardous chemicals have good compatibility; for hydrocarbon fuels such as gasoline and diesel, resins with high polarity are required as the matrix resin, such as polyamide and polyphenylene sulfide.

[0083] The conductive filler is one or more of carbon fiber, carbon nanotube, graphite, graphene, and carbon black;

[0084] The flame-retardant filler is one of a phosphorus-based flame retardant, a nitrogen-based flame retardant, or a nitrogen-phosphorus synergistic flame retardant. The common types of the above flame retardants can all meet the implementation needs. Exemplarily, the flame-retardant filler is triphenyl phosphate or melamine phosphate.

[0085] The additive is a lubricant and / or an internal demolding agent, mainly to increase the demolding ability of the matrix resin during the modification process, reduce the risk of non-demolding, and improve the product qualification rate. Common commercially available products can all meet the implementation needs. Exemplarily, the additive is pentaerythritol stearate or calcium stearate.

[0086] Specifically, the volume resistivity of the modified resin does not exceed 1.0×10 10Ω·cm, the combustion rating is not lower than UL94V-1 level, and the melt index is not lower than 10 g / 10 min. The barrier explosion-proof structure is used in hydrocarbon fuels and hazardous chemicals. During transportation, use, transfer, and storage, these materials often generate static electricity due to friction between their own molecules (such as fuels being hydrocarbons, non-polar materials), electric shock, etc., resulting in charge concentration and discharge, causing combustion and explosion accidents. Therefore, it is required that the barrier explosion-proof material has anti-static ability. In relevant product standards, such as GJB 8455 "General Technical Specification for Barrier Explosion-Proof Materials for Filling Fuel Tanks and Oil Tanks", it is required that the volume resistivity of this type of material does not exceed 1.0×1010 Ω·cm.

[0087] It should be noted that because this product uses an injection molding process, too low a melt index means that the modified resin material has worse fluidity in the high-temperature molten state, making thin-wall injection molding more difficult, or even impossible to mold, affecting the molding quality and efficiency of the product.

[0088] Specifically, the volume resistivity of the explosion-proof structural member provided by the present invention is ≤6.3×10 8 Ω·cm, the debris amount in the vibration test is ≤1.0 mg / L, the flame retardancy is not lower than V-0 level, the compressive strength is not lower than 15 MPa, the melt index is not lower than 47 g / 10 min, and no secondary explosion occurs in the explosion-proof test.

[0089] Example 1

[0090] This example provides a tubular multi-channel barrier explosion-proof structure (as Figure 1 shown). The explosion-proof structure includes an outer tube body and an inner tube body coaxially arranged from outside to inside. The outer tube body is frustum-shaped, and the inner tube body is frustum-shaped;

[0091] The small end face of the outer tube body is flush with the large end face of the inner tube body, and the large end face of the outer tube body is flush with the small end face of the inner tube body;

[0092] The inner surface of the outer tube body and the outer surface of the inner tube body are connected by trapezoidal support pieces. The trapezoidal support pieces are arranged radially along the explosion-proof structural member and are evenly distributed in a circle; the trapezoidal support pieces are connected to the generatrices of the outer tube body and the inner tube body; there are a total of 8 trapezoidal support pieces;

[0093] A circular connecting piece is provided at the small end face of the inner tube body. The connecting piece is provided with 8 trapezoidal through holes (chamfered) evenly distributed in a circle and corresponding to the divided areas / small compartments. The area ratio of the through holes is 60% of the area of the connecting piece;

[0094] Trapezoidal weight-reducing notches are provided on the upper and lower edges of the trapezoidal support pieces. The area of a single notch accounts for 5% of the total area of the trapezoidal support piece;

[0095] The explosion-proof structure is divided into 8 completely identical divided areas by the trapezoidal support piece, and through holes are provided in the corresponding outer tube body and inner tube body of each divided area;

[0096] The area ratio of the through holes is 75%, the number of the through holes is 1, and the shape of the through holes is trapezoidal (with chamfering treatment);

[0097] The thickness of each component of the explosion-proof structure is 0.4 mm;

[0098] The inner diameter of the large end face of the outer tube body is 33 mm, the inner diameter of the small end face is 30 mm, and the height is 30 mm; the inner diameter of the large end face of the inner tube body is 18 mm, the inner diameter of the small end face is 15 mm, and the height is 30 mm.

[0099] The explosion-proof structure is made of a modified resin. The composition of the modified resin is as follows by mass fraction: the matrix resin is polycarbonate, the flame retardant filler is triphenyl phosphate, the conductive filler is carbon nanotubes, and the additive is pentaerythritol stearate. The content of each component is respectively 70%: 15%: 8%: 7% by mass percentage.

[0100] The explosion-proof structure of this embodiment is obtained by an injection molding process.

