A gas cylinder thermal protection device

Abstract

This invention relates to the field of protective device technology, specifically to a gas cylinder thermal protection device, comprising: a thermal protection section, including a vertical frame with a detachable base, and an L-shaped bracket detachably mounted on the upper part of the vertical frame, wherein a thermal protection cover aligned with the base is fixedly mounted on the L-shaped bracket; a filling cavity for inserting the gas cylinder body is provided at the axis of the thermal protection cover; this gas cylinder thermal protection device, through the provided thermal protection section, can form a protective structure outside the gas cylinder, wherein the concentric inner and outer cavities, together with the filling material, can achieve the effects of independent protection and mixed protection, reducing the invasion of heat sources into the internal gas cylinder by physically isolating heat transfer and chemically decomposing heat absorption, thus greatly improving the thermal protection performance of the gas cylinder and reducing the probability of gas cylinder explosion caused by external fire sources or high temperatures.

Description

Technical Field

[0001] This invention relates to the field of protective device technology, and specifically to a gas cylinder thermal protection device. Background Technology

[0002] Gas cylinders are widely used in many fields, such as industrial production, as common containers for storing and transporting various gases. However, because the gases stored inside gas cylinders are usually under high pressure and some gases have dangerous characteristics such as flammability and explosiveness, once the cylinder overheats, it is very easy to cause explosions and fires, causing huge losses to people's lives and property.

[0003] Currently, existing gas cylinders on the market have several shortcomings in terms of thermal protection. Most have protective covers and heat insulation panels on the outside of the cylinder, which can mitigate the effects of small-scale high-temperature environments to a certain extent. However, for localized fires and the initial stages of ignition, the heat insulation panels have limited thermal protection effectiveness. They only form a simple heat insulation layer on the outside of the cylinder and are insufficient to effectively prevent most of the heat from being transferred to the inside of the cylinder in a high-temperature environment, thus posing a risk of explosion. As a result, gas cylinders are considered high-risk targets at fire scenes. Therefore, considering how to improve the thermal protection performance of gas cylinders to a greater extent and reduce the risk of gas cylinder explosions caused by external fire sources or high temperatures, we propose a gas cylinder thermal protection device. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings mentioned in the background art and provide a gas cylinder thermal protection device.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A gas cylinder thermal protection device, comprising: The heat protection unit includes a vertical frame with a base detachably mounted on the bottom, and an L-shaped bracket detachably mounted on the upper part of the vertical frame, wherein a heat protection cover aligned with the base is fixedly mounted on the L-shaped bracket; The heat shield has a cavity at its axis for inserting the gas cylinder body.

[0006] Preferably, an annular partition mesh is fixedly installed inside the thermal protection cover, and an inner cavity and an outer cavity are respectively provided on the inner and outer sides of the annular partition mesh.

[0007] Preferably, the annular partition mesh plate is provided with through holes for connecting the inner cavity and the outer cavity.

[0008] Preferably, the inner cavity is filled with paraffin blocks.

[0009] Preferably, the outer cavity is filled with aluminum hydroxide particles with a particle size larger than that of the through hole.

[0010] Preferably, the outer cavity is filled with a mixture of expanded vermiculite particles and aluminum hydroxide particles, accounting for 10-30% of the cavity volume.

[0011] Preferably, an expanded graphite layer is sprayed onto the inner wall of the cavity on the side closest to the container cavity.

[0012] Preferably, the height of the inner cavity is higher than that of the outer cavity.

[0013] Preferably, the base is provided with a groove for holding the gas cylinder body, and the L-shaped bracket is provided with a slot for adjusting the installation height of the heat protection part.

[0014] Preferably, the gas cylinder thermal protection device further includes: Two vertical support frames are fixedly connected by a horizontal frame; A top plate, fixedly installed on top of the two vertical support frames, is used to shield the heat protection section; The vertical frame can be detachably installed on the horizontal frame; A fire sprinkler pipe is installed below the top slab.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This gas cylinder thermal protection device forms a protective structure on the outside of the gas cylinder through its thermal protection section. The concentric inner and outer cavities, along with the filling material, can achieve both independent and mixed protection. By physically isolating heat transfer and chemically decomposing heat absorption, it reduces the invasion of heat sources into the gas cylinder, greatly improving the gas cylinder's thermal protection performance and reducing the probability of gas cylinder explosion caused by external fire sources or high temperatures. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the overall structure installation according to an embodiment of the present invention; Figure 2 This is a schematic diagram showing the installation of the thermal protection part and the gas cylinder body of the present invention; Figure 3 This is an exploded view of the thermal protection section and the gas cylinder body of the present invention. Figure 4 This is a cross-sectional schematic diagram of the heat shield of the present invention; Figure 5 This is a schematic cross-sectional view of the thermal protection shield of the present invention.

