An explosion-proof distribution box

Abstract

This utility model belongs to the technical field of power distribution equipment, specifically relating to an explosion-proof power distribution box. It includes a power distribution box door with an observation window, a rotatable protective cover on the outside of the observation window, and an annular raised band around the perimeter of the observation window on the outer wall of the power distribution box door. A sealing groove is formed at the top of the annular raised band, and its sidewalls are inclined. A rotating locking mechanism is provided at one end of the protective cover to control its opening and closing. A sealing ring is fixedly connected to the inner perimeter of the protective cover, and the sealing ring is interference-fitted with the sealing groove. This utility model, through a protective cover located on the outside of the observation window that can be quickly locked, can seal and protect the observation window without affecting its normal use and observation, preventing the glass from shattering and flying everywhere, reducing safety hazards, and preventing dust and oil stains from adhering to the glass of the observation window, thus reducing maintenance frequency and costs.

Description

Technical Field

[0001] This utility model belongs to the field of power distribution equipment technology, specifically relating to an explosion-proof power distribution box. Background Technology

[0002] Explosion-proof distribution boxes are electrical equipment specifically designed for use in hazardous locations. The enclosure is constructed from high-strength materials (such as cast aluminum alloy and steel plates), and the joints are precision-machined to ensure a tight seal. This effectively prevents the accumulation of explosive gases, vapors, dust, and other hazardous substances inside the equipment, thus avoiding explosions. Explosion-proof distribution boxes have a wide range of applications, including chemical, petroleum, coal mining, metallurgy, pharmaceutical, and food industries. Typically, explosion-proof distribution boxes have a glass observation window on the door, eliminating the need for cumbersome opening procedures and allowing for easy observation of the operating status of the electronic components inside.

[0003] Although the glass observation window of the explosion-proof distribution box in the existing technology is made of tempered glass, its impact resistance and explosion-proof capability are still weaker than that of the metal box. If the pressure relief device inside the box fails, the explosion pressure will first impact the observation window area with the largest area, causing the glass to shatter and fly. In addition, when used in some dusty and oily environments (such as flour mills and oil refineries), the surface of the glass observation window is prone to oil and dust adhesion, which obstructs the view and requires frequent maintenance, increasing costs. Utility Model Content

[0004] The purpose of this utility model is to provide an explosion-proof distribution box. By using a protective cover located on the outside of the observation window that can be quickly locked and closed, the observation window can be sealed and protected without affecting its normal use and observation. This prevents the glass from shattering and flying everywhere, reducing safety hazards, and avoiding dust and oil stains adhering to the glass of the observation window, thus reducing maintenance frequency and costs.

[0005] The specific technical solution adopted by this utility model is as follows:

[0006] An explosion-proof distribution box includes a distribution box door with an observation window. The observation window has a rotatable protective cover on its outer side. The outer wall of the distribution box door has an annular raised band around the observation window. The top of the annular raised band has a sealing groove, and its sidewalls are inclined.

[0007] The protective cover is provided with a rotary locking mechanism at one end for controlling the opening and closing of the protective cover;

[0008] A sealing ring is fixedly connected to the inner periphery of the protective cover, and the sealing ring is interference-fitted with the sealing groove.

[0009] The outer wall of the distribution box door has a screw hole on one side of the annular raised strip, and a mounting shaft is fixed on the other side. The protective cover is rotatably connected to the mounting shaft through a bearing at one end.

[0010] A dust cap is movably sleeved at the end of the mounting shaft, and a support plate is provided on the outer edge of the distribution box door to support the protective cover.

[0011] The rotary locking mechanism includes:

[0012] A rotating rod has one end screwed into the screw hole through a threaded groove, and the other end is fixedly connected to a cover. The cover is sleeved on the outside of the rotating rod, and pinch plates are symmetrically fixedly connected to the outer wall of the cover.

[0013] The locking plate fixed to the end of the protective cover has a semi-circular through groove on its edge for the cover cylinder to pass through. An arc-shaped plate is fixedly connected to the side wall of the locking plate for locking between the rotating rod and the cover cylinder.

