JP2009198022A - Heat pump type air conditioning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump type air conditioning device having a defrosting structure capable of performing quick defrosting without being affected by a circumferential air temperature and without distributing the cold air into an air-conditioned room. <P>SOLUTION: This heat pump type air conditioning device which is provided with a supply air flow channel 4 from an outside air inlet 2 to an air supply opening 3, and a return air flow channel 7 from an air return opening 5 of the air-conditioned room to an exhaust opening 6 in a casing 1, and in which a refrigerant from a compressor 14 is switched to an air supply side heat exchanger 9 disposed in the supply air flow channel 4 and a return air side heat exchanger 12 disposed in the return air flow channel 7 to perform a cooling operation and a heating operation, further includes a drain pan 20a disposed at a lower part of the supply air side heat exchanger 9, a water storage tank 21 for storing the water, and a water supplying means 24 for supplying the water stored in the water storage tank 21 to the circumference of the return air side heat exchanger 12 in the cooling operation for removing frost generated on the return air side heat exchanger 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat pump type air conditioner that can selectively perform a cooling operation and a heating operation by switching operation of a refrigerant circuit, and in particular, returns air without flowing cold air into the air-conditioned room during the cooling operation. The present invention relates to a heat pump air conditioner that can rapidly perform defrosting around a side heat exchanger.

In the outside air introduction type heat pump type air conditioner, the air supply side heat exchanger acts as an evaporator during cooling operation, and excess water in the introduced outside air is condensed by cooling, and the condensed moisture is externally supplied as drain water. (For example, refer to Patent Document 1 and Patent Document 2). Moreover, the condensed water discharged | emitted outside is the present condition that it is not utilized especially.
Japanese Patent No. 3945301 JP 2003-42479 A

By the way, the outside air introduction type heat pump type air conditioner generates frost on the fin surface of the evaporator in the return air side heat exchanger during heating operation , and is easy to freeze. If frost adheres to the fin surface thickly and freezes, the air passage becomes narrow and the air volume decreases. At the same time, since the heat conductivity of frost is small, heat transfer is hindered, the evaporation pressure and the evaporation temperature are lowered, the capacity of the compressor is reduced, and cooling is poor.

  Therefore, conventionally, in order to prevent defrosting and freezing, a defrosting method called a hot gas method in which high-temperature refrigerant gas discharged from a compressor is sent to an evaporator and frost is melted by sensible heat and condensation latent heat thereof. In addition, the defrosting is performed using a defrosting method such as an off-cycle method in which the refrigerant is stopped from being fed to the evaporator and the frost is melted by the ambient air temperature.

  However, in the former defrosting by the hot gas method, although the defrosting time is short, there is a problem that cold air flows in the air-conditioned room. On the other hand, in the latter off-cycle method, cold air does not flow into the air-conditioned room, but it cannot be used when the defrost time is long and the ambient air temperature is low because air is used as the heat source.

  In order to provide a heat pump type air conditioner having a defrosting structure that can rapidly defrost without flowing cold air into the air-conditioned room and without being affected by the ambient air temperature. The technical problem which should arise arises, and this invention aims at solving this problem.

The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is characterized in that the air supply air from the outside air inlet to the air inlet to which the air supply duct of the air-conditioned room is connected is provided in the casing. A supply air side heat exchanger provided in the supply air flow path, and a return air flow path from a return air connection port connected to a return air duct from the air-conditioned room to an external exhaust port, Refrigerant from the compressor is circulated in the order of the return air side heat exchanger and the air supply side heat exchanger, or vice versa, with respect to the return air side heat exchanger provided in the return air flow path. In the heat pump type air conditioner configured to switch between the cooling operation and the heating operation, the drain pan provided below the air supply side heat exchanger, a water storage tank for storing water, and the water storage tank The cooling water is supplied around the return air heat exchanger during cooling operation, Providing a heat pump type air conditioner comprising a damping means for removing frost occurring in the exchanger.

According to this configuration, during cooling operation, water from the water storage tank is supplied around the return air side heat exchanger, and the condensation pressure of the return air side heat exchanger is reduced . During heating operation, frost generated on the return air side can be melted with water to forcibly defrost. Moreover, the defrosting process can be performed without operating the compressor and the blower and without being affected by the ambient air temperature.

  According to a second aspect of the present invention, the drain pan and the water storage tank are connected by a pipe that feeds the drain water collected by the drain pan to the water storage tank, and the return air side heat exchange is connected to the water supply means. Provided is a heat pump type air conditioner provided with an open / close control valve for controlling water supply to the vessel.

