Heat exchange unit

FIELD: heating.

SUBSTANCE: heat exchange unit consisting of air and water heat exchangers tightened with screws, between which there installed in thermal contact are thermoelectric coolers located in the form of a rectangle and enveloped with a safety barrier; in addition, it is equipped with a terminal box that is located on the outer side of the water heat exchanger and connected to a cavity in which thermoelectric coolers and temperature sensors are located by means of passages made in the wall of the water heat exchanger. In the above passages there located are electrical wires of coolers and sensors, the outputs of which are fixed on the terminal plate installed in the terminal box, to which a cable for external connections is connected through a packing seal.

EFFECT: increasing air tightness of the structure, improving reliability and service life, increasing control efficiency due to possible variation of current-carrying circuits of coolers.

4 cl, 3 dwg

 

The invention relates to refrigeration equipment, namely, thermoelectric cooling plants, and can be used, for example, for cooling air in the food pantries on vessels in harsh environments, and air conditioning equipment.

The principle of operation of the heat exchange device (thermoelectric module (TEM) is based on the Peltier effect, when passing a constant current through the contact of two dissimilar metals (semiconductors), consists of TEM, one of the contacts is cooling (absorption of heat), and the other heat.

The level of technology

Known thermoelectric heat exchange device consisting of air, hydraulic heat exchangers, between which is in thermal contact with two or more thermoelectric coolers, forming a flat layer, the latter being surrounded by a perimeter protective barrier from nizkoteploprovodnye material, and the heat exchangers between a tightened screws - EN 2187052 F25B 21/02, 14.12.2000, EN 2092753 F25B 21/02, 13.06.1996, EN 2364803 F25B 21/02, 18.09.2007, EN 2397074 B60H 1/32, 01.09.2008, EN 2234647 F25B 21/02, 27.11.2002.

As the closest analogue (prototype) selected thermoelectric refrigeration unit EN 2092753 F25B 21/02, 13.06.1996. The block contains two or more thermoelectric coolers, hot and cold junctions to the verge installed radiators. The space between the radiator and the space between the hot and cold junctions filled with moisture-proof insulating material, the heat sink the hot junctions made in the form of Autonomous sections, mounted on only one thermoelectric cooler, the radiator and fan for ventilation are placed in the casing, having the form of a cone with a narrowing in the direction of the radiator. Openings for entry and exit of air is made on the opposite end sides of the casing.

The disadvantages of the prototype can be attributed to the low reliability of the device, as it partially solved the problem of tightness of the structure, leading to low level of protection of thermoelectric coolers and conductor circuits from condensation.

This is because the protecting layer of heat-insulating material around and/or between thermoelectric coolers is designed, primarily, to reduce the heat leakage to the surface to be cooled heat exchanger that does not guarantee protection of thermoelectric coolers and placed near them different kinds of temperature sensors from moisture (condensate). Does not resolve the issue and use as insulation expanded onto materials (polyurethane foam), as the foaming process in a narrow or zatesnennye spaces causes technological difficult the tee. Even more are not sealing correctly fence of solid foam materials, such as foams.

An urgent problem is to protect from condensation of current-carrying circuits and thermoelectric coolers, because the water in them for long (1000 hours or more) work contributes to the electrochemical corrosion with subsequent destruction. The reduction in the reliability of the electrical insulation of the circuit relative to the housing is unacceptable, especially for marine cooling devices are powered directly from the ship's DC network, in which the decrease in the value of the resistance of the insulation is tantamount to failure.

The problem to which the invention is directed, is to create a new robust design of heat-exchange devices operating in harsh environments on ships.

The technical result of the invention is to improve the tightness of the design, increased reliability, increased service life, increase management efficiency, due to the possibility of variation of the switching current-carrying circuits coolers.

Disclosure of inventions

The task is solved as follows. Heat exchanger consists of tightened screws air and water heat exchangers, between which is in thermal contact established thermoelectric Oh editeli, located in the form of a rectangle and surrounded by a protective barrier. The device differs in that it is additionally equipped with a terminal box, which is located on the outer side of the water heat exchanger and is connected with a cavity in which are thermoelectric coolers and temperature sensors, through channels made in the wall of the water heat exchanger, while in the above-mentioned channels are electrical wires coolers and sensors whose outputs are mounted on the terminal Board installed in the terminal box, in which through the gland seal summed cable for external connections. Terminal box is further provided with a desiccant, such as silica gel.

In addition, a protective barrier device is formed of two strands of square section, which is installed with a gap relative to each other, with one of the harnesses is located on the air heat exchanger, the other on the water, and on the outer side surfaces of the barrier coated the silicone sealant.

The implementation of the invention

The invention is illustrated by drawings. In Fig.1 shows the device in section, Fig.2 - section a-a of Fig.1, in Fig.3 - node connection fin air heat exchanger.

Heat exchanger contains air t is ployment 1 and the water heat exchanger 2, between which is placed a flat, rectangular layer of thermoelectric coolers 3 and temperature sensors 4. The heat exchangers 1 and 2 are drawn along the contour of the screws 5. The force of the coupler is locked to the lugs 6, which are installed between the heat exchangers on the perimeter and in the center. The screws 5 to transmit power to the heat exchanger 2 through metaloproteinase thrust bearing 7. The channels 8 in the wall of the heat exchanger 2 connect the cavity occupied by thermoelectric coolers 3, with the terminal box 9, located on the external side of the heat exchanger 2. On the box set cover 10, which is fixed by screws with seals (not shown). In the box 9 is made stuffing enter 11 for installation of the cable external connections. The wires from thermochemically and temperature sensors soldered on the terminal Board 12 that is installed in the terminal box 9. This same Board 12 are summed and potpan cable external connections. In a box placed packing silica gel 13. The lateral surface of thermoelectric coolers 3 surrounded by a protective barrier of the two rubber bands 14 and covered the outside of a single continuous protective coating, for example, of silicone sealant 15.