[0017] The meanings of the labels in the diagram are as follows: 1. Vertical support frame; 2. Horizontal frame; 3. Top plate; 4. Vertical frame; 5. Bottom support; 51. Support groove; 6. L-shaped card holder; 61. Slot; 7. Thermal protective cover; 71. Annular partition mesh plate; 711. Through hole; 701. Container cavity; 702. Inner cavity; 703. Outer cavity; 8. Gas cylinder body. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-5 The present invention will describe the above technical solution in detail through the following embodiments: The gas cylinder thermal protection device in this example includes two vertical support frames 1 fixedly connected by a horizontal frame 2. A top plate 3 is fixedly installed on the top of the two vertical support frames 1. In order to provide local fire extinguishing and cooling functions in the event of a fire, a fire sprinkler pipe is installed below the top plate 3 to provide fire sprinkler function.

[0020] It also includes: a thermal protection unit, including a vertical frame 4 that is detachably mounted on the horizontal frame 2, such as... Figures 1-3 The structure shown has a base support 5 and an L-shaped bracket 6 that are detachably installed at the bottom and top of the vertical frame 4 respectively via screws. The base support 5 has a groove 51 for holding the gas cylinder body 8. To accommodate gas cylinder bodies 8 of different heights, this embodiment has a slot 61 on the L-shaped bracket 6 for adjusting the installation height of the heat protection part. Figure 4 As shown.

[0021] Specifically, in order to form a thermal protection structure on the outside of the gas cylinder body 8, this embodiment has a thermal protection cover 7 fixedly installed on the L-shaped bracket 6, aligned with the position of the base 5; such as Figure 4 and Figure 5 As shown in the structure, the heat shield 7 has a cavity 701 at its axis for inserting the gas cylinder body 8, and creatively uses an annular partition mesh 71 to divide the internal cavity of the shield into an inner cavity 702 and an outer cavity 703.

[0022] It should be explained that, in order to obtain the conductive structure, the annular partition mesh plate 71 is provided with through holes 711 for connecting the inner cavity 702 and the outer cavity 703; in this embodiment, the inner cavity 702 is filled with solidified paraffin blocks, and in order to better allow the paraffin to flow into the outer cavity 703 when melting, in this embodiment, an expanded graphite layer is sprayed onto the inner wall of the inner cavity 702 on the side near the container cavity 701, and simultaneously... Figure 2 As shown, the inner cavity 702 is higher than the outer cavity 703, meaning that the expanding graphite layer will effectively squeeze the molten paraffin into the outer cavity 703.

[0023] In this embodiment, the outer cavity 703 is filled with aluminum hydroxide particles with a particle size larger than that of the through hole 711, and is also mixed with expanded vermiculite particles accounting for 20% of the cavity volume. Paraffin wax is squeezed into the outer cavity 703 and then mixed with the filling particles.

[0024] It should be noted that the thermal protection part of this application can provide continuous protection during the high-temperature process of a fire. In the early stage of a fire at 50-150℃: paraffin wax melts first, and after melting, it comes into contact with aluminum hydroxide and expanded vermiculite particles and mixes to form a mixture coated with a paraffin wax layer. The thermal conductivity of the melted paraffin wax is about 0.2-0.3 W / (m·K), which is an inefficient heat conductor. As the temperature continues to rise, in the mixed system, paraffin wax continues to absorb heat through phase change and heat conduction, while aluminum hydroxide begins to decompose and release water. The two form a composite heat insulation layer of "liquid encapsulation and chemical decomposition", which realizes the function of simultaneously blocking heat transfer.

