JP2012193864A - Use side unit of refrigeration apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a use side unit of a refrigeration apparatus which is free from dew splashing outside the unit during defrost operation.SOLUTION: The use side unit 1 of a refrigeration apparatus includes a unit casing 1A having an air inlet 25 and an air outlet 26, a ventilation path 27 which is formed in the unit casing 1A and communicates the air inlet 25 with the air outlet 26, a use side heat exchanger 2 of a refrigerant circuit for partitioning the ventilation path 27 to allow free ventilation, a sirocco fan 3 disposed on the upstream side of the ventilation path 27, and a drain pan 5 disposed on the downstream side of the ventilation path 27, and performs defrost operation of a use side heat exchanger 2. The use side heat exchanger 2 is set upright and located in a position (S) nearest to a blower on the drain pan 5.

Description

  The present invention relates to a use side unit of a refrigeration apparatus for cooling a space to be cooled such as in a refrigerator.

  As a defrosting method for the use side unit of the conventional refrigeration system, when the internal temperature is 0 ° C. or less, a method of heating with a heater attached to the use side heat exchanger, the refrigerant flow direction in the refrigerant circuit is reversed. Reverse flow defrost method that melts frost by flowing hot gas refrigerant through the use side heat exchanger, and when the internal temperature exceeds 0 ° C, the flow of refrigerant in the refrigerant pipe of the use side heat exchanger is stopped. An off-cycle defrost system that melts frost by operating only a fan is used. In this off-cycle defrost system, if the air flow of the blower fan is too large or the usage-side heat exchanger is clogged with frost, the wind speed passing through the usage-side heat exchanger increases, so the frost melted during defrosting In some cases, so-called dew splattering occurs in which the water drops out of the machine as water droplets.

Therefore, by adjusting the inverter frequency of the compressor operation, the opening degree of the expansion valve, etc., the surface temperature of the use side heat exchanger is prevented from becoming lower than the dew point temperature of the intake air, and the use side heat exchanger is not dewed. There are proposed a method for controlling the air flow (see, for example, Patent Document 1), a method for controlling the air flow so that water drops do not fly even if dew and frost are attached to the use side heat exchanger.
In the field of air conditioners, the compressor is stopped when the compressor has been operating continuously for more than 10 minutes and the temperature of the liquid pipe at the inlet of the use side heat exchanger is detected to be 1 ° C or lower for 20 minutes continuously. There is also a technique in which freezing prevention control of the usage-side heat exchanger that prevents the refrigerant from being sent to the usage-side heat exchanger is performed to prevent the usage-side heat exchanger from becoming frosted (for example, see Non-Patent Document 1). .

JP-A-2005-147623

Mitsubishi Electric Package Air Conditioner Service Handbook Split Computer Room Air Conditioner 2010 Edition

  In the use side unit deployed in the refrigerator as a load device of the refrigerator cooling system, the fin surface temperature of the use side heat exchanger during the cooling operation is equal to or lower than the dew point temperature of the air in the refrigerator for heat exchange. Water vapor becomes dew and adheres to the surface of the use side heat exchanger. Moreover, when the surface temperature of a use side heat exchanger is 0 degrees C or less, the dew on the use side heat exchanger surface turns into frost. If frost adheres to the usage-side heat exchanger, it becomes difficult to exchange heat between the refrigerant flowing in the piping of the usage-side heat exchanger and the air in the refrigerator, and cooling when the usage-side heat exchanger is not frosted Compared with the capacity, when the usage side heat exchanger is frosted, the cooling capacity is lowered, so the defrosting operation is periodically performed to keep the temperature in the refrigerator.

