JP7325323B2 - air conditioner - Google Patents

Description

TECHNICAL FIELD The present invention relates to an air conditioner, and relates to a technology of a heat pump type air conditioner that supplies cold air or warm air in a spot manner.

2. Description of the Related Art Conventionally, there is an air conditioner described in Patent Document 1, for example. This system has a cooler that cools the air sucked into the air conditioner main body so that it can be inserted into and removed from the main body of the air conditioner. When the amount of water reaches a predetermined amount or more, the operation of the cooling device is stopped. The evaporator and the condenser are integrated, and environmental air around the apparatus is taken in, cooling air is supplied from the evaporator side, and waste heat is discharged from the condenser side.

Moreover, there exists a thing described in the patent document 2. FIG. This is a local cooling type air conditioner that cools the air taken in from the air intake port of the air conditioner body by the evaporator of the refrigeration circuit, and blows this air to an arbitrary air conditioning position through the blow-out duct provided in the air conditioner body. An air recirculation passage is provided for returning a portion of the air flowing out of the evaporator to the air inlet side of the evaporator.

Actual Kaihei 6-40727 Actual Kaihei 6-59724

In the configuration of Patent Document 1, when the temperature load of the ambient air sucked into the air conditioner main body increases, the blowing temperature of the cold air blown out from the device rises, and the performance limit for protection occurs, and sufficient No cooling effect.

Further, in the configuration of Patent Document 2, the supply air temperature can be lowered by returning part of the air that has flowed out of the evaporator to the air inflow side of the evaporator. However, since only the surrounding ambient air flows into the condenser, when the temperature load of the ambient air increases, the refrigerant cannot be sufficiently condensed, and as a result, the blowing temperature of the cold air blowing out from the device increases, and the protection Due to the limited capacity, a sufficient cooling effect cannot be exhibited.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems, and to provide an air conditioner that can sufficiently control the temperature of supply air to the required temperature even if the temperature load of the environmental air around the device increases. and

In order to solve the above problems, an air conditioner according to the present invention has an evaporating unit and a condensing unit arranged in a casing, the inlet sides of both communicating in the casing, and the outlet side of the evaporating unit passing through the evaporating unit. It has an air supply port through which the supplied air blows out, an exhaust port through which the exhaust air that has passed through the condensation unit blows out on the outlet side of the condensation unit, and an ambient air around the casing is provided between the inlet sides of both the evaporation unit and the condensation unit. is in communication with the supply air return path in which part of the supply air is returned , the supply air return path branches in the middle, one branch path communicates with the inlet side of the evaporation unit, and the other branch path communicates with the inlet side of the evaporation unit. is connected to the inlet side of the condensing unit, and a distribution device for distributing the recirculated supply air to one branch path and the other branch path is interposed in the supply air return path.

The air conditioner according to the present invention is characterized in that an air volume adjusting device is interposed in the middle of the supply air circulation path.

In the air conditioner according to the present invention, the casing is provided with two air supply ports for supplying air, the air is blown out from one of the air supply ports, and the other air supply port communicates with the supply air return path. do.

As described above, according to the present invention, by supplying a part of the supply air cooled through the evaporation unit to the inlet side of the evaporation unit and the condensation unit, the temperature of the inlet air in the evaporation unit and the condensation unit is increased to descend. As a result, it is possible to alleviate the inlet temperature of the ambient air flowing into the evaporating unit and the condensing unit even under capacity-restricted conditions (supply air temperature must be suppressed), thereby avoiding the capacity limitation of suppressing the supply air temperature.

In addition, it is possible to adjust the amount of supplied air to be circulated by the air volume adjustment device, or to adjust the ratio of the amount of supplied air to be circulated to the evaporating unit and the amount of supplied air to be circulated to the condensing unit by the distribution device. When the load is low, the recirculation of the charge air can be stopped, or when it is desired to lower the temperature of the charge air blowing into the surroundings, the recirculation of the charge air to the condensation unit is suppressed or stopped, and the return of the charge air to the evaporator unit is reduced. By increasing the reflux, it is possible to reduce the supply air temperature. That is, it is possible to maintain the capacity of the condensation unit while lowering the blowout temperature of the supply air.

