An explosion-proof electrical control box that promotes the extinguishing of flame gases

Abstract

An explosion-proof electrical control box for promoting flame gas extinction includes a box body and a matching cover. The mating area between the box body and the cover forms a flame channel. Multiple first energy-dissipating mechanisms are arranged along the flame channel on the box body, and multiple second energy-dissipating mechanisms, each corresponding to one of the first energy-dissipating mechanisms, are arranged on the cover. The first and second energy-dissipating mechanisms have identical structures, each including an energy-dissipating cavity, an energy-dissipating ball, and an energy-dissipating channel. The energy-dissipating cavity communicates with the flame channel through the energy-dissipating channel, and the energy-dissipating ball is rotatably disposed inside the energy-dissipating cavity. This design not only improves the explosion-proof effect of the electrical control box but also has a simple structure and does not affect the arrangement of other components within the electrical control box.

Description

Technical Field

[0001] This invention belongs to the field of electrical control boxes, specifically relating to an explosion-proof electrical control box suitable for promoting flame gas extinguishing in explosive dust or gas environments. Background Technology

[0002] Currently, in the field of explosion-proof equipment, a large number of flameproof electrical control boxes are used in hazardous dust or gas environments. According to national standards, flameproof electrical control boxes must meet two requirements: 1) They must be able to withstand an internal explosion of a flammable mixture that has entered the enclosure without damage; 2) They must not ignite an external explosive atmosphere formed by one or more gases or vapors through any mating surfaces or openings on the enclosure. In practical applications, the first requirement is usually achieved by increasing the strength of the internal structure of the enclosure; the second requirement is usually guided by GB3836 "Electrical Apparatus for Explosive Gas Atmospheres," which controls the gap between the enclosure and the external environment, and specifies the minimum dimensions of the mating surfaces to ensure the length of the flame path, thereby ensuring that the flame will not ignite gases in the external environment through the gaps in the mating surfaces. However, after the equipment has been in operation for a period of time, the roughness of the mating surfaces and the gap dimensions change due to dirt in the working environment and friction during opening and closing, thus reducing the flameproof capability.

[0003] In response to the above situation, regular maintenance is usually used to control the technical condition of the equipment. However, in environments with severe air pollution, the frequency of maintenance will be higher, which will not only significantly increase the workload of maintenance, but also increase the downtime loss costs caused by equipment maintenance. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the prior art by providing an explosion-proof electrical control box that promotes the extinguishing of flame gases.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] An explosion-proof electrical control box for promoting the extinguishing of flame gases includes a box body and a cover that fits therewith;

[0007] The junction of the housing and the lid forms a flame channel. Multiple first energy release mechanisms are provided on the housing along the flame channel. Multiple second energy release mechanisms, each corresponding to one of the first energy release mechanisms, are provided on the lid. The first and second energy release mechanisms have the same structure, each including an energy release cavity, an energy release ball, and an energy release channel. The energy release cavity is connected to the flame channel through the energy release channel. The energy release ball is rotatably disposed inside the energy release cavity.

[0008] The energy-dissipating cavity contains multiple energy-dissipating spheres, and the gap between adjacent energy-dissipating spheres is less than or equal to 0.2 times the diameter of the energy-dissipating sphere.

[0009] The energy-dissipating sphere has multiple through holes inside.

[0010] The first and second energy release mechanisms also include a plurality of energy release ribs evenly distributed on the inner wall of the energy release cavity. The outer arc surface of the energy release rib is fitted and fixed to the inner wall of the energy release cavity, the center of the inner arc surface of the energy release rib coincides with the center of the energy release cavity, and a semi-circular side arc surface is provided on both sides of the energy release rib.

[0011] The length of the outer arc surface is greater than the length of the inner arc surface.

[0012] The box body and the box cover are respectively provided with a first multi-right-angle step structure and a second multi-right-angle step structure. The first multi-right-angle step structure and the second multi-right-angle step structure cooperate to form a flame channel. The first energy venting mechanism and the second energy venting mechanism are respectively located inside the steps of the first multi-right-angle step structure and the second multi-right-angle step structure, and the first energy venting mechanism and its corresponding second energy venting mechanism are symmetrically arranged with respect to the flame channel.

[0013] One end of the energy venting channel is connected to the tangent at the lower end of the energy venting chamber, and the other end of the energy venting channel extends horizontally to the flame channel. The energy venting channel is located near the corner of the step it is on.

[0014] A first connecting part is provided on the inner wall of the opening end of the box, and the inner wall of the first connecting part is a first multi-right-angle step structure.

