Dust explosion-proof control box

Abstract

The utility model provides a dust explosion-proof control box which comprises a control box body, the control box body is divided into an upper cavity and a lower cavity through a partition plate, and the bottom of the control box body is provided with an explosion-proof connector connected with the lower cavity. The partition plate is provided with a wire passing opening, the lower cavity is provided with a lower Tesla valve used for communicating the lower cavity with the external atmosphere, and the lower Tesla valve is in a non-return mode in the direction from the lower cavity to the external atmosphere. The upper cavity is provided with an upper Tesla valve used for communicating the upper cavity with the lower cavity, and the upper Tesla valve is non-return in the direction from the upper cavity to the lower cavity; dehumidification boxes are arranged in the upper cavity and the lower cavity, and calcium chloride particles are contained in the dehumidification boxes. The utility model has the advantages that the internal insulativity can be improved, the internal and external air pressure can be balanced, and the deflagration separation can be realized.

Description

Technical Field

[0001] This utility model relates to the field of control boxes, specifically to a dust explosion-proof control box. Background Technology

[0002] The control box contains various components, such as main circuit breakers, branch circuit breakers, thermal relays, AC contactors, transformers, fuses, surge protectors, back-end protectors, indicator lights, and terminals. The wiring ports are often equipped with conventional explosion-proof connectors to prevent dust explosions caused by sparking from contact between internal components.

[0003] These include explosion-proof (Exd) types, which use a robust outer casing to seal internal components that may generate sparks, preventing the explosion from spreading to the outside even if an internal explosion occurs.

[0004] Increased safety type (Exe): Improves ordinary electrical equipment to enhance its protection level, prevents dust from entering the equipment, and reduces the possibility of internal failures (mainly by increasing electrical clearances and reducing the operating temperature of electrical components to prevent electrical components from generating sparks, arcs, and high temperatures under normal operation or foreseeable failure conditions. This explosion-proof method mainly focuses on the internal safety of electrical equipment and reduces the risk of explosion by optimizing electrical design and reducing equipment temperature).

[0005] It can be seen that in terms of structural characteristics, the increased safety type explosion-proof box has a relatively simple outer shell design and does not need to withstand internal explosion pressure. Therefore, the requirements for materials and structure are relatively low. It focuses more on the internal structure and layout of electrical equipment to ensure the safe operation of electrical components. On the other hand, the flameproof type explosion-proof box has a more complex structure and design. Its outer shell is usually made of high-strength materials such as aluminum alloy or cast iron and is specially treated to withstand internal explosion pressure. In addition, the joints, holes and other parts of the flameproof type explosion-proof box must also meet the explosion-proof requirements to ensure its good explosion-proof performance. Utility Model Content

[0006] Based on the above problems, the purpose of this utility model is to provide a dust explosion-proof control box that can improve internal insulation, balance internal and external air pressure, and achieve deflagration isolation.

[0007] To address the above problems, the following technical solution is provided: a dust explosion-proof control box, comprising a control box divided into an upper cavity and a lower cavity by a partition, wherein the bottom of the control box is provided with an explosion-proof connector connected to the lower cavity; the partition is provided with a cable passage, the lower cavity is provided with a lower Tesla valve for connecting the lower cavity to the outside atmosphere, the lower Tesla valve being non-returnable in the direction from the lower cavity to the outside atmosphere; the upper cavity is provided with an upper Tesla valve for connecting the upper cavity and the lower cavity, the upper Tesla valve being non-returnable in the direction from the upper cavity to the lower cavity; both the upper cavity and the lower cavity are provided with dehumidification boxes, the dehumidification boxes containing calcium chloride granules.

[0008] The present invention is further configured such that the dehumidifier box includes a box body with a top opening, and the inner wall of the box body is provided with a support net supported by a support step. The support net divides the inner cavity of the box body into a dehumidifier cavity located above the support net and a water collection cavity located below the support net; the calcium chloride granules are placed in the dehumidifier cavity.

[0009] The present invention is further configured such that the dehumidification box is strip-shaped, and the supporting steps are located on the inner walls of both sides in the width direction of the dehumidification box; the cross-section of the bearing net in the length direction presents a V-shape with high sides and low middle.

[0010] The present invention is further configured such that the side wall of the dehumidification chamber is provided with a plurality of side vent holes; the side wall of the water collection chamber near the bearing net is provided with a plurality of lower vent holes arranged in a horizontal direction; and the opening of the dehumidification box is provided with a box cover, the box cover being provided with a plurality of upper vent holes.