[0101] Example 2

[0102] The difference between this embodiment and Example 1 is that the explosion-proof structure is made of a different modified resin. The composition of the modified resin is as follows by mass fraction: the matrix resin is polypropylene, the flame retardant is melamine phosphate, the conductive filler is carbon fiber, and the additive is calcium stearate. The content of each component is respectively 60%: 20%: 14%: 6% by mass percentage.

[0103] Example 3

[0104] The difference between this embodiment and Example 1 is that the product structure is a three-layer tube body design. The outer tube body is a single-layer frustum-shaped structure, and the inner tube body is a two-layer frustum-shaped structure. (As Figure 5 shown)

[0105] Among them, the inner diameter of the large end face of the outer tube body is 38 mm, the inner diameter of the small end face is 34 mm, and the height is 34 mm; the inner diameter of the large end face of the middle tube body is 27 mm, the inner diameter of the small end face is 23 mm, and the height is 34 mm; the inner diameter of the large end face of the inner tube body is 17 mm, the inner diameter of the small end face is 15 mm, and the height is 34 mm.

[0106] According to JT / T 1046 "Technical requirements for barrier explosion-proof safety of road transport vehicle fuel tanks and liquid fuel transport tanks", GJB8455 "General technical specifications for barrier explosion-proof materials for fuel tank filling" and AQT 3001 "Technical requirements for barrier explosion-proof of fuel (gas) storage tanks at gas stations", all three standards stipulate that the volume resistivity of barrier explosion-proof materials shall not exceed 1.0×10 10 Ω.cm, the flame retardant level is not less than V-1, the debris volume after vibration test is not more than 1.3mg / L and 1.0mg / L respectively, and the filling density is not more than 80kg / m 3 , no secondary explosion occurs in the static explosion test. Table 1 shows the relevant test results of Examples 1-3 of the utility model, and the test results meet the requirements of relevant standards.

[0107] Table 1 Performance test results of Examples 1-3

[0108]

[0109] The volume resistivity of the explosion-proof structural member provided by the utility model is ≤6.3×10 8 Ω·cm, vibration test debris ≤1.0mg / L, flame retardant performance not less than V-0 level, filling density ≤76kg / m 3 , the compression strength is not less than 15MPa, the melt index is not less than 47g / 10min, and no secondary explosion occurs during the explosion-proof test.

[0110] It is worth noting that the inner tube body of the multi-layer structure in Example 3 sacrifices the filling density performance, but helps to improve the strength and stability of the overall structure, and because more "small compartments" are cut out, the flame retardant and explosion-proof performance is further improved; since the test conditions of the static explosion test and the flame retardant level are defined by the relevant standards, it is impossible to intuitively display the advantages of the multi-layer structure. The test results are all no secondary explosion and flame retardant level V-0 (the highest level), hereby explained.

[0111] In fact, according to the above test results, it can be seen that the relevant performance of the structure in Example 1 can fully meet the needs of explosion-proof and flame-retardant, and the indicators such as filling density, flame retardant performance and compression strength have been significantly improved compared with the existing explosion-proof structure.

[0112] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. An explosion-proof structure, characterized in that, The explosion-proof structure includes an outer tube body (1), an inner tube body (3) which are coaxially arranged from outside to inside, and support pieces (2) connecting the outer surface of the inner tube body (3) and the inner surface of the outer tube body (1); Both the outer tube body (1) and the inner tube body (3) are frustum cones, and the large and small end faces of the outer tube body (1) and the inner tube body (3) are arranged oppositely.

2. The explosion-proof structure according to claim 1, wherein, The frustum cone is a circular frustum or a regular pyramid frustum.

3. The explosion-proof structure according to claim 2, wherein The regular pyramid frustum is a regular pyramid frustum with 2, 4, 6, 8, 10, or 12 sides.

4. The explosion-proof structure according to claim 1, characterized in that, The outer tube body (1) and the inner tube body (3) have the same length and their end faces are flush.

5. The explosion-proof structure according to claim 1, characterized in that, The support pieces (2) connecting the outer surface of the inner tube body (3) and the inner surface of the outer tube body (1) are trapezoidal support pieces (2).

6. The explosion-proof structure according to claim 5, characterized in that, The side waists of the trapezoidal support pieces (2) are connected to the generatrices and / or side edges of the outer tube body (1) and the inner tube body (3); the trapezoidal support pieces (2) are arranged radially and are evenly distributed along the circumference.

7. The explosion-proof structure according to claim 6, wherein The non-connecting edges of the trapezoidal support pieces (2) are provided with weight-reducing notches.

8. The explosion-proof structure according to claim 1, characterized in that, The explosion-proof structure is divided into a plurality of identical divided areas by the support pieces (2), and through holes are provided in the outer tube body (1) and the inner tube body (3) corresponding to each divided area.

9. The explosion-proof structure according to claim 1, characterized in that, The inner tube body (3) is a multi-layer structure.

10. The explosion-proof structure according to claim 1, wherein, The angle between the generatrix or side edge of the outer tube body (1) and the inner tube body (3) and the axis is 0.5 to 30°.

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