Schematic diagram showing an air conditioner according to an embodiment of the present invention Front view showing an air conditioner according to another embodiment of the present invention Sectional view of the air conditioner in the same embodiment FIG. 1 is a psychrometric diagram showing changes in air when air supply is not circulated in the air conditioner according to the embodiment of the present invention. FIG. 1 is a psychrometric diagram showing changes in air when supplied air is returned to an evaporating unit and a condensing unit in an air conditioner according to an embodiment of the present invention; FIG. 2 is a psychrometric diagram showing changes in air when supplied air is recirculated only to the evaporation unit in the air conditioner according to the embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, an air conditioner 1 according to the present invention has an evaporating unit 3 and a condensing unit 4 inside a casing 2 . The evaporating unit 3 and the condensing unit 4 are arranged so that their inlet sides face each other, and both inlet sides communicate with each other through the inner space of the casing 2 .

The evaporation unit 3 has an evaporator 3a and a fan device 3b, and the condensation unit 4 has a compressor 4a, a condenser 4b and a fan device 4c.

One side of the casing 2 has an air supply port 6 through which the supply air 5 that has passed through the evaporation unit 3 blows out, and the other side of the casing 2 has an exhaust port 8 through which the exhaust air 7 that has passed through the condensation unit 4 blows out. ing.

Between the inlet sides of both the evaporating unit 3 and the condensing unit 4, there are an ambient air inflow path 10 into which the ambient air 9 around the casing 2 flows, and a supply air return path 12 in which part of the supply air 5 is circulated. are in communication.

The environmental air inflow passage 10 is an upper space 13 of the casing 2 that communicates the inlet sides of both the evaporating unit 3 and the condensing unit 4 . Communicate with the environment.

The air supply return path 12 includes a duct flow path 16 of a duct 15 provided to cover the front of the air supply port 6, and a front flow path 18 and a rear flow path 19 partitioned by a partition plate 17 provided inside the casing 2. consists of The duct 15 is provided with an outlet 20 for blowing out the supplied air 5 to the outside of the apparatus.

The partition plate 17 divides the lower space of the casing 2 into front and rear spaces to form a branch path. The front channel 18, which is one branch channel on the front side of the casing 2, communicates with the inlet side of the evaporation unit 3, and the other branch channel 19, which is the other branch channel on the rear side of the casing 2, communicates with the inlet side of the evaporation unit 3. It communicates with the inlet side of the condensation unit 4 . Both the front channel 18 and the rear channel 19 communicate with the upper space 13 .

The supply air circulation path 12 has an air volume adjusting device 21 interposed between the duct flow path 16 and the front flow path 18, and a distribution device 22 interposed between the front flow path 18 and the rear flow path 19. there is The air volume adjusting device 21 adjusts the ratio of the amount of externally supplied air blown out to the outside of the apparatus and the amount of recirculated supplied air returned to the inside of the casing 2 . The distribution device 22 divides the recirculated supply air 5 into a ratio between a first distribution amount that leads to the inlet side of the evaporating unit 3 through the front channel 18 and a second distribution amount that leads to the inlet side of the condensation unit 4 through the rear channel 19. is adjusted.

In the above configuration, the environmental air 9 enters the environmental air inlet passage 10 from the environmental air inlet 14 and flows into the evaporating unit 3 and the condensing unit 4 .

The evaporator unit 3 cools the air with an evaporator 3a, and the supply air 5 that has passed through the evaporator unit 3 is sent out to the surrounding environment with a fan device 3b. The condensation unit 4 compresses the refrigerant with the compressor 4a, cools and condenses the refrigerant with the condenser 4b, and discharges the exhaust air 7 that has passed through the condensation unit 4 to the surrounding environment with the fan device 4c.

The supply air 5 is blown out of the apparatus through the air supply port 6 and the blowout port 20, part of which is returned to the inside of the casing 2 through the supply air return path 12, and flows into the evaporation unit 3 and the condensation unit 4 together with the environmental air 9. .
(Supply air recirculation stop)
FIG. 4 is a psychrometric chart showing changes in the state of the air when the supply air 5 is not circulated to the inlet sides of the evaporation unit 3 and the condensation unit 4 .

The air volume adjustment device 21 adjusts the external air supply amount of the air supply 5 blown out to the outside of the apparatus to 100%, and adjusts the recirculation air supply amount of the air supply 5 to be circulated inside the casing 2 to be eliminated.