[0014] The side wall of the distribution box door has a groove inside the sealing ring, and a barrier net is fixedly connected inside the groove.

[0015] The gap D between the protective cover and the distribution box door is set as follows: Where H = height of the annular raised band, and T = thickness of the sealing ring.

[0016] A tie rod is fixed to the outer wall of the protective cover.

[0017] The technical advantages achieved by this utility model are as follows: by using a protective cover located on the outside of the observation window that can be quickly locked and closed, the observation window can be sealed and protected without affecting its normal use and observation, preventing the glass from shattering and flying everywhere, reducing safety hazards, avoiding dust and oil stains from adhering to the glass of the observation window, and reducing maintenance frequency and costs. Attached Figure Description

[0018] Figure 1 This is an overall view of the explosion-proof distribution box provided in an embodiment of this utility model;

[0019] Figure 2 This is a structural separation diagram of the protective cover and the distribution box door provided in an embodiment of this utility model;

[0020] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0021] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle;

[0022] Figure 5 yes Figure 3 A magnified view of a section at point C;

[0023] Figure 6 This is a rear view showing the structural separation of the protective cover provided in an embodiment of this utility model.

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 1. Distribution box door; 101. Observation window; 102. Annular raised strip; 103. Sealing groove; 104. Screw hole; 105. Mounting shaft; 106. Dust cap; 107. Support plate; 2. Protective cover; 201. Bearing; 202. Groove; 203. Barrier net; 204. Sealing ring; 205. Locking plate; 206. Arc plate; 207. Pull rod; 3. Rotating rod; 301. Cover; 302. Pinch plate; 303. Threaded groove. Detailed Implementation

[0026] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0027] like Figures 1-3 , Figures 5-6 As shown, an explosion-proof distribution box includes a distribution box door 1 with an observation window 101. A rotatable protective cover 2 is provided on the outside of the observation window 101. The outer wall of the distribution box door 1 has a screw hole 104 on one side of the annular protrusion 102. One end of the protective cover 2 is provided with a rotating locking mechanism for controlling the opening and closing of the protective cover 2. The rotating locking mechanism includes: a rotating rod 3, one end of which is screwed to the screw hole 104 through a threaded groove 303, and the other end is fixedly connected to a cover 301. The cover 301 is sleeved on the outside of the rotating rod 3. A pinch plate 302 is symmetrically fixedly connected to the outer wall of the cover 301. A locking plate 205 is fixed to the end of the protective cover 2. Its edge is provided with a semi-circular through groove for the cover 301 to pass through. An arc plate 206 is fixedly connected to the side wall of the locking plate 205 for locking between the rotating rod 3 and the cover 301. A pull rod 207 is fixedly provided on the outer wall of the protective cover 2.

[0028] According to the above structure, the cover 301 is placed on the outside of the rotating rod 3, and there is an annular gap between the two. In the locked state, the arc plate 206 is embedded in this gap, which can prevent the locking plate 205 and the protective cover 2 from rotating up and down. The cover 301 is attached to the side wall of the locking plate 205 to block it laterally. The threaded groove 303 and the screw hole 104 fix the position of the cover 301, which can prevent the locking plate 205 and the protective cover 2 from being displaced to the outside or inside by impact.

[0029] Furthermore, manually rotating the pinch plate 302 drives the rotating rod 3 to rotate. The rotational motion is converted into axial displacement through the screw connection between the threaded groove 303 and the screw hole 104, causing the rotating rod 3 and the cover 301 to move outward together. After the cover 301 moves, the arc plate 206 is no longer embedded in the cover 301. At this time, the protective cover 2 is rotated upward by the pull rod 207. The semi-circular through groove of the locking plate 205 is no longer attached to the outer wall of the rotating rod 3. The protective cover 2 rotates 180° around the bearing 201 as the axis, so that it can be attached to the support plate 107. The support plate 107 supports it. At this time, the observation window 101 is fully exposed, and the internal situation of the distribution box door 1 can be observed through it.