[0015] The inner side of the lid is provided with a second connecting part extending toward the box body, and the outer wall of the second connecting part is a second multi-right-angle step structure.

[0016] The housing, lid, first energy release mechanism, and second energy release mechanism are all made of aluminum bronze.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. In this invention, an explosion-proof electrical control box for promoting the extinguishing of flame gases forms a flame channel at the joint between the box body and the box cover. Multiple first energy-dissipating mechanisms are arranged along the flame channel on the box body, and multiple second energy-dissipating mechanisms, each corresponding to one of the first energy-dissipating mechanisms, are arranged on the box cover. The first and second energy-dissipating mechanisms have identical structures, each including an energy-dissipating cavity, an energy-dissipating ball, and an energy-dissipating channel. The energy-dissipating cavity is connected to the flame channel through the energy-dissipating channel, and the energy-dissipating ball is rotatably disposed inside the energy-dissipating cavity. On the one hand, in the event of an internal explosion, the high-speed gas carrying the flame moves outward from the flame channel, and upon passing through the flame... During the flame channeling process, a portion of the high-speed airflow enters the energy venting chamber through the energy venting channel, creating turbulence within the chamber and driving the energy venting ball to rotate. This not only consumes the kinetic energy of the high-speed gas, reducing its speed and thus shortening the flame length, but also provides more contact opportunities for the airflow, causing unburned combustibles within the airflow to adhere to the energy venting mechanism, which is beneficial for flame extinguishing and improves the explosion-proof effect of the electrical control box. Furthermore, since the energy venting mechanism is located near the flame channel, it does not occupy space for component arrangement within the box, thus avoiding any impact on the electrical control box design. Therefore, this invention not only improves the explosion-proof effect of the electrical control box but also does not affect the arrangement of other components within the box.

[0019] 2. In this invention, the explosion-proof electrical control box for promoting flame gas extinction features a venting ball with multiple through-holes inside. This through-hole structure not only facilitates the non-directional rotation of the venting ball but also induces more complex turbulence in the airflow within the cavity, thereby better dissipating the kinetic energy of the airflow within the cavity. Simultaneously, the inner wall of the venting cavity in this invention is evenly distributed with multiple venting ribs. The outer arc surface of the venting ribs is fitted and fixed to the inner wall of the venting cavity, and the center of the inner arc surface of the venting ribs coincides with the center of the venting cavity. Semi-circular side arc surfaces are formed on both sides of the venting ribs. The multiple venting ribs... The inner arc surface provides a circular space for the energy-dissipating sphere to rotate, while the semi-circular side arc surface causes the airflow entering the energy-dissipating cavity to form a circulation at the gap between the two energy-dissipating ribs. This not only consumes the kinetic energy of the airflow but also keeps the main circulating airflow in the energy-dissipating cavity in an unstable state, which helps the rotation of the energy-dissipating sphere and further consumes the kinetic energy of the airflow. In addition, the flame passage is set in a stepped shape, and the energy-dissipating channel is located at the corner of the step. This structure helps to guide the high-speed airflow to enter the energy-dissipating cavity preferentially. Based on the above structure, the consumption of kinetic energy of the airflow can be further promoted, resulting in a better explosion-proof effect. Therefore, the present invention further improves the explosion-proof effect of the electrical control box. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 for Figure 1 Enlarged view of part A.

[0022] Figure 3 for Figure 2 A schematic diagram of the first energy release mechanism.

[0023] Figure 4 This is a schematic diagram of the structure of the energy-dissipating sphere.

[0024] Figure 5 This is a schematic diagram of the energy-dissipating rib.

[0025] In the figure, there are: box body 1, first multi-right-angle step structure 11, first connecting part 12, box cover 2, second multi-right-angle step structure 21, second connecting part 22, flame channel 3, first energy venting mechanism 4, energy venting cavity 41, energy venting ball 42, through hole 421, energy venting channel 43, energy venting rib 44, outer arc surface 441, inner arc surface 442, side arc surface 443, and second energy venting mechanism 5. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] See Figure 1-Figure 5 An explosion-proof electrical control box for promoting the extinguishing of flame gases includes a box body 1 and a box cover 2 that cooperates with it;

[0028] The junction of the housing 1 and the cover 2 forms a flame channel 3. Multiple first energy release mechanisms 4 are provided on the housing 1 along the flame channel 3. Multiple second energy release mechanisms 5 are provided on the cover 2, each corresponding to one of the first energy release mechanisms 4. The first energy release mechanism 4 and the second energy release mechanism 5 have the same structure, each including an energy release cavity 41, an energy release ball 42, and an energy release channel 43. The energy release cavity 41 is connected to the flame channel 3 through the energy release channel 43. The energy release ball 42 is rotatably disposed inside the energy release cavity 41.