[0011] The present invention is further configured such that the horizontal height of the end of the side vent facing the inner cavity of the dehumidifier box is lower than the horizontal height of the end facing away from the inner cavity of the dehumidifier box.

[0012] The present invention is further configured such that a water level detection head is provided on the side wall of the water collection cavity, and the horizontal height of the water level detection head is lower than the horizontal height of the lower vent hole.

[0013] The present invention is further configured such that the water level detection head includes a water baffle tube connected to the side wall of the water collection cavity and extending horizontally, and a water guide oblique opening is provided at the 3 o'clock to 9 o'clock position of the extended end of the water baffle tube; a water level probe is provided inside the water baffle tube.

[0014] The present invention is further configured such that the surface of the supporting mesh is provided with a plurality of mesh holes; the bottom of the V-shaped cross section of the supporting mesh coincides with the axis of the mesh hole at that position.

[0015] The present invention is further configured such that the lower Tesla valve is vertically arranged, with its lower opening located at the bottom of the control box or the side wall of the control box below the lower cavity; the upper Tesla valve is vertically arranged, with its lower opening located at the upper end of the lower cavity.

[0016] The beneficial effects of this utility model are:

[0017] 1. The upper and lower Tesla valves are used to establish a constant pressure environment inside and outside the upper and lower cavities. Contactors and other easily ignited devices are installed in the upper cavity, while the wiring enters the lower cavity's wiring terminal block through an explosion-proof connector and then enters the upper cavity through a wiring port. In the event of internal ignition and deflagration in the upper cavity, the flame can be discharged towards the lower cavity through the upper Tesla valve. At this time, the backflow prevention effect of the upper Tesla valve blocks the flame transmission and relieves pressure. The lower Tesla valve provides secondary explosion protection. In extreme cases, the flame can expand through the lower cavity and then be discharged to the outside through the lower Tesla valve. At this time, the backflow prevention effect of the lower Tesla valve blocks the flame transmission and relieves pressure, achieving a double protection purpose. At the same time, dehumidification boxes are installed at the bottom of the upper and lower cavities. The calcium chloride particles in the dehumidification boxes absorb the moisture in the upper and lower cavities, ensuring that they are dry inside, reducing the length of ignition or arcing, and improving the insulation level.

[0018] 2. The support net is used to support calcium chloride particles, allowing their aqueous solution to enter the water collection cavity after deliquescence; the V-shaped structure facilitates the collection of the aqueous solution after the calcium chloride particles deliquulate, which is beneficial for drainage and reduces water accumulation in the bottom layer of calcium chloride particles.

[0019] 3. The side and top vents facilitate contact between calcium chloride particles and air, while the bottom vents assist in ventilation and allow the relatively saturated aqueous solution to further absorb moisture from the air.

[0020] 4. The water level detection head is used to detect the liquid level in the water collection chamber. When the liquid level is too high due to the deliquescence of calcium chloride granules, the detection module sends an early warning. The inclined water guide can prevent the deliquescent aqueous solution dripping from above the support net from entering the water-blocking cylinder and contacting the water level probe, thus avoiding false alarms.

[0021] 5. When the upper Tesla valve and the lower Tesla valve are set vertically, when there is a temperature change that causes a decrease in the pressure inside the control box and outside air is introduced, the airflow direction is from bottom to top, further reducing the possibility of dust being brought into the control box with the air. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the box structure of this utility model.

[0023] Figure 2 This is a schematic diagram of the right-side full sectional structure of this utility model.

[0024] Figure 3 This is a schematic diagram of the left-side full sectional structure of this utility model.

[0025] Figure 4 This is a three-dimensional structural diagram of the dehumidifier box of this utility model.

[0026] Figure 5 This is a three-dimensional exploded view of the dehumidifier box of this utility model.

[0027] Figure 6 This is a three-dimensional cross-sectional view of the dehumidifier box of this utility model.

[0028] Figure 7 This is a three-dimensional cross-sectional view of the lower Tesla valve of this utility model.

[0029] The labels in the diagram mean: 10-Control box; 11-Partition plate; 111-Cable port; 12-Upper cavity; 13-Lower cavity; 14-Explosion-proof connector; 20-Lower Tesla valve; 30-Upper Tesla valve; 40-Dehumidifier box; 41-Box body; 411-Supporting step; 42-Bearing mesh; 421-Mesh; 43-Dehumidifier chamber; 431-Side vent; 44-Water collection chamber; 441-Lower vent; 45-Box cover; 451-Upper vent; 46-Water level detection head; 461-Water baffle; 462-Water guide bevel; 463-Water level probe. Detailed Implementation

