CN214068471U - Passive passive heat dissipation load cabinet - Google Patents

Abstract

The utility model relates to a passive heat dissipation load cabinet, including rack and corrugated resistor, corrugated resistor's power is 2.5kW, the material is the alloy resistance wire, the size of rack sets up to wide long high 648mm 850mm 1245mm, corrugated resistor is 5 layers in the rack, 4 parallel arrangement on every layer, every adjacent two corrugated resistor in layer is 200mm at the center interval of horizontal direction, every adjacent two corrugated resistor in line is 200mm at the center interval of vertical direction, link to each other through the copper bar between each corrugated resistor in line of each layer. The utility model discloses can realize effectual passive heat dissipation, solve the electromagnetic interference and the defect of fan noise of active heat dissipation load cabinet.

Description

Passive passive heat dissipation load cabinet

Technical Field

The utility model relates to a heat dissipation technical field especially relates to a passive heat dissipation load cabinet.

Background

In the military industry or special industrial field, there is a demand for ultra-large ac power equipment. For example, in an underwater acoustic signal transmission system, an ultra-high power amplifier is required to drive a sensor to generate sound, and the signal transmission power needs to be detected regularly in order to ensure that the signal transmission power is normal. The mainstream super-power load cabinets on the market at present all comprise a cabinet body, a resistor, a fan and other components, and are active equipment, wherein the fan can emit large noise during normal work, and serious electromagnetic interference exists on other surrounding equipment, so that the super-power load cabinets cannot be used in an environment highly sensitive to EMC (electromagnetic compatibility), such as a military laboratory, and cannot be mixed with military equipment.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Based on the problem, the utility model provides a passive heat dissipation load cabinet, it is when reaching radiating purpose, effectively reduces electromagnetic interference and wind speed or fan noise, is applicable to fields such as the highly sensitive military project of EMC or special industry.

(II) technical scheme

Based on foretell technical problem, the utility model provides a passive heat dissipation load cabinet, including rack and corrugated resistor, corrugated resistor is in A layer, every layer B parallel are put in the rack, link to each other through the copper bar between each layer corrugated resistor who lists, and the rack is outer to have the terminal interface that is used for connecting the power, and A >1, B > 1.

Furthermore, the power of the corrugated resistor is 2.5kW, and the material is alloy resistance wire.

Further, the size of the cabinet, i.e., width × length × height, is set to 648mm × 850mm × 1245 mm.

Further, the corrugated resistors are arranged in 5 layers in the cabinet, and each layer is arranged in parallel with 4 layers.

Further, the distance between the centers of two adjacent corrugated resistors in each layer in the horizontal direction is 200mm, and the distance between the centers of two adjacent corrugated resistors in each column in the vertical direction is 200 mm.

Furthermore, six faces of the cabinet are all hollowed-out cover plates.

Furthermore, a non-hollow cover plate is arranged above the hollow cover plate at the top.

Furthermore, a hanging ring is arranged above the hollow-out-free cover plate.

Further, the bottom of the cabinet is provided with universal wheels.

(III) advantageous effects

The above technical scheme of the utility model passive heat dissipation load cabinet has, its following advantage:

through the passive heat dissipation load cabinet, the 2 serious defects of the EMC standard exceeding and the fan noise of the active load cabinet can be effectively shielded, the utility model discloses combine resistor surface temperature rise curve and derating curve, and the physical characteristics of its material, confirm the safe critical air temperature in the load cabinet, thereby according to the equipment power size and the continuous operating time length of awaiting measuring, design the cabinet volume size, rationally arrange the resistor spatial position, make the cabinet whole can effectively dispel the heat naturally, because no longer need the fan, the defect of electromagnetic interference and the fan noise of active load cabinet has been solved; the hollow cover plate also increases the air circulation efficiency, ensures that the highest air temperature in the cabinet is lower than the critical temperature, leaves more than 20 percent of allowance, has low cost and is suitable for a high-power amplifier cabinet.

Drawings

The features and advantages of the invention will be more clearly understood by reference to the accompanying drawings, which are schematic and should not be understood as imposing any limitation on the invention, in which:

fig. 1 is a three-view diagram of a load cabinet according to an embodiment of the present invention;

fig. 2 is a derating curve of the load cabinet according to the embodiment of the present invention;

fig. 3 is a surface temperature rise curve of the load cabinet according to the embodiment of the present invention;

fig. 4 is a schematic structural diagram of a corrugated resistor according to an embodiment of the present invention;

fig. 5 is a table of specification and dimensions of a corrugated resistor according to an embodiment of the present invention;

in the figure: 1: a ripple resistor; 2: a cabinet; 21: hollowing out the cover plate; 22: no hollow cover plate is arranged; 3: a hoisting ring; 4: a universal wheel; 5: a binding post interface; 6: and (5) warning identification.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

The utility model relates to a passive heat dissipation load cabinet, like the three-view shown in fig. 1, the upper left is the elevation view, the upper right is the left side view, the lower left is the plan view, including rack 2 and corrugated resistor 1, corrugated resistor 1's power is 2.5kW, the material is the alloy resistance wire, rack 2's size sets up to 648mm (width) x 850mm (length) x 1245mm (height), corrugated resistor 1 is 5 layers in rack 2, 4 parallel placements per layer, the centre spacing of two adjacent corrugated resistor 1 in the horizontal direction of each layer is 200mm, the centre spacing of two adjacent corrugated resistor 1 in the vertical direction of each row is 200mm, link to each other through the copper bar between the corrugated resistor 1 of each row of each layer to endure high temperature environment; six faces of the cabinet 2 are all hollow cover plates 21, a non-hollow cover plate 22 is additionally arranged above the hollow cover plate 21 at the top to prevent foreign matters from falling off, meanwhile, a hanging ring 3 is arranged above the non-hollow cover plate 22 to facilitate hoisting, and universal wheels 4 are assembled at the bottom to facilitate movement; a binding post interface 5 is arranged at one side outside the cabinet 2 and used for being connected with a power supply, and a warning mark 6 with high temperature and high pressure is pasted on the cabinet 2. The passive heat dissipation load cabinet can realize natural heat dissipation by reasonably designing the intervals of the corrugated resistors, and the reasonable design is determined according to the working mode of the load cabinet. A load cabinet commonly used in the field of underwater acoustic communication has a rated power of 10kW, generally works for 5 minutes, has a rest for 10 minutes and continuously works for 8 hours.