Here, a general user side unit is shown in FIG. This use side unit 51 has a sirocco fan 3 provided upstream in the ventilation direction (arrow L direction) in the unit casing 1A, and a use side heat exchanger 2A is disposed obliquely on the downstream side in the ventilation direction. This is a unit having a small fin pitch of the exchanger 2A. In the figure, 5 is a drain pan, 6A is a sheet metal for water introduction that is arranged in the lower part of the use side heat exchanger 2A and flows drain pan water from the use side heat exchanger 2A in the left-right direction, and 8 is a sirocco fan 3 and a motor. A support plate that is fixedly supported, 25 is an air inlet, and 26 is an air outlet.
Therefore, when the utilization side unit 51 as described above was diverted and replaced with a utilization side heat exchanger in which only the fin pitch was changed, another utilization side unit was produced, and a large amount of exposure occurred outside the apparatus. In this phenomenon, the use-side heat exchanger 2A is arranged obliquely so that the upper side of the heat exchanger is directed to the blowing side and the lower side of the heat exchanger is directed to the suction side, and this arrangement causes the air blowing port 26 of the unit casing 1A to Since the upper part of the use side heat exchanger 2A is very close, dew generated by frost melting during off-cycle defrosting operation is generated in the wind from the sirocco fan 3 passing through the gaps between the fins of the use side heat exchanger 2A. It was to be released outside the aircraft. In addition, when the use-side heat exchanger 2A is disposed obliquely as described above, the dew generated by melting frost on the upstream side in the ventilation direction of the use-side heat exchanger 2A is also affected by gravity and wind. As a result, dew tends to collect on the downstream side in the ventilation direction of the use side heat exchanger 2A, which is one of the causes of a large amount of dew.

  In addition, the general use side unit described above is different from the general use side unit using a propeller fan, and uses a sirocco fan as a blower. It blows out more linearly. As a result, in the use side heat exchanger, there is a large difference in the wind speed from the sirocco fan between the part where the fan outlet is in front and the part where the fan outlet is not in front. From the fins of the heat exchanger, dew erosion is more likely to occur.

In addition, in the utilization side unit that is diverted and manufactured by changing only the fin pitch of the utilization side heat exchanger as described above, even if the fins of the utilization side heat exchanger have dew if there is no frost. However, if the user side heat exchanger is frosted, the wind passage (hereinafter referred to as the air path) becomes narrower, and the wind speed passing between the fins causes frost on the user side heat exchanger. Since it becomes larger than the state where no is attached, it becomes easy for dew to occur.

The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a use-side unit of a refrigeration apparatus in which no dew is generated outside the unit during the defrosting operation.

The use side unit of the refrigeration apparatus according to the present invention includes a unit casing having an air inlet for sucking air in the refrigerator and an air outlet for blowing air into the refrigerator, and an air inlet formed in the unit casing. A ventilation path communicating with the air outlet and the air outlet, a utilization side heat exchanger of the refrigerant circuit that is arranged in the ventilation path and partitions the ventilation path freely, and upstream of the utilization side heat exchanger in the ventilation path in the ventilation direction And a drain pan disposed on the downstream side in the ventilation direction of the use side heat exchanger in the ventilation path and receiving drain water dripped from the use side heat exchanger. In the use side unit of the refrigeration apparatus configured to perform a defrosting operation for removing frost attached to the surface of the exchanger, the use side heat exchanger is placed in an upright posture and Are those located in the most of the blower closer position on Npan.

In the use side unit of the refrigeration apparatus according to the present invention, the use side heat exchanger is placed in an upright posture and disposed at a position closest to the blower on the drain pan. Even farther from the air outlet. Thereby, even if dew pops out from the use side heat exchanger, it is received on the drain pan on the way. Accordingly, it is possible to prevent dew popping from the unit casing during the defrosting operation. As a result, it is possible to prevent the stored item in the refrigerator from being attached with water and losing its commercial value or causing the worker in the refrigerator to feel uncomfortable.

It is a side block diagram which shows the inside of the utilization side unit of the freezing apparatus in Embodiment 1 of this invention. It is a disassembled perspective view which shows the principal part of the utilization side unit of the said freezing apparatus. It is a block diagram which shows the refrigerant circuit of the said freezing apparatus. It is a figure of the graph which shows the relationship between the cooling capacity of the said freezing apparatus, and the amount of frost in a use side heat exchanger. It is a figure which shows the relationship between the distance from the air blowing outlet in the said use side unit to the utilization side heat exchanger, and the fan air volume which does not dew. It is plane state explanatory drawing which shows the state of the blowing air when the air volume dispersion | distribution board is not arrange | positioned in the fan blowing outlet of the sirocco fan in the utilization side unit of the refrigeration apparatus in Embodiment 2 of this invention. It is plane state explanatory drawing which shows the state of the blowing wind at the time of arrange | positioning the air volume dispersion | distribution board in front of the fan blowing outlet of a sirocco fan in the utilization side unit in Embodiment 2 of this invention. It is a partial side surface explanatory view showing the flow state of the wind when the lower part of the use side heat exchanger is not blocked by the use side unit of the refrigeration apparatus in Embodiment 3 of the present invention. It is a partial side surface explanatory drawing which shows the flow state of the wind at the time of plugging the downward direction of a utilization side heat exchanger with the utilization side unit in Embodiment 3 of this invention. It is a figure which shows the principal part inside the utilization side unit of the refrigeration apparatus in Embodiment 4 of this invention, Comprising: (a) is the case where the clearance gap between the sheet metal for water conveyance and a drain pan is obstruct | occluded with the one support plate over the whole left-right direction. (B) is a side block diagram corresponding to (a). It is a figure which shows the principal part inside the utilization side unit in Embodiment 4 of this invention, Comprising: (a) is the case where the clearance gap between the sheet metal for water conveyance and a drain pan is filled with the space | interval in the left-right direction with several support plates. (B) is a side block diagram corresponding to (a). It is a side block diagram which shows the inside of the utilization side unit of the freezing apparatus in Embodiment 5 of this invention. It is a side block diagram which shows the inside of the utilization side unit of a general freezing apparatus.

