Coal mine underground explosion-proof distribution box with double-sealed cavity

Abstract

The utility model provides a coal mine underground explosion -proof distribution box of area with double sealed cavity belongs to distribution box technical field, including first box body and second box body, second box body sets up in first box body, is provided with first sealed cavity between first box body and second box body, is provided with the mounting support in first sealed cavity, is provided with multiple sets of air cushion in mounting support, is provided with multiple sets of cold -conducting plate between mounting support and second box body, is seted up in second sealed cavity in second box body, is provided with the baffle in second sealed cavity, first box door is provided with first box body one end, is provided with sealing washer between first box door and first box body, forms multilayer sealed protection structure through the cooperation setting of air cushion and sealing washer, can multidirectional reduction gas, dust and so on dangerous medium's infiltration passage, effectively solve the problem that single seal is easy to fail, when using the device, the user can take away the heat that electrical element produces in second sealed cavity through the cold -conducting plate, has promoted the heat dissipation efficiency of the device.

Description

Technical Field

[0001] This utility model belongs to the field of distribution box technology, and more specifically, it relates to an explosion-proof distribution box for underground coal mines with a double-sealed cavity. Background Technology

[0002] Coal mines are typical explosive hazardous environments. The air contains not only methane gas with fluctuating concentrations, but also a large amount of coal dust. In addition, the relative humidity is high and the temperature difference between day and night is large. In order to prevent gas and dust from seeping into the distribution box and causing short circuits and explosions, explosion-proof distribution boxes are required. This can effectively reduce the intrusion of dangerous media, protect internal electrical components, and reduce the incidence of safety accidents. However, traditional devices often employ a single-layer enclosure and a single sealing ring. In the high-humidity, high-dust environment of underground mines, the sealing ring is prone to aging, deformation, and even cracking over time, leading to increased sealing gaps. Relying solely on a single, tight seal between the enclosure and the door means that when the enclosure is subjected to vibration or impact underground, the sealing surface is susceptible to slight displacement, further exacerbating the risk of seal failure and impacting underground operational safety. Furthermore, traditional devices are often designed as fully enclosed structures, preventing the effective dissipation of heat generated by internal electrical components. This results in higher internal temperatures, accelerating the aging of component insulation layers and reducing equipment lifespan. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides an explosion-proof power distribution box for underground coal mines with dual sealing cavities, thus solving the technical problems of insufficient sealing reliability and fully enclosed structures in existing technologies where traditional devices often employ a single sealing structure.

[0004] The purpose and effectiveness of this utility model's explosion-proof distribution box with double-sealed cavities in underground coal mines are achieved through the following specific technical means: An explosion-proof distribution box for underground coal mines with dual sealing cavities includes a first enclosure and a second enclosure. The second enclosure is disposed within the first enclosure. A first sealing cavity is provided between the first enclosure and the second enclosure. A mounting bracket is disposed within the first sealing cavity. Multiple sets of air cushions are disposed within the mounting bracket. Multiple sets of cooling plates are disposed between the mounting bracket and the second enclosure. A second sealing cavity is opened within the second enclosure. A partition is disposed within the second sealing cavity. A first door is provided at one end of the first enclosure. A sealing gasket is disposed between the first door and the first enclosure.

[0005] Ideally, an air pump is installed in the first chamber, with an air cylinder on one side of the air pump and a water pump on the other side, and a water tank on one side of the water pump.

[0006] Ideally, one end of the air pump is connected to the gas cylinder via a first pipeline, and the other end of the first pipeline passes through the first housing and is connected to the air cushion. Both the gas cylinder and the air cushion are filled with nitrogen.

[0007] Ideally, a second pipeline is provided inside the first door, with one end of the second pipeline passing through the sealing gasket and the mounting bracket and connecting to the cooling plate, and the other end connecting to the water pump and the water tank.