[0029] There are multiple energy-dissipating balls 42 inside the energy-dissipating cavity 41, and the gap between adjacent energy-dissipating balls 42 is less than or equal to 0.2 times the diameter of the energy-dissipating ball 42.

[0030] The energy-dissipating ball 42 has multiple through holes 421 inside.

[0031] The first energy release mechanism 4 and the second energy release mechanism 5 also include a plurality of energy release ribs 44 evenly distributed on the inner wall of the energy release cavity 41. The outer arc surface 441 of the energy release rib 44 is fitted and fixed to the inner wall of the energy release cavity 41. The center of the inner arc surface 442 of the energy release rib 44 coincides with the center of the energy release cavity 41. Semi-circular side arc surfaces 443 are provided on both sides of the energy release rib 44.

[0032] The length of the outer arc surface 441 is greater than the length of the inner arc surface 442.

[0033] The box body 1 and the box cover 2 are respectively provided with a first multi-right-angle step structure 11 and a second multi-right-angle step structure 21. The first multi-right-angle step structure 11 and the second multi-right-angle step structure 21 cooperate to form a flame channel 3. The first energy venting mechanism 4 and the second energy venting mechanism 5 are respectively located inside the steps of the first multi-right-angle step structure 11 and the second multi-right-angle step structure 21, and the first energy venting mechanism 4 and the corresponding second energy venting mechanism 5 are symmetrically arranged with respect to the flame channel 3.

[0034] One end of the energy venting channel 43 is connected to the tangent at the lower end of the energy venting cavity 41, and the other end of the energy venting channel 43 extends horizontally to the flame channel 3. The energy venting channel 43 is arranged near the corner of the step it is located at.

[0035] The inner wall of the opening end of the box 1 is provided with a first connecting part 12, and the inner wall of the first connecting part 12 is a first multi-right-angle step structure 11.

[0036] The inner side of the box cover 2 is provided with a second connecting part 22 extending toward the box body 1, and the outer wall of the second connecting part 22 is a second multi-right-angle step structure 21.

[0037] The housing 1, housing cover 2, first energy release mechanism 4, and second energy release mechanism 5 are all made of aluminum bronze.

[0038] The principle of this invention is explained as follows:

[0039] When an explosion occurs inside the chamber, a high-speed gas flow carrying flames moves outward from the flame channel 3 formed by the junction of the chamber door 2 and the chamber body 1. As it passes the corners of the right-angled step structures, the energy-dissipating channels, located near the corners and oriented in the same direction as the preceding flame channel, guide a portion of the high-speed gas flow through the energy-dissipating channel 43 into the energy-dissipating chamber 41. The high-speed gas flow forms turbulence within the energy-dissipating chamber 41, driving the energy-dissipating ball 42 to rotate, thus consuming the kinetic energy of the gas flow and reducing its speed. Because energy-dissipating mechanisms are installed at each corner of the first multi-right-angled step structure 11 and the second multi-right-angled step structure 21, the high-speed gas flow loses some kinetic energy each time it passes a corner, providing more time for the flame within the gas flow to extinguish. Furthermore, the gas turbulence within the energy-dissipating chamber 41 and the rotating structure of the energy-dissipating ball 42 provide more contact opportunities for the gas flow, making it easier for unburned carbon particles and other combustibles within the gas flow to adhere to the energy-dissipating mechanism, further facilitating flame extinguishing.

[0040] Example 1:

