KR20000014728A - Over frost settlement preventing device and defrosting method for evaporator - Google Patents

Abstract

PURPOSE: An over frost settlement preventing device for an evaporator is provided to prevent the over deposit of the moisture among circulation cool air on an evaporator and to lengthen the defrosting cycle. CONSTITUTION: The cooling system(1) of a refrigerator comprises:a compressor(3) to compress the low pressure coolant; a condenser(11) to discharge the heat from the high temperature coolant by heat radiation pipes(5, 7, 9) and to liquefy the coolant; an expansion valve(15) to expand the coolant flowed in through a dryer(13); an evaporator(19) to absorb the heat from the low heat source using the coolant flowed in from the expansion valve passing through an accumulator(17); and a frost deposit device(21) having a suction pipe(20) curved in zigzag and many cooling fins(23) arranged on the curved part lengthwise.; Herein, the coolant in the suction pipe has low temperature about - 5°C so that it can absorb the ambient heat by heat exchanging.

Description

System for preventing excess-frosting of evaporator of refrigerator and defrosting method

The present invention relates to a device for preventing evaporator over-flocculation of a refrigerator. More particularly, the present invention relates to an inside of an intake duct in front of a cold air suction hole through which cold air is sucked from a refrigerating chamber or an inside of an intake duct in which cold air introduced from a plurality of cold air suction holes is collected. Evaporator over-deposition prevention device that prevents water from escaping into the evaporator during circulating cold air by installing a defrosting machine formed by bending the suction pipe of the system in a zigzag, and reduces the power consumption by extending the defrosting cycle, and when the compressor is stopped The present invention relates to a defrosting defrosting method that allows defrosting of the refrigerating chamber with room temperature air in the refrigerating chamber by circulating the refrigerating chamber air into the intake duct.

In general, a refrigerator employs a cooling system shown in FIG. 1 to make cold air necessary for refrigeration and freezing. The cooling system 101 includes a compressor 103 for compressing a low pressure refrigerant, a heat dissipation pipe ( An expansion valve 115 for expanding the refrigerant flowing into the low pressure state through the condenser 111 for releasing heat from the high temperature refrigerant and then liquefying by the 105, 107 and 109, and an expansion valve. It consists of an evaporator 119 which absorbs heat from a low heat source using the refrigerant introduced from 115 through the accumulator 117.

Accordingly, in the refrigerator cooling system 101 of the refrigerator, a refrigerant, such as a freon gas, is compressed at a high temperature and high pressure in the compressor 103 and is supplied to the auxiliary heat dissipation pipe 105 during the operation of the refrigerator. At this time, since the auxiliary heat dissipation pipe 105 is usually installed at the lower end of the refrigerator, the defrosted water from the evaporator 119 is evaporated to a high temperature of about 75 ° C. transmitted from the compressor 103. In this process, the high-temperature refrigerant is deprived of the heat required to evaporate the defrosted water and thus has a secondary effect of cooling to a certain level.

Next, the refrigerant passing through the auxiliary heat dissipation pipe 105 passes through the hot pipe 107. The hot pipe 107 is generally installed in the door side cabinet of the refrigerator so as to pass through the front part. The dew condensation phenomenon caused by the temperature difference between the inside of the refrigerator and the outside temperature is prevented. In this case, the refrigerant, which loses a certain amount of heat to evaporate the generated water drops, is cooled once again.

In this way, the refrigerant via the hot pipe 107 is sufficiently cooled through the thick plate pipe 109 or the condenser 111 to be liquefied and then supplied to the dryer 113. At this time, the dryer 113 passes through the condenser 111 and serves to completely remove moisture remaining in the coolant that is generated in the coolant cooled from the high temperature state to the low temperature state. This is to prevent the cooling efficiency from being significantly lowered by the thermal conductivity of the refrigerant and water when heat is supplied to the evaporator 119 as it is, as the refrigerant remains as above.

The high temperature and high pressure refrigerant from which moisture is removed while passing through the dryer 113 is introduced into the expansion valve 115 having a capillary shape. In the expansion valve 115, the refrigerant is rapidly adiabaticly expanded from high pressure to low pressure to a low temperature low pressure state, and the temperature is reduced to about -30 ° C.

