Low-voltage cabinet

Abstract

The low-voltage cabinet comprises a cabinet body, the cabinet body is provided with a front lower door and a rear lower door, the bottom of the cabinet body and the front lower door are provided with ventilation holes, the side face of the top of the cabinet body is provided with an air outlet, a heat dissipation channel communicated with the ventilation holes and the air outlet is formed in the space in the cabinet body, a partition plate is arranged in the cabinet body, and fans are correspondingly arranged at the air outlet and on the partition plate. Cold air enters from the bottom, hot air exits from the top, and the heat dissipation efficiency is improved. Bridge-shaped ventilation holes are formed in the front lower door and the bottom of the cabinet body of the low-voltage cabinet, and a fan is configured according to different current levels, so that the heat dissipation effect is further improved. According to the utility model, the copper bar consumption of the single low-voltage cabinet can be reduced by 12%, and the purposes of cost reduction and efficiency improvement are achieved.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, and in particular to a low-voltage switchgear. Background Technology

[0002] Low-voltage switchgear plays a crucial role in low-voltage power distribution systems, typically used to improve power supply reliability, flexibility, and security. However, existing low-voltage switchgear suffers from poor heat dissipation, and the high cost of copper busbars accounts for over 40% of the total cost. Therefore, it is necessary to improve heat dissipation and reduce the size of the copper busbars within the switchgear to achieve cost reduction and efficiency improvement. Utility Model Content

[0003] The technical problem to be solved by this utility model embodiment is to provide a low-voltage cabinet to improve heat dissipation.

[0004] To solve the above-mentioned technical problems, this utility model provides a low-voltage cabinet, including a cabinet body with a front lower door and a rear lower door. Ventilation holes are provided on the bottom of the cabinet body and the front lower door. An air outlet is provided on the top side of the cabinet body. The internal space of the cabinet body forms a heat dissipation channel connecting the ventilation holes and the air outlet. A partition is provided inside the cabinet body, and fans are correspondingly provided at the air outlet and on the partition.

[0005] Furthermore, the cabinet is equipped with copper busbars, which satisfy the following formula:

[0006] I 载 = K * S 0.5 *Δ θ 0.39 ;

[0007] in, I 载 For copper busbar current carrying capacity, K The material coefficient of the copper busbar. S Where is the cross-sectional area of ​​the copper busbar, and Δθ is the allowable temperature rise, Δθ≤70K.

[0008] Furthermore, the power of the fan P fan With the rated current of the low-voltage switchgear I 额 Satisfy the following formula:

[0009] ;

[0010] in, R Q is the total resistance of the copper busbar and its connection points. natural Natural heat dissipation η The fan cooling efficiency is given by Δθ, which is the allowable temperature rise, and Δθ ≤ 70K.

[0011] Furthermore, the ventilation hole is a bridge-shaped ventilation hole.

[0012] Furthermore, the fan inside the cabinet is detachable, and the fan is connected to the power supply using male and female plug-in terminals.

[0013] Furthermore, a temperature controller is installed inside the cabinet.

[0014] The beneficial effects of this invention are as follows: Cold air enters from the bottom and hot air exits from the top, improving heat dissipation efficiency. The low-voltage switchgear has bridge-shaped ventilation holes on the lower front door and bottom of the cabinet, and fans are configured according to different current ratings, further enhancing heat dissipation. The copper busbar usage of a single low-voltage switchgear can be reduced by 12%, achieving the goal of cost reduction and efficiency improvement. Attached Figure Description

[0015] Figure 1 This is a structural diagram of a low-voltage switchgear according to one embodiment of the present invention.

[0016] Figure 2 This is a structural diagram of a low-voltage switchgear according to another embodiment of the present invention.

[0017] Explanation of icon numbers

[0018] Cabinet 1, front bottom door 2, rear bottom door 3, fan 4, partition 5. Detailed Implementation

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] In this embodiment of the invention, directional indicators (such as up, down, left, right, front, back, etc.) are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0022] Please refer to Figures 1-2 The low-voltage switchgear of this embodiment includes a cabinet. The low-voltage switchgear of this embodiment is a low-voltage incoming line switchgear or a busbar switchgear.