The abscissa of the derating curve of fig. 2 is the ambient temperature, and the ordinate is the rated power consumption ratio, and it can be seen from fig. 2 that when the air temperature in the load cabinet reaches 225 ℃, the power of the resistor approaches to 0W instantly, because the temperature rises and the resistance value of the resistor reaches infinity instantly, the power of the resistor approaches to 0W, and in order to ensure the normal operation of the resistor, the critical temperature of the air in the cabinet is selected to be 150 ℃, and a margin of 75 ℃ is left; in the high-temperature and relatively closed environment of the load cabinet, the resistance works for more than 20 minutes continuously, the load factor of the resistance is generally designed to be 40%, and the limit is 50%. The working mode of the load cabinet is 5 minutes of working, 10 minutes of resting and 8 hours of continuous working. The load cabinet can not continuously generate heat, the load rate of the resistor is 40%, and certain redundancy is realized with the working mode. The utility model discloses consider the requirement of military project product reliability, its MTBF requires more than or equal to 2000h, further designs the resistance load rate for 20%, and the load rate redundancy improves one time. The abscissa of the temperature rise curve of fig. 3 is the load factor, the ordinate is the resistance surface temperature, for a load factor of 20%, the resistance surface temperature is 250 ℃;

and calculating the volume of the load cabinet and the space interval of the resistors by thermal simulation software according to the overall dimension and material of the resistors, the external environment temperature of the cabinet and the critical temperature of the air in the cabinet, wherein the use environment of the load cabinet is indoor, and when the indoor ventilation environment is good, the indoor temperature is usually 25 ℃, so that the external environment temperature of the cabinet is 25 ℃, and the dimension of the corrugated resistor is shown in fig. 4 and 5. Therefore, the sizes are reasonably designed according to the working mode, and the space layout with any size does not have the function of passive heat dissipation.

Verify the utility model discloses the technological effect of scheme detects the heat distribution of load cabinet, can discover that resistance surface temperature has 229.994 ℃, 230.29 ℃, 231.336 ℃, 224.731 ℃, 224.449 ℃ etc. and resistance surface highest temperature is no longer than 234 ℃, satisfies the critical temperature requirement of air in the cabinet. The air temperature around the resistor is 63.2216 ℃, 69.3933 ℃, 62.4628 ℃, 63.8392 ℃, 70.3914 ℃, 71.1559 ℃, 63.6637 ℃ and the like, and the air temperature around the resistor does not exceed 113 ℃ and is far less than the limit temperature value 225 ℃ defined by a resistor manufacturer. Consequently, verified the utility model discloses a load cabinet can effectively realize passive heat dissipation in the in-service work.

To sum up, through the passive heat dissipation load cabinet of the aforesaid, can effectively shield the 2 serious defects that EMC of the active load cabinet exceeds standard and fan noise, the utility model discloses combine resistor surface temperature rise curve and derating curve, and the physical characteristics of its material, confirm the critical air temperature of safety in the load cabinet, thus according to the equipment power size and the continuous operating time length of awaiting measuring, design the rack volume size, rationally layout resistor spatial position, make the whole cabinet can effectively dispel the heat naturally, because no longer need the fan, solved the electromagnetic interference of active load cabinet and the defect of fan or wind speed noise; the hollow cover plate also increases the air circulation efficiency, ensures that the highest air temperature in the cabinet is lower than the critical temperature, leaves more than 20 percent of allowance, has low cost and is suitable for a high-power amplifier cabinet.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims (9)

1. The passive and passive heat dissipation load cabinet is characterized by comprising a cabinet and corrugated resistors, wherein the corrugated resistors are arranged in the cabinet in an A layer and B layers in parallel, the corrugated resistors in each layer are connected through copper bars, a wiring terminal interface for connecting a power supply is arranged outside the cabinet, and A is greater than 1 and B is greater than 1.

2. The passive and passive heat dissipation load cabinet of claim 1, wherein the ripple resistor has a power of 2.5kW and is made of an alloy resistance wire.

3. A passive, heat sinking load cabinet according to claim 2, wherein the cabinet is dimensioned to be 648mm x 850mm x 1245mm wide x long x tall.

4. A passive, heat dissipating load cabinet according to claim 3, wherein the corrugated resistors are arranged in parallel in 5 layers, 4 layers each, within the cabinet.

5. A passive and passive heat dissipation load cabinet according to claim 4, wherein the distance between the centers of two adjacent corrugated resistors in each layer in the horizontal direction is 200mm, and the distance between the centers of two adjacent corrugated resistors in each column in the vertical direction is 200 mm.

6. The passive and passive heat dissipating load cabinet of claim 1, wherein six sides of the cabinet are all hollowed-out cover plates.

7. The passive and passive heat dissipation load cabinet of claim 6, wherein a non-hollowed-out cover plate is further disposed above the hollowed-out cover plate at the top.

8. The passive and passive heat dissipating load cabinet of claim 7, wherein a hanging ring is disposed above the non-hollowed-out cover plate.

9. The passive, heat dissipating load cabinet of claim 1, wherein the bottom of the cabinet is gimbaled.

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