CN100498103C - Cold area anti-frost fresh-air exchanger - Google Patents

Abstract

The present invention relates to fresh air providing ventilator, and is especially one kind of fresh air providing ventilator for use in cold area and without frosting. The fresh air providing ventilator has one motor fixed on the support between the temperature acquiring controller and the driving mechanism, one thermocouple probe set beside the indoor hot air outlet, and one second slide bar with lower end connected to the middle section of the partition board. The present invention can avoid frosting effectively, and has high heat exchange efficiency and low cost.

Description

Avoid the cold district fresh air ventilator of frosting

Technical field

The present invention relates to a kind of fresh air ventilator.

Background technology

The porous mass that frost is made up of ice crystal and air.The frosting phenomenon extensively is present in fields such as refrigeration, cryogenic liquid storing, gas liquefaction, Aero-Space and HVAC.The existence of frost layer reduces the equipment heat transfer efficiency, and crushing increases, and system is produced bigger influence, even cause thrashing.Thereby over year, the frosting problem has been subjected to the extensive concern of scientific and technological circle surplus in the of 60.From existing document, can be divided into two big classes about the research of frosting problem: the first kind is the research of frost Formation Mechanism, by method theoretical and that test study white rerum natura, white layer growth rule and frosting process heat and mass etc. in time with the Changing Pattern in space; The another kind of achievement of then utilizing last class, the growth course of research frost is to the finned tube exchanger Effect on Performance.Fresh air ventilator exists difference along with the different integral performance of region in actual applications, and particularly at China Han Qu, during cold district winter operation, outdoor exhaust outlet place exists the problem of frosting.If the untimely removing of long-pending frost at outdoor exhaust outlet place will be stopped up air duct and be reduced heat transfer area, ventilation volume and heat exchange efficiency obviously reduce, and the overall performance of fresh air ventilator is descended.The defrost system of existing fresh air ventilator generally has two kinds of electric defrost system and bypass defrost systems.But be that electric defrost system or bypass defrost system all can only guarantee there be not the sufficiently high temperature of output under the situation of frosting, and temperature output is almost nil frosting the time, and the bypass defrost system has just exported without any temperature in defrost cycle.Other forms of frosting be controlled at outdoor temperature when being lower than 0 ℃ heat recovery rate die-off, particularly drop to-20 ℃ in outdoor temperature in heat recovery rate almost drop to 0%.

Summary of the invention

No matter the defrost system that the objective of the invention is for solving existing fresh air ventilator is electric defrost system, still the bypass defrost system all can only guarantee there be not the sufficiently high temperature of output under the situation of frosting, and temperature output is almost nil frosting the time, and the bypass defrost system has just exported without any temperature in defrost cycle.Other forms of frosting be controlled at outdoor temperature when being lower than 0 ℃ heat recovery rate die-off, particularly drop to-20 ℃ in outdoor temperature in heat recovery rate almost drop to 0% problem, a kind of cold district fresh air ventilator of avoiding frosting is provided.The present invention is by transmission mechanism 1, first slide bar 2, second slide bar 3, motor 4, temperature acquisition controller 5, thermocouple 6, distributary plate-fin heat exchanger 7, dividing plate 10, support 11, the slide block 15 of first slide bar, the slide block 17 of the slide plate 16 and second slide bar is formed, the upper end of distributary plate-fin heat exchanger 7 is provided with indoor hot-air gas outlet 8, the lower end of distributary plate-fin heat exchanger 7 is provided with indoor hot air inlet 13, the left end of distributary plate-fin heat exchanger 7 is provided with outdoor cold air air inlet 12, the right-hand member of distributary plate-fin heat exchanger 7 is provided with outdoor cold air gas outlet 9, support 11 is fixed on the upside of distributary plate-fin heat exchanger 7 left ends, temperature acquisition controller 5 is fixed on the right-hand member of support 11 upsides, transmission mechanism 1 is fixed on the left end of support 11 upsides, motor 4 is fixed on the support 11 between temperature acquisition controller 5 and the transmission mechanism 1, the output shaft of motor 4 is connected with the input of transmission mechanism 1, temperature acquisition controller 5 is electrically connected with motor 4, thermocouple 6 is electrically connected with temperature acquisition controller 5, the probe of thermocouple 6 is arranged on the medial extremity of first vertical row's fin 14 of indoor hot-air gas outlet 8 one sides, first slide bar 2 is connected with the output of transmission mechanism 1, the slide block 15 of first slide bar is arranged on the lower end of first slide bar 2, second slide bar 3 is connected with the slide block 15 of first slide bar 2 by first slide bar, slide plate 16 is fixed on the downside of support 11, the slide block 15 and the slide plate 16 of first slide bar are slidingly connected, the left end of the left end of dividing plate 10 and support 11 is hinged, the slide block 17 of second slide bar is fixed on the lower end of second slide bar 3, and the slide block 17 and the dividing plate 10 of second slide bar are slidingly connected.The motion of the slide block of second slide bar (17) drives dividing plate (10) and moves up and down.The present invention can effectively avoid the generation of frosting phenomenon, and heat exchange efficiency height, equipment are simple, initial cost and operating cost are cheap.The present invention is that to prevent and treat up to now with the distributary plate type heat exchanger be the optimum device of the fresh air ventilator frosting of core.