Embodiment 1 FIG.
FIG. 1 is a side configuration diagram showing the inside of a use side unit of a refrigeration apparatus in Embodiment 1 of the present invention, and FIG. 2 is an exploded perspective view showing a main part of the use side unit of the refrigeration apparatus.
In each figure, the use side unit 1 includes a rectangular box-shaped unit casing 1A having an air inlet 25 for sucking air in the space K to be cooled and an air outlet 26 for blowing air into the space K to be cooled. A heat passage 27 formed in the unit casing 1A for communicating the air inlet 25 and the air outlet 26, and a use side heat exchange of the refrigerant circuit 23 provided in the air passage 27 and partitioning the air passage 27 freely. The sirocco fan 3 disposed upstream of the ventilation direction (arrow L direction) of the utilization side heat exchanger 2 in the ventilation path 27, and the utilization side heat exchanger 2 in the ventilation path 27 And a drain pan 5 that receives the drain water D dripped from the use side heat exchanger 2. In the figure, reference numeral 4 denotes an air volume dispersion plate disposed at a downstream position in the ventilation direction of the fan outlet 3A of the sirocco fan 3, and 6 denotes a usage side heat exchanger disposed below the usage side heat exchanger 2. 2 is used for flowing drain water in the left-right direction (in the direction of arrow N in FIG. 2), 7a is used side heat exchange in order not to pass air between the use side heat exchanger 2 and the water guide sheet metal 6. The partition member 7b, for example, made of polyurethane foam, fixed to the downstream side in the ventilation direction on the lower surface of the vessel 2 is used on the use side heat exchanger 2 in order to prevent air from passing between the use side heat exchanger 2 and the water guide sheet metal 6. A partition member made of foamed polyurethane, for example, fixed to the upstream side of the lower surface in the ventilation direction, 8 is a support plate that supports the sirocco fan 3 and the motor 19, and 9 is disposed on the drain pan 5 to support the lower surface of the water guide metal plate 6. A support plate is shown.

The drain pan 5 is disposed so as to be inclined toward the upstream side in the ventilation direction. A drain water extraction pipe 28 is connected to the upstream end of the drain pan 5 in the ventilation direction. And the utilization side heat exchanger 2 is arrange | positioned in the upper position of the drain pan 5, and is fixedly supported by the right-and-left inner wall surface of 1 A of unit casings. Further, the use side heat exchanger 2 is arranged in an upright posture and is arranged on the drain pan 5 closest to the sirocco fan 3 (position of the use side heat exchanger 2 marked with (S) in FIG. 1). Has been. And the water guide metal plate 6 is arranged in the gap M between the use side heat exchanger 2 and the drain pan 5. The water guide sheet metal 6 is for receiving the drain water D from the use side heat exchanger 2 and then flowing it in the left-right direction (arrow N direction) to guide it to the drain pan 5. The partition members 7 a and 7 b are configured to partition the ventilation path 27 by closing the gap M between the lower surface of the use side heat exchanger 2 and the upper surface of the water guide sheet metal 6. In this example, the blower 22 of this embodiment is configured by four sirocco fans 3, 3, 3, and 3. These four sirocco fans 3, 3, 3, and 3 are juxtaposed in the horizontal direction (arrow N direction) perpendicular to the ventilation direction. Further, an air volume dispersion plate 4 is disposed at a downstream position in the ventilation direction of the air outlet 3 </ b> A of each sirocco fan 3. These air volume dispersion plates 4 are configured to disperse the air volume blown from the air outlet 3A in the left-right direction (in the direction of arrow N in FIG. 7) perpendicular to the wind direction.