The liquid refrigerant, which is brought into a low temperature and low pressure state by the expansion valve 115, is rapidly evaporated in the evaporator 119 to deprive the temperature of the surrounding air to generate cold air supplied to the freezer compartment and the refrigerating compartment. At this time, since the liquid refrigerant that is not sufficiently vaporized in the evaporator 119 is separated into the accumulator 117, the refrigerant supplied to the compressor 103 through the suction pipe 120 becomes a pure liquid state.

As described above, the evaporator 119 that generates cold air by the heat of vaporization of the refrigerant is mounted on the cold air duct 131 behind the freezing chamber 130 of the refrigerator 100. Accordingly, the cold air cooled by the evaporator 119 is forcedly blown by the cold air circulation fan 135 installed adjacent to the cold air blowing hole 133 formed through the freezing chamber 130, and thus is stored along the cold air duct 131. 137) and the freezer compartment 130 to keep the stored food in a fresh state.

At this time, the air circulated to the evaporator 119 through the refrigerating chamber 137 and the freezing chamber 130 contains moisture evaporated from the stored food and moisture introduced when opening and closing the refrigerator doors 141 and 143. Moisture-containing water is imaged in the evaporator 119 while passing through 119.

As such, the frost formed on the evaporator 119 acts as a heat insulating material that blocks direct contact between the evaporator 119 and the circulating air, thereby preventing the air to be supplied to the refrigerating chamber 137 and the freezing chamber 130 from being sufficiently cooled. Cause.

Accordingly, various kinds of defrosting means are provided to remove the frost formed on the evaporator 119 at a predetermined level, and one of the general forms thereof may include a defrost heater 139 as shown in FIG. 3. have.

The defrost heater 139 is driven by a predetermined control device based on data such as the continuous operating time of the evaporator 119, the temperature change in the refrigerator, and the like. The drive is stopped by the defrost detection signal and is installed at the lower end of the evaporator 119 to gradually remove frost formed on the cooling fins of the evaporator 119 from below to upward. Since the air recovered from the freezing chamber 130 is directly supplied to the evaporator 119, the amount of frost generated in the evaporator 119 is increased in a short time to prevent the heat transfer rate between the refrigerant pipe and the air from rapidly deteriorating. There is no problem.

Therefore, in order to delay the rapid conception of the evaporator 119 as described above, the collected cold air sucked into each of the cold air inlets 131a and 131b of the freezing compartment 130 and the refrigerating compartment 137 is around the implantation plate 145. A method of reducing the moisture contained in the air supplied to the evaporator 119 is used by inducing a primary idea by passing through.

Here, the installation state of the implantation plate 145 is an evaporator along a surface opposite to each other in the state in which the cold recovered in the freezing chamber 130 and the cold air recovered in the refrigerating chamber 137 are separated by the implantation plate 145. 119),

By the way, when the temperature difference (ΔT) of the cold air recovered from the freezing chamber 130 and the refrigerating chamber 137 is large, the amount of implantation in the concept plate 145 becomes large due to the large temperature difference between both sides of the concept plate 145. If the temperature difference recovered from the 130 and the refrigerating chamber 137 is small, the temperature difference between both sides of the implantation plate 145 is reduced, so that the amount of implantation is reduced, so that the amount of implantation of the evaporator 119 is relatively increased and the defrost cycle is shortened. There is a problem to increase the power consumption.

In addition, a method of reducing the amount of frost formed on the evaporator by removing moisture in the cold air passing through the intake duct has been proposed. As an example, a dedicated evaporator disclosed in Korean Utility Model Publication No. 96-2857 is provided. One refrigerator 201 is mentioned.

As shown in FIG. 3, the refrigerator 201 is a separate dedicated implantation device independently of the cooling evaporator in the duct 211 in which the cold air circulating in the freezer compartment 230 forms a flow path leading to the cooling evaporator 219. By installing the evaporator 210, water is removed in advance from the cold air flowing from the duct 211, thereby reducing the amount of frost formed on the cooling evaporator 219.

However, the pre-dehumidification method by such an implantation-only evaporator 210 has another problem of lowering the efficiency of the refrigerator due to the double defrosting action, because the defrosting-only evaporator 210 must also defrost.

Accordingly, the present invention has been made in view of the above problems, the first object of the present invention is to implant the moisture in the refrigerating compartment cold air in advance before the cold air sucked from the refrigerating chamber flows into the evaporator in advance to the moisture in the circulation cold air to the evaporator It is to provide an evaporator over-deposition preventive device to prevent defrosting to extend so that the defrosting period is extended.