[0041] See Figure 1-Figure 5An explosion-proof electrical control box for promoting flame gas extinction includes a box body 1 and a matching cover 2. A first connecting portion 12 is provided on the inner wall of the open end of the box body 1. The inner wall of the first connecting portion 12 is a first multi-right-angled step structure 11. A second connecting portion 22 extending axially toward the box body 1 is provided on the inner side of the cover 2. The outer wall of the second connecting portion 22 is a second multi-right-angled step structure 21. The first multi-right-angled step structure 11 and the second multi-right-angled step structure 21 cooperate to form a flame channel 3. Each step in the first multi-right-angled step structure 11 and the second multi-right-angled step structure 21 is respectively provided with a first energy-dissipating mechanism 4 and a second energy-dissipating mechanism 5 corresponding to the first energy-dissipating mechanism 4. The first energy-dissipating mechanism 4 and the second energy-dissipating mechanism 5 have the same structure and are symmetrically arranged relative to the flame channel 3. Both the first energy-dissipating mechanism 4 and the second energy-dissipating mechanism 5... The device includes an energy-dissipating cavity 41, multiple energy-dissipating balls 42 rotatably disposed inside the energy-dissipating cavity 41, an energy-dissipating channel 43, and multiple energy-dissipating ribs 44 evenly distributed on the inner wall of the energy-dissipating cavity 41. Each energy-dissipating ball 42 has three through holes 421 inside. The gap between adjacent energy-dissipating balls 42 is less than or equal to 0.2 times the diameter of the energy-dissipating ball 42. One end of the energy-dissipating channel 43 connects to the tangent at the lower end of the energy-dissipating cavity 41, and the other end extends horizontally to the flame channel 3. The energy-dissipating channel 43 is located near the corner of the step it is on. The outer arc surface 441 of the energy-dissipating rib 44 is fitted and fixed to the inner wall of the energy-dissipating cavity 41. The center of the inner arc surface 442 of the energy-dissipating rib 44 coincides with the center of the energy-dissipating cavity 41, and the length of the outer arc surface 441 is greater than the length of the inner arc surface 442. Semi-circular side arc surfaces 443 are provided on both sides of the energy-dissipating rib 44. The housing 1, housing cover 2, first energy release mechanism 4, and second energy release mechanism 5 are all made of aluminum bronze.

Claims

1. An explosion-proof electrical control box for promoting the extinguishing of flame gases, comprising a box body (1) and a box cover (2) therewith, characterized in that: The junction of the box body (1) and the box cover (2) forms a flame channel (3). Multiple first energy release mechanisms (4) are provided on the box body (1) along the flame channel (3). Multiple second energy release mechanisms (5) corresponding to the first energy release mechanisms (4) are provided on the box cover (2). The first energy release mechanism (4) and the second energy release mechanism (5) have the same structure, both including an energy release cavity (41), an energy release ball (42), and an energy release channel (43). The energy release cavity (41) is connected to the flame channel (3) through the energy release channel (43). The energy release ball (42) is rotatably disposed inside the energy release cavity (41). The box body (1) and the box cover (2) are respectively provided with a first multi-right-angle step structure (11) and a second multi-right-angle step structure (21). The first multi-right-angle step structure (11) and the second multi-right-angle step structure (21) cooperate to form a flame channel (3). The first energy venting mechanism (4) and the second energy venting mechanism (5) are respectively located inside the steps of the first multi-right-angle step structure (11) and the second multi-right-angle step structure (21), and the first energy venting mechanism (4) and the corresponding second energy venting mechanism (5) are symmetrically arranged with respect to the flame channel (3). The first energy release mechanism (4) and the second energy release mechanism (5) further include a plurality of energy release ribs (44) evenly distributed on the inner wall of the energy release cavity (41). The outer arc surface (441) of the energy release rib (44) is attached and fixed to the inner wall of the energy release cavity (41). The center of the inner arc surface (442) of the energy release rib (44) coincides with the center of the energy release cavity (41). Semi-circular side arc surfaces (443) are provided on both sides of the energy release rib (44).

2. The explosion-proof electrical control box for promoting flame gas extinction according to claim 1, characterized in that: There are multiple energy-dissipating balls (42) inside the energy-dissipating cavity (41), and the gap between adjacent energy-dissipating balls (42) is less than or equal to 0.2 times the diameter of the energy-dissipating ball (42).

3. An explosion-proof electrical control box for promoting the extinguishing of flame gases according to claim 1 or 2, characterized in that: The energy-dissipating ball (42) has multiple through holes (421) inside.

4. The explosion-proof electrical control box for promoting flame gas extinction according to claim 1, characterized in that: The length of the outer arc surface (441) is greater than the length of the inner arc surface (442).

5. The explosion-proof electrical control box for promoting flame gas extinction according to claim 1, characterized in that: One end of the energy venting channel (43) is connected to the tangent at the lower end of the energy venting cavity (41), and the other end of the energy venting channel (43) extends horizontally to the flame channel (3), and the energy venting channel (43) is arranged near the corner of the step where it is located.

6. The explosion-proof electrical control box for promoting flame gas extinction according to claim 1, characterized in that: The inner wall of the opening end of the box (1) is provided with a first connecting part (12), and the inner wall of the first connecting part (12) is a first multi-right-angle step structure (11). The inner side of the lid (2) is provided with a second connecting part (22) extending toward the box body (1), and the outer wall of the second connecting part (22) is a second multi-right-angle step structure (21).

7. An explosion-proof electrical control box for promoting the extinguishing of flame gases according to claim 1 or 2, characterized in that: The housing (1), the cover (2), the first energy release mechanism (4), and the second energy release mechanism (5) are all made of aluminum bronze.

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