FIG. 3 is a block diagram showing a refrigerant circuit 23 of the refrigeration apparatus according to this embodiment. Reference numeral 1 in the figure is a use side unit used as a load side unit as in FIG. 1, and 10 is its heat source unit. It is a heat source side unit used as. Reference numerals 11 and 12 are refrigerant pipes for connecting the use side unit 1 and the heat source side unit 10, 11 is a liquid pipe, and 12 is a gas pipe. The heat source side unit 10 includes a compressor 13, a condenser 14, a receiver 15, and an accumulator 16, and is connected to the usage side unit 1 through a liquid pipe 11, a gas pipe 12 and a refrigerant pipe 24.

  Next, the operation will be described. In the use-side unit 1 of the refrigeration apparatus configured as described above, during the cooling operation, the high-temperature and high-pressure gas refrigerant compressed by the compressor 13 exchanges heat with the outside air in the condenser 14 and is cooled and condensed. The condensed high-pressure liquid refrigerant is stored in the receiver 15 and flows through the liquid pipe 11 to the use side unit 1 side. In the use side unit 1, it passes through the liquid electromagnetic valve 17, is decompressed by the temperature-sensitive control type expansion valve 18, and becomes a low-pressure two-phase refrigerant. The low-pressure two-phase refrigerant absorbs heat from the cooling load in the refrigerator by the use-side heat exchanger 2, becomes a low-pressure gas refrigerant, passes through the gas pipe 12, and is sucked into the compressor 13 again through the accumulator 16. By this series of cycle operations, heat is absorbed from the load in the refrigerator and is dissipated to the outside air, thereby cooling the refrigerator K.

  And in the use side unit 1, the sirocco fan 3 is rotationally driven, the air in the refrigerator K is sucked from the air suction port 25 on the back side (the right side portion in FIG. 1) of the unit casing 1A, and the sucked air is used on the use side. Heat is exchanged with a cold refrigerant with the fins that are components of the heat exchanger 2, and the air whose temperature has been lowered by this heat exchange is blown out from the air outlet 26 on the front side (left side portion in FIG. 1) of the use side unit 1. Thus, the refrigerator K is cooled.

  At this time, the temperature of the refrigerant passing through the refrigerant pipe of the use side heat exchanger 2 is about 10 to 15 K lower than the temperature inside the refrigerator K, and the evaporation temperature when the temperature inside the refrigerator K is 0 ° C. is When the temperature in the refrigerator K is 10 ° C., the evaporation temperature is about −5 ° C. to 0 ° C. Moreover, the temperature of the surface of the fin of the use side heat exchanger 2 is also lowered to a temperature close to the evaporation temperature of the refrigerant passing through the refrigerant pipe of the use side heat exchanger 2. For example, when the surface temperature of the use side heat exchanger 2 becomes 0 ° C. when the intake air temperature is 10 ° C. and the relative humidity is about 50% or less, the surface temperature of the use side heat exchanger 2 becomes lower than the dew point temperature. Therefore, the moisture contained in the suction air adheres to the surface of the use-side heat exchanger 2 as dew, then freezes and becomes frost, and adheres to the fins of the use-side heat exchanger 2. When this is repeated, the amount of frost on the fin surface of the use side heat exchanger 2 increases, the air path between the fins of the use side heat exchanger 2 becomes narrow, and the air volume decreases, or the use side heat exchanger 2 Frost on the fin surface hinders heat exchange between air and refrigerant. That is, as shown in the graph of FIG. 4, when the amount of frost in the use-side heat exchanger 2 increases, the cooling capacity of the refrigeration apparatus decreases, so this refrigeration apparatus must be periodically defrosted. It must be.

  The defrosting operation for removing the frost adhering to the surface of the use side heat exchanger 2 is used in the use side heat exchanger 2 when used in a relatively low temperature region such as a temperature in the refrigerator K of 0 ° C. or lower. The defrosting operation is performed by heating with the attached heater. On the other hand, when the temperature in the refrigerator K exceeds 0 ° C., the air temperature in the refrigerator K is higher than the temperature at which the frost melts, so that the heater is not used and the liquid electromagnetic valve 17 in the refrigerant circuit 23 is closed when the temperature is closed. With the machine 13 stopped and the low-temperature refrigerant passing through the refrigerant pipe of the usage-side heat exchanger 2 ceased, only the sirocco fan 3 is rotated and continuously blown to the usage-side heat exchanger 2 to use the usage-side heat exchange. The off-cycle defrost operation of melting the frost by applying a wind of 0 ° C. or higher to the frost attached to the fin surface of the vessel 2 is performed.