  According to this configuration, drain water such as condensed water and humidified surplus water generated on the air supply side is collected by a drain pan, stored in a water storage tank by a pipe, and the water stored in the water storage tank is returned to the return air side. Can be supplied around the heat exchanger. Further, the supply and stop of the water can be controlled by opening / closing operation of the opening / closing control valve.

  According to a third aspect of the present invention, the water supply means includes a defrost sensor for detecting a frost state of the return air side heat exchanger, and the open / close control valve in response to a frost detection signal of the defrost sensor. Provides a heat pump type air conditioner configured to open and close.

  According to this configuration, when frost formation on the return air side is detected by the defrost sensor, the open / close control valve opens to supply water in the water storage tank around the return air side heat exchanger.

  According to a fourth aspect of the present invention, there is provided a heat pump type air conditioner in which the water supply means includes a timer, and the open / close control valve is opened every time set in the timer.

  According to this configuration, the open / close control valve opens at every time set by the timer to supply the water in the water storage tank around the return air side heat exchanger.

  According to a fifth aspect of the present invention, there is provided a heat pump type air conditioner in which the water supply means has a watering nozzle that sprays and supplies water around the return air side heat exchanger.

  According to this configuration, the water in the water storage tank can be uniformly sprinkled around the return air side heat exchanger with the watering nozzle.

According to the first aspect of the present invention, during cooling operation, water from the water storage tank is supplied around the return air side heat exchanger, and the condensation pressure of the return air side heat exchanger is reduced . During the heating operation, the frost generated in the heat exchanger on the return air side is melted with water and the defrosting process is forcibly performed. Therefore, the defrosting process can be completed quickly in a short time. In addition, defrosting can be performed without operating the compressor and the blower without flowing cool air into the air-conditioned room, so that power consumption can be reduced. In addition, rapid and stable defrosting can be performed without being affected by the ambient air temperature.

According to the second aspect of the present invention, drain water such as condensed water and humidified surplus water generated on the air supply side is sent from a drain pan to a water storage tank through a pipe and stored, and the water stored in the water storage tank is opened and closed. Since it is supplied around the return air side heat exchanger by operation, the drain water generated on the supply side can be used effectively. In addition, water supply and stop operations can be easily performed by opening and closing the open / close control valve. Thereby, in addition to the effect of invention of Claim 1, the improvement of economical efficiency and the operativity can be anticipated.

  The invention according to claim 3 detects the frosting state on the return air side by the defrost sensor, opens the open / close control valve as necessary, and automatically supplies the water in the water tank around the return air side heat exchanger. Therefore, in addition to the effect of the second aspect of the invention, the defrosting process can be automated.

  In the invention according to claim 4, since the open / close control valve is opened at every time set in the timer, the water in the water tank can be automatically supplied around the return air side heat exchanger. In addition to the effects of the described invention, the defrosting process can be automated.

  In the fifth aspect of the invention, the water in the water storage tank is uniformly sprinkled around the return air side heat exchanger using the watering nozzle, so that the defrosting treatment around the return air side heat exchanger can be performed uniformly. In addition to the effects of the first, second, third, and fourth inventions, an improvement in processing accuracy in the defrosting process can be expected.

  In order to achieve the object of providing a heat pump type air conditioner having a defrosting structure capable of rapidly defrosting without flowing cool air in an air-conditioned room and without being affected by the ambient air temperature In addition, an air supply channel from the outside air inlet to the air supply port to which the air supply duct of the air-conditioned room is connected, and a return air port to which the return air duct from the air-conditioned room is connected to the external exhaust port in the casing The refrigerant from the compressor is returned to the air supply side heat exchanger provided in the air supply flow path and the air return side heat exchanger provided in the return air flow path. In the heat pump type air conditioner configured to switch between a cooling operation and a heating operation for the air-conditioned room by circulating the air side heat exchanger and the air supply side heat exchanger in the order or vice versa. Drain pan installed under the air side heat exchanger and water And a water supply means for supplying water stored in the water storage tank around the return air side heat exchanger during cooling operation to remove frost generated in the return air side heat exchanger. This was realized by the configuration.

  Hereinafter, the heat pump type air conditioner of the present invention will be described with reference to preferred embodiments.

