Cabinet for radioelectronic equipment

FIELD: electric engineering; radio-electronic equipment; cooling devices.

SUBSTANCE: casing of cabinet is separated by horizontal partitions into floors, on which demountable electric units with thermally loaded elements are installed. On the side wall of casing from the external side absorption-diffusion refrigerator machine is attached, which consists of evaporator, condenser, reflux cooler, absorber, generator. In interfloor partitions there are channels arranged, where evaporating sections of thermal pipes are installed. Condensation sections of thermal pipes are fixed with the help of split joints on the internal side of cabinet casing wall and are thermally connected to evaporator 6 of absorption-diffusion refrigerator machine. Evaporator is installed in heat insulated unit, which is fixed on internal side of cabinet wall with the help of split joints.

EFFECT: increase of cabinet maintainability without damage of its casing heat insulation.

6 dwg

 

The invention relates to a device for electronic equipment, in particular to devices for cooling electronic equipment (REE).

Known electronic unit with a cooling system based on gas refrigerating machines [A.S. USSR N 488046, MKI F25B 9/00, 1974]. The cooling system allows to provide heat from the elements below the temperature of the cooling medium, but it's inefficient (low efficiency gas refrigeration cycle), and the motor interfere with the operation of CEA.

Famous wardrobe for REA [A.S. USSR N 651510, MKI NC 7/20, 1979], adopted for the prototype, comprising a housing divided by horizontal partitions on the floors, which are removable electrical blocks with thermal loaded elements, and the cooling system on the basis of absorption and diffusion refrigerating machine (ADHM), including pumping thermosyphon with the heat source and the evaporator.

The source of thermal energy ADHM are fuel elements REE, such as semiconductors. Work ADHM not have a deleterious effect on the work of the CEA, and thermal coefficient of ADHM higher than the gas refrigerating machine 3...5 times.

However, the prototype has a number of disadvantages.

Installation of evaporator ADHM inside the Cabinet for CEA reduces its useful volume and requires hermetical the entrance of the evaporator in the Cabinet. In the manufacture of the evaporator should be carried out environmentally harmful operation of its galvanizing for anticorrosion coating application.

In addition, the mode of the REE is unstable, which causes unstable supply of heat to ADHM and, as a consequence, the inability to provide a stable temperature inside the Cabinet.

Object of the invention is the provision of the necessary temperature regime for the operation of the elements of the CEA, and improving the maintainability of the Cabinet for CEA in the replacement of the defective ADHM without destroying the insulation of the Cabinet.

This object is achieved due to the fact that in a Cabinet for electronic equipment, comprising a housing divided by horizontal partitions on floors, on which is placed a removable electrical blocks with thermal loaded elements, and the cooling system on the basis of absorption and diffusion refrigerating machine according to the invention in the intermediate partition provided with channels that have the evaporating sections of the heat pipes, and the condensing sections of the heat pipes secured with detachable joints on the inner side walls of the Cabinet and have thermal communication with the evaporator of the absorption-diffusion refrigerating machine, which is located in the insulated block, and the block with vapor is eat secured to the outer side walls of the Cabinet by means of detachable connections.

The presence of these detachable connections increases the maintainability of the Cabinet for CEA because it gives the opportunity to replace defective ADHM without destroying the insulation Cabinet

The location of the evaporator ADHM in special insulated block prevents heat environment, i.e. almost all produced cold is used to provide thermal regimes of REA elements.

The invention is illustrated by drawings.

Figure 1 shows a General view of a Cabinet for electronic equipment.

Figure 2 presents a case for CEA (front view) ADHM on the side.

Figure 3 shows the Cabinet for CEA (side view).

Figure 4 - evaporator ADHM in the insulated block.

Figure 5 - section a-a of the evaporator ADHM.

Figure 6 is a diagram of the mounting of the evaporator ADHM.