  When defrosting is performed by this off-cycle defrost operation, defrosting is performed using a wind of 0 ° C. or higher. However, when the fan air volume of the sirocco fan 3 is large, the melted frost becomes water droplets and the use side heat exchanger 2 It will jump out of the utilization side unit 1 from the fin through the air outlet 26. Therefore, it is necessary to reduce the fan air volume of the sirocco fan 3 to an air volume that does not generate dew. On the other hand, when the fan air volume of the sirocco fan 3 is low, it takes time to complete the defrosting of the use side heat exchanger 2. That is, it takes a long time to restart the cooling operation, and the temperature in the refrigerator increases. Further, since the fan air volume is small, the cooling capacity is reduced, which causes a problem that the cooling of the refrigerator is hindered.

On the other hand, in the usage-side unit 1 of the first embodiment, the usage-side heat exchanger 2 is placed in an upright posture so that the distance P between the air outlet 26 and the usage-side heat exchanger 2 is increased. Since it is arranged at a distant position (S), that is, a position closest to the sirocco fan 3 on the drain pan 5, even if the dew D1 jumps out from the use side heat exchanger 26, the dew D1 is deposited on the drain pan 5 on the way It can be received. As shown in the graph of FIG. 5, when the distance P from the air outlet 26 to the use side heat exchanger 2 is increased, the fan air volume does not dew even if it increases. In the case of this Embodiment 1, since the wind speed is about 2.7 m / s, the distance P from the air outlet 26 should just ensure about 200 mm.

Embodiment 2. FIG.
Although only the first embodiment does not cause the outside of the usage-side unit 1 to be exposed, a mode in which the exposure can be prevented even when the fan air volume is further increased will be described in the second embodiment.
In general, a sirocco fan has a characteristic of blowing out a blowing air in a straight line. For this reason, the portion 2C of the usage-side unit 1 where the fan outlet 3A of the sirocco fan 3 is located in front has a higher wind speed than the portion 2D where the fan outlet 3A is not located in front, so that the problem is that it is more easily exposed. is there. In order to solve this problem, the wind speed distribution in the left-right direction (arrow N direction) of the use-side heat exchanger 2 can be made more uniform by disposing the air volume dispersion plate 4 at the fan outlet 3A. In the case of this embodiment, the angle of the air volume dispersion plate 4 is inclined by 65 degrees from the blowing direction (arrow L direction), and the left-right distance of the portion where the air volume dispersion plate 4 is not in front is set to about 20.5 mm. Moreover, the air volume dispersion | distribution board 4 was arrange | positioned in the position of about 20 mm downstream from the fan blowing outlet 3A with respect to the distance 90mm from the fan blowing outlet 3A to the utilization side heat exchanger 2. FIG. FIG. 6 is a plan view showing a state of the blown air from the sirocco fan 3 in a mode in which the air volume dispersing plate 4 is not provided at the front position of the fan blowing port 3A, and FIG. 7 is a plan view showing the air volume dispersing plate 4 of the fan blowing port 3A. It is a plane block diagram showing the state of the blowing wind from the sirocco fan 3 in the aspect deployed at the front position.

  When the sirocco fan 3 and the motor 19 are of different combinations, or when the arrangement of the sirocco fan 3 is not equal to the left and right, a part 2C where the fan outlet 3A is in front of the use side heat exchanger 2; By changing the direction of the air volume dispersion plate 4 and the size of the air volume dispersion plate 4 from the ratio of the left and right dimensions with the part 2D that is not in front, the wind speed can be made uniform. In the case of the second embodiment, the size of the air volume dispersion plate 4 is determined and arranged according to the left and right dimensions of the portion 2C where the fan outlet 3A is not in front and the size of the fan outlet 3A. Moreover, the direction of the air volume dispersion | distribution board 4 was determined by the left-right dimension ratio of the site | part 2D in which the fan blower outlet 3A does not exist in the front in the utilization side heat exchanger 2. FIG. For example, in the usage-side heat exchanger 2, when the left and right dimensions of the portion 2D where the fan outlet 3A is not in front is about 200 mm, the air volume dispersion plate 4 is four, and when the left and right dimension is about 100 mm, the air volume dispersion plate 4 is used. By using two sheets, the wind blows evenly on the part 2D where the fan outlet 3A is not in front.