[0025] Specifically, the fire protection mechanism is as follows: In the initial stage of a fire, when the ambient temperature rises above 60°C, paraffin wax begins to melt, undergoing a phase change and absorbing heat. It mixes with the particles, and the paraffin wax encapsulates aluminum hydroxide and expanded vermiculite particles, forming a "liquid-solid" composite system. As the temperature continues to rise above 200°C, the aluminum hydroxide particles encapsulated in the paraffin wax begin to decompose: 2Al(OH)3 → Al2O3 + 3H2O, absorbing a large amount of heat. Simultaneously, the released water vapor forms a "gas-liquid" thermal barrier within the paraffin wax layer, further preventing heat transfer to the tank. The thermal conductivity of water vapor is only about 0.025. W / (m·K) is about 1 / 10 of that of paraffin. When water vapor forms bubbles in paraffin, the originally continuous liquid paraffin is divided into "discontinuous liquid films" by the bubbles. When heat is transferred from the high-temperature side to the inner tank side, it must pass through the interface of "liquid film → bubble → liquid film" multiple times. Since the thermal conductivity of gas is extremely low, each time it passes through the gas-liquid interface, the heat transfer efficiency will be significantly reduced, which is equivalent to adding multiple "low thermal conductivity barriers" in the heat conduction path.

[0026] To ensure thorough mixing, the inner cavity 702 is coated with expanded graphite, which expands continuously above 80°C, compressing and mixing with the molten paraffin. Even if spilled during a fire, mixing is guaranteed. It should be explained that while expanded vermiculite particles have a porous structure, even when encapsulated by liquid paraffin, the internal micropores and interparticle gaps are not completely filled. This is because paraffin has high viscosity, making it difficult to penetrate deep into the micropores of expanded vermiculite. Furthermore, expanded vermiculite has low affinity; its surface is polar while paraffin is non-polar. Therefore, paraffin can only adhere to the surface of the expanded vermiculite and aluminum hydroxide particles, failing to fully penetrate the micropores or all interparticle gaps, thus preserving most of the channel space. This channel space provides passage for water vapor, preventing steam accumulation that could lead to excessive pressure and structural damage. Simultaneously, it avoids excessive pressure affecting the decomposition and endothermic reaction of aluminum hydroxide particles, allowing the phase change endothermic reaction of paraffin and the decomposition endothermic reaction of aluminum hydroxide to proceed synergistically and efficiently, ultimately improving the fire safety of the gas cylinder.

[0027] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0028] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A gas cylinder thermal protection device, characterized in that: include: The heat protection unit includes a vertical frame (4) with a base support (5) detachably mounted on the bottom, and an L-shaped bracket (6) detachably mounted on the upper part of the vertical frame (4), on which a heat protection cover (7) aligned with the position of the base support (5) is fixedly mounted. The heat shield (7) has a filling cavity (701) at its axis for inserting the gas cylinder body (8).

2. The gas cylinder thermal protection device as described in claim 1, characterized in that: The heat shield (7) has an annular partition mesh plate (71) fixedly installed inside, and an inner cavity (702) and an outer cavity (703) are respectively provided on the inner and outer sides of the annular partition mesh plate (71).

3. The gas cylinder thermal protection device as described in claim 2, characterized in that: The annular partition mesh plate (71) has through holes (711) for connecting the inner cavity (702) and the outer cavity (703) on the inside and outside.

4. The gas cylinder thermal protection device as described in claim 3, characterized in that: The inner cavity (702) is filled with paraffin blocks.

5. The gas cylinder thermal protection device as described in claim 3, characterized in that: The outer cavity (703) is filled with aluminum hydroxide particles with a particle size larger than that of the through hole (711).

6. The gas cylinder thermal protection device as described in claim 5, characterized in that: The outer cavity (703) is filled with a mixture of expanded vermiculite particles and aluminum hydroxide particles, accounting for 10-30% of the cavity volume.

7. The gas cylinder thermal protection device as described in claim 4, characterized in that: An expanded graphite layer is sprayed onto the inner wall of the inner cavity (702) on the side near the container cavity (701).

8. The gas cylinder thermal protection device as described in claim 7, characterized in that: The height of the inner cavity (702) is higher than that of the outer cavity (703).

9. The gas cylinder thermal protection device as described in claim 1, characterized in that: The base (5) is provided with a slot (51) for holding the gas cylinder body (8), and the L-shaped bracket (6) is provided with a slot (61) for adjusting the installation height of the heat protection part.

10. The gas cylinder thermal protection device as described in claim 1, characterized in that: Also includes: Two vertical support frames (1) are fixedly connected by a horizontal frame (2); The top plate (3) is fixedly installed on the top of the two vertical support frames (1) to shield the heat protection part; The vertical frame (4) can be detachably installed on the horizontal frame (2); A fire sprinkler pipe is installed below the top plate (3).

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