In this case ambient air 9 enters at 220 m ³ /min, enters the inlet side of the evaporation unit 3 at 80 m ³ /min and enters the inlet side of the condensation unit 4 at 140 m ³ /min. Then, the supply air 5 is blown out at 80 m ³ /min, and the exhaust air 7 is discharged outside at 140 m ³ /min.

The ambient air 9 is indicated on the psychrogram by (1) and the supply air 5 is indicated on the psychrogram by (2). That is, the ambient air 9 with a dry bulb temperature of 35° C., an absolute humidity of 0.0193 kg/kg (DA), and a relative humidity of about 54% passes through the air conditioner 1, resulting in a dry bulb temperature of 22° C. and an absolute humidity of 0.016 kg/kg/kg. kg (DA) and cooled to supply air 5 with a relative humidity of the order of 95%.
(Return of supplied air)
FIG. 5 is a psychrometric chart showing changes in the state of the air when the supply air 5 is recirculated to the inlet sides of the evaporation unit 3 and the condensation unit 4 .

The air volume adjustment device 21 adjusts the external supply amount of the supply air 5 blown out to the outside of the apparatus to 50% and the return supply amount of the supply air 5 returned to the inside of the casing 2 to 50%.

The distribution device 22 arranges for distribution of 50% of the recirculated charge 5 to the inlet side of the evaporation unit 3 and 50% of the recirculated charge 5 to the inlet side of the condensation unit 4 .

In this case ambient air 9 enters at 180 m ³ /min, charge air 5 leaves at 80 m ³ /min and 40 m ³ /min of charge air 5 returns. The recirculated supply air 5 and ambient air 9 enter the inlet side of the evaporation unit 3 at 80 m ³ /min and the inlet side of the condensation unit 4 at 140 m ³ /min.

Then, the supply air 5 is blown out at 40 m ³ /min, and the exhaust air 7 is discharged outside at 140 m ³ /min.

The environmental air 9 is indicated by (1) on the psychrometric diagram, the supply air 5 is indicated by (2) on the psychrometric diagram, and the air in which the recirculating supply air 5 joins the environmental air 9 is (3), (4).

That is, the environmental air 9 with a dry bulb temperature of 35 ° C., an absolute humidity of 0.0193 kg / kg (DA), and a relative humidity of about 54% joins the recirculating supply air 5 to form a dry bulb temperature of about 32.7 ° C. and an absolute humidity of about 32.7 ° C. Air with a relative humidity of about 0.0187 kg/kg (DA) and a relative humidity of about 60% flows into the inlet side of the evaporation unit 3 and the condensation unit 4, resulting in a dry bulb temperature of 21°C and an absolute humidity of 0.0148 kg/kg ( DA), cooled to supply air 5 with a relative humidity of the order of 95%.
(Partial stop of recirculation of supply air)
FIG. 6 is a psychrometric diagram showing changes in the state of the air when the supplied air 5 is recirculated only to the inlet side of the evaporation unit 3. As shown in FIG.

The air volume adjustment device 21 adjusts the external supply amount of the supply air 5 blown out to the outside of the apparatus to 50% and the return supply amount of the supply air 5 returned to the inside of the casing 2 to 50%.

The distributor 22 arranges to distribute 100% of the recirculated charge 5 to the inlet side of the evaporation unit 3 .

In this case ambient air 9 enters at 180 m ³ /min, charge air 5 leaves at 80 m ³ /min and 40 m ³ /min of charge air 5 returns. The recirculated supply air 5 and the ambient air 9 flow into the inlet side of the evaporation unit 3 at 80 m ³ /min, and only the ambient air 9 flows into the inlet side of the condensation unit 4 at 140 m ³ /min.

Then, the supply air 5 is blown out at 40 m ³ /min, and the exhaust air 7 is discharged outside at 140 m ³ /min.

The environmental air 9 is indicated by (1) on the psychrometric diagram, the supply air 5 is indicated by (2) on the psychrometric diagram, and the air in which the recirculating supply air 5 joins the environmental air 9 is indicated by (3). showing.

That is, the environmental air 9 with a dry bulb temperature of 35 ° C., an absolute humidity of 0.0193 kg / kg (DA), and a relative humidity of about 54% joins the recirculating supply air 5 to form a dry bulb temperature of about 28.6 ° C. and an absolute humidity of about 28.6 ° C. Air with a relative humidity of about 0.0176 kg/kg (DA) and a relative humidity of about 71% flows into the inlet side of the evaporation unit 3, resulting in a dry bulb temperature of 19.3°C and an absolute humidity of 0.0134 kg/kg (DA). , the supply air 5 having a relative humidity of the order of 95%.