  FIG. 1 is a system diagram showing a configuration of a heat pump type air conditioner according to the present invention. In FIG. 1, in a casing 1, an air supply passage 4 extending from an outside air inlet 2 to an air supply port 3 to which an air supply duct (not shown) of the air-conditioned room is connected, and return air from the air-conditioned room A partition plate 8 partitions a return air flow path 7 from the return air port 5 to which the duct is connected to the exhaust port 6 to the outside.

  The air supply passage 4 is provided with an air supply side heat exchanger 9, a humidifier 10, and a blower 11 in order from the outside air inlet 2 side toward the air inlet 3. In addition, a drain pan 20a is provided below the air supply side heat exchanger 9 and the humidifier 10 so as to straddle the air supply side heat exchanger 9 and the humidifier 10, and the air supply side heat exchanger 9 side is provided. The condensate generated in step 1 and excess water in the humidifier 10 can be collected by the drain pan 20a.

On the other hand, the return air flow path 7 is provided with a return air side heat exchanger 12 and a blower 13 in order from the return air port 5 toward the exhaust port 6. Further, a compressor 14 of a refrigerant circuit is provided between the return air port 5 and the return air side heat exchanger 12 in the return air flow path 7. The refrigerant from the compressor 14 is supplied by switching the supply-side heat exchanger 9 and the return-air side heat exchanger 12 in this order and vice versa by the four-way switching valve 15, and the accumulator 16 is supplied to the compressor 14. The heating operation and the cooling operation are switched by switching the four-way switching valve 15. The compressor 14, the four-way switching valve 15, and the accumulator 16 may be provided at other positions.

  In addition, a water storage tank 21 is provided on the return air flow path 7 side, and straddles the water storage tank 21, the return air side heat exchanger 12, the accumulator 16, the compressor 14, and the four-way switching valve 15. A drain pan 20b is provided so that condensed water or the like generated on the return air side heat exchanger 12 side can be collected by the drain pan 20b. Further, a defrost sensor 23 for detecting frost generated on the return air side heat exchanger 9 side is attached to the return air side heat exchanger 12.

The other end of a drain hose 22a having one end connected to the bottom of the drain pan 20a is connected to the water storage tank 21 via a partition plate 8, and the drain water collected by the drain pan 20a is stored in the water storage tank 21. It can be stored by natural fall. Further, surplus water is discarded from the drain hose 22b having one end connected to the bottom of the drain pan 20b .

Further, at the bottom of the water storage tank 21, water supply means for spraying the condensed water stored in the water storage tank 21 as defrosting water for the return air side heat exchanger 12 to the return air side heat exchanger 12. 24 is provided. The water supply means 24 has a watering nozzle 27 provided with a watering nozzle 25 at the tip and a normally closed type opening / closing control valve 26 at the middle, and the other end of the watering pipe 27 is connected to the bottom of the water storage tank 21. Is connected to. When the normally closed opening / closing control valve 26 is opened, water in the water storage tank 21 passes through the water spray nozzle 25 and water is sprinkled around the return air side heat exchanger 12 only during the opening operation. The dewatering process around the return air side heat exchanger 12 can be performed with the supplied water. The surplus water here is received by the drain pan 20b and discarded.

  In FIG. 1, reference numerals 17a and 17b denote an expansion valve for the supply air side heat exchanger 9 and an expansion valve for the return air side heat exchanger 12, respectively, and 18a and 18b denote supply air side heat exchangers, respectively. 9 check valve and return air side heat exchanger 12 check valve. Reference numerals 19a and 19b denote a temperature sensing cylinder for the supply-side heat exchanger 9 and a temperature sensing cylinder for the return air-side heat exchanger 12, which control the expansion valves 17a and 17b, respectively.

  Next, operation | movement of the heat pump type air conditioning apparatus comprised in this way is demonstrated. First, at the time of heating operation, as indicated by broken line arrows in FIG. 1, the refrigerant from the compressor 14 is sent to the supply side heat exchanger 9 via the four-way valve 15 and flows through the supply passage 4. It condenses by heat exchange with air and heats the air in the supply side flow path 4. The condensed refrigerant is sent to the return air side heat exchanger 12, evaporated by the return air side heat exchanger 12, and deprived of heat of the air passing through the return air flow path 7. The accumulator 16 separates the gas and liquid and returns to the compressor 14. In addition, the air heated with the air supply side heat exchanger 9 is sent to an air-conditioned room.