As described above, in the use-side heat exchanger 2, the airflow distribution is uniformized between the part where the fan outlet of the sirocco fan is in front and the part where the fan outlet is not in front. The wind speed of the part which was large can be suppressed to the wind speed which does not fly out. Thereby, since all the winds which hit a utilization side heat exchanger become a wind speed which does not dew, dew can be suppressed further. That is, the blower 22 is composed of a plurality of sirocco fans 3, 3, 3,... That are spaced apart from each other, and the respective fan outlets 3A are separated from each other left and right and are blown out from the respective outlets 3A. Even if the blown air has straight travel characteristics and the air volume and the wind speed are difficult to be uniform in the left-right direction, the wind hitting the use-side heat exchanger 2 can be reduced by the arrangement of the air volume dispersing plates 4, 4, 4,. Because it has become uniform, the user-side heat exchanger is uniformly blown, and the frost remaining of the user-side heat exchanger can be prevented at the time of defrosting, and the ability of the user-side heat exchanger 2 can be fully exerted when the cooling operation is resumed. Moreover, the effect that the defrosting time can be shortened is also obtained.

Embodiment 3 FIG.
Although only the first and second embodiments can eliminate dew from the use-side heat exchanger 2, an improvement mode in the case where dew is generated from the lower side of the use-side heat exchanger 2 is implemented. This will be described in Embodiment 3.
The internal structure of the usage-side unit shown in FIG. 8 is that the usage-side heat exchanger 2 is placed between the lower side of the usage-side heat exchanger 2 and the water guide sheet 6 disposed below the usage-side heat exchanger 2. It shows the case where there is nothing to prevent the wind passing through. In such a structure, when the use side heat exchanger 2 is blocked by frost and there is no wind passing through the use side heat exchanger 2, the air blown out from the sirocco fan 3 flows under the use side heat exchanger 2. Pass through. When the off-cycle defrost operation is performed in this state, it starts to melt from the frost adhering to the upstream side in the ventilation direction of the use side heat exchanger 2, partly becomes dew D <b> 1, partly becomes a lump of ice, and the sheet metal for water conveyance It falls on 6. At the start of the off-cycle defrost operation, since the use side heat exchanger 2 is clogged with frost, the use side heat exchanger 2 has no air path and passes below the use side heat exchanger 2 which is the only passage. The wind speed is about 2 to 3 times higher than the state where the use side heat exchanger 2 is not frosted, and the dew D1 and the ice block that have fallen on the water guide metal plate 6 below the use side heat exchanger 2 are further increased. Since it becomes easy to fly, it is discharged from the air outlet 26 to the outside of the usage-side unit 1.

Therefore, as shown in FIG. 9, partition members 7 a and 7 b that close the gap M and partition the ventilation path 27 are provided in the gap M between the use-side heat exchanger 2 and the water guide metal plate 6. Thereby, the wind which passes through the downward direction of the use side heat exchanger 2 can be eliminated, and the wind passing through other than the use side heat exchanger 2 can be eliminated. As a result, since the air can be passed only through the use side heat exchanger 2 when the cooling operation is resumed, the ability of the use side heat exchanger 2 can be efficiently exhibited.

Embodiment 4 FIG.
In the first, second, and third embodiments, drain water D accumulates between the lower part on the downstream side in the ventilation direction of the use side heat exchanger 2 and the drain pan 5, and the accumulated drain water D passes through the use side heat exchanger 2. A case where it is wound up by the wind and discharged outside the usage-side unit 1 can be considered. An improvement method in such a case will be described in the fourth embodiment.
As shown in FIG. 10, when the support plate 9 of the water guide metal plate 6 disposed below the use side heat exchanger 2 blocks all the bottom of the use side heat exchanger 2, the use side heat exchanger 2 to the drain pan 5 The dew D1 that has fallen on the blowout side is sometimes pushed by the wind that has passed through the use side heat exchanger 2 and collected in the drain pan 5. When the drain water D collected in the drain pan 5 increases, it may ride on the wind passing through the use side heat exchanger 2 and be discharged from the air outlet 26 to the outside of the use side unit 1.

