Ventilation device for switch cabinet

Abstract

A ventilation device for a switch cabinet belongs to the technical field of low-voltage electric appliance accessories. Comprising a ventilation mechanism, the ventilation mechanism comprises a vertically-through ventilation frame, the ventilation frame is arranged at the top of the switch cabinet in the using state, an opening in the bottom of the ventilation frame is communicated with a cabinet cavity of the switch cabinet, the upper portion of the ventilation frame is provided with a top cover in a covering mode, and the top cover seals the opening in the top of the ventilation frame. The ventilation frame is defined by a plurality of side walls, a ventilation frame cavity is formed in the ventilation frame, at least one side wall is provided with heat dissipation holes communicated with the outside and the ventilation frame cavity, the ventilation mechanism further comprises a flow guide part fixedly arranged below the top cover, the flow guide part extends towards the ventilation frame cavity from bottom to top to form a guide inclined face, and the guide inclined face is provided with a guide hole. And the guide inclined surface is used for guiding hot air to flow towards the heat dissipation holes in at least one side wall. The switch cabinet has the advantages that hot air in the cabinet can quickly flow out from the heat dissipation holes, so that the switch cabinet has a good heat dissipation effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliance accessories, and in particular relates to a ventilation device for a switch cabinet. Background Art

[0002] The new generation of low-voltage complete switchgear is widely used in power distribution and control centers in major power plants, rail transit, national power grids, data centers and other high-tech fields, and is an important part of the power system. A large amount of heat will be generated during the operation of low-voltage cabinets. At present, due to the continuous increase in transformer capacity in switchgear projects, the bus current is also increasing. The greater the current, the more heat there is. If the temperature inside the cabinet is too high, the current carrying capacity of the current-carrying components in the cabinet will decrease, thereby greatly reducing the service life of the cabinet switchgear and the reliability of operation, which is extremely unfavorable to power safety. Due to the large differences in the use environment, different switchgears also have different requirements for heat dissipation.

[0003] At present, heat dissipation holes are generally opened on the surface of low-voltage complete switch cabinets for efficient heat exchange with the environment inside the cabinet to achieve the effect of ventilation and heat dissipation. The cold air entering the cabinet from the air inlet will form hot air after passing through the heating components and copper busbars in the cabinet. Since hot air is lighter, it will be emitted to the top of the cabinet after exchange. Figure 1 As shown, it is difficult to quickly guide the top cover 12 of the existing switch cabinet because hot air will be retained in the top cover 12, forming an internal circulation of hot air, which will cause the internal temperature of the switch cabinet to increase, thereby affecting the service life of the switch cabinet and its internal components.

[0004] In view of the above-mentioned prior art, it is necessary to improve the ventilation structure of the existing switch cabinet. To this end, the applicant has made a useful design. The technical solution to be introduced below is produced in this context. Utility Model Content

[0005] The utility model aims to provide a ventilation device for a switch cabinet, which can quickly discharge hot air in the cabinet and improve the heat dissipation effect of the switch cabinet.

[0006] The objective of the utility model is achieved in this way. A ventilation device for a switch cabinet comprises a ventilation mechanism, the ventilation mechanism comprises a ventilation frame which passes through from top to bottom, the ventilation frame is arranged on the top of the switch cabinet when in use, and the opening at the bottom is communicated with the cabinet cavity of the switch cabinet, the upper cover of the ventilation frame is provided with a top cover, the top cover closes the opening at the top of the ventilation frame, the ventilation frame is composed of a plurality of side walls and a ventilation frame cavity is formed inside, at least one side wall is provided with a heat dissipation hole which connects the outside and the ventilation frame cavity, the ventilation mechanism also comprises a guide part which is fixedly arranged under the top cover, the guide part extends from bottom to top toward the ventilation frame cavity to form a guide slope, the guide slope is used to guide hot air to flow in the direction of the heat dissipation hole on at least one side wall.

[0007] In a specific embodiment of the present utility model, the diversion part includes a first diversion plate, and the first diversion plate is arranged below the top cover in an inclined state, and the lower surface of the first diversion plate constitutes the guiding inclined surface.

[0008] In another specific embodiment of the present utility model, one end of the first diversion plate is fixed to the bottom of the top cover near one side wall, and the other end extends downward toward the opposite side wall until it is fixed to the opposite side wall.

[0009] In still another specific embodiment of the present utility model, the diversion part includes a first diversion plate and a second diversion plate, and the first diversion plate and the second diversion plate are connected to form a V-shaped member, which are jointly arranged below the top cover, and the lower surfaces of the first diversion plate and the second diversion plate jointly constitute the guiding inclined surface.

[0010] In yet another specific embodiment of the present utility model, one end of the first diversion plate is fixed to the bottom of the top cover near one side wall, and the other end extends downward and obliquely toward the opposite side wall and is connected to one end of the second diversion plate, and the other end of the second diversion plate extends upward obliquely and is fixed to the bottom of the top cover near the opposite side wall.