[0030] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0031] refer to Figures 1 to 7 ,like Figures 1 to 7 The dust explosion-proof control box shown includes a control box 10, which is divided into an upper cavity 12 and a lower cavity 13 by a partition 11. The bottom of the control box 10 is provided with an explosion-proof connector 14 connected to the lower cavity 13. The partition 11 is provided with a cable passage 111. The lower cavity 13 is provided with a lower Tesla valve 20 for connecting the lower cavity 13 to the outside atmosphere. The lower Tesla valve 20 is non-reverse in the direction from the lower cavity 13 to the outside atmosphere. The upper cavity 12 is provided with an upper Tesla valve 30 for connecting the upper cavity 12 and the lower cavity 13. The upper Tesla valve 30 is non-reverse in the direction from the upper cavity 12 to the lower cavity 13. Both the upper cavity 12 and the lower cavity 13 are provided with dehumidification boxes 40, which contain calcium chloride granules (not shown in the figure).

[0032] In the above structure, the upper Tesla valve 30 and the lower Tesla valve 20 are used to establish a constant pressure environment for the upper cavity 12 and the lower cavity 13. Contactors and other easily ignited devices are installed inside the upper cavity 12, while the wiring enters the wiring terminal block of the lower cavity 13 via the explosion-proof connector 14 and then enters the upper cavity 12 via the wiring port 111. When internal ignition and deflagration occur in the upper cavity 12, the flame can be discharged towards the lower cavity 13 through the upper Tesla valve 30. At this time, the backflow prevention effect of the upper Tesla valve 30 blocks the flame transmission and relieves pressure, while the lower Tesla valve... Valve 20 provides secondary explosion protection. In extreme cases, the flame can expand through the lower cavity 13 and then be discharged to the outside through the lower Tesla valve 20. At this time, the backflow prevention effect of the lower Tesla valve 20 blocks the transmission of the flame and relieves pressure, achieving the purpose of double protection. At the same time, dehumidification boxes 40 are set at the bottom of the upper cavity 12 and the lower cavity 13. The calcium chloride particles (not shown in the figure) in the dehumidification box 40 absorb the moisture in the upper cavity 12 and the lower cavity 13, ensuring that the inside is dry, reducing the length of sparking or arcing, and improving the insulation level.

[0033] In this embodiment, the dehumidification box 40 includes a box body 41 with a top opening. The inner wall of the box body 41 is provided with a support net 42 supported by a support step 411. The support net 42 divides the inner cavity of the box body 41 into a dehumidification cavity 43 located above the support net 42 and a water collection cavity 44 located below the support net 42. The calcium chloride particles (not shown in the figure) are placed in the dehumidification cavity 43.

[0034] In the above structure, the support mesh 42 is used to support calcium chloride particles (not shown in the figure), so that after they deliquesce, their aqueous solution can enter the water collection chamber 44 for collection.

[0035] In this embodiment, the dehumidification box 40 is strip-shaped, and the supporting steps 411 are located on the inner walls of both sides in the width direction of the dehumidification box 40; the cross-section of the bearing net 42 in the length direction presents a V-shape with high sides and low middle.

[0036] In the above structure, the V-shaped structure facilitates the aggregation of the aqueous solution after the calcium chloride particles (not shown in the figure) deliquesce, which is beneficial for drainage and reduces the water accumulation phenomenon of the bottom calcium chloride particles (not shown in the figure).

[0037] In this embodiment, the dehumidification chamber 43 has a plurality of side ventilation holes 431 on its side wall; the water collection chamber 44 has a plurality of lower ventilation holes 441 arranged in a horizontal direction on its side wall near the support net 42; the dehumidification box 40 has a box cover 45 at its opening, and the box cover 45 has a plurality of upper ventilation holes 451.

[0038] In the above structure, the side vent 431 and the upper vent 451 facilitate the contact between calcium chloride particles (not shown in the figure) and air, while the lower vent 441 assists in air permeability and allows the relatively saturated aqueous solution to further absorb moisture from the air.

[0039] In this embodiment, the horizontal height of the end of the side vent 431 facing the inner cavity of the dehumidification box 40 is lower than the horizontal height of the end facing away from the inner cavity of the dehumidification box 40.

[0040] In the above structure, it is ensured that the deliquescent calcium chloride particles (not shown in the figure) and the aqueous solution can converge into the dehumidification chamber 43.

[0041] In this embodiment, a water level detection head 46 is provided on the side wall of the water collection cavity 44, and the horizontal height of the water level detection head 46 is lower than the horizontal height of the lower vent hole 441.