Therefore, as shown in FIG. 11, the support plate 9 of the water guide metal plate 6 arranged below the use side heat exchanger 2 is not arranged over the entire lower surface of the use side heat exchanger 2, A plurality of support plates 9, 9, 9,... Supporting the lower surface are disposed on the bottom surface 5 </ b> A of the drain pan 5 in an arrangement spaced apart in the left-right direction (arrow N direction). A gap Q for passing water is formed between the adjacent support plates 9 and 9. As described above, the drain water D that has fallen to the downstream side in the ventilation direction of the use side heat exchanger 2 of the drain pan 5 is kept at that position by arranging the gaps Q, Q, Q,. Without draining, the drain pan 5 can be discharged to the upstream side in the ventilation direction. As a result, it is possible to prevent the drain water D from stagnating on the downstream side of the drain pan 5 in the ventilation direction, and the drain water D riding on the blowing air and being discharged out of the use side unit 1.

Embodiment 5 FIG.
In said Embodiment 1-4, although the example which provided the sheet metal 6 for water conveyance between the utilization side heat exchanger 2 and the drain pan 5 was shown, this invention is not limited to it. For example, as shown in FIG. 12, a use side unit that does not have the water guide sheet metal 6 is also included in the present invention. In this use side unit, partition members 7 a and 7 b are provided in the gap M between the use side heat exchanger 2 and the drain pan 5, and these are attached to the front and back positions of the lower surface of the use side heat exchanger 2. Even with such a configuration, the wind does not pass under the use side heat exchanger 2 and the wind can pass only between the fins of the use side heat exchanger 2. Further, the partition members 7a and 7b are made of a material that allows water to pass, such as foamed polyurethane or foamed polyethylene, so that the drain water D on the drain pan 5 passes through the partition members 7a and 7b and is discharged outside the apparatus. be able to.

DESCRIPTION OF SYMBOLS 1 User-side unit 1A Unit casing 2 User-side heat exchanger 2C part 2D part 3 Sirocco fan 3A Fan outlet 4 Air volume distribution plate 5 Drain pan 6 Sheet metal 7a Partition member 7b Partition member 9 Support plate 22 Blower 23 Refrigerant circuit 25 Air Air inlet 26 Air outlet 27 Ventilation path D Drain water D1 Dew K Refrigerator L Arrow M Clearance N Arrow P Distance Q Clearance S Position

Claims (5)

A unit casing having an air inlet for sucking air in the refrigerator and an air outlet for blowing air into the refrigerator, and the air inlet and the air outlet formed in the unit casing communicate with each other A ventilation path, a utilization side heat exchanger of a refrigerant circuit that is arranged in the ventilation path and partitions the ventilation path so as to be freely ventilated, and is disposed upstream of the utilization side heat exchanger in the ventilation direction in the ventilation path. A fan and a drain pan disposed on the downstream side in the ventilation direction of the use side heat exchanger in the ventilation path and receiving drain water dripped from the use side heat exchanger, the use side heat exchange. In the use side unit of the refrigeration apparatus configured to perform a defrosting operation for removing frost attached to the surface of the cooler, the use side heat exchanger is in an upright posture. , The use-side unit of a refrigeration apparatus, characterized in that it is arranged at a position of most the blower close on the drain pan. 2. An air volume dispersion plate that disperses an amount of air blown from the blowout opening in a horizontal direction perpendicular to the airflow direction is provided at a position downstream of the blowout opening of the blower. A use side unit of the refrigeration apparatus described. The utilization side heat exchanger is disposed at a position above the drain pan, and a partition member is disposed in a gap between the utilization side heat exchanger and the drain pan to close the gap and partition the ventilation path. The utilization side unit of the refrigeration apparatus of Claim 1 or Claim 2. The drain pan is inclined to the upstream side in the ventilation direction, and receives drain water from the use side heat exchanger between the use side heat exchanger and the drain pan, and then in a horizontal direction perpendicular to the ventilation direction. A water guide plate for flowing and guiding the drain plate is provided, and a plurality of support plates that support the water guide plate are spaced apart from each other in a horizontal direction perpendicular to the ventilation direction on the drain pan. The utilization side unit of the freezing apparatus as described in any one of Claim 1- Claim 3. The blower is composed of two or more sirocco fans, and the two or more sirocco fans are arranged side by side in a horizontal direction perpendicular to the ventilation direction. A use side unit of the refrigeration apparatus according to the item.

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