[0008] Ideally, the sealing gasket has multiple sets of grooves, each set of grooves having a V-shaped cross-section, and the first door has multiple sets of sealing strips, each set of sealing strips having a V-shaped cross-section.

[0009] Optimally, one end of each of the multiple sets of sealing strips is respectively disposed in the multiple sets of grooves, and a second door is disposed below the first door. Both the first door and the second door are rotatably connected to the first box body.

[0010] Ideally, the partition is provided with a moisture-absorbing plate on the side near the cold-conducting plate and a heat-conducting plate on the other side. One end of the sealing gasket is integrally formed with multiple sets of guide strips, which are respectively disposed in the mounting bracket.

[0011] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes the combination of an air cushion, a sealing gasket, and a sealing strip to form a multi-layered sealing and protective structure. The nitrogen filling the air cushion can be pressurized by an air pump, and the elasticity of the gas ensures a tight seal between the sealing surfaces. Combined with the V-groove of the sealing gasket and the interlocking seal of the sealing strip, this design effectively reduces the infiltration channels for hazardous media such as gas and dust from multiple directions. This allows users to effectively solve the problem of easy failure of traditional single seals, thus improving the sealing reliability of the device. When the device is installed or the sealing pressure is insufficient, the user can use an air pump to replenish nitrogen to the air cushion to maintain the sealing pressure of the first sealing chamber, ensuring the continuous effectiveness of the multi-layered sealing structure. This eliminates the need for frequent replacement of sealing components, improving the device's sealing durability.

[0012] When using this device, the user can start the water pump to allow the coolant in the water tank to circulate through the second pipeline and pass through the cooling plate, thereby removing the heat generated by the electrical components in the second sealed cavity. This reduces the problem of poor heat dissipation in traditional fully enclosed structures and improves the heat dissipation efficiency of the device. Then, the moisture-absorbing plate on the side of the partition closest to the cooling plate absorbs moisture from the air, while the heat-conducting plate on the other side assists in heat transfer. This reduces the generation of condensate on the inner wall of the second chamber, preventing condensate from corroding the electrical components. This lowers the cost of equipment failure maintenance for the user and improves the operational stability of the device in harsh, high-humidity environments. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the novel front view structure of this utility model; Figure 2 This is a schematic diagram of the disassembled structure of this utility model; Figure 3 This is a schematic diagram of the structure of this utility model; Figure 4 This is a schematic diagram of the second box body and partition structure of this utility model; Figure 5 This is a schematic diagram of the mounting bracket, air cushion, and cooling plate structure of this utility model.

[0014] In the diagram, the correspondence between component names and their corresponding reference numerals is as follows: 11. First enclosure; 12. Second enclosure; 13. First enclosure door; 14. Sealing gasket; 15. Air pump; 16. Water pump; 17. Sealing strip; 18. Second enclosure door; 21. Mounting bracket; 22. Air cushion; 23. Cooling plate; 24. Partition. Detailed Implementation

[0015] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the technical solution of this utility model, but should not be used to limit the scope of protection of this utility model. Example