Cabinet for electronic equipment includes a housing 1, divided by horizontal partitions 2 tiered on 3 floors. On the floor is placed a removable electrical blocks 4. On the side wall 5 of the housing 1 is fixed by means of detachable connections ADHM containing the evaporator 6, a condenser 7, a reflux condenser 8, the absorber 9, the tank absorber 10 and the generator 11, is covered with insulating casing. In the channels of the intermediate partitions are evaporative sections 12 of the heat pipe (TT). The condensing sections of the heat pipe 13 are of vdol the side wall 5 of the Cabinet from the inside. Mount the condensing sections 13 TT to the side wall 5 of the Cabinet is in the zone 14 of the location of the evaporator ADHM. The lower floor is, the longer the condensation section 13 TT. The evaporator ADHM made in the form of three-flow heat exchanger coil shape and is located in the vertical plane. The evaporator contains 3 channels of the evaporator 15, the inner 16 (channel purified gas mixture) and the channel of liquid ammonia 17. The evaporator is completely sealed insulating block 18. The outer walls of the block is made of plastic, and the wall 19 in contact with the side wall of the Cabinet, made of vysokoteploprovodnyh material, for example aluminum. Fixing the actual evaporator 15 to the wall 19 is carried out by clamps 20. In the gap between the contacts 21 have a thermally conducting paste or compressed highly porous cellular material with high structural thermal conductivity (copper), impregnated with a conductive paste, such as CPT-8.

Consider the work of the Cabinet for REA on a concrete example. As ADHM used unit AL-160 production Vasylkivska refrigerator factory. The TT coolant - water, building TT is made of stainless steel.

When the elements of the CEA works and the source of thermal power generator ADHM. When this is implemented refrigeration CEC is and. Of the water-ammonia mixture is evaporated mainly ammonia, which flows into the reflux condenser 8, and weak (purified from ammonia) solution at the inlet of the absorber 9. In the dephlegmator 8 separates the water vapor and purified vapors of ammonia enter the condenser 7 where sigalda and flow down the channel of liquid ammonia 17 to the input of the actual evaporator 15. In the process flow is subcooled liquid ammonia. In the annular space of the evaporator, the evaporation of liquid ammonia in a gas-vapor medium (ASG) at low partial pressure of 0.9-1.0 bar). In this case, achieving a temperature of minus 27...30°). Saturated with ammonia calibration gas due to the greater density is lowered into the tank absorber 10 and then fed to the input coil of the absorber 9. In the absorber in countercurrent mode is the weak absorption of water-ammonia solution of ammonia vapors from ASG. The treated vapors from the ammonia calibration gas internal channel 16 to the input of the evaporator, and a saturated ammonia water-ammonia solution in the generator input, and the cycle repeats.

When driving purified PGS internal channel 16 is hypothermia. Hypothermia ammonia in the channel of liquid ammonia 17 and CBC in the inner channel 16 reduces the temperature level of the cooling and increase cooling capacity.

When the REA elements of vydelyaetsa thermal energy, which is transmitted into the air or directly intermediate partitions 2. In this case, the evaporating sections 12 TT is generated vapor coolant is water. Water vapor coming from the condensing sections 13 TT, where Sigulda with the exhaust heat of vaporization to the evaporator.

Due to the work of the TT in the evaporation-condensation cycle is high izotonicnosti items REA.

This ensures high performance work Cabinet for REA.

Studies [Vasiliev O., Optimization of operating modes of devices with different function from ADHM: Dis. Kida. technology. Sciences: 05.04.03. - Odessa, 1998] showed that ADHM type AL-160 provides a level of minus temperatures (18...20° (C) when thermal load on the low-temperature (initial) part of the evaporator 10...12 W, and simultaneously the temperature 0...5°when thermal load on the middle portion of the 12...14 watts.

In these tests in the gaps between the contacts 21 was compressed copper highly porous cellular material impregnated with paste KPT-8. The magnitude of the effective thermal conductivity of the gap was 8.3...8.5 W/(MK). This is especially important because they provided the contact flat surface of the wall 19 of the evaporator 15, made in the form of a tube with a diameter of 32 mm

Maintainability Cabinet on the I REE is increased by introducing into the design of detachable joints for mounting the insulated unit with evaporator ADHM on the outer side wall of the Cabinet. This allows you to replace ADHM without destroying the insulation of the Cabinet for REA.

Cabinet for electronic equipment, comprising a housing divided by horizontal partitions on floors, on which is placed a removable electrical blocks with thermal loaded elements, and the cooling system on the basis of absorption and diffusion of the refrigeration machine, characterized in that in the intermediate partition provided with channels that have the evaporating sections of the heat pipes, and the condensing sections of the heat pipes secured with detachable joints on the inner side walls of the Cabinet and have thermal communication with the evaporator of the absorption-diffusion refrigerating machine, which is sealed insulated block, and the block with the evaporator mounted on the outer side walls of the Cabinet by means of a demountable connections.



 

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