[0011] In still another specific embodiment of the present utility model, the ventilation frame is a rectangular frame body surrounded by four side walls, namely, a front side wall, a rear side wall, a left side wall, and a right side wall.

[0012] In a further specific embodiment of the present utility model, the heat dissipation holes are arranged in the middle area in the height direction of the side wall and are arranged at intervals.

[0013] In an even further specific embodiment of the present utility model, the heat dissipation holes are rectangular holes extending longitudinally.

[0014] In yet a further specific embodiment of the present utility model, a waterproof filter screen is further included, and the waterproof filter screen is arranged inside the heat dissipation holes.

[0015] In an even yet further specific embodiment of the present utility model, the included angle between the guiding inclined surface and the top cover is 15 to 20°.

[0016] Due to the adoption of the above structure, compared with the prior art, the present utility model has the beneficial effects that: a diversion plate is added below the top cover, so that the hot air in the top cover can flow toward the heat dissipation holes on at least one side wall. The hot air encounters very little resistance and will not accumulate in the cabinet, and can quickly flow out from the heat dissipation holes, enabling the switch cabinet to have a good heat dissipation effect. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the top cover of an existing switch cabinet;

[0018] Figure 2 It is a schematic structural diagram of the overall structure of the present utility model;

[0019] Figure 3 It is a schematic structural diagram of the ventilation frame described in the present utility model;

[0020] Figure 4 It is an installation schematic diagram of the waterproof filter screen described in the present utility model.

[0021] In the figure: 1. Ventilation mechanism, 11. Ventilation frame, 111. Side wall, 112. Heat dissipation hole, 113. Ventilation frame cavity, 12. Top cover; 2. Deflector, 21. First deflector part, 22. Second deflector part; 3. Waterproof filter screen. Specific embodiments

[0022] The following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings. However, the description of the embodiments is not a limitation of the technical solution. Any change in form rather than substance based on the concept of the present utility model should be regarded as the protection scope of the present utility model.

[0023] In the following description, any concepts related to the directions (or orientations) of up, down, left, right, front, and back are with respect to the position state of the figure being described. The purpose is to facilitate public understanding, and thus it cannot be understood as a special limitation of the technical solution provided by the present utility model. Embodiment 1

[0024] Please refer to Figure 2 , the present utility model relates to a ventilation device for a switch cabinet, including a ventilation mechanism 1. The ventilation mechanism 1 includes a ventilation frame 11 that is vertically penetrated. The ventilation frame 11 is arranged on the top of the switch cabinet in the use state, and the open end at the bottom of the ventilation mechanism 1 communicates with the cabinet cavity of the switch cabinet. The upper part of the ventilation frame 11 is covered with a top cover 12, and the top cover 12 closes the open end at the upper part of the ventilation frame 11.

[0025] See Figure 3 , the ventilation frame 11 is a rectangular structure surrounded by four side walls 111 on the front, back, left, and right. In this embodiment, the ventilation frame 11 is composed of four square side walls 111 to form a cube structure. The four side walls 111 on the front, back, left, and right are sequentially connected end to end to form four right angles and are preferably fixed to each other by welding or other similar methods such as using fasteners. Of course, the overall structure of the ventilation frame 11 can also be obtained by stamping.

[0026] See Figure 3 And Figure 4, Further, at least one of the side walls 111 is provided with heat dissipation holes 112, and the heat dissipation holes 112 are arranged in the middle region in the height direction of the side wall 111 and are arranged at intervals. The heat dissipation holes 112 communicate the ventilation frame cavity 113 of the ventilation frame 11 with the outside. In this embodiment, the heat dissipation holes 112 on the four side walls 111 are rectangular holes extending longitudinally, and the size is preferably 7 mm in width and 42 mm in height. If the IP40 protection level required by the standard does not need to be met, a filter screen 3 with a pore diameter less than 1 mm can be provided on the side of the side wall 111 facing the ventilation frame cavity 113. Here, the filter screen 3 is preferably a stainless steel waterproof filter screen.

[0027] Continue to see Figure 2 , In order to enable hot air to be discharged from the switch cabinet more quickly, a diversion part 2 is provided below the top cover 12 of the present solution. The diversion part 2 extends upward from the bottom toward the ventilation frame cavity 113 to form a guiding inclined surface, and this guiding inclined surface is used to guide hot air to flow toward the heat dissipation holes 112 on at least one side wall 111.

[0028] The diversion part 2 includes a first diversion plate 21, and the first diversion plate 21 is arranged below the top cover 12 in an inclined state. Specifically, one end of the first diversion plate 21 is fixed to the bottom of the top cover 12 near one side wall 111, and the other end extends downward toward the opposite side wall 111 until it is fixed to the opposite side wall 111. The lower surface of the first diversion plate 21 constitutes the guiding inclined surface, and the included angle between this guiding inclined surface and the top cover 12 is preferably 15 to 20°, and 15° is adopted in this embodiment.