That is, in the configuration of FIG. 4, the environmental air 9 is 220 m ³ /min, the dry bulb temperature of the supply air 5 is 22° C., the absolute humidity is 0.016 kg/kg (DA), and the relative humidity is about 95%. In the configuration, the ambient air 9 is 180 m ³ /min, the supply air 5 has a dry bulb temperature of 21° C., an absolute humidity of 0.0148 kg/kg (DA), and a relative humidity of about 95%. 5 has a dry bulb temperature of 19.3° C., an absolute humidity of 0.0134 kg/kg (DA), and a relative humidity of about 95%.

As described above, according to the present embodiment, part of the supply air 5 cooled through the evaporation unit 3 is supplied to the inlet sides of the evaporation unit 3 and the condensation unit 4, thereby flowing into the casing 2. The ambient air 9 can be suppressed from 220 m ³ /min to 180 m ³ /min, and the temperature of the inlet air in the evaporating unit 3 and the condensing unit 4 is lowered.

As a result, it is possible to alleviate the inlet temperature of the ambient air 9 flowing into the evaporating unit 3 and the condensing unit 4 even under the condition of capacity limitation (requiring suppression of the supply air temperature), thereby avoiding the capacity limitation of suppressing the supply air temperature.

In addition, the amount of supplied air to be circulated can be adjusted by the air volume adjustment device 21, or the ratio of the amount of supplied air to be circulated to the evaporation unit 3 and the amount of supplied air to be circulated to the condensation unit 4 can be adjusted by the distribution device 22. When the temperature load of the environmental air 9 is low, the recirculation of the supply air 5 can be stopped, or when the temperature of the supply air 5 blown out to the surroundings is desired to be lowered, the recirculation of the supply air 5 to the condensation unit 4 is suppressed or stopped. By increasing the recirculation of the supply air 5 to the evaporation unit 3, the temperature of the supply air can be reduced. That is, it is possible to maintain the capacity of the condensation unit 3 while lowering the blowout temperature of the supply air 5 .
(Other embodiments)
In this embodiment, as shown in FIGS. 2 and 3, the casing 2 is provided with two air supply ports 61 and 62 for the air supply 5, and the air supply 5 is blown out from one air supply port 61, and the other , the air supply port 62 communicates with the air supply return path 12 . Members having the same functions as those in the previous embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.

According to this embodiment, the amount of supplied air blown out and the amount of supplied air recirculated can be independently controlled. Other functions and effects are the same as those of the previous embodiment.

1 air conditioner 2 casing 3 evaporation unit 4 condensation unit 3a evaporator 3b fan device 4 condensation unit 4a compressor 4b condenser 4c fan device 5 air supply 6, 61, 62 air supply port 7 exhaust 8 exhaust port 9 environmental air 10 Environmental air inlet channel 12 Supply air circulation channel 13 Upper space 14 Environmental air inlet 15 Duct 16 Duct channel 17 Partition plate 18 Front channel 19 Rear channel 20 Blow-out port 21 Air volume adjustment device 22 Distribution device

Claims (3)

arranging an evaporating unit and a condensing unit in a casing, both inlet sides communicating in the casing,
The outlet side of the evaporating unit has an air supply port for blowing out the air that has passed through the evaporation unit, and the outlet side of the condensation unit has an exhaust port for blowing out the exhaust air that has passed through the condensation unit. Between the inlet side, an environmental air inflow passage into which the environmental air around the casing flows and a supply air return passage in which a part of the supply air is circulated are communicated,
The supply air return path branches in the middle, one branch path communicates with the inlet side of the evaporating unit, the other branch path communicates with the inlet side of the condensation unit, and the returning supply air is connected to the one branch path and the other branch path. 1. An air conditioner characterized in that a distribution device for distribution to branch passages is interposed in a supply air circulation passage. 2. The air conditioner according to claim 1, further comprising an air volume adjusting device interposed in the middle of the supply air circulation path. 3. The apparatus according to claim 1, wherein the casing is provided with two air supply ports for supplying air, one of the air supply ports blows off the air supply, and the other air supply port communicates with the air supply return path. Air conditioner.

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