Anti-explosion dry powder fire extinguisher

Abstract

The utility model provides an anti-explosion dry powder fire extinguisher and belongs to the field of fire extinguishers. The explosion-proof dry powder fire extinguisher comprises a bottle body, a head and a spray pipe, the head is connected to the top of the bottle body, the top of the bottle body is provided with a bottle opening, the inner end of the spray pipe extends into the bottle body from the bottle opening, the explosion-proof dry powder fire extinguisher further comprises an outer bottle body, the bottle body is located in the outer bottle body and connected with the outer bottle body, and an annular spacing gap layer is arranged between the outer wall of the bottle body and the inner wall of the outer bottle body. According to the explosion-proof dry powder extinguisher, the explosion-proof performance is optimized, and the explosion occurrence probability is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of fire extinguishers, and relates to explosion-proof dry powder fire extinguishers. Background Technology

[0002] Dry powder fire extinguishers are a type of fire extinguisher that uses ammonium phosphate dry powder extinguishing agent to extinguish fires. They are commonly used for general fires and can also extinguish fires caused by oil, gas, etc. The internal pressure of a dry powder fire extinguisher is generally between 1.2-1.5 MPa, while that of a water-based fire extinguisher is around 2.5 MPa, and that of a carbon dioxide fire extinguisher is generally between 5-6 MPa. It is generally agreed that carbon dioxide fire extinguishers have the highest internal pressure, therefore requiring the highest explosion-proof performance. Their cylinders are usually made as a one-piece structure to ensure greater strength. In practice, the explosion-proof performance of dry powder fire extinguishers is often overlooked, so the cylinders are often made as separate structures with welded top and bottom. However, recent fire extinguisher safety accidents have shown that a significant proportion of accidents involving dry powder fire extinguishers are caused by the clumping and pressurization of the powdered extinguishing agent and high-temperature pressurization, which cause the cylinder to burst due to the increased internal pressure.

[0003] To address the aforementioned issues, it is necessary to innovate and improve current dry powder fire extinguishers. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by providing an explosion-proof dry powder fire extinguisher. This explosion-proof dry powder fire extinguisher optimizes explosion-proof performance, reduces the probability of explosion, and solves the problems of insufficient explosion-proof performance of existing dry powder fire extinguishers.

[0005] The purpose of this utility model can be achieved through the following technical solution: an explosion-proof dry powder fire extinguisher, comprising a bottle body, a head, and a nozzle, wherein the head is connected to the top of the bottle body, the top of the bottle body has a bottle opening, and the inner end of the nozzle extends into the bottle body from the bottle opening. The feature is that it further comprises an outer bottle body, wherein the bottle body is located inside the outer bottle body and the two are connected, and there is a circular space gap layer between the outer wall of the bottle body and the inner wall of the outer bottle body.

[0006] The cylinder, nozzle, and spray nozzle of this dry powder fire extinguisher are all based on existing technology; specific details and connection structures will not be elaborated upon. This dry powder fire extinguisher features an outer cylinder structure that encloses the main cylinder. The outer cylinder and the main cylinder are designed with a non-contact gap layer, which, combined with the enclosing design, significantly enhances the explosion-proof function. Specifically, the outer cylinder provides direct protection by enclosing the main cylinder, preventing corrosion and reducing the impact force of external forces. Internally, in the event of an explosion, the outer cylinder design reduces the explosive force, minimizing damage. Even if the main cylinder has not exploded but shows a tendency to explode, the outer cylinder acts as a second barrier, preventing an explosion as much as possible, providing double protection. Secondly, the gap layer also serves multiple purposes. The gap prevents ordinary external impacts from reaching the main cylinder, directly avoiding deformation. It also reduces heat conduction, minimizing pressure changes caused by high temperatures affecting the medium inside the cylinder.

[0007] In the aforementioned explosion-proof dry powder fire extinguisher, the outer bottle body includes an inner connecting shell and an outer cover shell. The inner connecting shell is located at the bottom of the bottle body and is cylindrical with its inner end connected to the bottom of the bottle body. The outer end of the inner connecting shell bends and extends from the outside towards the top of the bottle body to form the cylindrical outer cover shell. The top of the outer cover shell is connected to the top of the bottle body, and the outer cover shell and the bottle body form the space gap layer.