To improve heat transfer at the surface of contact of thermoelectric coolers 3 applied silicone heat-conducting paste (CPT-8). Cool and mounted on insulating strips 16. Fin air heat exchanger 17 is pressed into the base 18 of the heat exchanger 1.

The device operates as follows. When the Assembly of the heat exchangers 1 and 2 tighten screws 5 up until the heat exchangers will not converge to a distance equal to the height of the stops 6, which is a few tenths of a millimeter greater than the height of thermoelectric coolers 3. Thermoelectric coolers initially feel some pressure, transmitted to them from the heat exchanger through the heat-conducting paste, but when it stops, stop the convergence of the heat exchanger, thermally conductive silicone paste, possessing appreciable fluidity, will ease the pressure on the coolers. When the thickness of the layer of paste on both sides of the cooler will be equal to the difference between the heights of the stops and coolers, pressure on the latter will cease and all further operation of the device will occur when fully mechanically unloaded the coolers. To avoid displacements (in the conditions of shaking and vibration) thermoelectric coolers 3, communication with the heat exchange surfaces made only with the help of a viscous heat-conducting paste applied strips 16 made of insulating material and having a profile that holds coolers from linear displacements. The strap 16 by screws fastened on the wall of the water heat exchanger is 2. Error 16 is also fixed electrical conductors from thermoelectric coolers and temperature sensors 4.

Protective barrier thermoelectric coolers is formed of two strands of square section 14. One harness taped to air heat exchanger 1, the other to the water 2. Between the bundles is provided a gap of from 0.5 to 2.0 mm When the coating on the outside harness silicone sealant 15 to form a continuous protective layer overlying the gap between the bundles. When the device is switched on when the temperature of both heat exchangers can vary significantly, protective barrier, having elasticity, maintains mechanical strength and vapor moisture-proof. The wires from thermoelectric coolers 3 and temperature sensors 4 through the channels 8 in the wall of the water heat exchanger 2 output in the terminal box 9. Terminal box tightly closed with the cap 10, and the cable connection is carried out through the stuffing box buxu. Thus, the operation of thermoelectric coolers 3 is in a completely sealed area, which excluded the access of water vapor. For a complete elimination in a sealed area of the residual water vapor in a terminal box attached packing silica gel 13.

Removing cables the current-carrying circuits of all thermoelectric coolers on the terminal Board 12 inside the terminal box 9 call which allows to quickly vary the switching circuit coolers and select the required values for the characteristics of the device.

Thus, the present invention by combining the different connections of the current-carrying circuits thermochemically is possible to change and to choose the necessary characteristics of any possible options-parallel connection, which increases the efficiency of its management. In previously known devices (for example, EN 2397074) was provided by the possibility of combining different compounds, but only in the process of its manufacture (by connecting modules on the current sites inside the structure).

In the present invention is used 24 thermoelectric cooler. As shown by tests, this is a reasonable number for maximum number of combinations necessary connection options. The device 24 thermoelectric coolers optimally well as dimensions and weight (about 12 kg), making it convenient for use in refrigerating plants of various capacity.

To avoid the destruction of places of pressing ribs 17 in the base 18 of the heat exchanger 1 (at negative temperatures of the cooled air in the conditions of dew and frost formation) zone offset (Fig.3) is treated with a waterproof varnish, for example UR-231, which fills all leaks, cracks, micropa the spine, inevitably remain after pressing ribs. Thus preventing the flooding of these leaks and cracks. Thus, the reliability of the TEC module is increased.

When the device is in the courts in the water heat exchanger serves for cooling water, the temperature of which may reach 5C. the outer walls of the heat exchanger can drop the dew. Prolonged exposure to condensed moisture on the walls of the heat exchanger can cause increased corrosion. In addition, as experience shows, the amount of condensed moisture on the walls of the heat exchanger in the hour can be up to 100 ml, which is equivalent to an additional heat load of 60 watts. When the estimated load on the heat exchanger 600 watt additional load from the condensate can be taken into account. To improve the efficiency of water heat exchangers and increase the corrosion resistance of the outer surface of the water heat exchangers are covered with liquid ceramic insulation coating type "Corundum", excluding the loss on the covered surfaces of the condensate.

1. Heat exchanger, consisting of tightened screws air and water heat exchangers, between which is in thermal contact established thermoelectric coolers located in the form of a rectangle and surrounded by sametimeserver, characterized in that it further provided with a terminal box, which is located on the outer side of the water heat exchanger and is connected with a cavity in which are thermoelectric coolers and temperature sensors, through channels made in the wall of the water heat exchanger, while in the above-mentioned channels are electrical wires coolers and sensors whose outputs are mounted on the terminal Board installed in the terminal box, while in the above box through the gland seal summed cable external connections, and a protective barrier is formed of two strands of square section, which is installed with a gap relative to each other, one harness is located on the air heat exchanger, the other on the water, and the outer lateral surface of the protective barrier covered by a continuous layer of coating.

2. Heat exchanger under item 1, characterized in that the terminal box is further provided with a desiccant, such as silica gel.

3. Heat exchanger under item 1, characterized in that between the wiring provided a gap of from 0.5 to 2.0 mm

4. Heat exchanger under item 1, characterized in that on the outer side surfaces of the protective barrier is a coating of silicone sealant.



 

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