Description of drawings

Fig. 1 is an overall structure schematic diagram of the present invention.

The specific embodiment

The specific embodiment one: (referring to Fig. 1) present embodiment is by transmission mechanism 1, first slide bar 2, second slide bar 3, motor 4, temperature acquisition controller 5, thermocouple 6, distributary plate-fin heat exchanger 7, dividing plate 10, support 11, the slide block 15 of first slide bar, the slide block 17 of the slide plate 16 and second slide bar is formed, the upper end of distributary plate-fin heat exchanger 7 is provided with indoor hot-air gas outlet 8, the lower end of distributary plate-fin heat exchanger 7 is provided with indoor hot air inlet 13, the left end of distributary plate-fin heat exchanger 7 is provided with outdoor cold air air inlet 12, the right-hand member of distributary plate-fin heat exchanger 7 is provided with outdoor cold air gas outlet 9, support 11 is fixed on the upside of distributary plate-fin heat exchanger 7 left ends, temperature acquisition controller 5 is fixed on the right-hand member of support 11 upsides, transmission mechanism 1 is fixed on the left end of support 11 upsides, motor 4 is fixed on the support 11 between temperature acquisition controller 5 and the transmission mechanism 1, the output shaft of motor 4 is connected with the input of transmission mechanism 1, temperature acquisition controller 5 is electrically connected with motor 4, thermocouple 6 is electrically connected with temperature acquisition controller 5, the probe of thermocouple 6 is arranged on the medial extremity of first vertical row's fin 14 of indoor hot-air gas outlet 8 one sides, first slide bar 2 is connected with the output of transmission mechanism 1, driving first slide bar 2 by transmission mechanism 1 moves up and down, the slide block 15 of first slide bar is arranged on the lower end of first slide bar 2, second slide bar 3 is connected with the slide block 15 of first slide bar 2 by first slide bar, slide plate 16 is fixed on the downside of support 11, the slide block 15 and the slide plate 16 of first slide bar are slidingly connected, the slide block 15 of first slide bar can be along with moving up and down of first slide bar 2 on slide plate 16 move left and right, thereby drive second slide bar, 3 move left and right, the left end of the left end of dividing plate 10 and support 11 is hinged, the slide block 17 of second slide bar is fixed on the lower end of second slide bar 3, the slide block 17 and the dividing plate 10 of second slide bar are slidingly connected, when second slide bar, 3 move left and right, cause slide block 17 motions, move up and down thereby drive dividing plate 10.