[0016] like Figures 1 to 5As shown, this utility model provides an explosion-proof distribution box for underground coal mines with double sealing cavities, including a first box 11 and a second box 12. The second box 12 is disposed inside the first box 11. A first sealing cavity is provided between the first box 11 and the second box 12. A mounting bracket 21 is disposed inside the first sealing cavity. Multiple sets of air cushions 22 are disposed inside the mounting bracket 21. Multiple sets of cooling plates 23 are disposed between the mounting bracket 21 and the second box 12. A second sealing cavity is opened inside the second box 12. A partition 24 is disposed inside the second sealing cavity. A first door 13 is provided at one end of the first box 11. A sealing gasket 14 is disposed between the first door 13 and the first box 11. An air pump 15 and a water pump 16 are respectively disposed inside the first box 11. A gas cylinder is disposed on one side of the air pump 15, and a water tank is disposed on one side of the water pump 16. The air pump 15 passes through... The first pipeline is connected to the gas cylinder and the air cushion 22, both of which are filled with nitrogen. A second pipeline is installed inside the first box door 13. One end of the second pipeline passes through the sealing gasket 14 and the mounting bracket 21 and is connected to the cooling plate 23. The other end is connected to the water pump 16 and the water tank. Multiple sets of V-shaped grooves are opened inside the sealing gasket 14. Multiple sets of V-shaped sealing strips 17 are installed inside the first box door 13. One end of the sealing strip 17 is located in the groove. A second box door 18 is installed below the first box door 13. Both are rotatably connected to the first box body 11. A moisture-absorbing plate is installed on the side of the partition 24 near the cooling plate 23, and a heat-conducting plate is installed on the other side. Multiple sets of guide strips are integrally formed on one end of the sealing gasket 14. The guide strips are respectively installed in the mounting bracket 21. Openings for pipeline passage are opened on the first box body 11, the air cushion 22, and the mounting bracket 21.

[0017] Specifically, the first enclosure 11 provides the outer layer of protection and installation foundation for the entire distribution box. The first enclosure 11 can be made of high-strength explosion-proof steel plate, which has impact resistance and corrosion resistance, and can withstand the collision and erosion of the harsh environment in the coal mine. The second enclosure 12 is set inside the first enclosure 11, forming an inner and outer double-layer structure. The first sealed cavity between the two is a buffer protection cavity, and the second sealed cavity is an electrical component installation cavity. The double cavity design realizes graded protection and improves the reliability of explosion-proof sealing.

[0018] Specifically, the mounting bracket 21 is fixed inside the first sealed cavity, providing mounting support for the air cushion 22 and the cooling plate 23. Its frame structure ensures installation stability without hindering gas flow and heat transfer within the first sealed cavity. Multiple sets of air cushions 22 are evenly distributed within the mounting bracket 21 and are connected to the air pump 15 and gas cylinder through the first pipeline. The air pump 15 can replenish nitrogen to the air cushions 22 to maintain their inflated state, allowing the air cushions 22 to fit tightly against the inner walls of the first housing 11 and the second housing 12, forming an elastic sealing barrier.

[0019] Specifically, the air pump 15 works with the gas cylinder to provide a continuous and stable nitrogen source for the air cushion 22. As an inert gas, nitrogen is non-flammable and non-explosive, which can not only ensure the sealing pressure of the air cushion 22, but also prevent the generation of flammable and explosive media in the first sealing cavity, thereby further improving the explosion-proof safety. The first pipeline adopts an explosion-proof sealing design, and the part that passes through the first housing 11 is sealed to prevent gas and dust from seeping in from the pipeline penetration point, thus ensuring the sealing integrity of the first sealing cavity.

[0020] Specifically, the cooling plate 23 is evenly arranged between the mounting bracket 21 and the second housing 12. It is made of a metal material with excellent thermal conductivity. One side of the plate is attached to the outer wall of the second housing 12, and the other side forms a circulation channel with the water pump 16 and the water tank through the second pipeline. The water pump 16 drives the coolant in the water tank to flow through the cooling plate 23, which can quickly remove the heat generated by the electrical components in the second sealed cavity, thus solving the problem of poor heat dissipation in traditional fully enclosed distribution boxes.

[0021] Specifically, the second pipeline is concealed inside the first box door 13, which avoids the pipeline from being exposed and damaged, and ensures the sealing performance after the first box door 13 is closed. The penetration points of the pipeline with the sealing gasket 14 and the mounting bracket 21 are all sealed with sealing rings to ensure that there is no leakage during the circulation of coolant, while not compromising the overall sealing performance of the first sealing cavity.

[0022] Specifically, the sealing gasket 14 can be made of rubber, and the multiple sets of V-shaped grooves inside it can be interlocked with the V-shaped sealing strip 17 inside the first door 13. After the first door 13 is closed, the sealing strip 17 adheres to the V-shaped grooves under pressure, forming a multi-line sealing structure. Compared with the traditional single seal, the sealing contact area is larger and the sealing effect is more reliable.