[0042] In the above structure, the water level detection head 46 is used to detect the liquid level in the water collection chamber 44. When the liquid level is too high after the calcium chloride particles (not shown in the figure) have deliquesced, an early warning is issued to the outside through the detection module (existing technology, not shown in the figure).

[0043] In this embodiment, the water level detection head 46 includes a water baffle 461 that is connected to the side wall of the water collection cavity 44 and extends horizontally. A water guide oblique opening 462 is provided at the 3 o'clock to 9 o'clock position of the extended end of the water baffle 461. A water level probe 463 is provided inside the water baffle 461.

[0044] In the above structure, the water guide oblique opening 462 can prevent the deliquescent aqueous solution dripping from the top of the bearing net 42 from entering the water-blocking cylinder 461 and contacting the water level probe 463, thus avoiding false alarms.

[0045] In this embodiment, the surface of the supporting mesh 42 is provided with a plurality of mesh holes 421; the bottom of the V-shaped cross section of the supporting mesh 42 coincides with the axis of the mesh hole 421 at that position.

[0046] In the above structure, the aqueous solution at the lowest point of the supporting net 42 can be drained in a timely manner.

[0047] In this embodiment, the lower Tesla valve 20 is vertically arranged, and its lower opening is located at the bottom of the control box 10 or the side wall of the control box 10 below the lower cavity 13; the upper Tesla valve 30 is vertically arranged, and its lower opening is located at the upper end of the lower cavity 13.

[0048] In the above structure, when set vertically, when there is a temperature change that causes a decrease in the pressure inside the control box 10 and outside air is introduced, the airflow direction is from bottom to top, further reducing the possibility of dust being brought into the control box 10 with the air.

[0049] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model. These improvements and modifications assumed above should also be considered within the protection scope of the present utility model.

Claims

1. A dust explosion-proof control box, comprising a control box, wherein the control box is divided into an upper cavity and a lower cavity by a partition, and the bottom of the control box is provided with an explosion-proof connector connected to the lower cavity; the partition is provided with a cable passage, characterized in that: The lower cavity is equipped with a lower Tesla valve for connecting the lower cavity to the outside atmosphere, and the lower Tesla valve is non-reverse in the direction from the lower cavity to the outside atmosphere; the upper cavity is equipped with an upper Tesla valve for connecting the upper cavity and the lower cavity, and the upper Tesla valve is non-reverse in the direction from the upper cavity to the lower cavity; both the upper cavity and the lower cavity are equipped with dehumidification boxes, and the dehumidification boxes contain calcium chloride granules.

2. The dust explosion-proof control box according to claim 1, characterized in that: The dehumidifier box includes a box body with an open top. The inner wall of the box body is provided with a support net supported by a support step. The support net divides the inner cavity of the box body into a dehumidifier cavity above the support net and a water collection cavity below the support net. The calcium chloride granules are placed in the dehumidifier cavity.

3. The dust explosion-proof control box according to claim 2, characterized in that: The dehumidifier box is strip-shaped, and the supporting steps are located on the inner walls of both sides in the width direction of the dehumidifier box; the cross-section of the bearing net in the length direction presents a V-shape with high sides and low middle.

4. The dust explosion-proof control box according to claim 2, characterized in that: The dehumidification chamber has several side ventilation holes on its side wall; the water collection chamber has several lower ventilation holes arranged horizontally on its side wall near the support net; the dehumidification box has a lid at its opening, and the lid has several upper ventilation holes.

5. A dust explosion-proof control box according to claim 4, characterized in that: The horizontal height of the end of the side vent facing the inner cavity of the dehumidifier box is lower than the horizontal height of the end facing away from the inner cavity of the dehumidifier box.

6. A dust explosion-proof control box according to claim 4, characterized in that: The water collection chamber is equipped with a water level detection head on its side wall, and the horizontal height of the water level detection head is lower than the horizontal height of the lower vent hole.

7. A dust explosion-proof control box according to claim 6, characterized in that: The water level detection head includes a water baffle tube that is connected to the side wall of the water collection cavity and extends horizontally. A water guide oblique opening is provided at the 3 o'clock to 9 o'clock position at the extended end of the water baffle tube. A water level probe is provided inside the water baffle tube.

8. A dust explosion-proof control box according to claim 3, characterized in that: The surface of the support mesh is provided with a number of mesh holes; the bottom of the V-shaped cross section of the support mesh coincides with the axis of the mesh hole at that position.

9. A dust explosion-proof control box according to claim 1, characterized in that: The lower Tesla valve is vertically positioned, with its lower opening located at the bottom of the control box or on the side wall of the control box below the lower cavity; the upper Tesla valve is vertically positioned, with its lower opening located at the upper end of the lower cavity.

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