It is a second object of the present invention to provide a defrosting defrosting method for defrosting a defrosting through circulation air in a refrigerating chamber without providing a defrosting heater as in the prior art.

1 is a schematic configuration diagram showing a cooling system of a typical refrigerator

2 is a schematic cross-sectional view showing the internal structure of a refrigerator equipped with a cooling system shown in FIG.

3 is a side cross-sectional view of a refrigerator having an evaporator dedicated to implantation;

Figure 3 is a schematic block diagram showing a cooling system of a refrigerator to which the evaporator anti-deposition apparatus according to an embodiment of the present invention is applied.

Figure 4 is a schematic cross-sectional view showing the internal structure of the refrigerator to which the evaporator anti-deposition apparatus according to an embodiment of the present invention is applied

Figure 6 is a block diagram showing an evaporator anti-deposition apparatus according to an embodiment of the present invention

Figure 7 is a schematic block diagram showing an evaporator anti-deposition apparatus according to another embodiment of the present invention

Explanation of symbols on the main parts of the drawings

19: evaporator 20: suction pipe

21: implantation 23: cooling fins

27: refrigerator compartment suction duct 27a: refrigerator compartment suction hole

29: defrost water receiver 40: humidifier

The present invention for achieving the first object as described above is a cold air circulation system of the refrigerator having a fan for cooling the air sucked from the refrigerating chamber through the evaporator, the intake duct by heat exchange of the evaporator and discharged back to the refrigerating chamber through the exhaust duct. The cold air in which the cold air is sucked from the refrigerating chamber is formed by a suction pipe configured to repeatedly transfer the refrigerant gas passing through the evaporator to the compressor, and a plurality of cooling fins arranged in the longitudinal direction at the bent portion. An object of the present invention is to provide an evaporator anti-sticking apparatus installed in an intake duct in front of a suction hole or in an intake duct where air introduced from a plurality of cold air suction holes is collected.

The present invention for achieving the second object as described above is provided with a fan for cooling the air sucked from the refrigerating chamber through the evaporator and the intake duct by heat exchange of the evaporator and discharged back to the refrigerating chamber through the exhaust duct, passing through the evaporator In the control of a refrigerator installed using a suction pipe that delivers a refrigerant gas to a compressor, the refrigerator is installed in a refrigerating chamber intake duct upstream of the evaporator. When the compressor is stopped, the fan is operated so that the refrigerating chamber air is implanted. It is to provide a defrosting defrosting method for circulating into the intake duct provided with a group.

Hereinafter, an embodiment of the present invention will be described in more detail based on the accompanying drawings.

4 shows a cooling system 1 of a refrigerator to which an evaporator anti-slip device according to an embodiment of the present invention is applied, a compressor (3) for compressing a low pressure refrigerant, and a heat dissipation pipe (5) (7) ( 9) a condenser 11 for releasing heat from the high temperature refrigerant and then liquefying, an expansion valve 15 for expanding the refrigerant flowing through the dryer 13 to a low pressure state, and accumulating water from the expansion valve 15; The evaporator 19 which absorbs heat from a low heat source by using the refrigerant introduced through the razor 17 is the same as the conventional method, except that the suction pipe which delivers the refrigerant passing through the evaporator 19 to the compressor 3 ( There is a difference that the implantation 21 is provided through 20). At this time, the implantation 21 is formed in a structure in which the suction pipe 20 is bent in a zigzag and the plurality of cooling fins 23 are arranged in the longitudinal direction at the bent portion, as shown in FIG. The refrigerant in the pipe 20 is maintained at a low temperature of about -5 ° to absorb the heat of the surroundings through heat exchange.

5 is a cross-sectional view illustrating a refrigerator 10 to which an evaporator anti-slip prevention device is applied according to an embodiment of the present invention, wherein a freezing compartment 30 is positioned above the refrigerating compartment 37 with a separating wall 22 therebetween. An evaporator 19 of the cooling system 1 is installed at an upper end to which a freezer compartment intake duct 25 through which air is introduced from the freezer compartment 30 and a refrigerating compartment intake duct 27 through which air is introduced from the refrigerating compartment 37 are connected. Downstream of the evaporator 19, cold air is sucked from the freezer compartment 30 and the refrigerating compartment 37 through the suction holes 25a and 27a of the respective intake ducts 25 and 27 and passed through the evaporator 19. A fan 23 for discharging the freezing chamber exhaust duct 26 and the refrigerating chamber exhaust duct 28 through the discharge holes 26a and 28a to the freezing chamber 30 and the refrigerating chamber 37, respectively, is provided.