[0030] See attached document Figures 3-4 , Figure 6 The outer wall of the distribution box door 1 has an annular raised band 102 around the observation window 101. A sealing groove 103 is formed at the top of the annular raised band 102, and its sidewalls are inclined. A mounting shaft 105 is fixed to the other side, and a dust cap 106 is movably sleeved at the end of the mounting shaft 105. A support plate 107 for supporting the protective cover 2 is provided on the edge of the outer wall of the distribution box door 1. The protective cover 2 is rotatably connected to the mounting shaft 105 via a bearing 201 at one end. A sealing ring 204 is fixedly connected to the inner periphery of the protective cover 2, and the sealing ring 204 is interference-fitted with the sealing groove 103. A groove 202 is formed inside the sealing ring 204 on the sidewall of the distribution box door 1, and a barrier net 203 is fixedly connected within the groove 202. The gap D between the protective cover 2 and the distribution box door 1 is set as follows: Where H = height of the annular raised band 102, and T = thickness of the sealing ring 204.

[0031] According to the above structure, the dust cap 106 is nested at one end of the mounting shaft 105 by friction. Its diameter is the same as that of the bearing 201. It can cover the junction of the bearing 201 and the mounting shaft 105 for dust protection. When the protective cover 2 is rotated and closed, since there is a gap between the protective cover 2 and the distribution box door 1, and an annular protrusion 102 is provided in this gap, the friction object of the sealing ring 204 can be transferred from the "outer wall of the distribution box door 1" to the "sloping surface of the annular protrusion 102". The sloping surface guide can reduce the initial contact resistance, and the sealing ring 204 only rubs against it briefly when the protective cover 2 is closed, which can significantly reduce the risk of wear.

[0032] Furthermore, after the protective cover 2 is closed, the sealing ring 204 is squeezed into the sealing groove 103, enhancing dustproof sealing. When the protective cover 2 is rotated open, the sealing ring 204 rotates and disengages from the sealing groove 103, preventing contact between the sealing ring 204 and the distribution box door 1, thus avoiding continuous friction. The protective cover 2 is made of metal materials such as stainless steel, aluminum alloy, and carbon steel as basic protection to prevent glass fragments from the observation window 101 from flying outwards during an explosion. The barrier net 203 serves as secondary protection, fitting against the outside of the observation window 101 when the protective cover 2 is closed, absorbing the impact energy of the glass and reducing the risk of glass breakage. The height H of the annular protrusion 102 is the basic value of the gap between the distribution box door 1 and the protective cover 2; the added value... Due to the interference fit, it needs to be compressed to half the thickness T of the sealing ring 204; the total clearance D is the algebraic sum of the two, ensuring that the protective cover 2 can both seal and rotate.

[0033] The working principle of this utility model is as follows: the cover 301 is placed on the outside of the rotating rod 3, and there is an annular gap between the two. In the locked state, the arc plate 206 is embedded in this gap, which can prevent the locking plate 205 and the protective cover 2 from rotating up and down. The cover 301 is attached to the side wall of the locking plate 205 to block it laterally. The threaded groove 303 and the screw hole 104 fix the position of the cover 301, which can prevent the locking plate 205 and the protective cover 2 from being displaced to the outside or inside by impact.

[0034] Furthermore, manually rotating the pinch plate 302 drives the rotating rod 3 to rotate. The rotational motion is converted into axial displacement through the screw connection between the threaded groove 303 and the screw hole 104, causing the rotating rod 3 and the cover 301 to move outward together. After the cover 301 moves, the arc plate 206 is no longer embedded in the cover 301. At this time, the protective cover 2 is rotated upward by the pull rod 207. The semi-circular through groove of the locking plate 205 is no longer attached to the outer wall of the rotating rod 3. The protective cover 2 rotates 180° around the bearing 201 as the axis, so that it can be attached to the support plate 107. The support plate 107 supports it. At this time, the observation window 101 is fully exposed, and the internal situation of the distribution box door 1 can be observed through it.