[0008] The inner connecting shell and the outer cover shell can be a single integrated structure, with the inner connecting shell connected to the bottom of the bottle and the outer cover shell bent upwards and extending to wrap around the bottle.

[0009] In the aforementioned explosion-proof dry powder fire extinguisher, the top of the outer casing is bent to form a connecting part that matches the shape of the bottle mouth wall. The connecting part mates with the bottle mouth, and the inner wall of the connecting part has threads.

[0010] The connecting part matches the shape and structure of the bottle mouth. The connecting part directly snaps into the bottle mouth to connect the top of the outer casing to the bottle body. Since the bottle mouth is a convex cylindrical shape, the connecting part matches this shape. This matching connection structure achieves a snap-fit ​​connection that is firm and reliable. At this point, the connecting part replaces the bottle mouth. The valve body on the nozzle head is screwed onto the connecting part, realizing the installation of the nozzle. The connecting part has a dual connection function: firstly, it enables the snap-fit ​​connection between the top of the outer casing and the bottle body; secondly, it facilitates the installation of the nozzle. This connection method eliminates concerns about the sealing of the bottle body and the outer casing at the top, as the final sealing effect lies at the connection between the valve body and the connecting part. Only this sealing point needs to be ensured; therefore, the requirements for the dimensional accuracy of the connecting part and its fit with the bottle mouth are not high, and the processing difficulty is not significant. Furthermore, the connecting part forms a superimposed structure at the bottle mouth at the top of the bottle body, adding an extra layer of protection to the originally fragile bottle mouth and greatly enhancing its strength.

[0011] In the aforementioned explosion-proof dry powder fire extinguisher, the bottle body is a one-piece structure, and the inner connecting shell is welded to the bottle body.

[0012] In this design, the bottle structure is identical to that of a carbon dioxide fire extinguisher, with the bottle being a single, integrated structure. The advantage is that it further enhances the explosion-proof function and strengthens the pressure-bearing capacity of the bottle. The disadvantage is that the bottle manufacturing process is complex and cumbersome, resulting in high processing costs.

[0013] In the aforementioned explosion-proof dry powder fire extinguisher, the bottle body is a split structure, including a main body, an upper cover, and a lower cover. The main body is located between the upper cover and the lower cover. The main body and the upper cover, as well as the main body and the lower cover, are welded together. The bottle opening is located on the upper cover, and the inner connecting shell is welded to the lower cover.

[0014] In this design, the bottle has a split structure, similar to that of a traditional dry powder fire extinguisher, consisting of three sections: upper, middle, and lower. The outer bottle structure already provides excellent explosion-proof performance.

[0015] In the aforementioned explosion-proof dry powder fire extinguisher, the lower end to the upper end of the bottle body, the inner connecting shell, and the outer cover shell all have a thickened section with a wall thickness greater than other parts.

[0016] The term "bottom to end" refers to the area from the bottom to the very bottom. When dry powder fire extinguishers clump together inside, the dry powder accumulates at the bottom, increasing the pressure. This is why the bottom of the cylinder is most prone to explosion, making the strength of the bottom crucial. The thickened section is generally 2-3mm thicker than other parts, greatly enhancing the bottom strength. Triple protection is achieved through the thickened sections at the bottom of the cylinder body, the inner connecting shell, and the outer casing. The inner connecting shell is located at the bottom of the cylinder not only for installation considerations but also to take into account the characteristic of dry powder fire extinguishers being prone to clumping and bottom explosion, demonstrating a comprehensive design.

[0017] In the aforementioned explosion-proof dry powder fire extinguisher, the width of the space gap layer is not less than 2mm.

[0018] An excessively narrow interlayer will result in insufficient width, thus failing to achieve heat insulation and impact protection performance.

[0019] In the aforementioned explosion-proof dry powder fire extinguisher, the inner connecting shell has a radially recessed annular portion, which is welded to the bottom of the bottle body.