  On the other hand, during the cooling operation, as indicated by a solid line arrow in FIG. 1, the refrigerant from the compressor 14 is sent to the return air side heat exchanger 12 through the four-way valve 15 and flows through the return air flow path 7. It is condensed by heat exchange with air. Further, the condensed refrigerant is sent to the supply side heat exchanger 9, and the air evaporated in the supply side heat exchanger 9 and flowing through the supply passage 4 is cooled and sent to the accumulator 16. The accumulator 16 separates the gas and liquid and returns to the compressor 14. In addition, the air cooled with the air supply side heat exchanger 9 is sent to an air-conditioned room.

Further, during the cooling operation, the condensed water generated in the supply side heat exchanger 9 on the supply passage 4 side and the excess water generated in the humidifier 10 are supplied from the drain pan 20a to the water storage tank 21. On the other hand, on the return air flow path 7 side, frost formation around the return air side heat exchanger 12 is monitored by the defrost sensor 23, and when frost formation is detected by a signal from the defrost sensor 23, the compressor 14 and the blowers 11 and 13 are stopped. At the same time, the opening / closing control valve 26 is opened, and the water in the water storage tank 21 passes through the water spray pipe 27 from the water spray nozzle 25 to the return air side heat exchanger 12. The defrosting process is performed by forcibly melting the frost with the water supplied and spraying the frost. When it is confirmed by the signal from the defrost sensor 23 that the defrosting process has been completed, the opening / closing control valve 26 is closed, and at the same time, the operation of the compressor 14 and the fans 11 and 13 is started again.

  The time for performing the defrosting process is not based on the signal from the defrosting sensor 23, but when the predetermined time has elapsed using a timer, the open / close control valve 26 is closed to end the defrosting process. May be. Alternatively, a timer may be used without providing the defrost sensor 23, and when the predetermined operating time is reached, the defrosting process may be performed by opening the open / close control valve 26 for a certain period of time.

Therefore, according to the heat pump type air conditioner of this embodiment, during cooling operation, water from the water storage tank 21 is supplied around the return air side heat exchanger 12, and the condensation pressure of the return air side heat exchanger 12 is increased. Reduce. Further, during the heating operation, the frost generated in the heat exchanger 12 on the return air side is melted with water to forcibly defrost, so that the defrosting process can be completed quickly in a short time. . In addition, since the defrosting can be performed without operating the compressor 14 and the blowers 11 and 13 without flowing cool air into the air-conditioned room, the power consumption can be reduced. In addition, rapid and stable defrosting can be performed without being affected by the ambient air temperature.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

The system diagram which shows the structure of the heat pump type air conditioning apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casing 2 Outside air inlet 3 Air inlet 4 Supply air flow path 5 Return air outlet 6 Exhaust outlet 7 Return air flow path 8 Partition plate 9 Supply side heat exchanger 10 Humidifier 11 Blower 12 Return air side heat exchanger 13 Blower 14 Compression Machine 15 Four-way selector valve 16 Accumulator 20a Drain pan 20b Drain pan 21 Reservoir 22a Drain hose 22b Drain hose 23 Defrost sensor 24 Water supply means 25 Water spray nozzle 26 Open / close control valve 27 Water spray pipe

Claims (5)

In the casing, an air supply passage extending from an outside air inlet to an air supply port to which an air supply duct of the air-conditioned room is connected, and a return air port connected to the return air duct from the air-conditioned room to an external exhaust port And a refrigerant from a compressor is supplied to the return air side with respect to the supply side heat exchanger provided in the supply air flow path and the return air side heat exchanger provided in the return air flow path. In a heat pump air conditioner configured to switch between a cooling operation and a heating operation for the air-conditioned room by circulating in the order of the heat exchanger and the air supply side heat exchanger, or vice versa,
A drain pan provided below the air supply side heat exchanger, a water storage tank for storing water, and water stored in the water storage tank are supplied around the return air side heat exchanger during cooling operation to supply the return air A heat pump type air conditioner comprising water supply means for removing frost generated in a side heat exchanger.   The drain pan and the water storage tank are connected by a pipe that feeds the drain water collected by the drain pan to the water storage tank, and the water supply means controls the water supply to the return air side heat exchanger. The heat pump type air conditioner according to claim 1, further comprising a control valve.   The water supply means includes a defrost sensor that detects a frost state of the return air side heat exchanger, and the open / close control valve opens in response to a frost detection signal of the defrost sensor. The heat pump type air conditioner according to claim 2.   3. The heat pump air conditioner according to claim 2, wherein the water supply means includes a timer, and the open / close control valve opens at every time set in the timer.   The heat pump type air conditioner according to claim 1, 2, 3, or 4, wherein the water supply means has a watering nozzle for spraying water around the return air side heat exchanger.

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