Each implantation 21 is located inside the intake duct 27 in front of the plurality of cold air suction holes 27a through which cold air is sucked from the refrigerating chamber 37. The implantation 21 at this time allows the intake cold air from the refrigerating chamber 37 to implant moisture in the cold air before reaching the evaporator 19 through the intake duct 27. In addition, the implanter 21 may be installed only at one upper side of the intake duct 27 in which the air introduced from the plurality of cold air suction holes 27a is collected.

In addition, an evaporator 19 and a defrost water receiver 29 which receives defrosted water, that is, defrost water, and stores a predetermined amount of water are installed at the lower portion of the implanter 21, and one side wall of the refrigerating chamber 37 is provided. The ultrasonic humidifier 40 for spraying the humidifying particles into the refrigerating chamber 37 is installed at a position slightly lower than the defrosting water receiver 29. The humidifier 40 is provided in a humidification tank 41 in which a predetermined amount of water is contained, a bucket 43 for supplying water to the humidification tank 41 intermittently, and a bottom surface of the humidification tank 41. A vibrator 45 for atomizing water with an ultrasonic wave, a spray tube 47 installed at an upper portion of the humidification tank 41 to discharge and guide the humidified particles atomized by the vibrator 45 into the refrigerating chamber 37, and It is provided on one side of the spray tube 47 is composed of a blowing fan 49 for forcibly discharging the humidified particles from the humidification tank 45 into the refrigerating chamber 30 through the spray tube 47.

In addition, the bucket 43 is connected to the defrost water receiver 29 through the hose 50, the filter 55 is installed in the opening of the bucket 43 to which the hose 50 is connected. Accordingly, the defrost water filled in the defrost water receiver 29 is supplied to the bucket 43 while passing through the filter 55 through the hose 50 to replenish the humidified water. In addition, the bucket 43 is coupled to the hose 50 in a removable structure to facilitate the separation of the bucket 43 when cleaning and resupply.

Referring to the operation of the evaporator anti-deposition apparatus according to the invention configured as described above are as follows.

The cooling system, the fan 23, the defrost heater 39, and the humidifier 40 are controlled by a predetermined control device. First, when the temperatures of the freezing chamber 30 and the refrigerating chamber 37 are set by the user, the control device operates the compressor 3 and the fan 23 of the cooling system 1. The evaporator 19 which receives the refrigerant from the compressor 3 operated in this way absorbs the heat of the surroundings as the refrigerant evaporates rapidly.

At this time, the fan 23 sucks air from the freezer compartment 30 and the refrigerating compartment 37 through the suction holes 25a and 27a of the freezer compartment intake duct 25 and the refrigerating compartment intake duct 27, and the evaporator 19. By discharging the food in the freezer compartment 30 through the discharge holes 26a and 28a of the freezer compartment exhaust duct 26 and the refrigerating compartment exhaust duct 28 to the freezer compartment 30 and the refrigerating compartment 37 while heat-exchanging. It is possible to store, and refrigerated storage of food in the refrigerating chamber (37).

In this process, the refrigerant in the evaporator 19 is normally maintained at −30 ° C., and the temperature of the refrigerant passing through the evaporator 19 and passing through the suction pipe 20 is maintained at about −5 ° C. Accordingly, the low temperature implantation 21 may reduce the amount of implantation in the evaporator 19 by primarily inducing the implantation of moisture in the hot and humid air sucked from the refrigerating chamber intake duct 27.

In addition, the control device in the refrigerating and freezing process stops the compressor 3 and drives the refrigerating chamber fan 23 when the temperatures in the refrigerating chamber 37 and the freezing chamber 30 reach a temperature selected by the user. At this time, the cold air of the refrigerating chamber 37 flows into the intake duct 27 through the suction hole 27a and sequentially passes through the exhaustion duct 28 and the discharge hole 28a through the implantation 21 and the evaporator 19. Through the circulation process is discharged back to the refrigerating chamber 37, the room temperature air in the refrigerating chamber 37 circulated in this way to defrost the frost formation 21 to defrost the frost formation 21.