[0020] The recessed portion is used to connect the inner connecting shell to the bottom of the bottle.

[0021] In the aforementioned explosion-proof dry powder fire extinguisher, a perforated opening is formed at the connection between the inner connecting shell and the outer cover shell.

[0022] The perforated opening forms a welding operation port, through which welding operations can be performed in the concave part. After the actual welding is completed, it can be sealed with a cap.

[0023] In the aforementioned explosion-proof dry powder fire extinguisher, the outer bottle body is made of the same material as the bottle body.

[0024] The materials for the outer bottle and the bottle body can be common materials used in fire extinguishers, such as steel.

[0025] Compared with existing technologies, this explosion-proof dry powder fire extinguisher has the following advantages:

[0026] 1. This explosion-proof dry powder fire extinguisher features an outer bottle and a non-contact design between the outer bottle and the main body, forming an outer protective layer and a space-isolating gap layer. The combination of the space-isolating gap layer and the encapsulation design enhances the explosion-proof function from multiple factors.

[0027] 2. The outer bottle of this explosion-proof dry powder fire extinguisher has significantly improved explosion-proof performance in the easily explosive areas at both ends through connection points and multiple layers of protection. In particular, the design of the three-layer thickened section at the bottom is well-considered, taking into account the characteristics of dry powder fire extinguishers.

[0028] 3. The outer bottle of this explosion-proof dry powder fire extinguisher features an integrated bending design, which fully considers the safety area and achieves the optimal solution for structure and installation area. Attached Figure Description

[0029] Figure 1 This is a structural cross-sectional view of this explosion-proof dry powder fire extinguisher.

[0030] Figure 2 yes Figure 1 Enlarged view of the structure of region A in the middle.

[0031] Figure 3 yes Figure 1 Enlarged view of the structure of region B in the middle.

[0032] List of reference numerals

[0033] In the picture, 1. Bottle body;

[0034] 1a. Bottle mouth;

[0035] 1b. Main body;

[0036] 1c. Upper cover;

[0037] 1d, lower cover;

[0038] 2. Device head;

[0039] 2a. Valve body;

[0040] 3. Nozzle;

[0041] 4. Outer bottle body;

[0042] 41. Space-separating gap layer;

[0043] 4a. Inner connecting housing;

[0044] 4a1, Concave portion;

[0045] 4b. Outer casing;

[0046] 4b1. Connecting part;

[0047] 5. Thickened section;

[0048] 6. Hollowed-out opening. Detailed Implementation

[0049] Example 1

[0050] like Figures 1 to 3As shown, this explosion-proof dry powder fire extinguisher includes a cylinder body 1, a nozzle 2, and a nozzle 3. The nozzle 2 is connected to the top of the cylinder body 1. The top of the cylinder body 1 has a bottle opening 1a. The inner end of the nozzle 3 extends into the cylinder body 1 from the bottle opening 1a. It also includes an outer cylinder body 4. The cylinder body 1 is located inside the outer cylinder body 4 and the two are connected. There is a circular space gap layer 41 between the outer wall of the cylinder body 1 and the inner wall of the outer cylinder body 4. The cylinder body 1, nozzle 2, and nozzle 3 in this dry powder fire extinguisher are all existing technologies, and specific details and connection structures are not described in detail. This dry powder fire extinguisher features an outer bottle body 4 that encloses the bottle body 1. The outer bottle body 4 and the bottle body 1 are designed to form a non-contact space gap layer 41. This space gap layer 41, combined with the enclosing design, significantly enhances the explosion-proof function. Specifically, the outer bottle body 4 provides direct protection by enclosing the bottle body 1, preventing corrosion and reducing the impact force from the outside. Internally, when the bottle body 1 explodes, the design of the outer bottle body 4 reduces the explosive force, minimizing damage. When the bottle body 1 has not exploded but shows a tendency to explode, the outer bottle body 4 acts as a second barrier, preventing the explosion as much as possible, providing double protection. Secondly, the space gap layer also serves multiple purposes. The gap prevents ordinary external impacts from reaching the bottle body 1, directly avoiding deformation and reducing heat conduction, thus minimizing pressure changes caused by high temperatures affecting the medium inside the bottle body 1.