[0023] Specifically, both the first door 13 and the second door 18 are rotatably connected. The first door 13 corresponds to the first sealing cavity, and the second door 18 can be opened independently, facilitating maintenance of auxiliary equipment such as the air pump 15 and water pump 16 without having to open the entire enclosure, thus reducing the risk of seal failure. Both doors are equipped with explosion-proof hinges at their rotatable connections to ensure connection strength and sealing performance.

[0024] Specifically, the partition 24 is disposed in the second sealed cavity, dividing the second sealed cavity into a heat dissipation area and a component mounting area. The moisture-absorbing plate on the side near the cold-conducting plate 23 is made of a high moisture absorption rate adsorption material, which can adsorb the moisture in the second sealed cavity and prevent condensation from occurring in a high-humidity environment. The heat-conducting plate on the other side can transfer the heat generated by the electrical components to the partition 24, and then conduct it to the cold-conducting plate 23 through the partition 24, thereby helping to improve the heat dissipation efficiency.

[0025] Specifically, the guide strip at one end of the sealing gasket 14 cooperates with the positioning groove of the mounting bracket 21 to guide and position the gasket when the first door 13 is closed, ensuring that the sealing gasket 14 and the sealing surface of the first housing 11 are precisely fitted together, avoiding sealing gaps due to misalignment. The interlocking structure of the guide strip and the mounting bracket 21 also enhances the installation stability of the sealing gasket 14 and prevents the sealing gasket 14 from shifting due to housing vibration.

[0026] Specifically, the cooling plate 23 is attached to the outer wall of the second housing 12, allowing the cooling energy generated by the coolant circulation to be directly transferred to the second housing 12, quickly reducing the temperature of the second sealed cavity and preventing electrical components from being damaged due to high temperature aging. Multiple sets of cooling plates 23 are evenly distributed to ensure uniform heat dissipation in all parts of the second housing 12, without any localized high-temperature dead zones.

[0027] Specifically, the V-shaped groove and V-shaped sealing strip 17 fit together by utilizing the self-tightening properties of the V-shaped structure. The greater the closing pressure of the box door, the tighter the seal strip 17 fits the groove. This structure can adapt to the slight deformation of the box body. Even if the box body is slightly displaced by underground vibration, it can still maintain a good sealing state, thus solving the problem that traditional seals are prone to failure due to vibration.

[0028] Specifically, the two-way cooperation between the moisture-absorbing plate and the heat-conducting plate not only solves the moisture problem in the second sealing cavity, but also enhances the heat dissipation effect, prevents condensation from corroding electrical components, delays component aging, extends the service life of the distribution box, and ensures the long-term stable operation of electrical equipment in underground coal mines.

[0029] Specifically, the dual sealing structure of the first and second sealing cavities, combined with the elastic sealing of the air cushion 22 and the interlocking sealing of the sealing gasket 14 and the sealing strip 17, forms a comprehensive and seamless sealing protection system that can effectively block the infiltration channels of dangerous media such as gas, coal dust, and moisture, thus meeting the explosion-proof safety requirements of underground coal mines.