[0035] Furthermore, the dust cap 106 is nested at one end of the mounting shaft 105 by friction. Its diameter is the same as that of the bearing 201. It can cover the junction of the bearing 201 and the mounting shaft 105 for dust protection. When the protective cover 2 is rotated and closed, since there is a gap between the protective cover 2 and the distribution box door 1, and an annular protrusion 102 is provided in this gap, the friction object of the sealing ring 204 can be transferred from the "outer wall of the distribution box door 1" to the "sloping surface of the annular protrusion 102". The sloping surface guide can reduce the initial contact resistance, and the sealing ring 204 only rubs against it briefly when the protective cover 2 is closed, which can significantly reduce the risk of wear.

[0036] Furthermore, after the protective cover 2 is closed, the sealing ring 204 is squeezed into the sealing groove 103, enhancing dustproof sealing. When the protective cover 2 is rotated open, the sealing ring 204 rotates and disengages from the sealing groove 103, preventing contact between the sealing ring 204 and the distribution box door 1, thus avoiding continuous friction. The protective cover 2 is made of metal materials such as stainless steel, aluminum alloy, and carbon steel as basic protection to prevent glass fragments from the observation window 101 from flying outwards during an explosion. The barrier net 203 serves as secondary protection, fitting against the outside of the observation window 101 when the protective cover 2 is closed, absorbing the impact energy of the glass and reducing the risk of glass breakage. The height H of the annular protrusion 102 is the basic value of the gap between the distribution box door 1 and the protective cover 2; the added value... Due to the interference fit, it needs to be compressed to half the thickness T of the sealing ring 204; the total clearance D is the algebraic sum of the two, ensuring that the protective cover 2 can both seal and rotate.

[0037] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. An explosion-proof distribution box, comprising a distribution box door (1) with an observation window (101), characterized in that: The observation window (101) is provided with a rotatable protective cover (2) on the outside. The outer wall of the distribution box door (1) is provided with an annular raised band (102) around the observation window (101). The top of the annular raised band (102) is provided with a sealing groove (103), and its side wall is inclined. The protective cover (2) is provided with a rotary locking mechanism at one end, which is used to control the opening and closing of the protective cover (2); A sealing ring (204) is fixedly connected to the inner periphery of the protective cover (2), and the sealing ring (204) is interference-fitted with the sealing groove (103).

2. The explosion-proof distribution box according to claim 1, characterized in that: The outer wall of the distribution box door (1) has a screw hole (104) on one side of the annular raised strip (102) and a mounting shaft (105) fixed on the other side. The protective cover (2) is rotatably connected to the mounting shaft (105) through a bearing (201) at one end.

3. The explosion-proof distribution box according to claim 2, characterized in that: The end of the mounting shaft (105) is movably sleeved with a dust cap (106), and the outer edge of the distribution box door (1) is provided with a support plate (107) to support the protective cover (2).

4. The explosion-proof distribution box according to claim 2, characterized in that: The rotary locking mechanism includes: The rotating rod (3) has one end screwed to the screw hole (104) through the threaded groove (303), and the other end is fixedly connected to the cover (301). The cover (301) is sleeved on the outside of the rotating rod (3), and the outer wall of the cover (301) is symmetrically fixedly connected to the pinch plate (302). The locking plate (205) fixed to the end of the protective cover (2) has a semi-circular through groove on its edge for the cover cylinder (301) to pass through. The side wall of the locking plate (205) is fixedly connected to an arc plate (206) for locking between the rotating rod (3) and the cover cylinder (301).

5. The explosion-proof distribution box according to claim 1, characterized in that: The side wall of the distribution box door (1) has a groove (202) inside the sealing ring (204), and a barrier net (203) is fixedly connected inside the groove (202).

6. The explosion-proof distribution box according to claim 1, characterized in that: The gap D between the protective cover (2) and the distribution box door (1) is set as Where H = height of the annular raised band (102) and T = thickness of the sealing ring (204).

7. The explosion-proof distribution box according to claim 1, characterized in that: A pull rod (207) is fixed to the outer wall of the protective cover (2).

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