[0051] The outer bottle body 4 includes an inner connecting shell 4a and an outer cover shell 4b. The inner connecting shell 4a is located at the bottom of the bottle body 1, and is cylindrical with its inner end connected to the bottom of the bottle body 1. The outer end of the inner connecting shell 4a bends and extends from the outside towards the top of the bottle body 1 to form a cylindrical outer cover shell 4b. The top of the outer cover shell 4b is connected to the top of the bottle body 1, and a space gap layer 41 is formed between the outer cover shell 4b and the bottle body 1. The inner connecting shell 4a and the outer cover shell 4b can be an integral structure, with the inner connecting shell 4a connected to the bottom of the bottle body 1 and the outer cover shell 4b bending upward to wrap around the bottle body 1. The top of the outer cover shell 4b bends to form a connecting part 4b1 that matches the shape of the bottle mouth 1a wall. The connecting part 4b1 fits with the bottle mouth 1a, and the inner wall of the connecting part 4b1 has threads. The connecting part 4b1 matches the shape and structure of the bottle mouth 1a. The connecting part 4b1 directly snaps into the bottle mouth 1a to connect the top of the outer casing 4b to the bottle body 1. Since the bottle mouth 1a is a convex cylindrical shape, the connecting part 4b1 matches this shape. This matching connection structure achieves a snap-fit ​​connection, which is firm and reliable. At this point, the connecting part 4b1 replaces the bottle mouth 1a. The valve body 2a on the nozzle head 2 is screwed onto the connecting part 4b1, realizing the installation of the nozzle 3. The connecting part 4b1 has a dual connection function: firstly, it enables the top of the outer casing 4b to snap into the bottle body 1; secondly, it enables the installation of the nozzle 3. This connection method eliminates concerns about the sealing of the bottle body 1 and the outer casing 4b at the top, as the final sealing effect lies at the connection between the valve body 2a and the connecting part 4b1. Only this sealing point needs to be addressed. Therefore, the requirements for the dimensional accuracy of the connecting part 4b1 and its fit with the bottle mouth 1a are not high, and the processing difficulty is not significant. In addition, the connecting part 4b1 forms a superimposed structure at the bottle mouth 1a at the top of the bottle body 1, which adds a layer of protection to the originally fragile bottle mouth 1a and greatly enhances its strength.

[0052] The cylinder body 1 is a one-piece structure, with the inner connecting shell 4a welded to it. In this design, the structure of the cylinder body 1 is consistent with that of a carbon dioxide fire extinguisher. The advantage of the one-piece structure is that it further enhances the explosion-proof function and strengthens the pressure-bearing capacity of the cylinder body 1. The disadvantage is that the manufacturing process of the cylinder body 1 is complex and cumbersome, resulting in high manufacturing costs. The lower and upper ends of the cylinder body 1, the inner connecting shell 4a, and the outer shell 4b all have a thickened section 5 with a wall thickness greater than other parts. When dry powder fire extinguishers clump together, the dry powder accumulates at the bottom, increasing the pressure. This is why the bottom of the cylinder body 1 is most prone to explosion. Therefore, the strength of the bottom of the cylinder body 1 is crucial. The thickened section 5 is generally 2-3 mm thicker than other parts, greatly enhancing the bottom strength. The thickened section 5 at the lower end of the cylinder body 1, the inner connecting shell 4a, and the outer shell 4b provides triple protection. The inner connecting shell 4a is located at the bottom of the cylinder body 1 not only for installation considerations but also to take into account the characteristic of dry powder fire extinguishers being prone to clumping and bottom explosion. The design is comprehensive.