Above-mentioned embodiment thermocouple 6 detects the temperature at hot air outlet place in real time, and point for measuring temperature is arranged in the inboard of new wind outlet first vertical row's fin, and apart from the position of heat exchanger plates 0.5mm, this is the thickness of frosting process phase I frost layer.Thermocouple 6 sends the temperature information that collects to temperature acquisition controller 5, and 5 pairs of temperature informations of temperature acquisition controller are judged.When if the hot air outlet temperature that thermocouple 6 records is lower than 0 ℃, control system picks up counting, motor 4 is not the position that starts moveable partition board at once, but set 10～20 minutes delay, after 10～20 minutes, temperature acquisition controller 5 output informations, control motor 4 is just changeing, first slide bar 2 moves down, the slide block 15 of first slide bar moves to right, and drives second slide bar 3 and moves to right, slide block 17 accompany movements of second slide bar, move down, be displaced downwardly to distributary plate 1/4th height and positions thereby drive dividing plate 10.This dividing plate 10 stops cold air to pass through frosting position, and the waste heat that utilizes hot-air melts the ice crystal of formation, when white melting layer, temperature is increased to 2 ℃, and thermocouple 6 sends temperature information to temperature acquisition controller 5,4 counter-rotatings of temperature acquisition controller 5 control motor, sliding on first slide bar 2, the slide block 15 of first slide bar moves to left, and drives second slide bar 3 and moves to left, move on the slide block 17 of second slide bar, move to horizontal level thereby drive on the dividing plate 10.Distributary plate-fin heat exchanger operate as normal.So repeatedly, reach the effect of anti-frosting and defrosting.As can be seen from Figure 1, the rate of heat exchange of the indoor air flow of close outdoor cold air air inlet 12 is near 100%.Therefore, this air stream outlet temperature is near outdoor temperature.Drop to 1 ℃ of some place blocking-up outdoor airflow at indoor air flow, outdoor airflow forms streams motion, in the heat exchanger tube that the vertical fin of first row of being close to outdoor cold air air inlet 12 constitutes, just no longer include heat exchange from this point cold air and the cold angular zone of heat exchanger outside 8 sections of indoor hot-air gas outlet, the discharge temperature in being close to first row's heat exchanger tube of outdoor cold air air inlet 12 is 1 ℃ in the distributary plate-fin heat exchanger 7 so.So, first row's heat exchanger tube can not produce the frost layer at that section of cold angular zone.In like manner, at the place, the cold angular region of heat exchanger tube that the vertical fin of first row constitutes, outdoor cold air decreases through heat exchange, the thermograde of indoor return air air reduces, inevitable greater than 1 ℃ in the dividing plate 10 and the gas flow temperature of intersection point 18 near zones of distributary plate-fin heat exchanger 7, this zone can frosting yet.The heat exchanger tube of vertical fin correspondence equally, afterwards can frosting at cold angular zone.Outdoor cold air is behind the intersection point 18 by dividing plate 10 and distributary plate-fin heat exchanger 7, must spread to whole heat exchanger space, its result just walks around cold angular zone, not only do not waste too much heat exchange area, and it makes the heat exchange in the whole heat exchanger very even, the temperature or the temperature of outdoor cold air gas outlet 9 that are indoor hot-air gas outlet 8 are all very even, do not have very big gradient.Be that electric defrost system or bypass defrost system all can only guarantee there be not the sufficiently high temperature of output under the situation of frosting, and temperature output is almost nil in frosting, and the bypass defrost system has just exported without any temperature in defrost cycle.Other forms of frosting be controlled at outdoor temperature when being lower than 0 ℃ heat recovery rate die-off, particularly drop to-20 ℃ in outdoor temperature in heat recovery rate almost drop to 0%.This system still can keep very high heat recovery rate when can be lower than-20 ℃ in outdoor temperature.Because dividing plate 10 has been eliminated the heat exchange at cold angular zone, the heat transfer rate of heat exchanger decreases theoretically.But the heat exchanger that does not have this system, heat exchange efficiency significantly reduces even is zero under frozen condition; Though the electricity defrost system can guarantee continuing of heat exchange efficiency, itself has but consumed lot of energy electric defrosting, and this itself has just run counter to energy-conservation principle; And bypass system can not guarantee the lasting heat exchange of heat exchanger, has influenced the operational efficiency of fresh air ventilator.So consider these factors, the heat exchange efficiency of the novel fresh air ventilator of this transformation of process is the highest.Owing to avoided the formation of frost layer in the heat exchanger as far as possible, defrost system and defrost cycle have also just been saved, even occurred white layer suddenly, intercept cold air by the frosting zone by the automatic controlling system dividing plate, the frost layer region has stopped the heat exchange with outdoor cold air suddenly, and the frost layer can be melted fast by the heat of indoor return air like this.[digital temperature controller (CG-C series) CG-C48BD that temperature acquisition controller 5 adopts Zhejiang ultraphotic instrument Co., Ltd to produce.Thermocouple 6 uses NR-81530 type thermocouple temperature sensor.The two-way controllable motor TYK50-16 that motor 4 uses Shunde District, the Foshan City emerging micro machine of perseverance Co., Ltd to produce].

Claims (1)

1, a kind of cold district fresh air ventilator of avoiding frosting, it is by transmission mechanism (1), first slide bar (2), second slide bar (3), motor (4), temperature acquisition controller (5), thermocouple (6), distributary plate-fin heat exchanger (7), dividing plate (10), support (11), the slide block of first slide bar (15), the slide block (17) of the slide plate (16) and second slide bar is formed, the upper end of distributary plate-fin heat exchanger (7) is provided with indoor hot-air gas outlet (8), the lower end of distributary plate-fin heat exchanger (7) is provided with indoor hot air inlet (13), the left end of distributary plate-fin heat exchanger (7) is provided with outdoor cold air air inlet (12), the right-hand member of distributary plate-fin heat exchanger (7) is provided with outdoor cold air gas outlet (9), it is characterized in that support (11) is fixed on the upside of distributary plate-fin heat exchanger (7) left end, temperature acquisition controller (5) is fixed on the right-hand member of support (11) upside, transmission mechanism (1) is fixed on the left end of support (11) upside, motor (4) is fixed on the described support (11) between temperature acquisition controller (5) and the transmission mechanism (1), the output shaft of motor (4) is connected with the input of transmission mechanism (1), temperature acquisition controller (5) is electrically connected with motor (4), thermocouple (6) is electrically connected with temperature acquisition controller (5), the probe of thermocouple (6) is arranged on the medial extremity of first vertical row's fin (14) of indoor hot-air gas outlet (8) one sides, first slide bar (2) is connected with the output of transmission mechanism (1), the slide block of first slide bar (15) is arranged on the lower end of first slide bar (2), second slide bar (3) is connected with the slide block (15) of first slide bar (2) by first slide bar, slide plate (16) is fixed on the downside of support (11), the slide block of first slide bar (15) is slidingly connected with slide plate (16), the left end of the left end of dividing plate (10) and support (11) is hinged, the slide block of second slide bar (17) is fixed on the lower end of second slide bar (3), the slide block of second slide bar (17) is slidingly connected with dividing plate (10), and the motion of the slide block of second slide bar (17) drives dividing plate (10) and moves up and down.