[0030] The specific usage and function of this embodiment are as follows: When using the device, the user first fixes the distribution box to the designated installation location underground, opens the first box door 13, and installs the electrical control components on one side of the partition 24 inside the second sealed cavity. Then, the second box 12 is closed. When closing the first box door 13, the guide strip of the sealing gasket 14 is precisely aligned with the positioning groove of the mounting bracket 21, so that the V-shaped sealing strip 17 is completely embedded in the V-shaped groove of the sealing gasket 14, achieving initial sealing. Then, the air pump 15 is started, and nitrogen is drawn from the gas cylinder through the first pipeline and injected into multiple sets of air cushions 22 until the air cushions 22 expand and tightly adhere to the inner walls of the first box 11 and the second box 12, forming an elastic sealing barrier, completing the start-up of the double sealing system. When the electrical components are running, the water pump 16 is started according to the temperature monitoring results of the second sealed cavity, and the water tank is filled with water. The coolant circulates through the second pipeline and passes through the cooling plate 23. The cooling plate 23, in close contact with the outer wall of the second housing 12, carries away heat. At the same time, the heat-conducting plate on one side of the partition 24 conducts heat from the components to the partition 24, assisting in heat dissipation. The moisture-absorbing plate simultaneously absorbs moisture in the second sealed cavity, preventing condensation. During routine maintenance, the second housing door 18 can be opened separately to check and replenish the air pump 15, water pump 16, gas cylinder, and water tank without opening the first housing door 13, reducing the risk of seal failure. If electrical components need to be repaired, the power to the equipment can be turned off and the first housing door 13 can be opened. After the repair is completed, the sealing and restarting steps can be repeated to restore use. This ensures the reliability of the explosion-proof seal, while also taking into account heat dissipation and maintenance needs, ensuring the long-term stable operation of electrical equipment in coal mines and reducing the incidence of safety accidents.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments.

Claims

1. An explosion-proof distribution box for underground coal mines with double-sealed cavities, comprising a first enclosure (11) and a second enclosure (12), characterized in that: The second box (12) is disposed inside the first box (11). A first sealing cavity is provided between the first box (11) and the second box (12). An installation bracket (21) is provided in the first sealing cavity. Multiple air cushions (22) are provided in the installation bracket (21). Multiple cold-conducting plates (23) are provided between the installation bracket (21) and the second box (12). A second sealing cavity is opened in the second box (12). A partition (24) is provided in the second sealing cavity. A first box door (13) is provided at one end of the first box (11). A sealing gasket (14) is provided between the first box door (13) and the first box (11).

2. The explosion-proof distribution box with double-sealed cavities in coal mines according to claim 1, characterized in that: An air pump (15) is installed in the first housing (11). An air cylinder is installed on one side of the air pump (15) and a water pump (16) is installed on the other side. A water tank is installed on one side of the water pump (16).

3. The explosion-proof distribution box with double-sealed cavities in coal mines according to claim 2, characterized in that: One end of the air pump (15) is connected to the gas cylinder through a first pipeline, and the other end of the first pipeline passes through the first box (11) and is connected to the air cushion (22). Both the gas cylinder and the air cushion (22) are filled with nitrogen.

4. The explosion-proof distribution box for underground coal mines with double-sealed cavities according to claim 3, characterized in that: The first door (13) is provided with a second pipeline. One end of the second pipeline passes through the sealing gasket (14) and the mounting bracket (21) and is connected to the cooling plate (23). The other end is connected to the water pump (16) and the water tank.

5. The explosion-proof distribution box for underground coal mines with double-sealed cavities according to claim 1, characterized in that: The sealing gasket (14) has multiple sets of grooves, and the cross-section of each set of grooves is V-shaped. The first door (13) is provided with multiple sets of sealing strips (17), and the cross-section of each set of sealing strips (17) is V-shaped.

6. The explosion-proof distribution box for underground coal mines with double-sealed cavities according to claim 5, characterized in that: One end of each of the multiple sets of sealing strips (17) is respectively set in the multiple sets of grooves. A second box door (18) is provided below the first box door (13). Both the first box door (13) and the second box door (18) are rotatably connected to the first box body (11).

7. The explosion-proof distribution box for underground coal mines with double-sealed cavities according to claim 1, characterized in that: The partition (24) has a moisture-absorbing plate on one side near the cold-conducting plate (23) and a heat-conducting plate on the other side. The sealing gasket (14) has multiple sets of guide strips integrally formed at one end, and the multiple sets of guide strips are respectively set in the mounting bracket (21).

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