[0053] The width of the space gap layer 41 is 4mm. An excessively narrow space gap layer 41 would prevent the creation of sufficient width, thus failing to achieve heat insulation and impact resistance. The inner connecting shell 4a has a radially recessed annular portion 4a1, which is welded to the bottom of the bottle body 1. The recessed portion 4a1 connects the inner connecting shell 4a to the bottom of the bottle body 1. A perforation 6 is formed at the junction of the inner connecting shell 4a and the outer cover shell 4b. The perforation 6 forms a welding operation port, allowing welding to be performed through the perforation 6 in the recessed portion 4a1. After welding, the bottle can be sealed with a cap. The outer bottle body 4 is made of the same material as the bottle body 1. Both the outer bottle body 4 and the bottle body 1 are made of carbon steel.

[0054] Example 2

[0055] The difference between this embodiment and Embodiment 1 is that the bottle body 1 has a split structure, including a main body 1b, an upper cover 1c, and a lower cover 1d. The main body 1b is located between the upper cover 1c and the lower cover 1d. The main body 1b is welded to the upper cover 1c, and the main body 1b is welded to the lower cover 1d. The bottle opening 1a is located on the upper cover 1c, and the inner connecting shell 4a is welded to the lower cover 1d. In this design, the bottle body 1 has a split structure. This bottle body 1 is the traditional dry powder fire extinguisher bottle body 1, divided into three sections: upper, middle, and lower. The outer bottle body 4 structure already provides excellent explosion-proof performance.

[0056] Details of the structure, specific component dimensions and principles not mentioned in this application are all common knowledge or can be derived by those skilled in the art through simple selection, and will not be elaborated upon.

[0057] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An explosion-proof dry powder fire extinguisher, comprising a cylinder body, a nozzle, and a spray pipe, wherein the nozzle is connected to the top of the cylinder body, the top of the cylinder body has a nozzle opening, and the inner end of the spray pipe extends into the cylinder body from the nozzle opening, characterized in that... It also includes an outer bottle body, which is located inside the outer bottle body and the two are connected. There is a circular space gap layer between the outer wall of the bottle body and the inner wall of the outer bottle body.

2. The explosion-proof dry powder fire extinguisher according to claim 1, characterized in that, The outer bottle body includes an inner connecting shell and an outer cover shell. The inner connecting shell is located at the bottom of the bottle body. The inner connecting shell is cylindrical and its inner end is connected to the bottom of the bottle body. The outer end of the inner connecting shell bends and extends from the outside towards the top of the bottle body to form the cylindrical outer cover shell. The top of the outer cover shell is connected to the top of the bottle body. The outer cover shell and the bottle body form the space gap layer.

3. The explosion-proof dry powder fire extinguisher according to claim 2, characterized in that, The top of the outer casing is bent to form a connecting part that matches the shape of the bottle mouth wall. The connecting part mates with the bottle mouth, and the inner wall of the connecting part has threads.

4. The explosion-proof dry powder fire extinguisher according to claim 2 or 3, characterized in that, The bottle body is a one-piece structure, and the inner connecting shell is welded to the bottle body.

5. The explosion-proof dry powder fire extinguisher according to claim 2 or 3, characterized in that, The bottle body has a split structure, including a main body, an upper cover, and a lower cover. The main body is located between the upper cover and the lower cover. The main body is welded to the upper cover and the main body is welded to the lower cover. The bottle mouth is located on the upper cover. The inner connecting shell is welded to the lower cover.

6. The explosion-proof dry powder fire extinguisher according to claim 2 or 3, characterized in that, The bottle body, the inner connecting shell, and the outer cover shell all have a thickened section from the lower end to the upper end, with a wall thickness greater than other parts.

7. The explosion-proof dry powder fire extinguisher according to claim 1, characterized in that, The width of the spacer layer is not less than 2 mm.

8. The explosion-proof dry powder fire extinguisher according to claim 2 or 3, characterized in that, The inner connecting shell has a radially recessed, annular portion, which is welded to the bottom of the bottle.

9. The explosion-proof dry powder fire extinguisher according to claim 2 or 3, characterized in that, A perforation is formed at the connection between the inner connecting shell and the outer cover shell.

10. The explosion-proof dry powder fire extinguisher according to claim 1, characterized in that, The outer bottle body is made of the same material as the bottle body.

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