[0029] Further, the edge of the diversion part 2 is flush with the upper edge of the uppermost heat dissipation hole 112. After the hot air reaches the diversion part 2, it moves along the diversion part 2 toward the heat dissipation hole 112 and quickly flows out from the heat dissipation hole 112. The resistance to hot air in this structure is very small and will not accumulate in the cabinet, so that the temperature inside the switch cabinet can be reduced, and the service life of the switch cabinet and the internal components can be extended. Embodiment 2

[0030] The described flow guiding part 2 includes a first flow guiding plate 21 and a second flow guiding plate 22. The first flow guiding plate 21 and the second flow guiding plate 22 are arranged in a mirror image, and the two are connected to form a V-shaped part, which is jointly arranged below the top cover 12. The lower surfaces of the first flow guiding plate 21 and the second flow guiding plate 22 together constitute the guiding inclined surface. Specifically, one end of the first flow guiding plate 21 is fixed to the bottom of the top cover 12 near one side wall 111, and the other end faces the opposite side wall 111 and extends downward and obliquely to be connected to one end of the second flow guiding plate 22. The other end of the second flow guiding plate 22 extends upward and is fixed to the bottom of the top cover 12 near the opposite side wall 111. The first flow guiding plate 21 and the second flow guiding plate 22 are used to guide hot air to the two side walls 111 arranged face to face and discharge it from the heat dissipation holes 112 in two directions.

[0031] Of course, the flow guiding part 2 may further include a third flow guiding plate and / or a fourth flow guiding plate. At this time, the first flow guiding plate 21, the second flow guiding plate 22, the third flow guiding plate, and the fourth flow guiding plate form a tetrahedron and respectively correspond to the four side walls 111. In this way, hot air can be discharged from the heat dissipation holes 112 in four directions, accelerating the cooling of the switch cabinet.

Claims

1. A ventilation device for a switch cabinet, comprising a ventilation mechanism (1). The ventilation mechanism (1) includes a ventilation frame (11) that is vertically penetrated. The ventilation frame (11) is arranged on the top of the switch cabinet in the use state, and the open bottom communicates with the cabinet cavity of the switch cabinet. The upper part of the ventilation frame (11) is covered with a top cover (12), and the top cover (12) closes the open top of the ventilation frame (11). The ventilation frame (11) is formed by enclosing a plurality of side walls (111) and has a ventilation frame cavity (113) formed inside. At least one side wall (111) is provided with heat dissipation holes (112) that communicate the outside and the ventilation frame cavity (113). It is characterized in that: The ventilation mechanism (1) further includes a diversion part (2) fixedly arranged below the top cover (12). The diversion part (2) extends upward toward the ventilation frame cavity (113) to form a guiding inclined surface, which is used to guide the hot air to flow toward the heat dissipation holes (112) on at least one side wall (111).

2. The ventilation device for a switch cabinet according to claim 1, characterized in that: The diversion part (2) includes a first diversion plate (21). The first diversion plate (21) is arranged below the top cover (12) in an inclined state, and the lower surface of the first diversion plate (21) constitutes the guiding inclined surface.

3. The ventilation device for switchgear according to claim 2, characterized in that: One end of the first diversion plate (21) is fixed to the bottom of the top cover (12) near one side wall (111), and the other end extends downward toward the opposite side wall (111) until it is fixed to the opposite side wall (111).

4. The ventilation device for switchgear according to claim 1, characterized in that: The diversion part (2) includes a first diversion plate (21) and a second diversion plate (22). The first diversion plate (21) and the second diversion plate (22) are connected to form a V-shaped member, and are jointly arranged below the top cover (12). The lower surfaces of the first diversion plate (21) and the second diversion plate (22) jointly constitute the guiding inclined surface.

5. The ventilation device for a switch cabinet according to claim 4, characterized in that: One end of the first diversion plate (21) is fixed to the bottom of the top cover (12) near one side wall (111), and the other end extends downward and obliquely toward the opposite side wall (111) and is connected to one end of the second diversion plate (22). The other end of the second diversion plate (22) extends upward obliquely and is fixed to the bottom of the top cover (12) near the opposite side wall (111).

6. The ventilation device for a switch cabinet according to claim 1, characterized in that: The ventilation frame (11) is a rectangular frame body surrounded by four side walls (111) on the front, back, left and right.

7. The ventilation device for a switch cabinet according to claim 1, wherein: The heat dissipation holes (112) are arranged in the middle area in the height direction of the side wall (111) and are arranged at intervals.

8. The ventilation device for switchgear according to claim 7, characterized in that: The heat dissipation holes (112) are rectangular holes extending longitudinally.

9. The ventilation device for switchgear according to claim 1, characterized in that: It further includes a waterproof filter screen (3), and the waterproof filter screen (3) is arranged inside the heat dissipation holes (112).

10. A ventilation device for a switch cabinet according to claim 7, characterized in that: The included angle between the guiding inclined surface and the top cover (12) is 15-20°.

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