[0023] The cabinet features a front bottom door and a rear bottom door, with ventilation holes at the bottom and on the front bottom door. An air outlet is located on the top side of the cabinet, and the internal space forms a heat dissipation channel connecting the ventilation holes and the air outlet. Cool air enters from the bottom and hot air exits from the top, improving heat dissipation efficiency.

[0024] The cabinet contains shelves, with fans installed at the air outlets and on the shelves. The shelves have perforated sections. The fans further enhance heat dissipation efficiency.

[0025] As one implementation method, a copper busbar is provided inside the cabinet, and the copper busbar satisfies the following formula:

[0026] I 载 = K * S 0.5 *Δ θ 0.39 ;

[0027] in, I 载 This represents the current carrying capacity of the copper busbar, expressed in amperes (A). K The material coefficient for the copper busbar is 0.018~0.022 for bare copper and 0.016~0.020 for tin-plated copper. S The cross-sectional area of ​​the copper busbar is in mm². Δθ is the allowable temperature rise (K), Δθ≤70K.

[0028] According to this formula, the copper busbar specifications should be selected as shown in Table 1 for specific applications:

[0029]

[0030] This utility model calculates the current based on the transformer capacity of the user's project, and combines the current on the load side and the current carrying capacity of the copper busbar. Under the condition of temperature rise ≤70K, it reduces the specifications of the copper busbar in the cabinet, thereby achieving the goal of cost reduction and efficiency improvement.

[0031] As one implementation method, the power of the fan P fan With the rated current of the low-voltage switchgear I 额 (e.g., 1000A, 2000A) satisfy the following formula:

[0032] ;

[0033] in, R Q is the total resistance (Ω) of the copper busbar and its connection points. natural Natural heat dissipation (W). η Δθ represents the fan's heat dissipation efficiency (typically 30%~50%), Δθ represents the allowable temperature rise (e.g., 30K~70K), and Δθ≤70K.

[0034] Example: A 2000A incoming line cabinet (copper busbars 2×100×10, heat output 4500W), of which natural heat dissipation capacity is approximately 800W (cabinet ventilation holes + exhaust vents); therefore, the required forced heat dissipation is: 4500−800=3700W. W The required air volume is calculated (ΔT=15K): That is, 720m 3 If the output is / h, then you can choose two 50W units.

[0035] This invention configures the fan according to different current levels, which improves heat dissipation efficiency while also reducing costs and increasing efficiency.

[0036] In one embodiment, the ventilation hole is a bridge-shaped ventilation hole.

[0037] As one implementation method, the fan inside the cabinet is detachable, and the fan is connected to the power supply using male and female plug-in terminals to facilitate replacement of the fan inside the cabinet while it is powered on.

[0038] As one implementation method, a thermostat is installed inside the cabinet. This invention adjusts the fan in real time based on the thermostat's detection results.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-voltage switchgear, comprising a cabinet body, characterized in that, The cabinet has a front bottom door and a rear bottom door. Ventilation holes are provided at the bottom of the cabinet and on the front bottom door. An air outlet is provided on the top side of the cabinet. The internal space of the cabinet forms a heat dissipation channel connecting the ventilation holes and the air outlet. The cabinet has partitions, and fans are provided at the air outlets and on the partitions.

2. The low-voltage switchgear as described in claim 1, characterized in that, The cabinet is equipped with copper busbars, which satisfy the following formula: I 载 = K * S 0.5 *D θ 0.39 ; in, I 载 For copper busbar current carrying capacity, K The material coefficient of the copper busbar. S Where is the cross-sectional area of ​​the copper busbar, and Δθ is the allowable temperature rise, Δθ≤70K.

3. The low-voltage switchgear as described in claim 1, characterized in that, The power of the fan P fan With the rated current of the low-voltage switchgear I 额 Satisfy the following formula: ； in, R Q is the total resistance of the copper busbar and its connection points. natural Natural heat dissipation η The fan cooling efficiency is given by Δθ, which is the allowable temperature rise, and Δθ ≤ 70K.

4. The low-voltage switchgear as described in claim 1, characterized in that, The ventilation holes are bridge-shaped ventilation holes.

5. The low-voltage switchgear as described in claim 1, characterized in that, The fan inside the cabinet is detachable, and the fan is connected to the power supply using male and female plug-in terminals.

6. The low-voltage switchgear as described in claim 1, characterized in that, The cabinet is equipped with a thermostat.

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