That is, since the temperature of the frosting 21 is not very low as the evaporator 19, the temperature of the frost formed on the frost 21 is higher than the temperature of the frost formed on the evaporator 19. Therefore, in the castle of the implantation 21 in the present invention can be easily melted only by air at room temperature, there is no need to defrost through the defrost heater as in the conventional refrigerator.

On the other hand, in the refrigerating and refrigerating process as described above, the control means detects the humidity in the refrigerating chamber 37 through the humidity sensor, and when the detected humidity is lower than the humidity value set by the user or the like, the vibrator 45 of the humidifier 40. It will work. In this case, the vibrator 45 vibrates to generate ultrasonic waves in the water in the humidification tank 41 to atomize the humidifying water. The atomized humidifying particles are sprayed into the refrigerating chamber 37 through the spray tube 47 to store the refrigerating chamber ( 37) improves the freshness of food by humidifying and increases the cooling effect through the latent heat of evaporation of moisture.

In addition, the defrosted water of the defrosted evaporator 19 or the cultivator 21 is supplied to the bucket 43 of the humidifier 40 along the hose 50 while being accumulated in the defrost water receiver 29. The constant replenishes the humidified water of the bucket 43 which is consumed during humidification in the state in which foreign matters are filtered out by the filter 55.

7 is a view illustrating an evaporator over-accumulation prevention apparatus according to another embodiment of the present invention, in which a projection 21 using a suction pipe 20 is installed in an air circulation duct 80 in a refrigerating chamber. That is, the implanter 21 is installed inside the branched suction duct 81 of the air circulation duct 80. Accordingly, in the process of driving the blower fan 85 in the air circulation duct 80, the implanter 21 is sucked through each suction duct 81 and the moisture in the refrigerating chamber air discharged to the discharge duct 83. It is possible to dehumidify the refrigerating compartment by implanting.

As described above, the present invention includes an implantation using a suction pipe of a cooling system in the refrigerating chamber intake duct, and pre-condenses moisture in the refrigerating chamber cold air before entering the evaporator, so that the temperature difference between the refrigerating chamber and the freezing chamber is small. By preventing moisture from circulating in the circulating cold air, the defrosting cycle can be extended and power consumption can be reduced.

In addition, the present invention has the effect that can be defrosted by the air at room temperature of the refrigerating chamber by circulating the refrigerating chamber air into the intake duct through the refrigerating chamber fan when the compressor is stopped.

In addition, the present invention has the effect of reducing the hassle of replenishing the humidification water of the bucket by connecting the defrosting water receiver installed in the lower portion of the concept with the bucket of the refrigerating chamber humidifier to automatically replenish the defrost water with humidifying water.

While the invention has been shown and described with respect to particular embodiments, those skilled in the art will recognize that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the appended claims. Anyone can easily know.

Claims (2)

The fan 23 which cools the air sucked from the refrigerating compartment 37 through the evaporator 19 and the intake duct 27 by heat exchange of the evaporator 19 and discharges it back to the refrigerating compartment 37 through the exhaust duct 28. In the cold air circulation system of the refrigerator provided with The suction pipe 20 which transfers the refrigerant gas passing through the evaporator 19 to the compressor 3 is repeatedly formed in multiple stages, and a plurality of cooling fins 23 are arranged in the longitudinal direction at the bent portion. An air intake duct 27 in which air introduced from the air intake duct 27 or a plurality of cold air intake holes 27a in front of the cold air intake hole 27a through which the air 21 is sucked from the refrigerating chamber 37 is collected. Evaporator anti-deposition device, characterized in that installed inside. The fan 23 which cools the air sucked from the refrigerating compartment 37 through the evaporator 19 and the intake duct 27 by heat exchange of the evaporator 19 and discharges it back to the refrigerating compartment 37 through the exhaust duct 28. Is provided, and a cultivation unit 21 configured by using a suction pipe 20 for transferring the refrigerant gas passing through the evaporator 19 to the compressor 3 is a refrigerating chamber intake duct 27 upstream of the evaporator 19. In controlling the refrigerator installed inside, The defrosting defrosting method according to claim 1, wherein when the compressor (3) is stopped, the fan (23) is operated to circulate air in the refrigerating chamber (37) into the intake duct (27) in which the cultivator (21) is installed.